[Cairo] Stroking problem

[Keith Packard]

Around 12 o'clock on Jul 25, Soorya Kuloor wrote:

> I did a runtime profile and found that function
> _line_segs_intersect_ceil() in file cairo_traps.c goes into an almost
> infinite loop at the while loop at line 416.

Cool -- it didn't infinite loop.  We just rewrote that code to make sure 
it was correct and are doing a linear search at sub-pixel resolution.  
Changing that to a faster search should solve the performance problem.

Thanks for constructing a test case for this...

-keith