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doc: document behavior change in image/color in release notes

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Change-Id: I7ad90ab78abb8a39d56c837610d5c311a96b7039
Reviewed-on: https://go-review.googlesource.com/12162
Reviewed-by: Nigel Tao <nigeltao@golang.org>
This commit is contained in:
Rob Pike 2015-07-14 15:20:19 +10:00
parent a74d030557
commit 902345e596
1 changed files with 30 additions and 7 deletions
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doc/go1.5.html
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@ -197,7 +197,7 @@ In prior releases it defaulted to 1.
Programs that do not expect to run with multiple cores may
break inadvertently.
They can be updated by removing the restriction or by setting
<code>GOMAXPROCS</code> explicitly.
<code>GOMAXPROCS</code> explicitly.
</p>
<h3 id="build">Build</h3>
@ -334,7 +334,7 @@ configure the architecture and operating system.
Unlike the other programs, the assembler is a wholly new program
written in Go.
</p>
<p>
The new assembler is very nearly compatible with the previous
ones, but there are a few changes that may affect some
@ -479,7 +479,7 @@ as described above.
<li>
An <code>-asmflags</code> build option has been added to provide
flags to the assembler.
However,
However,
the <code>-ccflags</code> build option has been dropped;
it was specific to the old, now deleted C compiler .
</li>
@ -585,7 +585,7 @@ and associated <a href="https://www.youtube.com/watch?v=cF1zJYkBW4A">video</a>.
<p>
The flag package's
<a href="/pkg/flag/#PrintDefaults"><code>PrintDefaults</code></a>
<a href="/pkg/flag/#PrintDefaults"><code>PrintDefaults</code></a>
function, and method on <a href="/pkg/flag/#FlagSet"><code>FlagSet</code></a>,
have been modified to create nicer usage messages.
The format has been changed to be more human-friendly and in the usage
@ -814,7 +814,7 @@ to select a certificate for the connection when none is supplied.
Finally, the session ticket keys in the
<a href="/pkg/crypto/tls/"><code>crypto/tls</code></a> package
can now be rotated (changed periodically during an active connection).
This is done through the new
This is done through the new
<a href="/pkg/crypto/tls/#Config.SetSessionTicketKeys"><code>SetSessionTicketKeys</code></a>
method of the
<a href="/pkg/crypto/tls/#Config"><code>Config</code></a> type.
@ -931,6 +931,29 @@ the <a href="/pkg/image/color/#CMYKModel"><code>CMYKModel</code></a> color model
needed by some JPEG images.
</li>
<li>
Also in the <a href="/pkg/image/color/"><code>image/color</code></a> package,
the conversion of a <a href="/pkg/image/color/#YCbCr"><code>YCbCr</code></a>
value to <code>RGBA</code> has become more precise.
Previously, the low 8 bits were just an echo of the high 8 bits;
now they contain more accurate information.
Because of the echo property of the old code, the operation
<code>uint8(r)</code> to extract an 8-bit red vaue worked, but is incorrect.
In Go 1.5, that operation may yield a different value.
The correct code is, and always was, to select the high 8 bits:
<code>uint8(r&gt;&gt;8)</code>.
Incidentally, <code>image/draw</code> package
provides better support for such conversions; see
<a href="https://blog.golang.org/go-imagedraw-package">this blog post</a>
for more information.
</li>
<li>
Finally, as of Go 1.5 the closest match check in
<a href="/pkg/image/color/#Palette.Index"><code>Index</code></a>
now honors the alpha channel.
</li>
<li>
The <a href="/pkg/image/gif/"><code>image/gif</code></a> package
includes a couple of generalizations.
@ -996,7 +1019,7 @@ Go 1.5's <a href="/pkg/net/"><code>net</code></a> package
adds RFC-6555-compliant dialing for sites with multiple TCP
addresses listed in DNS.
A new <code>DualStack</code> field
in <a href="/pkg/net/#Dialer"><code>Dialer</code></a> enables the feature.
in <a href="/pkg/net/#Dialer"><code>Dialer</code></a> enables the feature.
</li>
<li>
@ -1141,7 +1164,7 @@ The default, which can now be overridden, is as before: to continue with an inva
<li>
The <a href="/pkg/time/"><code>time</code></a> package's
<code>Time</code> type has a new method
<a href="/pkg/time/#Time.AppendFormat"><code>AppendFormat</code></a>,
<a href="/pkg/time/#Time.AppendFormat"><code>AppendFormat</code></a>,
which can be used to avoid allocation when printing a time value.
</li>