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
37namespace blink {
38
39class FontDescription;
40class RemoteFontFaceSource;
41class SimpleFontData;
42
43class CSSFontFace FINAL : public NoBaseWillBeGarbageCollectedFinalized<CSSFontFace> {
44public:
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
112private:
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