Listing 4. Private Rendering

void RtpRender::quePrivateRender(BBox& viewPort, 

    const QSize& bufSize)

{

  // Set to mark that private rendering is queued.

  _privateRenderQueued = true;

  _queuedViewPort = viewPort;

  _queuedSize = bufSize;

  // If the _timer is inactive, start the private 

  // rendering now.

  if (!(_timer.isActive()))

    switchToPrivate();

}