[g] (2) Change the way we allow custom ImageData objects to be created

git-svn-id: http://svn.whatwg.org/webapps@822 340c8d12-0b0e-0410-8428-c7bf67bfef74

index

@@ -22,7 +22,7 @@
 
    <h1 id=html-5>HTML 5</h1>
 
-   <h2 class="no-num no-toc" id=working>Working Draft &mdash; 16 May 2007</h2>
+   <h2 class="no-num no-toc" id=working>Working Draft &mdash; 17 May 2007</h2>
 
    <p>You can take part in this work. <a
     href="http://www.whatwg.org/mailing-list">Join the working group's
@@ -144,7 +144,7 @@
       requirements</a>
       <ul class=toc>
        <li><a href="#common"><span class=secno>1.3.1. </span>Common
-        conformance requirements for APIs</a>
+        conformance requirements for APIs exposed to JavaScript</a>
 
        <li><a href="#dependencies"><span class=secno>1.3.2.
         </span>Dependencies</a>
@@ -1973,7 +1973,7 @@
   <!-- XXX unexpandable entities? -->
 
   <h4 id=common><span class=secno>1.3.1. </span>Common conformance
-   requirements for APIs</h4>
+   requirements for APIs exposed to JavaScript</h4>
 
   <p class=big-issue>A lot of arrays/lists/<span>collection</span>s in this
    spec assume zero-based indexes but use the term "<var
@@ -2002,6 +2002,17 @@
    defined for that method in its IDL definition, the excess arguments must
    be ignored.
 
+  <p>Unless other specified, if a method is expecting, as one of its
+   arguments, as defined by its IDL definition, an object implementing a
+   particular interface <var title="">X</var>, and the argument passed is an
+   object whose [[Class]] property is neither that interface <var
+   title="">X</var>, nor the name of an interface <var title="">Y</var> where
+   this specification requires that all objects implementing interface <var
+   title="">Y</var> also implement interface <var title="">X</var>, nor the
+   name of an interface that inherits from the expected interface <var
+   title="">X</var>, then a <code title="">TYPE_MISMATCH_ERR</code> exception
+   must be raised.
+
   <p class=big-issue>Anything else? Passing the wrong type of object, maybe?
    Implied conversions to int/float?
 
@@ -16742,35 +16753,38 @@ notes on what would need to be defined for dashed lines:
    canvas coordinate space, mapping each pixel represented by the <code><a
    href="#imagedata">ImageData</a></code> structure into one device pixel.
 
-  <p>If any of the following conditions are true, the method must raise a
-   <code>TYPE_MISMATCH_ERR</code> exception:
+  <p>If the first argument to the method is not an object whose [[Class]]
+   property is <code><a href="#imagedata">ImageData</a></code>, but all of
+   the following conditions are true, then the method must treat the first
+   argument as if it was an <code><a href="#imagedata">ImageData</a></code>
+   object (and thus not raise the <code>TYPE_MISMATCH_ERR</code> exception):
 
   <ul>
-   <li>The method's first argument is not an object with <code
+   <li>The method's first argument is an object with <code
     title=dom-imagedata-width><a href="#width5">width</a></code> and <code
     title=dom-imagedata-height><a href="#height5">height</a></code>
     attributes with integer values and a <code title=dom-imagedata-data><a
     href="#data1">data</a></code> attribute whose value is an integer array.
 
    <li>The <code><a href="#imagedata">ImageData</a></code> object's <code
-    title=dom-imagedata-width><a href="#width5">width</a></code> is not
-    greater than zero.
+    title=dom-imagedata-width><a href="#width5">width</a></code> is greater
+    than zero.
 
    <li>The <code><a href="#imagedata">ImageData</a></code> object's <code
-    title=dom-imagedata-height><a href="#height5">height</a></code> is not
+    title=dom-imagedata-height><a href="#height5">height</a></code> is
     greater than zero.
 
    <li>The <code><a href="#imagedata">ImageData</a></code> object's <code
     title=dom-imagedata-width><a href="#width5">width</a></code> multiplied
     by its <code title=dom-imagedata-height><a
-    href="#height5">height</a></code> multiplied by 4 is not equal to the
-    number of entries in the the <code><a
-    href="#imagedata">ImageData</a></code> object's <code
-    title=dom-imagedata-data><a href="#data1">data</a></code> array.
+    href="#height5">height</a></code> multiplied by 4 is equal to the number
+    of entries in the <code><a href="#imagedata">ImageData</a></code>
+    object's <code title=dom-imagedata-data><a href="#data1">data</a></code>
+    array.
 
    <li>The <code><a href="#imagedata">ImageData</a></code> object's <code
-    title=dom-imagedata-data><a href="#data1">data</a></code> array contains
-    entries that are not in the range 0 to 255 inclusive.
+    title=dom-imagedata-data><a href="#data1">data</a></code> array only
+    contains entries that are in the range 0 to 255 inclusive.
   </ul>
 
   <p>The handling of pixel rounding when the specified coordinates do not

source

@@ -448,7 +448,8 @@
   well.</p> <!-- XXX unexpandable entities? -->
 
 
-  <h4>Common conformance requirements for APIs</h4>
+  <h4>Common conformance requirements for APIs exposed to
+  JavaScript</h4>
 
   <p class="big-issue">A lot of arrays/lists/<span>collection</span>s
   in this spec assume zero-based indexes but use the term "<var
@@ -477,9 +478,21 @@
   a <code title="big-issue">NOT_SUPPORTED_ERR</code> exception must be
   raised.</p>
 
-  <p>Unless other specified, if a method is passed more
-  arguments than is defined for that method in its IDL definition,
-  the excess arguments must be ignored.</p>
+  <p>Unless other specified, if a method is passed more arguments than
+  is defined for that method in its IDL definition, the excess
+  arguments must be ignored.</p>
+
+  <p>Unless other specified, if a method is expecting, as one of its
+  arguments, as defined by its IDL definition, an object implementing
+  a particular interface <var title="">X</var>, and the argument
+  passed is an object whose [[Class]] property is neither that
+  interface <var title="">X</var>, nor the name of an interface <var
+  title="">Y</var> where this specification requires that all objects
+  implementing interface <var title="">Y</var> also implement
+  interface <var title="">X</var>, nor the name of an interface that
+  inherits from the expected interface <var title="">X</var>, then a
+  <code title="">TYPE_MISMATCH_ERR</code> exception must be
+  raised.</p>
 
   <p class="big-issue">Anything else? Passing the wrong type of
   object, maybe? Implied conversions to int/float?</p>
@@ -14362,34 +14375,37 @@ notes on what would need to be defined for dashed lines:
   coordinate space, mapping each pixel represented by the
   <code>ImageData</code> structure into one device pixel.</p>
 
-  <p>If any of the following conditions are true, the method must
-  raise a <code>TYPE_MISMATCH_ERR</code> exception:</p>
+  <p>If the first argument to the method is not an object whose
+  [[Class]] property is <code>ImageData</code>, but all of the
+  following conditions are true, then the method must treat the first
+  argument as if it was an <code>ImageData</code> object (and thus not
+  raise the <code>TYPE_MISMATCH_ERR</code> exception):</p>
 
   <ul>
 
-   <li>The method's first argument is not an object with <code
+   <li>The method's first argument is an object with <code
    title="dom-imagedata-width">width</code> and <code
    title="dom-imagedata-height">height</code> attributes with integer
    values and a <code title="dom-imagedata-data">data</code> attribute
    whose value is an integer array.</li>
 
    <li>The <code>ImageData</code> object's <code
-   title="dom-imagedata-width">width</code> is not greater than
+   title="dom-imagedata-width">width</code> is greater than
    zero.</li>
 
    <li>The <code>ImageData</code> object's <code
-   title="dom-imagedata-height">height</code> is not greater than
+   title="dom-imagedata-height">height</code> is greater than
    zero.</li>
 
    <li>The <code>ImageData</code> object's <code
    title="dom-imagedata-width">width</code> multiplied by its <code
-   title="dom-imagedata-height">height</code> multiplied by 4 is not
-   equal to the number of entries in the the <code>ImageData</code>
-   object's <code title="dom-imagedata-data">data</code> array.</li>
+   title="dom-imagedata-height">height</code> multiplied by 4 is equal
+   to the number of entries in the <code>ImageData</code> object's
+   <code title="dom-imagedata-data">data</code> array.</li>
 
    <li>The <code>ImageData</code> object's <code
-   title="dom-imagedata-data">data</code> array contains entries that
-   are not in the range 0 to 255 inclusive.</li>
+   title="dom-imagedata-data">data</code> array only contains entries
+   that are in the range 0 to 255 inclusive.</li>
 
   </ul>