[cairo] strange trapezoid produced by cairo
M Joonas Pihlaja
jpihlaja at cc.helsinki.fi
Sun Jun 1 05:53:15 PDT 2008
On Wed, 28 May 2008, kammal wrote:
[snip unantialiased-shapes test produces a self-intersecting
> Is this a valid trapezoid?
> Is this a bug in cairo, or I am not taking care of something?
It's a bug in cairo's tessellator which appears to affect some
rightmost trapezoids which self-intersect -- they're not emitted
soon enough at the intersection point. The bug seems to be
masked when rasterising because pixman doesn't render backward
spans and stops when it detects the intersection.
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