Extending XFixes Extension

[mcnichol at austin.ibm.com]

> From: Roland Mainz <roland.mainz at nrubsig.org>
> 
> Keith Packard wrote:
> > > The current Xserver does not give client the ability to query the server to
> > > ask it which window belongs to (to client).
> > 
> > While the specification doesn't guarantee the partitioning of the resource
> > ID space is the same for every client, the implementation happens to work
> > that way.  So, identifying windows belonging to the same client is as
> > simple as masking their IDs with the resource mask in the Display
> > structure.
> 
> This will only work with Xservers based on the X.org/Xfree86 codebase.
> Remember that there are other Xservers with a completely different
> codebase (for example: Weired/WiredX, which are written in JAVA or some
> of the MS-Windows Xserver products) which do not work that way.
> 

The X server is not responsible for assigning resource IDs other that providing
a "connection id" that Keith alluded to above.  The resource IDs are assigned
by libX11.  And though it has been a while since I last dug through the Xlib spec,
I seem to remember that this is clearly documented.


> > Formalizing that in the XFixes documentation would be reasonable (i.e., an
> > X server advertising a specific XFIXES version would guarantee that the
> > resource ID partitioning was the same for all clients).

Dan