tree 6c0d9e178458d818d0a13a82e47a44747f256b0e
parent 9dcbbe3d487626d9b8a8877ece66a2982730004e
author Yaowu Xu <yaowu@google.com> 1366740371 -0700
committer Yaowu Xu <yaowu@google.com> 1367273730 -0700

Use same intra prediction for all block size

The commmit changed to use same intra prediction function for all
block sizes.

Some details on the changes:
1. All directional modes except DC/TM/V/H now have built-in filtering
for all pixels with filter taps either (1, 2, 1)/4 or (1, 1)/2.
2. Above edge get automatic extended to double width (bw*2), which
makes a lot of the prediciton mode computation simpler.
3. Same intra prediction function is called with different size
for i4x4_pred and all other larger size.

Overall, the change helped keyframe only coding for both cif size
and std-hd size test sets by .5% consistently on all encodings.
For normal coding with single/auto key frame, the change now also
is consistently net positive for all encodings. The overall gains
is about .15% on std-hd set.

Change-Id: I01ceb31fbc73d49776262e6bdc06853b03bbd1d1