2024-3-16-SDL2loadSurface

SDL_Surface* loadSurface( std::string path )
{
    // 两个指针变量

	SDL_Surface* optimizedSurface = NULL;

	SDL_Surface* loadedSurface = IMG_Load( path.c_str() );


	if( loadedSurface == NULL )// 如果 IMG_Load读取失败则返回空 以此抛出错误
	{
		std::cout << "Unable to load image %s! SDL_image Error: " << path.c_str() << IMG_GetError() << std::endl;
	}
	else
	{
		//Convert surface to screen format

		optimizedSurface = SDL_ConvertSurface( loadedSurface, gScreenSurface->format, 0 );
        // 使用SDL_ConvertSurface处理

		if( optimizedSurface == NULL )
		{
			std::cout << "Unable to optimize image %s! SDL Error: " << path.c_str() << SDL_GetError() << std::endl;
		}

		//Get rid of old loaded surface
		SDL_FreeSurface( loadedSurface );
	}

	return optimizedSurface;
}