[cairo] Optimize horizontal/vertical gradients

[Owen Taylor]

Quick 30 second thought that makes a big difference for pure
vertical/horizontal gradients. It's possible that there should
be some epsilon in the tests, to handle round-off errors in
90 degree rotations and the like, maybe something like

  fabs (p2.x - p1.x) < EPSILON * fabs (p2.y - p1.y)

?

Regards,
					Owen

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