[Cairo] Stroking problem

[Soorya Kuloor]

Hi Carl,

I just upgraded to Cairo from Xr, so that I can implement
cairo_surface_set_clip_region() function. However, in the process I have
found a bug. I am attaching a test program that reproduces the bug.

The test tries to draw a rectangle and then rotates it by approx. 90
degrees (note: not exactly 90 degrees, but pretty close). On my machine
it takes 5.8 secs to stroke this one rectangle. If I change the
transformation to exact 90 degrees the rectangle draws in less than a
millisecond as expected. 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. Unfortunately, I do not
understand the math in there. The problem does not happen if I fill the
rectangle, instead of stroking it.

Can you please help?

Thanks,
-- Soorya

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