渲染结果似乎部分翻转了Miyoo mini

Question

我正在尝试移植游戏freedink https://savannah.gnu.gnu.gnu.gnu.gnu.org/git//git/？ group = freedink 到Miyoo Mini手持率。在第一次运行中，我看到了

1. splash屏幕
2. in da house：stats nes nats ney还可以
3. 房子倒塌了

经过一些调查后，我以为问题在 sdl_blitsurface 函数。将此代码更改

      {
    /* Copy splash to the background buffer so that D-Mod can
       start an effect from it (e.g. Pilgrim Quest's burning
       splash screen effect) */

    SDL_BlitSurface(splash, NULL, GFX_lpDDSTwo, NULL);
    SDL_FreeSurface(splash);
      }

    /* Copy splash screen (again) to the screen during loading time */
    SDL_BlitSurface(GFX_lpDDSTwo, NULL, GFX_lpDDSBack, NULL);

    flip_it();
  }

为此后：

      {
    /* Copy splash to the background buffer so that D-Mod can
       start an effect from it (e.g. Pilgrim Quest's burning
       splash screen effect) */

    SDL_BlitSurface(splash, NULL, GFX_lpDDSThird, NULL);        //First copy to GFX_lpDDSThird
    SDL_BlitSurface(GFX_lpDDSThird, NULL, GFX_lpDDSTwo, NULL);  //And only then to GFX_lpDDSTwo
    SDL_FreeSurface(splash);
      }

    /* Copy splash screen (again) to the screen during loading time */
    SDL_BlitSurface(GFX_lpDDSTwo, NULL, GFX_lpDDSBack, NULL);

    flip_it();
  }

Splash屏幕也被翻转。我的问题很简单：这种行为是否已知？如何解决这个问题？