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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 CSSFontFaceSource_h
     27 #define CSSFontFaceSource_h
     28 
     29 #include "core/fetch/FontResource.h"
     30 #include "core/fetch/ResourcePtr.h"
     31 #include "platform/Timer.h"
     32 #include "wtf/HashMap.h"
     33 #include "wtf/text/AtomicString.h"
     34 
     35 namespace WebCore {
     36 
     37 class FontResource;
     38 class CSSFontFace;
     39 class FontDescription;
     40 class SimpleFontData;
     41 #if ENABLE(SVG_FONTS)
     42 class SVGFontElement;
     43 class SVGFontFaceElement;
     44 #endif
     45 
     46 
     47 class CSSFontFaceSource : public FontResourceClient {
     48 public:
     49     CSSFontFaceSource(const String&, FontResource* = 0);
     50     virtual ~CSSFontFaceSource();
     51 
     52     bool isLocal() const;
     53     bool isLoading() const;
     54     bool isLoaded() const;
     55     bool isValid() const;
     56 
     57     FontResource* resource() { return m_font.get(); }
     58     void setFontFace(CSSFontFace* face) { m_face = face; }
     59 
     60     virtual void didStartFontLoad(FontResource*) OVERRIDE;
     61     virtual void fontLoaded(FontResource*);
     62 
     63     PassRefPtr<SimpleFontData> getFontData(const FontDescription&);
     64 
     65 #if ENABLE(SVG_FONTS)
     66     SVGFontFaceElement* svgFontFaceElement() const;
     67     void setSVGFontFaceElement(PassRefPtr<SVGFontFaceElement>);
     68     bool isSVGFontFaceSource() const;
     69     void setHasExternalSVGFont(bool value) { m_hasExternalSVGFont = value; }
     70 #endif
     71 
     72     bool ensureFontData();
     73     bool isLocalFontAvailable(const FontDescription&);
     74     void beginLoadIfNeeded();
     75 
     76 private:
     77     typedef HashMap<unsigned, RefPtr<SimpleFontData> > FontDataTable; // The hash key is composed of size synthetic styles.
     78 
     79     class FontLoadHistograms {
     80     public:
     81         FontLoadHistograms() : m_loadStartTime(0) { }
     82         void loadStarted();
     83         void recordLocalFont(bool loadSuccess);
     84         void recordRemoteFont(const FontResource*);
     85     private:
     86         const char* histogramName(const FontResource*);
     87         double m_loadStartTime;
     88     };
     89 
     90     void pruneTable();
     91     void startLoadingTimerFired(Timer<CSSFontFaceSource>*);
     92 
     93     AtomicString m_string; // URI for remote, built-in font name for local.
     94     ResourcePtr<FontResource> m_font; // For remote fonts, a pointer to our cached resource.
     95     CSSFontFace* m_face; // Our owning font face.
     96     FontDataTable m_fontDataTable;
     97     FontLoadHistograms m_histograms;
     98 
     99 #if ENABLE(SVG_FONTS)
    100     RefPtr<SVGFontFaceElement> m_svgFontFaceElement;
    101     RefPtr<SVGFontElement> m_externalSVGFontElement;
    102     bool m_hasExternalSVGFont;
    103 #endif
    104 };
    105 
    106 }
    107 
    108 #endif
    109