Refactoring source image usage in CanvasRenderingContext2D

Source/core/html/HTMLImageElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef HTMLImageElement_h
 #define HTMLImageElement_h
 
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLImageLoader.h"
+#include "core/html/canvas/CanvasImageSource.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "wtf/WeakPtr.h"
 
 namespace WebCore {
 
 class HTMLFormElement;
 
-class HTMLImageElement FINAL : public HTMLElement {
+class HTMLImageElement FINAL : public HTMLElement, public CanvasImageSource {
 public:
     static PassRefPtr<HTMLImageElement> create(Document&);
     static PassRefPtr<HTMLImageElement> create(Document&, HTMLFormElement*);
     static PassRefPtr<HTMLImageElement> createForJSConstructor(Document&, int width, int height);
 
     virtual ~HTMLImageElement();
 
     int width(bool ignorePendingStylesheets = false);
     int height(bool ignorePendingStylesheets = false);
 
@@ skipping 30 matching lines @@
     virtual bool canContainRangeEndPoint() const OVERRIDE { return false; }
 
     void addClient(ImageLoaderClient* client) { m_imageLoader.addClient(client); }
     void removeClient(ImageLoaderClient* client) { m_imageLoader.removeClient(client); }
 
     virtual const AtomicString imageSourceURL() const OVERRIDE;
 
     virtual HTMLFormElement* formOwner() const OVERRIDE;
     void formRemovedFromTree(const Node& formRoot);
 
+    // CanvasImageSourceImplementations
+    virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const;
+    virtual bool wouldTaintOrigin(SecurityOrigin*) const OVERRIDE;
+    virtual FloatSize sourceSize() const OVERRIDE;
+    virtual FloatSize defaultDestinationSize() const OVERRIDE;
+
 protected:
     explicit HTMLImageElement(Document&, HTMLFormElement* = 0);
 
     virtual void didMoveToNewDocument(Document& oldDocument) OVERRIDE;
 
 private:
     virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
@@ skipping 22 matching lines @@
     WeakPtr<HTMLFormElement> m_form;
     CompositeOperator m_compositeOperator;
     AtomicString m_bestFitImageURL;
     float m_imageDevicePixelRatio;
     bool m_formWasSetByParser;
 };
 
 } //namespace
 
 #endif