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fix blend mode for converted surface with alpha #4690

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fix blend mode for converted surface with alpha #4690

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2 changes: 1 addition & 1 deletion src/video/SDL_surface.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1298,7 +1298,7 @@ SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format,

/* Enable alpha blending by default if the new surface has an
* alpha channel or alpha modulation */
if ((surface->format->Amask && format->Amask) ||
if ((convert->format->Amask && format->Amask) ||
(palette_has_alpha && format->Amask) ||
(copy_flags & SDL_COPY_MODULATE_ALPHA)) {
SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND);
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