[cairo] Possible A8 Compositing Bug

[Jeremy Moles]

On Fri, 2010-09-17 at 13:38 -0400, Jeremy Moles wrote:
> I have attached a very small C application (~15 lines of code)
> demonstrating what I believe to be a bug in CAIRO_FORMAT_A8 when using
> the CLEAR operator. It only appears to be clearing those areas in DEST
> where SRC's alpha isn't full intensity (if that terminology makes any
> sense :)).
> 
> The bug exists in 1.10 at least, but NOT in the versions of cairo
> provided by Ubuntu 10.04 and Fedora 13 by default.
> 
> 
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Has anyone had a chance to look at this? Or alternatively, if anyone can
tell me whereabouts in the code I should start looking, I'd be glad to
have a shot at fixing it myself.