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diff --git a/Source/WebCore/css/CSSSegmentedFontFace.cpp b/Source/WebCore/css/CSSSegmentedFontFace.cpp
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+++ b/Source/WebCore/css/CSSSegmentedFontFace.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 "CSSSegmentedFontFace.h"
+
+#include "CSSFontFace.h"
+#include "CSSFontSelector.h"
+#include "FontDescription.h"
+#include "SegmentedFontData.h"
+#include "SimpleFontData.h"
+
+namespace WebCore {
+
+CSSSegmentedFontFace::CSSSegmentedFontFace(CSSFontSelector* fontSelector)
+    : m_fontSelector(fontSelector)
+{
+}
+
+CSSSegmentedFontFace::~CSSSegmentedFontFace()
+{
+    pruneTable();
+    unsigned size = m_fontFaces.size();
+    for (unsigned i = 0; i < size; i++)
+        m_fontFaces[i]->removedFromSegmentedFontFace(this);
+}
+
+void CSSSegmentedFontFace::pruneTable()
+{
+    // Make sure the glyph page tree prunes out all uses of this custom font.
+    if (m_fontDataTable.isEmpty())
+        return;
+    HashMap<unsigned, SegmentedFontData*>::iterator end = m_fontDataTable.end();
+    for (HashMap<unsigned, SegmentedFontData*>::iterator it = m_fontDataTable.begin(); it != end; ++it)
+        GlyphPageTreeNode::pruneTreeCustomFontData(it->second);
+    deleteAllValues(m_fontDataTable);
+    m_fontDataTable.clear();
+}
+
+bool CSSSegmentedFontFace::isValid() const
+{
+    // Valid if at least one font face is valid.
+    unsigned size = m_fontFaces.size();
+    for (unsigned i = 0; i < size; i++) {
+        if (m_fontFaces[i]->isValid())
+            return true;
+    }
+    return false;
+}
+
+void CSSSegmentedFontFace::fontLoaded(CSSFontFace*)
+{
+    pruneTable();
+}
+
+void CSSSegmentedFontFace::appendFontFace(PassRefPtr<CSSFontFace> fontFace)
+{
+    pruneTable();
+    fontFace->addedToSegmentedFontFace(this);
+    m_fontFaces.append(fontFace);
+}
+
+FontData* CSSSegmentedFontFace::getFontData(const FontDescription& fontDescription)
+{
+    if (!isValid())
+        return 0;
+
+    FontTraitsMask desiredTraitsMask = fontDescription.traitsMask();
+    unsigned hashKey = ((fontDescription.computedPixelSize() + 1) << (FontTraitsMaskWidth + 1)) | ((fontDescription.orientation() == Vertical ? 1 : 0) << FontTraitsMaskWidth) | desiredTraitsMask;
+
+    SegmentedFontData* fontData = m_fontDataTable.get(hashKey);
+    if (fontData)
+        return fontData;
+
+    fontData = new SegmentedFontData();
+
+    unsigned size = m_fontFaces.size();
+    for (unsigned i = 0; i < size; i++) {
+        if (!m_fontFaces[i]->isValid())
+            continue;
+        FontTraitsMask traitsMask = m_fontFaces[i]->traitsMask();
+        bool syntheticBold = !(traitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask)) && (desiredTraitsMask & (FontWeight600Mask | FontWeight700Mask | FontWeight800Mask | FontWeight900Mask));
+        bool syntheticItalic = !(traitsMask & FontStyleItalicMask) && (desiredTraitsMask & FontStyleItalicMask);
+        if (const SimpleFontData* faceFontData = m_fontFaces[i]->getFontData(fontDescription, syntheticBold, syntheticItalic)) {
+            ASSERT(!faceFontData->isSegmented());
+            const Vector<CSSFontFace::UnicodeRange>& ranges = m_fontFaces[i]->ranges();
+            unsigned numRanges = ranges.size();
+            if (!numRanges)
+                fontData->appendRange(FontDataRange(0, 0x7FFFFFFF, faceFontData));
+            else {
+                for (unsigned j = 0; j < numRanges; ++j)
+                    fontData->appendRange(FontDataRange(ranges[j].from(), ranges[j].to(), faceFontData));
+            }
+        }
+    }
+    if (fontData->numRanges())
+        m_fontDataTable.set(hashKey, fontData);
+    else {
+        delete fontData;
+        fontData = 0;
+    }
+
+    return fontData;
+}
+
+}