sdl_v1.2.cpp

static void DrawSurfaceToScreen()
{
	int n = _num_dirty_rects;
	if (n == 0) return;

	_num_dirty_rects = 0;
	if (n > MAX_DIRTY_RECTS) {
		if (_sdl_screen != _sdl_realscreen) {
			SDL_CALL SDL_BlitSurface(_sdl_screen, NULL, _sdl_realscreen, NULL);
		}
		SDL_CALL SDL_UpdateRect(_sdl_realscreen, 0, 0, 0, 0);
	} else {
		if (_sdl_screen != _sdl_realscreen) {
			for (int i = 0; i < n; i++) {
				SDL_CALL SDL_BlitSurface(_sdl_screen, &_dirty_rects[i], _sdl_realscreen, &_dirty_rects[i]);
			}
		}
		SDL_CALL SDL_UpdateRects(_sdl_realscreen, n, _dirty_rects);
	}
}