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Be explicit that we support the MSB variants of the 1bpp and 4bpp surface formats

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Fixes https://github.com/libsdl-org/SDL/issues/6242
This commit is contained in:
Sam Lantinga 2022-11-28 09:06:44 -08:00
parent 4f5e9fd5bd
commit 62f4fc6f35
1 changed files with 20 additions and 21 deletions
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41
src/video/SDL_blit_0.c
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@ -525,7 +525,7 @@ SDL_CalculateBlit0(SDL_Surface * surface)
int which;
/* 4bits to 32bits */
if (surface->format->BitsPerPixel == 4) {
if (surface->format->format == SDL_PIXELFORMAT_INDEX4MSB) {
if (surface->map->dst->format->BytesPerPixel == 4) {
switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
case 0:
@ -535,33 +535,32 @@ SDL_CalculateBlit0(SDL_Surface * surface)
return Blit4bto4Key;
}
}
/* We don't fully support 4-bit packed pixel modes */
return NULL;
}
if (surface->format->BitsPerPixel != 1) {
/* We don't support sub 8-bit packed pixel modes */
return (SDL_BlitFunc) NULL;
}
if (surface->map->dst->format->BitsPerPixel < 8) {
which = 0;
} else {
which = surface->map->dst->format->BytesPerPixel;
}
switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
case 0:
return bitmap_blit[which];
if (surface->format->format == SDL_PIXELFORMAT_INDEX1MSB) {
if (surface->map->dst->format->BitsPerPixel < 8) {
which = 0;
} else {
which = surface->map->dst->format->BytesPerPixel;
}
switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
case 0:
return bitmap_blit[which];
case SDL_COPY_COLORKEY:
return colorkey_blit[which];
case SDL_COPY_COLORKEY:
return colorkey_blit[which];
case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
return which >= 2 ? BlitBtoNAlpha : (SDL_BlitFunc) NULL;
case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
return which >= 2 ? BlitBtoNAlpha : (SDL_BlitFunc) NULL;
case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
return which >= 2 ? BlitBtoNAlphaKey : (SDL_BlitFunc) NULL;
case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
return which >= 2 ? BlitBtoNAlphaKey : (SDL_BlitFunc) NULL;
}
return NULL;
}
return (SDL_BlitFunc) NULL;
return NULL;
}
#endif /* SDL_HAVE_BLIT_0 */