Source/WebCore/layout/integration/LayoutIntegrationLineLayout.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2019 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 "LayoutIntegrationLineLayout.h"

 #if ENABLE(LAYOUT_FORMATTING_CONTEXT)

 #include "DisplayBox.h"
 #include "EventRegion.h"
 #include "FloatingState.h"
 #include "HitTestLocation.h"
 #include "HitTestRequest.h"
 #include "HitTestResult.h"
 #include "InlineFormattingContext.h"
 #include "InlineFormattingState.h"
 #include "InvalidationState.h"
 #include "LayoutTreeBuilder.h"
 #include "PaintInfo.h"
 #include "RenderBlockFlow.h"
 #include "RenderChildIterator.h"
 #include "RenderDescendantIterator.h"
 #include "RenderLineBreak.h"
 #include "RenderView.h"
 #include "RuntimeEnabledFeatures.h"
 #include "Settings.h"
 #include "SimpleLineLayout.h"
 #include "TextDecorationPainter.h"
 #include "TextPainter.h"

 namespace WebCore {
 namespace LayoutIntegration {

 LineLayout::LineLayout(const RenderBlockFlow& flow)
     : m_flow(flow)
     , m_boxTree(flow)
     , m_layoutState(m_flow.document(), rootLayoutBox())
     , m_inlineFormattingState(m_layoutState.ensureInlineFormattingState(rootLayoutBox()))
 {
     m_layoutState.setIsIntegratedRootBoxFirstChild(m_flow.parent()->firstChild() == &m_flow);
 }

 LineLayout::~LineLayout() = default;

 bool LineLayout::canUseFor(const RenderBlockFlow& flow, Optional<bool> couldUseSimpleLineLayout)
 {
     if (!RuntimeEnabledFeatures::sharedFeatures().layoutFormattingContextIntegrationEnabled())
         return false;

     // Initially only a subset of SLL features is supported.
     auto passesSimpleLineLayoutTest = valueOrCompute(couldUseSimpleLineLayout, [&] {
         return SimpleLineLayout::canUseFor(flow);
     });

     if (!passesSimpleLineLayoutTest)
         return false;

     if (flow.fragmentedFlowState() != RenderObject::NotInsideFragmentedFlow)
         return false;

     return true;
 }

 void LineLayout::updateStyle()
 {
     auto& root = rootLayoutBox();

     // FIXME: Encapsulate style updates better.
     root.updateStyle(m_flow.style());

     for (auto* child = root.firstChild(); child; child = child->nextSibling()) {
         if (child->isAnonymous())
             child->updateStyle(RenderStyle::createAnonymousStyleWithDisplay(root.style(), DisplayType::Inline));
     }
 }

 void LineLayout::layout()
 {
     if (!rootLayoutBox().hasInFlowOrFloatingChild())
         return;

     prepareLayoutState();
     prepareFloatingState();

     auto inlineFormattingContext = Layout::InlineFormattingContext { rootLayoutBox(), m_inlineFormattingState };

     auto invalidationState = Layout::InvalidationState { };
     auto horizontalConstraints = Layout::HorizontalConstraints { m_flow.borderAndPaddingStart(), m_flow.contentSize().width() };
     auto verticalConstraints = Layout::VerticalConstraints { m_flow.borderAndPaddingBefore(), { } };

     inlineFormattingContext.layoutInFlowContent(invalidationState, horizontalConstraints, verticalConstraints);
     m_inlineFormattingState.shrinkDisplayInlineContent();
 }

 void LineLayout::prepareLayoutState()
 {
     m_layoutState.setViewportSize(m_flow.frame().view()->size());
 }

 void LineLayout::prepareFloatingState()
 {
     auto& floatingState = m_inlineFormattingState.floatingState();
     floatingState.clear();

     if (!m_flow.containsFloats())
         return;

     for (auto& floatingObject : *m_flow.floatingObjectSet()) {
         auto& rect = floatingObject->frameRect();
         auto position = floatingObject->type() == FloatingObject::FloatRight
             ? Layout::FloatingState::FloatItem::Position::Right
             : Layout::FloatingState::FloatItem::Position::Left;
         auto box = Display::Box { };
         // FIXME: We are flooring here for legacy compatibility.
         //        See FloatingObjects::intervalForFloatingObject.
         auto y = rect.y().floor();
         auto maxY = rect.maxY().floor();
         box.setTopLeft({ rect.x(), y });
         box.setContentBoxWidth(rect.width());
         box.setContentBoxHeight(maxY - y);
         box.setBorder({ });
         box.setPadding({ });
         box.setHorizontalMargin({ });
         box.setVerticalMargin({ });
         floatingState.append({ position, box });
     }
 }

 LayoutUnit LineLayout::contentLogicalHeight() const
 {
     auto& lineBoxes = displayInlineContent()->lineBoxes;
     return LayoutUnit { lineBoxes.last().bottom() - lineBoxes.first().top() };
 }

 size_t LineLayout::lineCount() const
 {
     auto* inlineContent = displayInlineContent();
     if (!inlineContent)
         return 0;
     if (inlineContent->runs.isEmpty())
         return 0;
     return inlineContent->lineBoxes.size();
 }

 LayoutUnit LineLayout::firstLineBaseline() const
 {
     auto* inlineContent = displayInlineContent();
     if (!inlineContent) {
         ASSERT_NOT_REACHED();
         return 0_lu;
     }

     auto& firstLineBox = inlineContent->lineBoxes.first();
     return Layout::toLayoutUnit(firstLineBox.top() + firstLineBox.baselineOffset());
 }

 LayoutUnit LineLayout::lastLineBaseline() const
 {
     auto* inlineContent = displayInlineContent();
     if (!inlineContent) {
         ASSERT_NOT_REACHED();
         return 0_lu;
     }

     auto& lastLineBox = inlineContent->lineBoxes.last();
     return Layout::toLayoutUnit(lastLineBox.top() + lastLineBox.baselineOffset());
 }

 void LineLayout::collectOverflow(RenderBlockFlow& flow)
 {
     ASSERT(&flow == &m_flow);
     ASSERT(!flow.hasOverflowClip());

     for (auto& lineBox : displayInlineContent()->lineBoxes) {
         flow.addLayoutOverflow(Layout::toLayoutRect(lineBox.scrollableOverflow()));
         flow.addVisualOverflow(Layout::toLayoutRect(lineBox.inkOverflow()));
     }
 }

 const Display::InlineContent* LineLayout::displayInlineContent() const
 {
     return m_inlineFormattingState.displayInlineContent();
 }

 LineLayoutTraversal::TextBoxIterator LineLayout::textBoxesFor(const RenderText& renderText) const
 {
     auto* inlineContent = displayInlineContent();
     if (!inlineContent)
         return { };
     auto* layoutBox = m_boxTree.layoutBoxForRenderer(renderText);
     ASSERT(layoutBox);

     Optional<size_t> firstIndex;
     size_t lastIndex = 0;
     for (size_t i = 0; i < inlineContent->runs.size(); ++i) {
         auto& run = inlineContent->runs[i];
         if (&run.layoutBox() == layoutBox) {
             if (!firstIndex)
                 firstIndex = i;
             lastIndex = i;
         } else if (firstIndex)
             break;
     }
     if (!firstIndex)
         return { };

     return { LineLayoutTraversal::DisplayRunPath(*inlineContent, *firstIndex, lastIndex + 1) };
 }

 LineLayoutTraversal::ElementBoxIterator LineLayout::elementBoxFor(const RenderLineBreak& renderLineBreak) const
 {
     auto* inlineContent = displayInlineContent();
     if (!inlineContent)
         return { };
     auto* layoutBox = m_boxTree.layoutBoxForRenderer(renderLineBreak);
     ASSERT(layoutBox);

     for (size_t i = 0; i < inlineContent->runs.size(); ++i) {
         auto& run =  inlineContent->runs[i];
         if (&run.layoutBox() == layoutBox)
             return { LineLayoutTraversal::DisplayRunPath(*inlineContent, i, i + 1) };
     }

     return { };
 }

 const Layout::ContainerBox& LineLayout::rootLayoutBox() const
 {
     return m_boxTree.rootLayoutBox();
 }

 Layout::ContainerBox& LineLayout::rootLayoutBox()
 {
     return m_boxTree.rootLayoutBox();
 }

 void LineLayout::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     if (!displayInlineContent())
         return;

     if (paintInfo.phase != PaintPhase::Foreground && paintInfo.phase != PaintPhase::EventRegion)
         return;

     auto& inlineContent = *displayInlineContent();
     float deviceScaleFactor = m_flow.document().deviceScaleFactor();

     auto paintRect = paintInfo.rect;
     paintRect.moveBy(-paintOffset);

     for (auto& run : inlineContent.runsForRect(paintRect)) {
         if (!run.textContent())
             continue;

         auto& textContent = *run.textContent();
         if (!textContent.length())
             continue;

         auto& style = run.style();
         if (style.visibility() != Visibility::Visible)
             continue;

         auto rect = FloatRect { run.rect() };
         auto visualOverflowRect = FloatRect { run.inkOverflow() };
         if (paintRect.y() > visualOverflowRect.maxY() || paintRect.maxY() < visualOverflowRect.y())
             continue;

         if (paintInfo.eventRegionContext) {
             if (style.pointerEvents() != PointerEvents::None)
                 paintInfo.eventRegionContext->unite(enclosingIntRect(visualOverflowRect), style);
             continue;
         }

         auto& lineBox = inlineContent.lineBoxForRun(run);
         auto baselineOffset = paintOffset.y() + lineBox.top() + lineBox.baselineOffset();
         auto expansion = run.expansion();

         String textWithHyphen;
         if (textContent.needsHyphen())
             textWithHyphen = makeString(textContent.content(), style.hyphenString());
         TextRun textRun { !textWithHyphen.isEmpty() ? textWithHyphen : textContent.content(), run.left() - lineBox.left(), expansion.horizontalExpansion, expansion.behavior };
         textRun.setTabSize(!style.collapseWhiteSpace(), style.tabSize());
         FloatPoint textOrigin { rect.x() + paintOffset.x(), roundToDevicePixel(baselineOffset, deviceScaleFactor) };

         TextPainter textPainter(paintInfo.context());
         textPainter.setFont(style.fontCascade());
         textPainter.setStyle(computeTextPaintStyle(m_flow.frame(), style, paintInfo));
         if (auto* debugShadow = debugTextShadow())
             textPainter.setShadow(debugShadow);

         textPainter.setGlyphDisplayListIfNeeded(run, paintInfo, style.fontCascade(), paintInfo.context(), textRun);
         textPainter.paint(textRun, rect, textOrigin);

         if (!style.textDecorationsInEffect().isEmpty()) {
             // FIXME: Use correct RenderText.
             if (auto* textRenderer = childrenOfType<RenderText>(m_flow).first()) {
                 auto painter = TextDecorationPainter { paintInfo.context(), style.textDecorationsInEffect(), *textRenderer, false, style.fontCascade() };
                 painter.setWidth(rect.width());
                 painter.paintTextDecoration(textRun, textOrigin, rect.location() + paintOffset);
             }
         }
     }
 }

 bool LineLayout::hitTest(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     if (hitTestAction != HitTestForeground)
         return false;

     if (!displayInlineContent())
         return false;

     auto& inlineContent = *displayInlineContent();

     // FIXME: This should do something efficient to find the run range.
     for (auto& run : inlineContent.runs) {
         auto runRect = Layout::toLayoutRect(run.rect());
         runRect.moveBy(accumulatedOffset);

         if (!locationInContainer.intersects(runRect))
             continue;

         auto& style = run.style();
         if (style.visibility() != Visibility::Visible || style.pointerEvents() == PointerEvents::None)
             continue;

         auto& renderer = const_cast<RenderObject&>(*m_boxTree.rendererForLayoutBox(run.layoutBox()));

         renderer.updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
         if (result.addNodeToListBasedTestResult(renderer.nodeForHitTest(), request, locationInContainer, runRect) == HitTestProgress::Stop)
             return true;
     }

     return false;
 }

 ShadowData* LineLayout::debugTextShadow()
 {
     if (!m_flow.settings().simpleLineLayoutDebugBordersEnabled())
         return nullptr;

     static NeverDestroyed<ShadowData> debugTextShadow(IntPoint(0, 0), 10, 20, ShadowStyle::Normal, true, Color(0, 0, 150, 150));
     return &debugTextShadow.get();
 }

 void LineLayout::releaseCaches(RenderView& view)
 {
     if (!RuntimeEnabledFeatures::sharedFeatures().layoutFormattingContextIntegrationEnabled())
         return;

     for (auto& renderer : descendantsOfType<RenderBlockFlow>(view)) {
         if (auto* lineLayout = renderer.layoutFormattingContextLineLayout())
             lineLayout->releaseInlineItemCache();
     }
 }

 void LineLayout::releaseInlineItemCache()
 {
     m_inlineFormattingState.inlineItems().clear();
 }


 }
 }

 #endif
	/*
	* Copyright (C) 2019 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 "LayoutIntegrationLineLayout.h"

	#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

	#include "DisplayBox.h"
	#include "EventRegion.h"
	#include "FloatingState.h"
	#include "HitTestLocation.h"
	#include "HitTestRequest.h"
	#include "HitTestResult.h"
	#include "InlineFormattingContext.h"
	#include "InlineFormattingState.h"
	#include "InvalidationState.h"
	#include "LayoutTreeBuilder.h"
	#include "PaintInfo.h"
	#include "RenderBlockFlow.h"
	#include "RenderChildIterator.h"
	#include "RenderDescendantIterator.h"
	#include "RenderLineBreak.h"
	#include "RenderView.h"
	#include "RuntimeEnabledFeatures.h"
	#include "Settings.h"
	#include "SimpleLineLayout.h"
	#include "TextDecorationPainter.h"
	#include "TextPainter.h"

	namespace WebCore {
	namespace LayoutIntegration {

	LineLayout::LineLayout(const RenderBlockFlow& flow)
	: m_flow(flow)
	, m_boxTree(flow)
	, m_layoutState(m_flow.document(), rootLayoutBox())
	, m_inlineFormattingState(m_layoutState.ensureInlineFormattingState(rootLayoutBox()))
	{
	m_layoutState.setIsIntegratedRootBoxFirstChild(m_flow.parent()->firstChild() == &m_flow);
	}

	LineLayout::~LineLayout() = default;

	bool LineLayout::canUseFor(const RenderBlockFlow& flow, Optional<bool> couldUseSimpleLineLayout)
	{
	if (!RuntimeEnabledFeatures::sharedFeatures().layoutFormattingContextIntegrationEnabled())
	return false;

	// Initially only a subset of SLL features is supported.
	auto passesSimpleLineLayoutTest = valueOrCompute(couldUseSimpleLineLayout, [&] {
	return SimpleLineLayout::canUseFor(flow);
	});

	if (!passesSimpleLineLayoutTest)
	return false;

	if (flow.fragmentedFlowState() != RenderObject::NotInsideFragmentedFlow)
	return false;

	return true;
	}

	void LineLayout::updateStyle()
	{
	auto& root = rootLayoutBox();

	// FIXME: Encapsulate style updates better.
	root.updateStyle(m_flow.style());

	for (auto* child = root.firstChild(); child; child = child->nextSibling()) {
	if (child->isAnonymous())
	child->updateStyle(RenderStyle::createAnonymousStyleWithDisplay(root.style(), DisplayType::Inline));
	}
	}

	void LineLayout::layout()
	{
	if (!rootLayoutBox().hasInFlowOrFloatingChild())
	return;

	prepareLayoutState();
	prepareFloatingState();

	auto inlineFormattingContext = Layout::InlineFormattingContext { rootLayoutBox(), m_inlineFormattingState };

	auto invalidationState = Layout::InvalidationState { };
	auto horizontalConstraints = Layout::HorizontalConstraints { m_flow.borderAndPaddingStart(), m_flow.contentSize().width() };
	auto verticalConstraints = Layout::VerticalConstraints { m_flow.borderAndPaddingBefore(), { } };

	inlineFormattingContext.layoutInFlowContent(invalidationState, horizontalConstraints, verticalConstraints);
	m_inlineFormattingState.shrinkDisplayInlineContent();
	}

	void LineLayout::prepareLayoutState()
	{
	m_layoutState.setViewportSize(m_flow.frame().view()->size());
	}

	void LineLayout::prepareFloatingState()
	{
	auto& floatingState = m_inlineFormattingState.floatingState();
	floatingState.clear();

	if (!m_flow.containsFloats())
	return;

	for (auto& floatingObject : *m_flow.floatingObjectSet()) {
	auto& rect = floatingObject->frameRect();
	auto position = floatingObject->type() == FloatingObject::FloatRight
	? Layout::FloatingState::FloatItem::Position::Right
	: Layout::FloatingState::FloatItem::Position::Left;
	auto box = Display::Box { };
	// FIXME: We are flooring here for legacy compatibility.
	// See FloatingObjects::intervalForFloatingObject.
	auto y = rect.y().floor();
	auto maxY = rect.maxY().floor();
	box.setTopLeft({ rect.x(), y });
	box.setContentBoxWidth(rect.width());
	box.setContentBoxHeight(maxY - y);
	box.setBorder({ });
	box.setPadding({ });
	box.setHorizontalMargin({ });
	box.setVerticalMargin({ });
	floatingState.append({ position, box });
	}
	}

	LayoutUnit LineLayout::contentLogicalHeight() const
	{
	auto& lineBoxes = displayInlineContent()->lineBoxes;
	return LayoutUnit { lineBoxes.last().bottom() - lineBoxes.first().top() };
	}

	size_t LineLayout::lineCount() const
	{
	auto* inlineContent = displayInlineContent();
	if (!inlineContent)
	return 0;
	if (inlineContent->runs.isEmpty())
	return 0;
	return inlineContent->lineBoxes.size();
	}

	LayoutUnit LineLayout::firstLineBaseline() const
	{
	auto* inlineContent = displayInlineContent();
	if (!inlineContent) {
	ASSERT_NOT_REACHED();
	return 0_lu;
	}

	auto& firstLineBox = inlineContent->lineBoxes.first();
	return Layout::toLayoutUnit(firstLineBox.top() + firstLineBox.baselineOffset());
	}

	LayoutUnit LineLayout::lastLineBaseline() const
	{
	auto* inlineContent = displayInlineContent();
	if (!inlineContent) {
	ASSERT_NOT_REACHED();
	return 0_lu;
	}

	auto& lastLineBox = inlineContent->lineBoxes.last();
	return Layout::toLayoutUnit(lastLineBox.top() + lastLineBox.baselineOffset());
	}

	void LineLayout::collectOverflow(RenderBlockFlow& flow)
	{
	ASSERT(&flow == &m_flow);
	ASSERT(!flow.hasOverflowClip());

	for (auto& lineBox : displayInlineContent()->lineBoxes) {
	flow.addLayoutOverflow(Layout::toLayoutRect(lineBox.scrollableOverflow()));
	flow.addVisualOverflow(Layout::toLayoutRect(lineBox.inkOverflow()));
	}
	}

	const Display::InlineContent* LineLayout::displayInlineContent() const
	{
	return m_inlineFormattingState.displayInlineContent();
	}

	LineLayoutTraversal::TextBoxIterator LineLayout::textBoxesFor(const RenderText& renderText) const
	{
	auto* inlineContent = displayInlineContent();
	if (!inlineContent)
	return { };
	auto* layoutBox = m_boxTree.layoutBoxForRenderer(renderText);
	ASSERT(layoutBox);

	Optional<size_t> firstIndex;
	size_t lastIndex = 0;
	for (size_t i = 0; i < inlineContent->runs.size(); ++i) {
	auto& run = inlineContent->runs[i];
	if (&run.layoutBox() == layoutBox) {
	if (!firstIndex)
	firstIndex = i;
	lastIndex = i;
	} else if (firstIndex)
	break;
	}
	if (!firstIndex)
	return { };

	return { LineLayoutTraversal::DisplayRunPath(inlineContent, firstIndex, lastIndex + 1) };
	}

	LineLayoutTraversal::ElementBoxIterator LineLayout::elementBoxFor(const RenderLineBreak& renderLineBreak) const
	{
	auto* inlineContent = displayInlineContent();
	if (!inlineContent)
	return { };
	auto* layoutBox = m_boxTree.layoutBoxForRenderer(renderLineBreak);
	ASSERT(layoutBox);

	for (size_t i = 0; i < inlineContent->runs.size(); ++i) {
	auto& run = inlineContent->runs[i];
	if (&run.layoutBox() == layoutBox)
	return { LineLayoutTraversal::DisplayRunPath(*inlineContent, i, i + 1) };
	}

	return { };
	}

	const Layout::ContainerBox& LineLayout::rootLayoutBox() const
	{
	return m_boxTree.rootLayoutBox();
	}

	Layout::ContainerBox& LineLayout::rootLayoutBox()
	{
	return m_boxTree.rootLayoutBox();
	}

	void LineLayout::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
	{
	if (!displayInlineContent())
	return;

	if (paintInfo.phase != PaintPhase::Foreground && paintInfo.phase != PaintPhase::EventRegion)
	return;

	auto& inlineContent = *displayInlineContent();
	float deviceScaleFactor = m_flow.document().deviceScaleFactor();

	auto paintRect = paintInfo.rect;
	paintRect.moveBy(-paintOffset);

	for (auto& run : inlineContent.runsForRect(paintRect)) {
	if (!run.textContent())
	continue;

	auto& textContent = *run.textContent();
	if (!textContent.length())
	continue;

	auto& style = run.style();
	if (style.visibility() != Visibility::Visible)
	continue;

	auto rect = FloatRect { run.rect() };
	auto visualOverflowRect = FloatRect { run.inkOverflow() };
	if (paintRect.y() > visualOverflowRect.maxY() \|\| paintRect.maxY() < visualOverflowRect.y())
	continue;

	if (paintInfo.eventRegionContext) {
	if (style.pointerEvents() != PointerEvents::None)
	paintInfo.eventRegionContext->unite(enclosingIntRect(visualOverflowRect), style);
	continue;
	}

	auto& lineBox = inlineContent.lineBoxForRun(run);
	auto baselineOffset = paintOffset.y() + lineBox.top() + lineBox.baselineOffset();
	auto expansion = run.expansion();

	String textWithHyphen;
	if (textContent.needsHyphen())
	textWithHyphen = makeString(textContent.content(), style.hyphenString());
	TextRun textRun { !textWithHyphen.isEmpty() ? textWithHyphen : textContent.content(), run.left() - lineBox.left(), expansion.horizontalExpansion, expansion.behavior };
	textRun.setTabSize(!style.collapseWhiteSpace(), style.tabSize());
	FloatPoint textOrigin { rect.x() + paintOffset.x(), roundToDevicePixel(baselineOffset, deviceScaleFactor) };

	TextPainter textPainter(paintInfo.context());
	textPainter.setFont(style.fontCascade());
	textPainter.setStyle(computeTextPaintStyle(m_flow.frame(), style, paintInfo));
	if (auto* debugShadow = debugTextShadow())
	textPainter.setShadow(debugShadow);

	textPainter.setGlyphDisplayListIfNeeded(run, paintInfo, style.fontCascade(), paintInfo.context(), textRun);
	textPainter.paint(textRun, rect, textOrigin);

	if (!style.textDecorationsInEffect().isEmpty()) {
	// FIXME: Use correct RenderText.
	if (auto* textRenderer = childrenOfType<RenderText>(m_flow).first()) {
	auto painter = TextDecorationPainter { paintInfo.context(), style.textDecorationsInEffect(), *textRenderer, false, style.fontCascade() };
	painter.setWidth(rect.width());
	painter.paintTextDecoration(textRun, textOrigin, rect.location() + paintOffset);
	}
	}
	}
	}

	bool LineLayout::hitTest(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
	{
	if (hitTestAction != HitTestForeground)
	return false;

	if (!displayInlineContent())
	return false;

	auto& inlineContent = *displayInlineContent();

	// FIXME: This should do something efficient to find the run range.
	for (auto& run : inlineContent.runs) {
	auto runRect = Layout::toLayoutRect(run.rect());
	runRect.moveBy(accumulatedOffset);

	if (!locationInContainer.intersects(runRect))
	continue;

	auto& style = run.style();
	if (style.visibility() != Visibility::Visible \|\| style.pointerEvents() == PointerEvents::None)
	continue;

	auto& renderer = const_cast<RenderObject&>(*m_boxTree.rendererForLayoutBox(run.layoutBox()));

	renderer.updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
	if (result.addNodeToListBasedTestResult(renderer.nodeForHitTest(), request, locationInContainer, runRect) == HitTestProgress::Stop)
	return true;
	}

	return false;
	}

	ShadowData* LineLayout::debugTextShadow()
	{
	if (!m_flow.settings().simpleLineLayoutDebugBordersEnabled())
	return nullptr;

	static NeverDestroyed<ShadowData> debugTextShadow(IntPoint(0, 0), 10, 20, ShadowStyle::Normal, true, Color(0, 0, 150, 150));
	return &debugTextShadow.get();
	}

	void LineLayout::releaseCaches(RenderView& view)
	{
	if (!RuntimeEnabledFeatures::sharedFeatures().layoutFormattingContextIntegrationEnabled())
	return;

	for (auto& renderer : descendantsOfType<RenderBlockFlow>(view)) {
	if (auto* lineLayout = renderer.layoutFormattingContextLineLayout())
	lineLayout->releaseInlineItemCache();
	}
	}

	void LineLayout::releaseInlineItemCache()
	{
	m_inlineFormattingState.inlineItems().clear();
	}


	}
	}

	#endif