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 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 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#pragma once
27
28#include "CSSFontFace.h"
29#include "CSSFontFaceSet.h"
30#include "CachedResourceHandle.h"
31#include "Font.h"
32#include "FontSelector.h"
33#include "Timer.h"
34#include <memory>
35#include <wtf/Forward.h>
36#include <wtf/HashSet.h>
37#include <wtf/RefPtr.h>
38#include <wtf/text/StringHash.h>
39
40namespace WebCore {
41
42class CSSFontFaceRule;
43class CSSPrimitiveValue;
44class CSSSegmentedFontFace;
45class CSSValueList;
46class CachedFont;
47class Document;
48class StyleRuleFontFace;
49
50class CSSFontSelector final : public FontSelector, public CSSFontFaceSetClient, public CanMakeWeakPtr<CSSFontSelector> {
51public:
52 static Ref<CSSFontSelector> create(Document& document)
53 {
54 return adoptRef(*new CSSFontSelector(document));
55 }
56 virtual ~CSSFontSelector();
57
58 unsigned version() const final { return m_version; }
59 unsigned uniqueId() const final { return m_uniqueId; }
60
61 FontRanges fontRangesForFamily(const FontDescription&, const AtomicString&) final;
62 size_t fallbackFontCount() final;
63 RefPtr<Font> fallbackFontAt(const FontDescription&, size_t) final;
64
65 void clearDocument();
66 void emptyCaches();
67 void buildStarted();
68 void buildCompleted();
69
70 void addFontFaceRule(StyleRuleFontFace&, bool isInitiatingElementInUserAgentShadowTree);
71
72 void fontLoaded();
73 void fontCacheInvalidated() final;
74
75 bool isEmpty() const;
76
77 void registerForInvalidationCallbacks(FontSelectorClient&) final;
78 void unregisterForInvalidationCallbacks(FontSelectorClient&) final;
79
80 Document* document() const { return m_document.get(); }
81
82 void beginLoadingFontSoon(CachedFont&);
83
84 FontFaceSet& fontFaceSet();
85
86 void incrementIsComputingRootStyleFont() { ++m_computingRootStyleFontCount; }
87 void decrementIsComputingRootStyleFont() { --m_computingRootStyleFontCount; }
88
89private:
90 explicit CSSFontSelector(Document&);
91
92 void dispatchInvalidationCallbacks();
93
94 void opportunisticallyStartFontDataURLLoading(const FontCascadeDescription&, const AtomicString& family) final;
95
96 void fontModified() final;
97
98 void beginLoadTimerFired();
99
100 struct PendingFontFaceRule {
101 StyleRuleFontFace& styleRuleFontFace;
102 bool isInitiatingElementInUserAgentShadowTree;
103 };
104 Vector<PendingFontFaceRule> m_stagingArea;
105
106 WeakPtr<Document> m_document;
107 RefPtr<FontFaceSet> m_fontFaceSet;
108 Ref<CSSFontFaceSet> m_cssFontFaceSet;
109 HashSet<FontSelectorClient*> m_clients;
110
111 Vector<CachedResourceHandle<CachedFont>> m_fontsToBeginLoading;
112 HashSet<RefPtr<CSSFontFace>> m_cssConnectionsPossiblyToRemove;
113 HashSet<RefPtr<StyleRuleFontFace>> m_cssConnectionsEncounteredDuringBuild;
114 Timer m_beginLoadingTimer;
115
116 unsigned m_uniqueId;
117 unsigned m_version;
118 unsigned m_computingRootStyleFontCount { 0 };
119 bool m_creatingFont { false };
120 bool m_buildIsUnderway { false };
121};
122
123} // namespace WebCore
124