1 /* 2 * Copyright (C) 2006, 2008 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2007-2008 Torch Mobile, Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 15 * its contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef FontCache_h 31 #define FontCache_h 32 33 #include <limits.h> 34 #include "platform/PlatformExport.h" 35 #include "wtf/Forward.h" 36 #include "wtf/PassRefPtr.h" 37 #include "wtf/RefPtr.h" 38 #include "wtf/Vector.h" 39 #include "wtf/text/CString.h" 40 #include "wtf/text/WTFString.h" 41 #include "wtf/unicode/Unicode.h" 42 43 #if OS(WIN) 44 #include <windows.h> 45 #include <objidl.h> 46 #include <mlang.h> 47 #endif 48 49 #if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS) 50 #include "SkFontMgr.h" 51 #endif 52 53 class SkTypeface; 54 55 namespace WebCore { 56 57 class FontPlatformData; 58 class FontData; 59 class FontDescription; 60 class FontSelector; 61 class OpenTypeVerticalData; 62 class SimpleFontData; 63 64 enum ShouldRetain { Retain, DoNotRetain }; 65 enum PurgeSeverity { PurgeIfNeeded, ForcePurge }; 66 67 class PLATFORM_EXPORT FontCache { 68 friend class FontCachePurgePreventer; 69 70 WTF_MAKE_NONCOPYABLE(FontCache); WTF_MAKE_FAST_ALLOCATED; 71 public: 72 static FontCache* fontCache(); 73 74 void releaseFontData(const SimpleFontData*); 75 76 // This method is implemented by the plaform and used by 77 // FontFastPath to lookup the font for a given character. 78 PassRefPtr<SimpleFontData> platformFallbackForCharacter(const FontDescription&, UChar32, const SimpleFontData* fontDataToSubstitute, bool disallowSynthetics); 79 80 // Also implemented by the platform. 81 void platformInit(); 82 83 PassRefPtr<SimpleFontData> getFontData(const FontDescription&, const AtomicString&, bool checkingAlternateName = false, ShouldRetain = Retain); 84 PassRefPtr<SimpleFontData> getLastResortFallbackFont(const FontDescription&, ShouldRetain = Retain); 85 SimpleFontData* getNonRetainedLastResortFallbackFont(const FontDescription&); 86 bool isPlatformFontAvailable(const FontDescription&, const AtomicString&); 87 88 void addClient(FontSelector*); 89 void removeClient(FontSelector*); 90 91 unsigned short generation(); 92 void invalidate(); 93 94 #if OS(WIN) 95 PassRefPtr<SimpleFontData> fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT&, wchar_t* outFontFamilyName); 96 #endif 97 98 #if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS) 99 bool useSubpixelPositioning() const { return m_useSubpixelPositioning; } 100 SkFontMgr* fontManager() { return m_fontManager.get(); } 101 #endif 102 103 #if ENABLE(OPENTYPE_VERTICAL) 104 typedef uint32_t FontFileKey; 105 PassRefPtr<OpenTypeVerticalData> getVerticalData(const FontFileKey&, const FontPlatformData&); 106 #endif 107 108 #if OS(ANDROID) 109 static AtomicString getGenericFamilyNameForScript(const AtomicString& familyName, UScriptCode); 110 #else 111 struct SimpleFontFamily { 112 String name; 113 bool isBold; 114 bool isItalic; 115 }; 116 static void getFontFamilyForCharacter(UChar32, const char* preferredLocale, SimpleFontFamily*); 117 #endif 118 119 private: 120 FontCache(); 121 ~FontCache(); 122 123 void purge(PurgeSeverity = PurgeIfNeeded); 124 125 void disablePurging() { m_purgePreventCount++; } 126 void enablePurging() 127 { 128 ASSERT(m_purgePreventCount); 129 if (!--m_purgePreventCount) 130 purge(PurgeIfNeeded); 131 } 132 133 // FIXME: This method should eventually be removed. 134 FontPlatformData* getFontPlatformData(const FontDescription&, const AtomicString& family, bool checkingAlternateName = false); 135 136 // These methods are implemented by each platform. 137 FontPlatformData* createFontPlatformData(const FontDescription&, const AtomicString& family, float fontSize); 138 139 // Implemented on skia platforms. 140 PassRefPtr<SkTypeface> createTypeface(const FontDescription&, const AtomicString& family, CString& name); 141 142 PassRefPtr<SimpleFontData> fontDataFromFontPlatformData(const FontPlatformData*, ShouldRetain = Retain); 143 144 // Don't purge if this count is > 0; 145 int m_purgePreventCount; 146 147 #if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS) 148 OwnPtr<SkFontMgr> m_fontManager; 149 bool m_useSubpixelPositioning; 150 #endif 151 152 #if OS(MACOSX) || OS(ANDROID) 153 friend class ComplexTextController; 154 #endif 155 friend class SimpleFontData; // For fontDataFromFontPlatformData 156 friend class FontFallbackList; 157 }; 158 159 class PLATFORM_EXPORT FontCachePurgePreventer { 160 public: 161 FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); } 162 ~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); } 163 }; 164 165 } 166 167 #endif 168
