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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/CSSSegmentedFontFace.h"
     31 #include "core/css/FontFace.h"
     32 #include "wtf/Deque.h"
     33 #include "wtf/Forward.h"
     34 #include "wtf/PassRefPtr.h"
     35 #include "wtf/Vector.h"
     36 
     37 namespace WebCore {
     38 
     39 class CSSFontSelector;
     40 class Document;
     41 class FontDescription;
     42 class RemoteFontFaceSource;
     43 class SimpleFontData;
     44 class StyleRuleFontFace;
     45 
     46 class CSSFontFace FINAL : public NoBaseWillBeGarbageCollectedFinalized<CSSFontFace> {
     47 public:
     48     struct UnicodeRange;
     49     class UnicodeRangeSet;
     50 
     51     CSSFontFace(FontFace* fontFace, Vector<UnicodeRange>& ranges)
     52         : m_ranges(ranges)
     53         , m_segmentedFontFace(nullptr)
     54         , m_fontFace(fontFace)
     55     {
     56         ASSERT(m_fontFace);
     57     }
     58 
     59     FontFace* fontFace() const { return m_fontFace; }
     60 
     61     UnicodeRangeSet& ranges() { return m_ranges; }
     62 
     63     void setSegmentedFontFace(CSSSegmentedFontFace*);
     64     void clearSegmentedFontFace() { m_segmentedFontFace = nullptr; }
     65 
     66     bool isValid() const { return !m_sources.isEmpty(); }
     67 
     68     void addSource(PassOwnPtrWillBeRawPtr<CSSFontFaceSource>);
     69 
     70     void didBeginLoad();
     71     void fontLoaded(RemoteFontFaceSource*);
     72     void fontLoadWaitLimitExceeded(RemoteFontFaceSource*);
     73 
     74     PassRefPtr<SimpleFontData> getFontData(const FontDescription&);
     75 
     76     struct UnicodeRange {
     77         UnicodeRange(UChar32 from, UChar32 to)
     78             : m_from(from)
     79             , m_to(to)
     80         {
     81         }
     82 
     83         UChar32 from() const { return m_from; }
     84         UChar32 to() const { return m_to; }
     85         bool contains(UChar32 c) const { return m_from <= c && c <= m_to; }
     86         bool operator<(const UnicodeRange& other) const { return m_from < other.m_from; }
     87         bool operator<(UChar32 c) const { return m_to < c; }
     88 
     89     private:
     90         UChar32 m_from;
     91         UChar32 m_to;
     92     };
     93 
     94     class UnicodeRangeSet {
     95     public:
     96         explicit UnicodeRangeSet(const Vector<UnicodeRange>&);
     97         bool contains(UChar32) const;
     98         bool intersectsWith(const String&) const;
     99         bool isEntireRange() const { return m_ranges.isEmpty(); }
    100         size_t size() const { return m_ranges.size(); }
    101         const UnicodeRange& rangeAt(size_t i) const { return m_ranges[i]; }
    102     private:
    103         Vector<UnicodeRange> m_ranges; // If empty, represents the whole code space.
    104     };
    105 
    106     FontFace::LoadStatus loadStatus() const { return m_fontFace->loadStatus(); }
    107     bool maybeScheduleFontLoad(const FontDescription&, UChar32);
    108     void load();
    109     void load(const FontDescription&);
    110 
    111     bool hadBlankText() { return isValid() && m_sources.first()->hadBlankText(); }
    112 
    113     void trace(Visitor*);
    114 
    115 private:
    116     void setLoadStatus(FontFace::LoadStatus);
    117 
    118     UnicodeRangeSet m_ranges;
    119     RawPtrWillBeMember<CSSSegmentedFontFace> m_segmentedFontFace;
    120     WillBeHeapDeque<OwnPtrWillBeMember<CSSFontFaceSource> > m_sources;
    121     RawPtrWillBeMember<FontFace> m_fontFace;
    122 };
    123 
    124 }
    125 
    126 #endif
    127