Home | History | Annotate | Download | only in graphics 
      1 /*
      2  * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #ifndef FontFallbackList_h
     22 #define FontFallbackList_h
     23 
     24 #include "FontSelector.h"
     25 #include "SimpleFontData.h"
     26 #include <wtf/Forward.h>
     27 
     28 namespace WebCore {
     29 
     30 class Font;
     31 class GlyphPageTreeNode;
     32 class GraphicsContext;
     33 class IntRect;
     34 class FontDescription;
     35 class FontPlatformData;
     36 class FontSelector;
     37 
     38 const int cAllFamiliesScanned = -1;
     39 
     40 class FontFallbackList : public RefCounted<FontFallbackList> {
     41 public:
     42     static PassRefPtr<FontFallbackList> create() { return adoptRef(new FontFallbackList()); }
     43 
     44     ~FontFallbackList() { releaseFontData(); }
     45     void invalidate(PassRefPtr<FontSelector>);
     46 
     47     bool isFixedPitch(const Font* f) const { if (m_pitch == UnknownPitch) determinePitch(f); return m_pitch == FixedPitch; };
     48     void determinePitch(const Font*) const;
     49 
     50     bool loadingCustomFonts() const { return m_loadingCustomFonts; }
     51 
     52     FontSelector* fontSelector() const { return m_fontSelector.get(); }
     53     unsigned generation() const { return m_generation; }
     54 
     55 private:
     56     FontFallbackList();
     57 
     58     const SimpleFontData* primarySimpleFontData(const Font* f)
     59     {
     60         ASSERT(isMainThread());
     61         if (!m_cachedPrimarySimpleFontData)
     62             m_cachedPrimarySimpleFontData = primaryFontData(f)->fontDataForCharacter(' ');
     63         return m_cachedPrimarySimpleFontData;
     64     }
     65 
     66     const FontData* primaryFontData(const Font* f) const { return fontDataAt(f, 0); }
     67     const FontData* fontDataAt(const Font*, unsigned index) const;
     68 
     69     void setPlatformFont(const FontPlatformData&);
     70 
     71     void releaseFontData();
     72 
     73     mutable Vector<pair<const FontData*, bool>, 1> m_fontList;
     74     mutable HashMap<int, GlyphPageTreeNode*> m_pages;
     75     mutable GlyphPageTreeNode* m_pageZero;
     76     mutable const SimpleFontData* m_cachedPrimarySimpleFontData;
     77     RefPtr<FontSelector> m_fontSelector;
     78     mutable int m_familyIndex;
     79     mutable Pitch m_pitch;
     80     mutable bool m_loadingCustomFonts;
     81     unsigned m_generation;
     82 
     83     friend class Font;
     84 };
     85 
     86 }
     87 
     88 #endif
     89