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| -rw-r--r-- | doc/go1.5.html | 37 |
1 files changed, 30 insertions, 7 deletions
diff --git a/doc/go1.5.html b/doc/go1.5.html index 493209df1d..c54d4ce316 100644 --- a/doc/go1.5.html +++ b/doc/go1.5.html @@ -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. @@ -932,6 +932,29 @@ 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>>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. A multiple-frame GIF file can now have an overall bounds different @@ -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> |