cocos2d-x 3.0 final 截屏

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文章转载 http://www.cocoachina.com/bbs/read.php?tid=196339

1.集成到Director
这里选择把截屏功能继承到Director中，让全局的导演来执行截屏功能是一个很好的主意。

void Director::saveScreenshot(const std::string& fileName,const std::function<void(const std::string&)>& callback){    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{            CCLOG("cocos2d: the image can only be saved as JPG or PNG format");            return;        }    } else {        CCLOG("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");}

2.如何使用saveScreenshot
截屏功能使用起来也很简单，直接调用saveSecreenshot，其中第一个参数为文件名（支持png和jpg格式，不带后缀名默认为png格式），第二个参数为回调函数，你可以在回调函数中处理这个文件。

void ScreenshotTest::saveImage(Ref *pSender){    static int counter = 0;         char png[20];    sprintf(png, "image-%d.png", counter);    char jpg[20];    sprintf(jpg, "image-%d.jpg", counter);        //截屏后的回调函数，这里显示在左下角    auto callback = [&](const std::string& fullPath){        auto sprite = Sprite::create(fullPath);        CCASSERT(sprite!=nullptr, "Failed to create sprite.");        addChild(sprite);        sprite->setScale(0.3f);        sprite->setPosition(Point(40, 40));        sprite->setRotation(counter * 3);        CCLOG("Image saved %s", fullPath.c_str());    };        //调用Director的截屏功能    Director::getInstance()->saveScreenshot(png, callback);    counter++;}

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