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diff --git a/WebCore/css/CSSImageGeneratorValue.h b/WebCore/css/CSSImageGeneratorValue.h
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+/*
+ * Copyright (C) 2008 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 CSSImageGeneratorValue_h
+#define CSSImageGeneratorValue_h
+
+#include "CSSValue.h"
+#include "IntSizeHash.h"
+#include <wtf/HashMap.h>
+#include <wtf/HashCountedSet.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class Image;
+class StyleGeneratedImage;
+class RenderObject;
+
+class CSSImageGeneratorValue : public CSSValue {
+public:
+    virtual ~CSSImageGeneratorValue();
+
+    void addClient(RenderObject*, const IntSize&);
+    void removeClient(RenderObject*);
+    virtual Image* image(RenderObject*, const IntSize&) = 0;
+
+    StyleGeneratedImage* generatedImage();
+    
+    virtual bool isFixedSize() const { return false; }
+    virtual IntSize fixedSize(const RenderObject*) { return IntSize(); }
+    
+protected:
+    CSSImageGeneratorValue();
+    
+    Image* getImage(RenderObject*, const IntSize&);
+    void putImage(const IntSize&, PassRefPtr<Image>);
+
+    HashCountedSet<IntSize> m_sizes; // A count of how many times a given image size is in use.
+    HashMap<RenderObject*, IntSize> m_clients; // A map from RenderObjects to image sizes.
+    HashMap<IntSize, RefPtr<Image> > m_images; // A cache of Image objects by image size.
+    
+    RefPtr<StyleGeneratedImage> m_image;
+    bool m_accessedImage;
+
+private:
+    virtual bool isImageGeneratorValue() const { return true; }
+};
+
+} // namespace WebCore
+
+#endif // CSSImageGeneratorValue_h