1/*
2 * Copyright (C) 2016 Igalia S.L. 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "RenderMathMLPadded.h"
28
29#if ENABLE(MATHML)
30
31#include <cmath>
32#include <wtf/IsoMallocInlines.h>
33
34namespace WebCore {
35
36WTF_MAKE_ISO_ALLOCATED_IMPL(RenderMathMLPadded);
37
38RenderMathMLPadded::RenderMathMLPadded(MathMLPaddedElement& element, RenderStyle&& style)
39 : RenderMathMLRow(element, WTFMove(style))
40{
41}
42
43LayoutUnit RenderMathMLPadded::voffset() const
44{
45 return toUserUnits(element().voffset(), style(), 0);
46}
47
48LayoutUnit RenderMathMLPadded::lspace() const
49{
50 LayoutUnit lspace = toUserUnits(element().lspace(), style(), 0);
51 // FIXME: Negative lspace values are not supported yet (https://bugs.webkit.org/show_bug.cgi?id=85730).
52 return std::max<LayoutUnit>(0, lspace);
53}
54
55LayoutUnit RenderMathMLPadded::mpaddedWidth(LayoutUnit contentWidth) const
56{
57 return std::max<LayoutUnit>(0, toUserUnits(element().width(), style(), contentWidth));
58}
59
60LayoutUnit RenderMathMLPadded::mpaddedHeight(LayoutUnit contentHeight) const
61{
62 return std::max<LayoutUnit>(0, toUserUnits(element().height(), style(), contentHeight));
63}
64
65LayoutUnit RenderMathMLPadded::mpaddedDepth(LayoutUnit contentDepth) const
66{
67 return std::max<LayoutUnit>(0, toUserUnits(element().depth(), style(), contentDepth));
68}
69
70void RenderMathMLPadded::computePreferredLogicalWidths()
71{
72 ASSERT(preferredLogicalWidthsDirty());
73
74 // Determine the intrinsic width of the content.
75 RenderMathMLRow::computePreferredLogicalWidths();
76
77 // Only the width attribute should modify the width.
78 // We parse it using the preferred width of the content as its default value.
79 m_maxPreferredLogicalWidth = mpaddedWidth(m_maxPreferredLogicalWidth);
80 m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth;
81
82 setPreferredLogicalWidthsDirty(false);
83}
84
85void RenderMathMLPadded::layoutBlock(bool relayoutChildren, LayoutUnit)
86{
87 ASSERT(needsLayout());
88
89 if (!relayoutChildren && simplifiedLayout())
90 return;
91
92 // We first layout our children as a normal <mrow> element.
93 LayoutUnit contentWidth, contentAscent, contentDescent;
94 stretchVerticalOperatorsAndLayoutChildren();
95 getContentBoundingBox(contentWidth, contentAscent, contentDescent);
96 layoutRowItems(contentWidth, contentAscent);
97
98 // We parse the mpadded attributes using the content metrics as the default value.
99 LayoutUnit width = mpaddedWidth(contentWidth);
100 LayoutUnit ascent = mpaddedHeight(contentAscent);
101 LayoutUnit descent = mpaddedDepth(contentDescent);
102
103 // Align children on the new baseline and shift them by (lspace, -voffset)
104 LayoutPoint contentLocation(lspace(), ascent - contentAscent - voffset());
105 for (auto* child = firstChildBox(); child; child = child->nextSiblingBox())
106 child->setLocation(child->location() + contentLocation);
107
108 // Set the final metrics.
109 setLogicalWidth(width);
110 setLogicalHeight(ascent + descent);
111
112 layoutPositionedObjects(relayoutChildren);
113
114 updateScrollInfoAfterLayout();
115
116 clearNeedsLayout();
117}
118
119Optional<int> RenderMathMLPadded::firstLineBaseline() const
120{
121 // We try and calculate the baseline from the position of the first child.
122 LayoutUnit ascent;
123 if (auto* baselineChild = firstChildBox())
124 ascent = ascentForChild(*baselineChild) + baselineChild->logicalTop() + voffset();
125 else
126 ascent = mpaddedHeight(0);
127 return Optional<int>(std::lround(static_cast<float>(ascent)));
128}
129
130}
131
132#endif
133