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      1 /*
      2  * Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef CSSFontSelector_h
     27 #define CSSFontSelector_h
     28 
     29 #include "core/css/CSSSegmentedFontFaceCache.h"
     30 #include "core/fetch/ResourcePtr.h"
     31 #include "platform/Timer.h"
     32 #include "platform/fonts/FontSelector.h"
     33 #include "platform/fonts/GenericFontFamilySettings.h"
     34 #include "wtf/Forward.h"
     35 #include "wtf/HashMap.h"
     36 #include "wtf/HashSet.h"
     37 
     38 namespace WebCore {
     39 
     40 class CSSFontFace;
     41 class CSSFontFaceRule;
     42 class CSSSegmentedFontFace;
     43 class FontResource;
     44 class Document;
     45 class FontDescription;
     46 class StyleRuleFontFace;
     47 
     48 class FontLoader {
     49 public:
     50     explicit FontLoader(ResourceFetcher*);
     51 
     52     void addFontToBeginLoading(FontResource*);
     53     void loadPendingFonts();
     54 
     55     void clearResourceFetcher();
     56 
     57 private:
     58     void beginLoadTimerFired(Timer<FontLoader>*);
     59 
     60     Timer<FontLoader> m_beginLoadingTimer;
     61     Vector<ResourcePtr<FontResource> > m_fontsToBeginLoading;
     62     ResourceFetcher* m_resourceFetcher;
     63 };
     64 
     65 class CSSFontSelector : public FontSelector {
     66 public:
     67     static PassRefPtr<CSSFontSelector> create(Document* document)
     68     {
     69         return adoptRef(new CSSFontSelector(document));
     70     }
     71     virtual ~CSSFontSelector();
     72 
     73     virtual unsigned version() const OVERRIDE { return m_cssSegmentedFontFaceCache.version(); }
     74 
     75     virtual PassRefPtr<FontData> getFontData(const FontDescription&, const AtomicString&);
     76     CSSSegmentedFontFace* getFontFace(const FontDescription&, const AtomicString& family);
     77     virtual void willUseFontData(const FontDescription&, const AtomicString& family) OVERRIDE;
     78 
     79     void clearDocument();
     80 
     81     void addFontFaceRule(const StyleRuleFontFace*, PassRefPtr<CSSFontFace>);
     82     void removeFontFaceRule(const StyleRuleFontFace*);
     83 
     84     void fontLoaded();
     85     virtual void fontCacheInvalidated();
     86 
     87     virtual void registerForInvalidationCallbacks(FontSelectorClient*);
     88     virtual void unregisterForInvalidationCallbacks(FontSelectorClient*);
     89 
     90     Document* document() const { return m_document; }
     91 
     92     const GenericFontFamilySettings& genericFontFamilySettings() const { return m_genericFontFamilySettings; }
     93 
     94     void beginLoadingFontSoon(FontResource*);
     95     void loadPendingFonts();
     96 
     97 private:
     98     explicit CSSFontSelector(Document*);
     99 
    100     void dispatchInvalidationCallbacks();
    101 
    102     Document* m_document;
    103     // FIXME: Move to Document or StyleEngine.
    104     CSSSegmentedFontFaceCache m_cssSegmentedFontFaceCache;
    105     HashSet<FontSelectorClient*> m_clients;
    106 
    107     FontLoader m_fontLoader;
    108     GenericFontFamilySettings m_genericFontFamilySettings;
    109 };
    110 
    111 } // namespace WebCore
    112 
    113 #endif // CSSFontSelector_h
    114