Asynchronous Loading of images in gtkmm

Question

Currently, in my project, we are using gtkmm pixbuf create_from_file or create_from_date which hangs up whole GUI for 1-2 seconds in case of high-resolution images and in case of loading multiple images for a screen it becomes awfully slow. Is it possible to load images asynchronously in gtkmm for the above two functions? I am able to find methods in gtk for loading images asynchronously but not in gtkmm. An example would be helpful since I am unable to find anything related to it.

  if(!imageName.empty())
  {
    //Load image in pixbuf
    picPixBuff = Gdk::Pixbuf::create_from_file(imageName);

    picPixBuff = picPixBuff->scale_simple(150,35,Gdk::INTERP_BILINEAR);

   }

I have gone through this. Related Question - How to load a widget as a different thread in gtk? (vala)

Answer 1

There are docs for that. That example does exactly what you are asking for.

These are the functions that do the magic. The example is easy to follow.

// notify() is called from ExampleWorker::do_work(). It is executed in the worker
// thread. It triggers a call to on_notification_from_worker_thread(), which is
// executed in the GUI thread.
void ExampleWindow::notify()
{
  m_Dispatcher.emit();
}

void ExampleWindow::on_notification_from_worker_thread()
{
  if (m_WorkerThread && m_Worker.has_stopped())
  {
    // Work is done.
    if (m_WorkerThread->joinable())
      m_WorkerThread->join();
    delete m_WorkerThread;
    m_WorkerThread = nullptr;
    update_start_stop_buttons();
  }
  update_widgets();
}