Commit Graph

167 Commits

Author SHA1 Message Date
ChaiShushan
de306d5329 go.image/tiff: decoder support tiled tiff format
Use these commands to generate testdata:
tiffcp -s -r 64 video-001.tiff video-001-strip-64.tiff
tiffcp -t -l 64 -w 64 video-001.tiff video-001-tile-64x64.tiff

R=golang-dev, nigeltao, bsiegert
CC=golang-dev
https://golang.org/cl/13453043
2013-09-06 20:07:58 +10:00
ChaiShushan
822abc7ef1 go.image/tiff: add missing encoder to pkg doc
R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/13302045
2013-09-02 13:29:55 +10:00
Benny Siegert
26936f5590 go.image/tiff: Support reading 16-bit gray images.
Fixes golang/go#5866.

R=nigeltao
CC=golang-dev
https://golang.org/cl/11920043
2013-07-30 15:02:33 +10:00
Benny Siegert
d165204442 go.image/tiff: support for writing compressed images.
Only Deflate compression is supported for now.

R=nigeltao, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/6866051
2012-12-12 13:24:12 +11:00
Benny Siegert
41cf08abcf tiff: support writing files with differencing predictor.
This will make more sense after implementing compression.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6567077
2012-10-03 10:11:21 +10:00
Benny Siegert
5198c64fc9 tiff: new Options parameter for Encode.
No functional change at the moment but it will allow choosing
the compression type.

This is an incompatible, user-visible change. To get the old
behavior, callers of tiff.Encode need to add ", nil" as the
last parameter.

R=nigeltao
CC=golang-dev
https://golang.org/cl/6479044
2012-08-23 20:16:03 +10:00
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
Nigel Tao
2b631034c7 go.image: add PATENTS file to the subrepo.
R=r
CC=golang-dev
https://golang.org/cl/6024044
2012-04-16 11:25:02 +10:00
Rob Pike
2393f5daa3 LICENSE: add
R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5847054
2012-03-17 15:20:31 +11:00
Benny Siegert
27e7e9451c go.image/bmp: fix warnings from go vet
reader.go:138:10: image.Config struct literal uses untagged fields
reader.go:144:10: image.Config struct literal uses untagged fields

R=nigeltao
CC=golang-dev
https://golang.org/cl/5825047
2012-03-15 09:44:37 +11:00
Nigel Tao
20e9620e99 go.image/tiff: simplify encoding.
R=bsiegert
CC=golang-dev
https://golang.org/cl/5738044
2012-03-07 10:32:33 +11:00
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
Benny Siegert
324e6dabf0 go.image/tiff: optimize reading uncompressed files from a tiff.buffer.
In case the image is read via a tiff.buffer, avoid copying the
data strip before decoding it. Remove corresponding TODO.
Speeds up reading uncompressed images (which is the common case)
and uses much less memory.

benchmark                      old ns/op    new ns/op    delta
BenchmarkDecodeCompressed        4619438      4630774   +0.25%
BenchmarkDecodeUncompressed       260809       219875  -15.70%

R=nigeltao
CC=golang-dev
https://golang.org/cl/5683050
2012-02-21 11:25:19 +11:00
Nigel Tao
996c335c4a go.image/{bmp,tiff}: move tiff/testdata to testdata.
Add a "compare to golden PNG" test for BMP and TIFF.

R=rsc
CC=golang-dev
https://golang.org/cl/5601054
2012-01-31 14:02:27 +11:00
Nigel Tao
cc3e6234e7 go.image: initial code.
Manual edits to README.
Moved from main Go repository, deleted Makefiles.

Tested with go test code.google.com/p/go.image/...

Fixes golang/go#2797.

R=rsc, rsc, r
CC=golang-dev
https://golang.org/cl/5593053
2012-01-31 11:32:50 +11:00
Russ Cox
f61fbb80d2 go.empty: prototype for new subrepository
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5572056
2012-01-25 14:45:13 -05:00