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[slope] Replace open-coding 64bit integer arithmetic.

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Prefer to use the operations form cairo-wideint-private.h in order to
improve readability and reduce our assumptions on the availability of
64bit integers.
This commit is contained in:
Chris Wilson 2008-10-06 16:13:21 +01:00
parent 5e3fcb7934
commit c6a6bf580f
1 changed files with 6 additions and 8 deletions
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14
src/cairo-slope.c
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@ -66,15 +66,13 @@ _cairo_slope_init (cairo_slope_t *slope,
int
_cairo_slope_compare (const cairo_slope_t *a, const cairo_slope_t *b)
{
cairo_fixed_48_16_t diff;
cairo_int64_t ady_bdx = _cairo_int32x32_64_mul (a->dy, b->dx);
cairo_int64_t bdy_adx = _cairo_int32x32_64_mul (b->dy, a->dx);
int cmp;
diff = ((cairo_fixed_48_16_t) a->dy * (cairo_fixed_48_16_t) b->dx
- (cairo_fixed_48_16_t) b->dy * (cairo_fixed_48_16_t) a->dx);
if (diff > 0)
return 1;
if (diff < 0)
return -1;
cmp = _cairo_int64_cmp (ady_bdx, bdy_adx);
if (cmp)
return cmp;
/* special-case zero vectors. the intended logic here is:
* zero vectors all compare equal, and more positive than any