[PATCH] composite: only update window contents when using automatic redirection

[Brian J. Tarricone]

Hey Jesse,

On 09/07/2010 12:48 PM, Jesse Barnes wrote:
> Brian pointed this out awhile back but the fix was never merged.  So
> here's a real patch.  Would be nice to get into 1.9.x as well if it
> proves ok in master.

Thanks for picking this up again.  For what it's worth, we've been
running with this patch on an embedded ARM system for several months
with no problems.  Nothing out in the wild yet, but in-house it's been
working ok with xserver 1.6.5.

I haven't profiled in a while, but I recall that oprofile was showing
quite a bit less time in memcpy() with this patch.  The odd thing was
that I didn't see a measurable increase in framerate... but maybe that
had to do with something else stupid the app I was testing with was doing.

	-brian