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Scaling fallbacks for the SW renderer (bug 5313)

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Sylvain Becker 2020-12-27 23:00:11 +01:00
parent 040bd7a91b
commit 30df2e4e36
1 changed files with 43 additions and 8 deletions
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51
src/video/SDL_surface.c
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@ -927,17 +927,52 @@ SDL_PrivateLowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect,
SDL_InvalidateMap(src->map);
}
if ( !(src->map->info.flags & complex_copy_flags) &&
src->format->format == dst->format->format &&
!SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) {
if (scaleMode != SDL_ScaleModeNearest && src->format->BytesPerPixel == 4 && src->format->format != SDL_PIXELFORMAT_ARGB2101010) {
return SDL_SoftStretchLinear(src, srcrect, dst, dstrect);
} else {
if (scaleMode == SDL_ScaleModeNearest) {
if ( !(src->map->info.flags & complex_copy_flags) &&
src->format->format == dst->format->format &&
!SDL_ISPIXELFORMAT_INDEXED(src->format->format) ) {
return SDL_SoftStretch( src, srcrect, dst, dstrect );
} else {
return SDL_LowerBlit( src, srcrect, dst, dstrect );
}
} else {
return SDL_LowerBlit( src, srcrect, dst, dstrect );
if ( !(src->map->info.flags & complex_copy_flags) &&
src->format->format == dst->format->format &&
!SDL_ISPIXELFORMAT_INDEXED(src->format->format) &&
src->format->BytesPerPixel == 4 &&
src->format->format != SDL_PIXELFORMAT_ARGB2101010) {
/* fast path */
return SDL_SoftStretchLinear(src, srcrect, dst, dstrect);
} else {
/* Use an intermediate surface */
SDL_Surface *tmp;
int ret;
SDL_Rect tmprect;
Uint8 r, g, b, a;
Uint8 alpha;
SDL_BlendMode blendMode;
tmp = SDL_CreateRGBSurfaceWithFormat(src->flags, dstrect->w, dstrect->h, 0, src->format->format);
SDL_GetSurfaceColorMod(src, &r, &g, &b);
SDL_GetSurfaceAlphaMod(src, &alpha);
SDL_GetSurfaceBlendMode(src, &blendMode);
SDL_SoftStretchLinear(src, srcrect, tmp, NULL);
SDL_SetSurfaceColorMod(tmp, r, g, b);
SDL_SetSurfaceAlphaMod(tmp, alpha);
SDL_SetSurfaceBlendMode(tmp, blendMode);
tmprect.x = 0;
tmprect.y = 0;
tmprect.w = dstrect->w;
tmprect.h = dstrect->h;
ret = SDL_LowerBlit(tmp, &tmprect, dst, dstrect);
SDL_FreeSurface(tmp);
return ret;
}
}
}