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hull: _cairo_hull_vertex_compare() return 0 for identical elements

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Andreas Falkenhahn reported a bizarre situation with some
implementations of qsort that actually compare the same elements and
require the comparator to return 0. So be it.

Reported-by: Andreas Falkenhahn <andreas@airsoftsoftwair.de>
This commit is contained in:
Chris Wilson 2010-04-13 17:52:19 +01:00
parent d95037db99
commit 8afd4e4c3d
1 changed files with 7 additions and 0 deletions
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7
src/cairo-hull.c
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@ -95,6 +95,13 @@ _cairo_hull_vertex_compare (const void *av, const void *bv)
cairo_hull_t *b = (cairo_hull_t *) bv;
int ret;
/* Some libraries are reported to actually compare identical
* pointers and require the result to be 0. This is the crazy world we
* have to live in.
*/
if (a == b)
return 0;
ret = _cairo_slope_compare (&a->slope, &b->slope);
/*