[PATCH xserver] glamor: Disable logic ops when doing compositing

[Keith Packard]

Eric Anholt <eric at anholt.net> writes:

> Keith Packard <keithp at keithp.com> writes:
>
>> If the logic op gets left enabled, it overrides the blending
>> operation, causing incorrect contents on the display.
>>
>> Signed-off-by: Keith Packard <keithp at keithp.com>
>
> Reviewed-by: Eric Anholt <eric at anholt.net>

And it's actually wrong (sigh). Need to do this in all paths through
this function (even the PictOpSrc case), and we only want to do it on
non-ES2 flavors. Here's an updated version.

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-- 
-keith
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