Encapsulate FontFallbackList's page access logic.

Source/platform/fonts/FontFallbackList.h

 /*
  * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 69 matching lines @@
     bool loadingCustomFonts() const;
     bool shouldSkipDrawing() const;
 
     FontSelector* fontSelector() const { return m_fontSelector.get(); }
     // FIXME: It should be possible to combine fontSelectorVersion and generation.
     unsigned fontSelectorVersion() const { return m_fontSelectorVersion; }
     unsigned generation() const { return m_generation; }
 
     WidthCache& widthCache() const { return m_widthCache; }
 
-private:
-    FontFallbackList();
-
     const SimpleFontData* primarySimpleFontData(const FontDescription& fontDescription)
     {
         ASSERT(isMainThread());
         if (!m_cachedPrimarySimpleFontData)
             m_cachedPrimarySimpleFontData = determinePrimarySimpleFontData(fontDescription);
         return m_cachedPrimarySimpleFontData;
     }
+    const FontData* fontDataAt(const FontDescription&, unsigned index) const;
+
+    GlyphPageTreeNode* getPageNode(unsigned pageNumber) const
+    {
+        return pageNumber ? m_pages.get(pageNumber) : m_pageZero;
+    }
+
+    void setPageNode(unsigned pageNumber, GlyphPageTreeNode* node)
+    {
+        if (pageNumber)
+            m_pages.set(pageNumber, node);
+        else
+            m_pageZero = node;
+    }
+
+private:
+    FontFallbackList();
 
     PassRefPtr<FontData> getFontData(const FontDescription&, int& familyIndex) const;
 
     const SimpleFontData* determinePrimarySimpleFontData(const FontDescription&) const;
-    const FontData* fontDataAt(const FontDescription&, unsigned index) const;
 
     void releaseFontData();
 
     mutable Vector<RefPtr<FontData>, 1> m_fontList;
-    mutable GlyphPages m_pages;
-    mutable GlyphPageTreeNode* m_pageZero;
+    GlyphPages m_pages;
+    GlyphPageTreeNode* m_pageZero;
     mutable const SimpleFontData* m_cachedPrimarySimpleFontData;
     RefPtrWillBePersistent<FontSelector> m_fontSelector;
     mutable WidthCache m_widthCache;
     unsigned m_fontSelectorVersion;
     mutable int m_familyIndex;
     unsigned short m_generation;
     mutable unsigned m_pitch : 3; // Pitch
     mutable bool m_hasLoadingFallback : 1;
-
-    friend class Font;
 };
 
 }
 
 #endif