Method do_start

src/laybasic/laybasic/layRedrawThread.cc:209–342

}

void 
RedrawThread::do_start (bool clear, const db::Vector *shift_vector, const std::vector <lay::RedrawLayerInfo> *layers, const std::vector<int> &restart, int nworkers)
{
  // change the number of workers if required.
  if (nworkers >= 0 && nworkers != num_workers ()) {
    set_num_workers (nworkers);
  }

  m_initial_update = true;

  //  We need this recursion sentinel because start may be called recursively
  //  via Layout::update which may open a progress widget and do processEvents.
  //  This may result in a repaint for example issuing a "start" call.
  //  Recursion however is forbidden because of the deadlocking locks used originally
  //  to lock out the redraw thread.
  if (m_start_recursion_sentinel) {
    return;
  }
  m_start_recursion_sentinel = true;

  {
    if (tl::verbosity () >= 40) {
      tl::info << tl::to_string (tr ("Preparing to draw"));
    }
    tl::SelfTimer timer (tl::verbosity () >= 41, tl::to_string (tr ("Preparing to draw")));

    //  detach from all layout objects 
    tl::Object::detach_from_all_events ();

    //  Update all relevant layout objects.
    for (unsigned int i = 0; i < mp_view->cellviews (); ++i) {
      const lay::CellView &cv = mp_view->cellview (i);
      if (cv.is_valid () && ! cv->layout ().under_construction () && ! (cv->layout ().manager () && cv->layout ().manager ()->transacting ())) {
        cv->layout ().update ();
        //  attach to the layout object to receive change notifications to stop the redraw thread
        cv->layout ().hier_changed_event.add (this, &RedrawThread::layout_changed);
        cv->layout ().bboxes_changed_any_event.add (this, &RedrawThread::layout_changed);
      }
    }
    mp_view->annotation_shapes ().update ();
    //  attach to the layout object to receive change notifications to stop the redraw thread
    mp_view->annotation_shapes ().hier_changed_event.add (this, &RedrawThread::layout_changed);  //  not really required, since the shapes have no hierarchy, but for completeness ..
    mp_view->annotation_shapes ().bboxes_changed_any_event.add (this, &RedrawThread::layout_changed);
    mp_view->cellviews_about_to_change_event.add (this, &RedrawThread::layout_changed);
    mp_view->cellview_about_to_change_event.add (this, &RedrawThread::layout_changed_with_int);

    m_initial_update = true;

    if (clear) {
      m_layers = *layers;
    }

    m_nlayers = int (m_layers.size ());

    if (mp_view->cellviews () > 0) {

      if (clear) {