Allow SVG images to not taint the canvas with drawImage/drawPattern

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 10 matching lines @@
  */
 
 #include "config.h"
 #include "core/html/HTMLImageElement.h"
 
 #include "CSSPropertyNames.h"
 #include "HTMLNames.h"
 #include "bindings/v8/ScriptEventListener.h"
 #include "core/dom/Attribute.h"
 #include "core/dom/EventNames.h"
+#include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/loader/cache/ImageResource.h"
 #include "core/rendering/RenderImage.h"
 
 using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
@@ skipping 66 matching lines @@
 }
 
 void HTMLImageElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == altAttr) {
         if (renderer() && renderer()->isImage())
             toRenderImage(renderer())->updateAltText();
     } else if (name == srcAttr)
         m_imageLoader.updateFromElementIgnoringPreviousError();
     else if (name == usemapAttr)
-        setIsLink(!value.isNull());
+        setIsLink(!value.isNull() && !shouldProhibitLinks(this));

[abarth-chromium, 2013/08/12 19:47:44]

Can we have an ASSERT in setIsLink?

[pdr., 2013/08/19 23:16:17]

Done.

     else if (name == onbeforeloadAttr)
         setAttributeEventListener(eventNames().beforeloadEvent, createAttributeEventListener(this, name, value));
     else if (name == compositeAttr) {
         // FIXME: images don't support blend modes in their compositing attribute.
         BlendMode blendOp = BlendModeNormal;
         if (!parseCompositeAndBlendOperator(value, m_compositeOperator, blendOp))
             m_compositeOperator = CompositeSourceOver;
     } else
         HTMLElement::parseAttribute(name, value);
 }
@@ skipping 233 matching lines @@
 
 Image* HTMLImageElement::imageContents()
 {
     if (!m_imageLoader.imageComplete())
         return 0;
 
     return m_imageLoader.image()->image();
 }
 
 }