*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 24 matching lines @@
 #include "core/html/HTMLFrameElementBase.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/frame/Frame.h"
 #include "core/frame/FrameView.h"
 #include "core/page/AutoscrollController.h"
 #include "core/page/EventHandler.h"
 #include "core/page/Page.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/LayoutRectRecorder.h"
 #include "core/rendering/PaintInfo.h"
-#include "core/rendering/RenderBoxRegionInfo.h"
 #include "core/rendering/RenderFlexibleBox.h"
-#include "core/rendering/RenderFlowThread.h"
 #include "core/rendering/RenderGeometryMap.h"
 #include "core/rendering/RenderGrid.h"
 #include "core/rendering/RenderInline.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderLayerCompositor.h"
 #include "core/rendering/RenderListMarker.h"
-#include "core/rendering/RenderRegion.h"
 #include "core/rendering/RenderTableCell.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 #include "platform/LengthFunctions.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/TransformState.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 
 using namespace std;
 
@@ skipping 34 matching lines @@
     , m_intrinsicContentLogicalHeight(-1)
     , m_inlineBoxWrapper(0)
 {
     setIsBox();
 }
 
 RenderBox::~RenderBox()
 {
 }
 
-LayoutRect RenderBox::borderBoxRectInRegion(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
-{
-    if (!region)
-        return borderBoxRect();
-
-    // Compute the logical width and placement in this region.
-    RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(region, cacheFlag);
-    if (!boxInfo)
-        return borderBoxRect();
-
-    // We have cached insets.
-    LayoutUnit logicalWidth = boxInfo->logicalWidth();
-    LayoutUnit logicalLeft = boxInfo->logicalLeft();
-
-    // Now apply the parent inset since it is cumulative whenever anything in the containing block chain shifts.
-    // FIXME: Doesn't work right with perpendicular writing modes.
-    const RenderBlock* currentBox = containingBlock();
-    RenderBoxRegionInfo* currentBoxInfo = currentBox->renderBoxRegionInfo(region);
-    while (currentBoxInfo && currentBoxInfo->isShifted()) {
-        if (currentBox->style()->direction() == LTR)
-            logicalLeft += currentBoxInfo->logicalLeft();
-        else
-            logicalLeft -= (currentBox->logicalWidth() - currentBoxInfo->logicalWidth()) - currentBoxInfo->logicalLeft();
-        currentBox = currentBox->containingBlock();
-        region = currentBox->clampToStartAndEndRegions(region);
-        currentBoxInfo = currentBox->renderBoxRegionInfo(region);
-    }
-
-    if (cacheFlag == DoNotCacheRenderBoxRegionInfo)
-        delete boxInfo;
-
-    if (isHorizontalWritingMode())
-        return LayoutRect(logicalLeft, 0, logicalWidth, height());
-    return LayoutRect(0, logicalLeft, width(), logicalWidth);
-}
-
-void RenderBox::clearRenderBoxRegionInfo()
-{
-    if (isRenderFlowThread())
-        return;
-
-    RenderFlowThread* flowThread = flowThreadContainingBlock();
-    if (flowThread)
-        flowThread->removeRenderBoxRegionInfo(this);
-}
-
 void RenderBox::willBeDestroyed()
 {
     clearOverrideSize();
     clearContainingBlockOverrideSize();
 
     RenderBlock::removePercentHeightDescendantIfNeeded(this);
 
     ShapeOutsideInfo::removeInfo(this);
 
     RenderBoxModelObject::willBeDestroyed();
@@ skipping 430 matching lines @@
     quads.append(localToAbsoluteQuad(FloatRect(0, 0, width(), height()), 0 /* mode */, wasFixed));
 }
 
 void RenderBox::updateLayerTransform()
 {
     // Transform-origin depends on box size, so we need to update the layer transform after layout.
     if (hasLayer())
         layer()->updateTransform();
 }
 
-LayoutUnit RenderBox::constrainLogicalWidthInRegionByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock* cb, RenderRegion* region) const
+LayoutUnit RenderBox::constrainLogicalWidthByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock* cb) const
 {
     RenderStyle* styleToUse = style();
     if (!styleToUse->logicalMaxWidth().isUndefined())
-        logicalWidth = min(logicalWidth, computeLogicalWidthInRegionUsing(MaxSize, styleToUse->logicalMaxWidth(), availableWidth, cb, region));
-    return max(logicalWidth, computeLogicalWidthInRegionUsing(MinSize, styleToUse->logicalMinWidth(), availableWidth, cb, region));
+        logicalWidth = min(logicalWidth, computeLogicalWidthUsing(MaxSize, styleToUse->logicalMaxWidth(), availableWidth, cb));
+    return max(logicalWidth, computeLogicalWidthUsing(MinSize, styleToUse->logicalMinWidth(), availableWidth, cb));
 }
 
 LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
 {
     RenderStyle* styleToUse = style();
     if (!styleToUse->logicalMaxHeight().isUndefined()) {
         LayoutUnit maxH = computeLogicalHeightUsing(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
         if (maxH != -1)
             logicalHeight = min(logicalHeight, maxH);
     }
@@ skipping 556 matching lines @@
     // Check kids first.
     for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
         if (!child->hasLayer() && child->nodeAtPoint(request, result, locationInContainer, adjustedLocation, action)) {
             updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
             return true;
         }
     }
 
     // Check our bounds next. For this purpose always assume that we can only be hit in the
     // foreground phase (which is true for replaced elements like images).
-    LayoutRect boundsRect = borderBoxRectInRegion(locationInContainer.region());
+    LayoutRect boundsRect = borderBoxRect();
     boundsRect.moveBy(adjustedLocation);
     if (visibleToHitTestRequest(request) && action == HitTestForeground && locationInContainer.intersects(boundsRect)) {
         updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
         if (!result.addNodeToRectBasedTestResult(node(), request, locationInContainer, boundsRect))
             return true;
     }
 
     return false;
 }
 
@@ skipping 55 matching lines @@
         return BackgroundBleedBackgroundOverBorder;
 
     return BackgroundBleedUseTransparencyLayer;
 }
 
 void RenderBox::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     if (!paintInfo.shouldPaintWithinRoot(this))
         return;
 
-    LayoutRect paintRect = borderBoxRectInRegion(paintInfo.renderRegion);
+    LayoutRect paintRect = borderBoxRect();
     paintRect.moveBy(paintOffset);
     paintBoxDecorationsWithRect(paintInfo, paintOffset, paintRect);
 }
 
 void RenderBox::paintBoxDecorationsWithRect(PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
 {
     BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context);
 
     // FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
     // custom shadows of their own.
@@ skipping 408 matching lines @@
 {
     if (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseSelfOutline || paintInfo.phase == PaintPhaseMask)
         return false;
 
     bool isControlClip = hasControlClip();
     bool isOverflowClip = hasOverflowClip() && !layer()->isSelfPaintingLayer();
 
     if (!isControlClip && !isOverflowClip)
         return false;
 
-    LayoutRect clipRect = isControlClip ? controlClipRect(accumulatedOffset) : overflowClipRect(accumulatedOffset, paintInfo.renderRegion);
+    LayoutRect clipRect = isControlClip ? controlClipRect(accumulatedOffset) : overflowClipRect(accumulatedOffset);
     RoundedRect clipRoundedRect(0, 0, 0, 0);
     bool hasBorderRadius = style()->hasBorderRadius();
     if (hasBorderRadius)
         clipRoundedRect = style()->getRoundedInnerBorderFor(LayoutRect(accumulatedOffset, size()));
 
     if (contentsClipBehavior == SkipContentsClipIfPossible) {
         LayoutRect contentsVisualOverflow = contentsVisualOverflowRect();
         if (contentsVisualOverflow.isEmpty())
             return false;
 
@@ skipping 32 matching lines @@
 
     paintInfo.context->restore();
     if (originalPhase == PaintPhaseOutline) {
         paintInfo.phase = PaintPhaseSelfOutline;
         paintObject(paintInfo, accumulatedOffset);
         paintInfo.phase = originalPhase;
     } else if (originalPhase == PaintPhaseChildBlockBackground)
         paintInfo.phase = originalPhase;
 }
 
-LayoutRect RenderBox::overflowClipRect(const LayoutPoint& location, RenderRegion* region, OverlayScrollbarSizeRelevancy relevancy)
+LayoutRect RenderBox::overflowClipRect(const LayoutPoint& location, OverlayScrollbarSizeRelevancy relevancy)
 {
     // FIXME: When overflow-clip (CSS3) is implemented, we'll obtain the property
     // here.
-    LayoutRect clipRect = borderBoxRectInRegion(region);
+    LayoutRect clipRect = borderBoxRect();
     clipRect.setLocation(location + clipRect.location() + LayoutSize(borderLeft(), borderTop()));
     clipRect.setSize(clipRect.size() - LayoutSize(borderLeft() + borderRight(), borderTop() + borderBottom()));
 
     if (!hasOverflowClip())
         return clipRect;
 
     // Subtract out scrollbars if we have them.
     if (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
         clipRect.move(layer()->scrollableArea()->verticalScrollbarWidth(relevancy), 0);
     clipRect.contract(layer()->scrollableArea()->verticalScrollbarWidth(relevancy), layer()->scrollableArea()->horizontalScrollbarHeight(relevancy));
 
     return clipRect;
 }
 
-LayoutRect RenderBox::clipRect(const LayoutPoint& location, RenderRegion* region)
+LayoutRect RenderBox::clipRect(const LayoutPoint& location)
 {
-    LayoutRect borderBoxRect = borderBoxRectInRegion(region);
-    LayoutRect clipRect = LayoutRect(borderBoxRect.location() + location, borderBoxRect.size());
+    LayoutRect borderBox = borderBoxRect();
+    LayoutRect clipRect = LayoutRect(borderBox.location() + location, borderBox.size());
 
     if (!style()->clipLeft().isAuto()) {
-        LayoutUnit c = valueForLength(style()->clipLeft(), borderBoxRect.width());
+        LayoutUnit c = valueForLength(style()->clipLeft(), borderBox.width());
         clipRect.move(c, 0);
         clipRect.contract(c, 0);
     }
 
-    // We don't use the region-specific border box's width and height since clip offsets are (stupidly) specified
-    // from the left and top edges. Therefore it's better to avoid constraining to smaller widths and heights.
-
     if (!style()->clipRight().isAuto())
         clipRect.contract(width() - valueForLength(style()->clipRight(), width()), 0);
 
     if (!style()->clipTop().isAuto()) {
-        LayoutUnit c = valueForLength(style()->clipTop(), borderBoxRect.height());
+        LayoutUnit c = valueForLength(style()->clipTop(), borderBox.height());
         clipRect.move(0, c);
         clipRect.contract(0, c);
     }
 
     if (!style()->clipBottom().isAuto())
         clipRect.contract(0, height() - valueForLength(style()->clipBottom(), height()));
 
     return clipRect;
 }
 
-LayoutUnit RenderBox::shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlockFlow* cb, RenderRegion* region) const
+LayoutUnit RenderBox::shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlockFlow* cb) const
 {
-    RenderRegion* containingBlockRegion = 0;
     LayoutUnit logicalTopPosition = logicalTop();
-    if (region) {
-        LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
-        logicalTopPosition = max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
-        containingBlockRegion = cb->clampToStartAndEndRegions(region);
-    }
-
-    LayoutUnit result = cb->availableLogicalWidthForLineInRegion(logicalTopPosition, false, containingBlockRegion) - childMarginStart - childMarginEnd;
+    LayoutUnit result = cb->availableLogicalWidthForLine(logicalTopPosition, false) - childMarginStart - childMarginEnd;
 
     // We need to see if margins on either the start side or the end side can contain the floats in question. If they can,
     // then just using the line width is inaccurate. In the case where a float completely fits, we don't need to use the line
     // offset at all, but can instead push all the way to the content edge of the containing block. In the case where the float
     // doesn't fit, we can use the line offset, but we need to grow it by the margin to reflect the fact that the margin was
     // "consumed" by the float. Negative margins aren't consumed by the float, and so we ignore them.
     if (childMarginStart > 0) {
-        LayoutUnit startContentSide = cb->startOffsetForContent(containingBlockRegion);
+        LayoutUnit startContentSide = cb->startOffsetForContent();
         LayoutUnit startContentSideWithMargin = startContentSide + childMarginStart;
-        LayoutUnit startOffset = cb->startOffsetForLineInRegion(logicalTopPosition, false, containingBlockRegion);
+        LayoutUnit startOffset = cb->startOffsetForLine(logicalTopPosition, false);
         if (startOffset > startContentSideWithMargin)
             result += childMarginStart;
         else
             result += startOffset - startContentSide;
     }
 
     if (childMarginEnd > 0) {
-        LayoutUnit endContentSide = cb->endOffsetForContent(containingBlockRegion);
+        LayoutUnit endContentSide = cb->endOffsetForContent();
         LayoutUnit endContentSideWithMargin = endContentSide + childMarginEnd;
-        LayoutUnit endOffset = cb->endOffsetForLineInRegion(logicalTopPosition, false, containingBlockRegion);
+        LayoutUnit endOffset = cb->endOffsetForLine(logicalTopPosition, false);
         if (endOffset > endContentSideWithMargin)
             result += childMarginEnd;
         else
             result += endOffset - endContentSide;
     }
 
     return result;
 }
 
 LayoutUnit RenderBox::containingBlockLogicalWidthForContent() const
 {
     if (hasOverrideContainingBlockLogicalWidth())
         return overrideContainingBlockContentLogicalWidth();
 
     RenderBlock* cb = containingBlock();
     return cb->availableLogicalWidth();
 }
 
 LayoutUnit RenderBox::containingBlockLogicalHeightForContent(AvailableLogicalHeightType heightType) const
 {
     if (hasOverrideContainingBlockLogicalHeight())
         return overrideContainingBlockContentLogicalHeight();
 
     RenderBlock* cb = containingBlock();
     return cb->availableLogicalHeight(heightType);
 }
 
-LayoutUnit RenderBox::containingBlockLogicalWidthForContentInRegion(RenderRegion* region) const
-{
-    if (!region)
-        return containingBlockLogicalWidthForContent();
-
-    RenderBlock* cb = containingBlock();
-    RenderRegion* containingBlockRegion = cb->clampToStartAndEndRegions(region);
-    // FIXME: It's unclear if a region's content should use the containing block's override logical width.
-    // If it should, the following line should call containingBlockLogicalWidthForContent.
-    LayoutUnit result = cb->availableLogicalWidth();
-    RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(containingBlockRegion);
-    if (!boxInfo)
-        return result;
-    return max<LayoutUnit>(0, result - (cb->logicalWidth() - boxInfo->logicalWidth()));
-}
-
-LayoutUnit RenderBox::containingBlockAvailableLineWidthInRegion(RenderRegion* region) const
+LayoutUnit RenderBox::containingBlockAvailableLineWidth() const
 {
     RenderBlock* cb = containingBlock();
-    RenderRegion* containingBlockRegion = 0;
     LayoutUnit logicalTopPosition = logicalTop();
-    if (region) {
-        LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
-        logicalTopPosition = max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
-        containingBlockRegion = cb->clampToStartAndEndRegions(region);
-    }
     if (cb->isRenderBlockFlow())
-        return toRenderBlockFlow(cb)->availableLogicalWidthForLineInRegion(logicalTopPosition, false, containingBlockRegion, availableLogicalHeight(IncludeMarginBorderPadding));
+        return toRenderBlockFlow(cb)->availableLogicalWidthForLine(logicalTopPosition, false, availableLogicalHeight(IncludeMarginBorderPadding));
     return 0;
 }
 
 LayoutUnit RenderBox::perpendicularContainingBlockLogicalHeight() const
 {
     if (hasOverrideContainingBlockLogicalHeight())
         return overrideContainingBlockContentLogicalHeight();
 
     RenderBlock* cb = containingBlock();
     if (cb->hasOverrideHeight())
@@ skipping 81 matching lines @@
         // and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
         mode &= ~IsFixed;
     } else if (isFixedPos)
         mode |= IsFixed;
 
     RenderBoxModelObject::mapAbsoluteToLocalPoint(mode, transformState);
 }
 
 LayoutSize RenderBox::offsetFromContainer(RenderObject* o, const LayoutPoint& point, bool* offsetDependsOnPoint) const
 {
-    // A region "has" boxes inside it without being their container.
-    // FIXME: change container() / containingBlock() to count for boxes being positioned relative to the region, not the
-    // FlowThread. This requires a separate patch as a simple test with such a change in container() causes 129 out of
-    // 337 regions tests to fail.
-    ASSERT(o == container() || o->isRenderRegion());
-
-    LayoutSize offset;
+   LayoutSize offset;
     if (isInFlowPositioned())
         offset += offsetForInFlowPosition();
 
     if (!isInline() || isReplaced()) {
         if (!style()->hasOutOfFlowPosition() && o->hasColumns()) {
             RenderBlock* block = toRenderBlock(o);
             LayoutRect columnRect(frameRect());
             block->adjustStartEdgeForWritingModeIncludingColumns(columnRect);
             offset += toSize(columnRect.location());
             LayoutPoint columnPoint = block->flipForWritingModeIncludingColumns(point + offset);
             offset = toLayoutSize(block->flipForWritingModeIncludingColumns(toLayoutPoint(offset)));
             o->adjustForColumns(offset, columnPoint);
             offset = block->flipForWritingMode(offset);
 
             if (offsetDependsOnPoint)
                 *offsetDependsOnPoint = true;
         } else
             offset += topLeftLocationOffset();
     }
 
     if (o->hasOverflowClip())
         offset -= toRenderBox(o)->scrolledContentOffset();
 
     if (style()->position() == AbsolutePosition && o->isInFlowPositioned() && o->isRenderInline())
         offset += toRenderInline(o)->offsetForInFlowPositionedInline(this);
 
-    if (offsetDependsOnPoint)
-        *offsetDependsOnPoint |= o->isRenderFlowThread();
-
     return offset;
 }
 
 InlineBox* RenderBox::createInlineBox()
 {
     return new InlineBox(this);
 }
 
 void RenderBox::dirtyLineBoxes(bool fullLayout)
 {
@@ skipping 190 matching lines @@
     }
 }
 
 void RenderBox::repaintOverhangingFloats(bool)
 {
 }
 
 void RenderBox::updateLogicalWidth()
 {
     LogicalExtentComputedValues computedValues;
-    computeLogicalWidthInRegion(computedValues);
+    computeLogicalWidth(computedValues);
 
     setLogicalWidth(computedValues.m_extent);
     setLogicalLeft(computedValues.m_position);
     setMarginStart(computedValues.m_margins.m_start);
     setMarginEnd(computedValues.m_margins.m_end);
 }
 
 static float getMaxWidthListMarker(const RenderBox* renderer)
 {
 #ifndef NDEBUG
@@ skipping 19 matching lines @@
                 // Make sure to compute the autosized width.
                 itemMarker->layout();
             }
             maxWidth = max<float>(maxWidth, toRenderListMarker(itemMarker)->logicalWidth().toFloat());
             break;
         }
     }
     return maxWidth;
 }
 
-void RenderBox::computeLogicalWidthInRegion(LogicalExtentComputedValues& computedValues, RenderRegion* region) const
+void RenderBox::computeLogicalWidth(LogicalExtentComputedValues& computedValues) const
 {
     computedValues.m_extent = logicalWidth();
     computedValues.m_position = logicalLeft();
     computedValues.m_margins.m_start = marginStart();
     computedValues.m_margins.m_end = marginEnd();
 
     if (isOutOfFlowPositioned()) {
         // FIXME: This calculation is not patched for block-flow yet.
         // https://bugs.webkit.org/show_bug.cgi?id=46500
-        computePositionedLogicalWidth(computedValues, region);
+        computePositionedLogicalWidth(computedValues);
         return;
     }
 
     // If layout is limited to a subtree, the subtree root's logical width does not change.
     if (node() && view()->frameView() && view()->frameView()->layoutRoot(true) == this)
         return;
 
     // The parent box is flexing us, so it has increased or decreased our
     // width.  Use the width from the style context.
     // FIXME: Account for block-flow in flexible boxes.
     // https://bugs.webkit.org/show_bug.cgi?id=46418
     if (hasOverrideWidth() && (style()->borderFit() == BorderFitLines || parent()->isFlexibleBoxIncludingDeprecated())) {
         computedValues.m_extent = overrideLogicalContentWidth() + borderAndPaddingLogicalWidth();
         return;
     }
 
     // FIXME: Account for block-flow in flexible boxes.
     // https://bugs.webkit.org/show_bug.cgi?id=46418
     bool inVerticalBox = parent()->isDeprecatedFlexibleBox() && (parent()->style()->boxOrient() == VERTICAL);
     bool stretching = (parent()->style()->boxAlign() == BSTRETCH);
     bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inVerticalBox || !stretching);
 
     RenderStyle* styleToUse = style();
     Length logicalWidthLength = treatAsReplaced ? Length(computeReplacedLogicalWidth(), Fixed) : styleToUse->logicalWidth();
 
     RenderBlock* cb = containingBlock();
-    LayoutUnit containerLogicalWidth = max<LayoutUnit>(0, containingBlockLogicalWidthForContentInRegion(region));
+    LayoutUnit containerLogicalWidth = max<LayoutUnit>(0, containingBlockLogicalWidthForContent());
     bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
 
     if (isInline() && !isInlineBlockOrInlineTable()) {
         // just calculate margins
         computedValues.m_margins.m_start = minimumValueForLength(styleToUse->marginStart(), containerLogicalWidth);
         computedValues.m_margins.m_end = minimumValueForLength(styleToUse->marginEnd(), containerLogicalWidth);
         if (treatAsReplaced)
             computedValues.m_extent = max<LayoutUnit>(floatValueForLength(logicalWidthLength, 0) + borderAndPaddingLogicalWidth(), minPreferredLogicalWidth());
         return;
     }
 
     // Width calculations
     if (treatAsReplaced)
         computedValues.m_extent = logicalWidthLength.value() + borderAndPaddingLogicalWidth();
     else {
         LayoutUnit containerWidthInInlineDirection = containerLogicalWidth;
         if (hasPerpendicularContainingBlock)
             containerWidthInInlineDirection = perpendicularContainingBlockLogicalHeight();
-        LayoutUnit preferredWidth = computeLogicalWidthInRegionUsing(MainOrPreferredSize, styleToUse->logicalWidth(), containerWidthInInlineDirection, cb, region);
-        computedValues.m_extent = constrainLogicalWidthInRegionByMinMax(preferredWidth, containerWidthInInlineDirection, cb, region);
+        LayoutUnit preferredWidth = computeLogicalWidthUsing(MainOrPreferredSize, styleToUse->logicalWidth(), containerWidthInInlineDirection, cb);
+        computedValues.m_extent = constrainLogicalWidthByMinMax(preferredWidth, containerWidthInInlineDirection, cb);
     }
 
     // Margin calculations.
     if (hasPerpendicularContainingBlock || isFloating() || isInline()) {
         computedValues.m_margins.m_start = minimumValueForLength(styleToUse->marginStart(), containerLogicalWidth);
         computedValues.m_margins.m_end = minimumValueForLength(styleToUse->marginEnd(), containerLogicalWidth);
     } else {
         LayoutUnit containerLogicalWidthForAutoMargins = containerLogicalWidth;
         if (avoidsFloats() && cb->containsFloats())
-            containerLogicalWidthForAutoMargins = containingBlockAvailableLineWidthInRegion(region);
+            containerLogicalWidthForAutoMargins = containingBlockAvailableLineWidth();
         bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
         computeInlineDirectionMargins(cb, containerLogicalWidthForAutoMargins, computedValues.m_extent,
             hasInvertedDirection ? computedValues.m_margins.m_end : computedValues.m_margins.m_start,
             hasInvertedDirection ? computedValues.m_margins.m_start : computedValues.m_margins.m_end);
     }
 
     if (!hasPerpendicularContainingBlock && containerLogicalWidth && containerLogicalWidth != (computedValues.m_extent + computedValues.m_margins.m_start + computedValues.m_margins.m_end)
         && !isFloating() && !isInline() && !cb->isFlexibleBoxIncludingDeprecated() && !cb->isRenderGrid()) {
         LayoutUnit newMargin = containerLogicalWidth - computedValues.m_extent - cb->marginStartForChild(this);
         bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
@@ skipping 49 matching lines @@
     if (logicalWidthLength.type() == FitContent) {
         minLogicalWidth += borderAndPadding;
         maxLogicalWidth += borderAndPadding;
         return max(minLogicalWidth, min(maxLogicalWidth, fillAvailableMeasure(availableLogicalWidth)));
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
-LayoutUnit RenderBox::computeLogicalWidthInRegionUsing(SizeType widthType, Length logicalWidth, LayoutUnit availableLogicalWidth,
-    const RenderBlock* cb, RenderRegion* region) const
+LayoutUnit RenderBox::computeLogicalWidthUsing(SizeType widthType, Length logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* cb) const
 {
     if (!logicalWidth.isIntrinsicOrAuto()) {
         // FIXME: If the containing block flow is perpendicular to our direction we need to use the available logical height instead.
         return adjustBorderBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, availableLogicalWidth));
     }
 
     if (logicalWidth.isIntrinsic())
         return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth());
 
     LayoutUnit marginStart = 0;
     LayoutUnit marginEnd = 0;
     LayoutUnit logicalWidthResult = fillAvailableMeasure(availableLogicalWidth, marginStart, marginEnd);
 
     if (shrinkToAvoidFloats() && cb->containsFloats())
-        logicalWidthResult = min(logicalWidthResult, shrinkLogicalWidthToAvoidFloats(marginStart, marginEnd, toRenderBlockFlow(cb), region));
+        logicalWidthResult = min(logicalWidthResult, shrinkLogicalWidthToAvoidFloats(marginStart, marginEnd, toRenderBlockFlow(cb)));
 
     if (widthType == MainOrPreferredSize && sizesLogicalWidthToFitContent(widthType))
         return max(minPreferredLogicalWidth(), min(maxPreferredLogicalWidth(), logicalWidthResult));
     return logicalWidthResult;
 }
 
 static bool columnFlexItemHasStretchAlignment(const RenderObject* flexitem)
 {
     RenderObject* parent = flexitem->parent();
     // auto margins mean we don't stretch. Note that this function will only be used for
@@ skipping 127 matching lines @@
         marginStart = containerWidth - childWidth - marginEnd;
         return;
     }
 
     // Case Four: Either no auto margins, or our width is >= the container width (css2.1, 10.3.3).  In that case
     // auto margins will just turn into 0.
     marginStart = minimumValueForLength(marginStartLength, containerWidth);
     marginEnd = minimumValueForLength(marginEndLength, containerWidth);
 }
 
-RenderBoxRegionInfo* RenderBox::renderBoxRegionInfo(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
-{
-    // Make sure nobody is trying to call this with a null region.
-    if (!region)
-        return 0;
-
-    // If we have computed our width in this region already, it will be cached, and we can
-    // just return it.
-    RenderBoxRegionInfo* boxInfo = region->renderBoxRegionInfo(this);
-    if (boxInfo && cacheFlag == CacheRenderBoxRegionInfo)
-        return boxInfo;
-
-    // No cached value was found, so we have to compute our insets in this region.
-    // FIXME: For now we limit this computation to normal RenderBlocks. Future patches will expand
-    // support to cover all boxes.
-    RenderFlowThread* flowThread = flowThreadContainingBlock();
-    if (isRenderFlowThread() || !flowThread || !canHaveBoxInfoInRegion() || flowThread->style()->writingMode() != style()->writingMode())
-        return 0;
-
-    LogicalExtentComputedValues computedValues;
-    computeLogicalWidthInRegion(computedValues, region);
-
-    // Now determine the insets based off where this object is supposed to be positioned.
-    RenderBlock* cb = containingBlock();
-    RenderRegion* clampedContainingBlockRegion = cb->clampToStartAndEndRegions(region);
-    RenderBoxRegionInfo* containingBlockInfo = cb->renderBoxRegionInfo(clampedContainingBlockRegion);
-    LayoutUnit containingBlockLogicalWidth = cb->logicalWidth();
-    LayoutUnit containingBlockLogicalWidthInRegion = containingBlockInfo ? containingBlockInfo->logicalWidth() : containingBlockLogicalWidth;
-
-    LayoutUnit marginStartInRegion = computedValues.m_margins.m_start;
-    LayoutUnit startMarginDelta = marginStartInRegion - marginStart();
-    LayoutUnit logicalWidthInRegion = computedValues.m_extent;
-    LayoutUnit logicalLeftInRegion = computedValues.m_position;
-    LayoutUnit widthDelta = logicalWidthInRegion - logicalWidth();
-    LayoutUnit logicalLeftDelta = isOutOfFlowPositioned() ? logicalLeftInRegion - logicalLeft() : startMarginDelta;
-    LayoutUnit logicalRightInRegion = containingBlockLogicalWidthInRegion - (logicalLeftInRegion + logicalWidthInRegion);
-    LayoutUnit oldLogicalRight = containingBlockLogicalWidth - (logicalLeft() + logicalWidth());
-    LayoutUnit logicalRightDelta = isOutOfFlowPositioned() ? logicalRightInRegion - oldLogicalRight : startMarginDelta;
-
-    LayoutUnit logicalLeftOffset = 0;
-
-    if (!isOutOfFlowPositioned() && avoidsFloats() && cb->containsFloats()) {
-        LayoutUnit startPositionDelta = toRenderBlockFlow(cb)->computeStartPositionDeltaForChildAvoidingFloats(this, marginStartInRegion, region);
-        if (cb->style()->isLeftToRightDirection())
-            logicalLeftDelta += startPositionDelta;
-        else
-            logicalRightDelta += startPositionDelta;
-    }
-
-    if (cb->style()->isLeftToRightDirection())
-        logicalLeftOffset += logicalLeftDelta;
-    else
-        logicalLeftOffset -= (widthDelta + logicalRightDelta);
-
-    LayoutUnit logicalRightOffset = logicalWidth() - (logicalLeftOffset + logicalWidthInRegion);
-    bool isShifted = (containingBlockInfo && containingBlockInfo->isShifted())
-            || (style()->isLeftToRightDirection() && logicalLeftOffset)
-            || (!style()->isLeftToRightDirection() && logicalRightOffset);
-
-    // FIXME: Although it's unlikely, these boxes can go outside our bounds, and so we will need to incorporate them into overflow.
-    if (cacheFlag == CacheRenderBoxRegionInfo)
-        return region->setRenderBoxRegionInfo(this, logicalLeftOffset, logicalWidthInRegion, isShifted);
-    return new RenderBoxRegionInfo(logicalLeftOffset, logicalWidthInRegion, isShifted);
-}
-
 static bool shouldFlipBeforeAfterMargins(const RenderStyle* containingBlockStyle, const RenderStyle* childStyle)
 {
     ASSERT(containingBlockStyle->isHorizontalWritingMode() != childStyle->isHorizontalWritingMode());
     WritingMode childWritingMode = childStyle->writingMode();
     bool shouldFlip = false;
     switch (containingBlockStyle->writingMode()) {
     case TopToBottomWritingMode:
         shouldFlip = (childWritingMode == RightToLeftWritingMode);
         break;
     case BottomToTopWritingMode:
@@ skipping 429 matching lines @@
 
     // We need to stop here, since we don't want to increase the height of the table
     // artificially.  We're going to rely on this cell getting expanded to some new
     // height, and then when we lay out again we'll use the calculation below.
     if (isTableCell() && (h.isAuto() || h.isPercent())) {
         if (hasOverrideHeight())
             return overrideLogicalContentHeight();
         return logicalHeight() - borderAndPaddingLogicalHeight();
     }
 
-    if (h.isPercent() && isOutOfFlowPositioned() && !isRenderFlowThread()) {
+    if (h.isPercent() && isOutOfFlowPositioned()) {
         // FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
         LayoutUnit availableHeight = containingBlockLogicalHeightForPositioned(containingBlock());
         return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(h, availableHeight));
     }
 
     LayoutUnit heightIncludingScrollbar = computeContentAndScrollbarLogicalHeightUsing(h, -1);
     if (heightIncludingScrollbar != -1)
         return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar) - scrollbarLogicalHeight());
 
     // FIXME: Check logicalTop/logicalBottom here to correctly handle vertical writing-mode.
@@ skipping 35 matching lines @@
 
 void RenderBox::computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock)
 {
     LayoutUnit marginBefore;
     LayoutUnit marginAfter;
     computeBlockDirectionMargins(containingBlock, marginBefore, marginAfter);
     containingBlock->setMarginBeforeForChild(this, marginBefore);
     containingBlock->setMarginAfterForChild(this, marginAfter);
 }
 
-LayoutUnit RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, RenderRegion* region, bool checkForPerpendicularWritingMode) const
+LayoutUnit RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode) const
 {
     if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
         return containingBlockLogicalHeightForPositioned(containingBlock, false);
 
     // Use viewport as container for top-level fixed-position elements.
     if (style()->position() == FixedPosition && containingBlock->isRenderView()) {
         const RenderView* view = toRenderView(containingBlock);
         if (FrameView* frameView = view->frameView()) {
             LayoutRect viewportRect = frameView->viewportConstrainedVisibleContentRect();
             return containingBlock->isHorizontalWritingMode() ? viewportRect.width() : viewportRect.height();
         }
     }
 
-    if (containingBlock->isBox()) {
-        RenderFlowThread* flowThread = flowThreadContainingBlock();
-        if (!flowThread)
-            return toRenderBox(containingBlock)->clientLogicalWidth();
-
-        const RenderBlock* cb = toRenderBlock(containingBlock);
-        RenderBoxRegionInfo* boxInfo = 0;
-        if (!region) {
-            if (containingBlock->isRenderFlowThread() && !checkForPerpendicularWritingMode)
-                return toRenderFlowThread(containingBlock)->contentLogicalWidthOfFirstRegion();
-            if (isWritingModeRoot()) {
-                LayoutUnit cbPageOffset = cb->offsetFromLogicalTopOfFirstPage();
-                RenderRegion* cbRegion = cb->regionAtBlockOffset(cbPageOffset);
-                if (cbRegion) {
-                    cbRegion = cb->clampToStartAndEndRegions(cbRegion);
-                    boxInfo = cb->renderBoxRegionInfo(cbRegion);
-                }
-            }
-        } else if (region && flowThread->isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode()) {
-            RenderRegion* containingBlockRegion = cb->clampToStartAndEndRegions(region);
-            boxInfo = cb->renderBoxRegionInfo(containingBlockRegion);
-        }
-        return (boxInfo) ? max<LayoutUnit>(0, cb->clientLogicalWidth() - (cb->logicalWidth() - boxInfo->logicalWidth())) : cb->clientLogicalWidth();
-    }
+    if (containingBlock->isBox())
+        return toRenderBox(containingBlock)->clientLogicalWidth();
 
     ASSERT(containingBlock->isRenderInline() && containingBlock->isInFlowPositioned());
 
     const RenderInline* flow = toRenderInline(containingBlock);
     InlineFlowBox* first = flow->firstLineBox();
     InlineFlowBox* last = flow->lastLineBox();
 
     // If the containing block is empty, return a width of 0.
     if (!first || !last)
         return 0;
 
     LayoutUnit fromLeft;
     LayoutUnit fromRight;
     if (containingBlock->style()->isLeftToRightDirection()) {
         fromLeft = first->logicalLeft() + first->borderLogicalLeft();
         fromRight = last->logicalLeft() + last->logicalWidth() - last->borderLogicalRight();
     } else {
         fromRight = first->logicalLeft() + first->logicalWidth() - first->borderLogicalRight();
         fromLeft = last->logicalLeft() + last->borderLogicalLeft();
     }
 
     return max<LayoutUnit>(0, fromRight - fromLeft);
 }
 
 LayoutUnit RenderBox::containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode) const
 {
     if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
-        return containingBlockLogicalWidthForPositioned(containingBlock, 0, false);
+        return containingBlockLogicalWidthForPositioned(containingBlock, false);
 
     // Use viewport as container for top-level fixed-position elements.
     if (style()->position() == FixedPosition && containingBlock->isRenderView()) {
         const RenderView* view = toRenderView(containingBlock);
         if (FrameView* frameView = view->frameView()) {
             LayoutRect viewportRect = frameView->viewportConstrainedVisibleContentRect();
             return containingBlock->isHorizontalWritingMode() ? viewportRect.height() : viewportRect.width();
         }
     }
 
     if (containingBlock->isBox()) {
         const RenderBlock* cb = toRenderBlock(containingBlock);
         LayoutUnit result = cb->clientLogicalHeight();
-        RenderFlowThread* flowThread = flowThreadContainingBlock();
-        if (flowThread && containingBlock->isRenderFlowThread() && flowThread->isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode())
-            return toRenderFlowThread(containingBlock)->contentLogicalHeightOfFirstRegion();
         return result;
     }
 
     ASSERT(containingBlock->isRenderInline() && containingBlock->isInFlowPositioned());
 
     const RenderInline* flow = toRenderInline(containingBlock);
     InlineFlowBox* first = flow->firstLineBox();
     InlineFlowBox* last = flow->lastLineBox();
 
     // If the containing block is empty, return a height of 0.
     if (!first || !last)
         return 0;
 
     LayoutUnit heightResult;
     LayoutRect boundingBox = flow->linesBoundingBox();
     if (containingBlock->isHorizontalWritingMode())
         heightResult = boundingBox.height();
     else
         heightResult = boundingBox.width();
     heightResult -= (containingBlock->borderBefore() + containingBlock->borderAfter());
     return heightResult;
 }
 
-static void computeInlineStaticDistance(Length& logicalLeft, Length& logicalRight, const RenderBox* child, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth, RenderRegion* region)
+static void computeInlineStaticDistance(Length& logicalLeft, Length& logicalRight, const RenderBox* child, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth)
 {
     if (!logicalLeft.isAuto() || !logicalRight.isAuto())
         return;
 
     // FIXME: The static distance computation has not been patched for mixed writing modes yet.
     if (child->parent()->style()->direction() == LTR) {
         LayoutUnit staticPosition = child->layer()->staticInlinePosition() - containerBlock->borderLogicalLeft();
         for (RenderObject* curr = child->parent(); curr && curr != containerBlock; curr = curr->container()) {
             if (curr->isBox()) {
                 staticPosition += toRenderBox(curr)->logicalLeft();
                 if (toRenderBox(curr)->isRelPositioned())
                     staticPosition += toRenderBox(curr)->relativePositionOffset().width();
-                if (region && curr->isRenderBlock()) {
-                    const RenderBlock* cb = toRenderBlock(curr);
-                    region = cb->clampToStartAndEndRegions(region);
-                    RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(region);
-                    if (boxInfo)
-                        staticPosition += boxInfo->logicalLeft();
-                }
             } else if (curr->isInline()) {
                 if (curr->isRelPositioned()) {
                     if (!curr->style()->logicalLeft().isAuto())
                         staticPosition += curr->style()->logicalLeft().value();
                     else
                         staticPosition -= curr->style()->logicalRight().value();
                 }
             }
         }
         logicalLeft.setValue(Fixed, staticPosition);
     } else {
         RenderBox* enclosingBox = child->parent()->enclosingBox();
         LayoutUnit staticPosition = child->layer()->staticInlinePosition() + containerLogicalWidth + containerBlock->borderLogicalLeft();
         for (RenderObject* curr = child->parent(); curr; curr = curr->container()) {
             if (curr->isBox()) {
                 if (curr != containerBlock) {
                     staticPosition -= toRenderBox(curr)->logicalLeft();
                     if (toRenderBox(curr)->isRelPositioned())
                         staticPosition -= toRenderBox(curr)->relativePositionOffset().width();
                 }
                 if (curr == enclosingBox)
                     staticPosition -= enclosingBox->logicalWidth();
-                if (region && curr->isRenderBlock()) {
-                    const RenderBlock* cb = toRenderBlock(curr);
-                    region = cb->clampToStartAndEndRegions(region);
-                    RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(region);
-                    if (boxInfo) {
-                        if (curr != containerBlock)
-                            staticPosition -= cb->logicalWidth() - (boxInfo->logicalLeft() + boxInfo->logicalWidth());
-                        if (curr == enclosingBox)
-                            staticPosition += enclosingBox->logicalWidth() - boxInfo->logicalWidth();
-                    }
-                }
             } else if (curr->isInline()) {
                 if (curr->isRelPositioned()) {
                     if (!curr->style()->logicalLeft().isAuto())
                         staticPosition -= curr->style()->logicalLeft().value();
                     else
                         staticPosition += curr->style()->logicalRight().value();
                 }
             }
             if (curr == containerBlock)
                 break;
         }
         logicalRight.setValue(Fixed, staticPosition);
     }
 }
 
-void RenderBox::computePositionedLogicalWidth(LogicalExtentComputedValues& computedValues, RenderRegion* region) const
+void RenderBox::computePositionedLogicalWidth(LogicalExtentComputedValues& computedValues) const
 {
     if (isReplaced()) {
         // FIXME: Positioned replaced elements inside a flow thread are not working properly
         // with variable width regions (see https://bugs.webkit.org/show_bug.cgi?id=69896 ).
         computePositionedLogicalWidthReplaced(computedValues);
         return;
     }
 
     // QUESTIONS
     // FIXME 1: Should we still deal with these the cases of 'left' or 'right' having
     // the type 'static' in determining whether to calculate the static distance?
     // NOTE: 'static' is not a legal value for 'left' or 'right' as of CSS 2.1.
 
     // FIXME 2: Can perhaps optimize out cases when max-width/min-width are greater
     // than or less than the computed width().  Be careful of box-sizing and
     // percentage issues.
 
     // The following is based off of the W3C Working Draft from April 11, 2006 of
     // CSS 2.1: Section 10.3.7 "Absolutely positioned, non-replaced elements"
     // <http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width>
     // (block-style-comments in this function and in computePositionedLogicalWidthUsing()
     // correspond to text from the spec)
 
 
     // We don't use containingBlock(), since we may be positioned by an enclosing
     // relative positioned inline.
     const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
 
-    const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, region);
+    const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
 
     // Use the container block's direction except when calculating the static distance
     // This conforms with the reference results for abspos-replaced-width-margin-000.htm
     // of the CSS 2.1 test suite
     TextDirection containerDirection = containerBlock->style()->direction();
 
     bool isHorizontal = isHorizontalWritingMode();
     const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
     const Length marginLogicalLeft = isHorizontal ? style()->marginLeft() : style()->marginTop();
     const Length marginLogicalRight = isHorizontal ? style()->marginRight() : style()->marginBottom();
@@ skipping 20 matching lines @@
      * user agents are free to make a guess at its probable position.
      *
      * For the purposes of calculating the static position, the containing block of
      * fixed positioned elements is the initial containing block instead of the
      * viewport, and all scrollable boxes should be assumed to be scrolled to their
      * origin.
     \*---------------------------------------------------------------------------*/
 
     // see FIXME 1
     // Calculate the static distance if needed.
-    computeInlineStaticDistance(logicalLeftLength, logicalRightLength, this, containerBlock, containerLogicalWidth, region);
+    computeInlineStaticDistance(logicalLeftLength, logicalRightLength, this, containerBlock, containerLogicalWidth);
 
     // Calculate constraint equation values for 'width' case.
     computePositionedLogicalWidthUsing(style()->logicalWidth(), containerBlock, containerDirection,
                                        containerLogicalWidth, bordersPlusPadding,
                                        logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
                                        computedValues);
 
     // Calculate constraint equation values for 'max-width' case.
     if (!style()->logicalMaxWidth().isUndefined()) {
         LogicalExtentComputedValues maxValues;
@@ skipping 22 matching lines @@
 
         if (computedValues.m_extent < minValues.m_extent) {
             computedValues.m_extent = minValues.m_extent;
             computedValues.m_position = minValues.m_position;
             computedValues.m_margins.m_start = minValues.m_margins.m_start;
             computedValues.m_margins.m_end = minValues.m_margins.m_end;
         }
     }
 
     computedValues.m_extent += bordersPlusPadding;
-
-    // Adjust logicalLeft if we need to for the flipped version of our writing mode in regions.
-    // FIXME: Add support for other types of objects as containerBlock, not only RenderBlock.
-    RenderFlowThread* flowThread = flowThreadContainingBlock();
-    if (flowThread && !region && isWritingModeRoot() && isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode() && containerBlock->isRenderBlock()) {
-        ASSERT(containerBlock->canHaveBoxInfoInRegion());
-        LayoutUnit logicalLeftPos = computedValues.m_position;
-        const RenderBlock* cb = toRenderBlock(containerBlock);
-        LayoutUnit cbPageOffset = cb->offsetFromLogicalTopOfFirstPage();
-        RenderRegion* cbRegion = cb->regionAtBlockOffset(cbPageOffset);
-        if (cbRegion) {
-            cbRegion = cb->clampToStartAndEndRegions(cbRegion);
-            RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(cbRegion);
-            if (boxInfo) {
-                logicalLeftPos += boxInfo->logicalLeft();
-                computedValues.m_position = logicalLeftPos;
-            }
-        }
-    }
 }
 
 static void computeLogicalLeftPositionedOffset(LayoutUnit& logicalLeftPos, const RenderBox* child, LayoutUnit logicalWidthValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth)
 {
     // Deal with differing writing modes here.  Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
     // along this axis, then we need to flip the coordinate.  This can only happen if the containing block is both a flipped mode and perpendicular to us.
     if (containerBlock->isHorizontalWritingMode() != child->isHorizontalWritingMode() && containerBlock->style()->isFlippedBlocksWritingMode()) {
         logicalLeftPos = containerLogicalWidth - logicalWidthValue - logicalLeftPos;
         logicalLeftPos += (child->isHorizontalWritingMode() ? containerBlock->borderRight() : containerBlock->borderBottom());
     } else
@@ skipping 16 matching lines @@
 {
     if (logicalWidth.isIntrinsic())
         logicalWidth = Length(computeIntrinsicLogicalWidthUsing(logicalWidth, containerLogicalWidth, bordersPlusPadding) - bordersPlusPadding, Fixed);
 
     // 'left' and 'right' cannot both be 'auto' because one would of been
     // converted to the static position already
     ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
 
     LayoutUnit logicalLeftValue = 0;
 
-    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
+    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, false);
 
     bool logicalWidthIsAuto = logicalWidth.isIntrinsicOrAuto();
     bool logicalLeftIsAuto = logicalLeft.isAuto();
     bool logicalRightIsAuto = logicalRight.isAuto();
     LayoutUnit& marginLogicalLeftValue = style()->isLeftToRightDirection() ? computedValues.m_margins.m_start : computedValues.m_margins.m_end;
     LayoutUnit& marginLogicalRightValue = style()->isLeftToRightDirection() ? computedValues.m_margins.m_end : computedValues.m_margins.m_start;
     if (!logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
         /*-----------------------------------------------------------------------*\
          * If none of the three is 'auto': If both 'margin-left' and 'margin-
          * right' are 'auto', solve the equation under the extra constraint that
@@ skipping 253 matching lines @@
         if (computedValues.m_extent < minValues.m_extent) {
             computedValues.m_extent = minValues.m_extent;
             computedValues.m_position = minValues.m_position;
             computedValues.m_margins.m_before = minValues.m_margins.m_before;
             computedValues.m_margins.m_after = minValues.m_margins.m_after;
         }
     }
 
     // Set final height value.
     computedValues.m_extent += bordersPlusPadding;
-
-    // Adjust logicalTop if we need to for perpendicular writing modes in regions.
-    // FIXME: Add support for other types of objects as containerBlock, not only RenderBlock.
-    RenderFlowThread* flowThread = flowThreadContainingBlock();
-    if (flowThread && isHorizontalWritingMode() != containerBlock->isHorizontalWritingMode() && containerBlock->isRenderBlock()) {
-        ASSERT(containerBlock->canHaveBoxInfoInRegion());
-        LayoutUnit logicalTopPos = computedValues.m_position;
-        const RenderBlock* cb = toRenderBlock(containerBlock);
-        LayoutUnit cbPageOffset = cb->offsetFromLogicalTopOfFirstPage() - logicalLeft();
-        RenderRegion* cbRegion = cb->regionAtBlockOffset(cbPageOffset);
-        if (cbRegion) {
-            cbRegion = cb->clampToStartAndEndRegions(cbRegion);
-            RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(cbRegion);
-            if (boxInfo) {
-                logicalTopPos += boxInfo->logicalLeft();
-                computedValues.m_position = logicalTopPos;
-            }
-        }
-    }
 }
 
 static void computeLogicalTopPositionedOffset(LayoutUnit& logicalTopPos, const RenderBox* child, LayoutUnit logicalHeightValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalHeight)
 {
     // Deal with differing writing modes here.  Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
     // along this axis, then we need to flip the coordinate.  This can only happen if the containing block is both a flipped mode and perpendicular to us.
     if ((child->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() != containerBlock->isHorizontalWritingMode())
         || (child->style()->isFlippedBlocksWritingMode() != containerBlock->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode()))
         logicalTopPos = containerLogicalHeight - logicalHeightValue - logicalTopPos;
 
@@ skipping 16 matching lines @@
                                                     Length logicalTop, Length logicalBottom, Length marginBefore, Length marginAfter,
                                                     LogicalExtentComputedValues& computedValues) const
 {
     // 'top' and 'bottom' cannot both be 'auto' because 'top would of been
     // converted to the static position in computePositionedLogicalHeight()
     ASSERT(!(logicalTop.isAuto() && logicalBottom.isAuto()));
 
     LayoutUnit logicalHeightValue;
     LayoutUnit contentLogicalHeight = logicalHeight - bordersPlusPadding;
 
-    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
+    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, false);
 
     LayoutUnit logicalTopValue = 0;
 
     bool logicalHeightIsAuto = logicalHeightLength.isAuto();
     bool logicalTopIsAuto = logicalTop.isAuto();
     bool logicalBottomIsAuto = logicalBottom.isAuto();
 
     LayoutUnit resolvedLogicalHeight;
     // Height is never unsolved for tables.
     if (isTable()) {
@@ skipping 110 matching lines @@
     // CSS 2.1: Section 10.3.8 "Absolutely positioned, replaced elements"
     // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-width>
     // (block-style-comments in this function correspond to text from the spec and
     // the numbers correspond to numbers in spec)
 
     // We don't use containingBlock(), since we may be positioned by an enclosing
     // relative positioned inline.
     const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
 
     const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
-    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
+    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, false);
 
     // To match WinIE, in quirks mode use the parent's 'direction' property
     // instead of the the container block's.
     TextDirection containerDirection = containerBlock->style()->direction();
 
     // Variables to solve.
     bool isHorizontal = isHorizontalWritingMode();
     Length logicalLeft = style()->logicalLeft();
     Length logicalRight = style()->logicalRight();
     Length marginLogicalLeft = isHorizontal ? style()->marginLeft() : style()->marginTop();
@@ skipping 11 matching lines @@
     computedValues.m_extent = computeReplacedLogicalWidth() + borderAndPaddingLogicalWidth();
 
     const LayoutUnit availableSpace = containerLogicalWidth - computedValues.m_extent;
 
     /*-----------------------------------------------------------------------*\
      * 2. If both 'left' and 'right' have the value 'auto', then if 'direction'
      *    of the containing block is 'ltr', set 'left' to the static position;
      *    else if 'direction' is 'rtl', set 'right' to the static position.
     \*-----------------------------------------------------------------------*/
     // see FIXME 1
-    computeInlineStaticDistance(logicalLeft, logicalRight, this, containerBlock, containerLogicalWidth, 0); // FIXME: Pass the region.
+    computeInlineStaticDistance(logicalLeft, logicalRight, this, containerBlock, containerLogicalWidth);
 
     /*-----------------------------------------------------------------------*\
      * 3. If 'left' or 'right' are 'auto', replace any 'auto' on 'margin-left'
      *    or 'margin-right' with '0'.
     \*-----------------------------------------------------------------------*/
     if (logicalLeft.isAuto() || logicalRight.isAuto()) {
         if (marginLogicalLeft.isAuto())
             marginLogicalLeft.setValue(Fixed, 0);
         if (marginLogicalRight.isAuto())
             marginLogicalRight.setValue(Fixed, 0);
@@ skipping 115 matching lines @@
     // The following is based off of the W3C Working Draft from April 11, 2006 of
     // CSS 2.1: Section 10.6.5 "Absolutely positioned, replaced elements"
     // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-height>
     // (block-style-comments in this function correspond to text from the spec and
     // the numbers correspond to numbers in spec)
 
     // We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
     const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
 
     const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
-    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, 0, false);
+    const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, false);
 
     // Variables to solve.
     Length marginBefore = style()->marginBefore();
     Length marginAfter = style()->marginAfter();
     LayoutUnit& marginBeforeAlias = computedValues.m_margins.m_before;
     LayoutUnit& marginAfterAlias = computedValues.m_margins.m_after;
 
     Length logicalTop = style()->logicalTop();
     Length logicalBottom = style()->logicalBottom();
 
@@ skipping 294 matching lines @@
         overflowMaxY = max(overflowMaxY, borderBox.maxY() + ((!isFlipped || !isHorizontal) ? borderOutsets.bottom() : borderOutsets.top()));
     }
 
     // Add in the final overflow with shadows and outsets combined.
     LayoutRect visualEffectOverflow(overflowMinX, overflowMinY, overflowMaxX - overflowMinX, overflowMaxY - overflowMinY);
     addVisualOverflow(visualEffectOverflow);
 }
 
 void RenderBox::addOverflowFromChild(RenderBox* child, const LayoutSize& delta)
 {
-    // Never allow flow threads to propagate overflow up to a parent.
-    if (child->isRenderFlowThread())
-        return;
-
     // Only propagate layout overflow from the child if the child isn't clipping its overflow.  If it is, then
     // its overflow is internal to it, and we don't care about it.  layoutOverflowRectForPropagation takes care of this
     // and just propagates the border box rect instead.
     LayoutRect childLayoutOverflowRect = child->layoutOverflowRectForPropagation(style());
     childLayoutOverflowRect.move(delta);
     addLayoutOverflow(childLayoutOverflowRect);
 
     // Add in visual overflow from the child.  Even if the child clips its overflow, it may still
     // have visual overflow of its own set from box shadows or reflections.  It is unnecessary to propagate this
     // overflow if we are clipping our own overflow.
@@ skipping 468 matching lines @@
     ASSERT(beforeChild->parent() == this);
     return beforeChild;
 }
 
 LayoutUnit RenderBox::offsetFromLogicalTopOfFirstPage() const
 {
     LayoutState* layoutState = view()->layoutState();
     if (layoutState && !layoutState->isPaginated())
         return 0;
 
-    if (!layoutState && !flowThreadContainingBlock())
+    if (!layoutState)
         return 0;
 
     RenderBlock* containerBlock = containingBlock();
     return containerBlock->offsetFromLogicalTopOfFirstPage() + logicalTop();
 }
 
 } // namespace WebCore