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      1 /*
      2  * This file is part of the internal font implementation.  It should not be included by anyone other than
      3  * FontMac.cpp, FontWin.cpp and Font.cpp.
      4  *
      5  * Copyright (C) 2006 Apple Computer, Inc.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  *
     22  */
     23 
     24 // This file has no guards on purpose in order to detect redundant includes. This is a private header
     25 // and so this may catch someone trying to include this file in public cpp files.
     26 
     27 #include "FontSelector.h"
     28 #include "SimpleFontData.h"
     29 #include <wtf/Forward.h>
     30 
     31 namespace WebCore {
     32 
     33 class Font;
     34 class GlyphPageTreeNode;
     35 class GraphicsContext;
     36 class IntRect;
     37 class FontDescription;
     38 class FontPlatformData;
     39 class FontSelector;
     40 
     41 const int cAllFamiliesScanned = -1;
     42 
     43 class FontFallbackList : public RefCounted<FontFallbackList> {
     44 public:
     45     static PassRefPtr<FontFallbackList> create() { return adoptRef(new FontFallbackList()); }
     46 
     47     ~FontFallbackList() { releaseFontData(); }
     48     void invalidate(PassRefPtr<FontSelector>);
     49 
     50     bool isFixedPitch(const Font* f) const { if (m_pitch == UnknownPitch) determinePitch(f); return m_pitch == FixedPitch; };
     51     void determinePitch(const Font*) const;
     52 
     53     bool loadingCustomFonts() const { return m_loadingCustomFonts; }
     54 
     55     FontSelector* fontSelector() const { return m_fontSelector.get(); }
     56     unsigned generation() const { return m_generation; }
     57 
     58 private:
     59     FontFallbackList();
     60 
     61     const SimpleFontData* primarySimpleFontData(const Font* f)
     62     {
     63         ASSERT(isMainThread());
     64         if (!m_cachedPrimarySimpleFontData)
     65             m_cachedPrimarySimpleFontData = primaryFontData(f)->fontDataForCharacter(' ');
     66         return m_cachedPrimarySimpleFontData;
     67     }
     68 
     69     const FontData* primaryFontData(const Font* f) const { return fontDataAt(f, 0); }
     70     const FontData* fontDataAt(const Font*, unsigned index) const;
     71     const FontData* fontDataForCharacters(const Font*, const UChar*, int length) const;
     72 
     73     void setPlatformFont(const FontPlatformData&);
     74 
     75     void releaseFontData();
     76 
     77     mutable Vector<pair<const FontData*, bool>, 1> m_fontList;
     78     mutable HashMap<int, GlyphPageTreeNode*> m_pages;
     79     mutable GlyphPageTreeNode* m_pageZero;
     80     mutable const SimpleFontData* m_cachedPrimarySimpleFontData;
     81     RefPtr<FontSelector> m_fontSelector;
     82     mutable int m_familyIndex;
     83     mutable Pitch m_pitch;
     84     mutable bool m_loadingCustomFonts;
     85     unsigned m_generation;
     86 
     87     friend class Font;
     88 };
     89 
     90 }
     91 
     92