+#endif
+
+static void SDLCopyColorKey(SDL_Surface *src_surface, SDL_Surface *dst_surface)
+{
+ Pixel color_key;
+ Uint8 r, g, b;
+
+ // check if source surface has a color key
+ if (SDL_GetColorKey(src_surface, &color_key) == 0)
+ {
+ // get RGB values of color key of source surface
+ SDL_GetRGB(color_key, src_surface->format, &r, &g, &b);
+
+ // get color key from RGB values in destination surface format
+ color_key = SDL_MapRGB(dst_surface->format, r, g, b);
+
+ // set color key in destination surface
+ SDL_SetColorKey(dst_surface, SET_TRANSPARENT_PIXEL, color_key);
+ }
+ else
+ {
+ // unset color key in destination surface
+ SDL_SetColorKey(dst_surface, UNSET_TRANSPARENT_PIXEL, 0);
+ }
+}