feat: rudimentary userspace desktop environment

2026-02-20 00:48:51 +01:00
parent 3753ebd4f4
commit 6eebc64863
27 changed files with 5027 additions and 9 deletions
@@ -0,0 +1,63 @@
+/*
+    * font.hpp
+    * ZenithOS 8x16 VGA bitmap font rendering
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include "gui/gui.hpp"
+#include "gui/framebuffer.hpp"
+
+namespace gui {
+
+static constexpr int FONT_WIDTH = 8;
+static constexpr int FONT_HEIGHT = 16;
+
+// Defined in font_data.cpp
+extern const uint8_t font_data[256 * 16];
+
+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++) {
+        uint8_t bits = glyph[row];
+        for (int col = 0; col < FONT_WIDTH; col++) {
+            if (bits & (0x80 >> col)) {
+                fb.put_pixel(x + col, y + row, fg);
+            }
+        }
+    }
+}
+
+inline void draw_char_bg(Framebuffer& fb, int x, int y, char c, Color fg, Color bg) {
+    const uint8_t* glyph = &font_data[(unsigned char)c * FONT_HEIGHT];
+    for (int row = 0; row < FONT_HEIGHT; row++) {
+        uint8_t bits = glyph[row];
+        for (int col = 0; col < FONT_WIDTH; col++) {
+            if (bits & (0x80 >> col)) {
+                fb.put_pixel(x + col, y + row, fg);
+            } else {
+                fb.put_pixel(x + col, y + row, bg);
+            }
+        }
+    }
+}
+
+inline void draw_text(Framebuffer& fb, int x, int y, const char* text, Color fg) {
+    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) {
+    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) {
+    int len = 0;
+    while (text[len]) len++;
+    return len * FONT_WIDTH;
+}
+
+} // namespace gui