C++ Timer::setStartTick方法代码示例

bool DummySensor::update(osg::NodeVisitor* nv) {

	//this is the main function of your video plugin
	//you can either retrieve images from your video stream/camera/file
	//or communicate with a thread to synchronize and get the data out
	
	//the most important is to synchronize your data
	//and copy the result to the VideoImageSteam used in this plugin
	//

	//0. you can collect some stats, for that you can use a timer
	osg::Timer t;

	{

	//1. mutex lock access to the image video stream
	OpenThreads::ScopedLock<OpenThreads::Mutex> _lock(this->getMutex());

	//2. you can copy here the video buffer to the main image video stream
	//with a call like
    //std::memcpy(_videoStreamList[0]->data(),newImage, _videoStreamList[0]->getImageSizeInBytes());
	// the newImage can be retrieved from another thread
	// in this example we do nothing (already make a dummy copy in init())

    osg::notify(osg::DEBUG_INFO)<<"osgART::DummySensor::update() get new image.."<<std::endl;

	//3. don't forget to call this to notify the rest of the application
	//that you have a new video image
    //_sensorDataList[0]->dirty();
	}

	//4. hopefully report some interesting data
	if (nv) {

		const osg::FrameStamp *framestamp = nv->getFrameStamp();

		if (framestamp && _stats.valid())
		{
			_stats->setAttribute(framestamp->getFrameNumber(),
				"Capture time taken", t.time_m());
		}
	}


	// Increase modified count every X ms to ensure tracker updates
	if (updateTimer.time_m() > 50) {
      //  _sensorDataList[0]->dirty();
		updateTimer.setStartTick();
	}

	return true;
}

/// Initializes the loop for viewer. Must be called from main thread.
void HeartBeat::init( osgViewer::ViewerBase *viewer )
{
    if( _viewer == viewer )
        return;

    stopTimer();

    _viewer = viewer;

    if( viewer )
    {
        _timerId = startTimer( 0 );
        _lastFrameStartTime.setStartTick( 0 );
    }
}

void HeartBeat::timerEvent( QTimerEvent */*event*/ )
{
    osg::ref_ptr< osgViewer::ViewerBase > viewer;
    if( !_viewer.lock( viewer ) )
    {
        // viewer has been deleted -> stop timer
        stopTimer();
        return;
    }

    // limit the frame rate
    if( viewer->getRunMaxFrameRate() > 0.0)
    {
        double dt = _lastFrameStartTime.time_s();
        double minFrameTime = 1.0 / viewer->getRunMaxFrameRate();
        if (dt < minFrameTime)
            OpenThreads::Thread::microSleep(static_cast<unsigned int>(1000000.0*(minFrameTime-dt)));
    }
    else
    {
        // avoid excessive CPU loading when no frame is required in ON_DEMAND mode
        if( viewer->getRunFrameScheme() == osgViewer::ViewerBase::ON_DEMAND )
        {
            double dt = _lastFrameStartTime.time_s();
            if (dt < 0.01)
                OpenThreads::Thread::microSleep(static_cast<unsigned int>(1000000.0*(0.01-dt)));
        }

        // record start frame time
        _lastFrameStartTime.setStartTick();

        // make frame
        if( viewer->getRunFrameScheme() == osgViewer::ViewerBase::ON_DEMAND )
        {
            if( viewer->checkNeedToDoFrame() )
            {
                viewer->frame();
            }
        }
        else
        {
            viewer->frame();
        }
    }
}

bool OpenNIVideo::update(osg::NodeVisitor* nv) {

	//this is the main function of your video plugin
	//you can either retrieve images from your video stream/camera/file
	//or communicate with a thread to synchronize and get the data out
	
	//the most important is to synchronize your data
	//and copy the result to the VideoImageSteam used in this plugin
	//

	//0. you can collect some stats, for that you can use a timer
	osg::Timer t;

	{

	//1. mutex lock access to the image video stream
	OpenThreads::ScopedLock<OpenThreads::Mutex> _lock(this->getMutex());

	osg::notify(osg::DEBUG_INFO)<<"osgART::OpenNIVideo::update() get new image.."<<std::endl;

	XnStatus nRetVal = XN_STATUS_OK;

	nRetVal=context.WaitAndUpdateAll();
	CHECK_RC(nRetVal, "Update Data");

	xnFPSMarkFrame(&xnFPS);

	depth_generator.GetMetaData(depthMD);
	const XnDepthPixel* pDepthMap = depthMD.Data();
	//depth pixel floating point depth map.
	
	image_generator.GetMetaData(imageMD);
	const XnUInt8* pImageMap = imageMD.Data();

	// Hybrid mode isn't supported in this sample
	if (imageMD.FullXRes() != depthMD.FullXRes() || imageMD.FullYRes() != depthMD.FullYRes())
	{
		std::cerr<<"The device depth and image resolution must be equal!"<<std::endl;
		exit(1);
	}

	// RGB is the only image format supported.
	if (imageMD.PixelFormat() != XN_PIXEL_FORMAT_RGB24)
	{
		std::cerr<<"The device image format must be RGB24"<<std::endl;
		exit(1);
	}
	
	const XnDepthPixel* pDepth=pDepthMap;
	const XnUInt8* pImage=pImageMap;
	
	XnDepthPixel zMax = depthMD.ZRes();
    //convert float buffer to unsigned short
	for ( unsigned int i=0; i<(depthMD.XRes() * depthMD.YRes()); ++i )
    {
            *(_depthBufferByte + i) = 255 * (float(*(pDepth + i)) / float(zMax));
    }

	memcpy(_videoStreamList[0]->data(),pImage, _videoStreamList[0]->getImageSizeInBytes());
	
	memcpy(_videoStreamList[1]->data(),_depthBufferByte, _videoStreamList[1]->getImageSizeInBytes());

	//3. don't forget to call this to notify the rest of the application
	//that you have a new video image
	_videoStreamList[0]->dirty();
	_videoStreamList[1]->dirty();
	}

	//4. hopefully report some interesting data
	if (nv) {

		const osg::FrameStamp *framestamp = nv->getFrameStamp();

		if (framestamp && _stats.valid())
		{
			_stats->setAttribute(framestamp->getFrameNumber(),
				"Capture time taken", t.time_m());
		}
	}


	// Increase modified count every X ms to ensure tracker updates
	if (updateTimer.time_m() > 50) {
		_videoStreamList[0]->dirty();
		_videoStreamList[1]->dirty();
		updateTimer.setStartTick();
	}

	return true;
}