Vikas Arora e1947a9299 Add Alpha encode/decode code.
Add code for Alpha encoding & decoding. The alpha compression is done
via backward reference counts encoded with Arithmetic encoder (TCoder).
Also provided is lossy Alpha pre-processing option via level-quantizations
using kNN heuristic.

Change-Id: Ib6b13530c1a4ab6493edcb586ad29fe242bc1766
2011-11-30 17:53:09 +05:30
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2011-11-23 19:03:13 +05:30
2011-11-30 17:53:09 +05:30
2011-11-23 19:03:13 +05:30
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