Kostya Shishkov 464e9ab011 lagarith: add YUY2 decoding support ...

Unlike other variants, for YUY2 we need to use different prediction:
* on line 0 for luma we should left predict starting from the second pixel
* on line 1 we should left predict first 4 pixels for luma and 2 for chroma
* median prediction employed here is taken directly from HuffYUV

2012-05-08 07:24:31 +02:00

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