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/*
* Copyright (C) 2016 Igalia S.L. All rights reserved.
* Copyright (C) 2025 Apple Inc. 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_ALLOCATED_IMPL(RenderMathMLPadded);
RenderMathMLPadded::RenderMathMLPadded(MathMLPaddedElement& element, RenderStyle&& style)
: RenderMathMLRow(Type::MathMLPadded, element, WTF::move(style))
{
ASSERT(isRenderMathMLPadded());
}
RenderMathMLPadded::~RenderMathMLPadded() = default;
MathMLPaddedElement& RenderMathMLPadded::element() const
{
return static_cast<MathMLPaddedElement&>(nodeForNonAnonymous());
}
LayoutUnit RenderMathMLPadded::voffset() const
{
return toUserUnits(element().voffset(), style(), 0);
}
LayoutUnit RenderMathMLPadded::lspace() const
{
// FIXME: Negative lspace values are not supported yet (https://bugs.webkit.org/show_bug.cgi?id=85730).
return std::max(0_lu, toUserUnits(element().lspace(), style(), 0));
}
LayoutUnit RenderMathMLPadded::mpaddedWidth(LayoutUnit contentWidth) const
{
auto& widthAttr = element().width();
// If parsing failed (attribute not set) or it's a percentage, use the content width as default.
if (widthAttr.type == MathMLElement::LengthType::ParsingFailed || widthAttr.type == MathMLElement::LengthType::Percentage)
return contentWidth;
return std::max(0_lu, toUserUnits(widthAttr, style(), 0));
}
LayoutUnit RenderMathMLPadded::mpaddedHeight(LayoutUnit contentHeight) const
{
auto& heightAttr = element().height();
// If parsing failed (attribute not set) or it's a percentage, use the content height as default.
if (heightAttr.type == MathMLElement::LengthType::ParsingFailed || heightAttr.type == MathMLElement::LengthType::Percentage)
return contentHeight;
return std::max(0_lu, toUserUnits(heightAttr, style(), 0));
}
LayoutUnit RenderMathMLPadded::mpaddedDepth(LayoutUnit contentDepth) const
{
auto& depthAttr = element().depth();
// If parsing failed (attribute not set) or it's a percentage, use the content depth as default.
if (depthAttr.type == MathMLElement::LengthType::ParsingFailed || depthAttr.type == MathMLElement::LengthType::Percentage)
return contentDepth;
return std::max(0_lu, toUserUnits(depthAttr, style(), 0));
}
void RenderMathMLPadded::computePreferredLogicalWidths()
{
ASSERT(needsPreferredLogicalWidthsUpdate());
// 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();
clearNeedsPreferredWidthsUpdate();
}
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);
auto inlineShift = style().writingMode().inlineDirection() == FlowDirection::RightToLeft ? (width - contentWidth - lspace()) : lspace();
// Align children on the new baseline and shift them by (lspace, -voffset)
shiftInFlowChildren(inlineShift, 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();
layoutOutOfFlowBoxes(relayoutChildren);
}
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
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