[PATCH] glamor: swizzle RED to 0 for alpha textures.

[Keith Packard]

Keith Packard <keithp at keithp.com> writes:

> And, loading a page from gfycat is broken by this change.
>
> firefox https://gfycat.com/HoarseCheapAmericankestrel
>
> So, we can either have feedly with black text or gfycat with 
> cat videos, but not both at the same time. I'm not sure I can live in a
> world without both of these.

I just posted a fix for this which leaves bits in the Red channel when
the destination is also in GL_RED format.

-- 
-keith
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