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c35a1ecb6c
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3 Commits

Author SHA1 Message Date
Benny Siegert
c35a1ecb6c go.image/tiff: use optimized routines for RGBA and NRGBA 
Performance for an RGBA image:

benchmark          old ns/op    new ns/op    delta
BenchmarkEncode      1633495         7897  -99.52%

benchmark           old MB/s     new MB/s  speedup
BenchmarkEncode        37.83      7824.96  206.85x

NRGBA images are now encoded as such, the spec calls it
"unassociated alpha".

R=nigeltao, rsc
CC=golang-dev
https://golang.org/cl/6308049
 2012-06-13 10:40:38 +10:00
Benny Siegert
de792da79c go.image/tiff: add a benchmark for the encoder 
The idea is to see whether it is worthwhile to implement special cases.

On my Mac Book Pro:

BenchmarkEncode	    1000	   1689656 ns/op	  36.69 MB/s

R=nigeltao, minux.ma
CC=golang-dev
https://golang.org/cl/6278050
 2012-06-07 09:41:24 +10:00
Benny Siegert
f594c3aad5 go.image/tiff: initial support for writing TIFF images 
The basic functionality works. Features to add in future CLs:

- compression
- fast paths for image formats that can be directly expressed in TIFF,
  such as RGBA, NRGBA and maybe Gray and Paletted.

R=nigeltao
CC=golang-dev
https://golang.org/cl/5694051
 2012-03-05 11:45:47 +11:00