1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*
* Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include "InlineIteratorSVGTextBox.h"
#include "Path.h"
#include "SVGTextChunkBuilder.h"
#include "SVGTextFragment.h"
#include "SVGTextLayoutAttributes.h"
namespace WebCore {
class RenderObject;
class RenderStyle;
class RenderSVGInlineText;
class RenderSVGTextPath;
class SVGElement;
class SVGInlineTextBox;
class SVGRenderStyle;
// SVGTextLayoutEngine performs the second layout phase for SVG text.
//
// The InlineBox tree was created, containing the text chunk information, necessary to apply
// certain SVG specific text layout properties (text-length adjustments and text-anchor).
// The second layout phase uses the SVGTextLayoutAttributes stored in the individual
// RenderSVGInlineText renderers to compute the final positions for each character
// which are stored in the SVGInlineTextBox objects.
class SVGTextLayoutEngine {
public:
SVGTextLayoutEngine(Vector<SVGTextLayoutAttributes*>&);
SVGTextLayoutEngine(SVGTextLayoutEngine&&) = default;
SVGTextLayoutEngine(const SVGTextLayoutEngine&) = delete;
Vector<SVGTextLayoutAttributes*>& layoutAttributes() { return m_layoutAttributes; }
void beginTextPathLayout(const RenderSVGTextPath&, SVGTextLayoutEngine& lineLayout);
void endTextPathLayout();
void layoutInlineTextBox(InlineIterator::SVGTextBoxIterator);
SVGTextFragmentMap finishLayout();
private:
void updateCharacterPositionIfNeeded(float& x, float& y);
void updateCurrentTextPosition(float x, float y, float glyphAdvance);
void updateRelativePositionAdjustmentsIfNeeded(float dx, float dy);
void recordTextFragment(InlineIterator::SVGTextBoxIterator, const Vector<SVGTextMetrics>&);
bool parentDefinesTextLength(RenderObject*) const;
void layoutTextOnLineOrPath(InlineIterator::SVGTextBoxIterator, const RenderSVGInlineText&, const RenderStyle&);
void finalizeTransformMatrices(Vector<InlineIterator::SVGTextBoxIterator>&);
bool currentLogicalCharacterAttributes(SVGTextLayoutAttributes*&);
bool currentLogicalCharacterMetrics(SVGTextLayoutAttributes*&, SVGTextMetrics&);
bool currentVisualCharacterMetrics(const InlineIterator::SVGTextBox&, const Vector<SVGTextMetrics>&, SVGTextMetrics&);
void advanceToNextLogicalCharacter(const SVGTextMetrics&);
void advanceToNextVisualCharacter(const SVGTextMetrics&);
private:
Vector<SVGTextLayoutAttributes*>& m_layoutAttributes;
Vector<InlineIterator::SVGTextBoxIterator> m_lineLayoutBoxes;
Vector<InlineIterator::SVGTextBoxIterator> m_pathLayoutBoxes;
// Output.
UncheckedKeyHashMap<InlineIterator::SVGTextBox::Key, Vector<SVGTextFragment>> m_fragmentMap;
SVGTextChunkBuilder m_chunkLayoutBuilder;
UncheckedKeyHashSet<InlineIterator::SVGTextBox::Key> m_lineLayoutChunkStarts;
SVGTextFragment m_currentTextFragment;
unsigned m_layoutAttributesPosition { 0 };
unsigned m_logicalCharacterOffset { 0 };
unsigned m_logicalMetricsListOffset { 0 };
unsigned m_visualCharacterOffset { 0 };
unsigned m_visualMetricsListOffset { 0 };
float m_x { 0.0f };
float m_y { 0.0f };
float m_dx { 0.0f };
float m_dy { 0.0f };
float m_lastChunkStartPosition { 0.0f };
bool m_lastChunkHasTextLength { false };
bool m_lastChunkIsVerticalText { false };
bool m_isVerticalText { false };
bool m_inPathLayout { false };
// Text on path layout
Path m_textPath;
float m_textPathLength { 0.0f };
float m_textPathStartOffset { 0.0f };
float m_textPathCurrentOffset { 0.0f };
float m_textPathSpacing { 0.0f };
float m_textPathScaling { 1.0f };
};
} // namespace WebCore
|
