[cairo] Patch for comparing doubles against exact values
cairo at antoineazar.com
Fri Feb 1 18:56:22 PST 2008
here's a patch that fixes a "bug" where we'd compare double values
with == 0. or == 1.
We already had a macro NEARLY_ZERO that compared a value with +/-
1/65536, I renamed it to IS_NEARLY_ZERO and added another one
IS_EQUAL_TO to compare to any value.
I encountered this bug when out of laziness, I scaled my
transformation matrix by 10, then reset it by scaling by 1/10
(instead of using get/set functions). That resulted in 0.99999 values
in the matrix instead of 1, and made the difference between going the
pixman route or the win32 route (and a 3x performance difference).
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