[cairo] [PATCH] Updates for the scaling test and more fixes

[Siarhei Siamashka]

Hello,

Now the test provides a bit better coverage of pixman functionality. Surely it
does not provide full guarantee and some bugs still may get through. But at
least passing this test should be mandatory for all the fastpath code.

It discovered one more problem with zero source alpha handling in OVER
operation fastpath functions (a fix is also attached).

-- 
Best regards,
Siarhei Siamashka
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