[cairo] [PATCH][pixman] C fast path function for 'over_n_1_0565'

[Siarhei Siamashka]

Hello,

This patch provides more than 2x performance improvement for this particular
case (terminal, bitmap font, 16bpp desktop color depth). Benchmarked on
ARM Cortex-A8.

Tested for correctness on both big and little endian systems.

-- 
Best regards,
Siarhei Siamashka
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