Extending XFixes Extension

Roland Mainz roland.mainz at nrubsig.org
Thu Nov 4 12:45:26 PST 2004

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.

> 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).

Erm... that may cause serious problems for other implemenations. Please
don't do that. Originally the XC-APPGROUP extension was thoght for such



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