[cairo] strange trapezoid produced by cairo

[kammal]

>
> Hi,
>
> It's a little annoying I can't test for the bug using the client
> side API.  Filling is masked by pixman as mentioned before, and
> cairo_in_fill() doesn't expose it either.  Below is a patch that
> doesn't introduce failures in the test suite and fixes the wrong
> trap generation.
>
> The broken and fixed tessellations are visible here (flip through
> the pages, note the last trap in the broken version):
>
> http://www.discontinuity.info/~rowan/broke-star.ps
> http://www.discontinuity.info/~rowan/fixed-star.ps
>
> Joonas


We don't use pixman, and your patch does make a difference through the
cairo API.

http://kamalneet.googlepages.com/unantialiased-shapes-before.png
http://kamalneet.googlepages.com/unantialiased-shapes-after.png

Thanks a lot for the fix :-)

~kammal