mirror of https://github.com/golang/go.git
8b624f607f
To be clear, this supports decoding the bytes on the wire into an in-memory image. There is no API change: jpeg.Decode will still not return until the entire image is decoded. The code is obviously more complicated, and costs around 10% in performance on baseline JPEGs. The processSOS code could be cleaned up a bit, and maybe some of that loss can be reclaimed, but I'll leave that for follow-up CLs, to keep the diff for this one as small as possible. Before: BenchmarkDecode 1000 2855637 ns/op 21.64 MB/s After: BenchmarkDecodeBaseline 500 3178960 ns/op 19.44 MB/s BenchmarkDecodeProgressive 500 4082640 ns/op 15.14 MB/s Fixes #3976. The test data was generated by: # Create intermediate files; cjpeg on Ubuntu 10.04 can't read PNG. convert video-001.png video-001.bmp convert video-005.gray.png video-005.gray.pgm # Create new test files. cjpeg -quality 100 -sample 1x1,1x1,1x1 -progressive video-001.bmp > video-001.progressive.jpeg cjpeg -quality 50 -sample 2x2,1x1,1x1 video-001.bmp > video-001.q50.420.jpeg cjpeg -quality 50 -sample 2x1,1x1,1x1 video-001.bmp > video-001.q50.422.jpeg cjpeg -quality 50 -sample 1x1,1x1,1x1 video-001.bmp > video-001.q50.444.jpeg cjpeg -quality 50 -sample 2x2,1x1,1x1 -progressive video-001.bmp > video-001.q50.420.progressive.jpeg cjpeg -quality 50 -sample 2x1,1x1,1x1 -progressive video-001.bmp > video-001.q50.422.progressive.jpeg cjpeg -quality 50 -sample 1x1,1x1,1x1 -progressive video-001.bmp > video-001.q50.444.progressive.jpeg cjpeg -quality 50 video-005.gray.pgm > video-005.gray.q50.jpeg cjpeg -quality 50 -progressive video-005.gray.pgm > video-005.gray.q50.progressive.jpeg # Delete intermediate files. rm video-001.bmp video-005.gray.pgm R=r CC=golang-dev https://golang.org/cl/6684046 |
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| AUTHORS | ||
| CONTRIBUTORS | ||
| LICENSE | ||
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| README | ||
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README
This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.
After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.
Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README). You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See doc/install.html for more details.