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diff --git a/WebCore/html/HTMLCanvasElement.h b/WebCore/html/HTMLCanvasElement.h
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+/*
+ * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
+ * Copyright (C) 2007 Alp Toker <alp@atoker.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#ifndef HTMLCanvasElement_h
+#define HTMLCanvasElement_h
+
+#include "HTMLElement.h"
+#include "IntSize.h"
+
+namespace WebCore {
+
+class CanvasRenderingContext2D;
+typedef CanvasRenderingContext2D CanvasRenderingContext;
+class FloatPoint;
+class FloatRect;
+class FloatSize;
+class GraphicsContext;
+class HTMLCanvasElement;
+class ImageBuffer;
+class IntPoint;
+class InttRect;
+class IntSize;
+
+class CanvasObserver {
+public:
+    virtual ~CanvasObserver() {};
+
+    virtual void canvasChanged(HTMLCanvasElement* element, const FloatRect& changedRect) = 0;
+    virtual void canvasResized(HTMLCanvasElement* element) = 0;
+};
+
+class HTMLCanvasElement : public HTMLElement {
+public:
+    HTMLCanvasElement(Document*);
+    virtual ~HTMLCanvasElement();
+
+#if ENABLE(DASHBOARD_SUPPORT)
+    virtual HTMLTagStatus endTagRequirement() const;
+    virtual int tagPriority() const;
+#endif
+
+    int width() const { return m_size.width(); }
+    int height() const { return m_size.height(); }
+    void setWidth(int);
+    void setHeight(int);
+
+    String toDataURL(const String& mimeType, ExceptionCode&);
+
+    CanvasRenderingContext* getContext(const String&);
+
+    virtual void parseMappedAttribute(MappedAttribute*);
+    virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
+
+    IntSize size() const { return m_size; }
+    void setSize(const IntSize& size)
+    { 
+        if (size == m_size)
+            return;
+        m_ignoreReset = true; 
+        setWidth(size.width());
+        setHeight(size.height());
+        m_ignoreReset = false;
+        reset();
+    }
+
+    void willDraw(const FloatRect&);
+
+    void paint(GraphicsContext*, const IntRect&);
+
+    GraphicsContext* drawingContext() const;
+
+    ImageBuffer* buffer() const;
+
+    IntRect convertLogicalToDevice(const FloatRect&) const;
+    IntSize convertLogicalToDevice(const FloatSize&) const;
+    IntPoint convertLogicalToDevice(const FloatPoint&) const;
+
+    void setOriginTainted() { m_originClean = false; } 
+    bool originClean() const { return m_originClean; }
+
+    static const float MaxCanvasArea;
+
+    void setObserver(CanvasObserver* o) { m_observer = o; }
+
+private:
+    void createImageBuffer() const;
+    void reset();
+
+    bool m_rendererIsCanvas;
+
+    OwnPtr<CanvasRenderingContext2D> m_2DContext;
+    IntSize m_size;    
+    CanvasObserver* m_observer;
+
+    bool m_originClean;
+    bool m_ignoreReset;
+
+    // m_createdImageBuffer means we tried to malloc the buffer.  We didn't necessarily get it.
+    mutable bool m_createdImageBuffer;
+    mutable OwnPtr<ImageBuffer> m_imageBuffer;
+};
+
+} //namespace
+
+#endif