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The Go programming language
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dbcdce5866
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Nigel Tao dbcdce5866 image/png: optimize paeth some more. 
filterPaeth takes []byte arguments instead of byte arguments,
which avoids some redudant computation of the previous pixel
in the inner loop.

Also eliminate a bounds check in decoding the up filter.

benchmark                       old ns/op    new ns/op    delta
BenchmarkDecodeGray               3139636      2812531  -10.42%
BenchmarkDecodeNRGBAGradient     12341520     10971680  -11.10%
BenchmarkDecodeNRGBAOpaque       10740780      9612455  -10.51%
BenchmarkDecodePaletted           1819535      1818913   -0.03%
BenchmarkDecodeRGB                8974695      8178070   -8.88%

R=rsc
CC=golang-dev
https://golang.org/cl/6243061
2012-05-30 21:38:46 +10:00
api archive/tar: add FileInfoHeader function 2012-05-24 14:10:54 -07:00
doc spec: clarify evaluation order of "i, x[i] = range ..." 2012-05-24 10:59:48 -07:00
include build: remove unnecessary pragmas 2012-02-06 12:45:23 -05:00
lib codereview: support mercurial 2.2.1 2012-05-17 02:54:03 +08:00
misc Emacs go-mode: don't indent the inside of strings. 2012-05-29 16:30:06 -04:00
src image/png: optimize paeth some more. 2012-05-30 21:38:46 +10:00
test test/bench/shootout/timing.log: update after recent compiler changes 2012-05-29 11:01:50 -07:00
.hgignore build: update Makefile to track source code dependencies better 2012-03-13 03:31:11 +08:00
.hgtags re-tag go1.0.1 2012-04-26 12:51:55 -07:00
AUTHORS A+C: Peter Kleiweg (individual CLA) 2012-05-29 11:12:31 -04:00
CONTRIBUTORS A+C: Peter Kleiweg (individual CLA) 2012-05-29 11:12:31 -04:00
favicon.ico add a favicon plus a couple of hi-res versions of gordon 2009-10-26 10:13:07 -07:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README build: update, streamline documentation for new $GOBIN 2010-08-24 20:00:50 -04:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

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.