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b6dc23370d
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>