+void SDLFadeScreen(Bitmap *bitmap_cross, int fade_mode, int fade_delay,
+ int post_delay)
+{
+ 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 */
+ SDL_Rect src_rect, dst_rect;
+ int src_x = 0, src_y = 0;
+ int dst_x = 0, dst_y = 0;
+ boolean fade_reverse = (fade_mode == FADE_MODE_FADE_IN ? TRUE : FALSE);
+ unsigned int time_last, time_current;
+ float alpha;
+ int alpha_final;
+
+ src_rect.x = src_x;
+ src_rect.y = src_y;
+ src_rect.w = video.width;
+ src_rect.h = video.height;
+
+#ifdef FULLSCREEN_BUG
+ dst_x += video_xoffset;
+ dst_y += video_yoffset;
+#endif
+
+ dst_rect.x = dst_x;
+ dst_rect.y = dst_y;
+ dst_rect.w = video.width;
+ dst_rect.h = video.height;
+
+#if 0
+ if (!initialization_needed)
+ {
+ /* check if screen size has changed (can happen when toggling fullscreen) */
+ if (surface_screen_copy->w != surface_screen->w ||
+ surface_screen_copy->h != surface_screen->h)
+ {
+ SDL_FreeSurface(surface_screen_copy);
+ SDL_FreeSurface(surface_black);
+
+ initialization_needed = TRUE;
+ }
+ }
+#endif
+
+ 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,
+#if 1
+ video.width,
+ video.height,
+#else
+ surface_screen->w,
+ surface_screen->h,
+#endif
+ 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,
+#if 1
+ video.width,
+ video.height,
+#else
+ surface_screen->w,
+ surface_screen->h,
+#endif
+ 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;
+ }
+
+ /* copy the current screen backbuffer to the temporary screen copy buffer */
+ SDL_BlitSurface(surface_screen, &dst_rect, surface_screen_copy, &src_rect);
+
+ surface_cross = (fade_mode == FADE_MODE_CROSSFADE ? bitmap_cross->surface :
+ surface_black);
+
+ time_current = SDL_GetTicks();
+
+ for (alpha = 0.0; alpha < 255.0;)
+ {
+ time_last = time_current;
+ time_current = SDL_GetTicks();
+ alpha += 255 * ((float)(time_current - time_last) / fade_delay);
+ alpha_final = (int)(fade_reverse ? 255.0 - alpha : alpha);
+ alpha_final = MIN(MAX(0, alpha_final), 255);
+
+ /* draw existing image to screen buffer */
+ SDL_BlitSurface(surface_screen_copy, &src_rect, surface_screen, &dst_rect);
+
+ /* draw new image to screen buffer using alpha blending */
+ SDL_SetAlpha(surface_cross, SDL_SRCALPHA, alpha_final);
+ SDL_BlitSurface(surface_cross, &src_rect, surface_screen, &dst_rect);
+
+ /* draw screen buffer to visible display */
+ SDL_Flip(surface_screen);
+ }
+
+ Delay(post_delay);
+}
+
+void SDLDrawSimpleLine(Bitmap *dst_bitmap, int from_x, int from_y,
+ int to_x, int to_y, Uint32 color)