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Fixed SDL_SetAlpha compatibility function to match the documentation

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This commit is contained in:
Sam Lantinga
2008-12-06 05:49:53 +00:00
parent 3d4a455ae4
commit b89eada0b9
1 changed files with 7 additions and 4 deletions
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11
src/SDL_compat.c
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@@ -686,16 +686,19 @@ SDL_GetVideoSurface(void)
int
SDL_SetAlpha(SDL_Surface * surface, Uint32 flag, Uint8 value)
{
if (flag & SDL_RLEACCEL) {
SDL_SetSurfaceRLE(surface, 1);
}
if (flag) {
if (flag & SDL_SRCALPHA) {
/* According to the docs, value is ignored for alpha surfaces */
if (surface->format->Amask) {
value = 0xFF;
}
SDL_SetSurfaceAlphaMod(surface, value);
SDL_SetSurfaceBlendMode(surface, SDL_TEXTUREBLENDMODE_BLEND);
} else {
SDL_SetSurfaceAlphaMod(surface, 0xFF);
SDL_SetSurfaceBlendMode(surface, SDL_TEXTUREBLENDMODE_NONE);
}
SDL_SetSurfaceRLE(surface, (flag & SDL_RLEACCEL));
return 0;
}