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/*
* 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 <cmath>
namespace WebCore {
RenderMathMLPadded::RenderMathMLPadded(MathMLPaddedElement& element, RenderStyle&& style)
: RenderMathMLRow(element, WTFMove(style))
{
}
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());
// Determine the intrinsic width of the content.
RenderMathMLRow::computePreferredLogicalWidths();
// Only the width attribute should modify the width.
// We parse it using the preferred width of the content as its default value.
m_maxPreferredLogicalWidth = mpaddedWidth(m_maxPreferredLogicalWidth);
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth;
setPreferredLogicalWidthsDirty(false);
}
void RenderMathMLPadded::layoutBlock(bool relayoutChildren, LayoutUnit)
{
ASSERT(needsLayout());
if (!relayoutChildren && simplifiedLayout())
return;
// We first layout our children as a normal <mrow> element.
LayoutUnit contentAscent, contentDescent, contentWidth;
contentAscent = contentDescent = 0;
RenderMathMLRow::computeLineVerticalStretch(contentAscent, contentDescent);
RenderMathMLRow::layoutRowItems(contentAscent, contentDescent);
contentWidth = logicalWidth();
// 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)
LayoutPoint contentLocation(lspace(), ascent - contentAscent - voffset());
for (auto* child = firstChildBox(); child; child = child->nextSiblingBox())
child->setLocation(child->location() + contentLocation);
// Set the final metrics.
setLogicalWidth(width);
setLogicalHeight(ascent + descent);
clearNeedsLayout();
}
std::optional<int> RenderMathMLPadded::firstLineBaseline() const
{
// We try and calculate the baseline from the position of the first child.
LayoutUnit ascent;
if (auto* baselineChild = firstChildBox())
ascent = ascentForChild(*baselineChild) + baselineChild->logicalTop() + voffset();
else
ascent = mpaddedHeight(0);
return std::optional<int>(std::lround(static_cast<float>(ascent)));
}
}
#endif
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