cout <<"this image is empty"<<endl; } // cvtColor(src,COLOR_BGR2GRAY); cv::imshow("src",src); cv::waitKey(0); // cout <<"Hello SDL2"<< endl; //创建一个SDL_VIDEO窗口 SDL_Window* window = NULL; SDL_Renderer *renderer = NULL;//渲染器 SDL_Texture *texture = NULL;//纹理 ...