[PATCH] glamor: Wire alpha to 1 for pictures without alpha bits

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> When sourcing a picture that has no alpha values, make sure any
> texture fetches wire the alpha value to one. This ensures that bits
> beyond the depth of the pixmap, or bits other than the RGB values
> aren't used.

Reviewed-by: Eric Anholt <eric at anholt.net>

I've pulled this to glamor-fixes, and updated my rendercheck testcase to
reproduce on master using GXinvert.
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