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Use SDL_PIXELFORMAT_INDEX8 for the debug font atlas

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This commit is contained in:
Cameron Cawley 2026-05-24 13:33:37 +01:00
parent 6c55fad411
commit 828eb71f8c
1 changed files with 16 additions and 9 deletions
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25
src/render/SDL_render.c
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@ -5941,6 +5941,11 @@ bool SDL_GetRenderVSync(SDL_Renderer *renderer, int *vsync)
static bool CreateDebugTextAtlas(SDL_Renderer *renderer)
{
static const SDL_Color colors[] = {
{ 255, 255, 255, SDL_ALPHA_TRANSPARENT },
{ 255, 255, 255, SDL_ALPHA_OPAQUE }
};
SDL_assert(renderer->debug_char_texture_atlas == NULL); // don't double-create it!
const int charWidth = SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE;
@ -5948,11 +5953,17 @@ static bool CreateDebugTextAtlas(SDL_Renderer *renderer)
// actually make each glyph two pixels taller/wider, to prevent scaling artifacts.
const int rows = (SDL_DEBUG_FONT_NUM_GLYPHS / SDL_DEBUG_FONT_GLYPHS_PER_ROW) + 1;
SDL_Surface *atlas = SDL_CreateSurface((charWidth + 2) * SDL_DEBUG_FONT_GLYPHS_PER_ROW, rows * (charHeight + 2), SDL_PIXELFORMAT_RGBA8888);
SDL_Surface *atlas = SDL_CreateSurface((charWidth + 2) * SDL_DEBUG_FONT_GLYPHS_PER_ROW, rows * (charHeight + 2), SDL_PIXELFORMAT_INDEX8);
if (!atlas) {
return false;
}
SDL_Palette *palette = SDL_CreateSurfacePalette(atlas);
if (!palette || !SDL_SetPaletteColors(palette, colors, 0, 2)) {
SDL_DestroySurface(atlas);
return false;
}
const int pitch = atlas->pitch;
SDL_memset(atlas->pixels, '\0', atlas->h * atlas->pitch);
@ -5960,19 +5971,14 @@ static bool CreateDebugTextAtlas(SDL_Renderer *renderer)
int row = 0;
for (int glyph = 0; glyph < SDL_DEBUG_FONT_NUM_GLYPHS; glyph++) {
// find top-left of this glyph in destination surface. The +2's account for glyph padding.
Uint8 *linepos = (((Uint8 *)atlas->pixels) + ((row * (charHeight + 2) + 1) * pitch)) + ((column * (charWidth + 2) + 1) * sizeof (Uint32));
Uint8 *linepos = (((Uint8 *)atlas->pixels) + ((row * (charHeight + 2) + 1) * pitch)) + ((column * (charWidth + 2) + 1) * sizeof (Uint8));
const Uint8 *charpos = SDL_RenderDebugTextFontData + (glyph * 8);
// Draw the glyph to the surface...
for (int iy = 0; iy < charHeight; iy++) {
Uint32 *curpos = (Uint32 *)linepos;
Uint8 *curpos = linepos;
for (int ix = 0; ix < charWidth; ix++) {
if ((*charpos) & (1 << ix)) {
*curpos = 0xffffffff;
} else {
*curpos = 0;
}
++curpos;
*curpos++ = (*charpos >> ix) & 1;
}
linepos += pitch;
++charpos;
@ -5992,6 +5998,7 @@ static bool CreateDebugTextAtlas(SDL_Renderer *renderer)
SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, atlas);
if (texture) {
SDL_SetTextureScaleMode(texture, SDL_SCALEMODE_PIXELART);
SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
renderer->debug_char_texture_atlas = texture;
}
SDL_DestroySurface(atlas);