[cairo] strange trapezoid produced by cairo

M Joonas Pihlaja jpihlaja at cc.helsinki.fi
Sun Jun 1 05:53:15 PDT 2008

Hi Kamaal,

On Wed, 28 May 2008, kammal wrote:

[snip unantialiased-shapes test produces a self-intersecting

> Is this a valid trapezoid?

No. :(

> 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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