- static boolean initialization_needed = TRUE;
- static SDL_Surface *surface_screen_copy = NULL;
- static SDL_Surface *surface_black = NULL;
- SDL_Surface *surface_screen = backbuffer->surface;
- SDL_Surface *surface_cross; /* initialized later */
- boolean fade_reverse; /* initialized later */
- unsigned int time_last, time_current;
- float alpha;
- int alpha_final;
-
- if (initialization_needed)
- {
- unsigned int flags = SDL_SRCALPHA;
-
- /* use same surface type as screen surface */
- if ((surface_screen->flags & SDL_HWSURFACE))
- flags |= SDL_HWSURFACE;
- else
- flags |= SDL_SWSURFACE;
-
- /* create surface for temporary copy of screen buffer */
- if ((surface_screen_copy =
- SDL_CreateRGBSurface(flags,
- surface_screen->w,
- surface_screen->h,
- surface_screen->format->BitsPerPixel,
- surface_screen->format->Rmask,
- surface_screen->format->Gmask,
- surface_screen->format->Bmask,
- surface_screen->format->Amask)) == NULL)
- Error(ERR_EXIT, "SDL_CreateRGBSurface( ) failed: %s", SDL_GetError());
-
- /* create black surface for fading from/to black */
- if ((surface_black =
- SDL_CreateRGBSurface(flags,
- surface_screen->w,
- surface_screen->h,
- surface_screen->format->BitsPerPixel,
- surface_screen->format->Rmask,
- surface_screen->format->Gmask,
- surface_screen->format->Bmask,
- surface_screen->format->Amask)) == NULL)
- Error(ERR_EXIT, "SDL_CreateRGBSurface( ) failed: %s", SDL_GetError());
-
- /* completely fill the surface with black color pixels */
- SDL_FillRect(surface_black, NULL,
- SDL_MapRGB(surface_screen->format, 0, 0, 0));
-
- initialization_needed = FALSE;
- }