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Added support for textures with palettes

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Closes https://github.com/libsdl-org/SDL/pull/6192
This commit is contained in:
Sam Lantinga
2025-09-26 11:44:04 -07:00
parent d42bf59c66
commit 0b4b254a53
11 changed files with 728 additions and 74 deletions
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18
src/render/software/SDL_render_sw.c
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@@ -126,6 +126,20 @@ static bool SW_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture, SDL_P
return true;
}
static bool SW_UpdateTexturePalette(SDL_Renderer *renderer, SDL_Texture *texture)
{
SDL_Surface *surface = (SDL_Surface *)texture->internal;
SDL_Palette *palette = texture->palette;
if (!surface->palette) {
surface->palette = SDL_CreatePalette(1 << SDL_BITSPERPIXEL(surface->format));
if (!surface->palette) {
return false;
}
}
return SDL_SetPaletteColors(surface->palette, palette->colors, 0, palette->ncolors);
}
static bool SW_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture,
const SDL_Rect *rect, const void *pixels, int pitch)
{
@@ -1115,6 +1129,9 @@ static void SW_SelectBestFormats(SDL_Renderer *renderer, SDL_PixelFormat format)
SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_XRGB8888);
SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_ARGB8888);
}
// Add 8-bit palettized format
SDL_AddSupportedTextureFormat(renderer, SDL_PIXELFORMAT_INDEX8);
}
bool SW_CreateRendererForSurface(SDL_Renderer *renderer, SDL_Surface *surface, SDL_PropertiesID create_props)
@@ -1142,6 +1159,7 @@ bool SW_CreateRendererForSurface(SDL_Renderer *renderer, SDL_Surface *surface, S
renderer->WindowEvent = SW_WindowEvent;
renderer->GetOutputSize = SW_GetOutputSize;
renderer->CreateTexture = SW_CreateTexture;
renderer->UpdateTexturePalette = SW_UpdateTexturePalette;
renderer->UpdateTexture = SW_UpdateTexture;
renderer->LockTexture = SW_LockTexture;
renderer->UnlockTexture = SW_UnlockTexture;