416 lines
18 KiB
C++
416 lines
18 KiB
C++
/*
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* Copyright (C) 2008 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "RenderLineBoxList.h"
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#include "HitTestResult.h"
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#include "LegacyInlineElementBox.h"
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#include "LegacyInlineTextBox.h"
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#include "LegacyRootInlineBox.h"
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#include "PaintInfo.h"
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#include "RenderBlockFlow.h"
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#include "RenderInline.h"
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#include "RenderLineBreak.h"
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#include "RenderView.h"
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namespace WebCore {
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#ifndef NDEBUG
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RenderLineBoxList::~RenderLineBoxList()
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{
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ASSERT(!m_firstLineBox);
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ASSERT(!m_lastLineBox);
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}
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#endif
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void RenderLineBoxList::appendLineBox(std::unique_ptr<LegacyInlineFlowBox> box)
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{
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checkConsistency();
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LegacyInlineFlowBox* boxPtr = box.release();
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if (!m_firstLineBox) {
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m_firstLineBox = boxPtr;
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m_lastLineBox = boxPtr;
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} else {
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m_lastLineBox->setNextLineBox(boxPtr);
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boxPtr->setPreviousLineBox(m_lastLineBox);
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m_lastLineBox = boxPtr;
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}
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checkConsistency();
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}
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void RenderLineBoxList::deleteLineBoxTree()
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{
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LegacyInlineFlowBox* line = m_firstLineBox;
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LegacyInlineFlowBox* nextLine;
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while (line) {
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nextLine = line->nextLineBox();
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line->deleteLine();
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line = nextLine;
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}
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m_firstLineBox = m_lastLineBox = nullptr;
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}
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void RenderLineBoxList::extractLineBox(LegacyInlineFlowBox* box)
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{
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checkConsistency();
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m_lastLineBox = box->prevLineBox();
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if (box == m_firstLineBox)
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m_firstLineBox = 0;
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if (box->prevLineBox())
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box->prevLineBox()->setNextLineBox(nullptr);
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box->setPreviousLineBox(nullptr);
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for (auto* curr = box; curr; curr = curr->nextLineBox())
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curr->setExtracted();
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checkConsistency();
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}
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void RenderLineBoxList::attachLineBox(LegacyInlineFlowBox* box)
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{
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checkConsistency();
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if (m_lastLineBox) {
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m_lastLineBox->setNextLineBox(box);
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box->setPreviousLineBox(m_lastLineBox);
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} else
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m_firstLineBox = box;
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LegacyInlineFlowBox* last = box;
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for (auto* curr = box; curr; curr = curr->nextLineBox()) {
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curr->setExtracted(false);
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last = curr;
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}
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m_lastLineBox = last;
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checkConsistency();
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}
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void RenderLineBoxList::removeLineBox(LegacyInlineFlowBox* box)
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{
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checkConsistency();
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if (box == m_firstLineBox)
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m_firstLineBox = box->nextLineBox();
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if (box == m_lastLineBox)
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m_lastLineBox = box->prevLineBox();
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if (box->nextLineBox())
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box->nextLineBox()->setPreviousLineBox(box->prevLineBox());
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if (box->prevLineBox())
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box->prevLineBox()->setNextLineBox(box->nextLineBox());
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checkConsistency();
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}
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void RenderLineBoxList::deleteLineBoxes()
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{
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if (m_firstLineBox) {
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LegacyInlineFlowBox* next;
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for (auto* curr = m_firstLineBox; curr; curr = next) {
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next = curr->nextLineBox();
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delete curr;
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}
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m_firstLineBox = nullptr;
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m_lastLineBox = nullptr;
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}
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}
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void RenderLineBoxList::dirtyLineBoxes()
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{
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for (auto* curr = firstLineBox(); curr; curr = curr->nextLineBox())
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curr->dirtyLineBoxes();
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}
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// FIXME: This should take a RenderBoxModelObject&.
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bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const
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{
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LayoutUnit physicalStart = logicalTop;
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LayoutUnit physicalEnd = logicalBottom;
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if (renderer->view().frameView().hasFlippedBlockRenderers()) {
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RenderBox* block;
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if (is<RenderBox>(*renderer))
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block = downcast<RenderBox>(renderer);
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else
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block = renderer->containingBlock();
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physicalStart = block->flipForWritingMode(logicalTop);
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physicalEnd = block->flipForWritingMode(logicalBottom);
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}
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LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart);
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physicalStart = std::min(physicalStart, physicalEnd);
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if (renderer->style().isHorizontalWritingMode()) {
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physicalStart += offset.y();
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if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y())
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return false;
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} else {
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physicalStart += offset.x();
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if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x())
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return false;
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}
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return true;
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}
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bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset, bool usePrintRect) const
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{
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// We can check the first box and last box and avoid painting/hit testing if we don't
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// intersect. This is a quick short-circuit that we can take to avoid walking any lines.
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// FIXME: This check is flawed in the following extremely obscure way:
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// if some line in the middle has a huge overflow, it might actually extend below the last line.
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const LegacyRootInlineBox& firstRootBox = firstLineBox()->root();
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const LegacyRootInlineBox& lastRootBox = lastLineBox()->root();
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LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox.lineTop());
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if (usePrintRect && !firstLineBox()->parent())
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firstLineTop = std::min(firstLineTop, firstRootBox.lineTop());
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LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox.lineBottom());
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if (usePrintRect && !lastLineBox()->parent())
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lastLineBottom = std::max(lastLineBottom, lastRootBox.lineBottom());
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return rangeIntersectsRect(renderer, firstLineTop, lastLineBottom, rect, offset);
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}
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bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, LegacyInlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const
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{
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const LegacyRootInlineBox& rootBox = box->root();
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LayoutUnit logicalTop = std::min(box->logicalTopVisualOverflow(rootBox.lineTop()), rootBox.selectionTop());
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LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(rootBox.lineBottom());
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return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset);
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}
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void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
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{
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ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.
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// If we have no lines then we have no work to do.
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if (!firstLineBox())
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return;
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// FIXME: Paint-time pagination is obsolete and is now only used by embedded WebViews inside AppKit
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// NSViews. Do not add any more code for this.
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RenderView& v = renderer->view();
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bool usePrintRect = !v.printRect().isEmpty();
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if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset, usePrintRect))
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return;
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PaintInfo info(paintInfo);
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ListHashSet<RenderInline*> outlineObjects;
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info.outlineObjects = &outlineObjects;
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// See if our root lines intersect with the dirty rect. If so, then we paint
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// them. Note that boxes can easily overlap, so we can't make any assumptions
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// based off positions of our first line box or our last line box.
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for (auto* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
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if (usePrintRect) {
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// FIXME: This is the deprecated pagination model that is still needed
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// for embedded views inside AppKit. AppKit is incapable of paginating vertical
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// text pages, so we don't have to deal with vertical lines at all here.
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const LegacyRootInlineBox& rootBox = curr->root();
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LayoutUnit topForPaginationCheck = curr->logicalTopVisualOverflow(rootBox.lineTop());
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LayoutUnit bottomForPaginationCheck = curr->logicalLeftVisualOverflow();
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if (!curr->parent()) {
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// We're a root box. Use lineTop and lineBottom as well here.
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topForPaginationCheck = std::min(topForPaginationCheck, rootBox.lineTop());
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bottomForPaginationCheck = std::max(bottomForPaginationCheck, rootBox.lineBottom());
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}
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if (bottomForPaginationCheck - topForPaginationCheck <= v.printRect().height()) {
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if (paintOffset.y() + bottomForPaginationCheck > v.printRect().maxY()) {
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if (LegacyRootInlineBox* nextRootBox = rootBox.nextRootBox())
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bottomForPaginationCheck = std::min(bottomForPaginationCheck, std::min<LayoutUnit>(nextRootBox->logicalTopVisualOverflow(), nextRootBox->lineTop()));
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}
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if (paintOffset.y() + bottomForPaginationCheck > v.printRect().maxY()) {
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if (paintOffset.y() + topForPaginationCheck < v.truncatedAt())
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v.setBestTruncatedAt(paintOffset.y() + topForPaginationCheck, renderer);
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// If we were able to truncate, don't paint.
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if (paintOffset.y() + topForPaginationCheck >= v.truncatedAt())
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break;
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}
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}
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}
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if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) {
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const LegacyRootInlineBox& rootBox = curr->root();
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curr->paint(info, paintOffset, rootBox.lineTop(), rootBox.lineBottom());
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}
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}
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if (info.phase == PaintPhase::Outline || info.phase == PaintPhase::SelfOutline || info.phase == PaintPhase::ChildOutlines) {
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ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end();
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for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) {
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RenderInline* flow = *it;
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flow->paintOutline(info, paintOffset);
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}
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info.outlineObjects->clear();
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}
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}
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bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const
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{
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ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.
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// If we have no lines then we have no work to do.
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if (!firstLineBox())
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return false;
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LayoutPoint point = locationInContainer.point();
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LayoutRect rect = firstLineBox()->isHorizontal() ?
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IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) :
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IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1);
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if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset))
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return false;
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// See if our root lines contain the point. If so, then we hit test
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// them further. Note that boxes can easily overlap, so we can't make any assumptions
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// based off positions of our first line box or our last line box.
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for (auto* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
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const LegacyRootInlineBox& rootBox = curr->root();
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if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(rootBox.lineTop()), curr->logicalBottomVisualOverflow(rootBox.lineBottom()), rect, accumulatedOffset)) {
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bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, rootBox.lineTop(), rootBox.lineBottom(), hitTestAction);
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if (inside) {
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renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
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return true;
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}
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}
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}
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return false;
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}
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void RenderLineBoxList::dirtyLinesFromChangedChild(RenderBoxModelObject& container, RenderObject& child)
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{
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ASSERT(is<RenderInline>(container) || is<RenderBlockFlow>(container));
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if (!container.parent() || (is<RenderBlockFlow>(container) && container.selfNeedsLayout()))
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return;
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RenderInline* inlineContainer = is<RenderInline>(container) ? &downcast<RenderInline>(container) : nullptr;
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LegacyInlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox();
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// If we have no first line box, then just bail early.
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if (!firstBox) {
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// For an empty inline, propagate the check up to our parent, unless the parent is already dirty.
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if (container.isInline() && !container.ancestorLineBoxDirty()) {
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container.parent()->dirtyLinesFromChangedChild(container);
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container.setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
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}
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return;
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}
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// Try to figure out which line box we belong in. First try to find a previous
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// line box by examining our siblings. If we didn't find a line box, then use our
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// parent's first line box.
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LegacyRootInlineBox* box = nullptr;
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RenderObject* current;
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for (current = child.previousSibling(); current; current = current->previousSibling()) {
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if (current->isFloatingOrOutOfFlowPositioned())
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continue;
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if (current->isReplaced()) {
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if (auto wrapper = downcast<RenderBox>(*current).inlineBoxWrapper())
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box = &wrapper->root();
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} if (is<RenderLineBreak>(*current)) {
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if (auto wrapper = downcast<RenderLineBreak>(*current).inlineBoxWrapper())
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box = &wrapper->root();
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} else if (is<RenderText>(*current)) {
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if (LegacyInlineTextBox* textBox = downcast<RenderText>(*current).lastTextBox())
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box = &textBox->root();
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} else if (is<RenderInline>(*current)) {
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LegacyInlineBox* lastSiblingBox = downcast<RenderInline>(*current).lastLineBoxIncludingCulling();
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if (lastSiblingBox)
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box = &lastSiblingBox->root();
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}
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if (box)
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break;
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}
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if (!box) {
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if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) {
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// https://bugs.webkit.org/show_bug.cgi?id=60778
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// We may have just removed a <br> with no line box that was our first child. In this case
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// we won't find a previous sibling, but firstBox can be pointing to a following sibling.
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// This isn't good enough, since we won't locate the root line box that encloses the removed
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// <br>. We have to just over-invalidate a bit and go up to our parent.
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if (!inlineContainer->ancestorLineBoxDirty()) {
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inlineContainer->parent()->dirtyLinesFromChangedChild(*inlineContainer);
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inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
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}
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return;
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}
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box = &firstBox->root();
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}
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// If we found a line box, then dirty it.
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if (box) {
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box->markDirty();
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// Dirty the adjacent lines that might be affected.
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// NOTE: we dirty the previous line because RootInlineBox objects cache
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// the address of the first object on the next line after a BR, which we may be
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// invalidating here. For more info, see how RenderBlock::layoutInlineChildren
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// calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak,
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// despite the name, actually returns the first RenderObject after the BR.
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// <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
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if (LegacyRootInlineBox* prevBox = box->prevRootBox())
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prevBox->markDirty();
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// FIXME: We shouldn't need to always dirty the next line. This is only strictly
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// necessary some of the time, in situations involving BRs.
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if (LegacyRootInlineBox* nextBox = box->nextRootBox()) {
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nextBox->markDirty();
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// Dedicated linebox for floats may be added as the last rootbox. If this occurs with BRs inside inlines that propagte their lineboxes to
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// the parent flow, we need to invalidate it explicitly.
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// FIXME: We should be able to figure out the actual "changed child" even when we are calling through empty inlines recursively.
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if (is<RenderInline>(child) && !downcast<RenderInline>(child).firstLineBoxIncludingCulling()) {
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auto* lastRootBox = nextBox->blockFlow().lastRootBox();
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if (lastRootBox->isForTrailingFloats() && !lastRootBox->isDirty())
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lastRootBox->markDirty();
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}
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}
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}
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}
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#ifndef NDEBUG
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void RenderLineBoxList::checkConsistency() const
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{
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#ifdef CHECK_CONSISTENCY
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const LegacyInlineFlowBox* prev = nullptr;
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for (const LegacyInlineFlowBox* child = m_firstLineBox; child != nullptr; child = child->nextLineBox()) {
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ASSERT(child->prevLineBox() == prev);
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prev = child;
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}
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ASSERT(prev == m_lastLineBox);
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#endif
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}
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#endif
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}
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