commit 8c8381d5439b0caedec42261d32724612cef7f3e
author Jingning Han <jingning@google.com> Wed Oct 30 13:52:55 2013 -0700
committer Jingning Han <jingning@google.com> Wed Oct 30 14:01:06 2013 -0700
tree 50e294a8b0feff528d1de41a087ce08b6b54da7a
parent 50c4026e93e0826194ec7e3bd62019a3ff6fe0ef

Enable all-zero coeff block index for sub8x8 blk

This commit makes zcoeff_blk cache the case where the entire block
is quantized to be zero (without applying zero-forcing) in the rate-
distortion optimization loop, and skip the forward DCT, quantization,
inverse DCT, and reconstruction process in the encode_block stage.

It now works for all the block sizes, including sub8x8 blocks.

Change-Id: I5ae60a9c436ba3637d11666733554bec4580ef98