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libsdl-org · Jan 14, 2002 · f7f11f5 · f7f11f5
1 parent 5fa5b7a
commit f7f11f5
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/video/SDL_surface.c b/src/video/SDL_surface.c
@@ -711,6 +711,14 @@ SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface,
 		}
 	}
 
+	/* Only create hw surfaces with alpha channel if hw alpha blits
+	   are supported */
+	if(format->Amask != 0 && (flags & SDL_HWSURFACE)) {
+		const SDL_VideoInfo *vi = SDL_GetVideoInfo();
+		if(!vi || !vi->blit_hw_A)
+			flags &= ~SDL_HWSURFACE;
+	}
+
 	/* Create a new surface with the desired format */
 	convert = SDL_CreateRGBSurface(flags,
 				surface->w, surface->h, format->BitsPerPixel,