[cairo] Horizontal artifacts rendering to an image surface

[Søren Sandmann]

Floyd May <FMay at sstsoftware.com> writes:

> I've been able to boil this down to a reproducible, small case.
> Basically, two four-point polygons where one edge from each is
> collinear.  Using even-odd rendering, I'm getting these artifacts:
>
> http://imagebin.org/222354
>
> Again, this is based on v 1.10.2, on Windows (both x86 and x64 exhibit
> the issue), based on a recent download of GTK+ binaries.
>
> Here is C# source (using Mono.Cairo; should be able to adapt to C code
> relatively easily):

FWIW, here is a C variant that shows the same artefact and also
demonstrates that it doesn't happen with the X backend. (To use the X
backend, set the "const int image" variable to 0).


Soren

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