[cairo] infinite loop when CAIRO_FIXED_FRAC_BITS is 8

[Carl Worth]

On Thu, 14 Feb 2008 18:27:20 -0500, Behdad Esfahbod wrote:
> > consistently, (though my analysis was probably too shallow).
> >
> > And for what it's worth, we *don't* call qsort with this comparison
> > function.
>
> We do, by way of _cairo_hull_vertex_compare().  I checked ;).

OK, so change "probably" above to "definitely". I blew this one.

And I'm glad I asked for review. Thanks for saving me on this one,
Behdad!

> I'd go with something like: "To break ties when comparing slope vectors
> with exactly pi angular difference, the vector with a positive dx (or
> positive dy if dx's are zero) is considered ..."

Perfect. I'll go with that.

-Carl
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