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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
* Copyright (C) 2010 François Sausset (sausset@gmail.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(MATHML)
#include "RenderMathMLFraction.h"
#include "GraphicsContext.h"
#include "MathMLNames.h"
#include "PaintInfo.h"
#include "RenderText.h"
namespace WebCore {
using namespace MathMLNames;
static const float gHorizontalPad = 0.2f;
static const float gLineThin = 0.33f;
static const float gLineMedium = 1.f;
static const float gLineThick = 3.f;
static const float gFractionBarWidth = 0.05f;
static const float gDenominatorPad = 0.1f;
RenderMathMLFraction::RenderMathMLFraction(Element* fraction)
: RenderMathMLBlock(fraction)
, m_lineThickness(gLineMedium)
{
setChildrenInline(false);
}
void RenderMathMLFraction::updateFromElement()
{
// FIXME: mfrac where bevelled=true will need to reorganize the descendants
if (isEmpty())
return;
Element* fraction = static_cast<Element*>(node());
RenderObject* numerator = firstChild();
String nalign = fraction->getAttribute(MathMLNames::numalignAttr);
if (equalIgnoringCase(nalign, "left"))
numerator->style()->setTextAlign(LEFT);
else if (equalIgnoringCase(nalign, "right"))
numerator->style()->setTextAlign(RIGHT);
else
numerator->style()->setTextAlign(CENTER);
RenderObject* denominator = numerator->nextSibling();
if (!denominator)
return;
String dalign = fraction->getAttribute(MathMLNames::denomalignAttr);
if (equalIgnoringCase(dalign, "left"))
denominator->style()->setTextAlign(LEFT);
else if (equalIgnoringCase(dalign, "right"))
denominator->style()->setTextAlign(RIGHT);
else
denominator->style()->setTextAlign(CENTER);
// FIXME: parse units
String thickness = fraction->getAttribute(MathMLNames::linethicknessAttr);
m_lineThickness = gLineMedium;
if (equalIgnoringCase(thickness, "thin"))
m_lineThickness = gLineThin;
else if (equalIgnoringCase(thickness, "medium"))
m_lineThickness = gLineMedium;
else if (equalIgnoringCase(thickness, "thick"))
m_lineThickness = gLineThick;
else if (equalIgnoringCase(thickness, "0"))
m_lineThickness = 0;
// Update the style for the padding of the denominator for the line thickness
lastChild()->style()->setPaddingTop(Length(static_cast<int>(m_lineThickness + style()->fontSize() * gDenominatorPad), Fixed));
}
void RenderMathMLFraction::addChild(RenderObject* child, RenderObject* beforeChild)
{
RenderBlock* row = new (renderArena()) RenderMathMLBlock(node());
RefPtr<RenderStyle> rowStyle = makeBlockStyle();
rowStyle->setTextAlign(CENTER);
Length pad(static_cast<int>(rowStyle->fontSize() * gHorizontalPad), Fixed);
rowStyle->setPaddingLeft(pad);
rowStyle->setPaddingRight(pad);
// Only add padding for rows as denominators
bool isNumerator = isEmpty();
if (!isNumerator)
rowStyle->setPaddingTop(Length(2, Fixed));
row->setStyle(rowStyle.release());
RenderBlock::addChild(row, beforeChild);
row->addChild(child);
updateFromElement();
}
void RenderMathMLFraction::layout()
{
updateFromElement();
// Adjust the fraction line thickness for the zoom
if (lastChild() && lastChild()->isRenderBlock())
m_lineThickness *= ceilf(gFractionBarWidth * style()->fontSize());
RenderBlock::layout();
}
void RenderMathMLFraction::paint(PaintInfo& info, int tx, int ty)
{
RenderMathMLBlock::paint(info, tx, ty);
if (info.context->paintingDisabled() || info.phase != PaintPhaseForeground)
return;
if (!firstChild() ||!m_lineThickness)
return;
int verticalOffset = 0;
// The children are always RenderMathMLBlock instances
if (firstChild()->isRenderMathMLBlock()) {
int adjustForThickness = m_lineThickness > 1 ? int(m_lineThickness / 2) : 1;
if (int(m_lineThickness) % 2 == 1)
adjustForThickness++;
RenderMathMLBlock* numerator = toRenderMathMLBlock(firstChild());
if (numerator->isRenderMathMLRow())
verticalOffset = numerator->offsetHeight() + adjustForThickness;
else
verticalOffset = numerator->offsetHeight();
}
tx += x();
ty += y() + verticalOffset;
info.context->save();
info.context->setStrokeThickness(m_lineThickness);
info.context->setStrokeStyle(SolidStroke);
info.context->setStrokeColor(style()->visitedDependentColor(CSSPropertyColor), ColorSpaceSRGB);
info.context->drawLine(IntPoint(tx, ty), IntPoint(tx + offsetWidth(), ty));
info.context->restore();
}
int RenderMathMLFraction::baselinePosition(FontBaseline, bool firstLine, LineDirectionMode lineDirection, LinePositionMode linePositionMode) const
{
if (firstChild() && firstChild()->isRenderMathMLBlock()) {
RenderMathMLBlock* numerator = toRenderMathMLBlock(firstChild());
RenderStyle* refStyle = style();
if (previousSibling())
refStyle = previousSibling()->style();
else if (nextSibling())
refStyle = nextSibling()->style();
int shift = int(ceil((refStyle->font().xHeight() + 1) / 2));
return numerator->offsetHeight() + shift;
}
return RenderBlock::baselinePosition(AlphabeticBaseline, firstLine, lineDirection, linePositionMode);
}
}
#endif // ENABLE(MATHML)
|
