diff --git a/.gitignore b/.gitignore
index 6f09e53..5f392a9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,6 @@ toolchain/build/
 toolchain/src/
 programs/bin/
 programs/obj/
-programs/src/doom/obj/
+programs/src/*/obj/
+programs/lib/libc/liblibc.a
 programs/gui/icons/
-programs/src/desktop/obj/
diff --git a/kernel/src/Api/Syscall.cpp b/kernel/src/Api/Syscall.cpp
index 73df553..15012f3 100644
--- a/kernel/src/Api/Syscall.cpp
+++ b/kernel/src/Api/Syscall.cpp
@@ -29,6 +29,12 @@
 #include <Hal/GDT.hpp>
 #include <Graphics/Cursor.hpp>
 #include "../Libraries/flanterm/src/flanterm.h"
+#include "WinServer.hpp"
+#include <Pci/Pci.hpp>
+#include <Drivers/USB/Xhci.hpp>
+#include <Drivers/Graphics/IntelGPU.hpp>
+#include <Drivers/PS2/PS2Controller.hpp>
+#include <Hal/Apic/ApicInit.hpp>
 
 // Assembly entry point
 extern "C" void SyscallEntry();
@@ -605,6 +611,228 @@ namespace Zenith {
         return 0;
     }
 
+    // ---- Process listing / kill ----
+
+    static int Sys_ProcList(ProcInfo* buf, int maxCount) {
+        if (buf == nullptr || maxCount <= 0) return 0;
+        int count = 0;
+        for (int i = 0; i < Sched::MaxProcesses && count < maxCount; i++) {
+            auto* proc = Sched::GetProcessSlot(i);
+            if (!proc || proc->state == Sched::ProcessState::Free) continue;
+
+            buf[count].pid = (int32_t)proc->pid;
+            buf[count].parentPid = (int32_t)proc->parentPid;
+            buf[count].state = (uint8_t)proc->state;
+            buf[count]._pad[0] = 0;
+            buf[count]._pad[1] = 0;
+            buf[count]._pad[2] = 0;
+            {
+                int j = 0;
+                for (; j < 63 && proc->name[j]; j++)
+                    buf[count].name[j] = proc->name[j];
+                buf[count].name[j] = '\0';
+            }
+            buf[count].heapUsed = (proc->heapNext > Sched::UserHeapBase)
+                ? proc->heapNext - Sched::UserHeapBase : 0;
+            count++;
+        }
+        return count;
+    }
+
+    static int Sys_Kill(int pid) {
+        // Refuse to kill PID 0 (init)
+        if (pid == 0) return -1;
+        // Refuse to kill the caller's own process
+        if (pid == Sched::GetCurrentPid()) return -1;
+
+        auto* proc = Sched::GetProcessByPid(pid);
+        if (!proc) return -1;
+
+        // Clean up any windows owned by this process
+        WinServer::CleanupProcess(pid);
+
+        proc->state = Sched::ProcessState::Terminated;
+        return 0;
+    }
+
+    // ---- Device list ----
+
+    static void dl_strcpy(char* dst, const char* src, int max) {
+        int i = 0;
+        for (; i < max - 1 && src[i]; i++) dst[i] = src[i];
+        dst[i] = '\0';
+    }
+
+    static int dl_append(char* dst, int pos, const char* src, int max) {
+        for (int i = 0; src[i] && pos < max - 1; i++) dst[pos++] = src[i];
+        dst[pos] = '\0';
+        return pos;
+    }
+
+    static int dl_append_hex(char* dst, int pos, unsigned val, int digits, int max) {
+        const char* hex = "0123456789abcdef";
+        char tmp[8];
+        for (int i = digits - 1; i >= 0; i--) { tmp[i] = hex[val & 0xF]; val >>= 4; }
+        for (int i = 0; i < digits && pos < max - 1; i++) dst[pos++] = tmp[i];
+        dst[pos] = '\0';
+        return pos;
+    }
+
+    static int dl_append_dec(char* dst, int pos, int val, int max) {
+        if (val == 0) { if (pos < max - 1) dst[pos++] = '0'; dst[pos] = '\0'; return pos; }
+        char tmp[12]; int i = 0;
+        while (val > 0) { tmp[i++] = '0' + (val % 10); val /= 10; }
+        while (i > 0 && pos < max - 1) dst[pos++] = tmp[--i];
+        dst[pos] = '\0';
+        return pos;
+    }
+
+    static int Sys_DevList(DevInfo* buf, int maxCount) {
+        if (buf == nullptr || maxCount <= 0) return 0;
+        int count = 0;
+
+        auto add = [&](uint8_t cat, const char* name, const char* detail) {
+            if (count >= maxCount) return;
+            buf[count].category = cat;
+            buf[count]._pad[0] = 0; buf[count]._pad[1] = 0; buf[count]._pad[2] = 0;
+            dl_strcpy(buf[count].name, name, 48);
+            dl_strcpy(buf[count].detail, detail, 48);
+            count++;
+        };
+
+        // CPU cores (category 0)
+        int cpuCount = Hal::GetDetectedCpuCount();
+        if (cpuCount > 0) {
+            char detail[48];
+            int p = 0;
+            p = dl_append(detail, p, "x86_64, ", 48);
+            p = dl_append_dec(detail, p, cpuCount, 48);
+            p = dl_append(detail, p, " core(s)", 48);
+            add(0, "Processor", detail);
+        }
+
+        // Interrupt controllers (category 1)
+        add(1, "Local APIC", "Per-CPU interrupt controller");
+        add(1, "I/O APIC", "System interrupt router");
+
+        // Timer (category 2)
+        add(2, "LAPIC Timer", "Local APIC periodic timer");
+
+        // PS/2 Input (category 3)
+        add(3, "PS/2 Keyboard", "IRQ 1, scan code set 1");
+        if (Drivers::PS2::IsDualChannel()) {
+            add(3, "PS/2 Mouse", "IRQ 12, dual-channel 8042");
+        }
+
+        // USB devices (category 4)
+        if (Drivers::USB::Xhci::IsInitialized()) {
+            for (uint8_t slot = 1; slot <= Drivers::USB::Xhci::MAX_SLOTS && count < maxCount; slot++) {
+                auto* dev = Drivers::USB::Xhci::GetDevice(slot);
+                if (!dev || !dev->Active) continue;
+                const char* devName = "USB Device";
+                if (dev->InterfaceClass == 3) {
+                    if (dev->InterfaceProtocol == 1) devName = "USB HID Keyboard";
+                    else if (dev->InterfaceProtocol == 2) devName = "USB HID Mouse";
+                    else devName = "USB HID Device";
+                } else if (dev->InterfaceClass == 8) {
+                    devName = "USB Mass Storage";
+                } else if (dev->InterfaceClass == 9) {
+                    devName = "USB Hub";
+                }
+                char detail[48];
+                int p = 0;
+                p = dl_append(detail, p, "Port ", 48);
+                p = dl_append_dec(detail, p, dev->PortId, 48);
+                p = dl_append(detail, p, ", VID:", 48);
+                p = dl_append_hex(detail, p, dev->VendorId, 4, 48);
+                p = dl_append(detail, p, " PID:", 48);
+                p = dl_append_hex(detail, p, dev->ProductId, 4, 48);
+                add(4, devName, detail);
+            }
+        }
+
+        // Network (category 5)
+        if (Drivers::Net::E1000::IsInitialized()) {
+            add(5, "Intel E1000", "Gigabit Ethernet (82540EM)");
+        }
+        if (Drivers::Net::E1000E::IsInitialized()) {
+            add(5, "Intel E1000E", "Gigabit Ethernet (82574L)");
+        }
+
+        // Display (category 6)
+        if (Drivers::Graphics::IntelGPU::IsInitialized()) {
+            auto* gpu = Drivers::Graphics::IntelGPU::GetGpuInfo();
+            if (gpu) {
+                add(6, gpu->name, "Intel Integrated Graphics");
+            }
+        }
+
+        // PCI devices (category 7)
+        auto& pciDevs = Pci::GetDevices();
+        for (int i = 0; i < (int)pciDevs.size() && count < maxCount; i++) {
+            auto& d = pciDevs[i];
+            const char* className = Pci::GetClassName(d.ClassCode, d.SubClass);
+            char detail[48];
+            int p = 0;
+            p = dl_append_hex(detail, p, d.Bus, 2, 48);
+            p = dl_append(detail, p, ":", 48);
+            p = dl_append_hex(detail, p, d.Device, 2, 48);
+            p = dl_append(detail, p, ".", 48);
+            p = dl_append_dec(detail, p, d.Function, 48);
+            p = dl_append(detail, p, " ", 48);
+            p = dl_append_hex(detail, p, d.VendorId, 4, 48);
+            p = dl_append(detail, p, ":", 48);
+            p = dl_append_hex(detail, p, d.DeviceId, 4, 48);
+            add(7, className, detail);
+        }
+
+        return count;
+    }
+
+    // ---- Window server syscalls ----
+
+    static int Sys_WinCreate(const char* title, int w, int h, WinCreateResult* result) {
+        if (result == nullptr || title == nullptr) return -1;
+        auto* proc = Sched::GetCurrentProcessPtr();
+        if (proc == nullptr) return -1;
+
+        uint64_t outVa = 0;
+        int id = WinServer::Create(proc->pid, proc->pml4Phys, title, w, h,
+                                   proc->heapNext, outVa);
+        result->id = id;
+        result->pixelVa = (id >= 0) ? outVa : 0;
+        return id >= 0 ? 0 : -1;
+    }
+
+    static int Sys_WinDestroy(int windowId) {
+        return WinServer::Destroy(windowId, Sched::GetCurrentPid());
+    }
+
+    static int Sys_WinPresent(int windowId) {
+        return WinServer::Present(windowId, Sched::GetCurrentPid());
+    }
+
+    static int Sys_WinPoll(int windowId, WinEvent* outEvent) {
+        if (outEvent == nullptr) return -1;
+        return WinServer::Poll(windowId, Sched::GetCurrentPid(), outEvent);
+    }
+
+    static int Sys_WinEnum(WinInfo* outArray, int maxCount) {
+        if (outArray == nullptr || maxCount <= 0) return 0;
+        return WinServer::Enumerate(outArray, maxCount);
+    }
+
+    static uint64_t Sys_WinMap(int windowId) {
+        auto* proc = Sched::GetCurrentProcessPtr();
+        if (proc == nullptr) return 0;
+        return WinServer::Map(windowId, proc->pid, proc->pml4Phys, proc->heapNext);
+    }
+
+    static int Sys_WinSendEvent(int windowId, const WinEvent* event) {
+        if (event == nullptr) return -1;
+        return WinServer::SendEvent(windowId, event);
+    }
+
     // ---- Dispatch ----
 
     extern "C" int64_t SyscallDispatch(SyscallFrame* frame) {
@@ -743,6 +971,27 @@ namespace Zenith {
                 return (int64_t)Sys_ChildIoWriteKey((int)frame->arg1, (const KeyEvent*)frame->arg2);
             case SYS_CHILDIO_SETTERMSZ:
                 return (int64_t)Sys_ChildIoSetTermsz((int)frame->arg1, (int)frame->arg2, (int)frame->arg3);
+            case SYS_WINCREATE:
+                return (int64_t)Sys_WinCreate((const char*)frame->arg1, (int)frame->arg2,
+                                              (int)frame->arg3, (WinCreateResult*)frame->arg4);
+            case SYS_WINDESTROY:
+                return (int64_t)Sys_WinDestroy((int)frame->arg1);
+            case SYS_WINPRESENT:
+                return (int64_t)Sys_WinPresent((int)frame->arg1);
+            case SYS_WINPOLL:
+                return (int64_t)Sys_WinPoll((int)frame->arg1, (WinEvent*)frame->arg2);
+            case SYS_WINENUM:
+                return (int64_t)Sys_WinEnum((WinInfo*)frame->arg1, (int)frame->arg2);
+            case SYS_WINMAP:
+                return (int64_t)Sys_WinMap((int)frame->arg1);
+            case SYS_WINSENDEVENT:
+                return (int64_t)Sys_WinSendEvent((int)frame->arg1, (const WinEvent*)frame->arg2);
+            case SYS_PROCLIST:
+                return (int64_t)Sys_ProcList((ProcInfo*)frame->arg1, (int)frame->arg2);
+            case SYS_KILL:
+                return (int64_t)Sys_Kill((int)frame->arg1);
+            case SYS_DEVLIST:
+                return (int64_t)Sys_DevList((DevInfo*)frame->arg1, (int)frame->arg2);
             default:
                 return -1;
         }
@@ -769,7 +1018,7 @@ namespace Zenith {
         Hal::WriteMSR(Hal::IA32_FMASK, 0x200);
 
         Kt::KernelLogStream(Kt::OK, "Syscall") << "SYSCALL/SYSRET initialized (LSTAR="
-            << kcp::hex << (uint64_t)SyscallEntry << kcp::dec << ", 53 syscalls)";
+            << kcp::hex << (uint64_t)SyscallEntry << kcp::dec << ", 64 syscalls)";
     }
 
 }
diff --git a/kernel/src/Api/Syscall.hpp b/kernel/src/Api/Syscall.hpp
index 13e9026..17eea57 100644
--- a/kernel/src/Api/Syscall.hpp
+++ b/kernel/src/Api/Syscall.hpp
@@ -66,6 +66,20 @@ namespace Zenith {
     static constexpr uint64_t SYS_CHILDIO_WRITEKEY = 52;
     static constexpr uint64_t SYS_CHILDIO_SETTERMSZ = 53;
 
+    // Window server syscalls
+    static constexpr uint64_t SYS_WINCREATE    = 54;
+    static constexpr uint64_t SYS_WINDESTROY   = 55;
+    static constexpr uint64_t SYS_WINPRESENT   = 56;
+    static constexpr uint64_t SYS_WINPOLL      = 57;
+    static constexpr uint64_t SYS_WINENUM      = 58;
+    static constexpr uint64_t SYS_WINMAP       = 59;
+    static constexpr uint64_t SYS_WINSENDEVENT = 60;
+
+    // Process management syscalls
+    static constexpr uint64_t SYS_PROCLIST    = 61;
+    static constexpr uint64_t SYS_KILL        = 62;
+    static constexpr uint64_t SYS_DEVLIST     = 63;
+
     static constexpr int SOCK_TCP = 1;
     static constexpr int SOCK_UDP = 2;
 
@@ -118,6 +132,48 @@ namespace Zenith {
         uint8_t  buttons;
     };
 
+    // Window server shared types
+    struct WinEvent {
+        uint8_t type;     // 0=key, 1=mouse, 2=resize, 3=close
+        uint8_t _pad[3];
+        union {
+            KeyEvent key;
+            struct { int32_t x, y, scroll; uint8_t buttons, prev_buttons; } mouse;
+            struct { int32_t w, h; } resize;
+        };
+    };
+
+    struct WinInfo {
+        int32_t  id;
+        int32_t  ownerPid;
+        char     title[64];
+        int32_t  width, height;
+        uint8_t  dirty;
+        uint8_t  _pad[3];
+    };
+
+    struct WinCreateResult {
+        int32_t  id;       // -1 on failure
+        uint32_t _pad;
+        uint64_t pixelVa;  // VA of pixel buffer in caller's address space
+    };
+
+    struct DevInfo {
+        uint8_t  category;     // 0=CPU, 1=Interrupt, 2=Timer, 3=Input, 4=USB, 5=Network, 6=Display, 7=PCI
+        uint8_t  _pad[3];
+        char     name[48];
+        char     detail[48];
+    };
+
+    struct ProcInfo {
+        int32_t  pid;
+        int32_t  parentPid;
+        uint8_t  state;        // 0=Free, 1=Ready, 2=Running, 3=Terminated
+        uint8_t  _pad[3];
+        char     name[64];
+        uint64_t heapUsed;     // heapNext - UserHeapBase (bytes)
+    };
+
     // Stack frame pushed by SyscallEntry.asm
     struct SyscallFrame {
         uint64_t r15, r14, r13, r12, rbp, rbx;   // callee-saved
diff --git a/kernel/src/Api/WinServer.cpp b/kernel/src/Api/WinServer.cpp
new file mode 100644
index 0000000..21800ce
--- /dev/null
+++ b/kernel/src/Api/WinServer.cpp
@@ -0,0 +1,175 @@
+/*
+    * WinServer.cpp
+    * Window server kernel implementation for external process windows
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include "WinServer.hpp"
+#include <Memory/PageFrameAllocator.hpp>
+#include <Memory/Paging.hpp>
+#include <Memory/HHDM.hpp>
+#include <Libraries/Memory.hpp>
+#include <Terminal/Terminal.hpp>
+
+namespace WinServer {
+
+    static WindowSlot g_slots[MaxWindows];
+
+    int Create(int ownerPid, uint64_t ownerPml4, const char* title, int w, int h,
+               uint64_t& heapNext, uint64_t& outVa) {
+        // Find a free slot
+        int slotIdx = -1;
+        for (int i = 0; i < MaxWindows; i++) {
+            if (!g_slots[i].used) {
+                slotIdx = i;
+                break;
+            }
+        }
+        if (slotIdx < 0) return -1;
+
+        // Validate dimensions
+        if (w <= 0 || h <= 0) return -1;
+        uint64_t bufSize = (uint64_t)w * h * 4;
+        int numPages = (int)((bufSize + 0xFFF) / 0x1000);
+        if (numPages > MaxPixelPages) return -1;
+
+        WindowSlot& slot = g_slots[slotIdx];
+        memset(&slot, 0, sizeof(WindowSlot));
+        slot.used = true;
+        slot.ownerPid = ownerPid;
+        slot.width = w;
+        slot.height = h;
+        slot.pixelNumPages = numPages;
+        slot.eventHead = 0;
+        slot.eventTail = 0;
+        slot.dirty = false;
+        slot.desktopVa = 0;
+        slot.desktopPid = 0;
+
+        // Copy title
+        int tlen = 0;
+        while (title[tlen] && tlen < 63) {
+            slot.title[tlen] = title[tlen];
+            tlen++;
+        }
+        slot.title[tlen] = '\0';
+
+        // Allocate physical pages and map into owner's address space
+        uint64_t userVa = heapNext;
+        for (int i = 0; i < numPages; i++) {
+            void* page = Memory::g_pfa->AllocateZeroed();
+            if (page == nullptr) {
+                // Cleanup on failure - mark slot unused
+                slot.used = false;
+                return -1;
+            }
+            uint64_t physAddr = Memory::SubHHDM((uint64_t)page);
+            slot.pixelPhysPages[i] = physAddr;
+            Memory::VMM::Paging::MapUserIn(ownerPml4, physAddr, userVa + (uint64_t)i * 0x1000);
+        }
+
+        slot.ownerVa = userVa;
+        heapNext += (uint64_t)numPages * 0x1000;
+        outVa = userVa;
+
+        Kt::KernelLogStream(Kt::OK, "WinServer") << "Created window " << slotIdx
+            << " (" << w << "x" << h << ") for PID " << ownerPid;
+
+        return slotIdx;
+    }
+
+    int Destroy(int windowId, int callerPid) {
+        if (windowId < 0 || windowId >= MaxWindows) return -1;
+        WindowSlot& slot = g_slots[windowId];
+        if (!slot.used || slot.ownerPid != callerPid) return -1;
+
+        slot.used = false;
+        return 0;
+    }
+
+    int Present(int windowId, int callerPid) {
+        if (windowId < 0 || windowId >= MaxWindows) return -1;
+        WindowSlot& slot = g_slots[windowId];
+        if (!slot.used || slot.ownerPid != callerPid) return -1;
+
+        slot.dirty = true;
+        return 0;
+    }
+
+    int Poll(int windowId, int callerPid, Zenith::WinEvent* outEvent) {
+        if (windowId < 0 || windowId >= MaxWindows) return -1;
+        WindowSlot& slot = g_slots[windowId];
+        if (!slot.used || slot.ownerPid != callerPid) return -1;
+
+        if (slot.eventHead == slot.eventTail) return 0; // no events
+
+        *outEvent = slot.events[slot.eventTail];
+        slot.eventTail = (slot.eventTail + 1) % MaxEvents;
+        return 1;
+    }
+
+    int Enumerate(Zenith::WinInfo* outArray, int maxCount) {
+        int count = 0;
+        for (int i = 0; i < MaxWindows && count < maxCount; i++) {
+            if (!g_slots[i].used) continue;
+            Zenith::WinInfo& info = outArray[count];
+            info.id = i;
+            info.ownerPid = g_slots[i].ownerPid;
+            for (int j = 0; j < 64; j++) info.title[j] = g_slots[i].title[j];
+            info.width = g_slots[i].width;
+            info.height = g_slots[i].height;
+            info.dirty = g_slots[i].dirty ? 1 : 0;
+            g_slots[i].dirty = false; // clear dirty after read
+            count++;
+        }
+        return count;
+    }
+
+    uint64_t Map(int windowId, int callerPid, uint64_t callerPml4, uint64_t& heapNext) {
+        if (windowId < 0 || windowId >= MaxWindows) return 0;
+        WindowSlot& slot = g_slots[windowId];
+        if (!slot.used) return 0;
+
+        // If already mapped into this process, return existing VA
+        if (slot.desktopPid == callerPid && slot.desktopVa != 0) {
+            return slot.desktopVa;
+        }
+
+        uint64_t userVa = heapNext;
+
+        for (int i = 0; i < slot.pixelNumPages; i++) {
+            Memory::VMM::Paging::MapUserIn(callerPml4, slot.pixelPhysPages[i],
+                                           userVa + (uint64_t)i * 0x1000);
+        }
+
+        slot.desktopVa = userVa;
+        slot.desktopPid = callerPid;
+        heapNext += (uint64_t)slot.pixelNumPages * 0x1000;
+
+        return userVa;
+    }
+
+    int SendEvent(int windowId, const Zenith::WinEvent* event) {
+        if (windowId < 0 || windowId >= MaxWindows) return -1;
+        WindowSlot& slot = g_slots[windowId];
+        if (!slot.used) return -1;
+
+        int nextHead = (slot.eventHead + 1) % MaxEvents;
+        if (nextHead == slot.eventTail) return -1; // queue full, drop event
+
+        slot.events[slot.eventHead] = *event;
+        slot.eventHead = nextHead;
+        return 0;
+    }
+
+    void CleanupProcess(int pid) {
+        for (int i = 0; i < MaxWindows; i++) {
+            if (g_slots[i].used && g_slots[i].ownerPid == pid) {
+                Kt::KernelLogStream(Kt::INFO, "WinServer") << "Cleaning up window "
+                    << i << " for exited PID " << pid;
+                g_slots[i].used = false;
+            }
+        }
+    }
+
+}
diff --git a/kernel/src/Api/WinServer.hpp b/kernel/src/Api/WinServer.hpp
new file mode 100644
index 0000000..53fd63f
--- /dev/null
+++ b/kernel/src/Api/WinServer.hpp
@@ -0,0 +1,42 @@
+/*
+    * WinServer.hpp
+    * Window server kernel state for external process windows
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#pragma once
+#include "Syscall.hpp"
+#include <cstdint>
+
+namespace WinServer {
+
+    static constexpr int MaxWindows = 8;
+    static constexpr int MaxEvents = 64;
+    static constexpr int MaxPixelPages = 2048; // up to 2048x1024 @ 32bpp = 8MB
+
+    struct WindowSlot {
+        bool used;
+        int ownerPid;
+        char title[64];
+        int width, height;
+        uint64_t pixelPhysPages[MaxPixelPages];
+        int pixelNumPages;
+        uint64_t ownerVa;      // VA in owner's address space
+        uint64_t desktopVa;    // VA in desktop's address space (0 = not yet mapped)
+        int desktopPid;        // PID of the process that mapped it
+        Zenith::WinEvent events[MaxEvents];
+        int eventHead, eventTail;
+        bool dirty;
+    };
+
+    int Create(int ownerPid, uint64_t ownerPml4, const char* title, int w, int h,
+               uint64_t& heapNext, uint64_t& outVa);
+    int Destroy(int windowId, int callerPid);
+    int Present(int windowId, int callerPid);
+    int Poll(int windowId, int callerPid, Zenith::WinEvent* outEvent);
+    int Enumerate(Zenith::WinInfo* outArray, int maxCount);
+    uint64_t Map(int windowId, int callerPid, uint64_t callerPml4, uint64_t& heapNext);
+    int SendEvent(int windowId, const Zenith::WinEvent* event);
+    void CleanupProcess(int pid);
+
+}
diff --git a/kernel/src/Drivers/USB/UsbDevice.cpp b/kernel/src/Drivers/USB/UsbDevice.cpp
index 73f8373..b811b71 100644
--- a/kernel/src/Drivers/USB/UsbDevice.cpp
+++ b/kernel/src/Drivers/USB/UsbDevice.cpp
@@ -461,9 +461,11 @@ namespace Drivers::USB::UsbDevice {
         }
 
         // -----------------------------------------------------------------
-        // Step 10: SET_PROTOCOL(0) -- request Boot Protocol
+        // Step 10: SET_PROTOCOL -- Boot Protocol for keyboards only
         // -----------------------------------------------------------------
-        if (foundEp) {
+        // Boot Protocol constrains mice to 3-byte reports (no scroll wheel).
+        // Keep mice in Report Protocol (the default) so scroll data is included.
+        if (foundEp && dev->InterfaceProtocol == PROTOCOL_KEYBOARD) {
             cc = Xhci::ControlTransfer(slotId, REQTYPE_CLASS_IFACE, REQ_SET_PROTOCOL,
                                        0, 0, 0, nullptr, false);
             if (cc != Xhci::CC_SUCCESS) {
@@ -475,7 +477,7 @@ namespace Drivers::USB::UsbDevice {
         // -----------------------------------------------------------------
         // Step 11: SET_IDLE(4) -- 16ms idle rate for software typematic
         // -----------------------------------------------------------------
-        if (foundEp) {
+        if (foundEp && dev->InterfaceProtocol == PROTOCOL_KEYBOARD) {
             // wValue upper byte = duration in 4ms units, lower byte = report ID
             cc = Xhci::ControlTransfer(slotId, REQTYPE_CLASS_IFACE, REQ_SET_IDLE,
                                        (4 << 8), 0, 0, nullptr, false);
diff --git a/kernel/src/Hal/Apic/ApicInit.cpp b/kernel/src/Hal/Apic/ApicInit.cpp
index f5d7ebe..1929249 100644
--- a/kernel/src/Hal/Apic/ApicInit.cpp
+++ b/kernel/src/Hal/Apic/ApicInit.cpp
@@ -19,6 +19,10 @@
 using namespace Kt;
 
 namespace Hal {
+    static int g_detectedCpuCount = 0;
+
+    int GetDetectedCpuCount() { return g_detectedCpuCount; }
+
     void ApicInitialize(ACPI::CommonSDTHeader* xsdt) {
         KernelLogStream(INFO, "APIC") << "Initializing APIC subsystem";
 
@@ -29,6 +33,8 @@ namespace Hal {
             return;
         }
 
+        g_detectedCpuCount = madt.LocalApicCount;
+
         if (madt.IoApicAddress == 0) {
             KernelLogStream(ERROR, "APIC") << "No IOAPIC found in MADT";
             return;
diff --git a/kernel/src/Hal/Apic/ApicInit.hpp b/kernel/src/Hal/Apic/ApicInit.hpp
index 3d4ea38..a3122c7 100644
--- a/kernel/src/Hal/Apic/ApicInit.hpp
+++ b/kernel/src/Hal/Apic/ApicInit.hpp
@@ -19,4 +19,7 @@ namespace Hal {
     //
     // xsdt: pointer to the XSDT (already HHDM-mapped)
     void ApicInitialize(ACPI::CommonSDTHeader* xsdt);
+
+    // Number of CPU cores detected via MADT (available after ApicInitialize)
+    int GetDetectedCpuCount();
 };
diff --git a/kernel/src/Sched/Context.asm b/kernel/src/Sched/Context.asm
index 56bdfe7..b86d00e 100644
--- a/kernel/src/Sched/Context.asm
+++ b/kernel/src/Sched/Context.asm
@@ -1,18 +1,30 @@
 ;
 ;   Context.asm
-;   Context switch: save/restore callee-saved registers, stack pointer, and CR3
+;   Context switch: save/restore callee-saved registers, stack pointer, CR3, and FPU state
 ;   Copyright (c) 2025 Daniel Hammer
 ;
 
 [bits 64]
 section .text
 
-; void SchedContextSwitch(uint64_t* oldRsp, uint64_t newRsp, uint64_t newCR3)
+; void SchedContextSwitch(uint64_t* oldRsp, uint64_t newRsp, uint64_t newCR3,
+;                         uint8_t* oldFpuArea, uint8_t* newFpuArea)
 ;   rdi = pointer to save old RSP
 ;   rsi = new RSP to restore
 ;   rdx = new PML4 physical address (for CR3)
+;   rcx = old FPU state area (may be null)
+;   r8  = new FPU state area (may be null)
 global SchedContextSwitch
 SchedContextSwitch:
+    ; Save FPU state before pushing registers (rcx/r8 are caller-saved)
+    test rcx, rcx
+    jz .skip_fxsave
+    fxsave [rcx]
+.skip_fxsave:
+
+    ; Stash r8 in r9 (callee-saved registers will clobber r8 slot on stack)
+    mov r9, r8
+
     ; Save callee-saved registers on the current stack
     push rbp
     push rbx
@@ -42,4 +54,10 @@ SchedContextSwitch:
     pop rbx
     pop rbp
 
+    ; Restore FPU state
+    test r9, r9
+    jz .skip_fxrstor
+    fxrstor [r9]
+.skip_fxrstor:
+
     ret
diff --git a/kernel/src/Sched/Scheduler.cpp b/kernel/src/Sched/Scheduler.cpp
index 7b2de94..a7574a7 100644
--- a/kernel/src/Sched/Scheduler.cpp
+++ b/kernel/src/Sched/Scheduler.cpp
@@ -14,9 +14,11 @@
 #include <CppLib/Stream.hpp>
 #include <Hal/Apic/Apic.hpp>
 #include <Hal/GDT.hpp>
+#include <Api/WinServer.hpp>
 
-// Assembly: context switch with CR3 parameter
-extern "C" void SchedContextSwitch(uint64_t* oldRsp, uint64_t newRsp, uint64_t newCR3);
+// Assembly: context switch with CR3 and FPU state parameters
+extern "C" void SchedContextSwitch(uint64_t* oldRsp, uint64_t newRsp, uint64_t newCR3,
+                                   uint8_t* oldFpuArea, uint8_t* newFpuArea);
 
 // Assembly: jump to user mode via IRETQ
 extern "C" void JumpToUserMode(uint64_t rip, uint64_t rsp);
@@ -66,7 +68,7 @@ namespace Sched {
         for (int i = 0; i < MaxProcesses; i++) {
             processTable[i].pid = i;
             processTable[i].state = ProcessState::Free;
-            processTable[i].name = nullptr;
+            processTable[i].name[0] = '\0';
             processTable[i].savedRsp = 0;
             processTable[i].stackBase = 0;
             processTable[i].entryPoint = 0;
@@ -191,7 +193,11 @@ namespace Sched {
         Process& proc = processTable[slot];
         proc.pid = nextPid++;
         proc.state = ProcessState::Ready;
-        proc.name = vfsPath;
+        {
+            int i = 0;
+            for (; i < 63 && vfsPath[i]; i++) proc.name[i] = vfsPath[i];
+            proc.name[i] = '\0';
+        }
         proc.savedRsp = (uint64_t)sp;
         proc.stackBase = (uint64_t)kernelStackBase;
         proc.entryPoint = entry;
@@ -224,6 +230,11 @@ namespace Sched {
         proc.termCols = 0;
         proc.termRows = 0;
 
+        // Initialize FPU state: zero out, then set default FCW and MXCSR
+        memset(proc.fpuState, 0, 512);
+        *(uint16_t*)&proc.fpuState[0] = 0x037F;   // FCW: default x87 control word
+        *(uint32_t*)&proc.fpuState[24] = 0x1F80;   // MXCSR: default SSE control/status
+
         return proc.pid;
     }
 
@@ -276,7 +287,9 @@ namespace Sched {
         // Update TSS RSP0 for hardware interrupts from ring 3
         Hal::g_tss.rsp0 = processTable[next].kernelStackTop;
 
-        SchedContextSwitch(oldRspPtr, processTable[next].savedRsp, newCR3);
+        uint8_t* oldFpu = (currentPid >= 0) ? processTable[currentPid].fpuState : nullptr;
+        uint8_t* newFpu = processTable[next].fpuState;
+        SchedContextSwitch(oldRspPtr, processTable[next].savedRsp, newCR3, oldFpu, newFpu);
     }
 
     void Tick() {
@@ -309,6 +322,9 @@ namespace Sched {
             return;
         }
 
+        // Clean up any windows owned by this process
+        WinServer::CleanupProcess(processTable[currentPid].pid);
+
         processTable[currentPid].state = ProcessState::Terminated;
 
         int next = -1;
@@ -329,11 +345,13 @@ namespace Sched {
             g_kernelRsp = processTable[next].kernelStackTop;
             Hal::g_tss.rsp0 = processTable[next].kernelStackTop;
 
-            SchedContextSwitch(&processTable[old].savedRsp, processTable[next].savedRsp, newCR3);
+            SchedContextSwitch(&processTable[old].savedRsp, processTable[next].savedRsp, newCR3,
+                              processTable[old].fpuState, processTable[next].fpuState);
         } else {
             int old = currentPid;
             currentPid = -1;
-            SchedContextSwitch(&processTable[old].savedRsp, idleSavedRsp, GetKernelCR3());
+            SchedContextSwitch(&processTable[old].savedRsp, idleSavedRsp, GetKernelCR3(),
+                              processTable[old].fpuState, nullptr);
         }
 
         for (;;) {
@@ -362,4 +380,9 @@ namespace Sched {
         return nullptr;
     }
 
+    Process* GetProcessSlot(int slot) {
+        if (slot < 0 || slot >= MaxProcesses) return nullptr;
+        return &processTable[slot];
+    }
+
 }
diff --git a/kernel/src/Sched/Scheduler.hpp b/kernel/src/Sched/Scheduler.hpp
index 04b35d9..218b870 100644
--- a/kernel/src/Sched/Scheduler.hpp
+++ b/kernel/src/Sched/Scheduler.hpp
@@ -30,7 +30,7 @@ namespace Sched {
     struct Process {
         int pid;
         ProcessState state;
-        const char* name;
+        char name[64];
         uint64_t savedRsp;
         uint64_t stackBase;       // Bottom of allocated kernel stack (lowest address)
         uint64_t entryPoint;
@@ -58,6 +58,9 @@ namespace Sched {
         // GUI terminal dimensions (set by desktop, read by SYS_TERMSIZE)
         int termCols = 0;
         int termRows = 0;
+
+        // FPU/SSE state (FXSAVE format, must be 16-byte aligned)
+        uint8_t fpuState[512] __attribute__((aligned(16)));
     };
 
     void Initialize();
@@ -82,4 +85,7 @@ namespace Sched {
     // Find a process by PID (returns nullptr if not found or not alive)
     Process* GetProcessByPid(int pid);
 
+    // Get a pointer to slot i in the process table (for enumeration)
+    Process* GetProcessSlot(int slot);
+
 }
diff --git a/programs/GNUmakefile b/programs/GNUmakefile
index 0d8ecc1..278d5b8 100644
--- a/programs/GNUmakefile
+++ b/programs/GNUmakefile
@@ -82,9 +82,9 @@ CA_CERTS := $(BINDIR)/etc/ca-certificates.crt
 # Home directory placeholder.
 HOMEKEEP := $(BINDIR)/home/.keep
 
-.PHONY: all clean doom fetch wiki desktop icons bearssl libc
+.PHONY: all clean doom fetch wiki desktop icons fonts bearssl libc
 
-all: bearssl libc $(TARGETS) fetch wiki doom desktop icons $(GAME_DATA) $(MANDST) $(WWWDST) $(CA_CERTS) $(HOMEKEEP)
+all: bearssl libc $(TARGETS) fetch wiki doom desktop icons fonts $(GAME_DATA) $(MANDST) $(WWWDST) $(CA_CERTS) $(HOMEKEEP)
 
 # Build BearSSL static library.
 bearssl:
@@ -110,6 +110,10 @@ desktop:
 icons:
 	../scripts/copy_icons.sh
 
+# Copy TTF fonts for the desktop into bin/fonts/.
+fonts:
+	../scripts/copy_fonts.sh
+
 # Build doom via its own Makefile.
 doom:
 	$(MAKE) -C src/doom
diff --git a/programs/gui/fonts/JetBrains_Mono/JetBrainsMono-Italic-VariableFont_wght.ttf b/programs/gui/fonts/JetBrains_Mono/JetBrainsMono-Italic-VariableFont_wght.ttf
new file mode 100644
index 0000000..ecb5f73
Binary files /dev/null and b/programs/gui/fonts/JetBrains_Mono/JetBrainsMono-Italic-VariableFont_wght.ttf differ
diff --git a/programs/gui/fonts/JetBrains_Mono/JetBrainsMono-VariableFont_wght.ttf b/programs/gui/fonts/JetBrains_Mono/JetBrainsMono-VariableFont_wght.ttf
new file mode 100644
index 0000000..4c96e79
Binary files /dev/null and b/programs/gui/fonts/JetBrains_Mono/JetBrainsMono-VariableFont_wght.ttf differ
diff --git a/programs/gui/fonts/JetBrains_Mono/OFL.txt b/programs/gui/fonts/JetBrains_Mono/OFL.txt
new file mode 100644
index 0000000..3f34847
--- /dev/null
+++ b/programs/gui/fonts/JetBrains_Mono/OFL.txt
@@ -0,0 +1,93 @@
+Copyright 2020 The JetBrains Mono Project Authors (https://github.com/JetBrains/JetBrainsMono)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
diff --git a/programs/gui/fonts/JetBrains_Mono/README.txt b/programs/gui/fonts/JetBrains_Mono/README.txt
new file mode 100644
index 0000000..534de33
--- /dev/null
+++ b/programs/gui/fonts/JetBrains_Mono/README.txt
@@ -0,0 +1,79 @@
+JetBrains Mono Variable Font
+============================
+
+This download contains JetBrains Mono as both variable fonts and static fonts.
+
+JetBrains Mono is a variable font with this axis:
+  wght
+
+This means all the styles are contained in these files:
+  JetBrains_Mono/JetBrainsMono-VariableFont_wght.ttf
+  JetBrains_Mono/JetBrainsMono-Italic-VariableFont_wght.ttf
+
+If your app fully supports variable fonts, you can now pick intermediate styles
+that aren’t available as static fonts. Not all apps support variable fonts, and
+in those cases you can use the static font files for JetBrains Mono:
+  JetBrains_Mono/static/JetBrainsMono-Thin.ttf
+  JetBrains_Mono/static/JetBrainsMono-ExtraLight.ttf
+  JetBrains_Mono/static/JetBrainsMono-Light.ttf
+  JetBrains_Mono/static/JetBrainsMono-Regular.ttf
+  JetBrains_Mono/static/JetBrainsMono-Medium.ttf
+  JetBrains_Mono/static/JetBrainsMono-SemiBold.ttf
+  JetBrains_Mono/static/JetBrainsMono-Bold.ttf
+  JetBrains_Mono/static/JetBrainsMono-ExtraBold.ttf
+  JetBrains_Mono/static/JetBrainsMono-ThinItalic.ttf
+  JetBrains_Mono/static/JetBrainsMono-ExtraLightItalic.ttf
+  JetBrains_Mono/static/JetBrainsMono-LightItalic.ttf
+  JetBrains_Mono/static/JetBrainsMono-Italic.ttf
+  JetBrains_Mono/static/JetBrainsMono-MediumItalic.ttf
+  JetBrains_Mono/static/JetBrainsMono-SemiBoldItalic.ttf
+  JetBrains_Mono/static/JetBrainsMono-BoldItalic.ttf
+  JetBrains_Mono/static/JetBrainsMono-ExtraBoldItalic.ttf
+
+Get started
+-----------
+
+1. Install the font files you want to use
+
+2. Use your app's font picker to view the font family and all the
+available styles
+
+Learn more about variable fonts
+-------------------------------
+
+  https://developers.google.com/web/fundamentals/design-and-ux/typography/variable-fonts
+  https://variablefonts.typenetwork.com
+  https://medium.com/variable-fonts
+
+In desktop apps
+
+  https://theblog.adobe.com/can-variable-fonts-illustrator-cc
+  https://helpx.adobe.com/nz/photoshop/using/fonts.html#variable_fonts
+
+Online
+
+  https://developers.google.com/fonts/docs/getting_started
+  https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Fonts/Variable_Fonts_Guide
+  https://developer.microsoft.com/en-us/microsoft-edge/testdrive/demos/variable-fonts
+
+Installing fonts
+
+  MacOS: https://support.apple.com/en-us/HT201749
+  Linux: https://www.google.com/search?q=how+to+install+a+font+on+gnu%2Blinux
+  Windows: https://support.microsoft.com/en-us/help/314960/how-to-install-or-remove-a-font-in-windows
+
+Android Apps
+
+  https://developers.google.com/fonts/docs/android
+  https://developer.android.com/guide/topics/ui/look-and-feel/downloadable-fonts
+
+License
+-------
+Please read the full license text (OFL.txt) to understand the permissions,
+restrictions and requirements for usage, redistribution, and modification.
+
+You can use them in your products & projects – print or digital,
+commercial or otherwise.
+
+This isn't legal advice, please consider consulting a lawyer and see the full
+license for all details.
diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Bold.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Bold.ttf
new file mode 100644
index 0000000..1926c80
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-BoldItalic.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-BoldItalic.ttf
new file mode 100644
index 0000000..a447751
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraBold.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraBold.ttf
new file mode 100644
index 0000000..0c5f863
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraBoldItalic.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraBoldItalic.ttf
new file mode 100644
index 0000000..d62fc3c
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraLight.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraLight.ttf
new file mode 100644
index 0000000..605f79d
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraLightItalic.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-ExtraLightItalic.ttf
new file mode 100644
index 0000000..befe9d2
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Italic.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Italic.ttf
new file mode 100644
index 0000000..8cf794a
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Light.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Light.ttf
new file mode 100644
index 0000000..9d5d8a5
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-LightItalic.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-LightItalic.ttf
new file mode 100644
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Medium.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Medium.ttf
new file mode 100644
index 0000000..ad71d92
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-MediumItalic.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-MediumItalic.ttf
new file mode 100644
index 0000000..4c96cc5
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Regular.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Regular.ttf
new file mode 100644
index 0000000..436c982
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-SemiBold.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-SemiBold.ttf
new file mode 100644
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-SemiBoldItalic.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-SemiBoldItalic.ttf
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diff --git a/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Thin.ttf b/programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Thin.ttf
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diff --git a/programs/gui/fonts/Roboto/OFL.txt b/programs/gui/fonts/Roboto/OFL.txt
new file mode 100644
index 0000000..a417551
--- /dev/null
+++ b/programs/gui/fonts/Roboto/OFL.txt
@@ -0,0 +1,93 @@
+Copyright 2011 The Roboto Project Authors (https://github.com/googlefonts/roboto-classic)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
diff --git a/programs/gui/fonts/Roboto/README.txt b/programs/gui/fonts/Roboto/README.txt
new file mode 100644
index 0000000..3d6736b
--- /dev/null
+++ b/programs/gui/fonts/Roboto/README.txt
@@ -0,0 +1,118 @@
+Roboto Variable Font
+====================
+
+This download contains Roboto as both variable fonts and static fonts.
+
+Roboto is a variable font with these axes:
+  wdth
+  wght
+
+This means all the styles are contained in these files:
+  Roboto/Roboto-VariableFont_wdth,wght.ttf
+  Roboto/Roboto-Italic-VariableFont_wdth,wght.ttf
+
+If your app fully supports variable fonts, you can now pick intermediate styles
+that aren’t available as static fonts. Not all apps support variable fonts, and
+in those cases you can use the static font files for Roboto:
+  Roboto/static/Roboto_Condensed-Thin.ttf
+  Roboto/static/Roboto_Condensed-ExtraLight.ttf
+  Roboto/static/Roboto_Condensed-Light.ttf
+  Roboto/static/Roboto_Condensed-Regular.ttf
+  Roboto/static/Roboto_Condensed-Medium.ttf
+  Roboto/static/Roboto_Condensed-SemiBold.ttf
+  Roboto/static/Roboto_Condensed-Bold.ttf
+  Roboto/static/Roboto_Condensed-ExtraBold.ttf
+  Roboto/static/Roboto_Condensed-Black.ttf
+  Roboto/static/Roboto_SemiCondensed-Thin.ttf
+  Roboto/static/Roboto_SemiCondensed-ExtraLight.ttf
+  Roboto/static/Roboto_SemiCondensed-Light.ttf
+  Roboto/static/Roboto_SemiCondensed-Regular.ttf
+  Roboto/static/Roboto_SemiCondensed-Medium.ttf
+  Roboto/static/Roboto_SemiCondensed-SemiBold.ttf
+  Roboto/static/Roboto_SemiCondensed-Bold.ttf
+  Roboto/static/Roboto_SemiCondensed-ExtraBold.ttf
+  Roboto/static/Roboto_SemiCondensed-Black.ttf
+  Roboto/static/Roboto-Thin.ttf
+  Roboto/static/Roboto-ExtraLight.ttf
+  Roboto/static/Roboto-Light.ttf
+  Roboto/static/Roboto-Regular.ttf
+  Roboto/static/Roboto-Medium.ttf
+  Roboto/static/Roboto-SemiBold.ttf
+  Roboto/static/Roboto-Bold.ttf
+  Roboto/static/Roboto-ExtraBold.ttf
+  Roboto/static/Roboto-Black.ttf
+  Roboto/static/Roboto_Condensed-ThinItalic.ttf
+  Roboto/static/Roboto_Condensed-ExtraLightItalic.ttf
+  Roboto/static/Roboto_Condensed-LightItalic.ttf
+  Roboto/static/Roboto_Condensed-Italic.ttf
+  Roboto/static/Roboto_Condensed-MediumItalic.ttf
+  Roboto/static/Roboto_Condensed-SemiBoldItalic.ttf
+  Roboto/static/Roboto_Condensed-BoldItalic.ttf
+  Roboto/static/Roboto_Condensed-ExtraBoldItalic.ttf
+  Roboto/static/Roboto_Condensed-BlackItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-ThinItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-ExtraLightItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-LightItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-Italic.ttf
+  Roboto/static/Roboto_SemiCondensed-MediumItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-SemiBoldItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-BoldItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-ExtraBoldItalic.ttf
+  Roboto/static/Roboto_SemiCondensed-BlackItalic.ttf
+  Roboto/static/Roboto-ThinItalic.ttf
+  Roboto/static/Roboto-ExtraLightItalic.ttf
+  Roboto/static/Roboto-LightItalic.ttf
+  Roboto/static/Roboto-Italic.ttf
+  Roboto/static/Roboto-MediumItalic.ttf
+  Roboto/static/Roboto-SemiBoldItalic.ttf
+  Roboto/static/Roboto-BoldItalic.ttf
+  Roboto/static/Roboto-ExtraBoldItalic.ttf
+  Roboto/static/Roboto-BlackItalic.ttf
+
+Get started
+-----------
+
+1. Install the font files you want to use
+
+2. Use your app's font picker to view the font family and all the
+available styles
+
+Learn more about variable fonts
+-------------------------------
+
+  https://developers.google.com/web/fundamentals/design-and-ux/typography/variable-fonts
+  https://variablefonts.typenetwork.com
+  https://medium.com/variable-fonts
+
+In desktop apps
+
+  https://theblog.adobe.com/can-variable-fonts-illustrator-cc
+  https://helpx.adobe.com/nz/photoshop/using/fonts.html#variable_fonts
+
+Online
+
+  https://developers.google.com/fonts/docs/getting_started
+  https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Fonts/Variable_Fonts_Guide
+  https://developer.microsoft.com/en-us/microsoft-edge/testdrive/demos/variable-fonts
+
+Installing fonts
+
+  MacOS: https://support.apple.com/en-us/HT201749
+  Linux: https://www.google.com/search?q=how+to+install+a+font+on+gnu%2Blinux
+  Windows: https://support.microsoft.com/en-us/help/314960/how-to-install-or-remove-a-font-in-windows
+
+Android Apps
+
+  https://developers.google.com/fonts/docs/android
+  https://developer.android.com/guide/topics/ui/look-and-feel/downloadable-fonts
+
+License
+-------
+Please read the full license text (OFL.txt) to understand the permissions,
+restrictions and requirements for usage, redistribution, and modification.
+
+You can use them in your products & projects – print or digital,
+commercial or otherwise.
+
+This isn't legal advice, please consider consulting a lawyer and see the full
+license for all details.
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-ExtraLight.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-ExtraLight.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-ExtraLightItalic.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-ExtraLightItalic.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Italic.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Italic.ttf
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index 0000000..fb944fb
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Light.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Light.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-LightItalic.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-LightItalic.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Medium.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Medium.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Regular.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Regular.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-SemiBold.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-SemiBold.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-SemiBoldItalic.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-SemiBoldItalic.ttf
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Thin.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-Thin.ttf
new file mode 100644
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diff --git a/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-ThinItalic.ttf b/programs/gui/fonts/Roboto/static/Roboto_SemiCondensed-ThinItalic.ttf
new file mode 100644
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diff --git a/programs/include/Api/Syscall.hpp b/programs/include/Api/Syscall.hpp
index 7ff7a20..43f309f 100644
--- a/programs/include/Api/Syscall.hpp
+++ b/programs/include/Api/Syscall.hpp
@@ -66,6 +66,20 @@ namespace Zenith {
     static constexpr uint64_t SYS_CHILDIO_WRITEKEY = 52;
     static constexpr uint64_t SYS_CHILDIO_SETTERMSZ = 53;
 
+    // Window server syscalls
+    static constexpr uint64_t SYS_WINCREATE    = 54;
+    static constexpr uint64_t SYS_WINDESTROY   = 55;
+    static constexpr uint64_t SYS_WINPRESENT   = 56;
+    static constexpr uint64_t SYS_WINPOLL      = 57;
+    static constexpr uint64_t SYS_WINENUM      = 58;
+    static constexpr uint64_t SYS_WINMAP       = 59;
+    static constexpr uint64_t SYS_WINSENDEVENT = 60;
+
+    // Process management syscalls
+    static constexpr uint64_t SYS_PROCLIST    = 61;
+    static constexpr uint64_t SYS_KILL        = 62;
+    static constexpr uint64_t SYS_DEVLIST     = 63;
+
     static constexpr int SOCK_TCP = 1;
     static constexpr int SOCK_UDP = 2;
 
@@ -118,4 +132,46 @@ namespace Zenith {
         uint8_t  buttons;
     };
 
+    // Window server shared types
+    struct WinEvent {
+        uint8_t type;     // 0=key, 1=mouse, 2=resize, 3=close
+        uint8_t _pad[3];
+        union {
+            KeyEvent key;
+            struct { int32_t x, y, scroll; uint8_t buttons, prev_buttons; } mouse;
+            struct { int32_t w, h; } resize;
+        };
+    };
+
+    struct WinInfo {
+        int32_t  id;
+        int32_t  ownerPid;
+        char     title[64];
+        int32_t  width, height;
+        uint8_t  dirty;
+        uint8_t  _pad2[3];
+    };
+
+    struct WinCreateResult {
+        int32_t  id;       // -1 on failure
+        uint32_t _pad;
+        uint64_t pixelVa;  // VA of pixel buffer in caller's address space
+    };
+
+    struct DevInfo {
+        uint8_t  category;     // 0=CPU, 1=Interrupt, 2=Timer, 3=Input, 4=USB, 5=Network, 6=Display, 7=PCI
+        uint8_t  _pad[3];
+        char     name[48];
+        char     detail[48];
+    };
+
+    struct ProcInfo {
+        int32_t  pid;
+        int32_t  parentPid;
+        uint8_t  state;        // 0=Free, 1=Ready, 2=Running, 3=Terminated
+        uint8_t  _pad[3];
+        char     name[64];
+        uint64_t heapUsed;     // heapNext - UserHeapBase (bytes)
+    };
+
 }
diff --git a/programs/include/gui/canvas.hpp b/programs/include/gui/canvas.hpp
index 10c16fd..a3f3853 100644
--- a/programs/include/gui/canvas.hpp
+++ b/programs/include/gui/canvas.hpp
@@ -99,6 +99,10 @@ struct Canvas {
     // ---- Text ----
 
     void text(int x, int y, const char* str, Color c) {
+        if (fonts::system_font && fonts::system_font->valid) {
+            fonts::system_font->draw_to_buffer(pixels, w, h, x, y, str, c, fonts::UI_SIZE);
+            return;
+        }
         uint32_t px = c.to_pixel();
         for (int i = 0; str[i] && x + (i + 1) * FONT_WIDTH <= w; i++) {
             const uint8_t* glyph = &font_data[(unsigned char)str[i] * FONT_HEIGHT];
@@ -118,6 +122,10 @@ struct Canvas {
     }
 
     void text_2x(int x, int y, const char* str, Color c) {
+        if (fonts::system_font && fonts::system_font->valid) {
+            fonts::system_font->draw_to_buffer(pixels, w, h, x, y, str, c, fonts::LARGE_SIZE);
+            return;
+        }
         uint32_t px = c.to_pixel();
         for (int i = 0; str[i] && x + (i + 1) * FONT_WIDTH * 2 <= w; i++) {
             const uint8_t* glyph = &font_data[(unsigned char)str[i] * FONT_HEIGHT];
@@ -141,6 +149,14 @@ struct Canvas {
         }
     }
 
+    void text_mono(int x, int y, const char* str, Color c) {
+        if (fonts::mono && fonts::mono->valid) {
+            fonts::mono->draw_to_buffer(pixels, w, h, x, y, str, c, fonts::TERM_SIZE);
+            return;
+        }
+        text(x, y, str, c);
+    }
+
     // ---- Icons ----
 
     void icon(int x, int y, const SvgIcon& ic) {
@@ -176,7 +192,8 @@ struct Canvas {
 
     // ---- High-level helpers ----
 
-    void kv_line(int x, int* y, const char* line, Color c, int line_h = FONT_HEIGHT + 6) {
+    void kv_line(int x, int* y, const char* line, Color c, int line_h = 0) {
+        if (line_h == 0) line_h = system_font_height() + 6;
         text(x, *y, line, c);
         *y += line_h;
     }
@@ -190,8 +207,9 @@ struct Canvas {
                 Color bg, Color fg, int radius = 4) {
         fill_rounded_rect(x, y, bw, bh, radius, bg);
         int tw = text_width(label);
+        int fh = system_font_height();
         int tx = x + (bw - tw) / 2;
-        int ty = y + (bh - FONT_HEIGHT) / 2;
+        int ty = y + (bh - fh) / 2;
         text(tx, ty, label, fg);
     }
 };
diff --git a/programs/include/gui/desktop.hpp b/programs/include/gui/desktop.hpp
index 51b5689..d46f693 100644
--- a/programs/include/gui/desktop.hpp
+++ b/programs/include/gui/desktop.hpp
@@ -18,6 +18,25 @@ namespace gui {
 static constexpr int MAX_WINDOWS = 8;
 static constexpr int PANEL_HEIGHT = 32;
 
+struct DesktopSettings {
+    // Background
+    bool bg_gradient;       // true = gradient, false = solid
+    Color bg_solid;         // solid background color
+    Color bg_grad_top;      // gradient top color
+    Color bg_grad_bottom;   // gradient bottom color
+
+    // Panel
+    Color panel_color;      // panel background color
+
+    // Accent
+    Color accent_color;     // buttons, highlights, active indicators
+
+    // Display
+    bool show_shadows;      // window shadows on/off
+    bool clock_24h;         // 24-hour clock format
+    int ui_scale;           // 0=Small, 1=Default, 2=Large
+};
+
 struct DesktopState {
     Framebuffer fb;
     Window windows[MAX_WINDOWS];
@@ -54,6 +73,11 @@ struct DesktopState {
     SvgIcon icon_settings;
     SvgIcon icon_reboot;
 
+    SvgIcon icon_doom;
+    SvgIcon icon_procmgr;
+    SvgIcon icon_mandelbrot;
+    SvgIcon icon_devexplorer;
+
     bool ctx_menu_open;
     int ctx_menu_x, ctx_menu_y;
 
@@ -63,6 +87,8 @@ struct DesktopState {
     Rect net_icon_rect;
 
     int screen_w, screen_h;
+
+    DesktopSettings settings;
 };
 
 // Forward declarations - implemented in main.cpp
diff --git a/programs/include/gui/font.hpp b/programs/include/gui/font.hpp
index 11c5f6a..b96b2de 100644
--- a/programs/include/gui/font.hpp
+++ b/programs/include/gui/font.hpp
@@ -1,12 +1,13 @@
 /*
     * font.hpp
-    * ZenithOS 8x16 VGA bitmap font rendering
+    * ZenithOS text rendering — TrueType with bitmap fallback
     * Copyright (c) 2025 Daniel Hammer
 */
 
 #pragma once
 #include "gui/gui.hpp"
 #include "gui/framebuffer.hpp"
+#include "gui/truetype.hpp"
 
 namespace gui {
 
@@ -16,6 +17,30 @@ static constexpr int FONT_HEIGHT = 16;
 // Defined in font_data.cpp
 extern const uint8_t font_data[256 * 16];
 
+// Dynamic font height: TTF line height or 16 (bitmap fallback)
+inline int system_font_height() {
+    if (fonts::system_font && fonts::system_font->valid)
+        return fonts::system_font->get_line_height(fonts::UI_SIZE);
+    return FONT_HEIGHT;
+}
+
+// Dynamic mono font cell dimensions
+inline int mono_cell_width() {
+    if (fonts::mono && fonts::mono->valid) {
+        // Monospace: all glyphs have the same advance
+        GlyphCache* gc = fonts::mono->get_cache(fonts::TERM_SIZE);
+        CachedGlyph* g = fonts::mono->get_glyph(gc, 'M');
+        if (g) return g->advance;
+    }
+    return FONT_WIDTH;
+}
+
+inline int mono_cell_height() {
+    if (fonts::mono && fonts::mono->valid)
+        return fonts::mono->get_line_height(fonts::TERM_SIZE);
+    return FONT_HEIGHT;
+}
+
 inline void draw_char(Framebuffer& fb, int x, int y, char c, Color fg) {
     const uint8_t* glyph = &font_data[(unsigned char)c * FONT_HEIGHT];
     for (int row = 0; row < FONT_HEIGHT; row++) {
@@ -43,18 +68,29 @@ inline void draw_char_bg(Framebuffer& fb, int x, int y, char c, Color fg, Color
 }
 
 inline void draw_text(Framebuffer& fb, int x, int y, const char* text, Color fg) {
+    if (fonts::system_font && fonts::system_font->valid) {
+        fonts::system_font->draw(fb, x, y, text, fg, fonts::UI_SIZE);
+        return;
+    }
     for (int i = 0; text[i]; i++) {
         draw_char(fb, x + i * FONT_WIDTH, y, text[i], fg);
     }
 }
 
 inline void draw_text_bg(Framebuffer& fb, int x, int y, const char* text, Color fg, Color bg) {
+    if (fonts::system_font && fonts::system_font->valid) {
+        fonts::system_font->draw_bg(fb, x, y, text, fg, bg, fonts::UI_SIZE);
+        return;
+    }
     for (int i = 0; text[i]; i++) {
         draw_char_bg(fb, x + i * FONT_WIDTH, y, text[i], fg, bg);
     }
 }
 
 inline int text_width(const char* text) {
+    if (fonts::system_font && fonts::system_font->valid) {
+        return fonts::system_font->measure_text(text, fonts::UI_SIZE);
+    }
     int len = 0;
     while (text[len]) len++;
     return len * FONT_WIDTH;
diff --git a/programs/include/gui/gui.hpp b/programs/include/gui/gui.hpp
index 2f178bc..ddb9c6f 100644
--- a/programs/include/gui/gui.hpp
+++ b/programs/include/gui/gui.hpp
@@ -25,13 +25,13 @@ inline fixed_t fixed_from_parts(int whole, int frac_num, int frac_den) {
 struct Color {
     uint8_t r, g, b, a;
 
-    static Color from_rgb(uint8_t r, uint8_t g, uint8_t b) { return {r, g, b, 255}; }
-    static Color from_rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a) { return {r, g, b, a}; }
-    static Color from_hex(uint32_t hex) {
+    static constexpr Color from_rgb(uint8_t r, uint8_t g, uint8_t b) { return {r, g, b, 255}; }
+    static constexpr Color from_rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a) { return {r, g, b, a}; }
+    static constexpr Color from_hex(uint32_t hex) {
         return {(uint8_t)((hex >> 16) & 0xFF), (uint8_t)((hex >> 8) & 0xFF), (uint8_t)(hex & 0xFF), 255};
     }
 
-    uint32_t to_pixel() const { return ((uint32_t)a << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b; }
+    constexpr uint32_t to_pixel() const { return ((uint32_t)a << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b; }
 };
 
 // Named colors for the desktop theme
diff --git a/programs/include/gui/stb_math.h b/programs/include/gui/stb_math.h
new file mode 100644
index 0000000..07875b2
--- /dev/null
+++ b/programs/include/gui/stb_math.h
@@ -0,0 +1,95 @@
+/*
+    * stb_math.h
+    * Math functions for stb_truetype in freestanding environment
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#ifndef STB_MATH_H
+#define STB_MATH_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline double stb_floor(double x) {
+    double i = (double)(long long)x;
+    return (x < i) ? i - 1.0 : i;
+}
+
+static inline double stb_ceil(double x) {
+    double f = stb_floor(x);
+    return (x > f) ? f + 1.0 : f;
+}
+
+static inline double stb_fabs(double x) {
+    return x < 0.0 ? -x : x;
+}
+
+static inline double stb_fmod(double x, double y) {
+    if (y == 0.0) return 0.0;
+    return x - (double)((long long)(x / y)) * y;
+}
+
+static inline double stb_sqrt(double x) {
+    if (x <= 0.0) return 0.0;
+    double guess = x;
+    for (int i = 0; i < 30; i++)
+        guess = (guess + x / guess) * 0.5;
+    return guess;
+}
+
+static inline double stb_pow(double base, double exp) {
+    if (exp == 0.0) return 1.0;
+    if (exp == 1.0) return base;
+    if (base == 0.0) return 0.0;
+    // Integer exponent fast path
+    if (exp == (double)(long long)exp) {
+        long long e = (long long)exp;
+        int neg = 0;
+        if (e < 0) { neg = 1; e = -e; }
+        double r = 1.0;
+        double b = base;
+        while (e > 0) {
+            if (e & 1) r *= b;
+            b *= b;
+            e >>= 1;
+        }
+        return neg ? 1.0 / r : r;
+    }
+    return 0.0;
+}
+
+static inline double stb_cos(double x) {
+    // Reduce to [0, 2*pi]
+    const double PI = 3.14159265358979323846;
+    const double TWO_PI = 6.28318530717958647692;
+    x = stb_fmod(stb_fabs(x), TWO_PI);
+    // Taylor series: cos(x) = 1 - x^2/2! + x^4/4! - x^6/6! + ...
+    double x2 = x * x;
+    double term = 1.0;
+    double result = 1.0;
+    for (int i = 1; i <= 10; i++) {
+        term *= -x2 / (double)((2 * i - 1) * (2 * i));
+        result += term;
+    }
+    return result;
+}
+
+static inline double stb_acos(double x) {
+    // Clamp input
+    if (x <= -1.0) return 3.14159265358979323846;
+    if (x >= 1.0) return 0.0;
+    // Polynomial approximation (Abramowitz & Stegun style)
+    double ax = stb_fabs(x);
+    double result = (-0.0187293 * ax + 0.0742610) * ax - 0.2121144;
+    result = (result * ax + 1.5707288) * stb_sqrt(1.0 - ax);
+    if (x < 0.0)
+        return 3.14159265358979323846 - result;
+    return result;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // STB_MATH_H
diff --git a/programs/include/gui/stb_truetype.h b/programs/include/gui/stb_truetype.h
new file mode 100644
index 0000000..90a5c2e
--- /dev/null
+++ b/programs/include/gui/stb_truetype.h
@@ -0,0 +1,5079 @@
+// stb_truetype.h - v1.26 - public domain
+// authored from 2009-2021 by Sean Barrett / RAD Game Tools
+//
+// =======================================================================
+//
+//    NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES
+//
+// This library does no range checking of the offsets found in the file,
+// meaning an attacker can use it to read arbitrary memory.
+//
+// =======================================================================
+//
+//   This library processes TrueType files:
+//        parse files
+//        extract glyph metrics
+//        extract glyph shapes
+//        render glyphs to one-channel bitmaps with antialiasing (box filter)
+//        render glyphs to one-channel SDF bitmaps (signed-distance field/function)
+//
+//   Todo:
+//        non-MS cmaps
+//        crashproof on bad data
+//        hinting? (no longer patented)
+//        cleartype-style AA?
+//        optimize: use simple memory allocator for intermediates
+//        optimize: build edge-list directly from curves
+//        optimize: rasterize directly from curves?
+//
+// ADDITIONAL CONTRIBUTORS
+//
+//   Mikko Mononen: compound shape support, more cmap formats
+//   Tor Andersson: kerning, subpixel rendering
+//   Dougall Johnson: OpenType / Type 2 font handling
+//   Daniel Ribeiro Maciel: basic GPOS-based kerning
+//
+//   Misc other:
+//       Ryan Gordon
+//       Simon Glass
+//       github:IntellectualKitty
+//       Imanol Celaya
+//       Daniel Ribeiro Maciel
+//
+//   Bug/warning reports/fixes:
+//       "Zer" on mollyrocket       Fabian "ryg" Giesen   github:NiLuJe
+//       Cass Everitt               Martins Mozeiko       github:aloucks
+//       stoiko (Haemimont Games)   Cap Petschulat        github:oyvindjam
+//       Brian Hook                 Omar Cornut           github:vassvik
+//       Walter van Niftrik         Ryan Griege
+//       David Gow                  Peter LaValle
+//       David Given                Sergey Popov
+//       Ivan-Assen Ivanov          Giumo X. Clanjor
+//       Anthony Pesch              Higor Euripedes
+//       Johan Duparc               Thomas Fields
+//       Hou Qiming                 Derek Vinyard
+//       Rob Loach                  Cort Stratton
+//       Kenney Phillis Jr.         Brian Costabile
+//       Ken Voskuil (kaesve)       Yakov Galka
+//
+// VERSION HISTORY
+//
+//   1.26 (2021-08-28) fix broken rasterizer
+//   1.25 (2021-07-11) many fixes
+//   1.24 (2020-02-05) fix warning
+//   1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS)
+//   1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined
+//   1.21 (2019-02-25) fix warning
+//   1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics()
+//   1.19 (2018-02-11) GPOS kerning, STBTT_fmod
+//   1.18 (2018-01-29) add missing function
+//   1.17 (2017-07-23) make more arguments const; doc fix
+//   1.16 (2017-07-12) SDF support
+//   1.15 (2017-03-03) make more arguments const
+//   1.14 (2017-01-16) num-fonts-in-TTC function
+//   1.13 (2017-01-02) support OpenType fonts, certain Apple fonts
+//   1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual
+//   1.11 (2016-04-02) fix unused-variable warning
+//   1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef
+//   1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly
+//   1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
+//   1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
+//                     variant PackFontRanges to pack and render in separate phases;
+//                     fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
+//                     fixed an assert() bug in the new rasterizer
+//                     replace assert() with STBTT_assert() in new rasterizer
+//
+//   Full history can be found at the end of this file.
+//
+// LICENSE
+//
+//   See end of file for license information.
+//
+// USAGE
+//
+//   Include this file in whatever places need to refer to it. In ONE C/C++
+//   file, write:
+//      #define STB_TRUETYPE_IMPLEMENTATION
+//   before the #include of this file. This expands out the actual
+//   implementation into that C/C++ file.
+//
+//   To make the implementation private to the file that generates the implementation,
+//      #define STBTT_STATIC
+//
+//   Simple 3D API (don't ship this, but it's fine for tools and quick start)
+//           stbtt_BakeFontBitmap()               -- bake a font to a bitmap for use as texture
+//           stbtt_GetBakedQuad()                 -- compute quad to draw for a given char
+//
+//   Improved 3D API (more shippable):
+//           #include "stb_rect_pack.h"           -- optional, but you really want it
+//           stbtt_PackBegin()
+//           stbtt_PackSetOversampling()          -- for improved quality on small fonts
+//           stbtt_PackFontRanges()               -- pack and renders
+//           stbtt_PackEnd()
+//           stbtt_GetPackedQuad()
+//
+//   "Load" a font file from a memory buffer (you have to keep the buffer loaded)
+//           stbtt_InitFont()
+//           stbtt_GetFontOffsetForIndex()        -- indexing for TTC font collections
+//           stbtt_GetNumberOfFonts()             -- number of fonts for TTC font collections
+//
+//   Render a unicode codepoint to a bitmap
+//           stbtt_GetCodepointBitmap()           -- allocates and returns a bitmap
+//           stbtt_MakeCodepointBitmap()          -- renders into bitmap you provide
+//           stbtt_GetCodepointBitmapBox()        -- how big the bitmap must be
+//
+//   Character advance/positioning
+//           stbtt_GetCodepointHMetrics()
+//           stbtt_GetFontVMetrics()
+//           stbtt_GetFontVMetricsOS2()
+//           stbtt_GetCodepointKernAdvance()
+//
+//   Starting with version 1.06, the rasterizer was replaced with a new,
+//   faster and generally-more-precise rasterizer. The new rasterizer more
+//   accurately measures pixel coverage for anti-aliasing, except in the case
+//   where multiple shapes overlap, in which case it overestimates the AA pixel
+//   coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If
+//   this turns out to be a problem, you can re-enable the old rasterizer with
+//        #define STBTT_RASTERIZER_VERSION 1
+//   which will incur about a 15% speed hit.
+//
+// ADDITIONAL DOCUMENTATION
+//
+//   Immediately after this block comment are a series of sample programs.
+//
+//   After the sample programs is the "header file" section. This section
+//   includes documentation for each API function.
+//
+//   Some important concepts to understand to use this library:
+//
+//      Codepoint
+//         Characters are defined by unicode codepoints, e.g. 65 is
+//         uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
+//         the hiragana for "ma".
+//
+//      Glyph
+//         A visual character shape (every codepoint is rendered as
+//         some glyph)
+//
+//      Glyph index
+//         A font-specific integer ID representing a glyph
+//
+//      Baseline
+//         Glyph shapes are defined relative to a baseline, which is the
+//         bottom of uppercase characters. Characters extend both above
+//         and below the baseline.
+//
+//      Current Point
+//         As you draw text to the screen, you keep track of a "current point"
+//         which is the origin of each character. The current point's vertical
+//         position is the baseline. Even "baked fonts" use this model.
+//
+//      Vertical Font Metrics
+//         The vertical qualities of the font, used to vertically position
+//         and space the characters. See docs for stbtt_GetFontVMetrics.
+//
+//      Font Size in Pixels or Points
+//         The preferred interface for specifying font sizes in stb_truetype
+//         is to specify how tall the font's vertical extent should be in pixels.
+//         If that sounds good enough, skip the next paragraph.
+//
+//         Most font APIs instead use "points", which are a common typographic
+//         measurement for describing font size, defined as 72 points per inch.
+//         stb_truetype provides a point API for compatibility. However, true
+//         "per inch" conventions don't make much sense on computer displays
+//         since different monitors have different number of pixels per
+//         inch. For example, Windows traditionally uses a convention that
+//         there are 96 pixels per inch, thus making 'inch' measurements have
+//         nothing to do with inches, and thus effectively defining a point to
+//         be 1.333 pixels. Additionally, the TrueType font data provides
+//         an explicit scale factor to scale a given font's glyphs to points,
+//         but the author has observed that this scale factor is often wrong
+//         for non-commercial fonts, thus making fonts scaled in points
+//         according to the TrueType spec incoherently sized in practice.
+//
+// DETAILED USAGE:
+//
+//  Scale:
+//    Select how high you want the font to be, in points or pixels.
+//    Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute
+//    a scale factor SF that will be used by all other functions.
+//
+//  Baseline:
+//    You need to select a y-coordinate that is the baseline of where
+//    your text will appear. Call GetFontBoundingBox to get the baseline-relative
+//    bounding box for all characters. SF*-y0 will be the distance in pixels
+//    that the worst-case character could extend above the baseline, so if
+//    you want the top edge of characters to appear at the top of the
+//    screen where y=0, then you would set the baseline to SF*-y0.
+//
+//  Current point:
+//    Set the current point where the first character will appear. The
+//    first character could extend left of the current point; this is font
+//    dependent. You can either choose a current point that is the leftmost
+//    point and hope, or add some padding, or check the bounding box or
+//    left-side-bearing of the first character to be displayed and set
+//    the current point based on that.
+//
+//  Displaying a character:
+//    Compute the bounding box of the character. It will contain signed values
+//    relative to <current_point, baseline>. I.e. if it returns x0,y0,x1,y1,
+//    then the character should be displayed in the rectangle from
+//    <current_point+SF*x0, baseline+SF*y0> to <current_point+SF*x1,baseline+SF*y1).
+//
+//  Advancing for the next character:
+//    Call GlyphHMetrics, and compute 'current_point += SF * advance'.
+//
+//
+// ADVANCED USAGE
+//
+//   Quality:
+//
+//    - Use the functions with Subpixel at the end to allow your characters
+//      to have subpixel positioning. Since the font is anti-aliased, not
+//      hinted, this is very import for quality. (This is not possible with
+//      baked fonts.)
+//
+//    - Kerning is now supported, and if you're supporting subpixel rendering
+//      then kerning is worth using to give your text a polished look.
+//
+//   Performance:
+//
+//    - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
+//      if you don't do this, stb_truetype is forced to do the conversion on
+//      every call.
+//
+//    - There are a lot of memory allocations. We should modify it to take
+//      a temp buffer and allocate from the temp buffer (without freeing),
+//      should help performance a lot.
+//
+// NOTES
+//
+//   The system uses the raw data found in the .ttf file without changing it
+//   and without building auxiliary data structures. This is a bit inefficient
+//   on little-endian systems (the data is big-endian), but assuming you're
+//   caching the bitmaps or glyph shapes this shouldn't be a big deal.
+//
+//   It appears to be very hard to programmatically determine what font a
+//   given file is in a general way. I provide an API for this, but I don't
+//   recommend it.
+//
+//
+// PERFORMANCE MEASUREMENTS FOR 1.06:
+//
+//                      32-bit     64-bit
+//   Previous release:  8.83 s     7.68 s
+//   Pool allocations:  7.72 s     6.34 s
+//   Inline sort     :  6.54 s     5.65 s
+//   New rasterizer  :  5.63 s     5.00 s
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+////  SAMPLE PROGRAMS
+////
+//
+//  Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless.
+//  See "tests/truetype_demo_win32.c" for a complete version.
+#if 0
+#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
+#include "stb_truetype.h"
+
+unsigned char ttf_buffer[1<<20];
+unsigned char temp_bitmap[512*512];
+
+stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
+GLuint ftex;
+
+void my_stbtt_initfont(void)
+{
+   fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
+   stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
+   // can free ttf_buffer at this point
+   glGenTextures(1, &ftex);
+   glBindTexture(GL_TEXTURE_2D, ftex);
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
+   // can free temp_bitmap at this point
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+}
+
+void my_stbtt_print(float x, float y, char *text)
+{
+   // assume orthographic projection with units = screen pixels, origin at top left
+   glEnable(GL_BLEND);
+   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+   glEnable(GL_TEXTURE_2D);
+   glBindTexture(GL_TEXTURE_2D, ftex);
+   glBegin(GL_QUADS);
+   while (*text) {
+      if (*text >= 32 && *text < 128) {
+         stbtt_aligned_quad q;
+         stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
+         glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0);
+         glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0);
+         glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1);
+         glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1);
+      }
+      ++text;
+   }
+   glEnd();
+}
+#endif
+//
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program (this compiles): get a single bitmap, print as ASCII art
+//
+#if 0
+#include <stdio.h>
+#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
+#include "stb_truetype.h"
+
+char ttf_buffer[1<<25];
+
+int main(int argc, char **argv)
+{
+   stbtt_fontinfo font;
+   unsigned char *bitmap;
+   int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
+
+   fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
+
+   stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
+   bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
+
+   for (j=0; j < h; ++j) {
+      for (i=0; i < w; ++i)
+         putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
+      putchar('\n');
+   }
+   return 0;
+}
+#endif
+//
+// Output:
+//
+//     .ii.
+//    @@@@@@.
+//   V@Mio@@o
+//   :i.  V@V
+//     :oM@@M
+//   :@@@MM@M
+//   @@o  o@M
+//  :@@.  M@M
+//   @@@o@@@@
+//   :M@@V:@@.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program: print "Hello World!" banner, with bugs
+//
+#if 0
+char buffer[24<<20];
+unsigned char screen[20][79];
+
+int main(int arg, char **argv)
+{
+   stbtt_fontinfo font;
+   int i,j,ascent,baseline,ch=0;
+   float scale, xpos=2; // leave a little padding in case the character extends left
+   char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness
+
+   fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
+   stbtt_InitFont(&font, buffer, 0);
+
+   scale = stbtt_ScaleForPixelHeight(&font, 15);
+   stbtt_GetFontVMetrics(&font, &ascent,0,0);
+   baseline = (int) (ascent*scale);
+
+   while (text[ch]) {
+      int advance,lsb,x0,y0,x1,y1;
+      float x_shift = xpos - (float) floor(xpos);
+      stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
+      stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
+      stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
+      // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
+      // because this API is really for baking character bitmaps into textures. if you want to render
+      // a sequence of characters, you really need to render each bitmap to a temp buffer, then
+      // "alpha blend" that into the working buffer
+      xpos += (advance * scale);
+      if (text[ch+1])
+         xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
+      ++ch;
+   }
+
+   for (j=0; j < 20; ++j) {
+      for (i=0; i < 78; ++i)
+         putchar(" .:ioVM@"[screen[j][i]>>5]);
+      putchar('\n');
+   }
+
+   return 0;
+}
+#endif
+
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+////   INTEGRATION WITH YOUR CODEBASE
+////
+////   The following sections allow you to supply alternate definitions
+////   of C library functions used by stb_truetype, e.g. if you don't
+////   link with the C runtime library.
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+   // #define your own (u)stbtt_int8/16/32 before including to override this
+   #ifndef stbtt_uint8
+   typedef unsigned char   stbtt_uint8;
+   typedef signed   char   stbtt_int8;
+   typedef unsigned short  stbtt_uint16;
+   typedef signed   short  stbtt_int16;
+   typedef unsigned int    stbtt_uint32;
+   typedef signed   int    stbtt_int32;
+   #endif
+
+   typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
+   typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
+
+   // e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
+   #ifndef STBTT_ifloor
+   #include <math.h>
+   #define STBTT_ifloor(x)   ((int) floor(x))
+   #define STBTT_iceil(x)    ((int) ceil(x))
+   #endif
+
+   #ifndef STBTT_sqrt
+   #include <math.h>
+   #define STBTT_sqrt(x)      sqrt(x)
+   #define STBTT_pow(x,y)     pow(x,y)
+   #endif
+
+   #ifndef STBTT_fmod
+   #include <math.h>
+   #define STBTT_fmod(x,y)    fmod(x,y)
+   #endif
+
+   #ifndef STBTT_cos
+   #include <math.h>
+   #define STBTT_cos(x)       cos(x)
+   #define STBTT_acos(x)      acos(x)
+   #endif
+
+   #ifndef STBTT_fabs
+   #include <math.h>
+   #define STBTT_fabs(x)      fabs(x)
+   #endif
+
+   // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
+   #ifndef STBTT_malloc
+   #include <stdlib.h>
+   #define STBTT_malloc(x,u)  ((void)(u),malloc(x))
+   #define STBTT_free(x,u)    ((void)(u),free(x))
+   #endif
+
+   #ifndef STBTT_assert
+   #include <assert.h>
+   #define STBTT_assert(x)    assert(x)
+   #endif
+
+   #ifndef STBTT_strlen
+   #include <string.h>
+   #define STBTT_strlen(x)    strlen(x)
+   #endif
+
+   #ifndef STBTT_memcpy
+   #include <string.h>
+   #define STBTT_memcpy       memcpy
+   #define STBTT_memset       memset
+   #endif
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+////   INTERFACE
+////
+////
+
+#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
+#define __STB_INCLUDE_STB_TRUETYPE_H__
+
+#ifdef STBTT_STATIC
+#define STBTT_DEF static
+#else
+#define STBTT_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// private structure
+typedef struct
+{
+   unsigned char *data;
+   int cursor;
+   int size;
+} stbtt__buf;
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// TEXTURE BAKING API
+//
+// If you use this API, you only have to call two functions ever.
+//
+
+typedef struct
+{
+   unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
+   float xoff,yoff,xadvance;
+} stbtt_bakedchar;
+
+STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
+                                float pixel_height,                     // height of font in pixels
+                                unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
+                                int first_char, int num_chars,          // characters to bake
+                                stbtt_bakedchar *chardata);             // you allocate this, it's num_chars long
+// if return is positive, the first unused row of the bitmap
+// if return is negative, returns the negative of the number of characters that fit
+// if return is 0, no characters fit and no rows were used
+// This uses a very crappy packing.
+
+typedef struct
+{
+   float x0,y0,s0,t0; // top-left
+   float x1,y1,s1,t1; // bottom-right
+} stbtt_aligned_quad;
+
+STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph,  // same data as above
+                               int char_index,             // character to display
+                               float *xpos, float *ypos,   // pointers to current position in screen pixel space
+                               stbtt_aligned_quad *q,      // output: quad to draw
+                               int opengl_fillrule);       // true if opengl fill rule; false if DX9 or earlier
+// Call GetBakedQuad with char_index = 'character - first_char', and it
+// creates the quad you need to draw and advances the current position.
+//
+// The coordinate system used assumes y increases downwards.
+//
+// Characters will extend both above and below the current position;
+// see discussion of "BASELINE" above.
+//
+// It's inefficient; you might want to c&p it and optimize it.
+
+STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap);
+// Query the font vertical metrics without having to create a font first.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// NEW TEXTURE BAKING API
+//
+// This provides options for packing multiple fonts into one atlas, not
+// perfectly but better than nothing.
+
+typedef struct
+{
+   unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
+   float xoff,yoff,xadvance;
+   float xoff2,yoff2;
+} stbtt_packedchar;
+
+typedef struct stbtt_pack_context stbtt_pack_context;
+typedef struct stbtt_fontinfo stbtt_fontinfo;
+#ifndef STB_RECT_PACK_VERSION
+typedef struct stbrp_rect stbrp_rect;
+#endif
+
+STBTT_DEF int  stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context);
+// Initializes a packing context stored in the passed-in stbtt_pack_context.
+// Future calls using this context will pack characters into the bitmap passed
+// in here: a 1-channel bitmap that is width * height. stride_in_bytes is
+// the distance from one row to the next (or 0 to mean they are packed tightly
+// together). "padding" is the amount of padding to leave between each
+// character (normally you want '1' for bitmaps you'll use as textures with
+// bilinear filtering).
+//
+// Returns 0 on failure, 1 on success.
+
+STBTT_DEF void stbtt_PackEnd  (stbtt_pack_context *spc);
+// Cleans up the packing context and frees all memory.
+
+#define STBTT_POINT_SIZE(x)   (-(x))
+
+STBTT_DEF int  stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size,
+                                int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range);
+// Creates character bitmaps from the font_index'th font found in fontdata (use
+// font_index=0 if you don't know what that is). It creates num_chars_in_range
+// bitmaps for characters with unicode values starting at first_unicode_char_in_range
+// and increasing. Data for how to render them is stored in chardata_for_range;
+// pass these to stbtt_GetPackedQuad to get back renderable quads.
+//
+// font_size is the full height of the character from ascender to descender,
+// as computed by stbtt_ScaleForPixelHeight. To use a point size as computed
+// by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE()
+// and pass that result as 'font_size':
+//       ...,                  20 , ... // font max minus min y is 20 pixels tall
+//       ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall
+
+typedef struct
+{
+   float font_size;
+   int first_unicode_codepoint_in_range;  // if non-zero, then the chars are continuous, and this is the first codepoint
+   int *array_of_unicode_codepoints;       // if non-zero, then this is an array of unicode codepoints
+   int num_chars;
+   stbtt_packedchar *chardata_for_range; // output
+   unsigned char h_oversample, v_oversample; // don't set these, they're used internally
+} stbtt_pack_range;
+
+STBTT_DEF int  stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges);
+// Creates character bitmaps from multiple ranges of characters stored in
+// ranges. This will usually create a better-packed bitmap than multiple
+// calls to stbtt_PackFontRange. Note that you can call this multiple
+// times within a single PackBegin/PackEnd.
+
+STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample);
+// Oversampling a font increases the quality by allowing higher-quality subpixel
+// positioning, and is especially valuable at smaller text sizes.
+//
+// This function sets the amount of oversampling for all following calls to
+// stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given
+// pack context. The default (no oversampling) is achieved by h_oversample=1
+// and v_oversample=1. The total number of pixels required is
+// h_oversample*v_oversample larger than the default; for example, 2x2
+// oversampling requires 4x the storage of 1x1. For best results, render
+// oversampled textures with bilinear filtering. Look at the readme in
+// stb/tests/oversample for information about oversampled fonts
+//
+// To use with PackFontRangesGather etc., you must set it before calls
+// call to PackFontRangesGatherRects.
+
+STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip);
+// If skip != 0, this tells stb_truetype to skip any codepoints for which
+// there is no corresponding glyph. If skip=0, which is the default, then
+// codepoints without a glyph recived the font's "missing character" glyph,
+// typically an empty box by convention.
+
+STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph,  // same data as above
+                               int char_index,             // character to display
+                               float *xpos, float *ypos,   // pointers to current position in screen pixel space
+                               stbtt_aligned_quad *q,      // output: quad to draw
+                               int align_to_integer);
+
+STBTT_DEF int  stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
+STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects);
+STBTT_DEF int  stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
+// Calling these functions in sequence is roughly equivalent to calling
+// stbtt_PackFontRanges(). If you more control over the packing of multiple
+// fonts, or if you want to pack custom data into a font texture, take a look
+// at the source to of stbtt_PackFontRanges() and create a custom version
+// using these functions, e.g. call GatherRects multiple times,
+// building up a single array of rects, then call PackRects once,
+// then call RenderIntoRects repeatedly. This may result in a
+// better packing than calling PackFontRanges multiple times
+// (or it may not).
+
+// this is an opaque structure that you shouldn't mess with which holds
+// all the context needed from PackBegin to PackEnd.
+struct stbtt_pack_context {
+   void *user_allocator_context;
+   void *pack_info;
+   int   width;
+   int   height;
+   int   stride_in_bytes;
+   int   padding;
+   int   skip_missing;
+   unsigned int   h_oversample, v_oversample;
+   unsigned char *pixels;
+   void  *nodes;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// FONT LOADING
+//
+//
+
+STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data);
+// This function will determine the number of fonts in a font file.  TrueType
+// collection (.ttc) files may contain multiple fonts, while TrueType font
+// (.ttf) files only contain one font. The number of fonts can be used for
+// indexing with the previous function where the index is between zero and one
+// less than the total fonts. If an error occurs, -1 is returned.
+
+STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
+// Each .ttf/.ttc file may have more than one font. Each font has a sequential
+// index number starting from 0. Call this function to get the font offset for
+// a given index; it returns -1 if the index is out of range. A regular .ttf
+// file will only define one font and it always be at offset 0, so it will
+// return '0' for index 0, and -1 for all other indices.
+
+// The following structure is defined publicly so you can declare one on
+// the stack or as a global or etc, but you should treat it as opaque.
+struct stbtt_fontinfo
+{
+   void           * userdata;
+   unsigned char  * data;              // pointer to .ttf file
+   int              fontstart;         // offset of start of font
+
+   int numGlyphs;                     // number of glyphs, needed for range checking
+
+   int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf
+   int index_map;                     // a cmap mapping for our chosen character encoding
+   int indexToLocFormat;              // format needed to map from glyph index to glyph
+
+   stbtt__buf cff;                    // cff font data
+   stbtt__buf charstrings;            // the charstring index
+   stbtt__buf gsubrs;                 // global charstring subroutines index
+   stbtt__buf subrs;                  // private charstring subroutines index
+   stbtt__buf fontdicts;              // array of font dicts
+   stbtt__buf fdselect;               // map from glyph to fontdict
+};
+
+STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
+// Given an offset into the file that defines a font, this function builds
+// the necessary cached info for the rest of the system. You must allocate
+// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
+// need to do anything special to free it, because the contents are pure
+// value data with no additional data structures. Returns 0 on failure.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER TO GLYPH-INDEX CONVERSIOn
+
+STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
+// If you're going to perform multiple operations on the same character
+// and you want a speed-up, call this function with the character you're
+// going to process, then use glyph-based functions instead of the
+// codepoint-based functions.
+// Returns 0 if the character codepoint is not defined in the font.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER PROPERTIES
+//
+
+STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose "height" is 'pixels' tall.
+// Height is measured as the distance from the highest ascender to the lowest
+// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
+// and computing:
+//       scale = pixels / (ascent - descent)
+// so if you prefer to measure height by the ascent only, use a similar calculation.
+
+STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose EM size is mapped to
+// 'pixels' tall. This is probably what traditional APIs compute, but
+// I'm not positive.
+
+STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
+// ascent is the coordinate above the baseline the font extends; descent
+// is the coordinate below the baseline the font extends (i.e. it is typically negative)
+// lineGap is the spacing between one row's descent and the next row's ascent...
+// so you should advance the vertical position by "*ascent - *descent + *lineGap"
+//   these are expressed in unscaled coordinates, so you must multiply by
+//   the scale factor for a given size
+
+STBTT_DEF int  stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap);
+// analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2
+// table (specific to MS/Windows TTF files).
+//
+// Returns 1 on success (table present), 0 on failure.
+
+STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
+// the bounding box around all possible characters
+
+STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
+// leftSideBearing is the offset from the current horizontal position to the left edge of the character
+// advanceWidth is the offset from the current horizontal position to the next horizontal position
+//   these are expressed in unscaled coordinates
+
+STBTT_DEF int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
+// an additional amount to add to the 'advance' value between ch1 and ch2
+
+STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
+// Gets the bounding box of the visible part of the glyph, in unscaled coordinates
+
+STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
+STBTT_DEF int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
+STBTT_DEF int  stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
+// as above, but takes one or more glyph indices for greater efficiency
+
+typedef struct stbtt_kerningentry
+{
+   int glyph1; // use stbtt_FindGlyphIndex
+   int glyph2;
+   int advance;
+} stbtt_kerningentry;
+
+STBTT_DEF int  stbtt_GetKerningTableLength(const stbtt_fontinfo *info);
+STBTT_DEF int  stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length);
+// Retrieves a complete list of all of the kerning pairs provided by the font
+// stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write.
+// The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1)
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// GLYPH SHAPES (you probably don't need these, but they have to go before
+// the bitmaps for C declaration-order reasons)
+//
+
+#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
+   enum {
+      STBTT_vmove=1,
+      STBTT_vline,
+      STBTT_vcurve,
+      STBTT_vcubic
+   };
+#endif
+
+#ifndef stbtt_vertex // you can predefine this to use different values
+                   // (we share this with other code at RAD)
+   #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
+   typedef struct
+   {
+      stbtt_vertex_type x,y,cx,cy,cx1,cy1;
+      unsigned char type,padding;
+   } stbtt_vertex;
+#endif
+
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
+// returns non-zero if nothing is drawn for this glyph
+
+STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
+STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
+// returns # of vertices and fills *vertices with the pointer to them
+//   these are expressed in "unscaled" coordinates
+//
+// The shape is a series of contours. Each one starts with
+// a STBTT_moveto, then consists of a series of mixed
+// STBTT_lineto and STBTT_curveto segments. A lineto
+// draws a line from previous endpoint to its x,y; a curveto
+// draws a quadratic bezier from previous endpoint to
+// its x,y, using cx,cy as the bezier control point.
+
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
+// frees the data allocated above
+
+STBTT_DEF unsigned char *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl);
+STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg);
+STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg);
+// fills svg with the character's SVG data.
+// returns data size or 0 if SVG not found.
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// BITMAP RENDERING
+//
+
+STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
+// frees the bitmap allocated below
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// allocates a large-enough single-channel 8bpp bitmap and renders the
+// specified character/glyph at the specified scale into it, with
+// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
+// *width & *height are filled out with the width & height of the bitmap,
+// which is stored left-to-right, top-to-bottom.
+//
+// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
+// shift for the character
+
+STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
+// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
+// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
+// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
+// width and height and positioning info for it first.
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
+// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
+// shift for the character
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint);
+// same as stbtt_MakeCodepointBitmapSubpixel, but prefiltering
+// is performed (see stbtt_PackSetOversampling)
+
+STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// get the bbox of the bitmap centered around the glyph origin; so the
+// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
+// the bitmap top left is (leftSideBearing*scale,iy0).
+// (Note that the bitmap uses y-increases-down, but the shape uses
+// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
+
+STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
+// shift for the character
+
+// the following functions are equivalent to the above functions, but operate
+// on glyph indices instead of Unicode codepoints (for efficiency)
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int glyph);
+STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+
+
+// @TODO: don't expose this structure
+typedef struct
+{
+   int w,h,stride;
+   unsigned char *pixels;
+} stbtt__bitmap;
+
+// rasterize a shape with quadratic beziers into a bitmap
+STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result,        // 1-channel bitmap to draw into
+                               float flatness_in_pixels,     // allowable error of curve in pixels
+                               stbtt_vertex *vertices,       // array of vertices defining shape
+                               int num_verts,                // number of vertices in above array
+                               float scale_x, float scale_y, // scale applied to input vertices
+                               float shift_x, float shift_y, // translation applied to input vertices
+                               int x_off, int y_off,         // another translation applied to input
+                               int invert,                   // if non-zero, vertically flip shape
+                               void *userdata);              // context for to STBTT_MALLOC
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Signed Distance Function (or Field) rendering
+
+STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata);
+// frees the SDF bitmap allocated below
+
+STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff);
+// These functions compute a discretized SDF field for a single character, suitable for storing
+// in a single-channel texture, sampling with bilinear filtering, and testing against
+// larger than some threshold to produce scalable fonts.
+//        info              --  the font
+//        scale             --  controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap
+//        glyph/codepoint   --  the character to generate the SDF for
+//        padding           --  extra "pixels" around the character which are filled with the distance to the character (not 0),
+//                                 which allows effects like bit outlines
+//        onedge_value      --  value 0-255 to test the SDF against to reconstruct the character (i.e. the isocontour of the character)
+//        pixel_dist_scale  --  what value the SDF should increase by when moving one SDF "pixel" away from the edge (on the 0..255 scale)
+//                                 if positive, > onedge_value is inside; if negative, < onedge_value is inside
+//        width,height      --  output height & width of the SDF bitmap (including padding)
+//        xoff,yoff         --  output origin of the character
+//        return value      --  a 2D array of bytes 0..255, width*height in size
+//
+// pixel_dist_scale & onedge_value are a scale & bias that allows you to make
+// optimal use of the limited 0..255 for your application, trading off precision
+// and special effects. SDF values outside the range 0..255 are clamped to 0..255.
+//
+// Example:
+//      scale = stbtt_ScaleForPixelHeight(22)
+//      padding = 5
+//      onedge_value = 180
+//      pixel_dist_scale = 180/5.0 = 36.0
+//
+//      This will create an SDF bitmap in which the character is about 22 pixels
+//      high but the whole bitmap is about 22+5+5=32 pixels high. To produce a filled
+//      shape, sample the SDF at each pixel and fill the pixel if the SDF value
+//      is greater than or equal to 180/255. (You'll actually want to antialias,
+//      which is beyond the scope of this example.) Additionally, you can compute
+//      offset outlines (e.g. to stroke the character border inside & outside,
+//      or only outside). For example, to fill outside the character up to 3 SDF
+//      pixels, you would compare against (180-36.0*3)/255 = 72/255. The above
+//      choice of variables maps a range from 5 pixels outside the shape to
+//      2 pixels inside the shape to 0..255; this is intended primarily for apply
+//      outside effects only (the interior range is needed to allow proper
+//      antialiasing of the font at *smaller* sizes)
+//
+// The function computes the SDF analytically at each SDF pixel, not by e.g.
+// building a higher-res bitmap and approximating it. In theory the quality
+// should be as high as possible for an SDF of this size & representation, but
+// unclear if this is true in practice (perhaps building a higher-res bitmap
+// and computing from that can allow drop-out prevention).
+//
+// The algorithm has not been optimized at all, so expect it to be slow
+// if computing lots of characters or very large sizes.
+
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Finding the right font...
+//
+// You should really just solve this offline, keep your own tables
+// of what font is what, and don't try to get it out of the .ttf file.
+// That's because getting it out of the .ttf file is really hard, because
+// the names in the file can appear in many possible encodings, in many
+// possible languages, and e.g. if you need a case-insensitive comparison,
+// the details of that depend on the encoding & language in a complex way
+// (actually underspecified in truetype, but also gigantic).
+//
+// But you can use the provided functions in two possible ways:
+//     stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
+//             unicode-encoded names to try to find the font you want;
+//             you can run this before calling stbtt_InitFont()
+//
+//     stbtt_GetFontNameString() lets you get any of the various strings
+//             from the file yourself and do your own comparisons on them.
+//             You have to have called stbtt_InitFont() first.
+
+
+STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
+// returns the offset (not index) of the font that matches, or -1 if none
+//   if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
+//   if you use any other flag, use a font name like "Arial"; this checks
+//     the 'macStyle' header field; i don't know if fonts set this consistently
+#define STBTT_MACSTYLE_DONTCARE     0
+#define STBTT_MACSTYLE_BOLD         1
+#define STBTT_MACSTYLE_ITALIC       2
+#define STBTT_MACSTYLE_UNDERSCORE   4
+#define STBTT_MACSTYLE_NONE         8   // <= not same as 0, this makes us check the bitfield is 0
+
+STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
+// returns 1/0 whether the first string interpreted as utf8 is identical to
+// the second string interpreted as big-endian utf16... useful for strings from next func
+
+STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
+// returns the string (which may be big-endian double byte, e.g. for unicode)
+// and puts the length in bytes in *length.
+//
+// some of the values for the IDs are below; for more see the truetype spec:
+//     http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
+//     http://www.microsoft.com/typography/otspec/name.htm
+
+enum { // platformID
+   STBTT_PLATFORM_ID_UNICODE   =0,
+   STBTT_PLATFORM_ID_MAC       =1,
+   STBTT_PLATFORM_ID_ISO       =2,
+   STBTT_PLATFORM_ID_MICROSOFT =3
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
+   STBTT_UNICODE_EID_UNICODE_1_0    =0,
+   STBTT_UNICODE_EID_UNICODE_1_1    =1,
+   STBTT_UNICODE_EID_ISO_10646      =2,
+   STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
+   STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
+   STBTT_MS_EID_SYMBOL        =0,
+   STBTT_MS_EID_UNICODE_BMP   =1,
+   STBTT_MS_EID_SHIFTJIS      =2,
+   STBTT_MS_EID_UNICODE_FULL  =10
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
+   STBTT_MAC_EID_ROMAN        =0,   STBTT_MAC_EID_ARABIC       =4,
+   STBTT_MAC_EID_JAPANESE     =1,   STBTT_MAC_EID_HEBREW       =5,
+   STBTT_MAC_EID_CHINESE_TRAD =2,   STBTT_MAC_EID_GREEK        =6,
+   STBTT_MAC_EID_KOREAN       =3,   STBTT_MAC_EID_RUSSIAN      =7
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
+       // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
+   STBTT_MS_LANG_ENGLISH     =0x0409,   STBTT_MS_LANG_ITALIAN     =0x0410,
+   STBTT_MS_LANG_CHINESE     =0x0804,   STBTT_MS_LANG_JAPANESE    =0x0411,
+   STBTT_MS_LANG_DUTCH       =0x0413,   STBTT_MS_LANG_KOREAN      =0x0412,
+   STBTT_MS_LANG_FRENCH      =0x040c,   STBTT_MS_LANG_RUSSIAN     =0x0419,
+   STBTT_MS_LANG_GERMAN      =0x0407,   STBTT_MS_LANG_SPANISH     =0x0409,
+   STBTT_MS_LANG_HEBREW      =0x040d,   STBTT_MS_LANG_SWEDISH     =0x041D
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MAC
+   STBTT_MAC_LANG_ENGLISH      =0 ,   STBTT_MAC_LANG_JAPANESE     =11,
+   STBTT_MAC_LANG_ARABIC       =12,   STBTT_MAC_LANG_KOREAN       =23,
+   STBTT_MAC_LANG_DUTCH        =4 ,   STBTT_MAC_LANG_RUSSIAN      =32,
+   STBTT_MAC_LANG_FRENCH       =1 ,   STBTT_MAC_LANG_SPANISH      =6 ,
+   STBTT_MAC_LANG_GERMAN       =2 ,   STBTT_MAC_LANG_SWEDISH      =5 ,
+   STBTT_MAC_LANG_HEBREW       =10,   STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
+   STBTT_MAC_LANG_ITALIAN      =3 ,   STBTT_MAC_LANG_CHINESE_TRAD =19
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __STB_INCLUDE_STB_TRUETYPE_H__
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+////   IMPLEMENTATION
+////
+////
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+
+#ifndef STBTT_MAX_OVERSAMPLE
+#define STBTT_MAX_OVERSAMPLE   8
+#endif
+
+#if STBTT_MAX_OVERSAMPLE > 255
+#error "STBTT_MAX_OVERSAMPLE cannot be > 255"
+#endif
+
+typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1];
+
+#ifndef STBTT_RASTERIZER_VERSION
+#define STBTT_RASTERIZER_VERSION 2
+#endif
+
+#ifdef _MSC_VER
+#define STBTT__NOTUSED(v)  (void)(v)
+#else
+#define STBTT__NOTUSED(v)  (void)sizeof(v)
+#endif
+
+//////////////////////////////////////////////////////////////////////////
+//
+// stbtt__buf helpers to parse data from file
+//
+
+static stbtt_uint8 stbtt__buf_get8(stbtt__buf *b)
+{
+   if (b->cursor >= b->size)
+      return 0;
+   return b->data[b->cursor++];
+}
+
+static stbtt_uint8 stbtt__buf_peek8(stbtt__buf *b)
+{
+   if (b->cursor >= b->size)
+      return 0;
+   return b->data[b->cursor];
+}
+
+static void stbtt__buf_seek(stbtt__buf *b, int o)
+{
+   STBTT_assert(!(o > b->size || o < 0));
+   b->cursor = (o > b->size || o < 0) ? b->size : o;
+}
+
+static void stbtt__buf_skip(stbtt__buf *b, int o)
+{
+   stbtt__buf_seek(b, b->cursor + o);
+}
+
+static stbtt_uint32 stbtt__buf_get(stbtt__buf *b, int n)
+{
+   stbtt_uint32 v = 0;
+   int i;
+   STBTT_assert(n >= 1 && n <= 4);
+   for (i = 0; i < n; i++)
+      v = (v << 8) | stbtt__buf_get8(b);
+   return v;
+}
+
+static stbtt__buf stbtt__new_buf(const void *p, size_t size)
+{
+   stbtt__buf r;
+   STBTT_assert(size < 0x40000000);
+   r.data = (stbtt_uint8*) p;
+   r.size = (int) size;
+   r.cursor = 0;
+   return r;
+}
+
+#define stbtt__buf_get16(b)  stbtt__buf_get((b), 2)
+#define stbtt__buf_get32(b)  stbtt__buf_get((b), 4)
+
+static stbtt__buf stbtt__buf_range(const stbtt__buf *b, int o, int s)
+{
+   stbtt__buf r = stbtt__new_buf(NULL, 0);
+   if (o < 0 || s < 0 || o > b->size || s > b->size - o) return r;
+   r.data = b->data + o;
+   r.size = s;
+   return r;
+}
+
+static stbtt__buf stbtt__cff_get_index(stbtt__buf *b)
+{
+   int count, start, offsize;
+   start = b->cursor;
+   count = stbtt__buf_get16(b);
+   if (count) {
+      offsize = stbtt__buf_get8(b);
+      STBTT_assert(offsize >= 1 && offsize <= 4);
+      stbtt__buf_skip(b, offsize * count);
+      stbtt__buf_skip(b, stbtt__buf_get(b, offsize) - 1);
+   }
+   return stbtt__buf_range(b, start, b->cursor - start);
+}
+
+static stbtt_uint32 stbtt__cff_int(stbtt__buf *b)
+{
+   int b0 = stbtt__buf_get8(b);
+   if (b0 >= 32 && b0 <= 246)       return b0 - 139;
+   else if (b0 >= 247 && b0 <= 250) return (b0 - 247)*256 + stbtt__buf_get8(b) + 108;
+   else if (b0 >= 251 && b0 <= 254) return -(b0 - 251)*256 - stbtt__buf_get8(b) - 108;
+   else if (b0 == 28)               return stbtt__buf_get16(b);
+   else if (b0 == 29)               return stbtt__buf_get32(b);
+   STBTT_assert(0);
+   return 0;
+}
+
+static void stbtt__cff_skip_operand(stbtt__buf *b) {
+   int v, b0 = stbtt__buf_peek8(b);
+   STBTT_assert(b0 >= 28);
+   if (b0 == 30) {
+      stbtt__buf_skip(b, 1);
+      while (b->cursor < b->size) {
+         v = stbtt__buf_get8(b);
+         if ((v & 0xF) == 0xF || (v >> 4) == 0xF)
+            break;
+      }
+   } else {
+      stbtt__cff_int(b);
+   }
+}
+
+static stbtt__buf stbtt__dict_get(stbtt__buf *b, int key)
+{
+   stbtt__buf_seek(b, 0);
+   while (b->cursor < b->size) {
+      int start = b->cursor, end, op;
+      while (stbtt__buf_peek8(b) >= 28)
+         stbtt__cff_skip_operand(b);
+      end = b->cursor;
+      op = stbtt__buf_get8(b);
+      if (op == 12)  op = stbtt__buf_get8(b) | 0x100;
+      if (op == key) return stbtt__buf_range(b, start, end-start);
+   }
+   return stbtt__buf_range(b, 0, 0);
+}
+
+static void stbtt__dict_get_ints(stbtt__buf *b, int key, int outcount, stbtt_uint32 *out)
+{
+   int i;
+   stbtt__buf operands = stbtt__dict_get(b, key);
+   for (i = 0; i < outcount && operands.cursor < operands.size; i++)
+      out[i] = stbtt__cff_int(&operands);
+}
+
+static int stbtt__cff_index_count(stbtt__buf *b)
+{
+   stbtt__buf_seek(b, 0);
+   return stbtt__buf_get16(b);
+}
+
+static stbtt__buf stbtt__cff_index_get(stbtt__buf b, int i)
+{
+   int count, offsize, start, end;
+   stbtt__buf_seek(&b, 0);
+   count = stbtt__buf_get16(&b);
+   offsize = stbtt__buf_get8(&b);
+   STBTT_assert(i >= 0 && i < count);
+   STBTT_assert(offsize >= 1 && offsize <= 4);
+   stbtt__buf_skip(&b, i*offsize);
+   start = stbtt__buf_get(&b, offsize);
+   end = stbtt__buf_get(&b, offsize);
+   return stbtt__buf_range(&b, 2+(count+1)*offsize+start, end - start);
+}
+
+//////////////////////////////////////////////////////////////////////////
+//
+// accessors to parse data from file
+//
+
+// on platforms that don't allow misaligned reads, if we want to allow
+// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE
+
+#define ttBYTE(p)     (* (stbtt_uint8 *) (p))
+#define ttCHAR(p)     (* (stbtt_int8 *) (p))
+#define ttFixed(p)    ttLONG(p)
+
+static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; }
+static stbtt_int16 ttSHORT(stbtt_uint8 *p)   { return p[0]*256 + p[1]; }
+static stbtt_uint32 ttULONG(stbtt_uint8 *p)  { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+static stbtt_int32 ttLONG(stbtt_uint8 *p)    { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+
+#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
+#define stbtt_tag(p,str)           stbtt_tag4(p,str[0],str[1],str[2],str[3])
+
+static int stbtt__isfont(stbtt_uint8 *font)
+{
+   // check the version number
+   if (stbtt_tag4(font, '1',0,0,0))  return 1; // TrueType 1
+   if (stbtt_tag(font, "typ1"))   return 1; // TrueType with type 1 font -- we don't support this!
+   if (stbtt_tag(font, "OTTO"))   return 1; // OpenType with CFF
+   if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
+   if (stbtt_tag(font, "true"))   return 1; // Apple specification for TrueType fonts
+   return 0;
+}
+
+// @OPTIMIZE: binary search
+static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
+{
+   stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
+   stbtt_uint32 tabledir = fontstart + 12;
+   stbtt_int32 i;
+   for (i=0; i < num_tables; ++i) {
+      stbtt_uint32 loc = tabledir + 16*i;
+      if (stbtt_tag(data+loc+0, tag))
+         return ttULONG(data+loc+8);
+   }
+   return 0;
+}
+
+static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index)
+{
+   // if it's just a font, there's only one valid index
+   if (stbtt__isfont(font_collection))
+      return index == 0 ? 0 : -1;
+
+   // check if it's a TTC
+   if (stbtt_tag(font_collection, "ttcf")) {
+      // version 1?
+      if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
+         stbtt_int32 n = ttLONG(font_collection+8);
+         if (index >= n)
+            return -1;
+         return ttULONG(font_collection+12+index*4);
+      }
+   }
+   return -1;
+}
+
+static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection)
+{
+   // if it's just a font, there's only one valid font
+   if (stbtt__isfont(font_collection))
+      return 1;
+
+   // check if it's a TTC
+   if (stbtt_tag(font_collection, "ttcf")) {
+      // version 1?
+      if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
+         return ttLONG(font_collection+8);
+      }
+   }
+   return 0;
+}
+
+static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict)
+{
+   stbtt_uint32 subrsoff = 0, private_loc[2] = { 0, 0 };
+   stbtt__buf pdict;
+   stbtt__dict_get_ints(&fontdict, 18, 2, private_loc);
+   if (!private_loc[1] || !private_loc[0]) return stbtt__new_buf(NULL, 0);
+   pdict = stbtt__buf_range(&cff, private_loc[1], private_loc[0]);
+   stbtt__dict_get_ints(&pdict, 19, 1, &subrsoff);
+   if (!subrsoff) return stbtt__new_buf(NULL, 0);
+   stbtt__buf_seek(&cff, private_loc[1]+subrsoff);
+   return stbtt__cff_get_index(&cff);
+}
+
+// since most people won't use this, find this table the first time it's needed
+static int stbtt__get_svg(stbtt_fontinfo *info)
+{
+   stbtt_uint32 t;
+   if (info->svg < 0) {
+      t = stbtt__find_table(info->data, info->fontstart, "SVG ");
+      if (t) {
+         stbtt_uint32 offset = ttULONG(info->data + t + 2);
+         info->svg = t + offset;
+      } else {
+         info->svg = 0;
+      }
+   }
+   return info->svg;
+}
+
+static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart)
+{
+   stbtt_uint32 cmap, t;
+   stbtt_int32 i,numTables;
+
+   info->data = data;
+   info->fontstart = fontstart;
+   info->cff = stbtt__new_buf(NULL, 0);
+
+   cmap = stbtt__find_table(data, fontstart, "cmap");       // required
+   info->loca = stbtt__find_table(data, fontstart, "loca"); // required
+   info->head = stbtt__find_table(data, fontstart, "head"); // required
+   info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
+   info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
+   info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
+   info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
+   info->gpos = stbtt__find_table(data, fontstart, "GPOS"); // not required
+
+   if (!cmap || !info->head || !info->hhea || !info->hmtx)
+      return 0;
+   if (info->glyf) {
+      // required for truetype
+      if (!info->loca) return 0;
+   } else {
+      // initialization for CFF / Type2 fonts (OTF)
+      stbtt__buf b, topdict, topdictidx;
+      stbtt_uint32 cstype = 2, charstrings = 0, fdarrayoff = 0, fdselectoff = 0;
+      stbtt_uint32 cff;
+
+      cff = stbtt__find_table(data, fontstart, "CFF ");
+      if (!cff) return 0;
+
+      info->fontdicts = stbtt__new_buf(NULL, 0);
+      info->fdselect = stbtt__new_buf(NULL, 0);
+
+      // @TODO this should use size from table (not 512MB)
+      info->cff = stbtt__new_buf(data+cff, 512*1024*1024);
+      b = info->cff;
+
+      // read the header
+      stbtt__buf_skip(&b, 2);
+      stbtt__buf_seek(&b, stbtt__buf_get8(&b)); // hdrsize
+
+      // @TODO the name INDEX could list multiple fonts,
+      // but we just use the first one.
+      stbtt__cff_get_index(&b);  // name INDEX
+      topdictidx = stbtt__cff_get_index(&b);
+      topdict = stbtt__cff_index_get(topdictidx, 0);
+      stbtt__cff_get_index(&b);  // string INDEX
+      info->gsubrs = stbtt__cff_get_index(&b);
+
+      stbtt__dict_get_ints(&topdict, 17, 1, &charstrings);
+      stbtt__dict_get_ints(&topdict, 0x100 | 6, 1, &cstype);
+      stbtt__dict_get_ints(&topdict, 0x100 | 36, 1, &fdarrayoff);
+      stbtt__dict_get_ints(&topdict, 0x100 | 37, 1, &fdselectoff);
+      info->subrs = stbtt__get_subrs(b, topdict);
+
+      // we only support Type 2 charstrings
+      if (cstype != 2) return 0;
+      if (charstrings == 0) return 0;
+
+      if (fdarrayoff) {
+         // looks like a CID font
+         if (!fdselectoff) return 0;
+         stbtt__buf_seek(&b, fdarrayoff);
+         info->fontdicts = stbtt__cff_get_index(&b);
+         info->fdselect = stbtt__buf_range(&b, fdselectoff, b.size-fdselectoff);
+      }
+
+      stbtt__buf_seek(&b, charstrings);
+      info->charstrings = stbtt__cff_get_index(&b);
+   }
+
+   t = stbtt__find_table(data, fontstart, "maxp");
+   if (t)
+      info->numGlyphs = ttUSHORT(data+t+4);
+   else
+      info->numGlyphs = 0xffff;
+
+   info->svg = -1;
+
+   // find a cmap encoding table we understand *now* to avoid searching
+   // later. (todo: could make this installable)
+   // the same regardless of glyph.
+   numTables = ttUSHORT(data + cmap + 2);
+   info->index_map = 0;
+   for (i=0; i < numTables; ++i) {
+      stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
+      // find an encoding we understand:
+      switch(ttUSHORT(data+encoding_record)) {
+         case STBTT_PLATFORM_ID_MICROSOFT:
+            switch (ttUSHORT(data+encoding_record+2)) {
+               case STBTT_MS_EID_UNICODE_BMP:
+               case STBTT_MS_EID_UNICODE_FULL:
+                  // MS/Unicode
+                  info->index_map = cmap + ttULONG(data+encoding_record+4);
+                  break;
+            }
+            break;
+        case STBTT_PLATFORM_ID_UNICODE:
+            // Mac/iOS has these
+            // all the encodingIDs are unicode, so we don't bother to check it
+            info->index_map = cmap + ttULONG(data+encoding_record+4);
+            break;
+      }
+   }
+   if (info->index_map == 0)
+      return 0;
+
+   info->indexToLocFormat = ttUSHORT(data+info->head + 50);
+   return 1;
+}
+
+STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
+{
+   stbtt_uint8 *data = info->data;
+   stbtt_uint32 index_map = info->index_map;
+
+   stbtt_uint16 format = ttUSHORT(data + index_map + 0);
+   if (format == 0) { // apple byte encoding
+      stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
+      if (unicode_codepoint < bytes-6)
+         return ttBYTE(data + index_map + 6 + unicode_codepoint);
+      return 0;
+   } else if (format == 6) {
+      stbtt_uint32 first = ttUSHORT(data + index_map + 6);
+      stbtt_uint32 count = ttUSHORT(data + index_map + 8);
+      if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
+         return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
+      return 0;
+   } else if (format == 2) {
+      STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
+      return 0;
+   } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
+      stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
+      stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
+      stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
+      stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
+
+      // do a binary search of the segments
+      stbtt_uint32 endCount = index_map + 14;
+      stbtt_uint32 search = endCount;
+
+      if (unicode_codepoint > 0xffff)
+         return 0;
+
+      // they lie from endCount .. endCount + segCount
+      // but searchRange is the nearest power of two, so...
+      if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
+         search += rangeShift*2;
+
+      // now decrement to bias correctly to find smallest
+      search -= 2;
+      while (entrySelector) {
+         stbtt_uint16 end;
+         searchRange >>= 1;
+         end = ttUSHORT(data + search + searchRange*2);
+         if (unicode_codepoint > end)
+            search += searchRange*2;
+         --entrySelector;
+      }
+      search += 2;
+
+      {
+         stbtt_uint16 offset, start, last;
+         stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
+
+         start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
+         last = ttUSHORT(data + endCount + 2*item);
+         if (unicode_codepoint < start || unicode_codepoint > last)
+            return 0;
+
+         offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
+         if (offset == 0)
+            return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));
+
+         return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
+      }
+   } else if (format == 12 || format == 13) {
+      stbtt_uint32 ngroups = ttULONG(data+index_map+12);
+      stbtt_int32 low,high;
+      low = 0; high = (stbtt_int32)ngroups;
+      // Binary search the right group.
+      while (low < high) {
+         stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
+         stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
+         stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
+         if ((stbtt_uint32) unicode_codepoint < start_char)
+            high = mid;
+         else if ((stbtt_uint32) unicode_codepoint > end_char)
+            low = mid+1;
+         else {
+            stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
+            if (format == 12)
+               return start_glyph + unicode_codepoint-start_char;
+            else // format == 13
+               return start_glyph;
+         }
+      }
+      return 0; // not found
+   }
+   // @TODO
+   STBTT_assert(0);
+   return 0;
+}
+
+STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
+{
+   return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
+}
+
+static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
+{
+   v->type = type;
+   v->x = (stbtt_int16) x;
+   v->y = (stbtt_int16) y;
+   v->cx = (stbtt_int16) cx;
+   v->cy = (stbtt_int16) cy;
+}
+
+static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
+{
+   int g1,g2;
+
+   STBTT_assert(!info->cff.size);
+
+   if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
+   if (info->indexToLocFormat >= 2)    return -1; // unknown index->glyph map format
+
+   if (info->indexToLocFormat == 0) {
+      g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
+      g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
+   } else {
+      g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
+      g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
+   }
+
+   return g1==g2 ? -1 : g1; // if length is 0, return -1
+}
+
+static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
+
+STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
+{
+   if (info->cff.size) {
+      stbtt__GetGlyphInfoT2(info, glyph_index, x0, y0, x1, y1);
+   } else {
+      int g = stbtt__GetGlyfOffset(info, glyph_index);
+      if (g < 0) return 0;
+
+      if (x0) *x0 = ttSHORT(info->data + g + 2);
+      if (y0) *y0 = ttSHORT(info->data + g + 4);
+      if (x1) *x1 = ttSHORT(info->data + g + 6);
+      if (y1) *y1 = ttSHORT(info->data + g + 8);
+   }
+   return 1;
+}
+
+STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
+{
+   return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
+}
+
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
+{
+   stbtt_int16 numberOfContours;
+   int g;
+   if (info->cff.size)
+      return stbtt__GetGlyphInfoT2(info, glyph_index, NULL, NULL, NULL, NULL) == 0;
+   g = stbtt__GetGlyfOffset(info, glyph_index);
+   if (g < 0) return 1;
+   numberOfContours = ttSHORT(info->data + g);
+   return numberOfContours == 0;
+}
+
+static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
+    stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
+{
+   if (start_off) {
+      if (was_off)
+         stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
+      stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
+   } else {
+      if (was_off)
+         stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
+      else
+         stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
+   }
+   return num_vertices;
+}
+
+static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+   stbtt_int16 numberOfContours;
+   stbtt_uint8 *endPtsOfContours;
+   stbtt_uint8 *data = info->data;
+   stbtt_vertex *vertices=0;
+   int num_vertices=0;
+   int g = stbtt__GetGlyfOffset(info, glyph_index);
+
+   *pvertices = NULL;
+
+   if (g < 0) return 0;
+
+   numberOfContours = ttSHORT(data + g);
+
+   if (numberOfContours > 0) {
+      stbtt_uint8 flags=0,flagcount;
+      stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
+      stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
+      stbtt_uint8 *points;
+      endPtsOfContours = (data + g + 10);
+      ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
+      points = data + g + 10 + numberOfContours * 2 + 2 + ins;
+
+      n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
+
+      m = n + 2*numberOfContours;  // a loose bound on how many vertices we might need
+      vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
+      if (vertices == 0)
+         return 0;
+
+      next_move = 0;
+      flagcount=0;
+
+      // in first pass, we load uninterpreted data into the allocated array
+      // above, shifted to the end of the array so we won't overwrite it when
+      // we create our final data starting from the front
+
+      off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated
+
+      // first load flags
+
+      for (i=0; i < n; ++i) {
+         if (flagcount == 0) {
+            flags = *points++;
+            if (flags & 8)
+               flagcount = *points++;
+         } else
+            --flagcount;
+         vertices[off+i].type = flags;
+      }
+
+      // now load x coordinates
+      x=0;
+      for (i=0; i < n; ++i) {
+         flags = vertices[off+i].type;
+         if (flags & 2) {
+            stbtt_int16 dx = *points++;
+            x += (flags & 16) ? dx : -dx; // ???
+         } else {
+            if (!(flags & 16)) {
+               x = x + (stbtt_int16) (points[0]*256 + points[1]);
+               points += 2;
+            }
+         }
+         vertices[off+i].x = (stbtt_int16) x;
+      }
+
+      // now load y coordinates
+      y=0;
+      for (i=0; i < n; ++i) {
+         flags = vertices[off+i].type;
+         if (flags & 4) {
+            stbtt_int16 dy = *points++;
+            y += (flags & 32) ? dy : -dy; // ???
+         } else {
+            if (!(flags & 32)) {
+               y = y + (stbtt_int16) (points[0]*256 + points[1]);
+               points += 2;
+            }
+         }
+         vertices[off+i].y = (stbtt_int16) y;
+      }
+
+      // now convert them to our format
+      num_vertices=0;
+      sx = sy = cx = cy = scx = scy = 0;
+      for (i=0; i < n; ++i) {
+         flags = vertices[off+i].type;
+         x     = (stbtt_int16) vertices[off+i].x;
+         y     = (stbtt_int16) vertices[off+i].y;
+
+         if (next_move == i) {
+            if (i != 0)
+               num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+
+            // now start the new one
+            start_off = !(flags & 1);
+            if (start_off) {
+               // if we start off with an off-curve point, then when we need to find a point on the curve
+               // where we can start, and we need to save some state for when we wraparound.
+               scx = x;
+               scy = y;
+               if (!(vertices[off+i+1].type & 1)) {
+                  // next point is also a curve point, so interpolate an on-point curve
+                  sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
+                  sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
+               } else {
+                  // otherwise just use the next point as our start point
+                  sx = (stbtt_int32) vertices[off+i+1].x;
+                  sy = (stbtt_int32) vertices[off+i+1].y;
+                  ++i; // we're using point i+1 as the starting point, so skip it
+               }
+            } else {
+               sx = x;
+               sy = y;
+            }
+            stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
+            was_off = 0;
+            next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
+            ++j;
+         } else {
+            if (!(flags & 1)) { // if it's a curve
+               if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
+                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
+               cx = x;
+               cy = y;
+               was_off = 1;
+            } else {
+               if (was_off)
+                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
+               else
+                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
+               was_off = 0;
+            }
+         }
+      }
+      num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+   } else if (numberOfContours < 0) {
+      // Compound shapes.
+      int more = 1;
+      stbtt_uint8 *comp = data + g + 10;
+      num_vertices = 0;
+      vertices = 0;
+      while (more) {
+         stbtt_uint16 flags, gidx;
+         int comp_num_verts = 0, i;
+         stbtt_vertex *comp_verts = 0, *tmp = 0;
+         float mtx[6] = {1,0,0,1,0,0}, m, n;
+
+         flags = ttSHORT(comp); comp+=2;
+         gidx = ttSHORT(comp); comp+=2;
+
+         if (flags & 2) { // XY values
+            if (flags & 1) { // shorts
+               mtx[4] = ttSHORT(comp); comp+=2;
+               mtx[5] = ttSHORT(comp); comp+=2;
+            } else {
+               mtx[4] = ttCHAR(comp); comp+=1;
+               mtx[5] = ttCHAR(comp); comp+=1;
+            }
+         }
+         else {
+            // @TODO handle matching point
+            STBTT_assert(0);
+         }
+         if (flags & (1<<3)) { // WE_HAVE_A_SCALE
+            mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[1] = mtx[2] = 0;
+         } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
+            mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[1] = mtx[2] = 0;
+            mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+         } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
+            mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+         }
+
+         // Find transformation scales.
+         m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
+         n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
+
+         // Get indexed glyph.
+         comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
+         if (comp_num_verts > 0) {
+            // Transform vertices.
+            for (i = 0; i < comp_num_verts; ++i) {
+               stbtt_vertex* v = &comp_verts[i];
+               stbtt_vertex_type x,y;
+               x=v->x; y=v->y;
+               v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+               v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+               x=v->cx; y=v->cy;
+               v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+               v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+            }
+            // Append vertices.
+            tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
+            if (!tmp) {
+               if (vertices) STBTT_free(vertices, info->userdata);
+               if (comp_verts) STBTT_free(comp_verts, info->userdata);
+               return 0;
+            }
+            if (num_vertices > 0 && vertices) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
+            STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
+            if (vertices) STBTT_free(vertices, info->userdata);
+            vertices = tmp;
+            STBTT_free(comp_verts, info->userdata);
+            num_vertices += comp_num_verts;
+         }
+         // More components ?
+         more = flags & (1<<5);
+      }
+   } else {
+      // numberOfCounters == 0, do nothing
+   }
+
+   *pvertices = vertices;
+   return num_vertices;
+}
+
+typedef struct
+{
+   int bounds;
+   int started;
+   float first_x, first_y;
+   float x, y;
+   stbtt_int32 min_x, max_x, min_y, max_y;
+
+   stbtt_vertex *pvertices;
+   int num_vertices;
+} stbtt__csctx;
+
+#define STBTT__CSCTX_INIT(bounds) {bounds,0, 0,0, 0,0, 0,0,0,0, NULL, 0}
+
+static void stbtt__track_vertex(stbtt__csctx *c, stbtt_int32 x, stbtt_int32 y)
+{
+   if (x > c->max_x || !c->started) c->max_x = x;
+   if (y > c->max_y || !c->started) c->max_y = y;
+   if (x < c->min_x || !c->started) c->min_x = x;
+   if (y < c->min_y || !c->started) c->min_y = y;
+   c->started = 1;
+}
+
+static void stbtt__csctx_v(stbtt__csctx *c, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy, stbtt_int32 cx1, stbtt_int32 cy1)
+{
+   if (c->bounds) {
+      stbtt__track_vertex(c, x, y);
+      if (type == STBTT_vcubic) {
+         stbtt__track_vertex(c, cx, cy);
+         stbtt__track_vertex(c, cx1, cy1);
+      }
+   } else {
+      stbtt_setvertex(&c->pvertices[c->num_vertices], type, x, y, cx, cy);
+      c->pvertices[c->num_vertices].cx1 = (stbtt_int16) cx1;
+      c->pvertices[c->num_vertices].cy1 = (stbtt_int16) cy1;
+   }
+   c->num_vertices++;
+}
+
+static void stbtt__csctx_close_shape(stbtt__csctx *ctx)
+{
+   if (ctx->first_x != ctx->x || ctx->first_y != ctx->y)
+      stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->first_x, (int)ctx->first_y, 0, 0, 0, 0);
+}
+
+static void stbtt__csctx_rmove_to(stbtt__csctx *ctx, float dx, float dy)
+{
+   stbtt__csctx_close_shape(ctx);
+   ctx->first_x = ctx->x = ctx->x + dx;
+   ctx->first_y = ctx->y = ctx->y + dy;
+   stbtt__csctx_v(ctx, STBTT_vmove, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0);
+}
+
+static void stbtt__csctx_rline_to(stbtt__csctx *ctx, float dx, float dy)
+{
+   ctx->x += dx;
+   ctx->y += dy;
+   stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0);
+}
+
+static void stbtt__csctx_rccurve_to(stbtt__csctx *ctx, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3)
+{
+   float cx1 = ctx->x + dx1;
+   float cy1 = ctx->y + dy1;
+   float cx2 = cx1 + dx2;
+   float cy2 = cy1 + dy2;
+   ctx->x = cx2 + dx3;
+   ctx->y = cy2 + dy3;
+   stbtt__csctx_v(ctx, STBTT_vcubic, (int)ctx->x, (int)ctx->y, (int)cx1, (int)cy1, (int)cx2, (int)cy2);
+}
+
+static stbtt__buf stbtt__get_subr(stbtt__buf idx, int n)
+{
+   int count = stbtt__cff_index_count(&idx);
+   int bias = 107;
+   if (count >= 33900)
+      bias = 32768;
+   else if (count >= 1240)
+      bias = 1131;
+   n += bias;
+   if (n < 0 || n >= count)
+      return stbtt__new_buf(NULL, 0);
+   return stbtt__cff_index_get(idx, n);
+}
+
+static stbtt__buf stbtt__cid_get_glyph_subrs(const stbtt_fontinfo *info, int glyph_index)
+{
+   stbtt__buf fdselect = info->fdselect;
+   int nranges, start, end, v, fmt, fdselector = -1, i;
+
+   stbtt__buf_seek(&fdselect, 0);
+   fmt = stbtt__buf_get8(&fdselect);
+   if (fmt == 0) {
+      // untested
+      stbtt__buf_skip(&fdselect, glyph_index);
+      fdselector = stbtt__buf_get8(&fdselect);
+   } else if (fmt == 3) {
+      nranges = stbtt__buf_get16(&fdselect);
+      start = stbtt__buf_get16(&fdselect);
+      for (i = 0; i < nranges; i++) {
+         v = stbtt__buf_get8(&fdselect);
+         end = stbtt__buf_get16(&fdselect);
+         if (glyph_index >= start && glyph_index < end) {
+            fdselector = v;
+            break;
+         }
+         start = end;
+      }
+   }
+   if (fdselector == -1) stbtt__new_buf(NULL, 0);
+   return stbtt__get_subrs(info->cff, stbtt__cff_index_get(info->fontdicts, fdselector));
+}
+
+static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, stbtt__csctx *c)
+{
+   int in_header = 1, maskbits = 0, subr_stack_height = 0, sp = 0, v, i, b0;
+   int has_subrs = 0, clear_stack;
+   float s[48];
+   stbtt__buf subr_stack[10], subrs = info->subrs, b;
+   float f;
+
+#define STBTT__CSERR(s) (0)
+
+   // this currently ignores the initial width value, which isn't needed if we have hmtx
+   b = stbtt__cff_index_get(info->charstrings, glyph_index);
+   while (b.cursor < b.size) {
+      i = 0;
+      clear_stack = 1;
+      b0 = stbtt__buf_get8(&b);
+      switch (b0) {
+      // @TODO implement hinting
+      case 0x13: // hintmask
+      case 0x14: // cntrmask
+         if (in_header)
+            maskbits += (sp / 2); // implicit "vstem"
+         in_header = 0;
+         stbtt__buf_skip(&b, (maskbits + 7) / 8);
+         break;
+
+      case 0x01: // hstem
+      case 0x03: // vstem
+      case 0x12: // hstemhm
+      case 0x17: // vstemhm
+         maskbits += (sp / 2);
+         break;
+
+      case 0x15: // rmoveto
+         in_header = 0;
+         if (sp < 2) return STBTT__CSERR("rmoveto stack");
+         stbtt__csctx_rmove_to(c, s[sp-2], s[sp-1]);
+         break;
+      case 0x04: // vmoveto
+         in_header = 0;
+         if (sp < 1) return STBTT__CSERR("vmoveto stack");
+         stbtt__csctx_rmove_to(c, 0, s[sp-1]);
+         break;
+      case 0x16: // hmoveto
+         in_header = 0;
+         if (sp < 1) return STBTT__CSERR("hmoveto stack");
+         stbtt__csctx_rmove_to(c, s[sp-1], 0);
+         break;
+
+      case 0x05: // rlineto
+         if (sp < 2) return STBTT__CSERR("rlineto stack");
+         for (; i + 1 < sp; i += 2)
+            stbtt__csctx_rline_to(c, s[i], s[i+1]);
+         break;
+
+      // hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical
+      // starting from a different place.
+
+      case 0x07: // vlineto
+         if (sp < 1) return STBTT__CSERR("vlineto stack");
+         goto vlineto;
+      case 0x06: // hlineto
+         if (sp < 1) return STBTT__CSERR("hlineto stack");
+         for (;;) {
+            if (i >= sp) break;
+            stbtt__csctx_rline_to(c, s[i], 0);
+            i++;
+      vlineto:
+            if (i >= sp) break;
+            stbtt__csctx_rline_to(c, 0, s[i]);
+            i++;
+         }
+         break;
+
+      case 0x1F: // hvcurveto
+         if (sp < 4) return STBTT__CSERR("hvcurveto stack");
+         goto hvcurveto;
+      case 0x1E: // vhcurveto
+         if (sp < 4) return STBTT__CSERR("vhcurveto stack");
+         for (;;) {
+            if (i + 3 >= sp) break;
+            stbtt__csctx_rccurve_to(c, 0, s[i], s[i+1], s[i+2], s[i+3], (sp - i == 5) ? s[i + 4] : 0.0f);
+            i += 4;
+      hvcurveto:
+            if (i + 3 >= sp) break;
+            stbtt__csctx_rccurve_to(c, s[i], 0, s[i+1], s[i+2], (sp - i == 5) ? s[i+4] : 0.0f, s[i+3]);
+            i += 4;
+         }
+         break;
+
+      case 0x08: // rrcurveto
+         if (sp < 6) return STBTT__CSERR("rcurveline stack");
+         for (; i + 5 < sp; i += 6)
+            stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
+         break;
+
+      case 0x18: // rcurveline
+         if (sp < 8) return STBTT__CSERR("rcurveline stack");
+         for (; i + 5 < sp - 2; i += 6)
+            stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
+         if (i + 1 >= sp) return STBTT__CSERR("rcurveline stack");
+         stbtt__csctx_rline_to(c, s[i], s[i+1]);
+         break;
+
+      case 0x19: // rlinecurve
+         if (sp < 8) return STBTT__CSERR("rlinecurve stack");
+         for (; i + 1 < sp - 6; i += 2)
+            stbtt__csctx_rline_to(c, s[i], s[i+1]);
+         if (i + 5 >= sp) return STBTT__CSERR("rlinecurve stack");
+         stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
+         break;
+
+      case 0x1A: // vvcurveto
+      case 0x1B: // hhcurveto
+         if (sp < 4) return STBTT__CSERR("(vv|hh)curveto stack");
+         f = 0.0;
+         if (sp & 1) { f = s[i]; i++; }
+         for (; i + 3 < sp; i += 4) {
+            if (b0 == 0x1B)
+               stbtt__csctx_rccurve_to(c, s[i], f, s[i+1], s[i+2], s[i+3], 0.0);
+            else
+               stbtt__csctx_rccurve_to(c, f, s[i], s[i+1], s[i+2], 0.0, s[i+3]);
+            f = 0.0;
+         }
+         break;
+
+      case 0x0A: // callsubr
+         if (!has_subrs) {
+            if (info->fdselect.size)
+               subrs = stbtt__cid_get_glyph_subrs(info, glyph_index);
+            has_subrs = 1;
+         }
+         // FALLTHROUGH
+      case 0x1D: // callgsubr
+         if (sp < 1) return STBTT__CSERR("call(g|)subr stack");
+         v = (int) s[--sp];
+         if (subr_stack_height >= 10) return STBTT__CSERR("recursion limit");
+         subr_stack[subr_stack_height++] = b;
+         b = stbtt__get_subr(b0 == 0x0A ? subrs : info->gsubrs, v);
+         if (b.size == 0) return STBTT__CSERR("subr not found");
+         b.cursor = 0;
+         clear_stack = 0;
+         break;
+
+      case 0x0B: // return
+         if (subr_stack_height <= 0) return STBTT__CSERR("return outside subr");
+         b = subr_stack[--subr_stack_height];
+         clear_stack = 0;
+         break;
+
+      case 0x0E: // endchar
+         stbtt__csctx_close_shape(c);
+         return 1;
+
+      case 0x0C: { // two-byte escape
+         float dx1, dx2, dx3, dx4, dx5, dx6, dy1, dy2, dy3, dy4, dy5, dy6;
+         float dx, dy;
+         int b1 = stbtt__buf_get8(&b);
+         switch (b1) {
+         // @TODO These "flex" implementations ignore the flex-depth and resolution,
+         // and always draw beziers.
+         case 0x22: // hflex
+            if (sp < 7) return STBTT__CSERR("hflex stack");
+            dx1 = s[0];
+            dx2 = s[1];
+            dy2 = s[2];
+            dx3 = s[3];
+            dx4 = s[4];
+            dx5 = s[5];
+            dx6 = s[6];
+            stbtt__csctx_rccurve_to(c, dx1, 0, dx2, dy2, dx3, 0);
+            stbtt__csctx_rccurve_to(c, dx4, 0, dx5, -dy2, dx6, 0);
+            break;
+
+         case 0x23: // flex
+            if (sp < 13) return STBTT__CSERR("flex stack");
+            dx1 = s[0];
+            dy1 = s[1];
+            dx2 = s[2];
+            dy2 = s[3];
+            dx3 = s[4];
+            dy3 = s[5];
+            dx4 = s[6];
+            dy4 = s[7];
+            dx5 = s[8];
+            dy5 = s[9];
+            dx6 = s[10];
+            dy6 = s[11];
+            //fd is s[12]
+            stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3);
+            stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6);
+            break;
+
+         case 0x24: // hflex1
+            if (sp < 9) return STBTT__CSERR("hflex1 stack");
+            dx1 = s[0];
+            dy1 = s[1];
+            dx2 = s[2];
+            dy2 = s[3];
+            dx3 = s[4];
+            dx4 = s[5];
+            dx5 = s[6];
+            dy5 = s[7];
+            dx6 = s[8];
+            stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, 0);
+            stbtt__csctx_rccurve_to(c, dx4, 0, dx5, dy5, dx6, -(dy1+dy2+dy5));
+            break;
+
+         case 0x25: // flex1
+            if (sp < 11) return STBTT__CSERR("flex1 stack");
+            dx1 = s[0];
+            dy1 = s[1];
+            dx2 = s[2];
+            dy2 = s[3];
+            dx3 = s[4];
+            dy3 = s[5];
+            dx4 = s[6];
+            dy4 = s[7];
+            dx5 = s[8];
+            dy5 = s[9];
+            dx6 = dy6 = s[10];
+            dx = dx1+dx2+dx3+dx4+dx5;
+            dy = dy1+dy2+dy3+dy4+dy5;
+            if (STBTT_fabs(dx) > STBTT_fabs(dy))
+               dy6 = -dy;
+            else
+               dx6 = -dx;
+            stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3);
+            stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6);
+            break;
+
+         default:
+            return STBTT__CSERR("unimplemented");
+         }
+      } break;
+
+      default:
+         if (b0 != 255 && b0 != 28 && b0 < 32)
+            return STBTT__CSERR("reserved operator");
+
+         // push immediate
+         if (b0 == 255) {
+            f = (float)(stbtt_int32)stbtt__buf_get32(&b) / 0x10000;
+         } else {
+            stbtt__buf_skip(&b, -1);
+            f = (float)(stbtt_int16)stbtt__cff_int(&b);
+         }
+         if (sp >= 48) return STBTT__CSERR("push stack overflow");
+         s[sp++] = f;
+         clear_stack = 0;
+         break;
+      }
+      if (clear_stack) sp = 0;
+   }
+   return STBTT__CSERR("no endchar");
+
+#undef STBTT__CSERR
+}
+
+static int stbtt__GetGlyphShapeT2(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+   // runs the charstring twice, once to count and once to output (to avoid realloc)
+   stbtt__csctx count_ctx = STBTT__CSCTX_INIT(1);
+   stbtt__csctx output_ctx = STBTT__CSCTX_INIT(0);
+   if (stbtt__run_charstring(info, glyph_index, &count_ctx)) {
+      *pvertices = (stbtt_vertex*)STBTT_malloc(count_ctx.num_vertices*sizeof(stbtt_vertex), info->userdata);
+      output_ctx.pvertices = *pvertices;
+      if (stbtt__run_charstring(info, glyph_index, &output_ctx)) {
+         STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices);
+         return output_ctx.num_vertices;
+      }
+   }
+   *pvertices = NULL;
+   return 0;
+}
+
+static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
+{
+   stbtt__csctx c = STBTT__CSCTX_INIT(1);
+   int r = stbtt__run_charstring(info, glyph_index, &c);
+   if (x0)  *x0 = r ? c.min_x : 0;
+   if (y0)  *y0 = r ? c.min_y : 0;
+   if (x1)  *x1 = r ? c.max_x : 0;
+   if (y1)  *y1 = r ? c.max_y : 0;
+   return r ? c.num_vertices : 0;
+}
+
+STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+   if (!info->cff.size)
+      return stbtt__GetGlyphShapeTT(info, glyph_index, pvertices);
+   else
+      return stbtt__GetGlyphShapeT2(info, glyph_index, pvertices);
+}
+
+STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
+{
+   stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
+   if (glyph_index < numOfLongHorMetrics) {
+      if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*glyph_index);
+      if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
+   } else {
+      if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
+      if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
+   }
+}
+
+STBTT_DEF int  stbtt_GetKerningTableLength(const stbtt_fontinfo *info)
+{
+   stbtt_uint8 *data = info->data + info->kern;
+
+   // we only look at the first table. it must be 'horizontal' and format 0.
+   if (!info->kern)
+      return 0;
+   if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+      return 0;
+   if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+      return 0;
+
+   return ttUSHORT(data+10);
+}
+
+STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length)
+{
+   stbtt_uint8 *data = info->data + info->kern;
+   int k, length;
+
+   // we only look at the first table. it must be 'horizontal' and format 0.
+   if (!info->kern)
+      return 0;
+   if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+      return 0;
+   if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+      return 0;
+
+   length = ttUSHORT(data+10);
+   if (table_length < length)
+      length = table_length;
+
+   for (k = 0; k < length; k++)
+   {
+      table[k].glyph1 = ttUSHORT(data+18+(k*6));
+      table[k].glyph2 = ttUSHORT(data+20+(k*6));
+      table[k].advance = ttSHORT(data+22+(k*6));
+   }
+
+   return length;
+}
+
+static int stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+{
+   stbtt_uint8 *data = info->data + info->kern;
+   stbtt_uint32 needle, straw;
+   int l, r, m;
+
+   // we only look at the first table. it must be 'horizontal' and format 0.
+   if (!info->kern)
+      return 0;
+   if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+      return 0;
+   if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+      return 0;
+
+   l = 0;
+   r = ttUSHORT(data+10) - 1;
+   needle = glyph1 << 16 | glyph2;
+   while (l <= r) {
+      m = (l + r) >> 1;
+      straw = ttULONG(data+18+(m*6)); // note: unaligned read
+      if (needle < straw)
+         r = m - 1;
+      else if (needle > straw)
+         l = m + 1;
+      else
+         return ttSHORT(data+22+(m*6));
+   }
+   return 0;
+}
+
+static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph)
+{
+   stbtt_uint16 coverageFormat = ttUSHORT(coverageTable);
+   switch (coverageFormat) {
+      case 1: {
+         stbtt_uint16 glyphCount = ttUSHORT(coverageTable + 2);
+
+         // Binary search.
+         stbtt_int32 l=0, r=glyphCount-1, m;
+         int straw, needle=glyph;
+         while (l <= r) {
+            stbtt_uint8 *glyphArray = coverageTable + 4;
+            stbtt_uint16 glyphID;
+            m = (l + r) >> 1;
+            glyphID = ttUSHORT(glyphArray + 2 * m);
+            straw = glyphID;
+            if (needle < straw)
+               r = m - 1;
+            else if (needle > straw)
+               l = m + 1;
+            else {
+               return m;
+            }
+         }
+         break;
+      }
+
+      case 2: {
+         stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2);
+         stbtt_uint8 *rangeArray = coverageTable + 4;
+
+         // Binary search.
+         stbtt_int32 l=0, r=rangeCount-1, m;
+         int strawStart, strawEnd, needle=glyph;
+         while (l <= r) {
+            stbtt_uint8 *rangeRecord;
+            m = (l + r) >> 1;
+            rangeRecord = rangeArray + 6 * m;
+            strawStart = ttUSHORT(rangeRecord);
+            strawEnd = ttUSHORT(rangeRecord + 2);
+            if (needle < strawStart)
+               r = m - 1;
+            else if (needle > strawEnd)
+               l = m + 1;
+            else {
+               stbtt_uint16 startCoverageIndex = ttUSHORT(rangeRecord + 4);
+               return startCoverageIndex + glyph - strawStart;
+            }
+         }
+         break;
+      }
+
+      default: return -1; // unsupported
+   }
+
+   return -1;
+}
+
+static stbtt_int32  stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
+{
+   stbtt_uint16 classDefFormat = ttUSHORT(classDefTable);
+   switch (classDefFormat)
+   {
+      case 1: {
+         stbtt_uint16 startGlyphID = ttUSHORT(classDefTable + 2);
+         stbtt_uint16 glyphCount = ttUSHORT(classDefTable + 4);
+         stbtt_uint8 *classDef1ValueArray = classDefTable + 6;
+
+         if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount)
+            return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID));
+         break;
+      }
+
+      case 2: {
+         stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2);
+         stbtt_uint8 *classRangeRecords = classDefTable + 4;
+
+         // Binary search.
+         stbtt_int32 l=0, r=classRangeCount-1, m;
+         int strawStart, strawEnd, needle=glyph;
+         while (l <= r) {
+            stbtt_uint8 *classRangeRecord;
+            m = (l + r) >> 1;
+            classRangeRecord = classRangeRecords + 6 * m;
+            strawStart = ttUSHORT(classRangeRecord);
+            strawEnd = ttUSHORT(classRangeRecord + 2);
+            if (needle < strawStart)
+               r = m - 1;
+            else if (needle > strawEnd)
+               l = m + 1;
+            else
+               return (stbtt_int32)ttUSHORT(classRangeRecord + 4);
+         }
+         break;
+      }
+
+      default:
+         return -1; // Unsupported definition type, return an error.
+   }
+
+   // "All glyphs not assigned to a class fall into class 0". (OpenType spec)
+   return 0;
+}
+
+// Define to STBTT_assert(x) if you want to break on unimplemented formats.
+#define STBTT_GPOS_TODO_assert(x)
+
+static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+{
+   stbtt_uint16 lookupListOffset;
+   stbtt_uint8 *lookupList;
+   stbtt_uint16 lookupCount;
+   stbtt_uint8 *data;
+   stbtt_int32 i, sti;
+
+   if (!info->gpos) return 0;
+
+   data = info->data + info->gpos;
+
+   if (ttUSHORT(data+0) != 1) return 0; // Major version 1
+   if (ttUSHORT(data+2) != 0) return 0; // Minor version 0
+
+   lookupListOffset = ttUSHORT(data+8);
+   lookupList = data + lookupListOffset;
+   lookupCount = ttUSHORT(lookupList);
+
+   for (i=0; i<lookupCount; ++i) {
+      stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i);
+      stbtt_uint8 *lookupTable = lookupList + lookupOffset;
+
+      stbtt_uint16 lookupType = ttUSHORT(lookupTable);
+      stbtt_uint16 subTableCount = ttUSHORT(lookupTable + 4);
+      stbtt_uint8 *subTableOffsets = lookupTable + 6;
+      if (lookupType != 2) // Pair Adjustment Positioning Subtable
+         continue;
+
+      for (sti=0; sti<subTableCount; sti++) {
+         stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti);
+         stbtt_uint8 *table = lookupTable + subtableOffset;
+         stbtt_uint16 posFormat = ttUSHORT(table);
+         stbtt_uint16 coverageOffset = ttUSHORT(table + 2);
+         stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(table + coverageOffset, glyph1);
+         if (coverageIndex == -1) continue;
+
+         switch (posFormat) {
+            case 1: {
+               stbtt_int32 l, r, m;
+               int straw, needle;
+               stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+               stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+               if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats?
+                  stbtt_int32 valueRecordPairSizeInBytes = 2;
+                  stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
+                  stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
+                  stbtt_uint8 *pairValueTable = table + pairPosOffset;
+                  stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
+                  stbtt_uint8 *pairValueArray = pairValueTable + 2;
+
+                  if (coverageIndex >= pairSetCount) return 0;
+
+                  needle=glyph2;
+                  r=pairValueCount-1;
+                  l=0;
+
+                  // Binary search.
+                  while (l <= r) {
+                     stbtt_uint16 secondGlyph;
+                     stbtt_uint8 *pairValue;
+                     m = (l + r) >> 1;
+                     pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m;
+                     secondGlyph = ttUSHORT(pairValue);
+                     straw = secondGlyph;
+                     if (needle < straw)
+                        r = m - 1;
+                     else if (needle > straw)
+                        l = m + 1;
+                     else {
+                        stbtt_int16 xAdvance = ttSHORT(pairValue + 2);
+                        return xAdvance;
+                     }
+                  }
+               } else
+                  return 0;
+               break;
+            }
+
+            case 2: {
+               stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+               stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+               if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats?
+                  stbtt_uint16 classDef1Offset = ttUSHORT(table + 8);
+                  stbtt_uint16 classDef2Offset = ttUSHORT(table + 10);
+                  int glyph1class = stbtt__GetGlyphClass(table + classDef1Offset, glyph1);
+                  int glyph2class = stbtt__GetGlyphClass(table + classDef2Offset, glyph2);
+
+                  stbtt_uint16 class1Count = ttUSHORT(table + 12);
+                  stbtt_uint16 class2Count = ttUSHORT(table + 14);
+                  stbtt_uint8 *class1Records, *class2Records;
+                  stbtt_int16 xAdvance;
+
+                  if (glyph1class < 0 || glyph1class >= class1Count) return 0; // malformed
+                  if (glyph2class < 0 || glyph2class >= class2Count) return 0; // malformed
+
+                  class1Records = table + 16;
+                  class2Records = class1Records + 2 * (glyph1class * class2Count);
+                  xAdvance = ttSHORT(class2Records + 2 * glyph2class);
+                  return xAdvance;
+               } else
+                  return 0;
+               break;
+            }
+
+            default:
+               return 0; // Unsupported position format
+         }
+      }
+   }
+
+   return 0;
+}
+
+STBTT_DEF int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int g2)
+{
+   int xAdvance = 0;
+
+   if (info->gpos)
+      xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2);
+   else if (info->kern)
+      xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2);
+
+   return xAdvance;
+}
+
+STBTT_DEF int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
+{
+   if (!info->kern && !info->gpos) // if no kerning table, don't waste time looking up both codepoint->glyphs
+      return 0;
+   return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
+}
+
+STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
+{
+   stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
+}
+
+STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
+{
+   if (ascent ) *ascent  = ttSHORT(info->data+info->hhea + 4);
+   if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
+   if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
+}
+
+STBTT_DEF int  stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap)
+{
+   int tab = stbtt__find_table(info->data, info->fontstart, "OS/2");
+   if (!tab)
+      return 0;
+   if (typoAscent ) *typoAscent  = ttSHORT(info->data+tab + 68);
+   if (typoDescent) *typoDescent = ttSHORT(info->data+tab + 70);
+   if (typoLineGap) *typoLineGap = ttSHORT(info->data+tab + 72);
+   return 1;
+}
+
+STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
+{
+   *x0 = ttSHORT(info->data + info->head + 36);
+   *y0 = ttSHORT(info->data + info->head + 38);
+   *x1 = ttSHORT(info->data + info->head + 40);
+   *y1 = ttSHORT(info->data + info->head + 42);
+}
+
+STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
+{
+   int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
+   return (float) height / fheight;
+}
+
+STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
+{
+   int unitsPerEm = ttUSHORT(info->data + info->head + 18);
+   return pixels / unitsPerEm;
+}
+
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
+{
+   STBTT_free(v, info->userdata);
+}
+
+STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl)
+{
+   int i;
+   stbtt_uint8 *data = info->data;
+   stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info);
+
+   int numEntries = ttUSHORT(svg_doc_list);
+   stbtt_uint8 *svg_docs = svg_doc_list + 2;
+
+   for(i=0; i<numEntries; i++) {
+      stbtt_uint8 *svg_doc = svg_docs + (12 * i);
+      if ((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2)))
+         return svg_doc;
+   }
+   return 0;
+}
+
+STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg)
+{
+   stbtt_uint8 *data = info->data;
+   stbtt_uint8 *svg_doc;
+
+   if (info->svg == 0)
+      return 0;
+
+   svg_doc = stbtt_FindSVGDoc(info, gl);
+   if (svg_doc != NULL) {
+      *svg = (char *) data + info->svg + ttULONG(svg_doc + 4);
+      return ttULONG(svg_doc + 8);
+   } else {
+      return 0;
+   }
+}
+
+STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg)
+{
+   return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info, unicode_codepoint), svg);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// antialiasing software rasterizer
+//
+
+STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning
+   if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
+      // e.g. space character
+      if (ix0) *ix0 = 0;
+      if (iy0) *iy0 = 0;
+      if (ix1) *ix1 = 0;
+      if (iy1) *iy1 = 0;
+   } else {
+      // move to integral bboxes (treating pixels as little squares, what pixels get touched)?
+      if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x);
+      if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y);
+      if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x);
+      if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y);
+   }
+}
+
+STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
+}
+
+STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
+}
+
+STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  Rasterizer
+
+typedef struct stbtt__hheap_chunk
+{
+   struct stbtt__hheap_chunk *next;
+} stbtt__hheap_chunk;
+
+typedef struct stbtt__hheap
+{
+   struct stbtt__hheap_chunk *head;
+   void   *first_free;
+   int    num_remaining_in_head_chunk;
+} stbtt__hheap;
+
+static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata)
+{
+   if (hh->first_free) {
+      void *p = hh->first_free;
+      hh->first_free = * (void **) p;
+      return p;
+   } else {
+      if (hh->num_remaining_in_head_chunk == 0) {
+         int count = (size < 32 ? 2000 : size < 128 ? 800 : 100);
+         stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata);
+         if (c == NULL)
+            return NULL;
+         c->next = hh->head;
+         hh->head = c;
+         hh->num_remaining_in_head_chunk = count;
+      }
+      --hh->num_remaining_in_head_chunk;
+      return (char *) (hh->head) + sizeof(stbtt__hheap_chunk) + size * hh->num_remaining_in_head_chunk;
+   }
+}
+
+static void stbtt__hheap_free(stbtt__hheap *hh, void *p)
+{
+   *(void **) p = hh->first_free;
+   hh->first_free = p;
+}
+
+static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata)
+{
+   stbtt__hheap_chunk *c = hh->head;
+   while (c) {
+      stbtt__hheap_chunk *n = c->next;
+      STBTT_free(c, userdata);
+      c = n;
+   }
+}
+
+typedef struct stbtt__edge {
+   float x0,y0, x1,y1;
+   int invert;
+} stbtt__edge;
+
+
+typedef struct stbtt__active_edge
+{
+   struct stbtt__active_edge *next;
+   #if STBTT_RASTERIZER_VERSION==1
+   int x,dx;
+   float ey;
+   int direction;
+   #elif STBTT_RASTERIZER_VERSION==2
+   float fx,fdx,fdy;
+   float direction;
+   float sy;
+   float ey;
+   #else
+   #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+   #endif
+} stbtt__active_edge;
+
+#if STBTT_RASTERIZER_VERSION == 1
+#define STBTT_FIXSHIFT   10
+#define STBTT_FIX        (1 << STBTT_FIXSHIFT)
+#define STBTT_FIXMASK    (STBTT_FIX-1)
+
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
+{
+   stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
+   float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
+   STBTT_assert(z != NULL);
+   if (!z) return z;
+
+   // round dx down to avoid overshooting
+   if (dxdy < 0)
+      z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy);
+   else
+      z->dx = STBTT_ifloor(STBTT_FIX * dxdy);
+
+   z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); // use z->dx so when we offset later it's by the same amount
+   z->x -= off_x * STBTT_FIX;
+
+   z->ey = e->y1;
+   z->next = 0;
+   z->direction = e->invert ? 1 : -1;
+   return z;
+}
+#elif STBTT_RASTERIZER_VERSION == 2
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
+{
+   stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
+   float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
+   STBTT_assert(z != NULL);
+   //STBTT_assert(e->y0 <= start_point);
+   if (!z) return z;
+   z->fdx = dxdy;
+   z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f;
+   z->fx = e->x0 + dxdy * (start_point - e->y0);
+   z->fx -= off_x;
+   z->direction = e->invert ? 1.0f : -1.0f;
+   z->sy = e->y0;
+   z->ey = e->y1;
+   z->next = 0;
+   return z;
+}
+#else
+#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+
+#if STBTT_RASTERIZER_VERSION == 1
+// note: this routine clips fills that extend off the edges... ideally this
+// wouldn't happen, but it could happen if the truetype glyph bounding boxes
+// are wrong, or if the user supplies a too-small bitmap
+static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
+{
+   // non-zero winding fill
+   int x0=0, w=0;
+
+   while (e) {
+      if (w == 0) {
+         // if we're currently at zero, we need to record the edge start point
+         x0 = e->x; w += e->direction;
+      } else {
+         int x1 = e->x; w += e->direction;
+         // if we went to zero, we need to draw
+         if (w == 0) {
+            int i = x0 >> STBTT_FIXSHIFT;
+            int j = x1 >> STBTT_FIXSHIFT;
+
+            if (i < len && j >= 0) {
+               if (i == j) {
+                  // x0,x1 are the same pixel, so compute combined coverage
+                  scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT);
+               } else {
+                  if (i >= 0) // add antialiasing for x0
+                     scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT);
+                  else
+                     i = -1; // clip
+
+                  if (j < len) // add antialiasing for x1
+                     scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT);
+                  else
+                     j = len; // clip
+
+                  for (++i; i < j; ++i) // fill pixels between x0 and x1
+                     scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
+               }
+            }
+         }
+      }
+
+      e = e->next;
+   }
+}
+
+static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
+{
+   stbtt__hheap hh = { 0, 0, 0 };
+   stbtt__active_edge *active = NULL;
+   int y,j=0;
+   int max_weight = (255 / vsubsample);  // weight per vertical scanline
+   int s; // vertical subsample index
+   unsigned char scanline_data[512], *scanline;
+
+   if (result->w > 512)
+      scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
+   else
+      scanline = scanline_data;
+
+   y = off_y * vsubsample;
+   e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;
+
+   while (j < result->h) {
+      STBTT_memset(scanline, 0, result->w);
+      for (s=0; s < vsubsample; ++s) {
+         // find center of pixel for this scanline
+         float scan_y = y + 0.5f;
+         stbtt__active_edge **step = &active;
+
+         // update all active edges;
+         // remove all active edges that terminate before the center of this scanline
+         while (*step) {
+            stbtt__active_edge * z = *step;
+            if (z->ey <= scan_y) {
+               *step = z->next; // delete from list
+               STBTT_assert(z->direction);
+               z->direction = 0;
+               stbtt__hheap_free(&hh, z);
+            } else {
+               z->x += z->dx; // advance to position for current scanline
+               step = &((*step)->next); // advance through list
+            }
+         }
+
+         // resort the list if needed
+         for(;;) {
+            int changed=0;
+            step = &active;
+            while (*step && (*step)->next) {
+               if ((*step)->x > (*step)->next->x) {
+                  stbtt__active_edge *t = *step;
+                  stbtt__active_edge *q = t->next;
+
+                  t->next = q->next;
+                  q->next = t;
+                  *step = q;
+                  changed = 1;
+               }
+               step = &(*step)->next;
+            }
+            if (!changed) break;
+         }
+
+         // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
+         while (e->y0 <= scan_y) {
+            if (e->y1 > scan_y) {
+               stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata);
+               if (z != NULL) {
+                  // find insertion point
+                  if (active == NULL)
+                     active = z;
+                  else if (z->x < active->x) {
+                     // insert at front
+                     z->next = active;
+                     active = z;
+                  } else {
+                     // find thing to insert AFTER
+                     stbtt__active_edge *p = active;
+                     while (p->next && p->next->x < z->x)
+                        p = p->next;
+                     // at this point, p->next->x is NOT < z->x
+                     z->next = p->next;
+                     p->next = z;
+                  }
+               }
+            }
+            ++e;
+         }
+
+         // now process all active edges in XOR fashion
+         if (active)
+            stbtt__fill_active_edges(scanline, result->w, active, max_weight);
+
+         ++y;
+      }
+      STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
+      ++j;
+   }
+
+   stbtt__hheap_cleanup(&hh, userdata);
+
+   if (scanline != scanline_data)
+      STBTT_free(scanline, userdata);
+}
+
+#elif STBTT_RASTERIZER_VERSION == 2
+
+// the edge passed in here does not cross the vertical line at x or the vertical line at x+1
+// (i.e. it has already been clipped to those)
+static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1)
+{
+   if (y0 == y1) return;
+   STBTT_assert(y0 < y1);
+   STBTT_assert(e->sy <= e->ey);
+   if (y0 > e->ey) return;
+   if (y1 < e->sy) return;
+   if (y0 < e->sy) {
+      x0 += (x1-x0) * (e->sy - y0) / (y1-y0);
+      y0 = e->sy;
+   }
+   if (y1 > e->ey) {
+      x1 += (x1-x0) * (e->ey - y1) / (y1-y0);
+      y1 = e->ey;
+   }
+
+   if (x0 == x)
+      STBTT_assert(x1 <= x+1);
+   else if (x0 == x+1)
+      STBTT_assert(x1 >= x);
+   else if (x0 <= x)
+      STBTT_assert(x1 <= x);
+   else if (x0 >= x+1)
+      STBTT_assert(x1 >= x+1);
+   else
+      STBTT_assert(x1 >= x && x1 <= x+1);
+
+   if (x0 <= x && x1 <= x)
+      scanline[x] += e->direction * (y1-y0);
+   else if (x0 >= x+1 && x1 >= x+1)
+      ;
+   else {
+      STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1);
+      scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position
+   }
+}
+
+static float stbtt__sized_trapezoid_area(float height, float top_width, float bottom_width)
+{
+   STBTT_assert(top_width >= 0);
+   STBTT_assert(bottom_width >= 0);
+   return (top_width + bottom_width) / 2.0f * height;
+}
+
+static float stbtt__position_trapezoid_area(float height, float tx0, float tx1, float bx0, float bx1)
+{
+   return stbtt__sized_trapezoid_area(height, tx1 - tx0, bx1 - bx0);
+}
+
+static float stbtt__sized_triangle_area(float height, float width)
+{
+   return height * width / 2;
+}
+
+static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top)
+{
+   float y_bottom = y_top+1;
+
+   while (e) {
+      // brute force every pixel
+
+      // compute intersection points with top & bottom
+      STBTT_assert(e->ey >= y_top);
+
+      if (e->fdx == 0) {
+         float x0 = e->fx;
+         if (x0 < len) {
+            if (x0 >= 0) {
+               stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom);
+               stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom);
+            } else {
+               stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom);
+            }
+         }
+      } else {
+         float x0 = e->fx;
+         float dx = e->fdx;
+         float xb = x0 + dx;
+         float x_top, x_bottom;
+         float sy0,sy1;
+         float dy = e->fdy;
+         STBTT_assert(e->sy <= y_bottom && e->ey >= y_top);
+
+         // compute endpoints of line segment clipped to this scanline (if the
+         // line segment starts on this scanline. x0 is the intersection of the
+         // line with y_top, but that may be off the line segment.
+         if (e->sy > y_top) {
+            x_top = x0 + dx * (e->sy - y_top);
+            sy0 = e->sy;
+         } else {
+            x_top = x0;
+            sy0 = y_top;
+         }
+         if (e->ey < y_bottom) {
+            x_bottom = x0 + dx * (e->ey - y_top);
+            sy1 = e->ey;
+         } else {
+            x_bottom = xb;
+            sy1 = y_bottom;
+         }
+
+         if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) {
+            // from here on, we don't have to range check x values
+
+            if ((int) x_top == (int) x_bottom) {
+               float height;
+               // simple case, only spans one pixel
+               int x = (int) x_top;
+               height = (sy1 - sy0) * e->direction;
+               STBTT_assert(x >= 0 && x < len);
+               scanline[x]      += stbtt__position_trapezoid_area(height, x_top, x+1.0f, x_bottom, x+1.0f);
+               scanline_fill[x] += height; // everything right of this pixel is filled
+            } else {
+               int x,x1,x2;
+               float y_crossing, y_final, step, sign, area;
+               // covers 2+ pixels
+               if (x_top > x_bottom) {
+                  // flip scanline vertically; signed area is the same
+                  float t;
+                  sy0 = y_bottom - (sy0 - y_top);
+                  sy1 = y_bottom - (sy1 - y_top);
+                  t = sy0, sy0 = sy1, sy1 = t;
+                  t = x_bottom, x_bottom = x_top, x_top = t;
+                  dx = -dx;
+                  dy = -dy;
+                  t = x0, x0 = xb, xb = t;
+               }
+               STBTT_assert(dy >= 0);
+               STBTT_assert(dx >= 0);
+
+               x1 = (int) x_top;
+               x2 = (int) x_bottom;
+               // compute intersection with y axis at x1+1
+               y_crossing = y_top + dy * (x1+1 - x0);
+
+               // compute intersection with y axis at x2
+               y_final = y_top + dy * (x2 - x0);
+
+               //           x1    x_top                            x2    x_bottom
+               //     y_top  +------|-----+------------+------------+--------|---+------------+
+               //            |            |            |            |            |            |
+               //            |            |            |            |            |            |
+               //       sy0  |      Txxxxx|............|............|............|............|
+               // y_crossing |            *xxxxx.......|............|............|............|
+               //            |            |     xxxxx..|............|............|............|
+               //            |            |     /-   xx*xxxx........|............|............|
+               //            |            | dy <       |    xxxxxx..|............|............|
+               //   y_final  |            |     \-     |          xx*xxx.........|............|
+               //       sy1  |            |            |            |   xxxxxB...|............|
+               //            |            |            |            |            |            |
+               //            |            |            |            |            |            |
+               //  y_bottom  +------------+------------+------------+------------+------------+
+               //
+               // goal is to measure the area covered by '.' in each pixel
+
+               // if x2 is right at the right edge of x1, y_crossing can blow up, github #1057
+               // @TODO: maybe test against sy1 rather than y_bottom?
+               if (y_crossing > y_bottom)
+                  y_crossing = y_bottom;
+
+               sign = e->direction;
+
+               // area of the rectangle covered from sy0..y_crossing
+               area = sign * (y_crossing-sy0);
+
+               // area of the triangle (x_top,sy0), (x1+1,sy0), (x1+1,y_crossing)
+               scanline[x1] += stbtt__sized_triangle_area(area, x1+1 - x_top);
+
+               // check if final y_crossing is blown up; no test case for this
+               if (y_final > y_bottom) {
+                  y_final = y_bottom;
+                  dy = (y_final - y_crossing ) / (x2 - (x1+1)); // if denom=0, y_final = y_crossing, so y_final <= y_bottom
+               }
+
+               // in second pixel, area covered by line segment found in first pixel
+               // is always a rectangle 1 wide * the height of that line segment; this
+               // is exactly what the variable 'area' stores. it also gets a contribution
+               // from the line segment within it. the THIRD pixel will get the first
+               // pixel's rectangle contribution, the second pixel's rectangle contribution,
+               // and its own contribution. the 'own contribution' is the same in every pixel except
+               // the leftmost and rightmost, a trapezoid that slides down in each pixel.
+               // the second pixel's contribution to the third pixel will be the
+               // rectangle 1 wide times the height change in the second pixel, which is dy.
+
+               step = sign * dy * 1; // dy is dy/dx, change in y for every 1 change in x,
+               // which multiplied by 1-pixel-width is how much pixel area changes for each step in x
+               // so the area advances by 'step' every time
+
+               for (x = x1+1; x < x2; ++x) {
+                  scanline[x] += area + step/2; // area of trapezoid is 1*step/2
+                  area += step;
+               }
+               STBTT_assert(STBTT_fabs(area) <= 1.01f); // accumulated error from area += step unless we round step down
+               STBTT_assert(sy1 > y_final-0.01f);
+
+               // area covered in the last pixel is the rectangle from all the pixels to the left,
+               // plus the trapezoid filled by the line segment in this pixel all the way to the right edge
+               scanline[x2] += area + sign * stbtt__position_trapezoid_area(sy1-y_final, (float) x2, x2+1.0f, x_bottom, x2+1.0f);
+
+               // the rest of the line is filled based on the total height of the line segment in this pixel
+               scanline_fill[x2] += sign * (sy1-sy0);
+            }
+         } else {
+            // if edge goes outside of box we're drawing, we require
+            // clipping logic. since this does not match the intended use
+            // of this library, we use a different, very slow brute
+            // force implementation
+            // note though that this does happen some of the time because
+            // x_top and x_bottom can be extrapolated at the top & bottom of
+            // the shape and actually lie outside the bounding box
+            int x;
+            for (x=0; x < len; ++x) {
+               // cases:
+               //
+               // there can be up to two intersections with the pixel. any intersection
+               // with left or right edges can be handled by splitting into two (or three)
+               // regions. intersections with top & bottom do not necessitate case-wise logic.
+               //
+               // the old way of doing this found the intersections with the left & right edges,
+               // then used some simple logic to produce up to three segments in sorted order
+               // from top-to-bottom. however, this had a problem: if an x edge was epsilon
+               // across the x border, then the corresponding y position might not be distinct
+               // from the other y segment, and it might ignored as an empty segment. to avoid
+               // that, we need to explicitly produce segments based on x positions.
+
+               // rename variables to clearly-defined pairs
+               float y0 = y_top;
+               float x1 = (float) (x);
+               float x2 = (float) (x+1);
+               float x3 = xb;
+               float y3 = y_bottom;
+
+               // x = e->x + e->dx * (y-y_top)
+               // (y-y_top) = (x - e->x) / e->dx
+               // y = (x - e->x) / e->dx + y_top
+               float y1 = (x - x0) / dx + y_top;
+               float y2 = (x+1 - x0) / dx + y_top;
+
+               if (x0 < x1 && x3 > x2) {         // three segments descending down-right
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+               } else if (x3 < x1 && x0 > x2) {  // three segments descending down-left
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+               } else if (x0 < x1 && x3 > x1) {  // two segments across x, down-right
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+               } else if (x3 < x1 && x0 > x1) {  // two segments across x, down-left
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+               } else if (x0 < x2 && x3 > x2) {  // two segments across x+1, down-right
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+               } else if (x3 < x2 && x0 > x2) {  // two segments across x+1, down-left
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+               } else {  // one segment
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3);
+               }
+            }
+         }
+      }
+      e = e->next;
+   }
+}
+
+// directly AA rasterize edges w/o supersampling
+static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
+{
+   stbtt__hheap hh = { 0, 0, 0 };
+   stbtt__active_edge *active = NULL;
+   int y,j=0, i;
+   float scanline_data[129], *scanline, *scanline2;
+
+   STBTT__NOTUSED(vsubsample);
+
+   if (result->w > 64)
+      scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata);
+   else
+      scanline = scanline_data;
+
+   scanline2 = scanline + result->w;
+
+   y = off_y;
+   e[n].y0 = (float) (off_y + result->h) + 1;
+
+   while (j < result->h) {
+      // find center of pixel for this scanline
+      float scan_y_top    = y + 0.0f;
+      float scan_y_bottom = y + 1.0f;
+      stbtt__active_edge **step = &active;
+
+      STBTT_memset(scanline , 0, result->w*sizeof(scanline[0]));
+      STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0]));
+
+      // update all active edges;
+      // remove all active edges that terminate before the top of this scanline
+      while (*step) {
+         stbtt__active_edge * z = *step;
+         if (z->ey <= scan_y_top) {
+            *step = z->next; // delete from list
+            STBTT_assert(z->direction);
+            z->direction = 0;
+            stbtt__hheap_free(&hh, z);
+         } else {
+            step = &((*step)->next); // advance through list
+         }
+      }
+
+      // insert all edges that start before the bottom of this scanline
+      while (e->y0 <= scan_y_bottom) {
+         if (e->y0 != e->y1) {
+            stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
+            if (z != NULL) {
+               if (j == 0 && off_y != 0) {
+                  if (z->ey < scan_y_top) {
+                     // this can happen due to subpixel positioning and some kind of fp rounding error i think
+                     z->ey = scan_y_top;
+                  }
+               }
+               STBTT_assert(z->ey >= scan_y_top); // if we get really unlucky a tiny bit of an edge can be out of bounds
+               // insert at front
+               z->next = active;
+               active = z;
+            }
+         }
+         ++e;
+      }
+
+      // now process all active edges
+      if (active)
+         stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top);
+
+      {
+         float sum = 0;
+         for (i=0; i < result->w; ++i) {
+            float k;
+            int m;
+            sum += scanline2[i];
+            k = scanline[i] + sum;
+            k = (float) STBTT_fabs(k)*255 + 0.5f;
+            m = (int) k;
+            if (m > 255) m = 255;
+            result->pixels[j*result->stride + i] = (unsigned char) m;
+         }
+      }
+      // advance all the edges
+      step = &active;
+      while (*step) {
+         stbtt__active_edge *z = *step;
+         z->fx += z->fdx; // advance to position for current scanline
+         step = &((*step)->next); // advance through list
+      }
+
+      ++y;
+      ++j;
+   }
+
+   stbtt__hheap_cleanup(&hh, userdata);
+
+   if (scanline != scanline_data)
+      STBTT_free(scanline, userdata);
+}
+#else
+#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+
+#define STBTT__COMPARE(a,b)  ((a)->y0 < (b)->y0)
+
+static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
+{
+   int i,j;
+   for (i=1; i < n; ++i) {
+      stbtt__edge t = p[i], *a = &t;
+      j = i;
+      while (j > 0) {
+         stbtt__edge *b = &p[j-1];
+         int c = STBTT__COMPARE(a,b);
+         if (!c) break;
+         p[j] = p[j-1];
+         --j;
+      }
+      if (i != j)
+         p[j] = t;
+   }
+}
+
+static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
+{
+   /* threshold for transitioning to insertion sort */
+   while (n > 12) {
+      stbtt__edge t;
+      int c01,c12,c,m,i,j;
+
+      /* compute median of three */
+      m = n >> 1;
+      c01 = STBTT__COMPARE(&p[0],&p[m]);
+      c12 = STBTT__COMPARE(&p[m],&p[n-1]);
+      /* if 0 >= mid >= end, or 0 < mid < end, then use mid */
+      if (c01 != c12) {
+         /* otherwise, we'll need to swap something else to middle */
+         int z;
+         c = STBTT__COMPARE(&p[0],&p[n-1]);
+         /* 0>mid && mid<n:  0>n => n; 0<n => 0 */
+         /* 0<mid && mid>n:  0>n => 0; 0<n => n */
+         z = (c == c12) ? 0 : n-1;
+         t = p[z];
+         p[z] = p[m];
+         p[m] = t;
+      }
+      /* now p[m] is the median-of-three */
+      /* swap it to the beginning so it won't move around */
+      t = p[0];
+      p[0] = p[m];
+      p[m] = t;
+
+      /* partition loop */
+      i=1;
+      j=n-1;
+      for(;;) {
+         /* handling of equality is crucial here */
+         /* for sentinels & efficiency with duplicates */
+         for (;;++i) {
+            if (!STBTT__COMPARE(&p[i], &p[0])) break;
+         }
+         for (;;--j) {
+            if (!STBTT__COMPARE(&p[0], &p[j])) break;
+         }
+         /* make sure we haven't crossed */
+         if (i >= j) break;
+         t = p[i];
+         p[i] = p[j];
+         p[j] = t;
+
+         ++i;
+         --j;
+      }
+      /* recurse on smaller side, iterate on larger */
+      if (j < (n-i)) {
+         stbtt__sort_edges_quicksort(p,j);
+         p = p+i;
+         n = n-i;
+      } else {
+         stbtt__sort_edges_quicksort(p+i, n-i);
+         n = j;
+      }
+   }
+}
+
+static void stbtt__sort_edges(stbtt__edge *p, int n)
+{
+   stbtt__sort_edges_quicksort(p, n);
+   stbtt__sort_edges_ins_sort(p, n);
+}
+
+typedef struct
+{
+   float x,y;
+} stbtt__point;
+
+static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
+{
+   float y_scale_inv = invert ? -scale_y : scale_y;
+   stbtt__edge *e;
+   int n,i,j,k,m;
+#if STBTT_RASTERIZER_VERSION == 1
+   int vsubsample = result->h < 8 ? 15 : 5;
+#elif STBTT_RASTERIZER_VERSION == 2
+   int vsubsample = 1;
+#else
+   #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+   // vsubsample should divide 255 evenly; otherwise we won't reach full opacity
+
+   // now we have to blow out the windings into explicit edge lists
+   n = 0;
+   for (i=0; i < windings; ++i)
+      n += wcount[i];
+
+   e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
+   if (e == 0) return;
+   n = 0;
+
+   m=0;
+   for (i=0; i < windings; ++i) {
+      stbtt__point *p = pts + m;
+      m += wcount[i];
+      j = wcount[i]-1;
+      for (k=0; k < wcount[i]; j=k++) {
+         int a=k,b=j;
+         // skip the edge if horizontal
+         if (p[j].y == p[k].y)
+            continue;
+         // add edge from j to k to the list
+         e[n].invert = 0;
+         if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
+            e[n].invert = 1;
+            a=j,b=k;
+         }
+         e[n].x0 = p[a].x * scale_x + shift_x;
+         e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample;
+         e[n].x1 = p[b].x * scale_x + shift_x;
+         e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample;
+         ++n;
+      }
+   }
+
+   // now sort the edges by their highest point (should snap to integer, and then by x)
+   //STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);
+   stbtt__sort_edges(e, n);
+
+   // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
+   stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);
+
+   STBTT_free(e, userdata);
+}
+
+static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
+{
+   if (!points) return; // during first pass, it's unallocated
+   points[n].x = x;
+   points[n].y = y;
+}
+
+// tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching
+static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
+{
+   // midpoint
+   float mx = (x0 + 2*x1 + x2)/4;
+   float my = (y0 + 2*y1 + y2)/4;
+   // versus directly drawn line
+   float dx = (x0+x2)/2 - mx;
+   float dy = (y0+y2)/2 - my;
+   if (n > 16) // 65536 segments on one curve better be enough!
+      return 1;
+   if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
+      stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
+      stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
+   } else {
+      stbtt__add_point(points, *num_points,x2,y2);
+      *num_points = *num_points+1;
+   }
+   return 1;
+}
+
+static void stbtt__tesselate_cubic(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3, float objspace_flatness_squared, int n)
+{
+   // @TODO this "flatness" calculation is just made-up nonsense that seems to work well enough
+   float dx0 = x1-x0;
+   float dy0 = y1-y0;
+   float dx1 = x2-x1;
+   float dy1 = y2-y1;
+   float dx2 = x3-x2;
+   float dy2 = y3-y2;
+   float dx = x3-x0;
+   float dy = y3-y0;
+   float longlen = (float) (STBTT_sqrt(dx0*dx0+dy0*dy0)+STBTT_sqrt(dx1*dx1+dy1*dy1)+STBTT_sqrt(dx2*dx2+dy2*dy2));
+   float shortlen = (float) STBTT_sqrt(dx*dx+dy*dy);
+   float flatness_squared = longlen*longlen-shortlen*shortlen;
+
+   if (n > 16) // 65536 segments on one curve better be enough!
+      return;
+
+   if (flatness_squared > objspace_flatness_squared) {
+      float x01 = (x0+x1)/2;
+      float y01 = (y0+y1)/2;
+      float x12 = (x1+x2)/2;
+      float y12 = (y1+y2)/2;
+      float x23 = (x2+x3)/2;
+      float y23 = (y2+y3)/2;
+
+      float xa = (x01+x12)/2;
+      float ya = (y01+y12)/2;
+      float xb = (x12+x23)/2;
+      float yb = (y12+y23)/2;
+
+      float mx = (xa+xb)/2;
+      float my = (ya+yb)/2;
+
+      stbtt__tesselate_cubic(points, num_points, x0,y0, x01,y01, xa,ya, mx,my, objspace_flatness_squared,n+1);
+      stbtt__tesselate_cubic(points, num_points, mx,my, xb,yb, x23,y23, x3,y3, objspace_flatness_squared,n+1);
+   } else {
+      stbtt__add_point(points, *num_points,x3,y3);
+      *num_points = *num_points+1;
+   }
+}
+
+// returns number of contours
+static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
+{
+   stbtt__point *points=0;
+   int num_points=0;
+
+   float objspace_flatness_squared = objspace_flatness * objspace_flatness;
+   int i,n=0,start=0, pass;
+
+   // count how many "moves" there are to get the contour count
+   for (i=0; i < num_verts; ++i)
+      if (vertices[i].type == STBTT_vmove)
+         ++n;
+
+   *num_contours = n;
+   if (n == 0) return 0;
+
+   *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);
+
+   if (*contour_lengths == 0) {
+      *num_contours = 0;
+      return 0;
+   }
+
+   // make two passes through the points so we don't need to realloc
+   for (pass=0; pass < 2; ++pass) {
+      float x=0,y=0;
+      if (pass == 1) {
+         points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
+         if (points == NULL) goto error;
+      }
+      num_points = 0;
+      n= -1;
+      for (i=0; i < num_verts; ++i) {
+         switch (vertices[i].type) {
+            case STBTT_vmove:
+               // start the next contour
+               if (n >= 0)
+                  (*contour_lengths)[n] = num_points - start;
+               ++n;
+               start = num_points;
+
+               x = vertices[i].x, y = vertices[i].y;
+               stbtt__add_point(points, num_points++, x,y);
+               break;
+            case STBTT_vline:
+               x = vertices[i].x, y = vertices[i].y;
+               stbtt__add_point(points, num_points++, x, y);
+               break;
+            case STBTT_vcurve:
+               stbtt__tesselate_curve(points, &num_points, x,y,
+                                        vertices[i].cx, vertices[i].cy,
+                                        vertices[i].x,  vertices[i].y,
+                                        objspace_flatness_squared, 0);
+               x = vertices[i].x, y = vertices[i].y;
+               break;
+            case STBTT_vcubic:
+               stbtt__tesselate_cubic(points, &num_points, x,y,
+                                        vertices[i].cx, vertices[i].cy,
+                                        vertices[i].cx1, vertices[i].cy1,
+                                        vertices[i].x,  vertices[i].y,
+                                        objspace_flatness_squared, 0);
+               x = vertices[i].x, y = vertices[i].y;
+               break;
+         }
+      }
+      (*contour_lengths)[n] = num_points - start;
+   }
+
+   return points;
+error:
+   STBTT_free(points, userdata);
+   STBTT_free(*contour_lengths, userdata);
+   *contour_lengths = 0;
+   *num_contours = 0;
+   return NULL;
+}
+
+STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
+{
+   float scale            = scale_x > scale_y ? scale_y : scale_x;
+   int winding_count      = 0;
+   int *winding_lengths   = NULL;
+   stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
+   if (windings) {
+      stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
+      STBTT_free(winding_lengths, userdata);
+      STBTT_free(windings, userdata);
+   }
+}
+
+STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
+{
+   STBTT_free(bitmap, userdata);
+}
+
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+   int ix0,iy0,ix1,iy1;
+   stbtt__bitmap gbm;
+   stbtt_vertex *vertices;
+   int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+
+   if (scale_x == 0) scale_x = scale_y;
+   if (scale_y == 0) {
+      if (scale_x == 0) {
+         STBTT_free(vertices, info->userdata);
+         return NULL;
+      }
+      scale_y = scale_x;
+   }
+
+   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);
+
+   // now we get the size
+   gbm.w = (ix1 - ix0);
+   gbm.h = (iy1 - iy0);
+   gbm.pixels = NULL; // in case we error
+
+   if (width ) *width  = gbm.w;
+   if (height) *height = gbm.h;
+   if (xoff  ) *xoff   = ix0;
+   if (yoff  ) *yoff   = iy0;
+
+   if (gbm.w && gbm.h) {
+      gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
+      if (gbm.pixels) {
+         gbm.stride = gbm.w;
+
+         stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
+      }
+   }
+   STBTT_free(vertices, info->userdata);
+   return gbm.pixels;
+}
+
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph)
+{
+   int ix0,iy0;
+   stbtt_vertex *vertices;
+   int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+   stbtt__bitmap gbm;
+
+   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
+   gbm.pixels = output;
+   gbm.w = out_w;
+   gbm.h = out_h;
+   gbm.stride = out_stride;
+
+   if (gbm.w && gbm.h)
+      stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);
+
+   STBTT_free(vertices, info->userdata);
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph)
+{
+   stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
+}
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint)
+{
+   stbtt_MakeGlyphBitmapSubpixelPrefilter(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, oversample_x, oversample_y, sub_x, sub_y, stbtt_FindGlyphIndex(info,codepoint));
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint)
+{
+   stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
+}
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint)
+{
+   stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// bitmap baking
+//
+// This is SUPER-CRAPPY packing to keep source code small
+
+static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
+                                float pixel_height,                     // height of font in pixels
+                                unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
+                                int first_char, int num_chars,          // characters to bake
+                                stbtt_bakedchar *chardata)
+{
+   float scale;
+   int x,y,bottom_y, i;
+   stbtt_fontinfo f;
+   f.userdata = NULL;
+   if (!stbtt_InitFont(&f, data, offset))
+      return -1;
+   STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+   x=y=1;
+   bottom_y = 1;
+
+   scale = stbtt_ScaleForPixelHeight(&f, pixel_height);
+
+   for (i=0; i < num_chars; ++i) {
+      int advance, lsb, x0,y0,x1,y1,gw,gh;
+      int g = stbtt_FindGlyphIndex(&f, first_char + i);
+      stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
+      stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
+      gw = x1-x0;
+      gh = y1-y0;
+      if (x + gw + 1 >= pw)
+         y = bottom_y, x = 1; // advance to next row
+      if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
+         return -i;
+      STBTT_assert(x+gw < pw);
+      STBTT_assert(y+gh < ph);
+      stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
+      chardata[i].x0 = (stbtt_int16) x;
+      chardata[i].y0 = (stbtt_int16) y;
+      chardata[i].x1 = (stbtt_int16) (x + gw);
+      chardata[i].y1 = (stbtt_int16) (y + gh);
+      chardata[i].xadvance = scale * advance;
+      chardata[i].xoff     = (float) x0;
+      chardata[i].yoff     = (float) y0;
+      x = x + gw + 1;
+      if (y+gh+1 > bottom_y)
+         bottom_y = y+gh+1;
+   }
+   return bottom_y;
+}
+
+STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
+{
+   float d3d_bias = opengl_fillrule ? 0 : -0.5f;
+   float ipw = 1.0f / pw, iph = 1.0f / ph;
+   const stbtt_bakedchar *b = chardata + char_index;
+   int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f);
+   int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f);
+
+   q->x0 = round_x + d3d_bias;
+   q->y0 = round_y + d3d_bias;
+   q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
+   q->y1 = round_y + b->y1 - b->y0 + d3d_bias;
+
+   q->s0 = b->x0 * ipw;
+   q->t0 = b->y0 * iph;
+   q->s1 = b->x1 * ipw;
+   q->t1 = b->y1 * iph;
+
+   *xpos += b->xadvance;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// rectangle packing replacement routines if you don't have stb_rect_pack.h
+//
+
+#ifndef STB_RECT_PACK_VERSION
+
+typedef int stbrp_coord;
+
+////////////////////////////////////////////////////////////////////////////////////
+//                                                                                //
+//                                                                                //
+// COMPILER WARNING ?!?!?                                                         //
+//                                                                                //
+//                                                                                //
+// if you get a compile warning due to these symbols being defined more than      //
+// once, move #include "stb_rect_pack.h" before #include "stb_truetype.h"         //
+//                                                                                //
+////////////////////////////////////////////////////////////////////////////////////
+
+typedef struct
+{
+   int width,height;
+   int x,y,bottom_y;
+} stbrp_context;
+
+typedef struct
+{
+   unsigned char x;
+} stbrp_node;
+
+struct stbrp_rect
+{
+   stbrp_coord x,y;
+   int id,w,h,was_packed;
+};
+
+static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes)
+{
+   con->width  = pw;
+   con->height = ph;
+   con->x = 0;
+   con->y = 0;
+   con->bottom_y = 0;
+   STBTT__NOTUSED(nodes);
+   STBTT__NOTUSED(num_nodes);
+}
+
+static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects)
+{
+   int i;
+   for (i=0; i < num_rects; ++i) {
+      if (con->x + rects[i].w > con->width) {
+         con->x = 0;
+         con->y = con->bottom_y;
+      }
+      if (con->y + rects[i].h > con->height)
+         break;
+      rects[i].x = con->x;
+      rects[i].y = con->y;
+      rects[i].was_packed = 1;
+      con->x += rects[i].w;
+      if (con->y + rects[i].h > con->bottom_y)
+         con->bottom_y = con->y + rects[i].h;
+   }
+   for (   ; i < num_rects; ++i)
+      rects[i].was_packed = 0;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// bitmap baking
+//
+// This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If
+// stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy.
+
+STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context)
+{
+   stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context)            ,alloc_context);
+   int            num_nodes = pw - padding;
+   stbrp_node    *nodes   = (stbrp_node    *) STBTT_malloc(sizeof(*nodes  ) * num_nodes,alloc_context);
+
+   if (context == NULL || nodes == NULL) {
+      if (context != NULL) STBTT_free(context, alloc_context);
+      if (nodes   != NULL) STBTT_free(nodes  , alloc_context);
+      return 0;
+   }
+
+   spc->user_allocator_context = alloc_context;
+   spc->width = pw;
+   spc->height = ph;
+   spc->pixels = pixels;
+   spc->pack_info = context;
+   spc->nodes = nodes;
+   spc->padding = padding;
+   spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
+   spc->h_oversample = 1;
+   spc->v_oversample = 1;
+   spc->skip_missing = 0;
+
+   stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
+
+   if (pixels)
+      STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+
+   return 1;
+}
+
+STBTT_DEF void stbtt_PackEnd  (stbtt_pack_context *spc)
+{
+   STBTT_free(spc->nodes    , spc->user_allocator_context);
+   STBTT_free(spc->pack_info, spc->user_allocator_context);
+}
+
+STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample)
+{
+   STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE);
+   STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE);
+   if (h_oversample <= STBTT_MAX_OVERSAMPLE)
+      spc->h_oversample = h_oversample;
+   if (v_oversample <= STBTT_MAX_OVERSAMPLE)
+      spc->v_oversample = v_oversample;
+}
+
+STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip)
+{
+   spc->skip_missing = skip;
+}
+
+#define STBTT__OVER_MASK  (STBTT_MAX_OVERSAMPLE-1)
+
+static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
+{
+   unsigned char buffer[STBTT_MAX_OVERSAMPLE];
+   int safe_w = w - kernel_width;
+   int j;
+   STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
+   for (j=0; j < h; ++j) {
+      int i;
+      unsigned int total;
+      STBTT_memset(buffer, 0, kernel_width);
+
+      total = 0;
+
+      // make kernel_width a constant in common cases so compiler can optimize out the divide
+      switch (kernel_width) {
+         case 2:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 2);
+            }
+            break;
+         case 3:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 3);
+            }
+            break;
+         case 4:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 4);
+            }
+            break;
+         case 5:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 5);
+            }
+            break;
+         default:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / kernel_width);
+            }
+            break;
+      }
+
+      for (; i < w; ++i) {
+         STBTT_assert(pixels[i] == 0);
+         total -= buffer[i & STBTT__OVER_MASK];
+         pixels[i] = (unsigned char) (total / kernel_width);
+      }
+
+      pixels += stride_in_bytes;
+   }
+}
+
+static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
+{
+   unsigned char buffer[STBTT_MAX_OVERSAMPLE];
+   int safe_h = h - kernel_width;
+   int j;
+   STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
+   for (j=0; j < w; ++j) {
+      int i;
+      unsigned int total;
+      STBTT_memset(buffer, 0, kernel_width);
+
+      total = 0;
+
+      // make kernel_width a constant in common cases so compiler can optimize out the divide
+      switch (kernel_width) {
+         case 2:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 2);
+            }
+            break;
+         case 3:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 3);
+            }
+            break;
+         case 4:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 4);
+            }
+            break;
+         case 5:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 5);
+            }
+            break;
+         default:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
+            }
+            break;
+      }
+
+      for (; i < h; ++i) {
+         STBTT_assert(pixels[i*stride_in_bytes] == 0);
+         total -= buffer[i & STBTT__OVER_MASK];
+         pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
+      }
+
+      pixels += 1;
+   }
+}
+
+static float stbtt__oversample_shift(int oversample)
+{
+   if (!oversample)
+      return 0.0f;
+
+   // The prefilter is a box filter of width "oversample",
+   // which shifts phase by (oversample - 1)/2 pixels in
+   // oversampled space. We want to shift in the opposite
+   // direction to counter this.
+   return (float)-(oversample - 1) / (2.0f * (float)oversample);
+}
+
+// rects array must be big enough to accommodate all characters in the given ranges
+STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
+{
+   int i,j,k;
+   int missing_glyph_added = 0;
+
+   k=0;
+   for (i=0; i < num_ranges; ++i) {
+      float fh = ranges[i].font_size;
+      float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
+      ranges[i].h_oversample = (unsigned char) spc->h_oversample;
+      ranges[i].v_oversample = (unsigned char) spc->v_oversample;
+      for (j=0; j < ranges[i].num_chars; ++j) {
+         int x0,y0,x1,y1;
+         int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
+         int glyph = stbtt_FindGlyphIndex(info, codepoint);
+         if (glyph == 0 && (spc->skip_missing || missing_glyph_added)) {
+            rects[k].w = rects[k].h = 0;
+         } else {
+            stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
+                                            scale * spc->h_oversample,
+                                            scale * spc->v_oversample,
+                                            0,0,
+                                            &x0,&y0,&x1,&y1);
+            rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
+            rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
+            if (glyph == 0)
+               missing_glyph_added = 1;
+         }
+         ++k;
+      }
+   }
+
+   return k;
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int prefilter_x, int prefilter_y, float *sub_x, float *sub_y, int glyph)
+{
+   stbtt_MakeGlyphBitmapSubpixel(info,
+                                 output,
+                                 out_w - (prefilter_x - 1),
+                                 out_h - (prefilter_y - 1),
+                                 out_stride,
+                                 scale_x,
+                                 scale_y,
+                                 shift_x,
+                                 shift_y,
+                                 glyph);
+
+   if (prefilter_x > 1)
+      stbtt__h_prefilter(output, out_w, out_h, out_stride, prefilter_x);
+
+   if (prefilter_y > 1)
+      stbtt__v_prefilter(output, out_w, out_h, out_stride, prefilter_y);
+
+   *sub_x = stbtt__oversample_shift(prefilter_x);
+   *sub_y = stbtt__oversample_shift(prefilter_y);
+}
+
+// rects array must be big enough to accommodate all characters in the given ranges
+STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
+{
+   int i,j,k, missing_glyph = -1, return_value = 1;
+
+   // save current values
+   int old_h_over = spc->h_oversample;
+   int old_v_over = spc->v_oversample;
+
+   k = 0;
+   for (i=0; i < num_ranges; ++i) {
+      float fh = ranges[i].font_size;
+      float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
+      float recip_h,recip_v,sub_x,sub_y;
+      spc->h_oversample = ranges[i].h_oversample;
+      spc->v_oversample = ranges[i].v_oversample;
+      recip_h = 1.0f / spc->h_oversample;
+      recip_v = 1.0f / spc->v_oversample;
+      sub_x = stbtt__oversample_shift(spc->h_oversample);
+      sub_y = stbtt__oversample_shift(spc->v_oversample);
+      for (j=0; j < ranges[i].num_chars; ++j) {
+         stbrp_rect *r = &rects[k];
+         if (r->was_packed && r->w != 0 && r->h != 0) {
+            stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
+            int advance, lsb, x0,y0,x1,y1;
+            int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
+            int glyph = stbtt_FindGlyphIndex(info, codepoint);
+            stbrp_coord pad = (stbrp_coord) spc->padding;
+
+            // pad on left and top
+            r->x += pad;
+            r->y += pad;
+            r->w -= pad;
+            r->h -= pad;
+            stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb);
+            stbtt_GetGlyphBitmapBox(info, glyph,
+                                    scale * spc->h_oversample,
+                                    scale * spc->v_oversample,
+                                    &x0,&y0,&x1,&y1);
+            stbtt_MakeGlyphBitmapSubpixel(info,
+                                          spc->pixels + r->x + r->y*spc->stride_in_bytes,
+                                          r->w - spc->h_oversample+1,
+                                          r->h - spc->v_oversample+1,
+                                          spc->stride_in_bytes,
+                                          scale * spc->h_oversample,
+                                          scale * spc->v_oversample,
+                                          0,0,
+                                          glyph);
+
+            if (spc->h_oversample > 1)
+               stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
+                                  r->w, r->h, spc->stride_in_bytes,
+                                  spc->h_oversample);
+
+            if (spc->v_oversample > 1)
+               stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
+                                  r->w, r->h, spc->stride_in_bytes,
+                                  spc->v_oversample);
+
+            bc->x0       = (stbtt_int16)  r->x;
+            bc->y0       = (stbtt_int16)  r->y;
+            bc->x1       = (stbtt_int16) (r->x + r->w);
+            bc->y1       = (stbtt_int16) (r->y + r->h);
+            bc->xadvance =                scale * advance;
+            bc->xoff     =       (float)  x0 * recip_h + sub_x;
+            bc->yoff     =       (float)  y0 * recip_v + sub_y;
+            bc->xoff2    =                (x0 + r->w) * recip_h + sub_x;
+            bc->yoff2    =                (y0 + r->h) * recip_v + sub_y;
+
+            if (glyph == 0)
+               missing_glyph = j;
+         } else if (spc->skip_missing) {
+            return_value = 0;
+         } else if (r->was_packed && r->w == 0 && r->h == 0 && missing_glyph >= 0) {
+            ranges[i].chardata_for_range[j] = ranges[i].chardata_for_range[missing_glyph];
+         } else {
+            return_value = 0; // if any fail, report failure
+         }
+
+         ++k;
+      }
+   }
+
+   // restore original values
+   spc->h_oversample = old_h_over;
+   spc->v_oversample = old_v_over;
+
+   return return_value;
+}
+
+STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects)
+{
+   stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects);
+}
+
+STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
+{
+   stbtt_fontinfo info;
+   int i,j,n, return_value = 1;
+   //stbrp_context *context = (stbrp_context *) spc->pack_info;
+   stbrp_rect    *rects;
+
+   // flag all characters as NOT packed
+   for (i=0; i < num_ranges; ++i)
+      for (j=0; j < ranges[i].num_chars; ++j)
+         ranges[i].chardata_for_range[j].x0 =
+         ranges[i].chardata_for_range[j].y0 =
+         ranges[i].chardata_for_range[j].x1 =
+         ranges[i].chardata_for_range[j].y1 = 0;
+
+   n = 0;
+   for (i=0; i < num_ranges; ++i)
+      n += ranges[i].num_chars;
+
+   rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context);
+   if (rects == NULL)
+      return 0;
+
+   info.userdata = spc->user_allocator_context;
+   stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
+
+   n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects);
+
+   stbtt_PackFontRangesPackRects(spc, rects, n);
+
+   return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects);
+
+   STBTT_free(rects, spc->user_allocator_context);
+   return return_value;
+}
+
+STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size,
+            int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range)
+{
+   stbtt_pack_range range;
+   range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range;
+   range.array_of_unicode_codepoints = NULL;
+   range.num_chars                   = num_chars_in_range;
+   range.chardata_for_range          = chardata_for_range;
+   range.font_size                   = font_size;
+   return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
+}
+
+STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap)
+{
+   int i_ascent, i_descent, i_lineGap;
+   float scale;
+   stbtt_fontinfo info;
+   stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata, index));
+   scale = size > 0 ? stbtt_ScaleForPixelHeight(&info, size) : stbtt_ScaleForMappingEmToPixels(&info, -size);
+   stbtt_GetFontVMetrics(&info, &i_ascent, &i_descent, &i_lineGap);
+   *ascent  = (float) i_ascent  * scale;
+   *descent = (float) i_descent * scale;
+   *lineGap = (float) i_lineGap * scale;
+}
+
+STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
+{
+   float ipw = 1.0f / pw, iph = 1.0f / ph;
+   const stbtt_packedchar *b = chardata + char_index;
+
+   if (align_to_integer) {
+      float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f);
+      float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f);
+      q->x0 = x;
+      q->y0 = y;
+      q->x1 = x + b->xoff2 - b->xoff;
+      q->y1 = y + b->yoff2 - b->yoff;
+   } else {
+      q->x0 = *xpos + b->xoff;
+      q->y0 = *ypos + b->yoff;
+      q->x1 = *xpos + b->xoff2;
+      q->y1 = *ypos + b->yoff2;
+   }
+
+   q->s0 = b->x0 * ipw;
+   q->t0 = b->y0 * iph;
+   q->s1 = b->x1 * ipw;
+   q->t1 = b->y1 * iph;
+
+   *xpos += b->xadvance;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// sdf computation
+//
+
+#define STBTT_min(a,b)  ((a) < (b) ? (a) : (b))
+#define STBTT_max(a,b)  ((a) < (b) ? (b) : (a))
+
+static int stbtt__ray_intersect_bezier(float orig[2], float ray[2], float q0[2], float q1[2], float q2[2], float hits[2][2])
+{
+   float q0perp = q0[1]*ray[0] - q0[0]*ray[1];
+   float q1perp = q1[1]*ray[0] - q1[0]*ray[1];
+   float q2perp = q2[1]*ray[0] - q2[0]*ray[1];
+   float roperp = orig[1]*ray[0] - orig[0]*ray[1];
+
+   float a = q0perp - 2*q1perp + q2perp;
+   float b = q1perp - q0perp;
+   float c = q0perp - roperp;
+
+   float s0 = 0., s1 = 0.;
+   int num_s = 0;
+
+   if (a != 0.0) {
+      float discr = b*b - a*c;
+      if (discr > 0.0) {
+         float rcpna = -1 / a;
+         float d = (float) STBTT_sqrt(discr);
+         s0 = (b+d) * rcpna;
+         s1 = (b-d) * rcpna;
+         if (s0 >= 0.0 && s0 <= 1.0)
+            num_s = 1;
+         if (d > 0.0 && s1 >= 0.0 && s1 <= 1.0) {
+            if (num_s == 0) s0 = s1;
+            ++num_s;
+         }
+      }
+   } else {
+      // 2*b*s + c = 0
+      // s = -c / (2*b)
+      s0 = c / (-2 * b);
+      if (s0 >= 0.0 && s0 <= 1.0)
+         num_s = 1;
+   }
+
+   if (num_s == 0)
+      return 0;
+   else {
+      float rcp_len2 = 1 / (ray[0]*ray[0] + ray[1]*ray[1]);
+      float rayn_x = ray[0] * rcp_len2, rayn_y = ray[1] * rcp_len2;
+
+      float q0d =   q0[0]*rayn_x +   q0[1]*rayn_y;
+      float q1d =   q1[0]*rayn_x +   q1[1]*rayn_y;
+      float q2d =   q2[0]*rayn_x +   q2[1]*rayn_y;
+      float rod = orig[0]*rayn_x + orig[1]*rayn_y;
+
+      float q10d = q1d - q0d;
+      float q20d = q2d - q0d;
+      float q0rd = q0d - rod;
+
+      hits[0][0] = q0rd + s0*(2.0f - 2.0f*s0)*q10d + s0*s0*q20d;
+      hits[0][1] = a*s0+b;
+
+      if (num_s > 1) {
+         hits[1][0] = q0rd + s1*(2.0f - 2.0f*s1)*q10d + s1*s1*q20d;
+         hits[1][1] = a*s1+b;
+         return 2;
+      } else {
+         return 1;
+      }
+   }
+}
+
+static int equal(float *a, float *b)
+{
+   return (a[0] == b[0] && a[1] == b[1]);
+}
+
+static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex *verts)
+{
+   int i;
+   float orig[2], ray[2] = { 1, 0 };
+   float y_frac;
+   int winding = 0;
+
+   // make sure y never passes through a vertex of the shape
+   y_frac = (float) STBTT_fmod(y, 1.0f);
+   if (y_frac < 0.01f)
+      y += 0.01f;
+   else if (y_frac > 0.99f)
+      y -= 0.01f;
+
+   orig[0] = x;
+   orig[1] = y;
+
+   // test a ray from (-infinity,y) to (x,y)
+   for (i=0; i < nverts; ++i) {
+      if (verts[i].type == STBTT_vline) {
+         int x0 = (int) verts[i-1].x, y0 = (int) verts[i-1].y;
+         int x1 = (int) verts[i  ].x, y1 = (int) verts[i  ].y;
+         if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) {
+            float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0;
+            if (x_inter < x)
+               winding += (y0 < y1) ? 1 : -1;
+         }
+      }
+      if (verts[i].type == STBTT_vcurve) {
+         int x0 = (int) verts[i-1].x , y0 = (int) verts[i-1].y ;
+         int x1 = (int) verts[i  ].cx, y1 = (int) verts[i  ].cy;
+         int x2 = (int) verts[i  ].x , y2 = (int) verts[i  ].y ;
+         int ax = STBTT_min(x0,STBTT_min(x1,x2)), ay = STBTT_min(y0,STBTT_min(y1,y2));
+         int by = STBTT_max(y0,STBTT_max(y1,y2));
+         if (y > ay && y < by && x > ax) {
+            float q0[2],q1[2],q2[2];
+            float hits[2][2];
+            q0[0] = (float)x0;
+            q0[1] = (float)y0;
+            q1[0] = (float)x1;
+            q1[1] = (float)y1;
+            q2[0] = (float)x2;
+            q2[1] = (float)y2;
+            if (equal(q0,q1) || equal(q1,q2)) {
+               x0 = (int)verts[i-1].x;
+               y0 = (int)verts[i-1].y;
+               x1 = (int)verts[i  ].x;
+               y1 = (int)verts[i  ].y;
+               if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) {
+                  float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0;
+                  if (x_inter < x)
+                     winding += (y0 < y1) ? 1 : -1;
+               }
+            } else {
+               int num_hits = stbtt__ray_intersect_bezier(orig, ray, q0, q1, q2, hits);
+               if (num_hits >= 1)
+                  if (hits[0][0] < 0)
+                     winding += (hits[0][1] < 0 ? -1 : 1);
+               if (num_hits >= 2)
+                  if (hits[1][0] < 0)
+                     winding += (hits[1][1] < 0 ? -1 : 1);
+            }
+         }
+      }
+   }
+   return winding;
+}
+
+static float stbtt__cuberoot( float x )
+{
+   if (x<0)
+      return -(float) STBTT_pow(-x,1.0f/3.0f);
+   else
+      return  (float) STBTT_pow( x,1.0f/3.0f);
+}
+
+// x^3 + a*x^2 + b*x + c = 0
+static int stbtt__solve_cubic(float a, float b, float c, float* r)
+{
+   float s = -a / 3;
+   float p = b - a*a / 3;
+   float q = a * (2*a*a - 9*b) / 27 + c;
+   float p3 = p*p*p;
+   float d = q*q + 4*p3 / 27;
+   if (d >= 0) {
+      float z = (float) STBTT_sqrt(d);
+      float u = (-q + z) / 2;
+      float v = (-q - z) / 2;
+      u = stbtt__cuberoot(u);
+      v = stbtt__cuberoot(v);
+      r[0] = s + u + v;
+      return 1;
+   } else {
+      float u = (float) STBTT_sqrt(-p/3);
+      float v = (float) STBTT_acos(-STBTT_sqrt(-27/p3) * q / 2) / 3; // p3 must be negative, since d is negative
+      float m = (float) STBTT_cos(v);
+      float n = (float) STBTT_cos(v-3.141592/2)*1.732050808f;
+      r[0] = s + u * 2 * m;
+      r[1] = s - u * (m + n);
+      r[2] = s - u * (m - n);
+
+      //STBTT_assert( STBTT_fabs(((r[0]+a)*r[0]+b)*r[0]+c) < 0.05f);  // these asserts may not be safe at all scales, though they're in bezier t parameter units so maybe?
+      //STBTT_assert( STBTT_fabs(((r[1]+a)*r[1]+b)*r[1]+c) < 0.05f);
+      //STBTT_assert( STBTT_fabs(((r[2]+a)*r[2]+b)*r[2]+c) < 0.05f);
+      return 3;
+   }
+}
+
+STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff)
+{
+   float scale_x = scale, scale_y = scale;
+   int ix0,iy0,ix1,iy1;
+   int w,h;
+   unsigned char *data;
+
+   if (scale == 0) return NULL;
+
+   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale, scale, 0.0f,0.0f, &ix0,&iy0,&ix1,&iy1);
+
+   // if empty, return NULL
+   if (ix0 == ix1 || iy0 == iy1)
+      return NULL;
+
+   ix0 -= padding;
+   iy0 -= padding;
+   ix1 += padding;
+   iy1 += padding;
+
+   w = (ix1 - ix0);
+   h = (iy1 - iy0);
+
+   if (width ) *width  = w;
+   if (height) *height = h;
+   if (xoff  ) *xoff   = ix0;
+   if (yoff  ) *yoff   = iy0;
+
+   // invert for y-downwards bitmaps
+   scale_y = -scale_y;
+
+   {
+      // distance from singular values (in the same units as the pixel grid)
+      const float eps = 1./1024, eps2 = eps*eps;
+      int x,y,i,j;
+      float *precompute;
+      stbtt_vertex *verts;
+      int num_verts = stbtt_GetGlyphShape(info, glyph, &verts);
+      data = (unsigned char *) STBTT_malloc(w * h, info->userdata);
+      precompute = (float *) STBTT_malloc(num_verts * sizeof(float), info->userdata);
+
+      for (i=0,j=num_verts-1; i < num_verts; j=i++) {
+         if (verts[i].type == STBTT_vline) {
+            float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y;
+            float x1 = verts[j].x*scale_x, y1 = verts[j].y*scale_y;
+            float dist = (float) STBTT_sqrt((x1-x0)*(x1-x0) + (y1-y0)*(y1-y0));
+            precompute[i] = (dist < eps) ? 0.0f : 1.0f / dist;
+         } else if (verts[i].type == STBTT_vcurve) {
+            float x2 = verts[j].x *scale_x, y2 = verts[j].y *scale_y;
+            float x1 = verts[i].cx*scale_x, y1 = verts[i].cy*scale_y;
+            float x0 = verts[i].x *scale_x, y0 = verts[i].y *scale_y;
+            float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2;
+            float len2 = bx*bx + by*by;
+            if (len2 >= eps2)
+               precompute[i] = 1.0f / len2;
+            else
+               precompute[i] = 0.0f;
+         } else
+            precompute[i] = 0.0f;
+      }
+
+      for (y=iy0; y < iy1; ++y) {
+         for (x=ix0; x < ix1; ++x) {
+            float val;
+            float min_dist = 999999.0f;
+            float sx = (float) x + 0.5f;
+            float sy = (float) y + 0.5f;
+            float x_gspace = (sx / scale_x);
+            float y_gspace = (sy / scale_y);
+
+            int winding = stbtt__compute_crossings_x(x_gspace, y_gspace, num_verts, verts); // @OPTIMIZE: this could just be a rasterization, but needs to be line vs. non-tesselated curves so a new path
+
+            for (i=0; i < num_verts; ++i) {
+               float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y;
+
+               if (verts[i].type == STBTT_vline && precompute[i] != 0.0f) {
+                  float x1 = verts[i-1].x*scale_x, y1 = verts[i-1].y*scale_y;
+
+                  float dist,dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy);
+                  if (dist2 < min_dist*min_dist)
+                     min_dist = (float) STBTT_sqrt(dist2);
+
+                  // coarse culling against bbox
+                  //if (sx > STBTT_min(x0,x1)-min_dist && sx < STBTT_max(x0,x1)+min_dist &&
+                  //    sy > STBTT_min(y0,y1)-min_dist && sy < STBTT_max(y0,y1)+min_dist)
+                  dist = (float) STBTT_fabs((x1-x0)*(y0-sy) - (y1-y0)*(x0-sx)) * precompute[i];
+                  STBTT_assert(i != 0);
+                  if (dist < min_dist) {
+                     // check position along line
+                     // x' = x0 + t*(x1-x0), y' = y0 + t*(y1-y0)
+                     // minimize (x'-sx)*(x'-sx)+(y'-sy)*(y'-sy)
+                     float dx = x1-x0, dy = y1-y0;
+                     float px = x0-sx, py = y0-sy;
+                     // minimize (px+t*dx)^2 + (py+t*dy)^2 = px*px + 2*px*dx*t + t^2*dx*dx + py*py + 2*py*dy*t + t^2*dy*dy
+                     // derivative: 2*px*dx + 2*py*dy + (2*dx*dx+2*dy*dy)*t, set to 0 and solve
+                     float t = -(px*dx + py*dy) / (dx*dx + dy*dy);
+                     if (t >= 0.0f && t <= 1.0f)
+                        min_dist = dist;
+                  }
+               } else if (verts[i].type == STBTT_vcurve) {
+                  float x2 = verts[i-1].x *scale_x, y2 = verts[i-1].y *scale_y;
+                  float x1 = verts[i  ].cx*scale_x, y1 = verts[i  ].cy*scale_y;
+                  float box_x0 = STBTT_min(STBTT_min(x0,x1),x2);
+                  float box_y0 = STBTT_min(STBTT_min(y0,y1),y2);
+                  float box_x1 = STBTT_max(STBTT_max(x0,x1),x2);
+                  float box_y1 = STBTT_max(STBTT_max(y0,y1),y2);
+                  // coarse culling against bbox to avoid computing cubic unnecessarily
+                  if (sx > box_x0-min_dist && sx < box_x1+min_dist && sy > box_y0-min_dist && sy < box_y1+min_dist) {
+                     int num=0;
+                     float ax = x1-x0, ay = y1-y0;
+                     float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2;
+                     float mx = x0 - sx, my = y0 - sy;
+                     float res[3] = {0.f,0.f,0.f};
+                     float px,py,t,it,dist2;
+                     float a_inv = precompute[i];
+                     if (a_inv == 0.0) { // if a_inv is 0, it's 2nd degree so use quadratic formula
+                        float a = 3*(ax*bx + ay*by);
+                        float b = 2*(ax*ax + ay*ay) + (mx*bx+my*by);
+                        float c = mx*ax+my*ay;
+                        if (STBTT_fabs(a) < eps2) { // if a is 0, it's linear
+                           if (STBTT_fabs(b) >= eps2) {
+                              res[num++] = -c/b;
+                           }
+                        } else {
+                           float discriminant = b*b - 4*a*c;
+                           if (discriminant < 0)
+                              num = 0;
+                           else {
+                              float root = (float) STBTT_sqrt(discriminant);
+                              res[0] = (-b - root)/(2*a);
+                              res[1] = (-b + root)/(2*a);
+                              num = 2; // don't bother distinguishing 1-solution case, as code below will still work
+                           }
+                        }
+                     } else {
+                        float b = 3*(ax*bx + ay*by) * a_inv; // could precompute this as it doesn't depend on sample point
+                        float c = (2*(ax*ax + ay*ay) + (mx*bx+my*by)) * a_inv;
+                        float d = (mx*ax+my*ay) * a_inv;
+                        num = stbtt__solve_cubic(b, c, d, res);
+                     }
+                     dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy);
+                     if (dist2 < min_dist*min_dist)
+                        min_dist = (float) STBTT_sqrt(dist2);
+
+                     if (num >= 1 && res[0] >= 0.0f && res[0] <= 1.0f) {
+                        t = res[0], it = 1.0f - t;
+                        px = it*it*x0 + 2*t*it*x1 + t*t*x2;
+                        py = it*it*y0 + 2*t*it*y1 + t*t*y2;
+                        dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy);
+                        if (dist2 < min_dist * min_dist)
+                           min_dist = (float) STBTT_sqrt(dist2);
+                     }
+                     if (num >= 2 && res[1] >= 0.0f && res[1] <= 1.0f) {
+                        t = res[1], it = 1.0f - t;
+                        px = it*it*x0 + 2*t*it*x1 + t*t*x2;
+                        py = it*it*y0 + 2*t*it*y1 + t*t*y2;
+                        dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy);
+                        if (dist2 < min_dist * min_dist)
+                           min_dist = (float) STBTT_sqrt(dist2);
+                     }
+                     if (num >= 3 && res[2] >= 0.0f && res[2] <= 1.0f) {
+                        t = res[2], it = 1.0f - t;
+                        px = it*it*x0 + 2*t*it*x1 + t*t*x2;
+                        py = it*it*y0 + 2*t*it*y1 + t*t*y2;
+                        dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy);
+                        if (dist2 < min_dist * min_dist)
+                           min_dist = (float) STBTT_sqrt(dist2);
+                     }
+                  }
+               }
+            }
+            if (winding == 0)
+               min_dist = -min_dist;  // if outside the shape, value is negative
+            val = onedge_value + pixel_dist_scale * min_dist;
+            if (val < 0)
+               val = 0;
+            else if (val > 255)
+               val = 255;
+            data[(y-iy0)*w+(x-ix0)] = (unsigned char) val;
+         }
+      }
+      STBTT_free(precompute, info->userdata);
+      STBTT_free(verts, info->userdata);
+   }
+   return data;
+}
+
+STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetGlyphSDF(info, scale, stbtt_FindGlyphIndex(info, codepoint), padding, onedge_value, pixel_dist_scale, width, height, xoff, yoff);
+}
+
+STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata)
+{
+   STBTT_free(bitmap, userdata);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// font name matching -- recommended not to use this
+//
+
+// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
+static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(stbtt_uint8 *s1, stbtt_int32 len1, stbtt_uint8 *s2, stbtt_int32 len2)
+{
+   stbtt_int32 i=0;
+
+   // convert utf16 to utf8 and compare the results while converting
+   while (len2) {
+      stbtt_uint16 ch = s2[0]*256 + s2[1];
+      if (ch < 0x80) {
+         if (i >= len1) return -1;
+         if (s1[i++] != ch) return -1;
+      } else if (ch < 0x800) {
+         if (i+1 >= len1) return -1;
+         if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
+         if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
+      } else if (ch >= 0xd800 && ch < 0xdc00) {
+         stbtt_uint32 c;
+         stbtt_uint16 ch2 = s2[2]*256 + s2[3];
+         if (i+3 >= len1) return -1;
+         c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
+         if (s1[i++] != 0xf0 + (c >> 18)) return -1;
+         if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
+         if (s1[i++] != 0x80 + ((c >>  6) & 0x3f)) return -1;
+         if (s1[i++] != 0x80 + ((c      ) & 0x3f)) return -1;
+         s2 += 2; // plus another 2 below
+         len2 -= 2;
+      } else if (ch >= 0xdc00 && ch < 0xe000) {
+         return -1;
+      } else {
+         if (i+2 >= len1) return -1;
+         if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
+         if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
+         if (s1[i++] != 0x80 + ((ch     ) & 0x3f)) return -1;
+      }
+      s2 += 2;
+      len2 -= 2;
+   }
+   return i;
+}
+
+static int stbtt_CompareUTF8toUTF16_bigendian_internal(char *s1, int len1, char *s2, int len2)
+{
+   return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((stbtt_uint8*) s1, len1, (stbtt_uint8*) s2, len2);
+}
+
+// returns results in whatever encoding you request... but note that 2-byte encodings
+// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
+STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
+{
+   stbtt_int32 i,count,stringOffset;
+   stbtt_uint8 *fc = font->data;
+   stbtt_uint32 offset = font->fontstart;
+   stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
+   if (!nm) return NULL;
+
+   count = ttUSHORT(fc+nm+2);
+   stringOffset = nm + ttUSHORT(fc+nm+4);
+   for (i=0; i < count; ++i) {
+      stbtt_uint32 loc = nm + 6 + 12 * i;
+      if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
+          && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
+         *length = ttUSHORT(fc+loc+8);
+         return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
+      }
+   }
+   return NULL;
+}
+
+static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
+{
+   stbtt_int32 i;
+   stbtt_int32 count = ttUSHORT(fc+nm+2);
+   stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);
+
+   for (i=0; i < count; ++i) {
+      stbtt_uint32 loc = nm + 6 + 12 * i;
+      stbtt_int32 id = ttUSHORT(fc+loc+6);
+      if (id == target_id) {
+         // find the encoding
+         stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);
+
+         // is this a Unicode encoding?
+         if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
+            stbtt_int32 slen = ttUSHORT(fc+loc+8);
+            stbtt_int32 off = ttUSHORT(fc+loc+10);
+
+            // check if there's a prefix match
+            stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
+            if (matchlen >= 0) {
+               // check for target_id+1 immediately following, with same encoding & language
+               if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
+                  slen = ttUSHORT(fc+loc+12+8);
+                  off = ttUSHORT(fc+loc+12+10);
+                  if (slen == 0) {
+                     if (matchlen == nlen)
+                        return 1;
+                  } else if (matchlen < nlen && name[matchlen] == ' ') {
+                     ++matchlen;
+                     if (stbtt_CompareUTF8toUTF16_bigendian_internal((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
+                        return 1;
+                  }
+               } else {
+                  // if nothing immediately following
+                  if (matchlen == nlen)
+                     return 1;
+               }
+            }
+         }
+
+         // @TODO handle other encodings
+      }
+   }
+   return 0;
+}
+
+static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
+{
+   stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
+   stbtt_uint32 nm,hd;
+   if (!stbtt__isfont(fc+offset)) return 0;
+
+   // check italics/bold/underline flags in macStyle...
+   if (flags) {
+      hd = stbtt__find_table(fc, offset, "head");
+      if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
+   }
+
+   nm = stbtt__find_table(fc, offset, "name");
+   if (!nm) return 0;
+
+   if (flags) {
+      // if we checked the macStyle flags, then just check the family and ignore the subfamily
+      if (stbtt__matchpair(fc, nm, name, nlen, 16, -1))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  1, -1))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
+   } else {
+      if (stbtt__matchpair(fc, nm, name, nlen, 16, 17))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  1,  2))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
+   }
+
+   return 0;
+}
+
+static int stbtt_FindMatchingFont_internal(unsigned char *font_collection, char *name_utf8, stbtt_int32 flags)
+{
+   stbtt_int32 i;
+   for (i=0;;++i) {
+      stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
+      if (off < 0) return off;
+      if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
+         return off;
+   }
+}
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+
+STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset,
+                                float pixel_height, unsigned char *pixels, int pw, int ph,
+                                int first_char, int num_chars, stbtt_bakedchar *chardata)
+{
+   return stbtt_BakeFontBitmap_internal((unsigned char *) data, offset, pixel_height, pixels, pw, ph, first_char, num_chars, chardata);
+}
+
+STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index)
+{
+   return stbtt_GetFontOffsetForIndex_internal((unsigned char *) data, index);
+}
+
+STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data)
+{
+   return stbtt_GetNumberOfFonts_internal((unsigned char *) data);
+}
+
+STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset)
+{
+   return stbtt_InitFont_internal(info, (unsigned char *) data, offset);
+}
+
+STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags)
+{
+   return stbtt_FindMatchingFont_internal((unsigned char *) fontdata, (char *) name, flags);
+}
+
+STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
+{
+   return stbtt_CompareUTF8toUTF16_bigendian_internal((char *) s1, len1, (char *) s2, len2);
+}
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
+
+#endif // STB_TRUETYPE_IMPLEMENTATION
+
+
+// FULL VERSION HISTORY
+//
+//   1.25 (2021-07-11) many fixes
+//   1.24 (2020-02-05) fix warning
+//   1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS)
+//   1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined
+//   1.21 (2019-02-25) fix warning
+//   1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics()
+//   1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod
+//   1.18 (2018-01-29) add missing function
+//   1.17 (2017-07-23) make more arguments const; doc fix
+//   1.16 (2017-07-12) SDF support
+//   1.15 (2017-03-03) make more arguments const
+//   1.14 (2017-01-16) num-fonts-in-TTC function
+//   1.13 (2017-01-02) support OpenType fonts, certain Apple fonts
+//   1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual
+//   1.11 (2016-04-02) fix unused-variable warning
+//   1.10 (2016-04-02) allow user-defined fabs() replacement
+//                     fix memory leak if fontsize=0.0
+//                     fix warning from duplicate typedef
+//   1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges
+//   1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
+//   1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
+//                     allow PackFontRanges to pack and render in separate phases;
+//                     fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
+//                     fixed an assert() bug in the new rasterizer
+//                     replace assert() with STBTT_assert() in new rasterizer
+//   1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine)
+//                     also more precise AA rasterizer, except if shapes overlap
+//                     remove need for STBTT_sort
+//   1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC
+//   1.04 (2015-04-15) typo in example
+//   1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes
+//   1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack, C++
+//   1.01 (2014-12-08) fix subpixel position when oversampling to exactly match
+//                        non-oversampled; STBTT_POINT_SIZE for packed case only
+//   1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling
+//   0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg)
+//   0.9  (2014-08-07) support certain mac/iOS fonts without an MS platformID
+//   0.8b (2014-07-07) fix a warning
+//   0.8  (2014-05-25) fix a few more warnings
+//   0.7  (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
+//   0.6c (2012-07-24) improve documentation
+//   0.6b (2012-07-20) fix a few more warnings
+//   0.6  (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
+//                        stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
+//   0.5  (2011-12-09) bugfixes:
+//                        subpixel glyph renderer computed wrong bounding box
+//                        first vertex of shape can be off-curve (FreeSans)
+//   0.4b (2011-12-03) fixed an error in the font baking example
+//   0.4  (2011-12-01) kerning, subpixel rendering (tor)
+//                    bugfixes for:
+//                        codepoint-to-glyph conversion using table fmt=12
+//                        codepoint-to-glyph conversion using table fmt=4
+//                        stbtt_GetBakedQuad with non-square texture (Zer)
+//                    updated Hello World! sample to use kerning and subpixel
+//                    fixed some warnings
+//   0.3  (2009-06-24) cmap fmt=12, compound shapes (MM)
+//                    userdata, malloc-from-userdata, non-zero fill (stb)
+//   0.2  (2009-03-11) Fix unsigned/signed char warnings
+//   0.1  (2009-03-09) First public release
+//
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/
diff --git a/programs/include/gui/terminal.hpp b/programs/include/gui/terminal.hpp
index 8f28453..e40179c 100644
--- a/programs/include/gui/terminal.hpp
+++ b/programs/include/gui/terminal.hpp
@@ -423,6 +423,11 @@ static inline void terminal_feed(TerminalState* t, const char* data, int len) {
 }
 
 static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, int ph) {
+    int cell_w = mono_cell_width();
+    int cell_h = mono_cell_height();
+    bool use_ttf = fonts::mono && fonts::mono->valid;
+    GlyphCache* gc = use_ttf ? fonts::mono->get_cache(fonts::TERM_SIZE) : nullptr;
+
     // Fill background
     uint32_t bg_px = colors::TERM_BG.to_pixel();
     int total = pw * ph;
@@ -431,8 +436,8 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
     }
 
     // Render each visible cell
-    int visible_rows = ph / FONT_HEIGHT;
-    int visible_cols = pw / FONT_WIDTH;
+    int visible_rows = ph / cell_h;
+    int visible_cols = pw / cell_w;
     if (visible_rows > t->rows) visible_rows = t->rows;
     if (visible_cols > t->cols) visible_cols = t->cols;
 
@@ -441,17 +446,16 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
             int idx = r * t->cols + c;
             TermCell& cell = t->cells[idx];
 
-            int px = c * FONT_WIDTH;
-            int py = r * FONT_HEIGHT;
+            int px = c * cell_w;
+            int py = r * cell_h;
 
             uint32_t cell_bg = cell.bg.to_pixel();
-            uint32_t cell_fg = cell.fg.to_pixel();
 
             // Draw cell background
-            for (int fy = 0; fy < FONT_HEIGHT; fy++) {
+            for (int fy = 0; fy < cell_h; fy++) {
                 int dy = py + fy;
                 if (dy >= ph) break;
-                for (int fx = 0; fx < FONT_WIDTH; fx++) {
+                for (int fx = 0; fx < cell_w; fx++) {
                     int dx = px + fx;
                     if (dx >= pw) break;
                     pixels[dy * pw + dx] = cell_bg;
@@ -460,16 +464,23 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
 
             // Draw character glyph
             if (cell.ch > 32 || cell.ch < 0) {
-                const uint8_t* glyph = &font_data[(unsigned char)cell.ch * FONT_HEIGHT];
-                for (int fy = 0; fy < FONT_HEIGHT; fy++) {
-                    int dy = py + fy;
-                    if (dy >= ph) break;
-                    uint8_t bits = glyph[fy];
-                    for (int fx = 0; fx < FONT_WIDTH; fx++) {
-                        if (bits & (0x80 >> fx)) {
-                            int dx = px + fx;
-                            if (dx >= pw) break;
-                            pixels[dy * pw + dx] = cell_fg;
+                if (use_ttf) {
+                    int baseline = py + gc->ascent;
+                    fonts::mono->draw_char_to_buffer(pixels, pw, ph,
+                        px, baseline, (unsigned char)cell.ch, cell.fg, gc);
+                } else {
+                    uint32_t cell_fg = cell.fg.to_pixel();
+                    const uint8_t* glyph = &font_data[(unsigned char)cell.ch * FONT_HEIGHT];
+                    for (int fy = 0; fy < FONT_HEIGHT; fy++) {
+                        int dy = py + fy;
+                        if (dy >= ph) break;
+                        uint8_t bits = glyph[fy];
+                        for (int fx = 0; fx < FONT_WIDTH; fx++) {
+                            if (bits & (0x80 >> fx)) {
+                                int dx = px + fx;
+                                if (dx >= pw) break;
+                                pixels[dy * pw + dx] = cell_fg;
+                            }
                         }
                     }
                 }
@@ -479,13 +490,13 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
 
     // Draw cursor
     if (t->cursor_visible && t->cursor_x < visible_cols && t->cursor_y < visible_rows) {
-        int cx = t->cursor_x * FONT_WIDTH;
-        int cy = t->cursor_y * FONT_HEIGHT;
+        int cx = t->cursor_x * cell_w;
+        int cy = t->cursor_y * cell_h;
         uint32_t cursor_px = colors::WHITE.to_pixel();
-        for (int fy = 0; fy < FONT_HEIGHT; fy++) {
+        for (int fy = 0; fy < cell_h; fy++) {
             int dy = cy + fy;
             if (dy >= ph) break;
-            for (int fx = 0; fx < FONT_WIDTH; fx++) {
+            for (int fx = 0; fx < cell_w; fx++) {
                 int dx = cx + fx;
                 if (dx >= pw) break;
                 pixels[dy * pw + dx] = cursor_px;
@@ -496,17 +507,23 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
             int idx = t->cursor_y * t->cols + t->cursor_x;
             char ch = t->cells[idx].ch;
             if (ch > 32 || ch < 0) {
-                const uint8_t* glyph = &font_data[(unsigned char)ch * FONT_HEIGHT];
-                uint32_t black_px = colors::BLACK.to_pixel();
-                for (int fy = 0; fy < FONT_HEIGHT; fy++) {
-                    int dy = cy + fy;
-                    if (dy >= ph) break;
-                    uint8_t bits = glyph[fy];
-                    for (int fx = 0; fx < FONT_WIDTH; fx++) {
-                        if (bits & (0x80 >> fx)) {
-                            int dx = cx + fx;
-                            if (dx >= pw) break;
-                            pixels[dy * pw + dx] = black_px;
+                if (use_ttf) {
+                    int baseline = cy + gc->ascent;
+                    fonts::mono->draw_char_to_buffer(pixels, pw, ph,
+                        cx, baseline, (unsigned char)ch, colors::BLACK, gc);
+                } else {
+                    const uint8_t* glyph = &font_data[(unsigned char)ch * FONT_HEIGHT];
+                    uint32_t black_px = colors::BLACK.to_pixel();
+                    for (int fy = 0; fy < FONT_HEIGHT; fy++) {
+                        int dy = cy + fy;
+                        if (dy >= ph) break;
+                        uint8_t bits = glyph[fy];
+                        for (int fx = 0; fx < FONT_WIDTH; fx++) {
+                            if (bits & (0x80 >> fx)) {
+                                int dx = cx + fx;
+                                if (dx >= pw) break;
+                                pixels[dy * pw + dx] = black_px;
+                            }
                         }
                     }
                 }
@@ -515,6 +532,58 @@ static inline void terminal_render(TerminalState* t, uint32_t* pixels, int pw, i
     }
 }
 
+static inline void terminal_resize(TerminalState* t, int new_cols, int new_rows) {
+    if (new_cols == t->cols && new_rows == t->rows) return;
+    if (new_cols < 1 || new_rows < 1) return;
+
+    int new_total = new_cols * new_rows;
+    TermCell* new_cells = (TermCell*)zenith::alloc(new_total * sizeof(TermCell));
+    TermCell* new_alt = (TermCell*)zenith::alloc(new_total * sizeof(TermCell));
+
+    // Clear new buffers
+    for (int i = 0; i < new_total; i++) {
+        new_cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
+        new_alt[i] = {' ', colors::TERM_FG, colors::TERM_BG};
+    }
+
+    // Copy existing content (as much as fits)
+    int copy_rows = t->rows < new_rows ? t->rows : new_rows;
+    int copy_cols = t->cols < new_cols ? t->cols : new_cols;
+
+    // If cursor is beyond the new grid, scroll content up to keep cursor visible
+    int row_offset = 0;
+    if (t->cursor_y >= new_rows) {
+        row_offset = t->cursor_y - new_rows + 1;
+    }
+
+    for (int r = 0; r < copy_rows && (r + row_offset) < t->rows; r++) {
+        for (int c = 0; c < copy_cols; c++) {
+            new_cells[r * new_cols + c] = t->cells[(r + row_offset) * t->cols + c];
+        }
+    }
+
+    if (t->cells) zenith::mfree(t->cells);
+    if (t->alt_cells) zenith::mfree(t->alt_cells);
+
+    t->cells = new_cells;
+    t->alt_cells = new_alt;
+
+    int old_cols = t->cols;
+    t->cols = new_cols;
+    t->rows = new_rows;
+
+    // Adjust cursor position
+    t->cursor_y -= row_offset;
+    if (t->cursor_x >= new_cols) t->cursor_x = new_cols - 1;
+    if (t->cursor_y >= new_rows) t->cursor_y = new_rows - 1;
+    if (t->cursor_y < 0) t->cursor_y = 0;
+
+    // Notify child process of new terminal size
+    if (t->child_pid > 0) {
+        zenith::childio_settermsz(t->child_pid, new_cols, new_rows);
+    }
+}
+
 static inline void terminal_handle_key(TerminalState* t, const Zenith::KeyEvent& key) {
     if (t->child_pid > 0) {
         zenith::childio_writekey(t->child_pid, &key);
diff --git a/programs/include/gui/truetype.hpp b/programs/include/gui/truetype.hpp
new file mode 100644
index 0000000..ef0192c
--- /dev/null
+++ b/programs/include/gui/truetype.hpp
@@ -0,0 +1,335 @@
+/*
+    * truetype.hpp
+    * ZenithOS TrueType font rendering via stb_truetype
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+#include <zenith/syscall.h>
+#include <zenith/heap.h>
+#include <zenith/string.h>
+#include "gui/gui.hpp"
+#include "gui/framebuffer.hpp"
+
+// Forward-declare stbtt_fontinfo to avoid including stb_truetype.h in every TU.
+// The actual struct is defined in stb_truetype.h and only used in truetype.hpp
+// method bodies (which are inline but only instantiated where stb_truetype.h
+// is also included — i.e. stb_truetype_impl.cpp). We include the full header
+// here since our inline methods need the complete type.
+#include "gui/stb_math.h"
+
+// We need the stb macros defined before including stb_truetype.h (header-only mode)
+#ifndef STBTT_ifloor
+#define STBTT_ifloor(x)   ((int) stb_floor(x))
+#define STBTT_iceil(x)    ((int) stb_ceil(x))
+#define STBTT_sqrt(x)     stb_sqrt(x)
+#define STBTT_pow(x,y)    stb_pow(x,y)
+#define STBTT_fmod(x,y)   stb_fmod(x,y)
+#define STBTT_cos(x)      stb_cos(x)
+#define STBTT_acos(x)     stb_acos(x)
+#define STBTT_fabs(x)     stb_fabs(x)
+#define STBTT_malloc(x,u)  ((void)(u), zenith::malloc(x))
+#define STBTT_free(x,u)    ((void)(u), zenith::mfree(x))
+#define STBTT_memcpy(d,s,n) zenith::memcpy(d,s,n)
+#define STBTT_memset(d,v,n) zenith::memset(d,v,n)
+#define STBTT_strlen(x)    zenith::slen(x)
+#define STBTT_assert(x)    ((void)(x))
+#endif
+
+#include "gui/stb_truetype.h"
+
+namespace gui {
+
+struct CachedGlyph {
+    uint8_t* bitmap;
+    int width, height;
+    int xoff, yoff;
+    int advance;
+    bool loaded;
+};
+
+struct GlyphCache {
+    CachedGlyph glyphs[128];
+    int pixel_size;
+    float scale;
+    int ascent, descent, line_gap;
+    int line_height;
+};
+
+struct TrueTypeFont {
+    stbtt_fontinfo info;
+    uint8_t* data;
+    GlyphCache caches[4];
+    int cache_count;
+    bool valid;
+
+    bool init(const char* vfs_path) {
+        valid = false;
+        data = nullptr;
+        cache_count = 0;
+
+        int fd = zenith::open(vfs_path);
+        if (fd < 0) return false;
+
+        uint64_t size = zenith::getsize(fd);
+        if (size == 0 || size > 1024 * 1024) {
+            zenith::close(fd);
+            return false;
+        }
+
+        data = (uint8_t*)zenith::alloc(size);
+        if (!data) {
+            zenith::close(fd);
+            return false;
+        }
+
+        zenith::read(fd, data, 0, size);
+        zenith::close(fd);
+
+        if (!stbtt_InitFont(&info, data, stbtt_GetFontOffsetForIndex(data, 0))) {
+            zenith::free(data);
+            data = nullptr;
+            return false;
+        }
+
+        valid = true;
+        return true;
+    }
+
+    GlyphCache* get_cache(int pixel_size) {
+        // Search existing caches
+        for (int i = 0; i < cache_count; i++) {
+            if (caches[i].pixel_size == pixel_size)
+                return &caches[i];
+        }
+
+        // Create new cache
+        if (cache_count >= 4) return &caches[0]; // fallback to first
+
+        GlyphCache* gc = &caches[cache_count++];
+        gc->pixel_size = pixel_size;
+        gc->scale = stbtt_ScaleForPixelHeight(&info, (float)pixel_size);
+
+        int asc, desc, lg;
+        stbtt_GetFontVMetrics(&info, &asc, &desc, &lg);
+        gc->ascent = (int)(asc * gc->scale);
+        gc->descent = (int)(desc * gc->scale);
+        gc->line_gap = (int)(lg * gc->scale);
+        gc->line_height = gc->ascent - gc->descent + gc->line_gap;
+
+        for (int i = 0; i < 128; i++) {
+            gc->glyphs[i].bitmap = nullptr;
+            gc->glyphs[i].loaded = false;
+        }
+
+        return gc;
+    }
+
+    CachedGlyph* get_glyph(GlyphCache* gc, int codepoint) {
+        if (codepoint < 0 || codepoint >= 128) return nullptr;
+        CachedGlyph* g = &gc->glyphs[codepoint];
+        if (g->loaded) return g;
+
+        g->loaded = true;
+        int advance, lsb;
+        stbtt_GetCodepointHMetrics(&info, codepoint, &advance, &lsb);
+        g->advance = (int)(advance * gc->scale);
+
+        int x0, y0, x1, y1;
+        stbtt_GetCodepointBitmapBox(&info, codepoint, gc->scale, gc->scale,
+                                     &x0, &y0, &x1, &y1);
+        g->width = x1 - x0;
+        g->height = y1 - y0;
+        g->xoff = x0;
+        g->yoff = y0;
+
+        if (g->width > 0 && g->height > 0) {
+            g->bitmap = (uint8_t*)zenith::malloc(g->width * g->height);
+            stbtt_MakeCodepointBitmap(&info, g->bitmap, g->width, g->height,
+                                      g->width, gc->scale, gc->scale, codepoint);
+        }
+
+        return g;
+    }
+
+    int measure_text(const char* text, int pixel_size) {
+        if (!valid) return 0;
+        GlyphCache* gc = get_cache(pixel_size);
+        int w = 0;
+        for (int i = 0; text[i]; i++) {
+            CachedGlyph* g = get_glyph(gc, (unsigned char)text[i]);
+            if (g) w += g->advance;
+        }
+        return w;
+    }
+
+    int get_line_height(int pixel_size) {
+        if (!valid) return 16;
+        GlyphCache* gc = get_cache(pixel_size);
+        return gc->line_height;
+    }
+
+    void draw(Framebuffer& fb, int x, int y, const char* text,
+              Color color, int pixel_size) {
+        if (!valid) return;
+        GlyphCache* gc = get_cache(pixel_size);
+        int cx = x;
+        int baseline = y + gc->ascent;
+
+        for (int i = 0; text[i]; i++) {
+            CachedGlyph* g = get_glyph(gc, (unsigned char)text[i]);
+            if (!g) continue;
+
+            if (g->bitmap) {
+                int gx = cx + g->xoff;
+                int gy = baseline + g->yoff;
+                for (int row = 0; row < g->height; row++) {
+                    for (int col = 0; col < g->width; col++) {
+                        uint8_t alpha = g->bitmap[row * g->width + col];
+                        if (alpha > 0) {
+                            Color c = {color.r, color.g, color.b, alpha};
+                            fb.put_pixel_alpha(gx + col, gy + row, c);
+                        }
+                    }
+                }
+            }
+            cx += g->advance;
+        }
+    }
+
+    void draw_bg(Framebuffer& fb, int x, int y, const char* text,
+                 Color fg, Color bg, int pixel_size) {
+        if (!valid) return;
+        GlyphCache* gc = get_cache(pixel_size);
+
+        // Fill background for the text extent
+        int tw = measure_text(text, pixel_size);
+        fb.fill_rect(x, y, tw, gc->line_height, bg);
+
+        // Then draw foreground
+        draw(fb, x, y, text, fg, pixel_size);
+    }
+
+    void draw_to_buffer(uint32_t* pixels, int buf_w, int buf_h,
+                        int x, int y, const char* text,
+                        Color color, int pixel_size) {
+        if (!valid) return;
+        GlyphCache* gc = get_cache(pixel_size);
+        int cx = x;
+        int baseline = y + gc->ascent;
+
+        for (int i = 0; text[i]; i++) {
+            CachedGlyph* g = get_glyph(gc, (unsigned char)text[i]);
+            if (!g) continue;
+
+            if (g->bitmap) {
+                int gx = cx + g->xoff;
+                int gy = baseline + g->yoff;
+                for (int row = 0; row < g->height; row++) {
+                    int dy = gy + row;
+                    if (dy < 0 || dy >= buf_h) continue;
+                    for (int col = 0; col < g->width; col++) {
+                        int dx = gx + col;
+                        if (dx < 0 || dx >= buf_w) continue;
+                        uint8_t alpha = g->bitmap[row * g->width + col];
+                        if (alpha == 0) continue;
+
+                        if (alpha == 255) {
+                            pixels[dy * buf_w + dx] =
+                                0xFF000000 | ((uint32_t)color.r << 16) |
+                                ((uint32_t)color.g << 8) | color.b;
+                        } else {
+                            uint32_t dst = pixels[dy * buf_w + dx];
+                            uint8_t dr = (dst >> 16) & 0xFF;
+                            uint8_t dg = (dst >> 8) & 0xFF;
+                            uint8_t db = dst & 0xFF;
+                            uint32_t a = alpha, inv_a = 255 - alpha;
+                            uint32_t rr = (a * color.r + inv_a * dr + 128) / 255;
+                            uint32_t gg = (a * color.g + inv_a * dg + 128) / 255;
+                            uint32_t bb = (a * color.b + inv_a * db + 128) / 255;
+                            pixels[dy * buf_w + dx] =
+                                0xFF000000 | (rr << 16) | (gg << 8) | bb;
+                        }
+                    }
+                }
+            }
+            cx += g->advance;
+        }
+    }
+
+    // Draw single character to buffer, returning advance width
+    int draw_char_to_buffer(uint32_t* pixels, int buf_w, int buf_h,
+                            int x, int baseline, int codepoint,
+                            Color color, GlyphCache* gc) {
+        CachedGlyph* g = get_glyph(gc, codepoint);
+        if (!g) return 0;
+
+        if (g->bitmap) {
+            int gx = x + g->xoff;
+            int gy = baseline + g->yoff;
+            for (int row = 0; row < g->height; row++) {
+                int dy = gy + row;
+                if (dy < 0 || dy >= buf_h) continue;
+                for (int col = 0; col < g->width; col++) {
+                    int dx = gx + col;
+                    if (dx < 0 || dx >= buf_w) continue;
+                    uint8_t alpha = g->bitmap[row * g->width + col];
+                    if (alpha == 0) continue;
+
+                    if (alpha == 255) {
+                        pixels[dy * buf_w + dx] =
+                            0xFF000000 | ((uint32_t)color.r << 16) |
+                            ((uint32_t)color.g << 8) | color.b;
+                    } else {
+                        uint32_t dst = pixels[dy * buf_w + dx];
+                        uint8_t dr = (dst >> 16) & 0xFF;
+                        uint8_t dg = (dst >> 8) & 0xFF;
+                        uint8_t db = dst & 0xFF;
+                        uint32_t a = alpha, inv_a = 255 - alpha;
+                        uint32_t rr = (a * color.r + inv_a * dr + 128) / 255;
+                        uint32_t gg = (a * color.g + inv_a * dg + 128) / 255;
+                        uint32_t bb = (a * color.b + inv_a * db + 128) / 255;
+                        pixels[dy * buf_w + dx] =
+                            0xFF000000 | (rr << 16) | (gg << 8) | bb;
+                    }
+                }
+            }
+        }
+        return g->advance;
+    }
+};
+
+// Global font manager
+namespace fonts {
+    inline TrueTypeFont* system_font = nullptr;
+    inline TrueTypeFont* system_bold = nullptr;
+    inline TrueTypeFont* mono = nullptr;
+    inline TrueTypeFont* mono_bold = nullptr;
+
+    inline int UI_SIZE    = 18;
+    inline int TITLE_SIZE = 18;
+    inline int TERM_SIZE  = 18;
+    inline int LARGE_SIZE = 28;
+
+    inline bool init() {
+        auto load = [](const char* path) -> TrueTypeFont* {
+            TrueTypeFont* f = (TrueTypeFont*)zenith::malloc(sizeof(TrueTypeFont));
+            zenith::memset(f, 0, sizeof(TrueTypeFont));
+            if (!f->init(path)) {
+                zenith::mfree(f);
+                return nullptr;
+            }
+            return f;
+        };
+
+        system_font = load("0:/fonts/Roboto-Medium.ttf");
+        system_bold = load("0:/fonts/Roboto-Bold.ttf");
+        mono        = load("0:/fonts/JetBrainsMono-Regular.ttf");
+        mono_bold   = load("0:/fonts/JetBrainsMono-Bold.ttf");
+
+        return system_font != nullptr;
+    }
+}
+
+} // namespace gui
diff --git a/programs/include/gui/widgets.hpp b/programs/include/gui/widgets.hpp
index 121ebf8..b46a6de 100644
--- a/programs/include/gui/widgets.hpp
+++ b/programs/include/gui/widgets.hpp
@@ -79,7 +79,7 @@ struct Button {
         // Center text
         int tw = text_width(text);
         int tx = bounds.x + (bounds.w - tw) / 2;
-        int ty = bounds.y + (bounds.h - FONT_HEIGHT) / 2;
+        int ty = bounds.y + (bounds.h - system_font_height()) / 2;
         draw_text(fb, tx, ty, text, fg);
     }
 
@@ -150,7 +150,7 @@ struct IconButton {
 
         // Draw text
         if (text) {
-            int ty = bounds.y + (bounds.h - FONT_HEIGHT) / 2;
+            int ty = bounds.y + (bounds.h - system_font_height()) / 2;
             draw_text(fb, content_x, ty, text, text_color);
         }
     }
@@ -206,13 +206,18 @@ struct TextBox {
 
         // Draw text with 4px padding
         int tx = bounds.x + 4;
-        int ty = bounds.y + (bounds.h - FONT_HEIGHT) / 2;
+        int fh = system_font_height();
+        int ty = bounds.y + (bounds.h - fh) / 2;
         draw_text(fb, tx, ty, text, fg);
 
         // Draw cursor if focused
         if (focused) {
-            int cx = tx + cursor * FONT_WIDTH;
-            draw_vline(fb, cx, ty, FONT_HEIGHT, cursor_color);
+            // Measure text up to cursor position for proportional fonts
+            char prefix[256];
+            for (int i = 0; i < cursor && i < 255; i++) prefix[i] = text[i];
+            prefix[cursor < 255 ? cursor : 255] = '\0';
+            int cx = tx + text_width(prefix);
+            draw_vline(fb, cx, ty, fh, cursor_color);
         }
     }
 
diff --git a/programs/include/gui/window.hpp b/programs/include/gui/window.hpp
index 904e78b..7fdc603 100644
--- a/programs/include/gui/window.hpp
+++ b/programs/include/gui/window.hpp
@@ -64,6 +64,9 @@ struct Window {
     WindowPollCallback  on_poll;
     void* app_data;
 
+    bool external;      // true = shared-memory window from external process
+    int  ext_win_id;    // window server ID (valid when external == true)
+
     Rect titlebar_rect() const {
         return {frame.x, frame.y, frame.w, TITLEBAR_HEIGHT};
     }
diff --git a/programs/include/zenith/syscall.h b/programs/include/zenith/syscall.h
index ec45d0e..0a9e3da 100644
--- a/programs/include/zenith/syscall.h
+++ b/programs/include/zenith/syscall.h
@@ -284,4 +284,38 @@ namespace zenith {
         return (int)syscall3(Zenith::SYS_CHILDIO_SETTERMSZ, (uint64_t)childPid, (uint64_t)cols, (uint64_t)rows);
     }
 
+    // Process listing / kill
+    inline int proclist(Zenith::ProcInfo* buf, int max) {
+        return (int)syscall2(Zenith::SYS_PROCLIST, (uint64_t)buf, (uint64_t)max);
+    }
+    inline int kill(int pid) {
+        return (int)syscall1(Zenith::SYS_KILL, (uint64_t)pid);
+    }
+    inline int devlist(Zenith::DevInfo* buf, int max) {
+        return (int)syscall2(Zenith::SYS_DEVLIST, (uint64_t)buf, (uint64_t)max);
+    }
+
+    // Window server
+    inline int win_create(const char* title, int w, int h, Zenith::WinCreateResult* result) {
+        return (int)syscall4(Zenith::SYS_WINCREATE, (uint64_t)title, (uint64_t)w, (uint64_t)h, (uint64_t)result);
+    }
+    inline int win_destroy(int id) {
+        return (int)syscall1(Zenith::SYS_WINDESTROY, (uint64_t)id);
+    }
+    inline int win_present(int id) {
+        return (int)syscall1(Zenith::SYS_WINPRESENT, (uint64_t)id);
+    }
+    inline int win_poll(int id, Zenith::WinEvent* event) {
+        return (int)syscall2(Zenith::SYS_WINPOLL, (uint64_t)id, (uint64_t)event);
+    }
+    inline int win_enumerate(Zenith::WinInfo* info, int max) {
+        return (int)syscall2(Zenith::SYS_WINENUM, (uint64_t)info, (uint64_t)max);
+    }
+    inline uint64_t win_map(int id) {
+        return (uint64_t)syscall1(Zenith::SYS_WINMAP, (uint64_t)id);
+    }
+    inline int win_sendevent(int id, const Zenith::WinEvent* event) {
+        return (int)syscall2(Zenith::SYS_WINSENDEVENT, (uint64_t)id, (uint64_t)event);
+    }
+
 }
diff --git a/programs/src/clear/main.cpp b/programs/src/clear/main.cpp
index a6210bc..0e1a5d3 100644
--- a/programs/src/clear/main.cpp
+++ b/programs/src/clear/main.cpp
@@ -1,26 +1,12 @@
 /*
     * main.cpp
-    * clear - Clear terminal screen and framebuffer
+    * clear - Clear terminal screen
     * Copyright (c) 2025-2026 Daniel Hammer
 */
 
 #include <zenith/syscall.h>
 
 extern "C" void _start() {
-    // Clear the raw framebuffer (needed after graphical programs like DOOM)
-    Zenith::FbInfo fb;
-    zenith::fb_info(&fb);
-    uint8_t* pixels = (uint8_t*)zenith::fb_map();
-    if (pixels) {
-        for (uint64_t y = 0; y < fb.height; y++) {
-            uint32_t* row = (uint32_t*)(pixels + y * fb.pitch);
-            for (uint64_t x = 0; x < fb.width; x++) {
-                row[x] = 0x00000000;
-            }
-        }
-    }
-
-    // Reset the text console
     zenith::print("\033[2J");   // Clear entire screen
     zenith::print("\033[H");    // Move cursor to top-left
     zenith::exit(0);
diff --git a/programs/src/desktop/Makefile b/programs/src/desktop/Makefile
index 4f43cd3..926befb 100644
--- a/programs/src/desktop/Makefile
+++ b/programs/src/desktop/Makefile
@@ -20,7 +20,7 @@ LINK_LD  := ../../link.ld
 BINDIR   := ../../bin
 OBJDIR   := obj
 
-# ---- Compiler flags ----
+# ---- C++ compiler flags ----
 
 CXXFLAGS := \
     -std=gnu++20 \
@@ -40,10 +40,8 @@ CXXFLAGS := \
     -fdata-sections \
     -m64 \
     -march=x86-64 \
-    -mno-80387 \
-    -mno-mmx \
-    -mno-sse \
-    -mno-sse2 \
+    -msse \
+    -msse2 \
     -mno-red-zone \
     -mcmodel=small \
     -I $(PROG_INC) \
@@ -61,9 +59,9 @@ LDFLAGS := \
     -z max-page-size=0x1000 \
     -T $(LINK_LD)
 
-# ---- Source files ----
+# ---- C++ source files ----
 
-SRCS := main.cpp font_data.cpp app_terminal.cpp app_filemanager.cpp app_sysinfo.cpp app_calculator.cpp app_texteditor.cpp app_klog.cpp app_wiki.cpp app_settings.cpp
+SRCS := main.cpp font_data.cpp stb_truetype_impl.cpp app_terminal.cpp app_filemanager.cpp app_sysinfo.cpp app_calculator.cpp app_texteditor.cpp app_klog.cpp app_wiki.cpp app_procmgr.cpp app_mandelbrot.cpp app_devexplorer.cpp app_settings.cpp app_doom.cpp
 OBJS := $(addprefix $(OBJDIR)/,$(SRCS:.cpp=.o))
 
 # ---- Target ----
@@ -78,6 +76,7 @@ $(TARGET): $(OBJS) $(LINK_LD) Makefile
 	mkdir -p $(BINDIR)/os
 	$(CXX) $(CXXFLAGS) $(LDFLAGS) $(OBJS) -o $@
 
+# C++ sources
 $(OBJDIR)/%.o: %.cpp Makefile
 	mkdir -p $(OBJDIR)
 	$(CXX) $(CXXFLAGS) -c $< -o $@
diff --git a/programs/src/desktop/app_calculator.cpp b/programs/src/desktop/app_calculator.cpp
index 6ddfad5..64685ea 100644
--- a/programs/src/desktop/app_calculator.cpp
+++ b/programs/src/desktop/app_calculator.cpp
@@ -231,10 +231,18 @@ static void calculator_on_draw(Window* win, Framebuffer& fb) {
     c.fill_rect(0, 0, c.w, CALC_DISPLAY_H, Color::from_rgb(0x2D, 0x2D, 0x2D));
 
     // Display text (right-aligned, 2x scale)
-    int text_len = zenith::slen(cs->display_str);
-    int text_w = text_len * FONT_WIDTH * 2;
+    int text_w;
+    int large_h;
+    if (fonts::system_font && fonts::system_font->valid) {
+        text_w = fonts::system_font->measure_text(cs->display_str, fonts::LARGE_SIZE);
+        large_h = fonts::system_font->get_line_height(fonts::LARGE_SIZE);
+    } else {
+        int text_len = zenith::slen(cs->display_str);
+        text_w = text_len * FONT_WIDTH * 2;
+        large_h = FONT_HEIGHT * 2;
+    }
     int tx = c.w - text_w - 12;
-    int ty = (CALC_DISPLAY_H - FONT_HEIGHT * 2) / 2;
+    int ty = (CALC_DISPLAY_H - large_h) / 2;
     if (tx < 4) tx = 4;
     c.text_2x(tx, ty, cs->display_str, colors::WHITE);
 
@@ -271,9 +279,9 @@ static void calculator_on_draw(Window* win, Framebuffer& fb) {
             // Button text
             const char* label = calc_labels[row][col];
             Color label_color = (col == 3) ? colors::WHITE : colors::TEXT_COLOR;
-            int label_w = zenith::slen(label) * FONT_WIDTH;
+            int label_w = text_width(label);
             int lx = bx + (bw - label_w) / 2;
-            int ly = by + (CALC_BTN_H - FONT_HEIGHT) / 2;
+            int ly = by + (CALC_BTN_H - system_font_height()) / 2;
             c.text(lx, ly, label, label_color);
         }
     }
diff --git a/programs/src/desktop/app_devexplorer.cpp b/programs/src/desktop/app_devexplorer.cpp
new file mode 100644
index 0000000..71818be
--- /dev/null
+++ b/programs/src/desktop/app_devexplorer.cpp
@@ -0,0 +1,475 @@
+/*
+    * app_devexplorer.cpp
+    * ZenithOS Desktop - Device Explorer (lists hardware detected by the kernel)
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include "apps_common.hpp"
+
+// ============================================================================
+// Device Explorer state
+// ============================================================================
+
+static constexpr int DE_TOOLBAR_H = 36;
+static constexpr int DE_CAT_H    = 28;
+static constexpr int DE_ITEM_H   = 24;
+static constexpr int DE_MAX_DEVS = 64;
+static constexpr int DE_POLL_MS  = 2000;
+static constexpr int DE_INDENT   = 28;
+
+// Category names matching DevInfo.category values
+static const char* category_names[] = {
+    "CPU",          // 0
+    "Interrupt",    // 1
+    "Timer",        // 2
+    "Input",        // 3
+    "USB",          // 4
+    "Network",      // 5
+    "Display",      // 6
+    "PCI",          // 7
+};
+static constexpr int NUM_CATEGORIES = 8;
+
+static Color category_colors[] = {
+    Color::from_rgb(0x33, 0x66, 0xCC),  // CPU - blue
+    Color::from_rgb(0x88, 0x44, 0xAA),  // Interrupt - purple
+    Color::from_rgb(0x22, 0x88, 0x22),  // Timer - green
+    Color::from_rgb(0xCC, 0x88, 0x00),  // Input - amber
+    Color::from_rgb(0x00, 0x88, 0x88),  // USB - teal
+    Color::from_rgb(0xCC, 0x55, 0x22),  // Network - orange
+    Color::from_rgb(0x44, 0x66, 0xCC),  // Display - indigo
+    Color::from_rgb(0x66, 0x66, 0x66),  // PCI - gray
+};
+
+struct DevExplorerState {
+    DesktopState* desktop;
+    Zenith::DevInfo devs[DE_MAX_DEVS];
+    int dev_count;
+    bool collapsed[NUM_CATEGORIES]; // per-category collapse state
+    int selected_row;               // index into visible display rows (-1 = none)
+    int scroll_y;                   // scroll offset in display rows
+    uint64_t last_poll_ms;
+};
+
+// ============================================================================
+// Display row model
+// ============================================================================
+
+enum RowType { ROW_CATEGORY, ROW_DEVICE };
+
+struct DisplayRow {
+    RowType type;
+    int category;   // category index (0..7)
+    int dev_index;  // index into devs[] (only valid for ROW_DEVICE)
+};
+
+static constexpr int MAX_DISPLAY_ROWS = DE_MAX_DEVS + NUM_CATEGORIES;
+
+static int build_display_rows(DevExplorerState* de, DisplayRow* rows) {
+    int count = 0;
+    for (int cat = 0; cat < NUM_CATEGORIES; cat++) {
+        // Count devices in this category
+        int cat_count = 0;
+        for (int d = 0; d < de->dev_count; d++) {
+            if (de->devs[d].category == cat) cat_count++;
+        }
+        if (cat_count == 0) continue;
+
+        // Emit category header
+        rows[count].type = ROW_CATEGORY;
+        rows[count].category = cat;
+        rows[count].dev_index = -1;
+        count++;
+
+        // Emit device rows if expanded
+        if (!de->collapsed[cat]) {
+            for (int d = 0; d < de->dev_count; d++) {
+                if (de->devs[d].category == cat) {
+                    rows[count].type = ROW_DEVICE;
+                    rows[count].category = cat;
+                    rows[count].dev_index = d;
+                    count++;
+                }
+            }
+        }
+    }
+    return count;
+}
+
+// ============================================================================
+// Triangle drawing helpers
+// ============================================================================
+
+static void draw_triangle_right(Canvas& c, int x, int y, int size, Color col) {
+    // Right-pointing filled triangle (▶)
+    int half = size / 2;
+    for (int row = 0; row < size; row++) {
+        int dist = (row <= half) ? row : (size - 1 - row);
+        for (int col_px = 0; col_px <= dist; col_px++) {
+            c.put_pixel(x + col_px, y + row, col);
+        }
+    }
+}
+
+static void draw_triangle_down(Canvas& c, int x, int y, int size, Color col) {
+    // Down-pointing filled triangle (▼)
+    int half = size / 2;
+    for (int row = 0; row < half + 1; row++) {
+        int w = size - row * 2;
+        for (int col_px = 0; col_px < w; col_px++) {
+            c.put_pixel(x + row + col_px, y + row, col);
+        }
+    }
+}
+
+// ============================================================================
+// Callbacks
+// ============================================================================
+
+static void devexplorer_on_poll(Window* win) {
+    DevExplorerState* de = (DevExplorerState*)win->app_data;
+    if (!de) return;
+
+    uint64_t now = zenith::get_milliseconds();
+    if (now - de->last_poll_ms < DE_POLL_MS) return;
+    de->last_poll_ms = now;
+
+    de->dev_count = zenith::devlist(de->devs, DE_MAX_DEVS);
+}
+
+static void devexplorer_on_draw(Window* win, Framebuffer& fb) {
+    DevExplorerState* de = (DevExplorerState*)win->app_data;
+    if (!de) return;
+
+    Canvas c(win);
+    c.fill(colors::WINDOW_BG);
+
+    int fh = system_font_height();
+
+    // --- Toolbar ---
+    c.fill_rect(0, 0, c.w, DE_TOOLBAR_H, Color::from_rgb(0xF5, 0xF5, 0xF5));
+    c.hline(0, DE_TOOLBAR_H - 1, c.w, colors::BORDER);
+
+    // "Refresh" button
+    int btn_w = 80;
+    int btn_h = 26;
+    int btn_x = 8;
+    int btn_y = (DE_TOOLBAR_H - btn_h) / 2;
+    c.button(btn_x, btn_y, btn_w, btn_h, "Refresh",
+             Color::from_rgb(0x33, 0x66, 0xCC), colors::WHITE, 4);
+
+    // Device count on right
+    char count_str[24];
+    snprintf(count_str, sizeof(count_str), "%d devices", de->dev_count);
+    int cw = text_width(count_str);
+    c.text(c.w - cw - 12, (DE_TOOLBAR_H - fh) / 2, count_str, colors::TEXT_COLOR);
+
+    // --- Build display rows ---
+    DisplayRow rows[MAX_DISPLAY_ROWS];
+    int row_count = build_display_rows(de, rows);
+
+    // --- Compute visible area ---
+    int list_y = DE_TOOLBAR_H;
+    int list_h = c.h - list_y;
+    if (list_h < 1) return;
+
+    // Clamp scroll
+    // Calculate total content height
+    int total_h = 0;
+    for (int i = 0; i < row_count; i++) {
+        total_h += (rows[i].type == ROW_CATEGORY) ? DE_CAT_H : DE_ITEM_H;
+    }
+    int max_scroll_px = total_h - list_h;
+    if (max_scroll_px < 0) max_scroll_px = 0;
+
+    // Convert scroll_y (in rows) to pixel offset for simplicity,
+    // but keep the row-based model: scroll_y = row offset
+    // We'll compute cumulative pixel offsets
+    int scroll_px = 0;
+    for (int i = 0; i < de->scroll_y && i < row_count; i++) {
+        scroll_px += (rows[i].type == ROW_CATEGORY) ? DE_CAT_H : DE_ITEM_H;
+    }
+    if (scroll_px > max_scroll_px) {
+        scroll_px = max_scroll_px;
+        // Recalculate scroll_y to match
+        de->scroll_y = 0;
+        int acc = 0;
+        for (int i = 0; i < row_count; i++) {
+            int rh = (rows[i].type == ROW_CATEGORY) ? DE_CAT_H : DE_ITEM_H;
+            if (acc + rh > max_scroll_px) break;
+            acc += rh;
+            de->scroll_y = i + 1;
+        }
+    }
+    if (de->scroll_y < 0) de->scroll_y = 0;
+
+    // Clamp selected_row
+    if (de->selected_row >= row_count) de->selected_row = row_count - 1;
+
+    // --- Draw rows ---
+    int draw_y = list_y - scroll_px;
+    // Advance to first visible area by recomputing from scroll offset
+    draw_y = list_y;
+    int first_visible = de->scroll_y;
+
+    // Compute starting y by accumulating heights of skipped rows
+    // Actually, let's just iterate all rows and skip those above the viewport
+    draw_y = list_y;
+    for (int i = 0; i < first_visible && i < row_count; i++) {
+        draw_y -= (rows[i].type == ROW_CATEGORY) ? DE_CAT_H : DE_ITEM_H;
+    }
+
+    // Draw from first_visible onward
+    int cur_y = list_y;
+    for (int i = first_visible; i < row_count; i++) {
+        int row_h = (rows[i].type == ROW_CATEGORY) ? DE_CAT_H : DE_ITEM_H;
+        if (cur_y >= c.h) break; // Past bottom of window
+
+        if (rows[i].type == ROW_CATEGORY) {
+            // Category header
+            int cat = rows[i].category;
+            c.fill_rect(0, cur_y, c.w, DE_CAT_H, Color::from_rgb(0xF0, 0xF0, 0xF0));
+
+            // Highlight if selected
+            if (i == de->selected_row) {
+                c.fill_rect(0, cur_y, c.w, DE_CAT_H, colors::MENU_HOVER);
+            }
+
+            // Expand/collapse triangle
+            int tri_x = 10;
+            int tri_y = cur_y + (DE_CAT_H - 8) / 2;
+            Color tri_color = Color::from_rgb(0x55, 0x55, 0x55);
+            if (de->collapsed[cat]) {
+                draw_triangle_right(c, tri_x, tri_y, 8, tri_color);
+            } else {
+                draw_triangle_down(c, tri_x, tri_y, 8, tri_color);
+            }
+
+            // Colored dot
+            int dot_x = 24;
+            int dot_y = cur_y + (DE_CAT_H - 8) / 2;
+            Color cat_col = (cat >= 0 && cat < NUM_CATEGORIES)
+                            ? category_colors[cat] : colors::TEXT_COLOR;
+            c.fill_rounded_rect(dot_x, dot_y, 8, 8, 4, cat_col);
+
+            // Category name
+            const char* cat_name = (cat >= 0 && cat < NUM_CATEGORIES)
+                                   ? category_names[cat] : "?";
+            int text_y = cur_y + (DE_CAT_H - fh) / 2;
+            c.text(36, text_y, cat_name, Color::from_rgb(0x33, 0x33, 0x33));
+
+            // Device count in parentheses on right
+            int cat_count = 0;
+            for (int d = 0; d < de->dev_count; d++) {
+                if (de->devs[d].category == cat) cat_count++;
+            }
+            char cnt_buf[16];
+            snprintf(cnt_buf, sizeof(cnt_buf), "(%d)", cat_count);
+            int name_w = text_width(cat_name);
+            c.text(36 + name_w + 8, text_y, cnt_buf,
+                   Color::from_rgb(0x88, 0x88, 0x88));
+
+            // Bottom border
+            c.hline(0, cur_y + DE_CAT_H - 1, c.w, Color::from_rgb(0xE0, 0xE0, 0xE0));
+        } else {
+            // Device item row
+            int di = rows[i].dev_index;
+
+            // Selected row highlight
+            if (i == de->selected_row) {
+                c.fill_rect(0, cur_y, c.w, DE_ITEM_H, colors::MENU_HOVER);
+            }
+
+            int text_y = cur_y + (DE_ITEM_H - fh) / 2;
+
+            // Device name (indented)
+            c.text(DE_INDENT + 10, text_y, de->devs[di].name, colors::TEXT_COLOR);
+
+            // Detail string (right column, gray)
+            int detail_x = c.w / 2 + 20;
+            c.text(detail_x, text_y, de->devs[di].detail,
+                   Color::from_rgb(0x66, 0x66, 0x66));
+        }
+
+        cur_y += row_h;
+    }
+
+    // --- Scrollbar ---
+    if (total_h > list_h) {
+        int sb_x = c.w - 6;
+        int thumb_h = (list_h * list_h) / total_h;
+        if (thumb_h < 20) thumb_h = 20;
+        int thumb_y = list_y + (scroll_px * (list_h - thumb_h)) / max_scroll_px;
+        c.fill_rect(sb_x, list_y, 4, list_h, Color::from_rgb(0xE0, 0xE0, 0xE0));
+        c.fill_rect(sb_x, thumb_y, 4, thumb_h, Color::from_rgb(0xAA, 0xAA, 0xAA));
+    }
+}
+
+static void devexplorer_on_mouse(Window* win, MouseEvent& ev) {
+    DevExplorerState* de = (DevExplorerState*)win->app_data;
+    if (!de) return;
+
+    Rect cr = win->content_rect();
+    int lx = ev.x - cr.x;
+    int ly = ev.y - cr.y;
+
+    // Scroll
+    if (ev.scroll != 0) {
+        de->scroll_y -= ev.scroll;
+        if (de->scroll_y < 0) de->scroll_y = 0;
+        return;
+    }
+
+    if (ev.left_pressed()) {
+        // Check "Refresh" button click
+        int btn_w = 80;
+        int btn_h = 26;
+        int btn_x = 8;
+        int btn_y = (DE_TOOLBAR_H - btn_h) / 2;
+        Rect btn_rect = {btn_x, btn_y, btn_w, btn_h};
+        if (btn_rect.contains(lx, ly)) {
+            de->last_poll_ms = 0; // force refresh
+            return;
+        }
+
+        // Check row click in list area
+        int list_y = DE_TOOLBAR_H;
+        if (ly >= list_y) {
+            // Build display rows to map click to row
+            DisplayRow rows[MAX_DISPLAY_ROWS];
+            int row_count = build_display_rows(de, rows);
+
+            // Walk rows from scroll offset, accumulating y
+            int cur_y = list_y;
+            for (int i = de->scroll_y; i < row_count; i++) {
+                int row_h = (rows[i].type == ROW_CATEGORY) ? DE_CAT_H : DE_ITEM_H;
+                if (ly >= cur_y && ly < cur_y + row_h) {
+                    // Hit this row
+                    if (rows[i].type == ROW_CATEGORY) {
+                        // Toggle collapse
+                        int cat = rows[i].category;
+                        de->collapsed[cat] = !de->collapsed[cat];
+                        de->selected_row = -1;
+                    } else {
+                        de->selected_row = i;
+                    }
+                    return;
+                }
+                cur_y += row_h;
+                if (cur_y >= win->content_h) break;
+            }
+            // Clicked below all rows
+            de->selected_row = -1;
+        }
+    }
+}
+
+static void devexplorer_on_key(Window* win, const Zenith::KeyEvent& key) {
+    DevExplorerState* de = (DevExplorerState*)win->app_data;
+    if (!de || !key.pressed) return;
+
+    DisplayRow rows[MAX_DISPLAY_ROWS];
+    int row_count = build_display_rows(de, rows);
+    if (row_count == 0) return;
+
+    if (key.scancode == 0x48) { // Up arrow
+        if (de->selected_row <= 0) {
+            de->selected_row = 0;
+        } else {
+            de->selected_row--;
+        }
+        // Scroll to keep selection visible
+        if (de->selected_row < de->scroll_y) {
+            de->scroll_y = de->selected_row;
+        }
+    } else if (key.scancode == 0x50) { // Down arrow
+        if (de->selected_row < row_count - 1) {
+            de->selected_row++;
+        }
+        // Scroll to keep selection visible — estimate visible rows
+        int list_h = win->content_h - DE_TOOLBAR_H;
+        int cur_h = 0;
+        int last_visible = de->scroll_y;
+        for (int i = de->scroll_y; i < row_count; i++) {
+            int rh = (rows[i].type == ROW_CATEGORY) ? DE_CAT_H : DE_ITEM_H;
+            if (cur_h + rh > list_h) break;
+            cur_h += rh;
+            last_visible = i;
+        }
+        if (de->selected_row > last_visible) {
+            de->scroll_y += (de->selected_row - last_visible);
+        }
+    } else if (key.scancode == 0x4B) { // Left arrow — collapse
+        if (de->selected_row >= 0 && de->selected_row < row_count) {
+            int cat = rows[de->selected_row].category;
+            if (!de->collapsed[cat]) {
+                de->collapsed[cat] = true;
+                // If we were on a device row, move selection to the category header
+                if (rows[de->selected_row].type == ROW_DEVICE) {
+                    // Find the category header row for this category
+                    for (int i = de->selected_row - 1; i >= 0; i--) {
+                        if (rows[i].type == ROW_CATEGORY && rows[i].category == cat) {
+                            de->selected_row = i;
+                            break;
+                        }
+                    }
+                    // After collapsing, rebuild and clamp
+                    int new_count = build_display_rows(de, rows);
+                    if (de->selected_row >= new_count)
+                        de->selected_row = new_count - 1;
+                }
+            }
+        }
+    } else if (key.scancode == 0x4D) { // Right arrow — expand
+        if (de->selected_row >= 0 && de->selected_row < row_count) {
+            int cat = rows[de->selected_row].category;
+            de->collapsed[cat] = false;
+        }
+    } else if (key.scancode == 0x1C) { // Enter — toggle on category row
+        if (de->selected_row >= 0 && de->selected_row < row_count) {
+            if (rows[de->selected_row].type == ROW_CATEGORY) {
+                int cat = rows[de->selected_row].category;
+                de->collapsed[cat] = !de->collapsed[cat];
+            }
+        }
+    }
+}
+
+static void devexplorer_on_close(Window* win) {
+    if (win->app_data) {
+        zenith::mfree(win->app_data);
+        win->app_data = nullptr;
+    }
+}
+
+// ============================================================================
+// Device Explorer launcher
+// ============================================================================
+
+void open_devexplorer(DesktopState* ds) {
+    int idx = desktop_create_window(ds, "Devices", 140, 70, 640, 460);
+    if (idx < 0) return;
+
+    Window* win = &ds->windows[idx];
+
+    DevExplorerState* de = (DevExplorerState*)zenith::malloc(sizeof(DevExplorerState));
+    zenith::memset(de, 0, sizeof(DevExplorerState));
+    de->desktop = ds;
+    de->selected_row = -1;
+    de->scroll_y = 0;
+    de->last_poll_ms = 0;
+
+    // All categories start expanded
+    for (int i = 0; i < NUM_CATEGORIES; i++)
+        de->collapsed[i] = false;
+
+    // Initial poll
+    de->dev_count = zenith::devlist(de->devs, DE_MAX_DEVS);
+
+    win->app_data = de;
+    win->on_draw = devexplorer_on_draw;
+    win->on_mouse = devexplorer_on_mouse;
+    win->on_key = devexplorer_on_key;
+    win->on_close = devexplorer_on_close;
+    win->on_poll = devexplorer_on_poll;
+}
diff --git a/programs/src/desktop/app_doom.cpp b/programs/src/desktop/app_doom.cpp
new file mode 100644
index 0000000..c5d7804
--- /dev/null
+++ b/programs/src/desktop/app_doom.cpp
@@ -0,0 +1,12 @@
+/*
+    * app_doom.cpp
+    * ZenithOS Desktop - DOOM launcher (spawns standalone doom.elf)
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include "apps_common.hpp"
+
+void open_doom(DesktopState* ds) {
+    (void)ds;
+    zenith::spawn("0:/games/doom.elf");
+}
diff --git a/programs/src/desktop/app_filemanager.cpp b/programs/src/desktop/app_filemanager.cpp
index 2c2220e..b50e5c7 100644
--- a/programs/src/desktop/app_filemanager.cpp
+++ b/programs/src/desktop/app_filemanager.cpp
@@ -373,7 +373,7 @@ static void filemanager_on_draw(Window* win, Framebuffer& fb) {
             int tx = cell_x + (FM_GRID_CELL_W - tw) / 2;
             if (tx < cell_x) tx = cell_x;
             int ty = icon_y + FM_GRID_ICON + 2;
-            if (ty >= list_y && ty + FONT_HEIGHT <= c.h)
+            if (ty >= list_y && ty + system_font_height() <= c.h)
                 c.text(tx, ty, label, colors::TEXT_COLOR);
         }
     } else {
@@ -447,19 +447,20 @@ static void filemanager_on_draw(Window* win, Framebuffer& fb) {
 
             // Name
             int tx = 30;
-            int ty = iy + (FM_ITEM_H - FONT_HEIGHT) / 2;
-            if (ty >= list_y && ty + FONT_HEIGHT <= c.h)
+            int fm_sfh = system_font_height();
+            int ty = iy + (FM_ITEM_H - fm_sfh) / 2;
+            if (ty >= list_y && ty + fm_sfh <= c.h)
                 c.text(tx, ty, fm->entry_names[i], colors::TEXT_COLOR);
 
             // Size
-            if (size_col_x > 100 && !fm->is_dir[i] && ty >= list_y && ty + FONT_HEIGHT <= c.h) {
+            if (size_col_x > 100 && !fm->is_dir[i] && ty >= list_y && ty + fm_sfh <= c.h) {
                 char size_str[16];
                 format_size(size_str, fm->entry_sizes[i]);
                 c.text(size_col_x, ty, size_str, dim);
             }
 
             // Type
-            if (type_col_x > 160 && ty >= list_y && ty + FONT_HEIGHT <= c.h) {
+            if (type_col_x > 160 && ty >= list_y && ty + fm_sfh <= c.h) {
                 const char* type_str = "File";
                 if (fm->entry_types[i] == 1) type_str = "Dir";
                 else if (fm->entry_types[i] == 2) type_str = "Exec";
diff --git a/programs/src/desktop/app_klog.cpp b/programs/src/desktop/app_klog.cpp
index bdb2097..6c0c495 100644
--- a/programs/src/desktop/app_klog.cpp
+++ b/programs/src/desktop/app_klog.cpp
@@ -119,8 +119,8 @@ void open_klog(DesktopState* ds) {
 
     Window* win = &ds->windows[idx];
     Rect cr = win->content_rect();
-    int cols = cr.w / FONT_WIDTH;
-    int rows = cr.h / FONT_HEIGHT;
+    int cols = cr.w / mono_cell_width();
+    int rows = cr.h / mono_cell_height();
 
     KlogState* klog = (KlogState*)zenith::malloc(sizeof(KlogState));
     zenith::memset(klog, 0, sizeof(KlogState));
diff --git a/programs/src/desktop/app_mandelbrot.cpp b/programs/src/desktop/app_mandelbrot.cpp
new file mode 100644
index 0000000..add2146
--- /dev/null
+++ b/programs/src/desktop/app_mandelbrot.cpp
@@ -0,0 +1,296 @@
+/*
+    * app_mandelbrot.cpp
+    * ZenithOS Desktop - Mandelbrot set visualizer
+    * Supports zoom (scroll wheel), pan (drag), and reset (R key)
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include "apps_common.hpp"
+
+// ============================================================================
+// Fixed-point Mandelbrot (avoids FPU/SSE dependency issues)
+// Uses 28.36 fixed-point: 36 fractional bits gives ~1e-10 precision
+// ============================================================================
+
+using fp_t = int64_t;
+static constexpr int FP_SHIFT = 36;
+static constexpr fp_t FP_ONE = (fp_t)1 << FP_SHIFT;
+
+static inline fp_t fp_from_int(int v) { return (fp_t)v << FP_SHIFT; }
+
+static inline fp_t fp_mul(fp_t a, fp_t b) {
+    // Split to avoid overflow: a * b >> SHIFT
+    // Use 128-bit intermediate via compiler builtin
+    __int128 r = (__int128)a * b;
+    return (fp_t)(r >> FP_SHIFT);
+}
+
+// fp_div for small numerators (avoids __divti3 by using 64-bit division)
+// Only valid when a is small enough that a << FP_SHIFT fits in int64_t
+static inline fp_t fp_div_small(int a, int b) {
+    return ((fp_t)a << FP_SHIFT) / (fp_t)b;
+}
+
+// ============================================================================
+// State
+// ============================================================================
+
+static constexpr int MB_MAX_ITER = 256;
+static constexpr int MB_TOOLBAR_H = 32;
+
+struct MandelbrotState {
+    DesktopState* desktop;
+    fp_t center_x, center_y;   // center of view in fractal coords
+    fp_t scale;                 // units per pixel (fixed-point)
+    int max_iter;
+    bool needs_render;
+    // Drag state
+    bool dragging;
+    int drag_start_x, drag_start_y;
+    fp_t drag_start_cx, drag_start_cy;
+};
+
+// ============================================================================
+// Color palette
+// ============================================================================
+
+static uint32_t mandelbrot_color(int iter, int max_iter) {
+    if (iter >= max_iter) return 0xFF000000; // black for inside set
+
+    // Smooth cycling palette using bit manipulation
+    int t = (iter * 7) & 0xFF;
+    int phase = (iter * 7) >> 8;
+
+    uint8_t r, g, b;
+    switch (phase % 6) {
+    case 0: r = 255; g = (uint8_t)t; b = 0; break;
+    case 1: r = (uint8_t)(255 - t); g = 255; b = 0; break;
+    case 2: r = 0; g = 255; b = (uint8_t)t; break;
+    case 3: r = 0; g = (uint8_t)(255 - t); b = 255; break;
+    case 4: r = (uint8_t)t; g = 0; b = 255; break;
+    default: r = 255; g = 0; b = (uint8_t)(255 - t); break;
+    }
+
+    return 0xFF000000 | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
+}
+
+// ============================================================================
+// Render
+// ============================================================================
+
+static void mandelbrot_render(MandelbrotState* mb, uint32_t* pixels, int w, int h) {
+    int render_h = h - MB_TOOLBAR_H;
+    if (render_h <= 0) return;
+
+    fp_t half_w = fp_mul(fp_from_int(w / 2), mb->scale);
+    fp_t half_h = fp_mul(fp_from_int(render_h / 2), mb->scale);
+    fp_t x_min = mb->center_x - half_w;
+    fp_t y_min = mb->center_y - half_h;
+    fp_t bailout = fp_from_int(4);
+
+    for (int py = 0; py < render_h; py++) {
+        fp_t ci = y_min + fp_mul(fp_from_int(py), mb->scale);
+        uint32_t* row = pixels + (py + MB_TOOLBAR_H) * w;
+
+        for (int px = 0; px < w; px++) {
+            fp_t cr = x_min + fp_mul(fp_from_int(px), mb->scale);
+
+            fp_t zr = 0, zi = 0;
+            int iter = 0;
+
+            while (iter < mb->max_iter) {
+                fp_t zr2 = fp_mul(zr, zr);
+                fp_t zi2 = fp_mul(zi, zi);
+                if (zr2 + zi2 > bailout) break;
+                fp_t new_zr = zr2 - zi2 + cr;
+                zi = fp_mul(fp_from_int(2), fp_mul(zr, zi)) + ci;
+                zr = new_zr;
+                iter++;
+            }
+
+            row[px] = mandelbrot_color(iter, mb->max_iter);
+        }
+    }
+
+    mb->needs_render = false;
+}
+
+// ============================================================================
+// Callbacks
+// ============================================================================
+
+static void mb_on_draw(Window* win, Framebuffer& fb) {
+    MandelbrotState* mb = (MandelbrotState*)win->app_data;
+    if (!mb) return;
+
+    Canvas c(win);
+
+    if (mb->needs_render) {
+        mandelbrot_render(mb, win->content, c.w, c.h);
+    }
+
+    // Draw toolbar over the render
+    c.fill_rect(0, 0, c.w, MB_TOOLBAR_H, Color::from_rgb(0xF5, 0xF5, 0xF5));
+    c.hline(0, MB_TOOLBAR_H - 1, c.w, colors::BORDER);
+
+    // Reset button
+    c.button(8, 4, 60, 24, "Reset", colors::ACCENT, colors::WHITE, 4);
+
+    // Iter +/- buttons
+    char iter_str[24];
+    snprintf(iter_str, sizeof(iter_str), "Iter: %d", mb->max_iter);
+    int fh = system_font_height();
+    c.text(80, (MB_TOOLBAR_H - fh) / 2, iter_str, colors::TEXT_COLOR);
+
+    int iter_text_w = text_width(iter_str);
+    int btn_x = 80 + iter_text_w + 8;
+    c.button(btn_x, 4, 24, 24, "-", Color::from_rgb(0xAA, 0xAA, 0xAA), colors::WHITE, 4);
+    c.button(btn_x + 28, 4, 24, 24, "+", Color::from_rgb(0xAA, 0xAA, 0xAA), colors::WHITE, 4);
+
+    // Hint
+    const char* hint = "Scroll=zoom  Drag=pan";
+    int hw = text_width(hint);
+    c.text(c.w - hw - 8, (MB_TOOLBAR_H - fh) / 2, hint, Color::from_rgb(0x99, 0x99, 0x99));
+}
+
+static void mb_on_mouse(Window* win, MouseEvent& ev) {
+    MandelbrotState* mb = (MandelbrotState*)win->app_data;
+    if (!mb) return;
+
+    Rect cr = win->content_rect();
+    int lx = ev.x - cr.x;
+    int ly = ev.y - cr.y;
+
+    // Handle toolbar clicks
+    if (ev.left_pressed() && ly < MB_TOOLBAR_H) {
+        // Reset button
+        Rect reset_r = {8, 4, 60, 24};
+        if (reset_r.contains(lx, ly)) {
+            mb->center_x = -fp_from_int(1) / 2; // -0.5
+            mb->center_y = 0;
+            mb->scale = fp_div_small(3, cr.w > 0 ? cr.w : 400);
+            mb->max_iter = MB_MAX_ITER;
+            mb->needs_render = true;
+            return;
+        }
+
+        // Iter buttons
+        char iter_str[24];
+        snprintf(iter_str, sizeof(iter_str), "Iter: %d", mb->max_iter);
+        int iter_text_w = text_width(iter_str);
+        int btn_x = 80 + iter_text_w + 8;
+
+        Rect minus_r = {btn_x, 4, 24, 24};
+        Rect plus_r = {btn_x + 28, 4, 24, 24};
+
+        if (minus_r.contains(lx, ly)) {
+            if (mb->max_iter > 32) { mb->max_iter /= 2; mb->needs_render = true; }
+            return;
+        }
+        if (plus_r.contains(lx, ly)) {
+            if (mb->max_iter < 4096) { mb->max_iter *= 2; mb->needs_render = true; }
+            return;
+        }
+        return;
+    }
+
+    // Drag panning
+    if (ev.left_pressed() && ly >= MB_TOOLBAR_H) {
+        mb->dragging = true;
+        mb->drag_start_x = lx;
+        mb->drag_start_y = ly;
+        mb->drag_start_cx = mb->center_x;
+        mb->drag_start_cy = mb->center_y;
+        return;
+    }
+
+    if (mb->dragging && ev.left_held()) {
+        int dx = lx - mb->drag_start_x;
+        int dy = ly - mb->drag_start_y;
+        mb->center_x = mb->drag_start_cx - fp_mul(fp_from_int(dx), mb->scale);
+        mb->center_y = mb->drag_start_cy - fp_mul(fp_from_int(dy), mb->scale);
+        mb->needs_render = true;
+        return;
+    }
+
+    if (mb->dragging && !ev.left_held()) {
+        mb->dragging = false;
+    }
+
+    // Scroll zoom (centered on mouse position)
+    if (ev.scroll != 0 && ly >= MB_TOOLBAR_H) {
+        int render_h = cr.h - MB_TOOLBAR_H;
+        // Mouse position in fractal coords before zoom
+        fp_t mx_frac = mb->center_x + fp_mul(fp_from_int(lx - cr.w / 2), mb->scale);
+        fp_t my_frac = mb->center_y + fp_mul(fp_from_int((ly - MB_TOOLBAR_H) - render_h / 2), mb->scale);
+
+        if (ev.scroll < 0) {
+            // Zoom in
+            mb->scale = fp_mul(mb->scale, fp_from_int(3) / 4); // * 0.75
+        } else {
+            // Zoom out
+            mb->scale = fp_mul(mb->scale, fp_from_int(4) / 3); // * 1.33
+        }
+
+        // Adjust center so mouse stays at same fractal point
+        fp_t new_mx = mb->center_x + fp_mul(fp_from_int(lx - cr.w / 2), mb->scale);
+        fp_t new_my = mb->center_y + fp_mul(fp_from_int((ly - MB_TOOLBAR_H) - render_h / 2), mb->scale);
+        mb->center_x += mx_frac - new_mx;
+        mb->center_y += my_frac - new_my;
+
+        mb->needs_render = true;
+    }
+}
+
+static void mb_on_key(Window* win, const Zenith::KeyEvent& key) {
+    MandelbrotState* mb = (MandelbrotState*)win->app_data;
+    if (!mb || !key.pressed) return;
+
+    if (key.ascii == 'r' || key.ascii == 'R') {
+        Rect cr = win->content_rect();
+        mb->center_x = -fp_from_int(1) / 2;
+        mb->center_y = 0;
+        mb->scale = fp_div_small(3, cr.w > 0 ? cr.w : 400);
+        mb->max_iter = MB_MAX_ITER;
+        mb->needs_render = true;
+    } else if (key.ascii == '+' || key.ascii == '=') {
+        if (mb->max_iter < 4096) { mb->max_iter *= 2; mb->needs_render = true; }
+    } else if (key.ascii == '-') {
+        if (mb->max_iter > 32) { mb->max_iter /= 2; mb->needs_render = true; }
+    }
+}
+
+static void mb_on_close(Window* win) {
+    if (win->app_data) {
+        zenith::mfree(win->app_data);
+        win->app_data = nullptr;
+    }
+}
+
+// ============================================================================
+// Mandelbrot launcher
+// ============================================================================
+
+void open_mandelbrot(DesktopState* ds) {
+    int idx = desktop_create_window(ds, "Mandelbrot", 120, 60, 500, 400);
+    if (idx < 0) return;
+
+    Window* win = &ds->windows[idx];
+    Rect cr = win->content_rect();
+
+    MandelbrotState* mb = (MandelbrotState*)zenith::malloc(sizeof(MandelbrotState));
+    zenith::memset(mb, 0, sizeof(MandelbrotState));
+    mb->desktop = ds;
+    mb->center_x = -fp_from_int(1) / 2; // -0.5
+    mb->center_y = 0;
+    mb->scale = fp_div_small(3, cr.w > 0 ? cr.w : 400);
+    mb->max_iter = MB_MAX_ITER;
+    mb->needs_render = true;
+    mb->dragging = false;
+
+    win->app_data = mb;
+    win->on_draw = mb_on_draw;
+    win->on_mouse = mb_on_mouse;
+    win->on_key = mb_on_key;
+    win->on_close = mb_on_close;
+}
diff --git a/programs/src/desktop/app_procmgr.cpp b/programs/src/desktop/app_procmgr.cpp
new file mode 100644
index 0000000..aaac948
--- /dev/null
+++ b/programs/src/desktop/app_procmgr.cpp
@@ -0,0 +1,244 @@
+/*
+    * app_procmgr.cpp
+    * ZenithOS Desktop - Process Manager
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include "apps_common.hpp"
+
+// ============================================================================
+// Process Manager state
+// ============================================================================
+
+static constexpr int PM_TOOLBAR_H = 36;
+static constexpr int PM_HEADER_H  = 24;
+static constexpr int PM_ITEM_H    = 28;
+static constexpr int PM_MAX_PROCS = 16;
+static constexpr int PM_POLL_MS   = 1000;
+
+struct ProcMgrState {
+    DesktopState* desktop;
+    Zenith::ProcInfo procs[PM_MAX_PROCS];
+    int proc_count;
+    int selected;          // selected row index (-1 = none)
+    uint64_t last_poll_ms;
+};
+
+// ============================================================================
+// Callbacks
+// ============================================================================
+
+static void procmgr_on_poll(Window* win) {
+    ProcMgrState* pm = (ProcMgrState*)win->app_data;
+    if (!pm) return;
+
+    uint64_t now = zenith::get_milliseconds();
+    if (now - pm->last_poll_ms < PM_POLL_MS) return;
+    pm->last_poll_ms = now;
+
+    // Remember previously selected PID
+    int prev_pid = -1;
+    if (pm->selected >= 0 && pm->selected < pm->proc_count) {
+        prev_pid = pm->procs[pm->selected].pid;
+    }
+
+    pm->proc_count = zenith::proclist(pm->procs, PM_MAX_PROCS);
+
+    // Restore selection by matching PID
+    pm->selected = -1;
+    if (prev_pid >= 0) {
+        for (int i = 0; i < pm->proc_count; i++) {
+            if (pm->procs[i].pid == prev_pid) {
+                pm->selected = i;
+                break;
+            }
+        }
+    }
+}
+
+static void procmgr_on_draw(Window* win, Framebuffer& fb) {
+    ProcMgrState* pm = (ProcMgrState*)win->app_data;
+    if (!pm) return;
+
+    Canvas c(win);
+    c.fill(colors::WINDOW_BG);
+
+    int fh = system_font_height();
+
+    // --- Toolbar ---
+    c.fill_rect(0, 0, c.w, PM_TOOLBAR_H, Color::from_rgb(0xF5, 0xF5, 0xF5));
+    c.hline(0, PM_TOOLBAR_H - 1, c.w, colors::BORDER);
+
+    // "End Process" button
+    int btn_w = 100;
+    int btn_h = 26;
+    int btn_x = 8;
+    int btn_y = (PM_TOOLBAR_H - btn_h) / 2;
+    Color btn_bg = (pm->selected >= 0 && pm->procs[pm->selected].pid != 0)
+        ? Color::from_rgb(0xCC, 0x33, 0x33)
+        : Color::from_rgb(0xAA, 0xAA, 0xAA);
+    c.button(btn_x, btn_y, btn_w, btn_h, "End Process", btn_bg, colors::WHITE, 4);
+
+    // Process count on right
+    char count_str[24];
+    snprintf(count_str, sizeof(count_str), "%d processes", pm->proc_count);
+    int cw = text_width(count_str);
+    c.text(c.w - cw - 12, (PM_TOOLBAR_H - fh) / 2, count_str, colors::TEXT_COLOR);
+
+    // --- Header row ---
+    int header_y = PM_TOOLBAR_H;
+    c.fill_rect(0, header_y, c.w, PM_HEADER_H, Color::from_rgb(0xF0, 0xF0, 0xF0));
+
+    int col_pid = 12;
+    int col_name = 64;
+    int col_mem = c.w - 120;
+    int col_state = c.w - 52;
+
+    int ty = header_y + (PM_HEADER_H - fh) / 2;
+    c.text(col_pid, ty, "PID", Color::from_rgb(0x66, 0x66, 0x66));
+    c.text(col_name, ty, "Name", Color::from_rgb(0x66, 0x66, 0x66));
+    c.text(col_mem, ty, "Mem", Color::from_rgb(0x66, 0x66, 0x66));
+    c.text(col_state, ty, "St", Color::from_rgb(0x66, 0x66, 0x66));
+
+    c.hline(0, header_y + PM_HEADER_H - 1, c.w, colors::BORDER);
+
+    // --- Process rows ---
+    int list_y = PM_TOOLBAR_H + PM_HEADER_H;
+    for (int i = 0; i < pm->proc_count; i++) {
+        int row_y = list_y + i * PM_ITEM_H;
+        if (row_y + PM_ITEM_H > c.h) break;
+
+        // Selected row highlight
+        if (i == pm->selected) {
+            c.fill_rect(0, row_y, c.w, PM_ITEM_H, colors::MENU_HOVER);
+        }
+
+        int ry = row_y + (PM_ITEM_H - fh) / 2;
+
+        // PID (right-aligned in PID column)
+        char pid_str[8];
+        snprintf(pid_str, sizeof(pid_str), "%d", (int)pm->procs[i].pid);
+        int pid_w = text_width(pid_str);
+        c.text(col_pid + 32 - pid_w, ry, pid_str, colors::TEXT_COLOR);
+
+        // Name (truncated to fit)
+        c.text(col_name, ry, pm->procs[i].name, colors::TEXT_COLOR);
+
+        // Memory
+        char mem_str[16];
+        format_size(mem_str, (int)pm->procs[i].heapUsed);
+        c.text(col_mem, ry, mem_str, colors::TEXT_COLOR);
+
+        // State
+        const char* st_str;
+        Color st_color;
+        switch (pm->procs[i].state) {
+        case 2: // Running
+            st_str = "Run";
+            st_color = Color::from_rgb(0x22, 0x88, 0x22);
+            break;
+        case 1: // Ready
+            st_str = "Rdy";
+            st_color = Color::from_rgb(0x33, 0x66, 0xCC);
+            break;
+        case 3: // Terminated
+            st_str = "Term";
+            st_color = Color::from_rgb(0xCC, 0x33, 0x33);
+            break;
+        default:
+            st_str = "?";
+            st_color = colors::TEXT_COLOR;
+            break;
+        }
+        c.text(col_state, ry, st_str, st_color);
+    }
+}
+
+static void procmgr_on_mouse(Window* win, MouseEvent& ev) {
+    ProcMgrState* pm = (ProcMgrState*)win->app_data;
+    if (!pm) return;
+
+    Rect cr = win->content_rect();
+    int lx = ev.x - cr.x;
+    int ly = ev.y - cr.y;
+
+    if (ev.left_pressed()) {
+        // Check "End Process" button click
+        int btn_w = 100;
+        int btn_h = 26;
+        int btn_x = 8;
+        int btn_y = (PM_TOOLBAR_H - btn_h) / 2;
+        Rect btn_rect = {btn_x, btn_y, btn_w, btn_h};
+        if (btn_rect.contains(lx, ly)) {
+            if (pm->selected >= 0 && pm->selected < pm->proc_count
+                && pm->procs[pm->selected].pid != 0) {
+                zenith::kill(pm->procs[pm->selected].pid);
+                pm->last_poll_ms = 0; // force refresh
+            }
+            return;
+        }
+
+        // Check row click
+        int list_y = PM_TOOLBAR_H + PM_HEADER_H;
+        if (ly >= list_y) {
+            int row = (ly - list_y) / PM_ITEM_H;
+            if (row >= 0 && row < pm->proc_count) {
+                pm->selected = row;
+            } else {
+                pm->selected = -1;
+            }
+        }
+    }
+}
+
+static void procmgr_on_key(Window* win, const Zenith::KeyEvent& key) {
+    ProcMgrState* pm = (ProcMgrState*)win->app_data;
+    if (!pm || !key.pressed) return;
+
+    if (key.scancode == 0x48) { // Up arrow
+        if (pm->selected > 0) pm->selected--;
+        else if (pm->proc_count > 0) pm->selected = 0;
+    } else if (key.scancode == 0x50) { // Down arrow
+        if (pm->selected < pm->proc_count - 1) pm->selected++;
+    } else if (key.scancode == 0x53) { // Delete key
+        if (pm->selected >= 0 && pm->selected < pm->proc_count
+            && pm->procs[pm->selected].pid != 0) {
+            zenith::kill(pm->procs[pm->selected].pid);
+            pm->last_poll_ms = 0; // force refresh
+        }
+    }
+}
+
+static void procmgr_on_close(Window* win) {
+    if (win->app_data) {
+        zenith::mfree(win->app_data);
+        win->app_data = nullptr;
+    }
+}
+
+// ============================================================================
+// Process Manager launcher
+// ============================================================================
+
+void open_procmgr(DesktopState* ds) {
+    int idx = desktop_create_window(ds, "Processes", 180, 80, 520, 400);
+    if (idx < 0) return;
+
+    Window* win = &ds->windows[idx];
+
+    ProcMgrState* pm = (ProcMgrState*)zenith::malloc(sizeof(ProcMgrState));
+    zenith::memset(pm, 0, sizeof(ProcMgrState));
+    pm->desktop = ds;
+    pm->selected = -1;
+    pm->last_poll_ms = 0;
+
+    // Initial poll
+    pm->proc_count = zenith::proclist(pm->procs, PM_MAX_PROCS);
+
+    win->app_data = pm;
+    win->on_draw = procmgr_on_draw;
+    win->on_mouse = procmgr_on_mouse;
+    win->on_key = procmgr_on_key;
+    win->on_close = procmgr_on_close;
+    win->on_poll = procmgr_on_poll;
+}
diff --git a/programs/src/desktop/app_settings.cpp b/programs/src/desktop/app_settings.cpp
index 3f9cec9..0cddcf7 100644
--- a/programs/src/desktop/app_settings.cpp
+++ b/programs/src/desktop/app_settings.cpp
@@ -1,38 +1,252 @@
 /*
     * app_settings.cpp
-    * ZenithOS Desktop - About application
+    * ZenithOS Desktop - Settings application
     * Copyright (c) 2026 Daniel Hammer
 */
 
 #include "apps_common.hpp"
 
 // ============================================================================
-// About state and callbacks
+// Settings state
 // ============================================================================
 
-struct AboutState {
+struct SettingsState {
+    DesktopState* desktop;
+    int active_tab;        // 0=Appearance, 1=Display, 2=About
     Zenith::SysInfo sys_info;
     uint64_t uptime_ms;
 };
 
-static void about_on_draw(Window* win, Framebuffer& fb) {
-    AboutState* st = (AboutState*)win->app_data;
-    if (!st) return;
+// ============================================================================
+// Color palette presets
+// ============================================================================
 
+static constexpr int SWATCH_COUNT = 8;
+static constexpr int SWATCH_SIZE = 24;
+static constexpr int SWATCH_GAP = 6;
+
+// Background colors (light tones)
+static const Color bg_palette[SWATCH_COUNT] = {
+    Color::from_rgb(0xD0, 0xD8, 0xE8),  // light blue-gray (default)
+    Color::from_rgb(0xE8, 0xDD, 0xCB),  // warm beige
+    Color::from_rgb(0xC8, 0xE6, 0xD0),  // mint green
+    Color::from_rgb(0xD8, 0xD0, 0xE8),  // lavender
+    Color::from_rgb(0xB8, 0xBE, 0xC8),  // slate
+    Color::from_rgb(0xF0, 0xF0, 0xF0),  // white
+    Color::from_rgb(0xE8, 0xD0, 0xD8),  // soft pink
+    Color::from_rgb(0xE8, 0xE0, 0xC8),  // light gold
+};
+
+// Panel colors (dark tones)
+static const Color panel_palette[SWATCH_COUNT] = {
+    Color::from_rgb(0x2B, 0x3E, 0x50),  // dark blue-gray (default)
+    Color::from_rgb(0x2D, 0x2D, 0x2D),  // dark charcoal
+    Color::from_rgb(0x1B, 0x2A, 0x4A),  // navy
+    Color::from_rgb(0x1A, 0x3A, 0x3A),  // dark teal
+    Color::from_rgb(0x1A, 0x3A, 0x1A),  // dark green
+    Color::from_rgb(0x30, 0x20, 0x40),  // dark purple
+    Color::from_rgb(0x40, 0x1A, 0x1A),  // dark red
+    Color::from_rgb(0x10, 0x10, 0x10),  // black
+};
+
+// Accent colors
+static const Color accent_palette[SWATCH_COUNT] = {
+    Color::from_rgb(0x36, 0x7B, 0xF0),  // blue (default)
+    Color::from_rgb(0x00, 0x9B, 0x9B),  // teal
+    Color::from_rgb(0x2E, 0x9E, 0x3E),  // green
+    Color::from_rgb(0xE0, 0x8A, 0x20),  // orange
+    Color::from_rgb(0xD0, 0x3E, 0x3E),  // red
+    Color::from_rgb(0x7B, 0x3E, 0xB8),  // purple
+    Color::from_rgb(0xD0, 0x5C, 0x9E),  // pink
+    Color::from_rgb(0x44, 0x44, 0xCC),  // indigo
+};
+
+// ============================================================================
+// Layout constants
+// ============================================================================
+
+static constexpr int TAB_BAR_H = 36;
+static constexpr int TAB_COUNT = 3;
+static const char* tab_labels[TAB_COUNT] = { "Appearance", "Display", "About" };
+
+// ============================================================================
+// Helper: check if two colors match
+// ============================================================================
+
+static bool color_eq(Color a, Color b) {
+    return a.r == b.r && a.g == b.g && a.b == b.b;
+}
+
+// ============================================================================
+// Helper: find selected swatch index in a palette
+// ============================================================================
+
+static int find_swatch(const Color* palette, Color current) {
+    for (int i = 0; i < SWATCH_COUNT; i++) {
+        if (color_eq(palette[i], current)) return i;
+    }
+    return -1;
+}
+
+// ============================================================================
+// Drawing
+// ============================================================================
+
+static void draw_swatch_row(Canvas& c, int x, int y, const Color* palette,
+                             Color selected, Color accent) {
+    int sel = find_swatch(palette, selected);
+    for (int i = 0; i < SWATCH_COUNT; i++) {
+        int sx = x + i * (SWATCH_SIZE + SWATCH_GAP);
+        // Draw selection border
+        if (i == sel) {
+            c.fill_rounded_rect(sx - 2, y - 2, SWATCH_SIZE + 4, SWATCH_SIZE + 4, 4, accent);
+        }
+        c.fill_rounded_rect(sx, y, SWATCH_SIZE, SWATCH_SIZE, 3, palette[i]);
+        // Thin border for light colors
+        c.rect(sx, y, SWATCH_SIZE, SWATCH_SIZE, Color::from_rgb(0xCC, 0xCC, 0xCC));
+    }
+}
+
+static void draw_radio(Canvas& c, int x, int y, bool selected, Color accent) {
+    int r = 7;
+    // Outer circle (simple square approximation with rounded rect)
+    c.fill_rounded_rect(x, y, r * 2, r * 2, r, Color::from_rgb(0xCC, 0xCC, 0xCC));
+    c.fill_rounded_rect(x + 1, y + 1, r * 2 - 2, r * 2 - 2, r - 1, colors::WHITE);
+    if (selected) {
+        c.fill_rounded_rect(x + 4, y + 4, r * 2 - 8, r * 2 - 8, r - 4, accent);
+    }
+}
+
+static void draw_toggle_btn(Canvas& c, int x, int y, int bw, int bh,
+                              const char* label, bool active, Color accent) {
+    Color bg = active ? accent : colors::WINDOW_BG;
+    Color fg = active ? colors::WHITE : colors::TEXT_COLOR;
+    c.fill_rounded_rect(x, y, bw, bh, 4, bg);
+    if (!active) {
+        c.rect(x, y, bw, bh, colors::BORDER);
+    }
+    int tw = text_width(label);
+    int fh = system_font_height();
+    c.text(x + (bw - tw) / 2, y + (bh - fh) / 2, label, fg);
+}
+
+static void settings_draw_appearance(Canvas& c, SettingsState* st) {
+    DesktopSettings& s = st->desktop->settings;
+    Color accent = s.accent_color;
+    int x = 16;
+    int y = 12;
+    int sfh = system_font_height();
+    int line_h = sfh + 10;
+
+    // Section: Background
+    c.text(x, y, "Background", colors::TEXT_COLOR);
+    y += line_h;
+
+    // Radio buttons: Gradient / Solid
+    draw_radio(c, x, y, s.bg_gradient, accent);
+    c.text(x + 20, y + 2, "Gradient", colors::TEXT_COLOR);
+
+    draw_radio(c, x + 120, y, !s.bg_gradient, accent);
+    c.text(x + 140, y + 2, "Solid Color", colors::TEXT_COLOR);
+    y += line_h + 4;
+
+    if (s.bg_gradient) {
+        // Top color swatches
+        c.text(x, y + 4, "Top", Color::from_rgb(0x88, 0x88, 0x88));
+        draw_swatch_row(c, x + 70, y, bg_palette, s.bg_grad_top, accent);
+        y += SWATCH_SIZE + 14;
+
+        // Bottom color swatches
+        c.text(x, y + 4, "Bottom", Color::from_rgb(0x88, 0x88, 0x88));
+        draw_swatch_row(c, x + 70, y, bg_palette, s.bg_grad_bottom, accent);
+        y += SWATCH_SIZE + 14;
+    } else {
+        // Solid color swatches
+        c.text(x, y + 4, "Color", Color::from_rgb(0x88, 0x88, 0x88));
+        draw_swatch_row(c, x + 70, y, bg_palette, s.bg_solid, accent);
+        y += SWATCH_SIZE + 14;
+    }
+
+    // Separator
+    c.hline(x, y, c.w - 2 * x, colors::BORDER);
+    y += 12;
+
+    // Panel color
+    c.text(x, y + 4, "Panel Color", colors::TEXT_COLOR);
+    draw_swatch_row(c, x + 110, y, panel_palette, s.panel_color, accent);
+    y += SWATCH_SIZE + 14;
+
+    // Separator
+    c.hline(x, y, c.w - 2 * x, colors::BORDER);
+    y += 12;
+
+    // Accent color
+    c.text(x, y + 4, "Accent Color", colors::TEXT_COLOR);
+    draw_swatch_row(c, x + 110, y, accent_palette, s.accent_color, accent);
+}
+
+static void apply_ui_scale(int scale) {
+    switch (scale) {
+    case 0: fonts::UI_SIZE=14; fonts::TITLE_SIZE=14; fonts::TERM_SIZE=14; fonts::LARGE_SIZE=22; break;
+    case 2: fonts::UI_SIZE=22; fonts::TITLE_SIZE=22; fonts::TERM_SIZE=22; fonts::LARGE_SIZE=34; break;
+    default: fonts::UI_SIZE=18; fonts::TITLE_SIZE=18; fonts::TERM_SIZE=18; fonts::LARGE_SIZE=28; break;
+    }
+}
+
+static void settings_draw_display(Canvas& c, SettingsState* st) {
+    DesktopSettings& s = st->desktop->settings;
+    Color accent = s.accent_color;
+    int x = 16;
+    int y = 20;
+    int btn_w = 60;
+    int btn_h = 28;
+
+    // Window Shadows
+    c.text(x, y + 6, "Window Shadows", colors::TEXT_COLOR);
+    int bx = x + 180;
+    draw_toggle_btn(c, bx, y, btn_w, btn_h, "On", s.show_shadows, accent);
+    draw_toggle_btn(c, bx + btn_w + 8, y, btn_w, btn_h, "Off", !s.show_shadows, accent);
+    y += btn_h + 20;
+
+    // Separator
+    c.hline(x, y, c.w - 2 * x, colors::BORDER);
+    y += 16;
+
+    // Clock Format
+    c.text(x, y + 6, "Clock Format", colors::TEXT_COLOR);
+    bx = x + 180;
+    draw_toggle_btn(c, bx, y, btn_w, btn_h, "24h", s.clock_24h, accent);
+    draw_toggle_btn(c, bx + btn_w + 8, y, btn_w, btn_h, "12h", !s.clock_24h, accent);
+    y += btn_h + 20;
+
+    // Separator
+    c.hline(x, y, c.w - 2 * x, colors::BORDER);
+    y += 16;
+
+    // UI Scale
+    c.text(x, y + 6, "UI Scale", colors::TEXT_COLOR);
+    bx = x + 180;
+    int sbw = 68;
+    draw_toggle_btn(c, bx, y, sbw, btn_h, "Small", s.ui_scale == 0, accent);
+    draw_toggle_btn(c, bx + sbw + 8, y, sbw, btn_h, "Default", s.ui_scale == 1, accent);
+    draw_toggle_btn(c, bx + (sbw + 8) * 2, y, sbw, btn_h, "Large", s.ui_scale == 2, accent);
+}
+
+static void settings_draw_about(Canvas& c, SettingsState* st) {
     st->uptime_ms = zenith::get_milliseconds();
 
-    Canvas c(win);
-    c.fill(colors::WINDOW_BG);
-
     Color dim = Color::from_rgb(0x88, 0x88, 0x88);
     int x = 16;
     int y = 20;
     char line[128];
-    int line_h = FONT_HEIGHT + 6;
+    int sfh = system_font_height();
+    int line_h = sfh + 6;
 
     // OS name in 2x size
-    c.text_2x(x, y, st->sys_info.osName, colors::ACCENT);
-    y += FONT_HEIGHT * 2 + 8;
+    c.text_2x(x, y, st->sys_info.osName, st->desktop->settings.accent_color);
+    int large_h = (fonts::system_font && fonts::system_font->valid)
+        ? fonts::system_font->get_line_height(fonts::LARGE_SIZE) : (FONT_HEIGHT * 2);
+    y += large_h + 8;
 
     snprintf(line, sizeof(line), "Version %s", st->sys_info.osVersion);
     c.text(x, y, line, colors::TEXT_COLOR);
@@ -41,27 +255,231 @@ static void about_on_draw(Window* win, Framebuffer& fb) {
     c.hline(x, y, c.w - 2 * x, colors::BORDER);
     y += 12;
 
-    snprintf(line, sizeof(line), "API version:  %d", (int)st->sys_info.apiVersion);
+    snprintf(line, sizeof(line), "API version: %d", (int)st->sys_info.apiVersion);
     c.kv_line(x, &y, line, colors::TEXT_COLOR, line_h);
 
     int up_sec = (int)(st->uptime_ms / 1000);
     int up_min = up_sec / 60;
     int up_hr = up_min / 60;
-    snprintf(line, sizeof(line), "Uptime:       %d:%02d:%02d", up_hr, up_min % 60, up_sec % 60);
+    snprintf(line, sizeof(line), "Uptime: %d:%02d:%02d", up_hr, up_min % 60, up_sec % 60);
     c.kv_line(x, &y, line, colors::TEXT_COLOR, line_h);
 
-    snprintf(line, sizeof(line), "Build:        %s %s", __DATE__, __TIME__);
+    snprintf(line, sizeof(line), "Build: %s %s", __DATE__, __TIME__);
     c.text(x, y, line, colors::TEXT_COLOR);
     y += line_h + 16;
 
     c.hline(x, y, c.w - 2 * x, colors::BORDER);
     y += 12;
 
-    c.kv_line(x, &y, "A hobby operating system built from scratch.", dim, line_h);
     c.text(x, y, "Copyright (c) 2026 Daniel Hammer", dim);
 }
 
-static void about_on_close(Window* win) {
+static void settings_on_draw(Window* win, Framebuffer& fb) {
+    SettingsState* st = (SettingsState*)win->app_data;
+    if (!st) return;
+
+    Canvas c(win);
+    c.fill(colors::WINDOW_BG);
+
+    Color accent = st->desktop->settings.accent_color;
+    int sfh = system_font_height();
+
+    // Draw tab bar background
+    c.fill_rect(0, 0, c.w, TAB_BAR_H, Color::from_rgb(0xF5, 0xF5, 0xF5));
+    c.hline(0, TAB_BAR_H - 1, c.w, colors::BORDER);
+
+    // Draw tabs
+    int tab_w = c.w / TAB_COUNT;
+    for (int i = 0; i < TAB_COUNT; i++) {
+        int tx = i * tab_w;
+        bool active = (i == st->active_tab);
+
+        if (active) {
+            c.fill_rect(tx, 0, tab_w, TAB_BAR_H, colors::WINDOW_BG);
+            // Active tab underline
+            c.fill_rect(tx + 4, TAB_BAR_H - 3, tab_w - 8, 3, accent);
+        }
+
+        int tw = text_width(tab_labels[i]);
+        Color tc = active ? accent : Color::from_rgb(0x66, 0x66, 0x66);
+        c.text(tx + (tab_w - tw) / 2, (TAB_BAR_H - sfh) / 2, tab_labels[i], tc);
+    }
+
+    // Draw tab content below the tab bar
+    // Create a sub-canvas offset by TAB_BAR_H
+    Canvas content(win->content + TAB_BAR_H * win->content_w,
+                   win->content_w, win->content_h - TAB_BAR_H);
+
+    switch (st->active_tab) {
+    case 0: settings_draw_appearance(content, st); break;
+    case 1: settings_draw_display(content, st); break;
+    case 2: settings_draw_about(content, st); break;
+    }
+}
+
+// ============================================================================
+// Mouse interaction
+// ============================================================================
+
+static bool swatch_hit(int mx, int my, int row_x, int row_y, int* out_idx) {
+    for (int i = 0; i < SWATCH_COUNT; i++) {
+        int sx = row_x + i * (SWATCH_SIZE + SWATCH_GAP);
+        if (mx >= sx && mx < sx + SWATCH_SIZE && my >= row_y && my < row_y + SWATCH_SIZE) {
+            *out_idx = i;
+            return true;
+        }
+    }
+    return false;
+}
+
+static void settings_on_mouse(Window* win, MouseEvent& ev) {
+    SettingsState* st = (SettingsState*)win->app_data;
+    if (!st) return;
+
+    if (!ev.left_pressed()) return;
+
+    Rect cr = win->content_rect();
+    int mx = ev.x - cr.x;
+    int my = ev.y - cr.y;
+
+    // Tab bar click
+    if (my >= 0 && my < TAB_BAR_H) {
+        int tab_w = win->content_w / TAB_COUNT;
+        int tab = mx / tab_w;
+        if (tab >= 0 && tab < TAB_COUNT) {
+            st->active_tab = tab;
+        }
+        return;
+    }
+
+    // Content area (offset by TAB_BAR_H)
+    int cy = my - TAB_BAR_H;
+    DesktopSettings& s = st->desktop->settings;
+
+    if (st->active_tab == 0) {
+        // Appearance tab
+        int x = 16;
+        int sfh = system_font_height();
+        int line_h = sfh + 10;
+        int y = 12;
+
+        // "Background" label
+        y += line_h;
+
+        // Radio: Gradient
+        if (mx >= x && mx < x + 100 && cy >= y && cy < y + 16) {
+            s.bg_gradient = true;
+            return;
+        }
+        // Radio: Solid
+        if (mx >= x + 120 && mx < x + 260 && cy >= y && cy < y + 16) {
+            s.bg_gradient = false;
+            return;
+        }
+        y += line_h + 4;
+
+        int idx;
+        if (s.bg_gradient) {
+            // Top swatches
+            if (swatch_hit(mx, cy, x + 70, y, &idx)) {
+                s.bg_grad_top = bg_palette[idx];
+                return;
+            }
+            y += SWATCH_SIZE + 14;
+
+            // Bottom swatches
+            if (swatch_hit(mx, cy, x + 70, y, &idx)) {
+                s.bg_grad_bottom = bg_palette[idx];
+                return;
+            }
+            y += SWATCH_SIZE + 14;
+        } else {
+            // Solid color swatches
+            if (swatch_hit(mx, cy, x + 70, y, &idx)) {
+                s.bg_solid = bg_palette[idx];
+                return;
+            }
+            y += SWATCH_SIZE + 14;
+        }
+
+        // Separator
+        y += 12;
+
+        // Panel color swatches
+        if (swatch_hit(mx, cy, x + 110, y, &idx)) {
+            s.panel_color = panel_palette[idx];
+            return;
+        }
+        y += SWATCH_SIZE + 14;
+
+        // Separator
+        y += 12;
+
+        // Accent color swatches
+        if (swatch_hit(mx, cy, x + 110, y, &idx)) {
+            s.accent_color = accent_palette[idx];
+            return;
+        }
+    } else if (st->active_tab == 1) {
+        // Display tab
+        int x = 16;
+        int y = 20;
+        int btn_w = 60;
+        int btn_h = 28;
+        int bx = x + 180;
+
+        // Window Shadows: On
+        if (mx >= bx && mx < bx + btn_w && cy >= y && cy < y + btn_h) {
+            s.show_shadows = true;
+            return;
+        }
+        // Window Shadows: Off
+        if (mx >= bx + btn_w + 8 && mx < bx + btn_w * 2 + 8 && cy >= y && cy < y + btn_h) {
+            s.show_shadows = false;
+            return;
+        }
+        y += btn_h + 20 + 16;
+
+        // Clock: 24h
+        if (mx >= bx && mx < bx + btn_w && cy >= y && cy < y + btn_h) {
+            s.clock_24h = true;
+            return;
+        }
+        // Clock: 12h
+        if (mx >= bx + btn_w + 8 && mx < bx + btn_w * 2 + 8 && cy >= y && cy < y + btn_h) {
+            s.clock_24h = false;
+            return;
+        }
+        y += btn_h + 20 + 16;
+
+        // UI Scale buttons
+        int sbw = 68;
+        // Small
+        if (mx >= bx && mx < bx + sbw && cy >= y && cy < y + btn_h) {
+            s.ui_scale = 0;
+            apply_ui_scale(0);
+            return;
+        }
+        // Default
+        if (mx >= bx + sbw + 8 && mx < bx + sbw * 2 + 8 && cy >= y && cy < y + btn_h) {
+            s.ui_scale = 1;
+            apply_ui_scale(1);
+            return;
+        }
+        // Large
+        if (mx >= bx + (sbw + 8) * 2 && mx < bx + sbw * 3 + 16 && cy >= y && cy < y + btn_h) {
+            s.ui_scale = 2;
+            apply_ui_scale(2);
+            return;
+        }
+    }
+}
+
+// ============================================================================
+// Cleanup
+// ============================================================================
+
+static void settings_on_close(Window* win) {
     if (win->app_data) {
         zenith::mfree(win->app_data);
         win->app_data = nullptr;
@@ -69,20 +487,23 @@ static void about_on_close(Window* win) {
 }
 
 // ============================================================================
-// About launcher
+// Settings launcher
 // ============================================================================
 
 void open_settings(DesktopState* ds) {
-    int idx = desktop_create_window(ds, "About", 280, 150, 380, 280);
+    int idx = desktop_create_window(ds, "Settings", 200, 100, 480, 420);
     if (idx < 0) return;
 
     Window* win = &ds->windows[idx];
-    AboutState* st = (AboutState*)zenith::malloc(sizeof(AboutState));
-    zenith::memset(st, 0, sizeof(AboutState));
+    SettingsState* st = (SettingsState*)zenith::malloc(sizeof(SettingsState));
+    zenith::memset(st, 0, sizeof(SettingsState));
+    st->desktop = ds;
+    st->active_tab = 0;
     zenith::get_info(&st->sys_info);
     st->uptime_ms = zenith::get_milliseconds();
 
     win->app_data = st;
-    win->on_draw = about_on_draw;
-    win->on_close = about_on_close;
+    win->on_draw = settings_on_draw;
+    win->on_mouse = settings_on_mouse;
+    win->on_close = settings_on_close;
 }
diff --git a/programs/src/desktop/app_sysinfo.cpp b/programs/src/desktop/app_sysinfo.cpp
index ed04fdb..07b52d0 100644
--- a/programs/src/desktop/app_sysinfo.cpp
+++ b/programs/src/desktop/app_sysinfo.cpp
@@ -31,7 +31,7 @@ static void sysinfo_on_draw(Window* win, Framebuffer& fb) {
 
     // Title
     c.text(x, y, "System Information", colors::ACCENT);
-    y += FONT_HEIGHT + 12;
+    y += system_font_height() + 12;
 
     // Separator
     c.hline(x, y, c.w - 2 * x, colors::BORDER);
@@ -52,7 +52,7 @@ static void sysinfo_on_draw(Window* win, Framebuffer& fb) {
     // Max Processes
     snprintf(line, sizeof(line), "Max PIDs: %d", (int)si->sys_info.maxProcesses);
     c.text(x, y, line, colors::TEXT_COLOR);
-    y += FONT_HEIGHT + 12;
+    y += system_font_height() + 12;
 
     // Uptime
     int up_sec = (int)(si->uptime_ms / 1000);
@@ -60,11 +60,11 @@ static void sysinfo_on_draw(Window* win, Framebuffer& fb) {
     int up_hr = up_min / 60;
     snprintf(line, sizeof(line), "Uptime:   %d:%02d:%02d", up_hr, up_min % 60, up_sec % 60);
     c.text(x, y, line, colors::TEXT_COLOR);
-    y += FONT_HEIGHT + 12;
+    y += system_font_height() + 12;
 
     // Network section
     c.text(x, y, "Network", colors::ACCENT);
-    y += FONT_HEIGHT + 8;
+    y += system_font_height() + 8;
 
     c.hline(x, y, c.w - 2 * x, colors::BORDER);
     y += 8;
diff --git a/programs/src/desktop/app_terminal.cpp b/programs/src/desktop/app_terminal.cpp
index 8fc8468..b4e7cb8 100644
--- a/programs/src/desktop/app_terminal.cpp
+++ b/programs/src/desktop/app_terminal.cpp
@@ -15,6 +15,14 @@ static void terminal_on_draw(Window* win, Framebuffer& fb) {
     if (!ts) return;
 
     Rect cr = win->content_rect();
+
+    // Check if window was resized and update terminal grid
+    int new_cols = cr.w / mono_cell_width();
+    int new_rows = cr.h / mono_cell_height();
+    if (new_cols != ts->cols || new_rows != ts->rows) {
+        terminal_resize(ts, new_cols, new_rows);
+    }
+
     terminal_render(ts, win->content, cr.w, cr.h);
 }
 
@@ -52,8 +60,8 @@ void open_terminal(DesktopState* ds) {
 
     Window* win = &ds->windows[idx];
     Rect cr = win->content_rect();
-    int cols = cr.w / FONT_WIDTH;
-    int rows = cr.h / FONT_HEIGHT;
+    int cols = cr.w / mono_cell_width();
+    int rows = cr.h / mono_cell_height();
 
     TerminalState* ts = (TerminalState*)zenith::malloc(sizeof(TerminalState));
     zenith::memset(ts, 0, sizeof(TerminalState));
diff --git a/programs/src/desktop/app_texteditor.cpp b/programs/src/desktop/app_texteditor.cpp
index 6014685..75b7406 100644
--- a/programs/src/desktop/app_texteditor.cpp
+++ b/programs/src/desktop/app_texteditor.cpp
@@ -11,6 +11,8 @@
 // Text Editor state
 // ============================================================================
 
+static constexpr int TE_TOOLBAR_H   = 36;
+static constexpr int TE_PATHBAR_H   = 32;
 static constexpr int TE_STATUS_H    = 24;
 static constexpr int TE_LINE_NUM_W  = 48;
 static constexpr int TE_INIT_CAP    = 4096;
@@ -33,6 +35,11 @@ struct TextEditorState {
     char filepath[256];
     char filename[64];
     DesktopState* desktop;
+
+    bool show_pathbar;
+    char pathbar_text[256];
+    int pathbar_cursor;
+    int pathbar_len;
 };
 
 // ============================================================================
@@ -203,7 +210,7 @@ static void te_move_end(TextEditorState* te) {
 // Scrolling
 // ============================================================================
 
-static void te_ensure_cursor_visible(TextEditorState* te, int visible_lines) {
+static void te_ensure_cursor_visible(TextEditorState* te, int visible_lines, int content_w) {
     if (te->cursor_line < te->scroll_y) {
         te->scroll_y = te->cursor_line;
     }
@@ -212,13 +219,14 @@ static void te_ensure_cursor_visible(TextEditorState* te, int visible_lines) {
     }
 
     // Horizontal scroll
-    int cursor_px = te->cursor_col * FONT_WIDTH;
-    int view_w = 580 - TE_LINE_NUM_W; // approximate
-    if (cursor_px - te->scroll_x > view_w - FONT_WIDTH * 2) {
-        te->scroll_x = cursor_px - view_w + FONT_WIDTH * 4;
+    int cell_w = mono_cell_width();
+    int cursor_px = te->cursor_col * cell_w;
+    int view_w = content_w - TE_LINE_NUM_W;
+    if (cursor_px - te->scroll_x > view_w - cell_w * 2) {
+        te->scroll_x = cursor_px - view_w + cell_w * 4;
     }
     if (cursor_px < te->scroll_x) {
-        te->scroll_x = cursor_px - FONT_WIDTH * 2;
+        te->scroll_x = cursor_px - cell_w * 2;
         if (te->scroll_x < 0) te->scroll_x = 0;
     }
 }
@@ -290,21 +298,96 @@ static void texteditor_on_draw(Window* win, Framebuffer& fb) {
     Canvas c(win);
     c.fill(colors::WINDOW_BG);
 
-    int text_area_h = c.h - TE_STATUS_H;
-    int visible_lines = text_area_h / FONT_HEIGHT;
+    int cell_w = mono_cell_width();
+    int cell_h = mono_cell_height();
 
-    te_ensure_cursor_visible(te, visible_lines);
+    // ---- Toolbar (36px) ----
+    c.fill_rect(0, 0, c.w, TE_TOOLBAR_H, Color::from_rgb(0xF5, 0xF5, 0xF5));
+
+    // Open button
+    Color btn_bg = Color::from_rgb(0xE8, 0xE8, 0xE8);
+    c.fill_rounded_rect(4, 6, 24, 24, 3, btn_bg);
+    if (te->desktop && te->desktop->icon_folder.pixels)
+        c.icon(8, 10, te->desktop->icon_folder);
+
+    // Save button
+    c.fill_rounded_rect(32, 6, 24, 24, 3, btn_bg);
+    if (te->desktop && te->desktop->icon_save.pixels)
+        c.icon(36, 10, te->desktop->icon_save);
+
+    // Vertical separator
+    c.vline(60, 4, 28, colors::BORDER);
+
+    // Filename + modified flag
+    char toolbar_label[128];
+    if (te->filename[0]) {
+        snprintf(toolbar_label, 128, "%s%s", te->filename, te->modified ? " [modified]" : "");
+    } else {
+        snprintf(toolbar_label, 128, "Untitled%s", te->modified ? " [modified]" : "");
+    }
+    int sfh = system_font_height();
+    c.text(68, (TE_TOOLBAR_H - sfh) / 2, toolbar_label, colors::TEXT_COLOR);
+
+    // Toolbar bottom separator
+    c.hline(0, TE_TOOLBAR_H - 1, c.w, colors::BORDER);
+
+    // ---- Path bar (conditional, 32px) ----
+    int editor_y_start = TE_TOOLBAR_H;
+
+    if (te->show_pathbar) {
+        int pb_y = TE_TOOLBAR_H;
+        c.fill_rect(0, pb_y, c.w, TE_PATHBAR_H, Color::from_rgb(0xF0, 0xF0, 0xF0));
+
+        // Text input box
+        int inp_x = 8;
+        int inp_y = pb_y + 4;
+        int btn_w = 56;
+        int inp_w = c.w - inp_x - btn_w - 12;
+        int inp_h = 24;
+
+        c.fill_rect(inp_x, inp_y, inp_w, inp_h, colors::WHITE);
+        c.rect(inp_x, inp_y, inp_w, inp_h, colors::ACCENT);
+
+        // Path text
+        int text_y = inp_y + (inp_h - sfh) / 2;
+        c.text(inp_x + 4, text_y, te->pathbar_text, colors::TEXT_COLOR);
+
+        // Blinking cursor in path input
+        char prefix[256];
+        int plen = te->pathbar_cursor;
+        if (plen > 255) plen = 255;
+        for (int i = 0; i < plen; i++) prefix[i] = te->pathbar_text[i];
+        prefix[plen] = '\0';
+        int cx = inp_x + 4 + text_width(prefix);
+        c.fill_rect(cx, inp_y + 3, 2, inp_h - 6, colors::ACCENT);
+
+        // Open button
+        int ob_x = inp_x + inp_w + 6;
+        c.button(ob_x, inp_y, btn_w, inp_h, "Open", colors::ACCENT, colors::WHITE, 3);
+
+        // Path bar bottom separator
+        c.hline(0, pb_y + TE_PATHBAR_H - 1, c.w, colors::BORDER);
+
+        editor_y_start = TE_TOOLBAR_H + TE_PATHBAR_H;
+    }
+
+    // ---- Editor area ----
+    int text_area_h = c.h - editor_y_start - TE_STATUS_H;
+    int visible_lines = text_area_h / cell_h;
+    if (visible_lines < 1) visible_lines = 1;
+
+    te_ensure_cursor_visible(te, visible_lines, c.w);
 
     // Line number gutter background
-    c.fill_rect(0, 0, TE_LINE_NUM_W, text_area_h, Color::from_rgb(0xF0, 0xF0, 0xF0));
+    c.fill_rect(0, editor_y_start, TE_LINE_NUM_W, text_area_h, Color::from_rgb(0xF0, 0xF0, 0xF0));
 
     // Gutter separator
-    c.vline(TE_LINE_NUM_W, 0, text_area_h, colors::BORDER);
+    c.vline(TE_LINE_NUM_W, editor_y_start, text_area_h, colors::BORDER);
 
     // Draw lines
     Color linenum_color = Color::from_rgb(0x99, 0x99, 0x99);
     Color cursor_line_color = Color::from_rgb(0xFF, 0xFD, 0xE8);
-    uint32_t text_px = colors::TEXT_COLOR.to_pixel();
+    Color text_color = colors::TEXT_COLOR;
 
     int text_start_x = TE_LINE_NUM_W + 4;
 
@@ -312,12 +395,12 @@ static void texteditor_on_draw(Window* win, Framebuffer& fb) {
         int line = te->scroll_y + vis;
         if (line >= te->line_count) break;
 
-        int py = vis * FONT_HEIGHT;
-        if (py >= text_area_h) break;
+        int py = editor_y_start + vis * cell_h;
+        if (py >= editor_y_start + text_area_h) break;
 
         // Cursor line highlighting
         if (line == te->cursor_line) {
-            int hl_h = gui_min(FONT_HEIGHT, text_area_h - py);
+            int hl_h = gui_min(cell_h, editor_y_start + text_area_h - py);
             if (hl_h > 0)
                 c.fill_rect(TE_LINE_NUM_W + 1, py, c.w - TE_LINE_NUM_W - 1, hl_h, cursor_line_color);
         }
@@ -325,28 +408,37 @@ static void texteditor_on_draw(Window* win, Framebuffer& fb) {
         // Line number
         char num_str[8];
         snprintf(num_str, 8, "%4d", line + 1);
-        c.text(4, py, num_str, linenum_color);
+        c.text_mono(4, py, num_str, linenum_color);
 
         // Line text (per-character rendering with horizontal scroll clipping)
         int line_start = te->line_offsets[line];
         int line_len = te_line_length(te, line);
 
         for (int ci = 0; ci < line_len; ci++) {
-            int px = text_start_x + ci * FONT_WIDTH - te->scroll_x;
-            if (px + FONT_WIDTH <= TE_LINE_NUM_W + 1) continue;
+            int px = text_start_x + ci * cell_w - te->scroll_x;
+            if (px + cell_w <= TE_LINE_NUM_W + 1) continue;
             if (px >= c.w) break;
 
             char ch = te->buffer[line_start + ci];
             if (ch >= 32 || ch < 0) {
-                const uint8_t* glyph = &font_data[(unsigned char)ch * FONT_HEIGHT];
-                for (int fy = 0; fy < FONT_HEIGHT && py + fy < text_area_h; fy++) {
-                    uint8_t bits = glyph[fy];
-                    for (int fx = 0; fx < FONT_WIDTH; fx++) {
-                        if (bits & (0x80 >> fx)) {
-                            int dx = px + fx;
-                            int dy = py + fy;
-                            if (dx > TE_LINE_NUM_W && dx < c.w && dy >= 0 && dy < text_area_h)
-                                c.pixels[dy * c.w + dx] = text_px;
+                if (fonts::mono && fonts::mono->valid) {
+                    GlyphCache* gc = fonts::mono->get_cache(fonts::TERM_SIZE);
+                    fonts::mono->draw_char_to_buffer(
+                        c.pixels, c.w, c.h, px, py + gc->ascent,
+                        ch, text_color, gc);
+                } else {
+                    // bitmap fallback
+                    uint32_t text_px = text_color.to_pixel();
+                    const uint8_t* glyph = &font_data[(unsigned char)ch * FONT_HEIGHT];
+                    for (int fy = 0; fy < FONT_HEIGHT && py + fy < editor_y_start + text_area_h; fy++) {
+                        uint8_t bits = glyph[fy];
+                        for (int fx = 0; fx < FONT_WIDTH; fx++) {
+                            if (bits & (0x80 >> fx)) {
+                                int dx = px + fx;
+                                int dy = py + fy;
+                                if (dx > TE_LINE_NUM_W && dx < c.w && dy >= 0 && dy < c.h)
+                                    c.pixels[dy * c.w + dx] = text_px;
+                            }
                         }
                     }
                 }
@@ -355,9 +447,9 @@ static void texteditor_on_draw(Window* win, Framebuffer& fb) {
 
         // Draw cursor
         if (line == te->cursor_line) {
-            int cx = text_start_x + te->cursor_col * FONT_WIDTH - te->scroll_x;
+            int cx = text_start_x + te->cursor_col * cell_w - te->scroll_x;
             if (cx > TE_LINE_NUM_W && cx + 2 <= c.w) {
-                int cur_h = gui_min(FONT_HEIGHT, text_area_h - py);
+                int cur_h = gui_min(cell_h, editor_y_start + text_area_h - py);
                 if (cur_h > 0)
                     c.fill_rect(cx, py, 2, cur_h, colors::ACCENT);
             }
@@ -368,20 +460,21 @@ static void texteditor_on_draw(Window* win, Framebuffer& fb) {
     int status_y = c.h - TE_STATUS_H;
     c.fill_rect(0, status_y, c.w, TE_STATUS_H, Color::from_rgb(0x2B, 0x3E, 0x50));
 
-    // Filename + modified flag
+    // Cursor position (right side)
+    char status_right[32];
+    snprintf(status_right, 32, "Ln %d, Col %d ", te->cursor_line + 1, te->cursor_col + 1);
+    int sr_w = text_width(status_right);
+    int status_text_y = status_y + (TE_STATUS_H - sfh) / 2;
+    c.text(c.w - sr_w - 4, status_text_y, status_right, colors::PANEL_TEXT);
+
+    // Filename + modified flag (left side)
     char status_left[128];
     if (te->filename[0]) {
         snprintf(status_left, 128, " %s%s", te->filename, te->modified ? " [modified]" : "");
     } else {
         snprintf(status_left, 128, " Untitled%s", te->modified ? " [modified]" : "");
     }
-    c.text(4, status_y + (TE_STATUS_H - FONT_HEIGHT) / 2, status_left, colors::PANEL_TEXT);
-
-    // Cursor position (right side)
-    char status_right[32];
-    snprintf(status_right, 32, "Ln %d, Col %d ", te->cursor_line + 1, te->cursor_col + 1);
-    int sr_w = zenith::slen(status_right) * FONT_WIDTH;
-    c.text(c.w - sr_w - 4, status_y + (TE_STATUS_H - FONT_HEIGHT) / 2, status_right, colors::PANEL_TEXT);
+    c.text(4, status_text_y, status_left, colors::PANEL_TEXT);
 }
 
 // ============================================================================
@@ -395,15 +488,62 @@ static void texteditor_on_mouse(Window* win, MouseEvent& ev) {
     Rect cr = win->content_rect();
     int local_x = ev.x - cr.x;
     int local_y = ev.y - cr.y;
-    int text_area_h = cr.h - TE_STATUS_H;
 
-    if (ev.left_pressed() && local_y < text_area_h && local_x > TE_LINE_NUM_W) {
-        // Click to position cursor
-        int clicked_line = te->scroll_y + local_y / FONT_HEIGHT;
+    int cell_w = mono_cell_width();
+    int cell_h = mono_cell_height();
+
+    int editor_y_start = TE_TOOLBAR_H + (te->show_pathbar ? TE_PATHBAR_H : 0);
+    int text_area_h = cr.h - editor_y_start - TE_STATUS_H;
+
+    // ---- Toolbar clicks ----
+    if (ev.left_pressed() && local_y < TE_TOOLBAR_H) {
+        // Open button
+        if (local_x >= 4 && local_x < 28 && local_y >= 6 && local_y < 30) {
+            te->show_pathbar = !te->show_pathbar;
+            if (te->show_pathbar) {
+                // Pre-fill with current filepath
+                zenith::strncpy(te->pathbar_text, te->filepath, 255);
+                te->pathbar_len = zenith::slen(te->pathbar_text);
+                te->pathbar_cursor = te->pathbar_len;
+            }
+            return;
+        }
+        // Save button
+        if (local_x >= 32 && local_x < 56 && local_y >= 6 && local_y < 30) {
+            te_save_file(te);
+            return;
+        }
+        return;
+    }
+
+    // ---- Path bar clicks ----
+    if (te->show_pathbar && local_y >= TE_TOOLBAR_H && local_y < TE_TOOLBAR_H + TE_PATHBAR_H) {
+        if (ev.left_pressed()) {
+            // Check "Open" button region
+            int btn_w = 56;
+            int inp_w = cr.w - 8 - btn_w - 12;
+            int ob_x = 8 + inp_w + 6;
+            if (local_x >= ob_x && local_x < ob_x + btn_w) {
+                if (te->pathbar_text[0]) {
+                    te_load_file(te, te->pathbar_text);
+                    // Update window title
+                    char title[64];
+                    snprintf(title, 64, "%s - Editor", te->filename);
+                    zenith::strncpy(win->title, title, 63);
+                    te->show_pathbar = false;
+                }
+            }
+        }
+        return;
+    }
+
+    // ---- Editor area clicks ----
+    if (ev.left_pressed() && local_y >= editor_y_start && local_y < editor_y_start + text_area_h && local_x > TE_LINE_NUM_W) {
+        int clicked_line = te->scroll_y + (local_y - editor_y_start) / cell_h;
         if (clicked_line >= te->line_count) clicked_line = te->line_count - 1;
         if (clicked_line < 0) clicked_line = 0;
 
-        int clicked_col = (local_x - TE_LINE_NUM_W - 4 + te->scroll_x + FONT_WIDTH / 2) / FONT_WIDTH;
+        int clicked_col = (local_x - TE_LINE_NUM_W - 4 + te->scroll_x + cell_w / 2) / cell_w;
         if (clicked_col < 0) clicked_col = 0;
         int line_len = te_line_length(te, clicked_line);
         if (clicked_col > line_len) clicked_col = line_len;
@@ -412,11 +552,11 @@ static void texteditor_on_mouse(Window* win, MouseEvent& ev) {
         te_update_cursor_pos(te);
     }
 
-    // Scroll
-    if (ev.scroll != 0 && local_y < text_area_h) {
+    // ---- Scroll ----
+    if (ev.scroll != 0 && local_y >= editor_y_start && local_y < editor_y_start + text_area_h) {
         te->scroll_y -= ev.scroll * 3;
         if (te->scroll_y < 0) te->scroll_y = 0;
-        int max_scroll = te->line_count - (text_area_h / FONT_HEIGHT) + 1;
+        int max_scroll = te->line_count - (text_area_h / cell_h) + 1;
         if (max_scroll < 0) max_scroll = 0;
         if (te->scroll_y > max_scroll) te->scroll_y = max_scroll;
     }
@@ -430,12 +570,71 @@ static void texteditor_on_key(Window* win, const Zenith::KeyEvent& key) {
     TextEditorState* te = (TextEditorState*)win->app_data;
     if (!te || !key.pressed) return;
 
+    // ---- Path bar input mode ----
+    if (te->show_pathbar) {
+        if (key.ascii == '\n' || key.ascii == '\r') {
+            if (te->pathbar_text[0]) {
+                te_load_file(te, te->pathbar_text);
+                char title[64];
+                snprintf(title, 64, "%s - Editor", te->filename);
+                zenith::strncpy(win->title, title, 63);
+                te->show_pathbar = false;
+            }
+            return;
+        }
+        if (key.scancode == 0x01) { // Escape
+            te->show_pathbar = false;
+            return;
+        }
+        if (key.ascii == '\b' || key.scancode == 0x0E) {
+            if (te->pathbar_cursor > 0) {
+                for (int i = te->pathbar_cursor - 1; i < te->pathbar_len - 1; i++)
+                    te->pathbar_text[i] = te->pathbar_text[i + 1];
+                te->pathbar_len--;
+                te->pathbar_cursor--;
+                te->pathbar_text[te->pathbar_len] = '\0';
+            }
+            return;
+        }
+        if (key.scancode == 0x4B) { // Left
+            if (te->pathbar_cursor > 0) te->pathbar_cursor--;
+            return;
+        }
+        if (key.scancode == 0x4D) { // Right
+            if (te->pathbar_cursor < te->pathbar_len) te->pathbar_cursor++;
+            return;
+        }
+        if (key.ascii >= 32 && key.ascii < 127 && te->pathbar_len < 254) {
+            for (int i = te->pathbar_len; i > te->pathbar_cursor; i--)
+                te->pathbar_text[i] = te->pathbar_text[i - 1];
+            te->pathbar_text[te->pathbar_cursor] = key.ascii;
+            te->pathbar_cursor++;
+            te->pathbar_len++;
+            te->pathbar_text[te->pathbar_len] = '\0';
+            return;
+        }
+        return;
+    }
+
+    // ---- Normal editor mode ----
+
     // Ctrl+S: save
     if (key.ctrl && (key.ascii == 's' || key.ascii == 'S')) {
         te_save_file(te);
         return;
     }
 
+    // Ctrl+O: open
+    if (key.ctrl && (key.ascii == 'o' || key.ascii == 'O')) {
+        te->show_pathbar = !te->show_pathbar;
+        if (te->show_pathbar) {
+            zenith::strncpy(te->pathbar_text, te->filepath, 255);
+            te->pathbar_len = zenith::slen(te->pathbar_text);
+            te->pathbar_cursor = te->pathbar_len;
+        }
+        return;
+    }
+
     // Arrow keys
     if (key.scancode == 0x48) { te_move_up(te); return; }
     if (key.scancode == 0x50) { te_move_down(te); return; }
@@ -503,6 +702,10 @@ void open_texteditor(DesktopState* ds) {
     te->buf_len = 0;
     te->modified = false;
     te->desktop = ds;
+    te->show_pathbar = false;
+    te->pathbar_text[0] = '\0';
+    te->pathbar_cursor = 0;
+    te->pathbar_len = 0;
 
     te_recompute_lines(te);
     te_update_cursor_pos(te);
@@ -536,6 +739,10 @@ void open_texteditor_with_file(DesktopState* ds, const char* path) {
     te->buf_len = 0;
     te->modified = false;
     te->desktop = ds;
+    te->show_pathbar = false;
+    te->pathbar_text[0] = '\0';
+    te->pathbar_cursor = 0;
+    te->pathbar_len = 0;
 
     // Initialize line index for empty document first (ensures line_offsets
     // is non-null even if te_load_file fails to open the file)
diff --git a/programs/src/desktop/app_wiki.cpp b/programs/src/desktop/app_wiki.cpp
index 4489875..2a568bc 100644
--- a/programs/src/desktop/app_wiki.cpp
+++ b/programs/src/desktop/app_wiki.cpp
@@ -168,7 +168,8 @@ static void wiki_build_display(WikiState* ws, const char* title,
     ws->lineCount = 0;
     ws->scrollY = 0;
 
-    int maxChars = (contentW - 24 - WIKI_SCROLLBAR_W) / FONT_WIDTH;
+    int char_w = mono_cell_width();
+    int maxChars = (contentW - 24 - WIKI_SCROLLBAR_W) / char_w;
     if (maxChars < 20) maxChars = 20;
 
     Color accent_c = colors::ACCENT;
@@ -301,7 +302,7 @@ static void wiki_on_draw(Window* win, Framebuffer& fb) {
     c.rect(tb_x, tb_y, tb_w, tb_h, colors::BORDER);
 
     // Search text
-    c.text(tb_x + 4, tb_y + (tb_h - FONT_HEIGHT) / 2, ws->searchQuery, colors::TEXT_COLOR);
+    c.text(tb_x + 4, tb_y + (tb_h - system_font_height()) / 2, ws->searchQuery, colors::TEXT_COLOR);
 
     // ---- Search button ----
     int btn_x = tb_x + tb_w + 6;
@@ -313,7 +314,8 @@ static void wiki_on_draw(Window* win, Framebuffer& fb) {
     // ---- Content area ----
     int content_y = WIKI_TOOLBAR_H + 1;
     int content_h = c.h - content_y;
-    int visibleLines = content_h / (FONT_HEIGHT + 4);
+    int wiki_sfh = system_font_height();
+    int visibleLines = content_h / (wiki_sfh + 4);
     if (visibleLines < 1) visibleLines = 1;
 
     if (ws->mode == WikiState::FETCHING) {
@@ -326,8 +328,8 @@ static void wiki_on_draw(Window* win, Framebuffer& fb) {
             Color::from_rgb(0x88, 0x88, 0x88));
     } else if (ws->mode == WikiState::DONE && ws->lineCount > 0) {
         int y = content_y + 8;
-        int lineH = FONT_HEIGHT + 4;
-        for (int i = ws->scrollY; i < ws->lineCount && y + FONT_HEIGHT < c.h; i++) {
+        int lineH = wiki_sfh + 4;
+        for (int i = ws->scrollY; i < ws->lineCount && y + wiki_sfh < c.h; i++) {
             WikiDisplayLine* dl = &ws->lines[i];
             if (dl->text[0] != '\0') {
                 c.text(12, y, dl->text, dl->color);
@@ -412,7 +414,7 @@ static void wiki_on_mouse(Window* win, MouseEvent& ev) {
     if (ev.scroll != 0 && ws->mode == WikiState::DONE && ws->lineCount > 0) {
         int ch = cr.h;
         int content_h = ch - WIKI_TOOLBAR_H - 1;
-        int visibleLines = content_h / (FONT_HEIGHT + 4);
+        int visibleLines = content_h / (system_font_height() + 4);
         int maxScroll = ws->lineCount - visibleLines;
         if (maxScroll < 0) maxScroll = 0;
 
@@ -443,7 +445,7 @@ static void wiki_on_key(Window* win, const Zenith::KeyEvent& key) {
             }
         }
         int content_h = cr.h - WIKI_TOOLBAR_H - 1;
-        int visibleLines = content_h / (FONT_HEIGHT + 4);
+        int visibleLines = content_h / (system_font_height() + 4);
         if (visibleLines < 1) visibleLines = 1;
         int maxScroll = ws->lineCount - visibleLines;
         if (maxScroll < 0) maxScroll = 0;
diff --git a/programs/src/desktop/apps_common.hpp b/programs/src/desktop/apps_common.hpp
index 94147ed..4b7cc77 100644
--- a/programs/src/desktop/apps_common.hpp
+++ b/programs/src/desktop/apps_common.hpp
@@ -167,5 +167,10 @@ void open_texteditor(DesktopState* ds);
 void open_texteditor_with_file(DesktopState* ds, const char* path);
 void open_klog(DesktopState* ds);
 void open_wiki(DesktopState* ds);
+void open_procmgr(DesktopState* ds);
+void open_mandelbrot(DesktopState* ds);
+void open_devexplorer(DesktopState* ds);
 void open_settings(DesktopState* ds);
+void open_doom(DesktopState* ds);
 void open_reboot_dialog(DesktopState* ds);
+void desktop_poll_external_windows(DesktopState* ds);
diff --git a/programs/src/desktop/main.cpp b/programs/src/desktop/main.cpp
index 4cb4b65..6816be1 100644
--- a/programs/src/desktop/main.cpp
+++ b/programs/src/desktop/main.cpp
@@ -23,6 +23,9 @@ void gui::desktop_init(DesktopState* ds) {
     ds->fb.clear(colors::DESKTOP_BG);
     ds->fb.flip();
 
+    // Load TrueType fonts
+    fonts::init();
+
     ds->window_count = 0;
     ds->focused_window = -1;
     ds->prev_buttons = 0;
@@ -58,6 +61,22 @@ void gui::desktop_init(DesktopState* ds) {
     ds->icon_settings = svg_load("0:/icons/help-about.svg",     20, 20, defColor);
     ds->icon_reboot   = svg_load("0:/icons/system-reboot.svg", 20, 20, defColor);
 
+    ds->icon_doom     = svg_load("0:/icons/doom.svg", 20, 20, defColor);
+    ds->icon_procmgr  = svg_load("0:/icons/system-monitor.svg", 20, 20, defColor);
+    ds->icon_mandelbrot = svg_load("0:/icons/applications-science.svg", 20, 20, defColor);
+    ds->icon_devexplorer = svg_load("0:/icons/hardware.svg", 20, 20, defColor);
+
+    // Settings defaults
+    ds->settings.bg_gradient = true;
+    ds->settings.bg_grad_top = Color::from_rgb(0xD0, 0xD8, 0xE8);
+    ds->settings.bg_grad_bottom = Color::from_rgb(0xA0, 0xA8, 0xB8);
+    ds->settings.bg_solid = Color::from_rgb(0xD0, 0xD8, 0xE8);
+    ds->settings.panel_color = colors::PANEL_BG;
+    ds->settings.accent_color = colors::ACCENT;
+    ds->settings.show_shadows = true;
+    ds->settings.clock_24h = true;
+    ds->settings.ui_scale = 1;
+
     ds->ctx_menu_open = false;
     ds->ctx_menu_x = 0;
     ds->ctx_menu_y = 0;
@@ -100,6 +119,8 @@ int gui::desktop_create_window(DesktopState* ds, const char* title, int x, int y
     win->on_close = nullptr;
     win->on_poll = nullptr;
     win->app_data = nullptr;
+    win->external = false;
+    win->ext_win_id = -1;
 
     // Unfocus previous window
     if (ds->focused_window >= 0 && ds->focused_window < ds->window_count) {
@@ -115,10 +136,19 @@ void gui::desktop_close_window(DesktopState* ds, int idx) {
     if (idx < 0 || idx >= ds->window_count) return;
 
     Window* win = &ds->windows[idx];
+
+    // For external windows, send a close event instead of freeing the buffer
+    if (win->external) {
+        Zenith::WinEvent ev;
+        zenith::memset(&ev, 0, sizeof(ev));
+        ev.type = 3; // close
+        zenith::win_sendevent(win->ext_win_id, &ev);
+    }
+
     if (win->on_close) win->on_close(win);
 
-    // Free content buffer
-    if (win->content) {
+    // Free content buffer (skip for external windows — shared memory)
+    if (win->content && !win->external) {
         zenith::free(win->content);
         win->content = nullptr;
     }
@@ -180,7 +210,8 @@ void gui::desktop_draw_window(DesktopState* ds, int idx) {
     int h = win->frame.h;
 
     // Draw shadow
-    draw_shadow(fb, x, y, w, h, SHADOW_SIZE, colors::SHADOW);
+    if (ds->settings.show_shadows)
+        draw_shadow(fb, x, y, w, h, SHADOW_SIZE, colors::SHADOW);
 
     // Draw window body
     fb.fill_rect(x, y, w, h, colors::WINDOW_BG);
@@ -205,7 +236,7 @@ void gui::desktop_draw_window(DesktopState* ds, int idx) {
 
     // Draw title text centered in titlebar (after buttons)
     int title_x = x + 12 + 44 + BTN_RADIUS * 2 + 12; // after buttons
-    int title_y = y + (TITLEBAR_HEIGHT - FONT_HEIGHT) / 2;
+    int title_y = y + (TITLEBAR_HEIGHT - system_font_height()) / 2;
     int title_w = text_width(win->title);
     // Center in remaining space
     int remaining_w = w - (title_x - x) - 12;
@@ -222,9 +253,31 @@ void gui::desktop_draw_window(DesktopState* ds, int idx) {
     // Blit content buffer to framebuffer (clip to actual buffer size during resize)
     Rect cr = win->content_rect();
     if (win->content) {
-        int blit_w = cr.w < win->content_w ? cr.w : win->content_w;
-        int blit_h = cr.h < win->content_h ? cr.h : win->content_h;
-        fb.blit(cr.x, cr.y, blit_w, blit_h, win->content);
+        if (win->external && (cr.w != win->content_w || cr.h != win->content_h)) {
+            // Nearest-neighbor scale for external windows (fixed-size shared buffer)
+            int src_w = win->content_w;
+            int src_h = win->content_h;
+            int dst_w = cr.w;
+            int dst_h = cr.h;
+            uint32_t* buf = fb.buffer();
+            int pitch = fb.pitch();
+            for (int y = 0; y < dst_h; y++) {
+                int dy = cr.y + y;
+                if (dy < 0 || dy >= fb.height()) continue;
+                int sy = y * src_h / dst_h;
+                uint32_t* dst_row = (uint32_t*)((uint8_t*)buf + dy * pitch);
+                uint32_t* src_row = win->content + sy * src_w;
+                for (int x = 0; x < dst_w; x++) {
+                    int dx = cr.x + x;
+                    if (dx < 0 || dx >= fb.width()) continue;
+                    dst_row[dx] = src_row[x * src_w / dst_w];
+                }
+            }
+        } else {
+            int blit_w = cr.w < win->content_w ? cr.w : win->content_w;
+            int blit_h = cr.h < win->content_h ? cr.h : win->content_h;
+            fb.blit(cr.x, cr.y, blit_w, blit_h, win->content);
+        }
     }
 }
 
@@ -233,11 +286,12 @@ void gui::desktop_draw_panel(DesktopState* ds) {
     int sw = ds->screen_w;
 
     // Panel gradient background (slightly lighter at top)
+    Color pc = ds->settings.panel_color;
     for (int y = 0; y < PANEL_HEIGHT; y++) {
         int t = y * 255 / PANEL_HEIGHT;
-        uint8_t r = colors::PANEL_BG.r + (10 - t * 10 / 255);
-        uint8_t g = colors::PANEL_BG.g + (10 - t * 10 / 255);
-        uint8_t b = colors::PANEL_BG.b + (10 - t * 10 / 255);
+        uint8_t r = pc.r + (10 - t * 10 / 255);
+        uint8_t g = pc.g + (10 - t * 10 / 255);
+        uint8_t b = pc.b + (10 - t * 10 / 255);
         fb.fill_rect(0, y, sw, 1, Color::from_rgb(r, g, b));
     }
 
@@ -284,7 +338,7 @@ void gui::desktop_draw_panel(DesktopState* ds) {
 
         // Active window accent underline bar
         if (i == ds->focused_window) {
-            fb.fill_rect(indicator_x + 4, 26, iw - 8, 2, colors::ACCENT);
+            fb.fill_rect(indicator_x + 4, 26, iw - 8, 2, ds->settings.accent_color);
         }
 
         // Truncate title if too long
@@ -292,7 +346,7 @@ void gui::desktop_draw_panel(DesktopState* ds) {
         zenith::strncpy(short_title, win->title, 18);
 
         int tx = indicator_x + pad;
-        int ty = 4 + (24 - FONT_HEIGHT) / 2;
+        int ty = 4 + (24 - system_font_height()) / 2;
         draw_text(fb, tx, ty, short_title, colors::PANEL_TEXT);
 
         indicator_x += iw + 4;
@@ -302,11 +356,18 @@ void gui::desktop_draw_panel(DesktopState* ds) {
     Zenith::DateTime dt;
     zenith::gettime(&dt);
 
-    char clock_str[8];
-    snprintf(clock_str, sizeof(clock_str), "%02d:%02d", (int)dt.Hour, (int)dt.Minute);
+    char clock_str[12];
+    if (ds->settings.clock_24h) {
+        snprintf(clock_str, sizeof(clock_str), "%02d:%02d", (int)dt.Hour, (int)dt.Minute);
+    } else {
+        int h12 = (int)dt.Hour % 12;
+        if (h12 == 0) h12 = 12;
+        const char* ampm = dt.Hour < 12 ? "AM" : "PM";
+        snprintf(clock_str, sizeof(clock_str), "%d:%02d %s", h12, (int)dt.Minute, ampm);
+    }
     int clock_w = text_width(clock_str);
     int clock_x = sw - clock_w - 12;
-    int clock_y = (PANEL_HEIGHT - FONT_HEIGHT) / 2;
+    int clock_y = (PANEL_HEIGHT - system_font_height()) / 2;
     draw_text(fb, clock_x, clock_y, clock_str, colors::PANEL_TEXT);
 
     // Date before clock
@@ -314,7 +375,7 @@ void gui::desktop_draw_panel(DesktopState* ds) {
     int month_idx = dt.Month > 0 && dt.Month <= 12 ? dt.Month - 1 : 0;
     snprintf(date_str, sizeof(date_str), "%s %d", month_names[month_idx], (int)dt.Day);
     int date_w = text_width(date_str);
-    int date_x = clock_x - date_w - 16;
+    int date_x = clock_x - date_w - 10;
     draw_text(fb, date_x, clock_y, date_str, colors::PANEL_TEXT);
 
     // Network icon (to the left of the date)
@@ -349,7 +410,7 @@ void gui::desktop_draw_panel(DesktopState* ds) {
 // App Menu (5 items with separator and rounded corners)
 // ============================================================================
 
-static constexpr int MENU_ITEM_COUNT = 9;
+static constexpr int MENU_ITEM_COUNT = 13;
 static constexpr int MENU_W = 220;
 static constexpr int MENU_ITEM_H = 40;
 
@@ -379,8 +440,12 @@ static void desktop_draw_app_menu(DesktopState* ds) {
         { "Calculator",   &ds->icon_calculator },
         { "Text Editor",  &ds->icon_texteditor },
         { "Kernel Log",   &ds->icon_terminal },
+        { "Processes",    &ds->icon_procmgr },
+        { "Mandelbrot",   &ds->icon_mandelbrot },
+        { "Devices",      &ds->icon_devexplorer },
         { "Wikipedia",    &ds->icon_wikipedia },
-        { "About",        &ds->icon_settings },
+        { "DOOM",         &ds->icon_doom },
+        { "Settings",     &ds->icon_settings },
         { "Reboot",       &ds->icon_reboot },
     };
 
@@ -391,7 +456,7 @@ static void desktop_draw_app_menu(DesktopState* ds) {
         int iy = menu_y + 4 + i * MENU_ITEM_H;
 
         // Thin separator lines before utility apps and before Settings
-        if (i == 3 || i == 7) {
+        if (i == 3 || i == 11) {
             int sep_y = iy - 1;
             for (int sx = menu_x + 8; sx < menu_x + MENU_W - 8; sx++)
                 fb.put_pixel(sx, sep_y, colors::BORDER);
@@ -414,7 +479,7 @@ static void desktop_draw_app_menu(DesktopState* ds) {
 
         // Label
         int tx = icon_x + 28;
-        int ty = item_rect.y + (MENU_ITEM_H - FONT_HEIGHT) / 2;
+        int ty = item_rect.y + (MENU_ITEM_H - system_font_height()) / 2;
         draw_text(fb, tx, ty, items[i].label, colors::TEXT_COLOR);
     }
 }
@@ -434,7 +499,7 @@ static void desktop_draw_net_popup(DesktopState* ds) {
 
     int tx = popup_x + 12;
     int ty = popup_y + 10;
-    int line_h = FONT_HEIGHT + 6;
+    int line_h = system_font_height() + 6;
     char line[64];
 
     Zenith::NetCfg& nc = ds->cached_net_cfg;
@@ -645,14 +710,19 @@ void gui::desktop_compose(DesktopState* ds) {
         uint32_t* row = (uint32_t*)((uint8_t*)buf + y * pitch);
         if (y < grad_start) {
             // Panel area - will be overwritten by panel drawing
-            uint32_t px = colors::PANEL_BG.to_pixel();
+            uint32_t px = ds->settings.panel_color.to_pixel();
+            for (int x = 0; x < sw; x++) row[x] = px;
+        } else if (ds->settings.bg_gradient) {
+            int t = y - grad_start;
+            Color top = ds->settings.bg_grad_top;
+            Color bot = ds->settings.bg_grad_bottom;
+            uint8_t r = top.r - (top.r - bot.r) * t / grad_range;
+            uint8_t g = top.g - (top.g - bot.g) * t / grad_range;
+            uint8_t b = top.b - (top.b - bot.b) * t / grad_range;
+            uint32_t px = 0xFF000000 | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
             for (int x = 0; x < sw; x++) row[x] = px;
         } else {
-            int t = y - grad_start;
-            uint8_t r = 0xD0 - (0xD0 - 0xA0) * t / grad_range;
-            uint8_t g = 0xD8 - (0xD8 - 0xA8) * t / grad_range;
-            uint8_t b = 0xE8 - (0xE8 - 0xB8) * t / grad_range;
-            uint32_t px = 0xFF000000 | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
+            uint32_t px = ds->settings.bg_solid.to_pixel();
             for (int x = 0; x < sw; x++) row[x] = px;
         }
     }
@@ -720,7 +790,7 @@ void gui::desktop_compose(DesktopState* ds) {
             }
 
             int tx = icon_x + 28;
-            int ty = item_r.y + (CTX_ITEM_H - FONT_HEIGHT) / 2;
+            int ty = item_r.y + (CTX_ITEM_H - system_font_height()) / 2;
             draw_text(fb, tx, ty, ctx_items[i].label, colors::TEXT_COLOR);
         }
     }
@@ -836,25 +906,29 @@ void gui::desktop_handle_mouse(DesktopState* ds) {
                     win->saved_frame = win->frame;
                     win->frame = {0, PANEL_HEIGHT, ds->screen_w / 2, ds->screen_h - PANEL_HEIGHT};
                     win->state = WIN_MAXIMIZED;
-                    Rect cr = win->content_rect();
-                    if (cr.w != win->content_w || cr.h != win->content_h) {
-                        if (win->content) zenith::free(win->content);
-                        win->content_w = cr.w;
-                        win->content_h = cr.h;
-                        win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
-                        zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                    if (!win->external) {
+                        Rect cr = win->content_rect();
+                        if (cr.w != win->content_w || cr.h != win->content_h) {
+                            if (win->content) zenith::free(win->content);
+                            win->content_w = cr.w;
+                            win->content_h = cr.h;
+                            win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
+                            zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                        }
                     }
                 } else if (mx >= ds->screen_w - 1) {
                     win->saved_frame = win->frame;
                     win->frame = {ds->screen_w / 2, PANEL_HEIGHT, ds->screen_w / 2, ds->screen_h - PANEL_HEIGHT};
                     win->state = WIN_MAXIMIZED;
-                    Rect cr = win->content_rect();
-                    if (cr.w != win->content_w || cr.h != win->content_h) {
-                        if (win->content) zenith::free(win->content);
-                        win->content_w = cr.w;
-                        win->content_h = cr.h;
-                        win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
-                        zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                    if (!win->external) {
+                        Rect cr = win->content_rect();
+                        if (cr.w != win->content_w || cr.h != win->content_h) {
+                            if (win->content) zenith::free(win->content);
+                            win->content_w = cr.w;
+                            win->content_h = cr.h;
+                            win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
+                            zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                        }
                     }
                 }
             }
@@ -903,14 +977,16 @@ void gui::desktop_handle_mouse(DesktopState* ds) {
             }
             if (left_released) {
                 win->resizing = false;
-                // Reallocate content buffer if dimensions changed
-                Rect cr = win->content_rect();
-                if (cr.w != win->content_w || cr.h != win->content_h) {
-                    if (win->content) zenith::free(win->content);
-                    win->content_w = cr.w;
-                    win->content_h = cr.h;
-                    win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
-                    zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                // Reallocate content buffer if dimensions changed (skip for external)
+                if (!win->external) {
+                    Rect cr = win->content_rect();
+                    if (cr.w != win->content_w || cr.h != win->content_h) {
+                        if (win->content) zenith::free(win->content);
+                        win->content_w = cr.w;
+                        win->content_h = cr.h;
+                        win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
+                        zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                    }
                 }
                 win->dirty = true;
             }
@@ -936,9 +1012,13 @@ void gui::desktop_handle_mouse(DesktopState* ds) {
                 case 3: open_calculator(ds); break;
                 case 4: open_texteditor(ds); break;
                 case 5: open_klog(ds); break;
-                case 6: open_wiki(ds); break;
-                case 7: open_settings(ds); break;
-                case 8: open_reboot_dialog(ds); break;
+                case 6: open_procmgr(ds); break;
+                case 7: open_mandelbrot(ds); break;
+                case 8: open_devexplorer(ds); break;
+                case 9: open_wiki(ds); break;
+                case 10: open_doom(ds); break;
+                case 11: open_settings(ds); break;
+                case 12: open_reboot_dialog(ds); break;
                 }
                 ds->app_menu_open = false;
             }
@@ -1046,13 +1126,16 @@ void gui::desktop_handle_mouse(DesktopState* ds) {
                     win->frame = {0, PANEL_HEIGHT, ds->screen_w, ds->screen_h - PANEL_HEIGHT};
                     win->state = WIN_MAXIMIZED;
                 }
-                Rect cr = win->content_rect();
-                if (cr.w != win->content_w || cr.h != win->content_h) {
-                    if (win->content) zenith::free(win->content);
-                    win->content_w = cr.w;
-                    win->content_h = cr.h;
-                    win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
-                    zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                // Reallocate content buffer for local windows only
+                if (!win->external) {
+                    Rect cr = win->content_rect();
+                    if (cr.w != win->content_w || cr.h != win->content_h) {
+                        if (win->content) zenith::free(win->content);
+                        win->content_w = cr.w;
+                        win->content_h = cr.h;
+                        win->content = (uint32_t*)zenith::alloc(cr.w * cr.h * 4);
+                        zenith::memset(win->content, 0xFF, cr.w * cr.h * 4);
+                    }
                 }
                 desktop_raise_window(ds, i);
                 return;
@@ -1097,10 +1180,22 @@ void gui::desktop_handle_mouse(DesktopState* ds) {
             if (cr.contains(mx, my)) {
                 desktop_raise_window(ds, i);
                 int new_idx = ds->window_count - 1;
-                if (ds->windows[new_idx].on_mouse) {
+                Window* raised = &ds->windows[new_idx];
+                if (raised->external) {
+                    // Forward mouse event to external window
+                    Zenith::WinEvent wev;
+                    zenith::memset(&wev, 0, sizeof(wev));
+                    wev.type = 1; // mouse
+                    wev.mouse.x = mx - cr.x;
+                    wev.mouse.y = my - cr.y;
+                    wev.mouse.scroll = ev.scroll;
+                    wev.mouse.buttons = buttons;
+                    wev.mouse.prev_buttons = prev;
+                    zenith::win_sendevent(raised->ext_win_id, &wev);
+                } else if (raised->on_mouse) {
                     ev.x = mx;
                     ev.y = my;
-                    ds->windows[new_idx].on_mouse(&ds->windows[new_idx], ev);
+                    raised->on_mouse(raised, ev);
                 }
                 return;
             }
@@ -1120,8 +1215,20 @@ void gui::desktop_handle_mouse(DesktopState* ds) {
     if (ev.scroll != 0 && ds->focused_window >= 0) {
         Window* win = &ds->windows[ds->focused_window];
         Rect cr = win->content_rect();
-        if (cr.contains(mx, my) && win->on_mouse) {
-            win->on_mouse(win, ev);
+        if (cr.contains(mx, my)) {
+            if (win->external) {
+                Zenith::WinEvent wev;
+                zenith::memset(&wev, 0, sizeof(wev));
+                wev.type = 1; // mouse
+                wev.mouse.x = mx - cr.x;
+                wev.mouse.y = my - cr.y;
+                wev.mouse.scroll = ev.scroll;
+                wev.mouse.buttons = buttons;
+                wev.mouse.prev_buttons = prev;
+                zenith::win_sendevent(win->ext_win_id, &wev);
+            } else if (win->on_mouse) {
+                win->on_mouse(win, ev);
+            }
         }
     }
 
@@ -1147,10 +1254,8 @@ void gui::desktop_handle_mouse(DesktopState* ds) {
 }
 
 void gui::desktop_handle_keyboard(DesktopState* ds, const Zenith::KeyEvent& key) {
-    if (!key.pressed) return;
-
-    // Global shortcuts
-    if (key.ctrl && key.alt) {
+    // Global shortcuts (only on key press)
+    if (key.pressed && key.ctrl && key.alt) {
         if (key.ascii == 't' || key.ascii == 'T') {
             open_terminal(ds);
             return;
@@ -1175,17 +1280,121 @@ void gui::desktop_handle_keyboard(DesktopState* ds, const Zenith::KeyEvent& key)
             open_klog(ds);
             return;
         }
+        if (key.ascii == 'd' || key.ascii == 'D') {
+            open_doom(ds);
+            return;
+        }
     }
 
     // Dispatch to focused window
     if (ds->focused_window >= 0 && ds->focused_window < ds->window_count) {
         Window* win = &ds->windows[ds->focused_window];
-        if (win->on_key) {
+        if (win->external) {
+            // Forward key event to external window via syscall
+            Zenith::WinEvent ev;
+            zenith::memset(&ev, 0, sizeof(ev));
+            ev.type = 0; // key
+            ev.key = key;
+            zenith::win_sendevent(win->ext_win_id, &ev);
+        } else if (win->on_key) {
             win->on_key(win, key);
         }
     }
 }
 
+// ============================================================================
+// External Window Polling
+// ============================================================================
+
+void desktop_poll_external_windows(DesktopState* ds) {
+    Zenith::WinInfo extWins[8];
+    int extCount = zenith::win_enumerate(extWins, 8);
+
+    // Check for new external windows and map them
+    for (int e = 0; e < extCount; e++) {
+        int extId = extWins[e].id;
+
+        // Check if we already have this window
+        bool found = false;
+        for (int i = 0; i < ds->window_count; i++) {
+            if (ds->windows[i].external && ds->windows[i].ext_win_id == extId) {
+                found = true;
+                // Update dirty flag
+                if (extWins[e].dirty) {
+                    ds->windows[i].dirty = true;
+                }
+                break;
+            }
+        }
+
+        if (!found && ds->window_count < MAX_WINDOWS) {
+            // Map the pixel buffer into our address space
+            uint64_t va = zenith::win_map(extId);
+            if (va == 0) continue;
+
+            int idx = ds->window_count;
+            Window* win = &ds->windows[idx];
+            zenith::memset(win, 0, sizeof(Window));
+
+            zenith::strncpy(win->title, extWins[e].title, MAX_TITLE_LEN);
+            int w = extWins[e].width;
+            int h = extWins[e].height;
+            // Position the window centered-ish
+            int wx = (ds->screen_w - w - 2 * BORDER_WIDTH) / 2 + idx * 30;
+            int wy = PANEL_HEIGHT + 20 + idx * 30;
+            win->frame = {wx, wy, w + 2 * BORDER_WIDTH, h + TITLEBAR_HEIGHT + BORDER_WIDTH};
+            win->state = WIN_NORMAL;
+            win->z_order = idx;
+            win->focused = true;
+            win->dirty = true;
+            win->dragging = false;
+            win->resizing = false;
+            win->saved_frame = win->frame;
+
+            // Point content to the shared pixel buffer
+            win->content = (uint32_t*)va;
+            win->content_w = w;
+            win->content_h = h;
+
+            win->on_draw = nullptr;
+            win->on_mouse = nullptr;
+            win->on_key = nullptr;
+            win->on_close = nullptr;
+            win->on_poll = nullptr;
+            win->app_data = nullptr;
+            win->external = true;
+            win->ext_win_id = extId;
+
+            // Unfocus previous window
+            if (ds->focused_window >= 0 && ds->focused_window < ds->window_count) {
+                ds->windows[ds->focused_window].focused = false;
+            }
+            ds->focused_window = idx;
+            ds->window_count++;
+        }
+    }
+
+    // Check for removed external windows (process exited)
+    for (int i = ds->window_count - 1; i >= 0; i--) {
+        if (!ds->windows[i].external) continue;
+
+        int extId = ds->windows[i].ext_win_id;
+        bool stillExists = false;
+        for (int e = 0; e < extCount; e++) {
+            if (extWins[e].id == extId) {
+                stillExists = true;
+                break;
+            }
+        }
+
+        if (!stillExists) {
+            // Window gone — remove without freeing content (shared memory)
+            ds->windows[i].content = nullptr; // prevent free
+            gui::desktop_close_window(ds, i);
+        }
+    }
+}
+
 void gui::desktop_run(DesktopState* ds) {
     for (;;) {
         // Poll mouse state
@@ -1199,6 +1408,9 @@ void gui::desktop_run(DesktopState* ds) {
             desktop_handle_keyboard(ds, key);
         }
 
+        // Poll external windows (discover new, remove dead, update dirty)
+        desktop_poll_external_windows(ds);
+
         // Poll windows that have a poll callback
         for (int i = 0; i < ds->window_count; i++) {
             Window* win = &ds->windows[i];
diff --git a/programs/src/desktop/stb_truetype_impl.cpp b/programs/src/desktop/stb_truetype_impl.cpp
new file mode 100644
index 0000000..c598111
--- /dev/null
+++ b/programs/src/desktop/stb_truetype_impl.cpp
@@ -0,0 +1,35 @@
+/*
+    * stb_truetype_impl.cpp
+    * Single compilation unit for stb_truetype in ZenithOS freestanding environment
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include <cstdint>
+#include <cstddef>
+#include <zenith/heap.h>
+#include <zenith/string.h>
+#include <gui/stb_math.h>
+
+// Override all stb_truetype dependencies before including the implementation
+
+#define STBTT_ifloor(x)   ((int) stb_floor(x))
+#define STBTT_iceil(x)    ((int) stb_ceil(x))
+#define STBTT_sqrt(x)     stb_sqrt(x)
+#define STBTT_pow(x,y)    stb_pow(x,y)
+#define STBTT_fmod(x,y)   stb_fmod(x,y)
+#define STBTT_cos(x)      stb_cos(x)
+#define STBTT_acos(x)     stb_acos(x)
+#define STBTT_fabs(x)     stb_fabs(x)
+
+#define STBTT_malloc(x,u)  ((void)(u), zenith::malloc(x))
+#define STBTT_free(x,u)    ((void)(u), zenith::mfree(x))
+
+#define STBTT_memcpy(d,s,n) zenith::memcpy(d,s,n)
+#define STBTT_memset(d,v,n) zenith::memset(d,v,n)
+
+#define STBTT_strlen(x)    zenith::slen(x)
+
+#define STBTT_assert(x)    ((void)(x))
+
+#define STB_TRUETYPE_IMPLEMENTATION
+#include <gui/stb_truetype.h>
diff --git a/programs/src/doom/doomgeneric_zenith.c b/programs/src/doom/doomgeneric_zenith.c
index 161c5b8..f386599 100644
--- a/programs/src/doom/doomgeneric_zenith.c
+++ b/programs/src/doom/doomgeneric_zenith.c
@@ -1,6 +1,6 @@
 /*
     * doomgeneric_zenith.c
-    * DOOM platform implementation for ZenithOS
+    * DOOM platform implementation for ZenithOS (standalone window server client)
     * Copyright (c) 2025 Daniel Hammer
 */
 
@@ -30,41 +30,70 @@ static inline long _zos_syscall1(long nr, long a1) {
     return ret;
 }
 
+static inline long _zos_syscall2(long nr, long a1, long a2) {
+    long ret;
+    __asm__ volatile(
+        "mov %[a1], %%rdi\n\t"
+        "mov %[a2], %%rsi\n\t"
+        "syscall"
+        : "=a"(ret)
+        : "a"(nr), [a1] "r"(a1), [a2] "r"(a2)
+        : "rcx", "r11", "rdi", "rsi", "rdx", "r8", "r9", "r10", "memory");
+    return ret;
+}
+
+static inline long _zos_syscall4(long nr, long a1, long a2, long a3, long a4) {
+    long ret;
+    __asm__ volatile(
+        "mov %[a1], %%rdi\n\t"
+        "mov %[a2], %%rsi\n\t"
+        "mov %[a3], %%rdx\n\t"
+        "mov %[a4], %%r10\n\t"
+        "syscall"
+        : "=a"(ret)
+        : "a"(nr), [a1] "r"(a1), [a2] "r"(a2), [a3] "r"(a3), [a4] "r"(a4)
+        : "rcx", "r11", "rdi", "rsi", "rdx", "r8", "r9", "r10", "memory");
+    return ret;
+}
+
 /* Syscall numbers (must match kernel/src/Api/Syscall.hpp) */
 #define SYS_EXIT            0
 #define SYS_SLEEP_MS        2
 #define SYS_PRINT           4
 #define SYS_GETMILLISECONDS 14
-#define SYS_ISKEYAVAILABLE  16
-#define SYS_GETKEY          17
-#define SYS_FBINFO          21
-#define SYS_FBMAP           22
+#define SYS_WINCREATE       54
+#define SYS_WINDESTROY      55
+#define SYS_WINPRESENT      56
+#define SYS_WINPOLL         57
 
-/* FbInfo struct (must match kernel definition) */
-struct FbInfo {
-    unsigned long width;
-    unsigned long height;
-    unsigned long pitch;
-    unsigned long bpp;
-    unsigned long userAddr;
+/* Window server structs (must match Zenith::WinCreateResult and Zenith::WinEvent) */
+struct WinCreateResult {
+    int      id;        /* -1 on failure */
+    unsigned _pad;
+    unsigned long pixelVa;  /* VA of pixel buffer in caller's address space */
 };
 
-/* KeyEvent struct (must match kernel definition) */
-struct KeyEvent {
-    unsigned char scancode;
-    char          ascii;
-    unsigned char pressed;
-    unsigned char shift;
-    unsigned char ctrl;
-    unsigned char alt;
+struct WinEvent {
+    unsigned char type;     /* 0=key, 1=mouse, 2=resize, 3=close */
+    unsigned char _pad[3];
+    union {
+        struct {
+            unsigned char scancode;
+            char          ascii;
+            unsigned char pressed;
+            unsigned char shift;
+            unsigned char ctrl;
+            unsigned char alt;
+        } key;
+        struct { int x, y, scroll; unsigned char buttons, prev_buttons; } mouse;
+        struct { int w, h; } resize;
+    };
 };
 
-/* ---- Framebuffer state ---- */
+/* ---- Window state ---- */
 
-static uint32_t* g_fbPtr    = 0;
-static uint32_t  g_fbWidth  = 0;
-static uint32_t  g_fbHeight = 0;
-static uint32_t  g_fbPitch  = 0; /* bytes per scanline */
+static int       g_winId   = -1;
+static uint32_t* g_pixBuf  = 0;
 
 /* ---- Circular key queue ---- */
 
@@ -115,8 +144,8 @@ static unsigned char scancode_to_doomkey(unsigned char scancode, char ascii) {
         case 0x4D: return KEY_RIGHTARROW;
         case 0x1C: return KEY_ENTER;
         case 0x01: return KEY_ESCAPE;
-        case 0x39: return ' ';          /* Space = use */
-        case 0x1D: return KEY_RCTRL;    /* LCtrl = fire */
+        case 0x39: return KEY_USE;      /* Space = use */
+        case 0x1D: return KEY_FIRE;     /* LCtrl = fire */
         case 0x2A: return KEY_RSHIFT;   /* LShift = run */
         case 0x36: return KEY_RSHIFT;   /* RShift = run */
         case 0x38: return KEY_RALT;     /* Alt = strafe */
@@ -146,22 +175,26 @@ static unsigned char scancode_to_doomkey(unsigned char scancode, char ascii) {
     }
 }
 
-/* ---- Poll keyboard and enqueue events ---- */
+/* ---- Poll window events and enqueue key events ---- */
 
 static void poll_keyboard(void) {
-    while (_zos_syscall0(SYS_ISKEYAVAILABLE)) {
-        struct KeyEvent evt;
-        _zos_syscall1(SYS_GETKEY, (long)&evt);
+    struct WinEvent evt;
+    while (_zos_syscall2(SYS_WINPOLL, (long)g_winId, (long)&evt) > 0) {
+        if (evt.type == 0) {
+            /* Key event */
+            unsigned char baseSc = evt.key.scancode & 0x7F;
 
-        unsigned char baseSc = evt.scancode & 0x7F; /* strip break bit */
+            char ascii = 0;
+            if (baseSc < 128)
+                ascii = scancode_to_ascii[baseSc];
 
-        char ascii = 0;
-        if (baseSc < 128)
-            ascii = scancode_to_ascii[baseSc];
-
-        unsigned char dk = scancode_to_doomkey(baseSc, ascii);
-        if (dk != 0) {
-            key_queue_push(evt.pressed ? 1 : 0, dk);
+            unsigned char dk = scancode_to_doomkey(baseSc, ascii);
+            if (dk != 0) {
+                key_queue_push(evt.key.pressed ? 1 : 0, dk);
+            }
+        } else if (evt.type == 3) {
+            /* Close event — exit the process */
+            _zos_syscall1(SYS_EXIT, 0);
         }
     }
 }
@@ -169,38 +202,30 @@ static void poll_keyboard(void) {
 /* ---- DG platform functions ---- */
 
 void DG_Init(void) {
-    struct FbInfo info;
-    _zos_syscall1(SYS_FBINFO, (long)&info);
+    struct WinCreateResult result;
+    _zos_syscall4(SYS_WINCREATE, (long)"DOOM", (long)DOOMGENERIC_RESX,
+                  (long)DOOMGENERIC_RESY, (long)&result);
 
-    g_fbWidth  = (uint32_t)info.width;
-    g_fbHeight = (uint32_t)info.height;
-    g_fbPitch  = (uint32_t)info.pitch;
+    if (result.id < 0) {
+        _zos_syscall1(SYS_EXIT, 1);
+    }
 
-    g_fbPtr = (uint32_t*)(unsigned long)_zos_syscall0(SYS_FBMAP);
-
-    printf("DOOM: framebuffer %ux%u pitch=%u mapped at %p\n",
-           g_fbWidth, g_fbHeight, g_fbPitch, (void*)g_fbPtr);
+    g_winId  = result.id;
+    g_pixBuf = (uint32_t*)result.pixelVa;
 }
 
 void DG_DrawFrame(void) {
     /* Poll keyboard first */
     poll_keyboard();
 
-    /* Copy DG_ScreenBuffer (DOOMGENERIC_RESX x DOOMGENERIC_RESY) to framebuffer */
-    if (g_fbPtr == 0 || DG_ScreenBuffer == 0) return;
+    /* Copy DG_ScreenBuffer into the shared pixel buffer */
+    if (g_pixBuf == 0 || DG_ScreenBuffer == 0) return;
 
-    uint32_t copyW = DOOMGENERIC_RESX;
-    uint32_t copyH = DOOMGENERIC_RESY;
-    if (copyW > g_fbWidth)  copyW = g_fbWidth;
-    if (copyH > g_fbHeight) copyH = g_fbHeight;
+    memcpy(g_pixBuf, DG_ScreenBuffer,
+           DOOMGENERIC_RESX * DOOMGENERIC_RESY * sizeof(uint32_t));
 
-    uint32_t fbStride = g_fbPitch / 4; /* pixels per scanline */
-
-    for (uint32_t y = 0; y < copyH; y++) {
-        uint32_t* dst = g_fbPtr + y * fbStride;
-        uint32_t* src = DG_ScreenBuffer + y * DOOMGENERIC_RESX;
-        memcpy(dst, src, copyW * sizeof(uint32_t));
-    }
+    /* Mark window as dirty so the compositor picks it up */
+    _zos_syscall1(SYS_WINPRESENT, (long)g_winId);
 }
 
 void DG_SleepMs(uint32_t ms) {
diff --git a/programs/src/doom/libc.c b/programs/src/doom/libc.c
index 274e04a..db603d5 100644
--- a/programs/src/doom/libc.c
+++ b/programs/src/doom/libc.c
@@ -712,27 +712,22 @@ int sprintf(char *buf, const char *fmt, ...) {
 static char _printbuf[4096];
 
 int vprintf(const char *fmt, va_list ap) {
-    int ret = vsnprintf(_printbuf, sizeof(_printbuf), fmt, ap);
-    _zos_syscall1(SYS_PRINT, (long)_printbuf);
-    return ret;
+    (void)fmt; (void)ap;
+    return 0;
 }
 
 int printf(const char *fmt, ...) {
-    va_list ap;
-    va_start(ap, fmt);
-    int ret = vprintf(fmt, ap);
-    va_end(ap);
-    return ret;
+    (void)fmt;
+    return 0;
 }
 
 int puts(const char *s) {
-    _zos_syscall1(SYS_PRINT, (long)s);
-    _zos_syscall1(SYS_PUTCHAR, (long)'\n');
+    (void)s;
     return 0;
 }
 
 int putchar(int c) {
-    _zos_syscall1(SYS_PUTCHAR, (long)c);
+    (void)c;
     return c;
 }
 
@@ -862,20 +857,8 @@ size_t fread(void *ptr, size_t size, size_t nmemb, FILE *fp) {
 size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *fp) {
     if (fp == NULL) return 0;
 
-    /* stdout/stderr: write to terminal */
+    /* stdout/stderr: discard (no terminal in windowed mode) */
     if (fp->is_std == 1 || fp->is_std == 2) {
-        /* Write as string to terminal */
-        size_t total = size * nmemb;
-        const char *s = (const char *)ptr;
-        char buf[512];
-        while (total > 0) {
-            size_t chunk = total > 511 ? 511 : total;
-            memcpy(buf, s, chunk);
-            buf[chunk] = '\0';
-            _zos_syscall1(SYS_PRINT, (long)buf);
-            s += chunk;
-            total -= chunk;
-        }
         return nmemb;
     }
 
@@ -970,31 +953,18 @@ char *fgets(char *s, int size, FILE *fp) {
 }
 
 int fputs(const char *s, FILE *fp) {
-    size_t len = strlen(s);
-    return fwrite(s, 1, len, fp) > 0 ? 0 : -1;
+    (void)s; (void)fp;
+    return 0;
 }
 
 int fprintf(FILE *fp, const char *fmt, ...) {
-    char buf[4096];
-    va_list ap;
-    va_start(ap, fmt);
-    int ret = vsnprintf(buf, sizeof(buf), fmt, ap);
-    va_end(ap);
-
-    if (fp == stdout || fp == stderr || (fp && fp->is_std)) {
-        _zos_syscall1(SYS_PRINT, (long)buf);
-    }
-    return ret;
+    (void)fp; (void)fmt;
+    return 0;
 }
 
 int vfprintf(FILE *fp, const char *fmt, va_list ap) {
-    char buf[4096];
-    int ret = vsnprintf(buf, sizeof(buf), fmt, ap);
-
-    if (fp == stdout || fp == stderr || (fp && fp->is_std)) {
-        _zos_syscall1(SYS_PRINT, (long)buf);
-    }
-    return ret;
+    (void)fp; (void)fmt; (void)ap;
+    return 0;
 }
 
 int sscanf(const char *str, const char *fmt, ...) {
@@ -1069,11 +1039,7 @@ int sscanf(const char *str, const char *fmt, ...) {
 }
 
 void perror(const char *s) {
-    if (s && *s) {
-        _zos_syscall1(SYS_PRINT, (long)s);
-        _zos_syscall1(SYS_PRINT, (long)": ");
-    }
-    _zos_syscall1(SYS_PRINT, (long)"error\n");
+    (void)s;
 }
 
 int rename(const char *old, const char *new_) {
diff --git a/ramdisk.tar b/ramdisk.tar
index 115da62..0d220df 100644
Binary files a/ramdisk.tar and b/ramdisk.tar differ
diff --git a/scripts/copy_fonts.sh b/scripts/copy_fonts.sh
new file mode 100755
index 0000000..1531bf7
--- /dev/null
+++ b/scripts/copy_fonts.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+# copy_fonts.sh - Copy TTF fonts for the desktop environment
+# Usage: ./scripts/copy_fonts.sh (from project root or programs/ directory)
+
+set -e
+
+# Find project root relative to this script's location
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+FONT_DST="$PROJECT_ROOT/programs/bin/fonts"
+
+mkdir -p "$FONT_DST"
+
+FONTS=(
+    "programs/gui/fonts/Roboto/static/Roboto-Regular.ttf"
+    "programs/gui/fonts/Roboto/static/Roboto-Bold.ttf"
+    "programs/gui/fonts/Roboto/static/Roboto-Medium.ttf"
+    "programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Regular.ttf"
+    "programs/gui/fonts/JetBrains_Mono/static/JetBrainsMono-Bold.ttf"
+)
+
+copied=0
+for font in "${FONTS[@]}"; do
+    src="$PROJECT_ROOT/$font"
+    name=$(basename "$font")
+    dst="$FONT_DST/$name"
+    if [ -f "$src" ]; then
+        cp "$src" "$dst"
+        copied=$((copied + 1))
+    else
+        echo "copy_fonts: warning: $src not found" >&2
+    fi
+done
+
+echo "copy_fonts: copied $copied fonts to $FONT_DST"
diff --git a/scripts/copy_icons.sh b/scripts/copy_icons.sh
index 5dd5c0b..9f6d474 100755
--- a/scripts/copy_icons.sh
+++ b/scripts/copy_icons.sh
@@ -52,6 +52,11 @@ ICONS=(
     "mimetypes/scalable/application-x-executable.svg"
     "categories/scalable/help-about.svg"
     "categories/scalable/system-reboot.svg"
+    "apps/scalable/doom.svg"
+    "apps/scalable/system-monitor.svg"
+    "apps/scalable/applications-science.svg"
+    "apps/scalable/hardware.svg"
+    "apps/scalable/unsettings.svg" # settings icon; toolbox in flat remix
 )
 
 copied=0