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Fixed bug 4798 - PNG w/transparency breaks in SDL 2.0.10 but works in SDL 2.0.9
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@ -959,6 +959,8 @@ SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,
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SDL_Color copy_color;
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SDL_Rect bounds;
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int ret;
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int palette_ck_transform = 0;
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int palette_ck_value = 0;
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if (!surface) {
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SDL_InvalidParamError("surface");
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@ -1019,8 +1021,23 @@ SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,
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bounds.y = 0;
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bounds.w = surface->w;
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bounds.h = surface->h;
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/* Transform colorkey to alpha. for cases where source palette has duplicate values, and colorkey is one of them */
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if (copy_flags & SDL_COPY_COLORKEY) {
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if (surface->format->palette && !format->palette) {
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palette_ck_transform = 1;
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palette_ck_value = surface->format->palette->colors[surface->map->info.colorkey].a;
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surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_TRANSPARENT;
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}
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}
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ret = SDL_LowerBlit(surface, &bounds, convert, &bounds);
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/* Restore value */
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if (palette_ck_transform) {
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surface->format->palette->colors[surface->map->info.colorkey].a = palette_ck_value;
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}
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/* Clean up the original surface, and update converted surface */
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convert->map->info.r = copy_color.r;
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convert->map->info.g = copy_color.g;
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@ -1055,7 +1072,9 @@ SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,
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surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) {
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/* The palette is identical, just set the same colorkey */
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SDL_SetColorKey(convert, 1, surface->map->info.colorkey);
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} else if (format->Amask) {
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} else if (!format->palette) {
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/* Was done by 'palette_ck_transform' */
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}else if (format->Amask) {
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set_colorkey_by_color = SDL_TRUE;
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ignore_alpha = SDL_FALSE;
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} else {
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