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weekly.2011-07-19
R=golang-dev, nigeltao, dsymonds, r CC=golang-dev https://golang.org/cl/4801042
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Andrew Gerrand
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48d1240e51
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50ddb98b24
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.hgtags
1
.hgtags
@ -70,6 +70,5 @@ dac76f0b1a18a5de5b54a1dc0b231aceaf1c8583 weekly.2011-06-16
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541c445d6c1353fbfa39df7dc4b0eb27558d1fc1 weekly.2011-06-23
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1b38d90eebcddefabb3901c5bb63c7e2b04a6ec5 release.r58
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16bfa562ba767aefd82e598da8b15ee4729e23b0 weekly.2011-07-07
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16bfa562ba767aefd82e598da8b15ee4729e23b0 weekly
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d292bc7886682d35bb391bf572be28656baee12d release.r58.1
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d292bc7886682d35bb391bf572be28656baee12d release
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@ -14,6 +14,123 @@ hg pull
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hg update weekly.<i>YYYY-MM-DD</i>
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</pre>
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<h2 id="2011-07-19">2011-07-19</h2>
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<pre>
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This weekly snapshot includes a language change and a change to the image
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package that may require changes to client code.
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The language change is that an "else" block is now required to have braces
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except if the body of the "else" is another "if". Since gofmt always puts those
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braces in anyway, programs will not be affected unless they contain "else for",
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"else switch", or "else select". Run gofmt to fix any such programs.
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The image package has had significant changes made to the Pix field of struct
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types such as image.RGBA and image.NRGBA. The image.Image interface type has
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not changed, though, and you should not need to change your code if you don't
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explicitly refer to Pix fields. For example, if you decode a number of images
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using the image/jpeg package, compose them using image/draw, and then encode
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the result using image/png, then your code should still work as before.
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If you do explicitly refer to Pix fields, there are two changes. First, Pix[0]
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now refers to the pixel at Bounds().Min instead of the pixel at (0, 0). Second,
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the element type of the Pix slice is now uint8 instead of image.FooColor. For
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example, for an image.RGBA, the channel values will be packed R, G, B, A, R, G,
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B, A, etc. For 16-bits-per-channel color types, the pixel data will be stored
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as big-endian uint8s.
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Most Pix field types have changed, and so if your code still compiles after
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this change, then you probably don't need to make any further changes (unless
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you use an image.Paletted's Pix field). If you do get compiler errors, code
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that used to look like this:
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// Get the R, G, B, A values for the pixel at (x, y).
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var m *image.RGBA = loadAnImage()
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c := m.Pix[y*m.Stride + x]
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r, g, b, a := c.R, c.G, c.B, c.A
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should now look like this:
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// Get the R, G, B, A values for the pixel at (x, y).
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var m *image.RGBA = loadAnImage()
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i := (y-m.Rect.Min.Y)*m.Stride + (x-m.Rect.Min.X)*4
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r := m.Pix[i+0]
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g := m.Pix[i+1]
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b := m.Pix[i+2]
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a := m.Pix[i+3]
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This image package change will not be fixed by gofix: how best to translate
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code into something efficient and idiomatic depends on the surrounding context,
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and is not easily automatable. Examples of what to do can be found in the
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changes to image/draw/draw.go in http://codereview.appspot.com/4675076/
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Other changes:
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* 6l: change default output name to 6.out.exe on windows (thanks Alex Brainman).
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* archive/zip: add Writer,
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add Mtime_ns function to get modified time in sensible format.
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* cc, ld, gc: fixes for Plan 9 build (thanks Lucio De Re).
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* cgi: close stdout reader pipe when finished.
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* cgo: add missing semicolon in generated struct,
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windows amd64 port (thanks Wei Guangjing).
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* codereview: fix for Mercurial 1.9.
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* dashboard: list "most installed this week" with rolling count.
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* debug/elf: read ELF Program headers (thanks Matthew Horsnell).
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* debug/pe: fixes ImportedSymbols for Win64 (thanks Wei Guangjing).
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* debug/proc: remove unused package.
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* doc/talks/io2010: update with gofix and handle the errors.
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* exp/eval, exp/ogle: remove packages eval and ogle.
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* exp/regexp/syntax: add Prog.NumCap.
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* exp/template: API changes, bug fixes, and tweaks.
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* flag: make -help nicer.
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* fmt: Scan(&int) was mishandling a lone digit.
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* gc: fix closure bug,
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fix to build with clang (thanks Dave Cheney),
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make size of struct{} and [0]byte 0 bytes (thanks Robert Hencke),
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some enhancements to printing debug info.
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* gif: fix local color map and coordinates.
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* go/build: fixes for windows (thanks Alex Brainman),
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include processing of .c files for cgo packages (thanks Alex Brainman),
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less aggressive failure when GOROOT not found.
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* go/printer: changed max. number of newlines from 3 to 2.
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* gob: register more slice types (thanks Bobby Powers).
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* godoc: support for file systems stored in .zip files.
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* goinstall, dashboard: Google Code now supports git (thanks Tarmigan Casebolt).
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* hash/crc32: add SSE4.2 support.
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* html: update section references in comments to the latest HTML5 spec.
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* http: drain the pipe output in TestHandlerPanic to avoid logging deadlock,
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fix Content-Type of file extension (thanks Yasuhiro Matsumoto),
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implement http.FileSystem for zip files,
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let FileServer work when path doesn't begin with a slash,
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support for periodic flushing in ReverseProxy.
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* image/draw: add benchmarks.
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* json: add omitempty struct tag option,
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allow using '$' and '-' as the struct field's tag (thanks Mikio Hara),
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encode \r and \n in strings as e.g. "\n", not "\u000A" (thanks Evan Martin),
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escape < and > in any JSON string for XSS prevention.
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* ld: allow seek within write buffer<
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add a PT_LOAD PHDR entry for the PHDR (thanks David Anderson).
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* net: windows/amd64 port (thanks Wei Guangjing).
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* os: plan9: add Process.Signal as a way to send notes (thanks Yuval Pavel Zholkover).
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* os: don't permit Process.Signal after a successful Wait.
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* path/filepath: fixes for windows paths (thanks Alex Brainman).
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* reflect: add Value.NumMethod,
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panic if Method index is out of range for a type.
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* runtime: faster entersyscall, exitsyscall,
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fix panic for make(chan [0]byte),
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fix subtle select bug (thanks Hector Chu),
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make goc2c build on Plan 9 (thanks Lucio De Re),
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make TestSideEffectOrder work twice,
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several parallelism-related optimizations and fixes,
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stdcall_raw stack 16byte align for Win64 (thanks Wei Guangjing),
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string-related optimizations (thanks Quan Yong Zhai),
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track running goroutine count.
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* strconv: handle [-+]Infinity in atof.
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* sync: add fast paths to WaitGroup,
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improve RWMutex performance.
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* syscall: add Flock on Linux,
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parse and encode SCM_RIGHTS and SCM_CREDENTIALS (thanks Albert Strasheim).
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</pre>
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<h2 id="2011-07-07">2011-07-07</h2>
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<pre>
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