Source/WebCore/layout/Verification.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2018 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 "LayoutState.h"

 #if ENABLE(LAYOUT_FORMATTING_CONTEXT)

 #include "DisplayBox.h"
 #include "InlineTextBox.h"
 #include "LayoutBox.h"
 #include "LayoutContainer.h"
 #include "LayoutTreeBuilder.h"
 #include "RenderBox.h"
 #include "RenderInline.h"
 #include "RenderView.h"
 #include <wtf/text/TextStream.h>

 namespace WebCore {
 namespace Layout {

 static bool areEssentiallyEqual(float a, LayoutUnit b)
 {
     if (a == b.toFloat())
         return true;

     return fabs(a - b.toFloat()) <= 8 * LayoutUnit::epsilon();
 }

 static bool outputMismatchingSimpleLineInformationIfNeeded(TextStream& stream, const LayoutState& layoutState, const RenderBlockFlow& blockFlow, const Container& inlineFormattingRoot)
 {
     auto* lineLayoutData = blockFlow.simpleLineLayout();
     if (!lineLayoutData) {
         ASSERT_NOT_REACHED();
         return true;
     }

     auto& inlineFormattingState = layoutState.establishedFormattingState(inlineFormattingRoot);
     ASSERT(is<InlineFormattingState>(inlineFormattingState));
     auto& inlineRunList = downcast<InlineFormattingState>(inlineFormattingState).inlineRuns();

     if (inlineRunList.size() != lineLayoutData->runCount()) {
         stream << "Mismatching number of runs: simple runs(" << lineLayoutData->runCount() << ") inline runs(" << inlineRunList.size() << ")";
         stream.nextLine();
         return true;
     }

     auto mismatched = false;
     for (unsigned i = 0; i < lineLayoutData->runCount(); ++i) {
         auto& simpleRun = lineLayoutData->runAt(i);
         auto& inlineRun = inlineRunList[i];

         auto matchingRuns = areEssentiallyEqual(simpleRun.logicalLeft, inlineRun.logicalLeft()) && areEssentiallyEqual(simpleRun.logicalRight, inlineRun.logicalRight());
         if (matchingRuns)
             matchingRuns = (simpleRun.start == inlineRun.textContext()->start() && simpleRun.end == (inlineRun.textContext()->start() + inlineRun.textContext()->length()));
         if (matchingRuns)
             continue;

         stream << "Mismatching: simple run(" << simpleRun.start << ", " << simpleRun.end << ") (" << simpleRun.logicalLeft << ", " << simpleRun.logicalRight << ") layout run(" << inlineRun.textContext()->start() << ", " << inlineRun.textContext()->start() + inlineRun.textContext()->length() << ") (" << inlineRun.logicalLeft() << ", " << inlineRun.logicalRight() << ")";
         stream.nextLine();
         mismatched = true;
     }
     return mismatched;
 }

 static bool checkForMatchingNonTextRuns(const InlineRun& inlineRun, const WebCore::InlineBox& inlineBox)
 {
     return areEssentiallyEqual(inlineBox.logicalLeft(), inlineRun.logicalLeft())
         && areEssentiallyEqual(inlineBox.logicalRight(), inlineRun.logicalRight())
         && areEssentiallyEqual(inlineBox.logicalHeight(), inlineRun.logicalHeight());
 }

 static bool checkForMatchingTextRuns(const InlineRun& inlineRun, float logicalLeft, float logicalRight, unsigned start, unsigned end, float logicalHeight)
 {
     return areEssentiallyEqual(logicalLeft, inlineRun.logicalLeft())
         && areEssentiallyEqual(logicalRight, inlineRun.logicalRight())
         && start == inlineRun.textContext()->start()
         && (end == (inlineRun.textContext()->start() + inlineRun.textContext()->length()))
         && areEssentiallyEqual(logicalHeight, inlineRun.logicalHeight());
 }

 static void collectFlowBoxSubtree(const InlineFlowBox& flowbox, Vector<WebCore::InlineBox*>& inlineBoxes)
 {
     auto* inlineBox = flowbox.firstLeafChild();
     auto* lastLeafChild = flowbox.lastLeafChild();
     while (inlineBox) {
         inlineBoxes.append(inlineBox);
         if (inlineBox == lastLeafChild)
             break;
         inlineBox = inlineBox->nextLeafChild();
     }
 }

 static void collectInlineBoxes(const RenderBlockFlow& root, Vector<WebCore::InlineBox*>& inlineBoxes)
 {
     for (auto* rootLine = root.firstRootBox(); rootLine; rootLine = rootLine->nextRootBox()) {
         for (auto* inlineBox = rootLine->firstChild(); inlineBox; inlineBox = inlineBox->nextOnLine()) {
             if (!is<InlineFlowBox>(inlineBox)) {
                 inlineBoxes.append(inlineBox);
                 continue;
             }
             collectFlowBoxSubtree(downcast<InlineFlowBox>(*inlineBox), inlineBoxes);
         }
     }
 }

 static LayoutUnit resolveForRelativePositionIfNeeded(const InlineTextBox& inlineTextBox)
 {
     LayoutUnit xOffset;
     auto* parent = inlineTextBox.parent();
     while (is<InlineFlowBox>(parent)) {
         auto& renderer = parent->renderer();
         if (renderer.isInFlowPositioned())
             xOffset = renderer.offsetForInFlowPosition().width();
         parent = parent->parent();
     }
     return xOffset;
 }

 static bool outputMismatchingComplexLineInformationIfNeeded(TextStream& stream, const LayoutState& layoutState, const RenderBlockFlow& blockFlow, const Container& inlineFormattingRoot)
 {
     auto& inlineFormattingState = layoutState.establishedFormattingState(inlineFormattingRoot);
     ASSERT(is<InlineFormattingState>(inlineFormattingState));
     auto& inlineRunList = downcast<InlineFormattingState>(inlineFormattingState).inlineRuns();

     // Collect inlineboxes.
     Vector<WebCore::InlineBox*> inlineBoxes;
     collectInlineBoxes(blockFlow, inlineBoxes);

     auto mismatched = false;
     unsigned runIndex = 0;

     if (inlineBoxes.size() != inlineRunList.size()) {
         stream << "Warning: mismatching number of runs: inlineboxes(" << inlineBoxes.size() << ") vs. inline runs(" << inlineRunList.size() << ")";
         stream.nextLine();
     }

     for (unsigned inlineBoxIndex = 0; inlineBoxIndex < inlineBoxes.size() && runIndex < inlineRunList.size(); ++inlineBoxIndex) {
         auto* inlineBox = inlineBoxes[inlineBoxIndex];
         auto* inlineTextBox = is<InlineTextBox>(inlineBox) ? downcast<InlineTextBox>(inlineBox) : nullptr;

         auto& inlineRun = inlineRunList[runIndex];
         auto matchingRuns = false;
         if (inlineTextBox) {
             auto xOffset = resolveForRelativePositionIfNeeded(*inlineTextBox);
             matchingRuns = checkForMatchingTextRuns(inlineRun, inlineTextBox->logicalLeft() + xOffset,
                 inlineTextBox->logicalRight() + xOffset,
                 inlineTextBox->start(),
                 inlineTextBox->end() + 1,
                 inlineTextBox->logicalHeight());

             // <span>foobar</span>foobar generates 2 inline text boxes while we only generate one inline run.
             // also <div>foo<img style="float: left;">bar</div> too.
             auto inlineRunEnd = inlineRun.textContext()->start() + inlineRun.textContext()->length();
             auto textRunMightBeExtended = !matchingRuns && inlineTextBox->end() < inlineRunEnd && inlineBoxIndex < inlineBoxes.size() - 1;

             if (textRunMightBeExtended) {
                 auto logicalLeft = inlineTextBox->logicalLeft() + xOffset;
                 auto logicalRight = inlineTextBox->logicalRight() + xOffset;
                 auto start = inlineTextBox->start();
                 auto end = inlineTextBox->end() + 1;
                 auto index = ++inlineBoxIndex;
                 for (; index < inlineBoxes.size(); ++index) {
                     auto* inlineBox = inlineBoxes[index];
                     auto* inlineTextBox = is<InlineTextBox>(inlineBox) ? downcast<InlineTextBox>(inlineBox) : nullptr;
                     // Can't mix different inline boxes.
                     if (!inlineTextBox)
                         break;

                     auto xOffset = resolveForRelativePositionIfNeeded(*inlineTextBox);
                     logicalRight = inlineTextBox->logicalRight() + xOffset;
                     end += (inlineTextBox->end() + 1);
                     if (checkForMatchingTextRuns(inlineRun, logicalLeft, logicalRight, start, end, inlineTextBox->logicalHeight())) {
                         matchingRuns = true;
                         inlineBoxIndex = index;
                         break;
                     }

                     // Went too far?
                     if (end >= inlineRunEnd)
                         break;
                 }
             }
         } else
             matchingRuns = checkForMatchingNonTextRuns(inlineRun, *inlineBox);


         if (!matchingRuns) {
             stream << "Mismatching: run ";

             if (inlineTextBox)
                 stream << "(" << inlineTextBox->start() << ", " << inlineTextBox->end() + 1 << ")";
             stream << " (" << inlineBox->logicalLeft() << ", " << inlineBox->logicalRight() << ") (" << inlineBox->logicalWidth() << "x" << inlineBox->logicalHeight() << ")";

             stream << "inline run ";
             if (inlineRun.textContext())
                 stream << "(" << inlineRun.textContext()->start() << ", " << inlineRun.textContext()->start() + inlineRun.textContext()->length() << ") ";
             stream << "(" << inlineRun.logicalLeft() << ", " << inlineRun.logicalRight() << ") (" << inlineRun.logicalWidth() << "x" << inlineRun.logicalHeight() << ")";
             stream.nextLine();
             mismatched = true;
         }
         ++runIndex;
     }
     return mismatched;
 }

 static bool outputMismatchingBlockBoxInformationIfNeeded(TextStream& stream, const LayoutState& context, const RenderBox& renderer, const Box& layoutBox)
 {
     bool firstMismatchingRect = true;
     auto outputRect = [&] (const String& prefix, const LayoutRect& rendererRect, const LayoutRect& layoutRect) {
         if (firstMismatchingRect) {
             stream << (renderer.element() ? renderer.element()->nodeName().utf8().data() : "") << " " << renderer.renderName() << "(" << &renderer << ") layoutBox(" << &layoutBox << ")";
             stream.nextLine();
             firstMismatchingRect = false;
         }

         stream  << prefix.utf8().data() << "\trenderer->(" << rendererRect.x() << "," << rendererRect.y() << ") (" << rendererRect.width() << "x" << rendererRect.height() << ")"
             << "\tlayout->(" << layoutRect.x() << "," << layoutRect.y() << ") (" << layoutRect.width() << "x" << layoutRect.height() << ")";
         stream.nextLine();
     };

     auto renderBoxLikeMarginBox = [](auto& displayBox) {
         // Produce a RenderBox matching margin box.
         auto borderBox = displayBox.borderBox();

         return Display::Box::Rect {
             borderBox.top() - displayBox.nonCollapsedMarginBefore(),
             borderBox.left() - displayBox.computedMarginStart().valueOr(0),
             displayBox.computedMarginStart().valueOr(0) + borderBox.width() + displayBox.computedMarginEnd().valueOr(0),
             displayBox.nonCollapsedMarginBefore() + borderBox.height() + displayBox.nonCollapsedMarginAfter()
         };
     };

     auto& displayBox = context.displayBoxForLayoutBox(layoutBox);

     auto frameRect = renderer.frameRect();
     // rendering does not offset for relative positioned boxes.
     if (renderer.isInFlowPositioned())
         frameRect.move(renderer.offsetForInFlowPosition());

     if (frameRect != displayBox.rect()) {
         outputRect("frameBox", renderer.frameRect(), displayBox.rect());
         return true;
     }

     if (renderer.borderBoxRect() != displayBox.borderBox()) {
         outputRect("borderBox", renderer.borderBoxRect(), displayBox.borderBox());
         return true;
     }

     if (renderer.paddingBoxRect() != displayBox.paddingBox()) {
         outputRect("paddingBox", renderer.paddingBoxRect(), displayBox.paddingBox());
         return true;
     }

     if (renderer.contentBoxRect() != displayBox.contentBox()) {
         outputRect("contentBox", renderer.contentBoxRect(), displayBox.contentBox());
         return true;
     }

     if (renderer.marginBoxRect() != renderBoxLikeMarginBox(displayBox)) {
         // In certain cases, like out-of-flow boxes with margin auto, marginBoxRect() returns 0. It's clearly incorrect,
         // so let's check the individual margin values instead (and at this point we know that all other boxes match).
         auto marginsMatch = displayBox.marginBefore() == renderer.marginBefore()
             && displayBox.marginAfter() == renderer.marginAfter()
             && displayBox.marginStart() == renderer.marginStart()
             && displayBox.marginEnd() == renderer.marginEnd();

         if (!marginsMatch) {
             outputRect("marginBox", renderer.marginBoxRect(), renderBoxLikeMarginBox(displayBox));
             return true;
         }
     }

     return false;
 }

 static bool verifyAndOutputSubtree(TextStream& stream, const LayoutState& context, const RenderBox& renderer, const Box& layoutBox)
 {
     auto mismtachingGeometry = outputMismatchingBlockBoxInformationIfNeeded(stream, context, renderer, layoutBox);

     if (!is<Container>(layoutBox))
         return mismtachingGeometry;

     auto& container = downcast<Container>(layoutBox);
     auto* childBox = container.firstChild();
     auto* childRenderer = renderer.firstChild();

     while (childRenderer) {
         if (!is<RenderBox>(*childRenderer)) {
             childRenderer = childRenderer->nextSibling();
             continue;
         }

         if (!childBox) {
             stream  << "Trees are out of sync!";
             stream.nextLine();
             return true;
         }

         if (is<RenderBlockFlow>(*childRenderer) && childBox->establishesInlineFormattingContext()) {
             ASSERT(childRenderer->childrenInline());
             auto& blockFlow = downcast<RenderBlockFlow>(*childRenderer);
             auto& formattingRoot = downcast<Container>(*childBox);
             mismtachingGeometry |= blockFlow.lineLayoutPath() == RenderBlockFlow::SimpleLinesPath ? outputMismatchingSimpleLineInformationIfNeeded(stream, context, blockFlow, formattingRoot) : outputMismatchingComplexLineInformationIfNeeded(stream, context, blockFlow, formattingRoot);
         } else {
             auto mismatchingSubtreeGeometry = verifyAndOutputSubtree(stream, context, downcast<RenderBox>(*childRenderer), *childBox);
             mismtachingGeometry |= mismatchingSubtreeGeometry;
         }

         childBox = childBox->nextSibling();
         childRenderer = childRenderer->nextSibling();
     }

     return mismtachingGeometry;
 }

 void LayoutState::verifyAndOutputMismatchingLayoutTree(const RenderView& renderView) const
 {
     TextStream stream;
     auto mismatchingGeometry = verifyAndOutputSubtree(stream, *this, renderView, initialContainingBlock());
     if (!mismatchingGeometry)
         return;
 #if ENABLE(TREE_DEBUGGING)
     showRenderTree(&renderView);
     showLayoutTree(initialContainingBlock(), this);
 #endif
     WTFLogAlways("%s", stream.release().utf8().data());
     ASSERT_NOT_REACHED();
 }

 }
 }

 #endif
	/*
	* Copyright (C) 2018 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 "LayoutState.h"

	#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

	#include "DisplayBox.h"
	#include "InlineTextBox.h"
	#include "LayoutBox.h"
	#include "LayoutContainer.h"
	#include "LayoutTreeBuilder.h"
	#include "RenderBox.h"
	#include "RenderInline.h"
	#include "RenderView.h"
	#include <wtf/text/TextStream.h>

	namespace WebCore {
	namespace Layout {

	static bool areEssentiallyEqual(float a, LayoutUnit b)
	{
	if (a == b.toFloat())
	return true;

	return fabs(a - b.toFloat()) <= 8 * LayoutUnit::epsilon();
	}

	static bool outputMismatchingSimpleLineInformationIfNeeded(TextStream& stream, const LayoutState& layoutState, const RenderBlockFlow& blockFlow, const Container& inlineFormattingRoot)
	{
	auto* lineLayoutData = blockFlow.simpleLineLayout();
	if (!lineLayoutData) {
	ASSERT_NOT_REACHED();
	return true;
	}

	auto& inlineFormattingState = layoutState.establishedFormattingState(inlineFormattingRoot);
	ASSERT(is<InlineFormattingState>(inlineFormattingState));
	auto& inlineRunList = downcast<InlineFormattingState>(inlineFormattingState).inlineRuns();

	if (inlineRunList.size() != lineLayoutData->runCount()) {
	stream << "Mismatching number of runs: simple runs(" << lineLayoutData->runCount() << ") inline runs(" << inlineRunList.size() << ")";
	stream.nextLine();
	return true;
	}

	auto mismatched = false;
	for (unsigned i = 0; i < lineLayoutData->runCount(); ++i) {
	auto& simpleRun = lineLayoutData->runAt(i);
	auto& inlineRun = inlineRunList[i];

	auto matchingRuns = areEssentiallyEqual(simpleRun.logicalLeft, inlineRun.logicalLeft()) && areEssentiallyEqual(simpleRun.logicalRight, inlineRun.logicalRight());
	if (matchingRuns)
	matchingRuns = (simpleRun.start == inlineRun.textContext()->start() && simpleRun.end == (inlineRun.textContext()->start() + inlineRun.textContext()->length()));
	if (matchingRuns)
	continue;

	stream << "Mismatching: simple run(" << simpleRun.start << ", " << simpleRun.end << ") (" << simpleRun.logicalLeft << ", " << simpleRun.logicalRight << ") layout run(" << inlineRun.textContext()->start() << ", " << inlineRun.textContext()->start() + inlineRun.textContext()->length() << ") (" << inlineRun.logicalLeft() << ", " << inlineRun.logicalRight() << ")";
	stream.nextLine();
	mismatched = true;
	}
	return mismatched;
	}

	static bool checkForMatchingNonTextRuns(const InlineRun& inlineRun, const WebCore::InlineBox& inlineBox)
	{
	return areEssentiallyEqual(inlineBox.logicalLeft(), inlineRun.logicalLeft())
	&& areEssentiallyEqual(inlineBox.logicalRight(), inlineRun.logicalRight())
	&& areEssentiallyEqual(inlineBox.logicalHeight(), inlineRun.logicalHeight());
	}

	static bool checkForMatchingTextRuns(const InlineRun& inlineRun, float logicalLeft, float logicalRight, unsigned start, unsigned end, float logicalHeight)
	{
	return areEssentiallyEqual(logicalLeft, inlineRun.logicalLeft())
	&& areEssentiallyEqual(logicalRight, inlineRun.logicalRight())
	&& start == inlineRun.textContext()->start()
	&& (end == (inlineRun.textContext()->start() + inlineRun.textContext()->length()))
	&& areEssentiallyEqual(logicalHeight, inlineRun.logicalHeight());
	}

	static void collectFlowBoxSubtree(const InlineFlowBox& flowbox, Vector<WebCore::InlineBox*>& inlineBoxes)
	{
	auto* inlineBox = flowbox.firstLeafChild();
	auto* lastLeafChild = flowbox.lastLeafChild();
	while (inlineBox) {
	inlineBoxes.append(inlineBox);
	if (inlineBox == lastLeafChild)
	break;
	inlineBox = inlineBox->nextLeafChild();
	}
	}

	static void collectInlineBoxes(const RenderBlockFlow& root, Vector<WebCore::InlineBox*>& inlineBoxes)
	{
	for (auto* rootLine = root.firstRootBox(); rootLine; rootLine = rootLine->nextRootBox()) {
	for (auto* inlineBox = rootLine->firstChild(); inlineBox; inlineBox = inlineBox->nextOnLine()) {
	if (!is<InlineFlowBox>(inlineBox)) {
	inlineBoxes.append(inlineBox);
	continue;
	}
	collectFlowBoxSubtree(downcast<InlineFlowBox>(*inlineBox), inlineBoxes);
	}
	}
	}

	static LayoutUnit resolveForRelativePositionIfNeeded(const InlineTextBox& inlineTextBox)
	{
	LayoutUnit xOffset;
	auto* parent = inlineTextBox.parent();
	while (is<InlineFlowBox>(parent)) {
	auto& renderer = parent->renderer();
	if (renderer.isInFlowPositioned())
	xOffset = renderer.offsetForInFlowPosition().width();
	parent = parent->parent();
	}
	return xOffset;
	}

	static bool outputMismatchingComplexLineInformationIfNeeded(TextStream& stream, const LayoutState& layoutState, const RenderBlockFlow& blockFlow, const Container& inlineFormattingRoot)
	{
	auto& inlineFormattingState = layoutState.establishedFormattingState(inlineFormattingRoot);
	ASSERT(is<InlineFormattingState>(inlineFormattingState));
	auto& inlineRunList = downcast<InlineFormattingState>(inlineFormattingState).inlineRuns();

	// Collect inlineboxes.
	Vector<WebCore::InlineBox*> inlineBoxes;
	collectInlineBoxes(blockFlow, inlineBoxes);

	auto mismatched = false;
	unsigned runIndex = 0;

	if (inlineBoxes.size() != inlineRunList.size()) {
	stream << "Warning: mismatching number of runs: inlineboxes(" << inlineBoxes.size() << ") vs. inline runs(" << inlineRunList.size() << ")";
	stream.nextLine();
	}

	for (unsigned inlineBoxIndex = 0; inlineBoxIndex < inlineBoxes.size() && runIndex < inlineRunList.size(); ++inlineBoxIndex) {
	auto* inlineBox = inlineBoxes[inlineBoxIndex];
	auto* inlineTextBox = is<InlineTextBox>(inlineBox) ? downcast<InlineTextBox>(inlineBox) : nullptr;

	auto& inlineRun = inlineRunList[runIndex];
	auto matchingRuns = false;
	if (inlineTextBox) {
	auto xOffset = resolveForRelativePositionIfNeeded(*inlineTextBox);
	matchingRuns = checkForMatchingTextRuns(inlineRun, inlineTextBox->logicalLeft() + xOffset,
	inlineTextBox->logicalRight() + xOffset,
	inlineTextBox->start(),
	inlineTextBox->end() + 1,
	inlineTextBox->logicalHeight());

	// <span>foobar</span>foobar generates 2 inline text boxes while we only generate one inline run.
	// also <div>foo<img style="float: left;">bar</div> too.
	auto inlineRunEnd = inlineRun.textContext()->start() + inlineRun.textContext()->length();
	auto textRunMightBeExtended = !matchingRuns && inlineTextBox->end() < inlineRunEnd && inlineBoxIndex < inlineBoxes.size() - 1;

	if (textRunMightBeExtended) {
	auto logicalLeft = inlineTextBox->logicalLeft() + xOffset;
	auto logicalRight = inlineTextBox->logicalRight() + xOffset;
	auto start = inlineTextBox->start();
	auto end = inlineTextBox->end() + 1;
	auto index = ++inlineBoxIndex;
	for (; index < inlineBoxes.size(); ++index) {
	auto* inlineBox = inlineBoxes[index];
	auto* inlineTextBox = is<InlineTextBox>(inlineBox) ? downcast<InlineTextBox>(inlineBox) : nullptr;
	// Can't mix different inline boxes.
	if (!inlineTextBox)
	break;

	auto xOffset = resolveForRelativePositionIfNeeded(*inlineTextBox);
	logicalRight = inlineTextBox->logicalRight() + xOffset;
	end += (inlineTextBox->end() + 1);
	if (checkForMatchingTextRuns(inlineRun, logicalLeft, logicalRight, start, end, inlineTextBox->logicalHeight())) {
	matchingRuns = true;
	inlineBoxIndex = index;
	break;
	}

	// Went too far?
	if (end >= inlineRunEnd)
	break;
	}
	}
	} else
	matchingRuns = checkForMatchingNonTextRuns(inlineRun, *inlineBox);


	if (!matchingRuns) {
	stream << "Mismatching: run ";

	if (inlineTextBox)
	stream << "(" << inlineTextBox->start() << ", " << inlineTextBox->end() + 1 << ")";
	stream << " (" << inlineBox->logicalLeft() << ", " << inlineBox->logicalRight() << ") (" << inlineBox->logicalWidth() << "x" << inlineBox->logicalHeight() << ")";

	stream << "inline run ";
	if (inlineRun.textContext())
	stream << "(" << inlineRun.textContext()->start() << ", " << inlineRun.textContext()->start() + inlineRun.textContext()->length() << ") ";
	stream << "(" << inlineRun.logicalLeft() << ", " << inlineRun.logicalRight() << ") (" << inlineRun.logicalWidth() << "x" << inlineRun.logicalHeight() << ")";
	stream.nextLine();
	mismatched = true;
	}
	++runIndex;
	}
	return mismatched;
	}

	static bool outputMismatchingBlockBoxInformationIfNeeded(TextStream& stream, const LayoutState& context, const RenderBox& renderer, const Box& layoutBox)
	{
	bool firstMismatchingRect = true;
	auto outputRect = [&] (const String& prefix, const LayoutRect& rendererRect, const LayoutRect& layoutRect) {
	if (firstMismatchingRect) {
	stream << (renderer.element() ? renderer.element()->nodeName().utf8().data() : "") << " " << renderer.renderName() << "(" << &renderer << ") layoutBox(" << &layoutBox << ")";
	stream.nextLine();
	firstMismatchingRect = false;
	}

	stream << prefix.utf8().data() << "\trenderer->(" << rendererRect.x() << "," << rendererRect.y() << ") (" << rendererRect.width() << "x" << rendererRect.height() << ")"
	<< "\tlayout->(" << layoutRect.x() << "," << layoutRect.y() << ") (" << layoutRect.width() << "x" << layoutRect.height() << ")";
	stream.nextLine();
	};

	auto renderBoxLikeMarginBox = [](auto& displayBox) {
	// Produce a RenderBox matching margin box.
	auto borderBox = displayBox.borderBox();

	return Display::Box::Rect {
	borderBox.top() - displayBox.nonCollapsedMarginBefore(),
	borderBox.left() - displayBox.computedMarginStart().valueOr(0),
	displayBox.computedMarginStart().valueOr(0) + borderBox.width() + displayBox.computedMarginEnd().valueOr(0),
	displayBox.nonCollapsedMarginBefore() + borderBox.height() + displayBox.nonCollapsedMarginAfter()
	};
	};

	auto& displayBox = context.displayBoxForLayoutBox(layoutBox);

	auto frameRect = renderer.frameRect();
	// rendering does not offset for relative positioned boxes.
	if (renderer.isInFlowPositioned())
	frameRect.move(renderer.offsetForInFlowPosition());

	if (frameRect != displayBox.rect()) {
	outputRect("frameBox", renderer.frameRect(), displayBox.rect());
	return true;
	}

	if (renderer.borderBoxRect() != displayBox.borderBox()) {
	outputRect("borderBox", renderer.borderBoxRect(), displayBox.borderBox());
	return true;
	}

	if (renderer.paddingBoxRect() != displayBox.paddingBox()) {
	outputRect("paddingBox", renderer.paddingBoxRect(), displayBox.paddingBox());
	return true;
	}

	if (renderer.contentBoxRect() != displayBox.contentBox()) {
	outputRect("contentBox", renderer.contentBoxRect(), displayBox.contentBox());
	return true;
	}

	if (renderer.marginBoxRect() != renderBoxLikeMarginBox(displayBox)) {
	// In certain cases, like out-of-flow boxes with margin auto, marginBoxRect() returns 0. It's clearly incorrect,
	// so let's check the individual margin values instead (and at this point we know that all other boxes match).
	auto marginsMatch = displayBox.marginBefore() == renderer.marginBefore()
	&& displayBox.marginAfter() == renderer.marginAfter()
	&& displayBox.marginStart() == renderer.marginStart()
	&& displayBox.marginEnd() == renderer.marginEnd();

	if (!marginsMatch) {
	outputRect("marginBox", renderer.marginBoxRect(), renderBoxLikeMarginBox(displayBox));
	return true;
	}
	}

	return false;
	}

	static bool verifyAndOutputSubtree(TextStream& stream, const LayoutState& context, const RenderBox& renderer, const Box& layoutBox)
	{
	auto mismtachingGeometry = outputMismatchingBlockBoxInformationIfNeeded(stream, context, renderer, layoutBox);

	if (!is<Container>(layoutBox))
	return mismtachingGeometry;

	auto& container = downcast<Container>(layoutBox);
	auto* childBox = container.firstChild();
	auto* childRenderer = renderer.firstChild();

	while (childRenderer) {
	if (!is<RenderBox>(*childRenderer)) {
	childRenderer = childRenderer->nextSibling();
	continue;
	}

	if (!childBox) {
	stream << "Trees are out of sync!";
	stream.nextLine();
	return true;
	}

	if (is<RenderBlockFlow>(*childRenderer) && childBox->establishesInlineFormattingContext()) {
	ASSERT(childRenderer->childrenInline());
	auto& blockFlow = downcast<RenderBlockFlow>(*childRenderer);
	auto& formattingRoot = downcast<Container>(*childBox);
	mismtachingGeometry \|= blockFlow.lineLayoutPath() == RenderBlockFlow::SimpleLinesPath ? outputMismatchingSimpleLineInformationIfNeeded(stream, context, blockFlow, formattingRoot) : outputMismatchingComplexLineInformationIfNeeded(stream, context, blockFlow, formattingRoot);
	} else {
	auto mismatchingSubtreeGeometry = verifyAndOutputSubtree(stream, context, downcast<RenderBox>(childRenderer), childBox);
	mismtachingGeometry \|= mismatchingSubtreeGeometry;
	}

	childBox = childBox->nextSibling();
	childRenderer = childRenderer->nextSibling();
	}

	return mismtachingGeometry;
	}

	void LayoutState::verifyAndOutputMismatchingLayoutTree(const RenderView& renderView) const
	{
	TextStream stream;
	auto mismatchingGeometry = verifyAndOutputSubtree(stream, *this, renderView, initialContainingBlock());
	if (!mismatchingGeometry)
	return;
	#if ENABLE(TREE_DEBUGGING)
	showRenderTree(&renderView);
	showLayoutTree(initialContainingBlock(), this);
	#endif
	WTFLogAlways("%s", stream.release().utf8().data());
	ASSERT_NOT_REACHED();
	}

	}
	}

	#endif