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f8a86727c2
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3 Commits

Author SHA1 Message Date
Nigel Tao
f8a86727c2 go.image/vp8: remove the filter look-up tables. 
The benchmarks are a little slower, but the code is shorter.

benchmark                          old ns/op     new ns/op     delta
BenchmarkDecodeVP8SimpleFilter     621950        644184        +3.57%
BenchmarkDecodeVP8NormalFilter     4045745       4269431       +5.53%

LGTM=r
R=r, minux, ruiu
CC=golang-codereviews
https://golang.org/cl/108140045
 2014-06-27 09:14:15 +10:00
Nigel Tao
0424e74a0e go.image/vp8: implement the normal filter. 
The testdata was generated via:
cwebp foo.png -o foo.lossy.webp
dwebp -pgm foo.lossy.webp -o tmp.pgm
convert tmp.pgm foo.lossy.webp.ycbcr.png
rm tmp.pgm

TBR=r
R=r
CC=golang-codereviews
https://golang.org/cl/107330043
 2014-06-26 13:29:30 +10:00
Nigel Tao
72be9c51b1 go.image/vp8: implement the loop filter. 
The testdata files were created by:
cwebp video-001.png -o video-001.webp
dwebp -pgm video-001.webp -o tmp.pgm
convert tmp.pgm video-001.webp.ycbcr.png
rm tmp.pgm

LGTM=r
R=r
CC=chaishushan, golang-codereviews
https://golang.org/cl/91700044
 2014-05-27 10:52:02 +10:00