1 | /* |
2 | * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 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. AND ITS CONTRIBUTORS ``AS IS'' |
14 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
15 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
17 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
18 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
19 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
20 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
21 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
22 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
23 | * THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #pragma once |
27 | |
28 | #if ENABLE(TEXT_AUTOSIZING) |
29 | |
30 | #include "RenderStyle.h" |
31 | #include <wtf/HashMap.h> |
32 | #include <wtf/HashSet.h> |
33 | #include <wtf/RefCounted.h> |
34 | #include <wtf/RefPtr.h> |
35 | |
36 | namespace WebCore { |
37 | |
38 | class Document; |
39 | class Text; |
40 | |
41 | // FIXME: We can probably get rid of this class entirely and use std::unique_ptr<RenderStyle> as key |
42 | // as long as we use the right hash traits. |
43 | class TextAutoSizingKey { |
44 | public: |
45 | TextAutoSizingKey() = default; |
46 | enum DeletedTag { Deleted }; |
47 | explicit TextAutoSizingKey(DeletedTag); |
48 | TextAutoSizingKey(const RenderStyle&, unsigned hash); |
49 | |
50 | const RenderStyle* style() const { ASSERT(!isDeleted()); return m_style.get(); } |
51 | bool isDeleted() const { return HashTraits<std::unique_ptr<RenderStyle>>::isDeletedValue(m_style); } |
52 | |
53 | unsigned hash() const { return m_hash; } |
54 | |
55 | private: |
56 | std::unique_ptr<RenderStyle> m_style; |
57 | unsigned m_hash { 0 }; |
58 | }; |
59 | |
60 | inline bool operator==(const TextAutoSizingKey& a, const TextAutoSizingKey& b) |
61 | { |
62 | if (a.isDeleted() || b.isDeleted()) |
63 | return false; |
64 | if (!a.style() || !b.style()) |
65 | return a.style() == b.style(); |
66 | return a.style()->equalForTextAutosizing(*b.style()); |
67 | } |
68 | |
69 | struct TextAutoSizingHash { |
70 | static unsigned hash(const TextAutoSizingKey& key) { return key.hash(); } |
71 | static bool equal(const TextAutoSizingKey& a, const TextAutoSizingKey& b) { return a == b; } |
72 | static const bool safeToCompareToEmptyOrDeleted = true; |
73 | }; |
74 | |
75 | struct TextAutoSizingHashTranslator { |
76 | static unsigned hash(const RenderStyle& style) |
77 | { |
78 | return style.hashForTextAutosizing(); |
79 | } |
80 | |
81 | static bool equal(const TextAutoSizingKey& key, const RenderStyle& style) |
82 | { |
83 | if (key.isDeleted() || !key.style()) |
84 | return false; |
85 | return key.style()->equalForTextAutosizing(style); |
86 | } |
87 | |
88 | static void translate(TextAutoSizingKey& key, const RenderStyle& style, unsigned hash) |
89 | { |
90 | key = { style, hash }; |
91 | } |
92 | }; |
93 | |
94 | class TextAutoSizingValue { |
95 | WTF_MAKE_FAST_ALLOCATED; |
96 | public: |
97 | TextAutoSizingValue() = default; |
98 | ~TextAutoSizingValue(); |
99 | |
100 | void addTextNode(Text&, float size); |
101 | |
102 | enum class StillHasNodes { No, Yes }; |
103 | StillHasNodes adjustTextNodeSizes(); |
104 | |
105 | private: |
106 | void reset(); |
107 | |
108 | HashSet<RefPtr<Text>> m_autoSizedNodes; |
109 | }; |
110 | |
111 | struct TextAutoSizingTraits : WTF::GenericHashTraits<TextAutoSizingKey> { |
112 | static const bool emptyValueIsZero = true; |
113 | static void constructDeletedValue(TextAutoSizingKey& slot) { new (NotNull, &slot) TextAutoSizingKey(TextAutoSizingKey::Deleted); } |
114 | static bool isDeletedValue(const TextAutoSizingKey& value) { return value.isDeleted(); } |
115 | }; |
116 | |
117 | class TextAutoSizing { |
118 | WTF_MAKE_FAST_ALLOCATED; |
119 | public: |
120 | TextAutoSizing() = default; |
121 | |
122 | void addTextNode(Text&, float size); |
123 | void updateRenderTree(); |
124 | void reset(); |
125 | |
126 | private: |
127 | HashMap<TextAutoSizingKey, std::unique_ptr<TextAutoSizingValue>, TextAutoSizingHash, TextAutoSizingTraits> m_textNodes; |
128 | }; |
129 | |
130 | } // namespace WebCore |
131 | |
132 | #endif // ENABLE(TEXT_AUTOSIZING) |
133 | |