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c16cd99aba
Speedup lossless encoder by 20-25% by optimizing: - GetBestColorTransformForTile: Use techniques like binary search and local minima search to reduce the search space. - VP8LFastSLog2Slow & VP8LFastLog2Slow: Adding the correction factor for log(1 + x) and increase the threshold for calling the approximate version of log_2 (compared to costly call to log()). Change-Id: Ia2444c914521ac298492aafa458e617028fc2f9d