1/* 2 * Copyright (C) 2006, 2010, 2013 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 FontGlyphs_h 22#define FontGlyphs_h 23 24#include "FontSelector.h" 25#include "SimpleFontData.h" 26#include "WidthCache.h" 27#include <wtf/Forward.h> 28#include <wtf/MainThread.h> 29 30#if PLATFORM(IOS) 31#include "WebCoreThread.h" 32#endif 33 34namespace WebCore { 35 36class GlyphPageTreeNode; 37class GraphicsContext; 38class IntRect; 39class FontDescription; 40class FontPlatformData; 41class FontSelector; 42 43const int cAllFamiliesScanned = -1; 44 45class FontGlyphs : public RefCounted<FontGlyphs> { 46 WTF_MAKE_NONCOPYABLE(FontGlyphs); 47public: 48 typedef HashMap<int, GlyphPageTreeNode*, DefaultHash<int>::Hash> GlyphPages; 49 50 class GlyphPagesStateSaver { 51 public: 52 GlyphPagesStateSaver(FontGlyphs& glyphs) 53 : m_glyphs(glyphs) 54 , m_pages(glyphs.m_pages) 55 , m_pageZero(glyphs.m_pageZero) 56 { 57 } 58 59 ~GlyphPagesStateSaver() 60 { 61 m_glyphs.m_pages = m_pages; 62 m_glyphs.m_pageZero = m_pageZero; 63 } 64 65 private: 66 FontGlyphs& m_glyphs; 67 GlyphPages& m_pages; 68 GlyphPageTreeNode* m_pageZero; 69 }; 70 71 static PassRef<FontGlyphs> create(PassRefPtr<FontSelector> fontSelector) { return adoptRef(*new FontGlyphs(fontSelector)); } 72 static PassRef<FontGlyphs> createForPlatformFont(const FontPlatformData& platformData) { return adoptRef(*new FontGlyphs(platformData)); } 73 74 ~FontGlyphs() { releaseFontData(); } 75 76 bool isForPlatformFont() const { return m_isForPlatformFont; } 77 78 std::pair<GlyphData, GlyphPage*> glyphDataAndPageForCharacter(const FontDescription&, UChar32, bool mirror, FontDataVariant) const; 79 80 bool isFixedPitch(const FontDescription&) const; 81 void determinePitch(const FontDescription&) const; 82 83 bool loadingCustomFonts() const { return m_loadingCustomFonts; } 84 85 FontSelector* fontSelector() const { return m_fontSelector.get(); } 86 // FIXME: It should be possible to combine fontSelectorVersion and generation. 87 unsigned fontSelectorVersion() const { return m_fontSelectorVersion; } 88 unsigned generation() const { return m_generation; } 89 90 WidthCache& widthCache() const { return m_widthCache; } 91 92 const SimpleFontData* primarySimpleFontData(const FontDescription&) const; 93 const FontData* primaryFontData(const FontDescription& description) const { return realizeFontDataAt(description, 0); } 94 const FontData* realizeFontDataAt(const FontDescription&, unsigned index) const; 95 96private: 97 FontGlyphs(PassRefPtr<FontSelector>); 98 FontGlyphs(const FontPlatformData&); 99 100 void releaseFontData(); 101 102 mutable Vector<RefPtr<FontData>, 1> m_realizedFontData; 103 mutable GlyphPages m_pages; 104 mutable GlyphPageTreeNode* m_pageZero; 105 mutable const SimpleFontData* m_cachedPrimarySimpleFontData; 106 RefPtr<FontSelector> m_fontSelector; 107 mutable WidthCache m_widthCache; 108 unsigned m_fontSelectorVersion; 109 mutable int m_familyIndex; 110 unsigned short m_generation; 111 mutable unsigned m_pitch : 3; // Pitch 112 mutable bool m_loadingCustomFonts : 1; 113 bool m_isForPlatformFont : 1; 114}; 115 116inline bool FontGlyphs::isFixedPitch(const FontDescription& description) const 117{ 118 if (m_pitch == UnknownPitch) 119 determinePitch(description); 120 return m_pitch == FixedPitch; 121}; 122 123inline const SimpleFontData* FontGlyphs::primarySimpleFontData(const FontDescription& description) const 124{ 125 ASSERT(isMainThread()); 126 if (!m_cachedPrimarySimpleFontData) 127 m_cachedPrimarySimpleFontData = primaryFontData(description)->fontDataForCharacter(' '); 128 return m_cachedPrimarySimpleFontData; 129} 130 131} 132 133#endif 134