Encapsulate FontFallbackList's page access logic.

Source/platform/fonts/Font.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2010, 2011 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.
@@ skipping 396 matching lines @@
         } else {
             variant = NormalVariant;
         }
     }
 
     if (mirror)
         c = mirroredChar(c);
 
     unsigned pageNumber = (c / GlyphPage::size);
 
-    GlyphPageTreeNode* node = pageNumber ? m_fontFallbackList->m_pages.get(pageNumber) : m_fontFallbackList->m_pageZero;
+    GlyphPageTreeNode* node = m_fontFallbackList->getPageNode(pageNumber);
     if (!node) {
         node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
-        if (pageNumber)
-            m_fontFallbackList->m_pages.set(pageNumber, node);
-        else
-            m_fontFallbackList->m_pageZero = node;
+        m_fontFallbackList->setPageNode(pageNumber, node);
     }
 
     GlyphPage* page = 0;
     if (variant == NormalVariant) {
         // Fastest loop, for the common case (normal variant).
         while (true) {
             page = node->page();
             if (page) {
                 GlyphData data = page->glyphDataForCharacter(c);
                 if (data.fontData && (data.fontData->platformData().orientation() == Horizontal || data.fontData->isTextOrientationFallback()))
@@ skipping 13 matching lines @@
 
                     return make_pair(data, page);
                 }
 
                 if (node->isSystemFallback())
                     break;
             }
 
             // Proceed with the fallback list.
             node = node->getChild(fontDataAt(node->level()), pageNumber);
-            if (pageNumber)
-                m_fontFallbackList->m_pages.set(pageNumber, node);
-            else
-                m_fontFallbackList->m_pageZero = node;
+            m_fontFallbackList->setPageNode(pageNumber, node);
         }
     }
     if (variant != NormalVariant) {
         while (true) {
             page = node->page();
             if (page) {
                 GlyphData data = page->glyphDataForCharacter(c);
                 if (data.fontData) {
                     // The variantFontData function should not normally return 0.
                     // But if it does, we will just render the capital letter big.
@@ skipping 13 matching lines @@
                     // a font has the lowercase character but the small caps font does not have its uppercase version.
                     return make_pair(variantFontData->missingGlyphData(), page);
                 }
 
                 if (node->isSystemFallback())
                     break;
             }
 
             // Proceed with the fallback list.
             node = node->getChild(fontDataAt(node->level()), pageNumber);
-            if (pageNumber)
-                m_fontFallbackList->m_pages.set(pageNumber, node);
-            else
-                m_fontFallbackList->m_pageZero = node;
+            m_fontFallbackList->setPageNode(pageNumber, node);
         }
     }
 
     ASSERT(page);
     ASSERT(node->isSystemFallback());
 
     // System fallback is character-dependent. When we get here, we
     // know that the character in question isn't in the system fallback
     // font's glyph page. Try to lazily create it here.
 
@@ skipping 344 matching lines @@
                 if (delta <= 0)
                     break;
             }
         }
     }
 
     return offset;
 }
 
 }