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/*
* Copyright (C) 2018-2022 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 APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "PlacedFloats.h"
#include "LayoutContainingBlockChainIterator.h"
#include "LayoutInitialContainingBlock.h"
#include "LayoutShape.h"
#include "RenderStyleInlines.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(PlacedFloats);
PlacedFloats::Item::Item(const Box& layoutBox, Position position, const BoxGeometry& absoluteBoxGeometry, LayoutPoint localTopLeft, std::optional<size_t> line)
: m_layoutBox(layoutBox)
, m_position(position)
, m_absoluteBoxGeometry(absoluteBoxGeometry)
, m_localTopLeft(localTopLeft)
, m_shape(layoutBox.shape())
, m_placedByLine(line)
{
}
PlacedFloats::Item::Item(Position position, const BoxGeometry& absoluteBoxGeometry, LayoutPoint localTopLeft, const LayoutShape* shape)
: m_position(position)
, m_absoluteBoxGeometry(absoluteBoxGeometry)
, m_localTopLeft(localTopLeft)
, m_shape(shape)
{
}
BoxGeometry PlacedFloats::Item::boxGeometry() const
{
auto boxGeometry = BoxGeometry { m_absoluteBoxGeometry };
boxGeometry.setTopLeft(m_localTopLeft);
return boxGeometry;
}
PlacedFloats::Item::~Item() = default;
PlacedFloats::PlacedFloats(const ElementBox& blockFormattingContextRoot)
: m_blockFormattingContextRoot(blockFormattingContextRoot)
, m_writingMode(blockFormattingContextRoot.writingMode())
{
ASSERT(blockFormattingContextRoot.establishesBlockFormattingContext());
}
void PlacedFloats::append(Item newFloatItem)
{
auto isStartPositioned = newFloatItem.isStartPositioned();
m_positionTypes.add(isStartPositioned ? PositionType::Start : PositionType::End);
if (m_list.isEmpty())
return m_list.append(newFloatItem);
// The integration codepath does not construct a layout box for the float item.
ASSERT_IMPLIES(newFloatItem.layoutBox(), m_list.findIf([&] (auto& entry) {
return entry.layoutBox() == newFloatItem.layoutBox();
}) == notFound);
// When adding a new float item to the list, we have to ensure that it is definitely the left(right)-most item.
// Normally it is, but negative inline-axis margins can push the float box beyond another float box.
// Float items in m_list list should stay in inline-axis position order (left/right edge) on the same block-axis position.
auto inlineAxisMargin = newFloatItem.inlineAxisMargin();
auto hasNegativeInlineAxisMargin = (isStartPositioned && inlineAxisMargin.start < 0) || (!isStartPositioned && inlineAxisMargin.end < 0);
if (!hasNegativeInlineAxisMargin)
return m_list.append(newFloatItem);
for (size_t i = m_list.size(); i--;) {
auto& floatItem = m_list[i];
if (isStartPositioned != floatItem.isStartPositioned())
continue;
auto isInlineAxisOrdered = [&] {
if (newFloatItem.absoluteRectWithMargin().top() > floatItem.absoluteRectWithMargin().top()) {
// There's no more floats on this block axis position.
return true;
}
return (isStartPositioned && newFloatItem.absoluteRectWithMargin().right() >= floatItem.absoluteRectWithMargin().right())
|| (!isStartPositioned && newFloatItem.absoluteRectWithMargin().left() <= floatItem.absoluteRectWithMargin().left());
};
if (isInlineAxisOrdered())
return m_list.insert(i + 1, newFloatItem);
}
m_list.insert(0, newFloatItem);
}
bool PlacedFloats::Item::isInFormattingContextOf(const ElementBox& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
ASSERT(!is<InitialContainingBlock>(m_layoutBox));
for (auto& containingBlock : containingBlockChain(*m_layoutBox)) {
if (&containingBlock == &formattingContextRoot)
return true;
}
ASSERT_NOT_REACHED();
return false;
}
void PlacedFloats::clear()
{
m_list.clear();
m_positionTypes = { };
}
std::optional<LayoutUnit> PlacedFloats::highestPositionOnBlockAxis() const
{
auto highestBlockAxisPosition = std::optional<LayoutUnit> { };
for (auto& floatItem : m_list)
highestBlockAxisPosition = !highestBlockAxisPosition ? floatItem.absoluteRectWithMargin().top() : std::min(*highestBlockAxisPosition, floatItem.absoluteRectWithMargin().top());
return highestBlockAxisPosition;
}
std::optional<LayoutUnit> PlacedFloats::lowestPositionOnBlockAxis(Clear type) const
{
// TODO: Currently this is only called once for each formatting context root with floats per layout.
// Cache the value if we end up calling it more frequently (and update it at append/remove).
auto lowestBlockAxisPosition = std::optional<LayoutUnit> { };
for (auto& floatItem : m_list) {
if ((type == Clear::InlineStart && !floatItem.isStartPositioned()) || (type == Clear::InlineEnd && floatItem.isStartPositioned()))
continue;
lowestBlockAxisPosition = !lowestBlockAxisPosition ? floatItem.absoluteRectWithMargin().bottom() : std::max(*lowestBlockAxisPosition, floatItem.absoluteRectWithMargin().bottom());
}
return lowestBlockAxisPosition;
}
void PlacedFloats::shrinkToFit()
{
m_list.shrinkToFit();
}
}
}
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