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[cairo-slope] Make comparison stable if both vectors are zero

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This commit is contained in:
Behdad Esfahbod 2007-03-09 16:23:35 -05:00
parent 9eee167210
commit 6976ab1392
1 changed files with 7 additions and 1 deletions
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8
src/cairo-slope.c
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@ -51,7 +51,7 @@ _cairo_slope_init (cairo_slope_t *slope, cairo_point_t *a, cairo_point_t *b)
difference between a and b is less than PI.
< 0 => a less positive than b
== 0 => a equal to be
== 0 => a equal to b
> 0 => a more positive than b
*/
int
@ -67,6 +67,12 @@ _cairo_slope_compare (cairo_slope_t *a, cairo_slope_t *b)
if (diff < 0)
return -1;
/* special-case zero vectors. the intended logic here is:
* zero vectors all compare equal, and more positive than any
* non-zero vector.
*/
if (a->dx == 0 && a->dy == 0 && b->dx == 0 && b->dy ==0)
return 0;
if (a->dx == 0 && a->dy == 0)
return 1;
if (b->dx == 0 && b->dy ==0)