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