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diff --git a/WebCore/css/CSSImageGeneratorValue.cpp b/WebCore/css/CSSImageGeneratorValue.cpp
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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. 
+ */
+
+#include "config.h"
+#include "CSSImageGeneratorValue.h"
+
+#include "Image.h"
+#include "IntSize.h"
+#include "IntSizeHash.h"
+#include "PlatformString.h"
+#include "RenderObject.h"
+#include "StyleGeneratedImage.h"
+
+namespace WebCore {
+
+CSSImageGeneratorValue::CSSImageGeneratorValue()
+: m_accessedImage(false)
+{
+}
+
+CSSImageGeneratorValue::~CSSImageGeneratorValue()
+{
+}
+
+void CSSImageGeneratorValue::addClient(RenderObject* renderer, const IntSize& size)
+{
+    ref();
+    if (!size.isEmpty())
+        m_sizes.add(size);
+    m_clients.add(renderer, size);
+}
+
+void CSSImageGeneratorValue::removeClient(RenderObject* renderer)
+{
+    IntSize size = m_clients.get(renderer);
+    if (!size.isEmpty()) {
+        m_sizes.remove(size);
+        if (!m_sizes.contains(size))
+            m_images.remove(size);
+    }
+    m_clients.remove(renderer);
+    deref();
+}
+
+Image* CSSImageGeneratorValue::getImage(RenderObject* renderer, const IntSize& size)
+{
+    IntSize oldSize = m_clients.get(renderer);
+    if (oldSize != size) {
+        removeClient(renderer);
+        addClient(renderer, size);
+    }
+    
+    // Don't generate an image for empty sizes.
+    if (size.isEmpty())
+        return 0;
+    
+    // Look up the image in our cache.
+    return m_images.get(size).get();
+}
+
+void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)
+{
+    m_images.add(size, image);
+}
+
+StyleGeneratedImage* CSSImageGeneratorValue::generatedImage()
+{
+    if (!m_accessedImage) {
+        m_accessedImage = true;
+        m_image = StyleGeneratedImage::create(this, isFixedSize());
+    }
+    return m_image.get();
+}
+
+} // namespace WebCore