1/*
2 * Copyright (C) 2016 Igalia S.L. All rights reserved.
3 * Copyright (C) 2016 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#if ENABLE(MATHML)
30
31#include "GlyphPage.h"
32#include "LayoutUnit.h"
33#include "OpenTypeMathData.h"
34#include "PaintInfo.h"
35#include <unicode/utypes.h>
36
37namespace WebCore {
38
39class RenderStyle;
40
41class MathOperator {
42public:
43 MathOperator();
44 enum class Type { NormalOperator, DisplayOperator, VerticalOperator, HorizontalOperator };
45 void setOperator(const RenderStyle&, UChar32 baseCharacter, Type);
46 void reset(const RenderStyle&);
47
48 LayoutUnit width() const { return m_width; }
49 LayoutUnit maxPreferredWidth() const { return m_maxPreferredWidth; }
50 LayoutUnit ascent() const { return m_ascent; }
51 LayoutUnit descent() const { return m_descent; }
52 LayoutUnit italicCorrection() const { return m_italicCorrection; }
53
54 void stretchTo(const RenderStyle&, LayoutUnit ascent, LayoutUnit descent);
55 void stretchTo(const RenderStyle&, LayoutUnit width);
56
57 void paint(const RenderStyle&, PaintInfo&, const LayoutPoint&);
58
59private:
60 struct GlyphAssemblyData {
61 UChar32 topOrRightCodePoint { 0 };
62 Glyph topOrRightFallbackGlyph { 0 };
63 UChar32 extensionCodePoint { 0 };
64 Glyph extensionFallbackGlyph { 0 };
65 UChar32 bottomOrLeftCodePoint { 0 };
66 Glyph bottomOrLeftFallbackGlyph { 0 };
67 UChar32 middleCodePoint { 0 };
68 Glyph middleFallbackGlyph { 0 };
69
70 bool hasExtension() const { return extensionCodePoint || extensionFallbackGlyph; }
71 bool hasMiddle() const { return middleCodePoint || middleFallbackGlyph; }
72 void initialize();
73 };
74 enum class StretchType { Unstretched, SizeVariant, GlyphAssembly };
75 enum GlyphPaintTrimming {
76 TrimTop,
77 TrimBottom,
78 TrimTopAndBottom,
79 TrimLeft,
80 TrimRight,
81 TrimLeftAndRight
82 };
83
84 LayoutUnit stretchSize() const;
85 bool getGlyph(const RenderStyle&, UChar32 character, GlyphData&) const;
86 bool getBaseGlyph(const RenderStyle& style, GlyphData& baseGlyph) const { return getGlyph(style, m_baseCharacter, baseGlyph); }
87 void setSizeVariant(const GlyphData&);
88 void setGlyphAssembly(const RenderStyle&, const GlyphAssemblyData&);
89 void getMathVariantsWithFallback(const RenderStyle&, bool isVertical, Vector<Glyph>&, Vector<OpenTypeMathData::AssemblyPart>&);
90 void calculateDisplayStyleLargeOperator(const RenderStyle&);
91 void calculateStretchyData(const RenderStyle&, bool calculateMaxPreferredWidth, LayoutUnit targetSize = 0_lu);
92 bool calculateGlyphAssemblyFallback(const Vector<OpenTypeMathData::AssemblyPart>&, GlyphAssemblyData&) const;
93
94 LayoutRect paintGlyph(const RenderStyle&, PaintInfo&, const GlyphData&, const LayoutPoint& origin, GlyphPaintTrimming);
95 void fillWithVerticalExtensionGlyph(const RenderStyle&, PaintInfo&, const LayoutPoint& from, const LayoutPoint& to);
96 void fillWithHorizontalExtensionGlyph(const RenderStyle&, PaintInfo&, const LayoutPoint& from, const LayoutPoint& to);
97 void paintVerticalGlyphAssembly(const RenderStyle&, PaintInfo&, const LayoutPoint&);
98 void paintHorizontalGlyphAssembly(const RenderStyle&, PaintInfo&, const LayoutPoint&);
99
100 UChar32 m_baseCharacter { 0 };
101 Type m_operatorType { Type::NormalOperator };
102 StretchType m_stretchType { StretchType::Unstretched };
103 union {
104 Glyph m_variantGlyph;
105 GlyphAssemblyData m_assembly;
106 };
107 LayoutUnit m_maxPreferredWidth { 0 };
108 LayoutUnit m_width { 0 };
109 LayoutUnit m_ascent { 0 };
110 LayoutUnit m_descent { 0 };
111 LayoutUnit m_italicCorrection { 0 };
112 float m_radicalVerticalScale { 1 };
113};
114
115}
116
117#endif // ENABLE(MATHML)
118