Neil Roberts b6dc23370d Add a conformance test for reading back an RGBA texture as alpha-only
This just creates a 1x1 RGBA texture and then reads it back in
COGL_PIXEL_FORMAT_A_8 format. Gnome Shell is doing this to create a
shadow and I accidentally broke it so this should hopefully stop that
happening again.

https://bugzilla.gnome.org/show_bug.cgi?id=671016

Reviewed-by: Robert Bragg <robert@linux.intel.com>
2012-03-05 17:43:46 +00:00
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