[cairo] Solving the self-intersecting stroke

[Carl Worth]

On Thu, 2008-10-02 at 10:25 +0100, Chris Wilson wrote:
> Carl, I've slept on it and acting upon Joonas's hint that we may have
> been performing the wrong operation in edge_x_for_y(), I've rewritten
> the comparison to perform the test directly upon the edge equations
> which simplifies the code greatly.

Very nice, Chris!

This was much easier to review, and quite lovely.

Thanks for the fixes and cleanups.

-Carl

PS. How are the results looking with this?