SDL_Surface *load_image( char *filename ) 

{

    //將圖象暫時存儲在這里
    SDL_Surface* loadedImage = NULL;
    //存儲最佳的圖象
    SDL_Surface* optimizedImage = NULL;
    //導入圖象
    loadedImage =  IMG_Load( filename );
    //如果導入圖象不為空
    if( loadedImage != NULL )
    {
        //建立最佳的圖象
        optimizedImage = SDL_DisplayFormat( loadedImage );
        //釋放老的圖象
        SDL_FreeSurface( loadedImage );
        if( optimizedImage != NULL )
        {
            //取得顏色碼
            Uint32 colorkey = SDL_MapRGB( optimizedImage->format, 0, 0, 0xFF );
            //設置顏色碼
            SDL_SetColorKey( optimizedImage, SDL_RLEACCEL | SDL_SRCCOLORKEY, colorkey );
        }
    }
    //返回最佳的圖象
    return optimizedImage;

}