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
|
/*
* Copyright (C) 2016 Igalia S.L. 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"
#include "RenderMathMLPadded.h"
#if ENABLE(MATHML)
#include "RenderMathMLBlockInlines.h"
#include <cmath>
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(RenderMathMLPadded);
RenderMathMLPadded::RenderMathMLPadded(MathMLPaddedElement& element, RenderStyle&& style)
: RenderMathMLRow(Type::MathMLPadded, element, WTFMove(style))
{
ASSERT(isRenderMathMLPadded());
}
RenderMathMLPadded::~RenderMathMLPadded() = default;
LayoutUnit RenderMathMLPadded::voffset() const
{
return toUserUnits(element().voffset(), style(), 0);
}
LayoutUnit RenderMathMLPadded::lspace() const
{
LayoutUnit lspace = toUserUnits(element().lspace(), style(), 0);
// FIXME: Negative lspace values are not supported yet (https://bugs.webkit.org/show_bug.cgi?id=85730).
return std::max<LayoutUnit>(0, lspace);
}
LayoutUnit RenderMathMLPadded::mpaddedWidth(LayoutUnit contentWidth) const
{
return std::max<LayoutUnit>(0, toUserUnits(element().width(), style(), contentWidth));
}
LayoutUnit RenderMathMLPadded::mpaddedHeight(LayoutUnit contentHeight) const
{
return std::max<LayoutUnit>(0, toUserUnits(element().height(), style(), contentHeight));
}
LayoutUnit RenderMathMLPadded::mpaddedDepth(LayoutUnit contentDepth) const
{
return std::max<LayoutUnit>(0, toUserUnits(element().depth(), style(), contentDepth));
}
void RenderMathMLPadded::computePreferredLogicalWidths()
{
ASSERT(preferredLogicalWidthsDirty());
// Only the width attribute should modify the width.
// We parse it using the preferred width of the content as its default value.
LayoutUnit preferredWidth = preferredLogicalWidthOfRowItems();
preferredWidth = mpaddedWidth(preferredWidth);
m_maxPreferredLogicalWidth = m_minPreferredLogicalWidth = preferredWidth;
auto sizes = sizeAppliedToMathContent(LayoutPhase::CalculatePreferredLogicalWidth);
applySizeToMathContent(LayoutPhase::CalculatePreferredLogicalWidth, sizes);
adjustPreferredLogicalWidthsForBorderAndPadding();
setPreferredLogicalWidthsDirty(false);
}
void RenderMathMLPadded::layoutBlock(RelayoutChildren relayoutChildren, LayoutUnit)
{
ASSERT(needsLayout());
insertPositionedChildrenIntoContainingBlock();
if (relayoutChildren == RelayoutChildren::No && simplifiedLayout())
return;
layoutFloatingChildren();
recomputeLogicalWidth();
computeAndSetBlockDirectionMarginsOfChildren();
// We first layout our children as a normal <mrow> element.
LayoutUnit contentWidth, contentAscent, contentDescent;
stretchVerticalOperatorsAndLayoutChildren();
getContentBoundingBox(contentWidth, contentAscent, contentDescent);
layoutRowItems(contentWidth, contentAscent);
// We parse the mpadded attributes using the content metrics as the default value.
LayoutUnit width = mpaddedWidth(contentWidth);
LayoutUnit ascent = mpaddedHeight(contentAscent);
LayoutUnit descent = mpaddedDepth(contentDescent);
// Align children on the new baseline and shift them by (lspace, -voffset)
shiftInFlowChildren(lspace(), ascent - contentAscent - voffset());
// Set the final metrics.
setLogicalWidth(width);
setLogicalHeight(ascent + descent);
auto sizes = sizeAppliedToMathContent(LayoutPhase::Layout);
auto shift = applySizeToMathContent(LayoutPhase::Layout, sizes);
shiftInFlowChildren(shift, 0);
adjustLayoutForBorderAndPadding();
layoutPositionedObjects(relayoutChildren);
updateScrollInfoAfterLayout();
clearNeedsLayout();
}
std::optional<LayoutUnit> RenderMathMLPadded::firstLineBaseline() const
{
// We try and calculate the baseline from the position of the first child.
LayoutUnit ascent;
if (auto* baselineChild = firstInFlowChildBox())
ascent = ascentForChild(*baselineChild) + baselineChild->logicalTop() + voffset();
else
ascent = mpaddedHeight(0);
return ascent;
}
}
#endif
|
