// Software raster drawing. No window or native calls; pixels are packed RGB (0x00RRGGBB).
u32 BLACK = 0x000000;
u32 WHITE = 0xffffff;
u32 RED   = 0xe05252;
u32 GREEN = 0x48b88c;
u32 BLUE  = 0x558ee6;

// Components are clamped to bytes rather than wrapping.
val rgb = { int r, int g, int b ->
    r = r<0 ? 0 : r>255 ? 255 : r;
    g = g<0 ? 0 : g>255 ? 255 : g;
    b = b<0 ? 0 : b>255 ? 255 : b;
    u32 color = (r<<16) | (g<<8) | b;
    return color;
};

val Canvas = Canvas; // Pixel canvas and drawing methods