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html5/spec Overview.html,1.2205,1.2206

From: Ian Hickson via cvs-syncmail <cvsmail@w3.org>
Date: Thu, 30 Apr 2009 23:01:13 +0000
To: public-html-commits@w3.org
Message-Id: <E1LzfFh-0007xs-S3@lionel-hutz.w3.org>
Update of /sources/public/html5/spec
In directory hutz:/tmp/cvs-serv30602

Modified Files:
	Overview.html 
Log Message:
createImageData() now also takes a single ImageData argument, so that you can get new ImageData objects of the same dimensions, for filters that need that kind of thing. (whatwg r3046)

Index: Overview.html
===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.2205
retrieving revision 1.2206
diff -u -d -r1.2205 -r1.2206
--- Overview.html	30 Apr 2009 22:53:56 -0000	1.2205
+++ Overview.html	30 Apr 2009 23:01:10 -0000	1.2206
@@ -19869,6 +19869,7 @@
 
   // pixel manipulation
   <a href="#imagedata">ImageData</a> <a href="#dom-context-2d-createimagedata" title="dom-context-2d-createImageData">createImageData</a>(in float sw, in float sh);
+  <a href="#imagedata">ImageData</a> <a href="#dom-context-2d-createimagedata" title="dom-context-2d-createImageData">createImageData</a>(in <a href="#imagedata">ImageData</a> imagedata);
   <a href="#imagedata">ImageData</a> <a href="#dom-context-2d-getimagedata" title="dom-context-2d-getImageData">getImageData</a>(in float sx, in float sy, in float sw, in float sh);
   void <a href="#dom-context-2d-putimagedata" title="dom-context-2d-putImageData">putImageData</a>(in <a href="#imagedata">ImageData</a> imagedata, in float dx, in float dy, [Optional] in float dirtyX, in float dirtyY, in float dirtyWidth, in float dirtyHeight);
 };
@@ -21850,6 +21851,19 @@
 
    </dd>
 
+   <dt><var title="">imagedata</var> = <var title="">context</var> . <code title="dom-context-2d-createImageData"><a href="#dom-context-2d-createimagedata">createImageData</a></code>(<var title="">imagedata</var>)</dt>
+
+   <dd>
+
+    <p>Returns an <code><a href="#imagedata">ImageData</a></code> object with the same
+    dimensions as the argument. All the pixels in the returned object
+    are transparent black.</p>
+
+    <p>Throws a <code><a href="#not_supported_err">NOT_SUPPORTED_ERR</a></code> exception if the
+    argument is null.</p>
+
+   </dd>
+
    <dt><var title="">imagedata</var> = <var title="">context</var> . <code title="dom-context-2d-getImageData"><a href="#dom-context-2d-getimagedata">getImageData</a></code>(<var title="">sx</var>, <var title="">sy</var>, <var title="">sw</var>, <var title="">sh</var>)</dt>
 
    <dd>
@@ -21898,11 +21912,16 @@
 
   </dl><div class="impl">
 
-  <p>The <dfn id="dom-context-2d-createimagedata" title="dom-context-2d-createImageData"><code>createImageData(<var title="">sw</var>, <var title="">sh</var>)</code></dfn> method must
-  return an <code><a href="#imagedata">ImageData</a></code> object representing a rectangle
-  with a width in CSS pixels equal to the absolute magnitude of <var title="">sw</var> and a height in CSS pixels equal to the absolute
-  magnitude of <var title="">sh</var>, filled with transparent
-  black.</p>
+  <p>The <dfn id="dom-context-2d-createimagedata" title="dom-context-2d-createImageData"><code>createImageData()</code></dfn>
+  method is used to instantiate new blank <code><a href="#imagedata">ImageData</a></code>
+  objects.  When the method is invoked with two arguments <var title="">sw</var> and <var title="">sh</var>, it must return an
+  <code><a href="#imagedata">ImageData</a></code> object representing a rectangle with a width
+  in CSS pixels equal to the absolute magnitude of <var title="">sw</var> and a height in CSS pixels equal to the absolute
+  magnitude of <var title="">sh</var>. When invoked with a single <var title="">imagedata</var> argument, it must return an
+  <code><a href="#imagedata">ImageData</a></code> object representing a rectangle with the same
+  dimensions as the <code><a href="#imagedata">ImageData</a></code> object passed as the
+  argument. The <code><a href="#imagedata">ImageData</a></code> object return must be filled
+  with transparent black.</p>
 
   <p>The <dfn id="dom-context-2d-getimagedata" title="dom-context-2d-getImageData"><code>getImageData(<var title="">sx</var>, <var title="">sy</var>, <var title="">sw</var>,
   <var title="">sh</var>)</code></dfn> method must return an
@@ -21916,10 +21935,11 @@
 
   <p>If any of the arguments to <code title="dom-context-2d-createImageData"><a href="#dom-context-2d-createimagedata">createImageData()</a></code> or
   <code title="dom-context-2d-getImageData"><a href="#dom-context-2d-getimagedata">getImageData()</a></code> are
-  infinite or NaN, the method must instead raise a
-  <code><a href="#not_supported_err">NOT_SUPPORTED_ERR</a></code> exception. If either the <var title="">sw</var> or <var title="">sh</var> arguments are zero, the
-  method must instead raise an <code><a href="#index_size_err">INDEX_SIZE_ERR</a></code>
-  exception.</p>
+  infinite or NaN, or if the <code title="dom-context-2d-createImageData"><a href="#dom-context-2d-createimagedata">createImageData()</a></code>
+  method is invoked with only one argument but that argument is null,
+  the method must instead raise a <code><a href="#not_supported_err">NOT_SUPPORTED_ERR</a></code>
+  exception. If either the <var title="">sw</var> or <var title="">sh</var> arguments are zero, the method must instead raise
+  an <code><a href="#index_size_err">INDEX_SIZE_ERR</a></code> exception.</p>
 
   <p><code><a href="#imagedata">ImageData</a></code> objects must be initialized so that their
   <dfn id="dom-imagedata-width" title="dom-imagedata-width"><code>width</code></dfn> attribute
Received on Thursday, 30 April 2009 23:01:27 GMT

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