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Better scaling fallbacks for the SW renderer (bug 5313)

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This commit is contained in:
Sylvain Becker 2020-12-27 23:53:28 +01:00
parent a6beb2d264
commit c2735c0bb9
1 changed files with 55 additions and 15 deletions
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70
src/video/SDL_surface.c
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@ -944,33 +944,73 @@ SDL_PrivateLowerBlitScaled(SDL_Surface * src, SDL_Rect * srcrect,
/* fast path */
return SDL_SoftStretchLinear(src, srcrect, dst, dstrect);
} else {
/* Use an intermediate surface */
SDL_Surface *tmp;
/* Use intermediate surface(s) */
SDL_Surface *tmp1 = NULL;
int ret;
SDL_Rect tmprect;
SDL_Rect srcrect2;
int is_complex_copy_flags = (src->map->info.flags & complex_copy_flags);
Uint32 flags;
Uint8 r, g, b;
Uint8 alpha;
SDL_BlendMode blendMode;
tmp = SDL_CreateRGBSurfaceWithFormat(src->flags, dstrect->w, dstrect->h, 0, src->format->format);
/* Save source infos */
flags = src->flags;
SDL_GetSurfaceColorMod(src, &r, &g, &b);
SDL_GetSurfaceAlphaMod(src, &alpha);
SDL_GetSurfaceBlendMode(src, &blendMode);
srcrect2.x = srcrect->x;
srcrect2.y = srcrect->y;
srcrect2.w = srcrect->w;
srcrect2.h = srcrect->h;
SDL_SoftStretchLinear(src, srcrect, tmp, NULL);
/* Change source format if not appropriate for scaling */
if (src->format->BytesPerPixel != 4 || src->format->format == SDL_PIXELFORMAT_ARGB2101010) {
SDL_Rect tmprect;
int fmt;
tmprect.x = 0;
tmprect.y = 0;
tmprect.w = src->w;
tmprect.h = src->h;
if (dst->format->BytesPerPixel == 4 && dst->format->format != SDL_PIXELFORMAT_ARGB2101010) {
fmt = dst->format->format;
} else {
fmt = SDL_PIXELFORMAT_ARGB8888;
}
tmp1 = SDL_CreateRGBSurfaceWithFormat(flags, src->w, src->h, 0, fmt);
SDL_LowerBlit(src, srcrect, tmp1, &tmprect);
SDL_SetSurfaceColorMod(tmp, r, g, b);
SDL_SetSurfaceAlphaMod(tmp, alpha);
SDL_SetSurfaceBlendMode(tmp, blendMode);
srcrect2.x = 0;
srcrect2.y = 0;
SDL_SetSurfaceColorMod(tmp1, r, g, b);
SDL_SetSurfaceAlphaMod(tmp1, alpha);
SDL_SetSurfaceBlendMode(tmp1, blendMode);
src = tmp1;
}
tmprect.x = 0;
tmprect.y = 0;
tmprect.w = dstrect->w;
tmprect.h = dstrect->h;
ret = SDL_LowerBlit(tmp, &tmprect, dst, dstrect);
/* Intermediate scaling */
if (is_complex_copy_flags || src->format->format != dst->format->format) {
SDL_Rect tmprect;
SDL_Surface *tmp2 = SDL_CreateRGBSurfaceWithFormat(flags, dstrect->w, dstrect->h, 0, src->format->format);
SDL_SoftStretchLinear(src, &srcrect2, tmp2, NULL);
SDL_FreeSurface(tmp);
SDL_SetSurfaceColorMod(tmp2, r, g, b);
SDL_SetSurfaceAlphaMod(tmp2, alpha);
SDL_SetSurfaceBlendMode(tmp2, blendMode);
tmprect.x = 0;
tmprect.y = 0;
tmprect.w = dstrect->w;
tmprect.h = dstrect->h;
ret = SDL_LowerBlit(tmp2, &tmprect, dst, dstrect);
SDL_FreeSurface(tmp2);
} else {
ret = SDL_SoftStretchLinear(src, &srcrect2, dst, dstrect);
}
SDL_FreeSurface(tmp1);
return ret;
}
}