+
+ for (xx = 0; xx < xx_size;)
+ {
+ time_last = time_current;
+ time_current = SDL_GetTicks();
+ xx += xx_size * ((float)(time_current - time_last) / fade_delay);
+ xx_final = MIN(MAX(0, xx), xx_size);
+
+ src_rect.x = src_x;
+ src_rect.y = src_y;
+ src_rect.w = width;
+ src_rect.h = height;
+
+ dst_rect.x = dst_x;
+ dst_rect.y = dst_y;
+
+ /* draw new (target) image to screen buffer */
+ SDL_BlitSurface(surface_target, &src_rect, surface_screen, &dst_rect);
+
+ if (xx_final < xx_size)
+ {
+ src_rect.w = xx_size - xx_final;
+ src_rect.h = height;
+
+ /* draw old (source) image to screen buffer (left side) */
+
+ src_rect.x = src_x + xx_final;
+ dst_rect.x = dst_x;
+
+ SDL_BlitSurface(surface_source, &src_rect, surface_screen, &dst_rect);
+
+ /* draw old (source) image to screen buffer (right side) */
+
+ src_rect.x = src_x + xx_size;
+ dst_rect.x = dst_x + xx_size + xx_final;
+
+ SDL_BlitSurface(surface_source, &src_rect, surface_screen, &dst_rect);