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