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      1 /*
      2  * Copyright (C) 2007, 2008 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 CSSFontFace_h
     27 #define CSSFontFace_h
     28 
     29 #include "core/css/CSSFontFaceSource.h"
     30 #include "core/css/FontFace.h"
     31 #include "wtf/Forward.h"
     32 #include "wtf/PassRefPtr.h"
     33 #include "wtf/RefCounted.h"
     34 #include "wtf/Vector.h"
     35 
     36 namespace WebCore {
     37 
     38 class CSSSegmentedFontFace;
     39 class Document;
     40 class FontDescription;
     41 class SimpleFontData;
     42 class StyleRuleFontFace;
     43 
     44 // FIXME: Can this be a subclass of FontFace?
     45 class CSSFontFace : public RefCounted<CSSFontFace> {
     46 public:
     47     static PassRefPtr<CSSFontFace> create(PassRefPtr<FontFace> fontFace) { return adoptRef(new CSSFontFace(fontFace)); }
     48     static PassRefPtr<CSSFontFace> createFromStyleRule(Document*, const StyleRuleFontFace*);
     49 
     50     class UnicodeRangeSet;
     51 
     52     ~CSSFontFace();
     53 
     54     FontFace* fontFace() const { return m_fontFace.get(); }
     55 
     56     UnicodeRangeSet& ranges() { return m_ranges; }
     57 
     58     void setSegmentedFontFace(CSSSegmentedFontFace*);
     59     void clearSegmentedFontFace() { m_segmentedFontFace = 0; }
     60 
     61     bool isLoaded() const;
     62     bool isValid() const;
     63 
     64     void addSource(PassOwnPtr<CSSFontFaceSource>);
     65 
     66     void beginLoadIfNeeded(CSSFontFaceSource*);
     67     void fontLoaded(CSSFontFaceSource*);
     68 
     69     PassRefPtr<SimpleFontData> getFontData(const FontDescription&);
     70 
     71     struct UnicodeRange {
     72         UnicodeRange(UChar32 from, UChar32 to)
     73             : m_from(from)
     74             , m_to(to)
     75         {
     76         }
     77 
     78         UChar32 from() const { return m_from; }
     79         UChar32 to() const { return m_to; }
     80         bool contains(UChar32 c) const { return m_from <= c && c <= m_to; }
     81 
     82     private:
     83         UChar32 m_from;
     84         UChar32 m_to;
     85     };
     86 
     87     class UnicodeRangeSet {
     88     public:
     89         void add(UChar32 from, UChar32 to) { m_ranges.append(UnicodeRange(from, to)); }
     90         bool intersectsWith(const String&) const;
     91         bool isEntireRange() const { return m_ranges.isEmpty(); }
     92         size_t size() const { return m_ranges.size(); }
     93         const UnicodeRange& rangeAt(size_t i) const { return m_ranges[i]; }
     94     private:
     95         Vector<UnicodeRange> m_ranges; // If empty, represents the whole code space.
     96     };
     97 
     98     FontFace::LoadStatus loadStatus() const { return m_fontFace->loadStatus(); }
     99     void willUseFontData(const FontDescription&);
    100 
    101 private:
    102     CSSFontFace(PassRefPtr<FontFace> fontFace)
    103         : m_segmentedFontFace(0)
    104         , m_activeSource(0)
    105         , m_fontFace(fontFace)
    106     {
    107         ASSERT(m_fontFace);
    108     }
    109     void setLoadStatus(FontFace::LoadStatus);
    110 
    111     UnicodeRangeSet m_ranges;
    112     CSSSegmentedFontFace* m_segmentedFontFace;
    113     Vector<OwnPtr<CSSFontFaceSource> > m_sources;
    114     CSSFontFaceSource* m_activeSource;
    115     RefPtr<FontFace> m_fontFace;
    116 };
    117 
    118 }
    119 
    120 #endif
    121