[vtkusers] Not closing connection on X

[Joey Mukherjee]

Hello!

I have found a strange bug with VTK and X.  Here is an excerpt from 
vtkXRenderWindowInteractor.cxx:

  this->DisplayId = ren->GetDisplayId();
  if (!this->DisplayId)
    {
    vtkDebugMacro("opening display");
    this->DisplayId =
      XtOpenDisplay(this->App,NULL,"VTK","vtk",NULL,0,&argc,NULL);
    vtkDebugMacro("opened display");
    }
  else
    {
    // if there is no parent widget
    if (!this->top)
      {
      XtDisplayInitialize(this->App,this->DisplayId,
                          "VTK","vtk",NULL,0,&argc,NULL);
      }
    }

  // get the info we need from the RenderingWindow
  ren->SetDisplayId(this->DisplayId);

The first line is ren->GetDisplayId () which will create a connection to the 
display with XOpenDisplay.  This will set an internal variable "OwnDisplay" to 1 
since it created it.

The last line sets the DisplayId to the newly created DisplayId which will cause 
it to reset the OwnDisplay to 0 so the connection never gets closed.  This will 
cause an error after around 38 draws since it will run out of connections.

Any X gurus know how to solve this one?  I worked on it for a while and it isn't 
as simple as closing the connection since forcing it to close seems to cause 
other problems.

I have my own GUI which I use and then I let VTK create its own window for all 
its rendering.  I am not embedding the rendering window which is why I think 
this is causing a problem for me.  If I were to embed in my own GUI, I think 
everything would be fine, but what I'm doing is "legal", isn't it?

Thanks for any advice!

Joey

+--------------------------------------------------------------------------+
+                                                                          +
+     Joey Mukherjee                 "The price of freedom is eternal      +
+     joey at swri.org                   vigilance, or $12.50 as seen on      +
+                                     E-Bay...                             +
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