[PATCH] render: Avoid infinite loops in alpha map handling (#23581)

[Adam Jackson]

On Mon, 2010-05-10 at 13:34 -0700, Keith Packard wrote:
> On Mon, 10 May 2010 15:34:53 -0400, Adam Jackson <ajax at redhat.com> wrote:
> > Don't allow setting the alpha map of a picture to itself, or to a
> > picture that already has an alpha map, to prevent cycles.
> > 
> > Signed-off-by: Adam Jackson <ajax at redhat.com>
> 
> I'd say that setting an alpha-map to a picture with an alpha-map should
> use that alpha-map, and setting alpha-map to itself should clear the
> alpha-map pointer.

That's also fair, and trivial.  I've updated the protocol spec to
reflect this; new xserver patch coming shortly.

- ajax
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