ppc: swscale: rework yuv2planeX_altivec()
This gets rid of the variable-length scratch buffer by filtering 16
pixels at a time and writing directly to the destination. The extra
loads this requires to load the source values are compensated by not
doing a round-trip to memory before shifting.
Signed-off-by:
Mans Rullgard <mans@mansr.com>
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