Overlay windows and backwards compatibility

[Keith Packard]

On Thu, 2006-03-23 at 16:00 -0800, Deron Johnson wrote:

> However, I notice that the Xfixes client library performs this
> sort of version checking, converting unsupported routines into
> no-ops. But I notice that the Composite client library doesn't
> do any checking at all. When I added the new functions to the
> Xfixes client library I made sure that XFixesHide/ShowCursor checked
> the version number and simply returned if it wasn't 4.0 or greater.
> But I didn't do this in the Composite client library because
> version checking wasn't being done in any of the other functions.

XFixes is expected to change over time, Composite is not (although it
now has). Most extension libraries leave this kind of version checking
to applications, I'm afraid. I don't know what the best method should
be.

-- 
keith.packard at intel.com
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