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 utils::captureScreen(const std::function<void(bool, const std::string&)>& afterCaptured, const std::string& filename);