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
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