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diff --git a/WebCore/html/canvas/CanvasUnsignedByteArray.h b/WebCore/html/canvas/CanvasUnsignedByteArray.h
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+/*
+ * Copyright (C) 2009 Apple Inc. All rights reserved.
+ *
+ * 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 CanvasUnsignedByteArray_h
+#define CanvasUnsignedByteArray_h
+
+#include "CanvasArray.h"
+#include <limits>
+#include <wtf/MathExtras.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+    
+    class CanvasUnsignedByteArray : public CanvasArray {
+    public:
+        static PassRefPtr<CanvasUnsignedByteArray> create(unsigned length);
+        static PassRefPtr<CanvasUnsignedByteArray> create(unsigned char* array, unsigned length);
+        static PassRefPtr<CanvasUnsignedByteArray> create(PassRefPtr<CanvasArrayBuffer> buffer, int offset, unsigned length);
+
+        unsigned char* data() { return static_cast<unsigned char*>(baseAddress()); }
+        
+        virtual unsigned length() const;
+        virtual unsigned sizeInBytes() const;
+
+        void set(unsigned index, double value)
+        {
+            if (index >= m_size)
+                return;
+            if (isnan(value)) // Clamp NaN to 0
+                value = 0;
+            if (value < std::numeric_limits<unsigned char>::min())
+                value = std::numeric_limits<unsigned char>::min();
+            else if (value > std::numeric_limits<unsigned char>::max())
+                value = std::numeric_limits<unsigned char>::max();
+            unsigned char* storage = static_cast<unsigned char*>(m_baseAddress);
+            storage[index] = static_cast<unsigned char>(value);
+        }
+        
+        bool get(unsigned index, unsigned char& result) const
+        {
+            if (index >= m_size)
+                return false;
+            result = item(index);
+            return true;
+        }
+        
+        unsigned char item(unsigned index) const
+        {
+            ASSERT(index < m_size);
+            unsigned char* storage = static_cast<unsigned char*>(m_baseAddress);
+            return storage[index];
+        }
+
+    private:
+        CanvasUnsignedByteArray(PassRefPtr<CanvasArrayBuffer> buffer, int offset, unsigned length);
+        unsigned m_size;
+    };
+    
+} // namespace WebCore
+
+#endif // CanvasUnsignedByteArray_h