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 <wtf/Forward.h> 35 #include <wtf/Vector.h> 36 #include <wtf/unicode/Unicode.h> 37 38 #if PLATFORM(WIN) 39 #include <objidl.h> 40 #include <mlang.h> 41 #endif 42 43 namespace WebCore 44 { 45 46 class Font; 47 class FontPlatformData; 48 class FontData; 49 class FontDescription; 50 class FontSelector; 51 class SimpleFontData; 52 53 class FontCache { 54 WTF_MAKE_NONCOPYABLE(FontCache); WTF_MAKE_FAST_ALLOCATED; 55 public: 56 friend FontCache* fontCache(); 57 58 const FontData* getFontData(const Font&, int& familyIndex, FontSelector*); 59 void releaseFontData(const SimpleFontData*); 60 61 // This method is implemented by the platform. 62 // FIXME: Font data returned by this method never go inactive because callers don't track and release them. 63 const SimpleFontData* getFontDataForCharacters(const Font&, const UChar* characters, int length); 64 65 // Also implemented by the platform. 66 void platformInit(); 67 68 #if OS(WINCE) && !PLATFORM(QT) 69 #if defined(IMLANG_FONT_LINK) && (IMLANG_FONT_LINK == 2) 70 IMLangFontLink2* getFontLinkInterface(); 71 #else 72 IMLangFontLink* getFontLinkInterface(); 73 #endif 74 static void comInitialize(); 75 static void comUninitialize(); 76 static IMultiLanguage* getMultiLanguageInterface(); 77 #elif PLATFORM(WIN) 78 IMLangFontLink2* getFontLinkInterface(); 79 #endif 80 81 void getTraitsInFamily(const AtomicString&, Vector<unsigned>&); 82 83 SimpleFontData* getCachedFontData(const FontDescription& fontDescription, const AtomicString& family, bool checkingAlternateName = false); 84 SimpleFontData* getLastResortFallbackFont(const FontDescription&); 85 86 void addClient(FontSelector*); 87 void removeClient(FontSelector*); 88 89 unsigned generation(); 90 void invalidate(); 91 92 size_t fontDataCount(); 93 size_t inactiveFontDataCount(); 94 void purgeInactiveFontData(int count = INT_MAX); 95 96 private: 97 FontCache(); 98 ~FontCache(); 99 100 // FIXME: This method should eventually be removed. 101 FontPlatformData* getCachedFontPlatformData(const FontDescription&, const AtomicString& family, bool checkingAlternateName = false); 102 103 // These methods are implemented by each platform. 104 SimpleFontData* getSimilarFontPlatformData(const Font&); 105 FontPlatformData* createFontPlatformData(const FontDescription&, const AtomicString& family); 106 107 SimpleFontData* getCachedFontData(const FontPlatformData*); 108 109 friend class SimpleFontData; // For getCachedFontData(const FontPlatformData*) 110 friend class FontFallbackList; 111 }; 112 113 // Get the global fontCache. 114 FontCache* fontCache(); 115 116 } 117 118 #endif 119