Cocos2d-x 截图功能

2.x-3.x版本                 //获取屏幕尺寸  

      CCSize size = CCDirector::sharedDirector()->getWinSize();

      //使用屏幕尺寸初始化一个空的渲染纹理对象  

      CCRenderTexture* texture = CCRenderTexture::create((int)size.width, (int)size.height);

      //设置位置      

      texture->setPosition(ccp(size.width/2, size.height/2));

      //开始获取      

      texture->begin();

      //遍历场景节点对象，填充纹理到texure中  

      CCDirector::sharedDirector()->getRunningScene()->visit();

      //结束获取  

      texture->end();

      //保存为PNG图，Win32/Debug目录下  

      texture->saveToFile("screenshot.png", kCCImageFormatPNG);   

3.x-3.2x版本       Image::Format format;

      //进行后缀判断  

      if(std::string::npos != fileName.find_last_of(".")){

        auto extension = fileName.substr(fileName.find_last_of("."),fileName.length());

        if (!extension.compare(".png")) {

            format = Image::Format::PNG;

        } else if(!extension.compare(".jpg")) {

            format = Image::Format::JPG;

        } else{

            log("cocos2d: the image can only be saved as JPG or PNG format");

            return;

        }

    } else {

        log("cocos2d: the image can only be saved as JPG or PNG format");

        return ;

    }

    //获取屏幕尺寸，初始化一个空的渲染纹理对象  

      auto renderTexture = RenderTexture::create(getWinSize().width, getWinSize().height, Texture2D::PixelFormat::RGBA8888);

      //清空并开始获取  

      renderTexture->beginWithClear(0.0f, 0.0f, 0.0f, 0.0f);

      //遍历场景节点对象，填充纹理到RenderTexture中  

      getRunningScene()->visit();

      //结束获取  

      renderTexture->end();

      //保存文件  

      renderTexture->saveToFile(fileName , format);

      //使用schedule在下一帧中调用callback函数  

      auto fullPath = FileUtils::getInstance()->getWritablePath() + fileName;

      auto scheduleCallback = [&,fullPath,callback](float dt){

          callback(fullPath);

      };

      auto _schedule = getRunningScene()->getScheduler();

      _schedule->schedule(scheduleCallback, this, 0.0f,0,0.0f, false, "screenshot");

3.2x以后  void Util::captureScreen(const std::function<void(bool, const std::string&)>& afterCaptured, const std::string& filename);