[cairo] Optimize horizontal/vertical gradients

[Keith Packard]

Around 23 o'clock on Feb 13, Owen Taylor wrote:

+	} else if (pattern->u.linear.point0.x == pattern->u.linear.point1.x) {
+	  height = 1;

Are you sure this one is right?

(and yes, we should probably have some general 'near' function that tests the 
equivalence of two doubles too).

-keith


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