vpx/vp9/encoder
Linfeng Zhang afee58f2c4 Specialize 4 to 3 scaling in vp9_scale_and_extend_frame_c()
Scale 3x3 block instead of 16x16 block in each loop.

Benefits:
1. Reduced number of different phase_scaler from 16 to 3. Optimization code
   will be smaller and faster.
2. The maximum phase_scaler drifting will be reduced from 5/16 to 1/24.
   (The drifting is 1/(3*16) in each step.)

BUG=webm:1419

Change-Id: Ibb9242a629ddb03e1ff93b859bece738255e698c
2017-09-12 12:05:16 -07:00
..
2017-09-06 15:54:58 -07:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2017-02-16 13:20:32 -08:00
2017-08-21 09:49:04 -07:00
2016-08-02 16:47:11 -07:00
2017-08-14 14:27:53 -07:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2017-09-01 01:24:03 -07:00
2017-05-18 12:56:02 +01:00
2016-08-02 16:47:11 -07:00
2017-07-10 11:20:35 -07:00
2017-04-06 00:50:56 +00:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2017-09-01 01:24:03 -07:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2016-08-02 16:47:11 -07:00
2017-03-17 16:53:09 -07:00
2015-07-20 18:13:04 -07:00