feat: rudimentary userspace desktop environment
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/*
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* draw.hpp
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* ZenithOS drawing primitives (lines, circles, rounded rects, cursor)
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* Copyright (c) 2025 Daniel Hammer
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*/
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#pragma once
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#include "gui/gui.hpp"
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#include "gui/framebuffer.hpp"
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namespace gui {
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// Fast horizontal line
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inline void draw_hline(Framebuffer& fb, int x, int y, int w, Color c) {
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for (int i = 0; i < w; i++) fb.put_pixel(x + i, y, c);
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}
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// Fast vertical line
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inline void draw_vline(Framebuffer& fb, int x, int y, int h, Color c) {
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for (int i = 0; i < h; i++) fb.put_pixel(x, y + i, c);
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}
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// Rectangle outline
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inline void draw_rect(Framebuffer& fb, int x, int y, int w, int h, Color c) {
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draw_hline(fb, x, y, w, c);
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draw_hline(fb, x, y + h - 1, w, c);
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draw_vline(fb, x, y, h, c);
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draw_vline(fb, x + w - 1, y, h, c);
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}
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// Filled rounded rectangle using corner circles
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inline void fill_rounded_rect(Framebuffer& fb, int x, int y, int w, int h, int radius, Color c) {
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if (radius <= 0) {
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fb.fill_rect(x, y, w, h, c);
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return;
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}
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// Clamp radius to half the smaller dimension
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int max_r = gui_min(w / 2, h / 2);
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if (radius > max_r) radius = max_r;
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// Fill the center rectangle
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fb.fill_rect(x + radius, y, w - 2 * radius, h, c);
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// Fill the left and right strips (excluding corners)
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fb.fill_rect(x, y + radius, radius, h - 2 * radius, c);
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fb.fill_rect(x + w - radius, y + radius, radius, h - 2 * radius, c);
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// Draw the four rounded corners using midpoint circle
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int cx_tl = x + radius;
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int cy_tl = y + radius;
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int cx_tr = x + w - radius - 1;
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int cy_tr = y + radius;
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int cx_bl = x + radius;
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int cy_bl = y + h - radius - 1;
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int cx_br = x + w - radius - 1;
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int cy_br = y + h - radius - 1;
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int px = 0;
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int py = radius;
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int d = 1 - radius;
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while (px <= py) {
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// Top-left corner
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draw_hline(fb, cx_tl - py, cy_tl - px, py - radius + radius, c);
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draw_hline(fb, cx_tl - px, cy_tl - py, px, c);
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// Top-right corner
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draw_hline(fb, cx_tr + 1, cy_tr - px, py, c);
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draw_hline(fb, cx_tr + 1, cy_tr - py, px, c);
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// Bottom-left corner
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draw_hline(fb, cx_bl - py, cy_bl + px, py, c);
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draw_hline(fb, cx_bl - px, cy_bl + py, px, c);
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// Bottom-right corner
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draw_hline(fb, cx_br + 1, cy_br + px, py, c);
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draw_hline(fb, cx_br + 1, cy_br + py, px, c);
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if (d < 0) {
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d += 2 * px + 3;
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} else {
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d += 2 * (px - py) + 5;
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py--;
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}
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px++;
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}
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}
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// Filled circle (midpoint algorithm)
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inline void fill_circle(Framebuffer& fb, int cx, int cy, int r, Color c) {
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if (r <= 0) return;
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int x = 0;
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int y = r;
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int d = 1 - r;
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// Draw initial horizontal lines
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draw_hline(fb, cx - r, cy, 2 * r + 1, c);
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while (x < y) {
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if (d < 0) {
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d += 2 * x + 3;
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} else {
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d += 2 * (x - y) + 5;
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y--;
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draw_hline(fb, cx - x, cy + y + 1, 2 * x + 1, c);
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draw_hline(fb, cx - x, cy - y - 1, 2 * x + 1, c);
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}
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x++;
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draw_hline(fb, cx - y, cy + x, 2 * y + 1, c);
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draw_hline(fb, cx - y, cy - x, 2 * y + 1, c);
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}
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}
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// Circle outline (midpoint algorithm)
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inline void draw_circle(Framebuffer& fb, int cx, int cy, int r, Color c) {
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if (r <= 0) {
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fb.put_pixel(cx, cy, c);
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return;
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}
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int x = 0;
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int y = r;
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int d = 1 - r;
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while (x <= y) {
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fb.put_pixel(cx + x, cy + y, c);
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fb.put_pixel(cx - x, cy + y, c);
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fb.put_pixel(cx + x, cy - y, c);
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fb.put_pixel(cx - x, cy - y, c);
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fb.put_pixel(cx + y, cy + x, c);
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fb.put_pixel(cx - y, cy + x, c);
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fb.put_pixel(cx + y, cy - x, c);
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fb.put_pixel(cx - y, cy - x, c);
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if (d < 0) {
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d += 2 * x + 3;
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} else {
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d += 2 * (x - y) + 5;
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y--;
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}
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x++;
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}
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}
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// Bresenham line drawing
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inline void draw_line(Framebuffer& fb, int x0, int y0, int x1, int y1, Color c) {
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int dx = gui_abs(x1 - x0);
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int dy = gui_abs(y1 - y0);
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int sx = x0 < x1 ? 1 : -1;
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int sy = y0 < y1 ? 1 : -1;
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int err = dx - dy;
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for (;;) {
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fb.put_pixel(x0, y0, c);
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if (x0 == x1 && y0 == y1) break;
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int e2 = 2 * err;
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if (e2 > -dy) {
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err -= dy;
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x0 += sx;
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}
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if (e2 < dx) {
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err += dx;
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y0 += sy;
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}
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}
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}
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// Drop shadow: offset darker rectangles below/right
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inline void draw_shadow(Framebuffer& fb, int x, int y, int w, int h, int offset, Color shadow_color) {
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// Bottom shadow strip
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fb.fill_rect_alpha(x + offset, y + h, w, offset, shadow_color);
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// Right shadow strip
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fb.fill_rect_alpha(x + w, y + offset, offset, h, shadow_color);
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// Corner
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fb.fill_rect_alpha(x + w, y + h, offset, offset, shadow_color);
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}
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// 16x16 mouse cursor bitmaps
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// Outline (black, where design has '1')
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static constexpr uint16_t cursor_outline[16] = {
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0x8000, // 1000000000000000
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0xC000, // 1100000000000000
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0xA000, // 1010000000000000
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0x9000, // 1001000000000000
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0x8800, // 1000100000000000
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0x8400, // 1000010000000000
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0x8200, // 1000001000000000
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0x8100, // 1000000100000000
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0x8080, // 1000000010000000
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0x8040, // 1000000001000000
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0x8780, // 1000011110000000 (changed: row 10 = 1 2 2 2 2 2 1 1 1 1)
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0x9200, // 1001001000000000 (row 11 = 1 2 2 1 2 2 1)
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0xA900, // 1010100100000000 (row 12 = 1 2 1 0 1 2 2 1)
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0xC900, // 1100100100000000 (row 13 = 1 1 0 0 1 2 2 1)
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0x8480, // 1000010010000000 (row 14 = 1 0 0 0 0 1 2 2 1)
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0x0700, // 0000011100000000 (row 15 = 0 0 0 0 0 1 1 1)
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};
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// Fill (white, where design has '2')
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static constexpr uint16_t cursor_fill[16] = {
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0x0000, // row 0: no fill
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0x0000, // row 1: no fill
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0x4000, // row 2: 0100000000000000
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0x6000, // row 3: 0110000000000000
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0x7000, // row 4: 0111000000000000
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0x7800, // row 5: 0111100000000000
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0x7C00, // row 6: 0111110000000000
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0x7E00, // row 7: 0111111000000000
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0x7F00, // row 8: 0111111100000000
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0x7F80, // row 9: 0111111110000000
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0x7800, // row 10: 0111100000000000 (fill only in positions 1-5)
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0x6C00, // row 11: 0110110000000000 (fill at positions 1,2 and 4,5)
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0x4600, // row 12: 0100011000000000 (fill at position 1 and 5,6)
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0x0600, // row 13: 0000011000000000 (fill at positions 5,6)
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0x0300, // row 14: 0000001100000000 (fill at positions 6,7)
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0x0000, // row 15: no fill
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};
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// Draw the mouse cursor at (x, y)
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inline void draw_cursor(Framebuffer& fb, int x, int y) {
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Color black = colors::BLACK;
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Color white = colors::WHITE;
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for (int row = 0; row < 16; row++) {
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uint16_t outline = cursor_outline[row];
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uint16_t fill = cursor_fill[row];
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for (int col = 0; col < 16; col++) {
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uint16_t mask = (uint16_t)(0x8000 >> col);
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if (outline & mask) {
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fb.put_pixel(x + col, y + row, black);
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} else if (fill & mask) {
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fb.put_pixel(x + col, y + row, white);
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}
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}
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}
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}
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} // namespace gui
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