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blit: Add a case for 8-bit blits that sdl12-compat exposed.

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sdl12-compat can get into a state where a color-keyed surface is
marked for blending, but wants to blend with full alpha (which
is the same as _not_ blending), so rather than fail to find a
blitter in that case, it just selects the colorkey blitter.

Reference https://github.com/libsdl-org/sdl12-compat/issues/233
This commit is contained in:
Ryan C. Gordon 2023-05-16 14:38:44 -04:00
parent d42c303b24
commit 0eea92c8fc
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1 changed files with 3 additions and 0 deletions
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src/video/SDL_blit_1.c
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@ -533,6 +533,9 @@ SDL_CalculateBlit1(SDL_Surface *surface)
case SDL_COPY_COLORKEY:
return one_blitkey[which];
case SDL_COPY_COLORKEY | SDL_COPY_BLEND: /* this is not super-robust but handles a specific case we found sdl12-compat. */
return (surface->map->info.a == 255) ? one_blitkey[which] : (SDL_BlitFunc)NULL;
case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
/* Supporting 8bpp->8bpp alpha is doable but requires lots of
tables which consume space and takes time to precompute,