[cairo] Possible A8 Compositing Bug

[Jeremy Moles]

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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