Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 2244 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/RenderBlockLineLayout.cpp b/Source/WebCore/rendering/RenderBlockLineLayout.cpp
new file mode 100644
index 0000000..1d909a3
--- /dev/null
+++ b/Source/WebCore/rendering/RenderBlockLineLayout.cpp
@@ -0,0 +1,2244 @@
+/*
+ * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010 Apple Inc. All right reserved.
+ * Copyright (C) 2010 Google Inc. 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
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+
+#include "BidiResolver.h"
+#include "CharacterNames.h"
+#include "Hyphenation.h"
+#include "InlineIterator.h"
+#include "InlineTextBox.h"
+#include "Logging.h"
+#include "RenderArena.h"
+#include "RenderInline.h"
+#include "RenderLayer.h"
+#include "RenderListMarker.h"
+#include "RenderView.h"
+#include "Settings.h"
+#include "TrailingFloatsRootInlineBox.h"
+#include "VerticalPositionCache.h"
+#include "break_lines.h"
+#include <wtf/AlwaysInline.h>
+#include <wtf/RefCountedLeakCounter.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/Vector.h>
+#ifdef ANDROID_LAYOUT
+#include "Frame.h"
+#include "FrameTree.h"
+#include "Settings.h"
+#include "Text.h"
+#include "HTMLNames.h"
+#endif // ANDROID_LAYOUT
+
+#if ENABLE(SVG)
+#include "RenderSVGInlineText.h"
+#include "SVGRootInlineBox.h"
+#endif
+
+using namespace std;
+using namespace WTF;
+using namespace Unicode;
+
+namespace WebCore {
+
+// We don't let our line box tree for a single line get any deeper than this.
+const unsigned cMaxLineDepth = 200;
+
+static int getBorderPaddingMargin(RenderBoxModelObject* child, bool endOfInline)
+{
+    if (endOfInline)
+        return child->marginEnd() + child->paddingEnd() + child->borderEnd();
+    return child->marginStart() + child->paddingStart() + child->borderStart();
+}
+
+static int inlineLogicalWidth(RenderObject* child, bool start = true, bool end = true)
+{
+    unsigned lineDepth = 1;
+    int extraWidth = 0;
+    RenderObject* parent = child->parent();
+    while (parent->isInline() && !parent->isInlineBlockOrInlineTable() && lineDepth++ < cMaxLineDepth) {
+        if (start && !child->previousSibling())
+            extraWidth += getBorderPaddingMargin(toRenderBoxModelObject(parent), false);
+        if (end && !child->nextSibling())
+            extraWidth += getBorderPaddingMargin(toRenderBoxModelObject(parent), true);
+        child = parent;
+        parent = child->parent();
+    }
+    return extraWidth;
+}
+
+static void checkMidpoints(LineMidpointState& lineMidpointState, InlineIterator& lBreak)
+{
+    // Check to see if our last midpoint is a start point beyond the line break.  If so,
+    // shave it off the list, and shave off a trailing space if the previous end point doesn't
+    // preserve whitespace.
+    if (lBreak.obj && lineMidpointState.numMidpoints && !(lineMidpointState.numMidpoints % 2)) {
+        InlineIterator* midpoints = lineMidpointState.midpoints.data();
+        InlineIterator& endpoint = midpoints[lineMidpointState.numMidpoints - 2];
+        const InlineIterator& startpoint = midpoints[lineMidpointState.numMidpoints - 1];
+        InlineIterator currpoint = endpoint;
+        while (!currpoint.atEnd() && currpoint != startpoint && currpoint != lBreak)
+            currpoint.increment();
+        if (currpoint == lBreak) {
+            // We hit the line break before the start point.  Shave off the start point.
+            lineMidpointState.numMidpoints--;
+            if (endpoint.obj->style()->collapseWhiteSpace())
+                endpoint.pos--;
+        }
+    }    
+}
+
+static void addMidpoint(LineMidpointState& lineMidpointState, const InlineIterator& midpoint)
+{
+    if (lineMidpointState.midpoints.size() <= lineMidpointState.numMidpoints)
+        lineMidpointState.midpoints.grow(lineMidpointState.numMidpoints + 10);
+
+    InlineIterator* midpoints = lineMidpointState.midpoints.data();
+    midpoints[lineMidpointState.numMidpoints++] = midpoint;
+}
+
+void RenderBlock::appendRunsForObject(int start, int end, RenderObject* obj, InlineBidiResolver& resolver)
+{
+    if (start > end || obj->isFloating() ||
+        (obj->isPositioned() && !obj->style()->hasStaticX() && !obj->style()->hasStaticY() && !obj->container()->isRenderInline()))
+        return;
+
+    LineMidpointState& lineMidpointState = resolver.midpointState();
+    bool haveNextMidpoint = (lineMidpointState.currentMidpoint < lineMidpointState.numMidpoints);
+    InlineIterator nextMidpoint;
+    if (haveNextMidpoint)
+        nextMidpoint = lineMidpointState.midpoints[lineMidpointState.currentMidpoint];
+    if (lineMidpointState.betweenMidpoints) {
+        if (!(haveNextMidpoint && nextMidpoint.obj == obj))
+            return;
+        // This is a new start point. Stop ignoring objects and 
+        // adjust our start.
+        lineMidpointState.betweenMidpoints = false;
+        start = nextMidpoint.pos;
+        lineMidpointState.currentMidpoint++;
+        if (start < end)
+            return appendRunsForObject(start, end, obj, resolver);
+    } else {
+        if (!haveNextMidpoint || (obj != nextMidpoint.obj)) {
+            resolver.addRun(new (obj->renderArena()) BidiRun(start, end, obj, resolver.context(), resolver.dir()));
+            return;
+        }
+
+        // An end midpoint has been encountered within our object.  We
+        // need to go ahead and append a run with our endpoint.
+        if (static_cast<int>(nextMidpoint.pos + 1) <= end) {
+            lineMidpointState.betweenMidpoints = true;
+            lineMidpointState.currentMidpoint++;
+            if (nextMidpoint.pos != UINT_MAX) { // UINT_MAX means stop at the object and don't include any of it.
+                if (static_cast<int>(nextMidpoint.pos + 1) > start)
+                    resolver.addRun(new (obj->renderArena())
+                        BidiRun(start, nextMidpoint.pos + 1, obj, resolver.context(), resolver.dir()));
+                return appendRunsForObject(nextMidpoint.pos + 1, end, obj, resolver);
+            }
+        } else
+           resolver.addRun(new (obj->renderArena()) BidiRun(start, end, obj, resolver.context(), resolver.dir()));
+    }
+}
+
+static inline InlineBox* createInlineBoxForRenderer(RenderObject* obj, bool isRootLineBox, bool isOnlyRun = false)
+{
+    if (isRootLineBox)
+        return toRenderBlock(obj)->createAndAppendRootInlineBox();
+    
+    if (obj->isText()) {
+        InlineTextBox* textBox = toRenderText(obj)->createInlineTextBox();
+        // We only treat a box as text for a <br> if we are on a line by ourself or in strict mode
+        // (Note the use of strict mode.  In "almost strict" mode, we don't treat the box for <br> as text.)
+        if (obj->isBR())
+            textBox->setIsText(isOnlyRun || obj->document()->inNoQuirksMode());
+        return textBox;
+    }
+    
+    if (obj->isBox())
+        return toRenderBox(obj)->createInlineBox();
+    
+    return toRenderInline(obj)->createAndAppendInlineFlowBox();
+}
+
+static inline void dirtyLineBoxesForRenderer(RenderObject* o, bool fullLayout)
+{
+    if (o->isText()) {
+        if (o->preferredLogicalWidthsDirty() && o->isCounter())
+            toRenderText(o)->computePreferredLogicalWidths(0); // FIXME: Counters depend on this hack. No clue why. Should be investigated and removed.
+        toRenderText(o)->dirtyLineBoxes(fullLayout);
+    } else
+        toRenderInline(o)->dirtyLineBoxes(fullLayout);
+}
+
+InlineFlowBox* RenderBlock::createLineBoxes(RenderObject* obj, bool firstLine)
+{
+    // See if we have an unconstructed line box for this object that is also
+    // the last item on the line.
+    unsigned lineDepth = 1;
+    InlineFlowBox* childBox = 0;
+    InlineFlowBox* parentBox = 0;
+    InlineFlowBox* result = 0;
+    do {
+        ASSERT(obj->isRenderInline() || obj == this);
+        
+        // Get the last box we made for this render object.
+        parentBox = obj->isRenderInline() ? toRenderInline(obj)->lastLineBox() : toRenderBlock(obj)->lastLineBox();
+
+        // If this box is constructed then it is from a previous line, and we need
+        // to make a new box for our line.  If this box is unconstructed but it has
+        // something following it on the line, then we know we have to make a new box
+        // as well.  In this situation our inline has actually been split in two on
+        // the same line (this can happen with very fancy language mixtures).
+        bool constructedNewBox = false;
+        if (!parentBox || parentBox->isConstructed() || parentBox->nextOnLine()) {
+            // We need to make a new box for this render object.  Once
+            // made, we need to place it at the end of the current line.
+            InlineBox* newBox = createInlineBoxForRenderer(obj, obj == this);
+            ASSERT(newBox->isInlineFlowBox());
+            parentBox = static_cast<InlineFlowBox*>(newBox);
+            parentBox->setFirstLineStyleBit(firstLine);
+            parentBox->setIsHorizontal(style()->isHorizontalWritingMode());
+            constructedNewBox = true;
+        }
+
+        if (!result)
+            result = parentBox;
+
+        // If we have hit the block itself, then |box| represents the root
+        // inline box for the line, and it doesn't have to be appended to any parent
+        // inline.
+        if (childBox)
+            parentBox->addToLine(childBox);
+
+        if (!constructedNewBox || obj == this)
+            break;
+
+        childBox = parentBox;        
+
+        // If we've exceeded our line depth, then jump straight to the root and skip all the remaining
+        // intermediate inline flows.
+        obj = (++lineDepth >= cMaxLineDepth) ? this : obj->parent();
+
+    } while (true);
+
+    return result;
+}
+
+RootInlineBox* RenderBlock::constructLine(unsigned runCount, BidiRun* firstRun, BidiRun* lastRun, bool firstLine, bool lastLine, RenderObject* endObject)
+{
+    ASSERT(firstRun);
+
+    bool rootHasSelectedChildren = false;
+    InlineFlowBox* parentBox = 0;
+    for (BidiRun* r = firstRun; r; r = r->next()) {
+        // Create a box for our object.
+        bool isOnlyRun = (runCount == 1);
+        if (runCount == 2 && !r->m_object->isListMarker())
+            isOnlyRun = (!style()->isLeftToRightDirection() ? lastRun : firstRun)->m_object->isListMarker();
+
+        InlineBox* box = createInlineBoxForRenderer(r->m_object, false, isOnlyRun);
+        r->m_box = box;
+
+        ASSERT(box);
+        if (!box)
+            continue;
+
+        if (!rootHasSelectedChildren && box->renderer()->selectionState() != RenderObject::SelectionNone)
+            rootHasSelectedChildren = true;
+
+        // If we have no parent box yet, or if the run is not simply a sibling,
+        // then we need to construct inline boxes as necessary to properly enclose the
+        // run's inline box.
+        if (!parentBox || parentBox->renderer() != r->m_object->parent())
+            // Create new inline boxes all the way back to the appropriate insertion point.
+            parentBox = createLineBoxes(r->m_object->parent(), firstLine);
+
+        // Append the inline box to this line.
+        parentBox->addToLine(box);
+
+        bool visuallyOrdered = r->m_object->style()->visuallyOrdered();
+        box->setBidiLevel(visuallyOrdered ? 0 : r->level());
+
+        if (box->isInlineTextBox()) {
+            InlineTextBox* text = static_cast<InlineTextBox*>(box);
+            text->setStart(r->m_start);
+            text->setLen(r->m_stop - r->m_start);
+            text->m_dirOverride = r->dirOverride(visuallyOrdered);
+            if (r->m_hasHyphen)
+                text->setHasHyphen(true);
+        }
+    }
+
+    // We should have a root inline box.  It should be unconstructed and
+    // be the last continuation of our line list.
+    ASSERT(lastLineBox() && !lastLineBox()->isConstructed());
+
+    // Set the m_selectedChildren flag on the root inline box if one of the leaf inline box
+    // from the bidi runs walk above has a selection state.
+    if (rootHasSelectedChildren)
+        lastLineBox()->root()->setHasSelectedChildren(true);
+
+    // Set bits on our inline flow boxes that indicate which sides should
+    // paint borders/margins/padding.  This knowledge will ultimately be used when
+    // we determine the horizontal positions and widths of all the inline boxes on
+    // the line.
+    lastLineBox()->determineSpacingForFlowBoxes(lastLine, endObject);
+
+    // Now mark the line boxes as being constructed.
+    lastLineBox()->setConstructed();
+
+    // Return the last line.
+    return lastRootBox();
+}
+
+void RenderBlock::computeInlineDirectionPositionsForLine(RootInlineBox* lineBox, bool firstLine, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
+{
+    // First determine our total logical width.
+    int availableLogicalWidth = availableLogicalWidthForLine(logicalHeight(), firstLine);
+    int totalLogicalWidth = lineBox->getFlowSpacingLogicalWidth();
+    bool needsWordSpacing = false;
+    unsigned numSpaces = 0;
+    ETextAlign textAlign = style()->textAlign();
+
+    for (BidiRun* r = firstRun; r; r = r->next()) {
+        if (!r->m_box || r->m_object->isPositioned() || r->m_box->isLineBreak())
+            continue; // Positioned objects are only participating to figure out their
+                      // correct static x position.  They have no effect on the width.
+                      // Similarly, line break boxes have no effect on the width.
+        if (r->m_object->isText()) {
+            RenderText* rt = toRenderText(r->m_object);
+
+            if (textAlign == JUSTIFY && r != trailingSpaceRun) {
+                const UChar* characters = rt->characters();
+                for (int i = r->m_start; i < r->m_stop; i++) {
+                    UChar c = characters[i];
+                    if (c == ' ' || c == '\n' || c == '\t')
+                        numSpaces++;
+                }
+            }
+
+            if (int length = rt->textLength()) {
+                if (!r->m_start && needsWordSpacing && isSpaceOrNewline(rt->characters()[r->m_start]))
+                    totalLogicalWidth += rt->style(firstLine)->font().wordSpacing();
+                needsWordSpacing = !isSpaceOrNewline(rt->characters()[r->m_stop - 1]) && r->m_stop == length;          
+            }
+            HashSet<const SimpleFontData*> fallbackFonts;
+            GlyphOverflow glyphOverflow;
+            int hyphenWidth = 0;
+            if (static_cast<InlineTextBox*>(r->m_box)->hasHyphen()) {
+                const AtomicString& hyphenString = rt->style()->hyphenString();
+                hyphenWidth = rt->style(firstLine)->font().width(TextRun(hyphenString.characters(), hyphenString.length()));
+            }
+            r->m_box->setLogicalWidth(rt->width(r->m_start, r->m_stop - r->m_start, totalLogicalWidth, firstLine, &fallbackFonts, &glyphOverflow) + hyphenWidth);
+            if (!fallbackFonts.isEmpty()) {
+                ASSERT(r->m_box->isText());
+                GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.add(static_cast<InlineTextBox*>(r->m_box), make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).first;
+                ASSERT(it->second.first.isEmpty());
+                copyToVector(fallbackFonts, it->second.first);
+            }
+            if ((glyphOverflow.top || glyphOverflow.bottom || glyphOverflow.left || glyphOverflow.right)) {
+                ASSERT(r->m_box->isText());
+                GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.add(static_cast<InlineTextBox*>(r->m_box), make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).first;
+                it->second.second = glyphOverflow;
+            }
+        } else if (!r->m_object->isRenderInline()) {
+            RenderBox* renderBox = toRenderBox(r->m_object);
+            renderBox->computeLogicalWidth();
+            r->m_box->setLogicalWidth(logicalWidthForChild(renderBox));
+            totalLogicalWidth += marginStartForChild(renderBox) + marginEndForChild(renderBox);
+        }
+
+        totalLogicalWidth += r->m_box->logicalWidth();
+    }
+
+    // Armed with the total width of the line (without justification),
+    // we now examine our text-align property in order to determine where to position the
+    // objects horizontally.  The total width of the line can be increased if we end up
+    // justifying text.
+    int logicalLeft = logicalLeftOffsetForLine(logicalHeight(), firstLine);
+    switch (textAlign) {
+        case LEFT:
+        case WEBKIT_LEFT:
+            // The direction of the block should determine what happens with wide lines.  In
+            // particular with RTL blocks, wide lines should still spill out to the left.
+            if (style()->isLeftToRightDirection()) {
+                if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun)
+                    trailingSpaceRun->m_box->setLogicalWidth(max(0, trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
+            } else {
+                if (trailingSpaceRun)
+                    trailingSpaceRun->m_box->setLogicalWidth(0);
+                else if (totalLogicalWidth > availableLogicalWidth)
+                    logicalLeft -= (totalLogicalWidth - availableLogicalWidth);
+            }
+            break;
+        case JUSTIFY:
+            if (numSpaces && !reachedEnd && !lineBox->endsWithBreak()) {
+                if (trailingSpaceRun) {
+                    totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
+                    trailingSpaceRun->m_box->setLogicalWidth(0);
+                }
+                break;
+            }
+            // fall through
+        case TAAUTO:
+            numSpaces = 0;
+            // for right to left fall through to right aligned
+            if (style()->isLeftToRightDirection()) {
+                if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun)
+                    trailingSpaceRun->m_box->setLogicalWidth(max(0, trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
+                break;
+            }
+        case RIGHT:
+        case WEBKIT_RIGHT:
+            // Wide lines spill out of the block based off direction.
+            // So even if text-align is right, if direction is LTR, wide lines should overflow out of the right
+            // side of the block.
+            if (style()->isLeftToRightDirection()) {
+                if (trailingSpaceRun) {
+                    totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
+                    trailingSpaceRun->m_box->setLogicalWidth(0);
+                }
+                if (totalLogicalWidth < availableLogicalWidth)
+                    logicalLeft += availableLogicalWidth - totalLogicalWidth;
+            } else {
+                if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun) {
+                    trailingSpaceRun->m_box->setLogicalWidth(max(0, trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
+                    totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
+                } else
+                    logicalLeft += availableLogicalWidth - totalLogicalWidth;
+            }
+            break;
+        case CENTER:
+        case WEBKIT_CENTER:
+            int trailingSpaceWidth = 0;
+            if (trailingSpaceRun) {
+                totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
+                trailingSpaceWidth = min(trailingSpaceRun->m_box->logicalWidth(), (availableLogicalWidth - totalLogicalWidth + 1) / 2);
+                trailingSpaceRun->m_box->setLogicalWidth(max(0, trailingSpaceWidth));
+            }
+            if (style()->isLeftToRightDirection())
+                logicalLeft += max((availableLogicalWidth - totalLogicalWidth) / 2, 0);
+            else
+                logicalLeft += totalLogicalWidth > availableLogicalWidth ? (availableLogicalWidth - totalLogicalWidth) : (availableLogicalWidth - totalLogicalWidth) / 2 - trailingSpaceWidth;
+            break;
+    }
+
+    if (numSpaces) {
+        for (BidiRun* r = firstRun; r; r = r->next()) {
+            if (!r->m_box || r == trailingSpaceRun)
+                continue;
+
+            int spaceAdd = 0;
+            if (r->m_object->isText()) {
+                unsigned spaces = 0;
+                const UChar* characters = toRenderText(r->m_object)->characters();
+                for (int i = r->m_start; i < r->m_stop; i++) {
+                    UChar c = characters[i];
+                    if (c == ' ' || c == '\n' || c == '\t')
+                        spaces++;
+                }
+
+                ASSERT(spaces <= numSpaces);
+
+                // Only justify text if whitespace is collapsed.
+                if (r->m_object->style()->collapseWhiteSpace()) {
+                    spaceAdd = (availableLogicalWidth - totalLogicalWidth) * spaces / numSpaces;
+                    static_cast<InlineTextBox*>(r->m_box)->setSpaceAdd(spaceAdd);
+                    totalLogicalWidth += spaceAdd;
+                }
+                numSpaces -= spaces;
+                if (!numSpaces)
+                    break;
+            }
+        }
+    }
+
+    // The widths of all runs are now known.  We can now place every inline box (and
+    // compute accurate widths for the inline flow boxes).
+    needsWordSpacing = false;
+    lineBox->placeBoxesInInlineDirection(logicalLeft, needsWordSpacing, textBoxDataMap);
+}
+
+void RenderBlock::computeBlockDirectionPositionsForLine(RootInlineBox* lineBox, BidiRun* firstRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap,
+                                                        VerticalPositionCache& verticalPositionCache)
+{
+    setLogicalHeight(lineBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache));
+    lineBox->setBlockLogicalHeight(logicalHeight());
+
+    // Now make sure we place replaced render objects correctly.
+    for (BidiRun* r = firstRun; r; r = r->next()) {
+        ASSERT(r->m_box);
+        if (!r->m_box)
+            continue; // Skip runs with no line boxes.
+
+        // Align positioned boxes with the top of the line box.  This is
+        // a reasonable approximation of an appropriate y position.
+        if (r->m_object->isPositioned())
+            r->m_box->setLogicalTop(logicalHeight());
+
+        // Position is used to properly position both replaced elements and
+        // to update the static normal flow x/y of positioned elements.
+        if (r->m_object->isText())
+            toRenderText(r->m_object)->positionLineBox(r->m_box);
+        else if (r->m_object->isBox())
+            toRenderBox(r->m_object)->positionLineBox(r->m_box);
+    }
+    // Positioned objects and zero-length text nodes destroy their boxes in
+    // position(), which unnecessarily dirties the line.
+    lineBox->markDirty(false);
+}
+
+static inline bool isCollapsibleSpace(UChar character, RenderText* renderer)
+{
+    if (character == ' ' || character == '\t' || character == softHyphen)
+        return true;
+    if (character == '\n')
+        return !renderer->style()->preserveNewline();
+    if (character == noBreakSpace)
+        return renderer->style()->nbspMode() == SPACE;
+    return false;
+}
+
+void RenderBlock::layoutInlineChildren(bool relayoutChildren, int& repaintLogicalTop, int& repaintLogicalBottom)
+{
+    bool useRepaintBounds = false;
+    
+    m_overflow.clear();
+        
+    setLogicalHeight(borderBefore() + paddingBefore());
+
+    // Figure out if we should clear out our line boxes.
+    // FIXME: Handle resize eventually!
+    bool fullLayout = !firstLineBox() || selfNeedsLayout() || relayoutChildren;
+    if (fullLayout)
+        lineBoxes()->deleteLineBoxes(renderArena());
+
+    // Text truncation only kicks in if your overflow isn't visible and your text-overflow-mode isn't
+    // clip.
+    // FIXME: CSS3 says that descendants that are clipped must also know how to truncate.  This is insanely
+    // difficult to figure out (especially in the middle of doing layout), and is really an esoteric pile of nonsense
+    // anyway, so we won't worry about following the draft here.
+    bool hasTextOverflow = style()->textOverflow() && hasOverflowClip();
+
+    // Walk all the lines and delete our ellipsis line boxes if they exist.
+    if (hasTextOverflow)
+         deleteEllipsisLineBoxes();
+
+    if (firstChild()) {
+#ifdef ANDROID_LAYOUT
+        // if we are in fitColumnToScreen mode
+        // and the current object is not float:right in LTR or not float:left in RTL,
+        // and text align is auto, or justify or left in LTR, or right in RTL, we
+        // will wrap text around screen width so that it doesn't need to scroll
+        // horizontally when reading a paragraph.
+        // In case the line height is less than the font size, we skip
+        // the text wrapping since this will cause text overlapping.
+        // If a text has background image, we ignore text wrapping,
+        // otherwise the background will be potentially messed up.
+        const Settings* settings = document()->settings();
+        bool doTextWrap = settings && settings->layoutAlgorithm() == Settings::kLayoutFitColumnToScreen;
+        if (doTextWrap) {
+            int ta = style()->textAlign();
+            int dir = style()->direction();
+            bool autowrap = style()->autoWrap();
+            // if the RenderBlock is positioned, don't wrap text around screen
+            // width as it may cause text to overlap.
+            bool positioned = isPositioned();
+            EFloat cssfloat = style()->floating();
+            const int lineHeight = style()->computedLineHeight();
+            const int fontSize = style()->fontSize();
+            doTextWrap = autowrap && !positioned &&
+                    (fontSize <= lineHeight) && !style()->hasBackground() &&
+                    (((dir == LTR && cssfloat != FRIGHT) ||
+                    (dir == RTL && cssfloat != FLEFT)) &&
+                    ((ta == TAAUTO) || (ta == JUSTIFY) ||
+                    ((ta == LEFT || ta == WEBKIT_LEFT) && (dir == LTR)) ||
+                    ((ta == RIGHT || ta == WEBKIT_RIGHT) && (dir == RTL))));
+        }
+        bool hasTextToWrap = false;
+#endif
+        // layout replaced elements
+        bool endOfInline = false;
+        RenderObject* o = bidiFirst(this, 0, false);
+        Vector<FloatWithRect> floats;
+        bool hasInlineChild = false;
+        while (o) {
+            if (!hasInlineChild && o->isInline())
+                hasInlineChild = true;
+
+            if (o->isReplaced() || o->isFloating() || o->isPositioned()) {
+                RenderBox* box = toRenderBox(o);
+                
+                if (relayoutChildren || o->style()->width().isPercent() || o->style()->height().isPercent())
+                    o->setChildNeedsLayout(true, false);
+                    
+                // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths.
+                if (relayoutChildren && (o->style()->paddingStart().isPercent() || o->style()->paddingEnd().isPercent()))
+                    o->setPreferredLogicalWidthsDirty(true, false);
+            
+                if (o->isPositioned())
+                    o->containingBlock()->insertPositionedObject(box);
+#if PLATFORM(ANDROID)
+                else {
+#ifdef ANDROID_LAYOUT
+                    // ignore text wrap for textField or menuList
+                    if (doTextWrap && (o->isTextField() || o->isMenuList()))
+                        doTextWrap = false;
+#endif
+                    if (o->isFloating())
+                        floats.append(FloatWithRect(box));
+                    else if (fullLayout || o->needsLayout()) {
+                        // Replaced elements
+                        toRenderBox(o)->dirtyLineBoxes(fullLayout);
+                        o->layoutIfNeeded();
+                    }
+                }
+#else
+                else if (o->isFloating())
+                    floats.append(FloatWithRect(box));
+                else if (fullLayout || o->needsLayout()) {
+                    // Replaced elements
+                    toRenderBox(o)->dirtyLineBoxes(fullLayout);
+                    o->layoutIfNeeded();
+                }
+#endif // PLATFORM(ANDROID)
+            } else if (o->isText() || (o->isRenderInline() && !endOfInline)) {
+                if (fullLayout || o->selfNeedsLayout())
+                    dirtyLineBoxesForRenderer(o, fullLayout);
+                o->setNeedsLayout(false);
+#ifdef ANDROID_LAYOUT
+                if (doTextWrap && !hasTextToWrap && o->isText()) {
+                    Node* node = o->node();
+                    // as it is very common for sites to use a serial of <a> or
+                    // <li> as tabs, we don't force text to wrap if all the text
+                    // are short and within an <a> or <li> tag, and only separated
+                    // by short word like "|" or ";".
+                    if (node && node->isTextNode() &&
+                            !static_cast<Text*>(node)->containsOnlyWhitespace()) {
+                        int length = static_cast<Text*>(node)->length();
+                        // FIXME, need a magic number to decide it is too long to
+                        // be a tab. Pick 25 for now as it covers around 160px
+                        // (half of 320px) with the default font.
+                        if (length > 25 || (length > 3 &&
+                                (!node->parentOrHostNode()->hasTagName(HTMLNames::aTag) &&
+                                !node->parentOrHostNode()->hasTagName(HTMLNames::liTag))))
+                            hasTextToWrap = true;
+                    }
+                }
+#endif
+            }
+            o = bidiNext(this, o, 0, false, &endOfInline);
+        }
+
+#ifdef ANDROID_LAYOUT
+        // try to make sure that inline text will not span wider than the
+        // screen size unless the container has a fixed height,
+        if (doTextWrap && hasTextToWrap) {
+            // check all the nested containing blocks, unless it is table or
+            // table-cell, to make sure there is no fixed height as it implies
+            // fixed layout. If we constrain the text to fit screen, we may
+            // cause text overlap with the block after.
+            bool isConstrained = false;
+            RenderObject* obj = this;
+            while (obj) {
+                if (obj->style()->height().isFixed() && (!obj->isTable() && !obj->isTableCell())) {
+                    isConstrained = true;
+                    break;
+                }
+                if (obj->isFloating() || obj->isPositioned()) {
+                    // floating and absolute or fixed positioning are done out
+                    // of normal flow. Don't need to worry about height any more.
+                    break;
+                }
+                obj = obj->container();
+            }
+            if (!isConstrained) {
+                int textWrapWidth = view()->frameView()->textWrapWidth();
+                int padding = paddingLeft() + paddingRight();
+                if (textWrapWidth > 0 && width() > (textWrapWidth + padding)) {
+                    // limit the content width (width excluding padding) to be
+                    // (textWrapWidth - 2 * ANDROID_FCTS_MARGIN_PADDING)
+                    int maxWidth = textWrapWidth - 2 * ANDROID_FCTS_MARGIN_PADDING + padding;
+                    setWidth(min(width(), maxWidth));
+                    m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, maxWidth);
+                    m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, maxWidth);
+
+                    IntRect overflow = layoutOverflowRect();
+                    if (overflow.width() > maxWidth) {
+                        overflow.setWidth(maxWidth);
+                        clearLayoutOverflow();
+                        addLayoutOverflow(overflow);
+                    }
+                }
+            }
+        }
+#endif
+        // We want to skip ahead to the first dirty line
+        InlineBidiResolver resolver;
+        unsigned floatIndex;
+        bool firstLine = true;
+        bool previousLineBrokeCleanly = true;
+        RootInlineBox* startLine = determineStartPosition(firstLine, fullLayout, previousLineBrokeCleanly, resolver, floats, floatIndex,
+                                                          useRepaintBounds, repaintLogicalTop, repaintLogicalBottom);
+
+        if (fullLayout && hasInlineChild && !selfNeedsLayout()) {
+            setNeedsLayout(true, false);  // Mark ourselves as needing a full layout. This way we'll repaint like
+                                          // we're supposed to.
+            RenderView* v = view();
+            if (v && !v->doingFullRepaint() && hasLayer()) {
+                // Because we waited until we were already inside layout to discover
+                // that the block really needed a full layout, we missed our chance to repaint the layer
+                // before layout started.  Luckily the layer has cached the repaint rect for its original
+                // position and size, and so we can use that to make a repaint happen now.
+                repaintUsingContainer(containerForRepaint(), layer()->repaintRect());
+            }
+        }
+
+        FloatingObject* lastFloat = m_floatingObjects ? m_floatingObjects->last() : 0;
+
+        LineMidpointState& lineMidpointState = resolver.midpointState();
+
+        // We also find the first clean line and extract these lines.  We will add them back
+        // if we determine that we're able to synchronize after handling all our dirty lines.
+        InlineIterator cleanLineStart;
+        BidiStatus cleanLineBidiStatus;
+        int endLineLogicalTop = 0;
+        RootInlineBox* endLine = (fullLayout || !startLine) ? 
+                                 0 : determineEndPosition(startLine, cleanLineStart, cleanLineBidiStatus, endLineLogicalTop);
+
+        if (startLine) {
+            if (!useRepaintBounds) {
+                useRepaintBounds = true;
+                repaintLogicalTop = logicalHeight();
+                repaintLogicalBottom = logicalHeight();
+            }
+            RenderArena* arena = renderArena();
+            RootInlineBox* box = startLine;
+            while (box) {
+                repaintLogicalTop = min(repaintLogicalTop, beforeSideVisualOverflowForLine(box));
+                repaintLogicalBottom = max(repaintLogicalBottom, afterSideVisualOverflowForLine(box));
+                RootInlineBox* next = box->nextRootBox();
+                box->deleteLine(arena);
+                box = next;
+            }
+        }
+
+        InlineIterator end = resolver.position();
+
+        if (!fullLayout && lastRootBox() && lastRootBox()->endsWithBreak()) {
+            // If the last line before the start line ends with a line break that clear floats,
+            // adjust the height accordingly.
+            // A line break can be either the first or the last object on a line, depending on its direction.
+            if (InlineBox* lastLeafChild = lastRootBox()->lastLeafChild()) {
+                RenderObject* lastObject = lastLeafChild->renderer();
+                if (!lastObject->isBR())
+                    lastObject = lastRootBox()->firstLeafChild()->renderer();
+                if (lastObject->isBR()) {
+                    EClear clear = lastObject->style()->clear();
+                    if (clear != CNONE)
+                        newLine(clear);
+                }
+            }
+        }
+
+        bool endLineMatched = false;
+        bool checkForEndLineMatch = endLine;
+        bool checkForFloatsFromLastLine = false;
+
+        bool isLineEmpty = true;
+        bool paginated = view()->layoutState() && view()->layoutState()->isPaginated();
+
+        VerticalPositionCache verticalPositionCache;
+
+        while (!end.atEnd()) {
+            // FIXME: Is this check necessary before the first iteration or can it be moved to the end?
+            if (checkForEndLineMatch && (endLineMatched = matchedEndLine(resolver, cleanLineStart, cleanLineBidiStatus, endLine, endLineLogicalTop, repaintLogicalBottom, repaintLogicalTop)))
+                break;
+
+            lineMidpointState.reset();
+            
+            isLineEmpty = true;
+            
+            EClear clear = CNONE;
+            bool hyphenated;
+            
+            InlineIterator oldEnd = end;
+            FloatingObject* lastFloatFromPreviousLine = m_floatingObjects ? m_floatingObjects->last() : 0;
+            end = findNextLineBreak(resolver, firstLine, isLineEmpty, previousLineBrokeCleanly, hyphenated, &clear, lastFloatFromPreviousLine);
+            if (resolver.position().atEnd()) {
+                resolver.deleteRuns();
+                checkForFloatsFromLastLine = true;
+                break;
+            }
+            ASSERT(end != resolver.position());
+
+            if (!isLineEmpty) {
+                resolver.createBidiRunsForLine(end, style()->visuallyOrdered(), previousLineBrokeCleanly);
+                ASSERT(resolver.position() == end);
+
+                BidiRun* trailingSpaceRun = 0;
+                if (!previousLineBrokeCleanly && resolver.runCount() && resolver.logicallyLastRun()->m_object->style()->breakOnlyAfterWhiteSpace()
+                        && resolver.logicallyLastRun()->m_object->style()->autoWrap()) {
+                    trailingSpaceRun = resolver.logicallyLastRun();
+                    RenderObject* lastObject = trailingSpaceRun->m_object;
+                    if (lastObject->isText()) {
+                        RenderText* lastText = toRenderText(lastObject);
+                        const UChar* characters = lastText->characters();
+                        int firstSpace = trailingSpaceRun->stop();
+                        while (firstSpace > trailingSpaceRun->start()) {
+                            UChar current = characters[firstSpace - 1];
+                            if (!isCollapsibleSpace(current, lastText))
+                                break;
+                            firstSpace--;
+                        }
+                        if (firstSpace == trailingSpaceRun->stop())
+                            trailingSpaceRun = 0;
+                        else {
+                            TextDirection direction = style()->direction();
+                            bool shouldReorder = trailingSpaceRun != (direction == LTR ? resolver.lastRun() : resolver.firstRun());
+                            if (firstSpace != trailingSpaceRun->start()) {
+                                BidiContext* baseContext = resolver.context();
+                                while (BidiContext* parent = baseContext->parent())
+                                    baseContext = parent;
+
+                                BidiRun* newTrailingRun = new (renderArena()) BidiRun(firstSpace, trailingSpaceRun->m_stop, trailingSpaceRun->m_object, baseContext, OtherNeutral);
+                                trailingSpaceRun->m_stop = firstSpace;
+                                if (direction == LTR)
+                                    resolver.addRun(newTrailingRun);
+                                else
+                                    resolver.prependRun(newTrailingRun);
+                                trailingSpaceRun = newTrailingRun;
+                                shouldReorder = false;
+                            }
+                            if (shouldReorder) {
+                                if (direction == LTR) {
+                                    resolver.moveRunToEnd(trailingSpaceRun);
+                                    trailingSpaceRun->m_level = 0;
+                                } else {
+                                    resolver.moveRunToBeginning(trailingSpaceRun);
+                                    trailingSpaceRun->m_level = 1;
+                                }
+                            }
+                        }
+                    } else
+                        trailingSpaceRun = 0;
+                }
+
+                // Now that the runs have been ordered, we create the line boxes.
+                // At the same time we figure out where border/padding/margin should be applied for
+                // inline flow boxes.
+
+                RootInlineBox* lineBox = 0;
+                int oldLogicalHeight = logicalHeight();
+                if (resolver.runCount()) {
+                    if (hyphenated)
+                        resolver.logicallyLastRun()->m_hasHyphen = true;
+                    lineBox = constructLine(resolver.runCount(), resolver.firstRun(), resolver.lastRun(), firstLine, !end.obj, end.obj && !end.pos ? end.obj : 0);
+                    if (lineBox) {
+                        lineBox->setEndsWithBreak(previousLineBrokeCleanly);
+
+#if ENABLE(SVG)
+                        bool isSVGRootInlineBox = lineBox->isSVGRootInlineBox();
+#else
+                        bool isSVGRootInlineBox = false;
+#endif
+
+                        GlyphOverflowAndFallbackFontsMap textBoxDataMap;
+
+                        // Now we position all of our text runs horizontally.
+                        if (!isSVGRootInlineBox)
+                            computeInlineDirectionPositionsForLine(lineBox, firstLine, resolver.firstRun(), trailingSpaceRun, end.atEnd(), textBoxDataMap);
+
+                        // Now position our text runs vertically.
+                        computeBlockDirectionPositionsForLine(lineBox, resolver.firstRun(), textBoxDataMap, verticalPositionCache);
+
+#if ENABLE(SVG)
+                        // SVG text layout code computes vertical & horizontal positions on its own.
+                        // Note that we still need to execute computeVerticalPositionsForLine() as
+                        // it calls InlineTextBox::positionLineBox(), which tracks whether the box
+                        // contains reversed text or not. If we wouldn't do that editing and thus
+                        // text selection in RTL boxes would not work as expected.
+                        if (isSVGRootInlineBox) {
+                            ASSERT(isSVGText());
+                            static_cast<SVGRootInlineBox*>(lineBox)->computePerCharacterLayoutInformation();
+                        }
+#endif
+
+                        // Compute our overflow now.
+                        lineBox->computeOverflow(lineBox->lineTop(), lineBox->lineBottom(), document()->inNoQuirksMode(), textBoxDataMap);
+    
+#if PLATFORM(MAC)
+                        // Highlight acts as an overflow inflation.
+                        if (style()->highlight() != nullAtom)
+                            lineBox->addHighlightOverflow();
+#endif
+                    }
+                }
+
+                resolver.deleteRuns();
+
+                if (lineBox) {
+                    lineBox->setLineBreakInfo(end.obj, end.pos, resolver.status());
+                    if (useRepaintBounds) {
+                        repaintLogicalTop = min(repaintLogicalTop, beforeSideVisualOverflowForLine(lineBox));
+                        repaintLogicalBottom = max(repaintLogicalBottom, afterSideVisualOverflowForLine(lineBox));
+                    }
+                    
+                    if (paginated) {
+                        int adjustment = 0;
+                        adjustLinePositionForPagination(lineBox, adjustment);
+                        if (adjustment) {
+                            int oldLineWidth = availableLogicalWidthForLine(oldLogicalHeight, firstLine);
+                            lineBox->adjustPosition(0, adjustment);
+                            if (useRepaintBounds) // This can only be a positive adjustment, so no need to update repaintTop.
+                                repaintLogicalBottom = max(repaintLogicalBottom, afterSideVisualOverflowForLine(lineBox));
+                                
+                            if (availableLogicalWidthForLine(oldLogicalHeight + adjustment, firstLine) != oldLineWidth) {
+                                // We have to delete this line, remove all floats that got added, and let line layout re-run.
+                                lineBox->deleteLine(renderArena());
+                                removeFloatingObjectsBelow(lastFloatFromPreviousLine, oldLogicalHeight);
+                                setLogicalHeight(oldLogicalHeight + adjustment);
+                                resolver.setPosition(oldEnd);
+                                end = oldEnd;
+                                continue;
+                            }
+
+                            setLogicalHeight(lineBox->blockLogicalHeight());
+                        }
+                    }
+                }
+
+                firstLine = false;
+                newLine(clear);
+            }
+
+            if (m_floatingObjects && lastRootBox()) {
+                if (lastFloat) {
+                    for (FloatingObject* f = m_floatingObjects->last(); f != lastFloat; f = m_floatingObjects->prev()) {
+                    }
+                    m_floatingObjects->next();
+                } else
+                    m_floatingObjects->first();
+                for (FloatingObject* f = m_floatingObjects->current(); f; f = m_floatingObjects->next()) {
+                    lastRootBox()->floats().append(f->m_renderer);
+                    ASSERT(f->m_renderer == floats[floatIndex].object);
+                    // If a float's geometry has changed, give up on syncing with clean lines.
+                    if (floats[floatIndex].rect != f->frameRect())
+                        checkForEndLineMatch = false;
+                    floatIndex++;
+                }
+                lastFloat = m_floatingObjects->last();
+            }
+
+            lineMidpointState.reset();
+            resolver.setPosition(end);
+        }
+
+        if (endLine) {
+            if (endLineMatched) {
+                // Attach all the remaining lines, and then adjust their y-positions as needed.
+                int delta = logicalHeight() - endLineLogicalTop;
+                for (RootInlineBox* line = endLine; line; line = line->nextRootBox()) {
+                    line->attachLine();
+                    if (paginated) {
+                        delta -= line->paginationStrut();
+                        adjustLinePositionForPagination(line, delta);
+                    }
+                    if (delta) {
+                        repaintLogicalTop = min(repaintLogicalTop, beforeSideVisualOverflowForLine(line) + min(delta, 0));
+                        repaintLogicalBottom = max(repaintLogicalBottom, afterSideVisualOverflowForLine(line) + max(delta, 0));
+                        line->adjustPosition(0, delta);
+                    }
+                    if (Vector<RenderBox*>* cleanLineFloats = line->floatsPtr()) {
+                        Vector<RenderBox*>::iterator end = cleanLineFloats->end();
+                        for (Vector<RenderBox*>::iterator f = cleanLineFloats->begin(); f != end; ++f) {
+                            insertFloatingObject(*f);
+                            setLogicalHeight(logicalTopForChild(*f) - marginBeforeForChild(*f) + delta);
+                            positionNewFloats();
+                        }
+                    }
+                }
+                setLogicalHeight(lastRootBox()->blockLogicalHeight());
+            } else {
+                // Delete all the remaining lines.
+                RootInlineBox* line = endLine;
+                RenderArena* arena = renderArena();
+                while (line) {
+                    repaintLogicalTop = min(repaintLogicalTop, beforeSideVisualOverflowForLine(line));
+                    repaintLogicalBottom = max(repaintLogicalBottom, afterSideVisualOverflowForLine(line));
+                    RootInlineBox* next = line->nextRootBox();
+                    line->deleteLine(arena);
+                    line = next;
+                }
+            }
+        }
+        if (m_floatingObjects && (checkForFloatsFromLastLine || positionNewFloats()) && lastRootBox()) {
+            // In case we have a float on the last line, it might not be positioned up to now.
+            // This has to be done before adding in the bottom border/padding, or the float will
+            // include the padding incorrectly. -dwh
+            if (checkForFloatsFromLastLine) {
+                int bottomVisualOverflow = afterSideVisualOverflowForLine(lastRootBox());
+                int bottomLayoutOverflow = afterSideLayoutOverflowForLine(lastRootBox());
+                TrailingFloatsRootInlineBox* trailingFloatsLineBox = new (renderArena()) TrailingFloatsRootInlineBox(this);
+                m_lineBoxes.appendLineBox(trailingFloatsLineBox);
+                trailingFloatsLineBox->setConstructed();
+                GlyphOverflowAndFallbackFontsMap textBoxDataMap;
+                VerticalPositionCache verticalPositionCache;
+                trailingFloatsLineBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache);
+                IntRect logicalLayoutOverflow(0, logicalHeight(), 1, bottomLayoutOverflow);
+                IntRect logicalVisualOverflow(0, logicalHeight(), 1, bottomVisualOverflow);
+                trailingFloatsLineBox->setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow);
+                trailingFloatsLineBox->setBlockLogicalHeight(logicalHeight());
+            }
+            if (lastFloat) {
+                for (FloatingObject* f = m_floatingObjects->last(); f != lastFloat; f = m_floatingObjects->prev()) {
+                }
+                m_floatingObjects->next();
+            } else
+                m_floatingObjects->first();
+            for (FloatingObject* f = m_floatingObjects->current(); f; f = m_floatingObjects->next())
+                lastRootBox()->floats().append(f->m_renderer);
+            lastFloat = m_floatingObjects->last();
+        }
+        size_t floatCount = floats.size();
+        // Floats that did not have layout did not repaint when we laid them out. They would have
+        // painted by now if they had moved, but if they stayed at (0, 0), they still need to be
+        // painted.
+        for (size_t i = 0; i < floatCount; ++i) {
+            if (!floats[i].everHadLayout) {
+                RenderBox* f = floats[i].object;
+                if (!f->x() && !f->y() && f->checkForRepaintDuringLayout())
+                    f->repaint();
+            }
+        }
+    }
+
+    // Expand the last line to accommodate Ruby and emphasis marks.
+    int lastLineAnnotationsAdjustment = 0;
+    if (lastRootBox()) {
+        int lowestAllowedPosition = max(lastRootBox()->lineBottom(), logicalHeight() + paddingAfter());
+        if (!style()->isFlippedLinesWritingMode())
+            lastLineAnnotationsAdjustment = lastRootBox()->computeUnderAnnotationAdjustment(lowestAllowedPosition);
+        else
+            lastLineAnnotationsAdjustment = lastRootBox()->computeOverAnnotationAdjustment(lowestAllowedPosition);
+    }
+
+    // Now add in the bottom border/padding.
+    setLogicalHeight(logicalHeight() + lastLineAnnotationsAdjustment + borderAfter() + paddingAfter() + scrollbarLogicalHeight());
+
+    if (!firstLineBox() && hasLineIfEmpty())
+        setLogicalHeight(logicalHeight() + lineHeight(true, style()->isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes));
+
+    // See if we have any lines that spill out of our block.  If we do, then we will possibly need to
+    // truncate text.
+    if (hasTextOverflow)
+        checkLinesForTextOverflow();
+}
+
+RootInlineBox* RenderBlock::determineStartPosition(bool& firstLine, bool& fullLayout, bool& previousLineBrokeCleanly, 
+                                                   InlineBidiResolver& resolver, Vector<FloatWithRect>& floats, unsigned& numCleanFloats,
+                                                   bool& useRepaintBounds, int& repaintLogicalTop, int& repaintLogicalBottom)
+{
+    RootInlineBox* curr = 0;
+    RootInlineBox* last = 0;
+
+    bool dirtiedByFloat = false;
+    if (!fullLayout) {
+        // Paginate all of the clean lines.
+        bool paginated = view()->layoutState() && view()->layoutState()->isPaginated();
+        int paginationDelta = 0;
+        size_t floatIndex = 0;
+        for (curr = firstRootBox(); curr && !curr->isDirty(); curr = curr->nextRootBox()) {
+            if (paginated) {
+                paginationDelta -= curr->paginationStrut();
+                adjustLinePositionForPagination(curr, paginationDelta);
+                if (paginationDelta) {
+                    if (containsFloats() || !floats.isEmpty()) {
+                        // FIXME: Do better eventually.  For now if we ever shift because of pagination and floats are present just go to a full layout.
+                        fullLayout = true; 
+                        break;
+                    }
+                    
+                    if (!useRepaintBounds)
+                        useRepaintBounds = true;
+                        
+                    repaintLogicalTop = min(repaintLogicalTop, beforeSideVisualOverflowForLine(curr) + min(paginationDelta, 0));
+                    repaintLogicalBottom = max(repaintLogicalBottom, afterSideVisualOverflowForLine(curr) + max(paginationDelta, 0));
+                    curr->adjustPosition(0, paginationDelta);
+                }                
+            }
+            
+            if (Vector<RenderBox*>* cleanLineFloats = curr->floatsPtr()) {
+                Vector<RenderBox*>::iterator end = cleanLineFloats->end();
+                for (Vector<RenderBox*>::iterator o = cleanLineFloats->begin(); o != end; ++o) {
+                    RenderBox* f = *o;
+                    f->layoutIfNeeded();
+                    IntSize newSize(f->width() + f->marginLeft() + f->marginRight(), f->height() + f->marginTop() + f->marginBottom());
+                    ASSERT(floatIndex < floats.size());
+                    if (floats[floatIndex].object != f) {
+                        // A new float has been inserted before this line or before its last known float.
+                        // Just do a full layout.
+                        fullLayout = true;
+                        break;
+                    }
+                    if (floats[floatIndex].rect.size() != newSize) {
+                        int floatTop = style()->isHorizontalWritingMode() ? floats[floatIndex].rect.y() : floats[floatIndex].rect.x();
+                        int floatHeight = style()->isHorizontalWritingMode() ? max(floats[floatIndex].rect.height(), newSize.height()) 
+                                                                             : max(floats[floatIndex].rect.width(), newSize.width());
+                        curr->markDirty();
+                        markLinesDirtyInBlockRange(curr->blockLogicalHeight(), floatTop + floatHeight, curr);
+                        floats[floatIndex].rect.setSize(newSize);
+                        dirtiedByFloat = true;
+                    }
+                    floatIndex++;
+                }
+            }
+            if (dirtiedByFloat || fullLayout)
+                break;
+        }
+        // Check if a new float has been inserted after the last known float.
+        if (!curr && floatIndex < floats.size())
+            fullLayout = true;
+    }
+
+    if (fullLayout) {
+        // Nuke all our lines.
+        if (firstRootBox()) {
+            RenderArena* arena = renderArena();
+            curr = firstRootBox(); 
+            while (curr) {
+                RootInlineBox* next = curr->nextRootBox();
+                curr->deleteLine(arena);
+                curr = next;
+            }
+            ASSERT(!firstLineBox() && !lastLineBox());
+        }
+    } else {
+        if (curr) {
+            // We have a dirty line.
+            if (RootInlineBox* prevRootBox = curr->prevRootBox()) {
+                // We have a previous line.
+                if (!dirtiedByFloat && (!prevRootBox->endsWithBreak() || (prevRootBox->lineBreakObj()->isText() && prevRootBox->lineBreakPos() >= toRenderText(prevRootBox->lineBreakObj())->textLength())))
+                    // The previous line didn't break cleanly or broke at a newline
+                    // that has been deleted, so treat it as dirty too.
+                    curr = prevRootBox;
+            }
+        } else {
+            // No dirty lines were found.
+            // If the last line didn't break cleanly, treat it as dirty.
+            if (lastRootBox() && !lastRootBox()->endsWithBreak())
+                curr = lastRootBox();
+        }
+
+        // If we have no dirty lines, then last is just the last root box.
+        last = curr ? curr->prevRootBox() : lastRootBox();
+    }
+
+    numCleanFloats = 0;
+    if (!floats.isEmpty()) {
+        int savedLogicalHeight = logicalHeight();
+        // Restore floats from clean lines.
+        RootInlineBox* line = firstRootBox();
+        while (line != curr) {
+            if (Vector<RenderBox*>* cleanLineFloats = line->floatsPtr()) {
+                Vector<RenderBox*>::iterator end = cleanLineFloats->end();
+                for (Vector<RenderBox*>::iterator f = cleanLineFloats->begin(); f != end; ++f) {
+                    insertFloatingObject(*f);
+                    setLogicalHeight(logicalTopForChild(*f) - marginBeforeForChild(*f));
+                    positionNewFloats();
+                    ASSERT(floats[numCleanFloats].object == *f);
+                    numCleanFloats++;
+                }
+            }
+            line = line->nextRootBox();
+        }
+        setLogicalHeight(savedLogicalHeight);
+    }
+
+    firstLine = !last;
+    previousLineBrokeCleanly = !last || last->endsWithBreak();
+
+    RenderObject* startObj;
+    int pos = 0;
+    if (last) {
+        setLogicalHeight(last->blockLogicalHeight());
+        startObj = last->lineBreakObj();
+        pos = last->lineBreakPos();
+        resolver.setStatus(last->lineBreakBidiStatus());
+    } else {
+        bool ltr = style()->isLeftToRightDirection()
+    #if ENABLE(SVG)   
+            || (style()->unicodeBidi() == UBNormal && isSVGText())
+    #endif
+            ;
+
+        Direction direction = ltr ? LeftToRight : RightToLeft;
+        resolver.setLastStrongDir(direction);
+        resolver.setLastDir(direction);
+        resolver.setEorDir(direction);
+        resolver.setContext(BidiContext::create(ltr ? 0 : 1, direction, style()->unicodeBidi() == Override));
+
+        startObj = bidiFirst(this, &resolver);
+    }
+
+    resolver.setPosition(InlineIterator(this, startObj, pos));
+
+    return curr;
+}
+
+RootInlineBox* RenderBlock::determineEndPosition(RootInlineBox* startLine, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus, int& logicalTop)
+{
+    RootInlineBox* last = 0;
+    if (!startLine)
+        last = 0;
+    else {
+        for (RootInlineBox* curr = startLine->nextRootBox(); curr; curr = curr->nextRootBox()) {
+            if (curr->isDirty())
+                last = 0;
+            else if (!last)
+                last = curr;
+        }
+    }
+
+    if (!last)
+        return 0;
+
+    RootInlineBox* prev = last->prevRootBox();
+    cleanLineStart = InlineIterator(this, prev->lineBreakObj(), prev->lineBreakPos());
+    cleanLineBidiStatus = prev->lineBreakBidiStatus();
+    logicalTop = prev->blockLogicalHeight();
+
+    for (RootInlineBox* line = last; line; line = line->nextRootBox())
+        line->extractLine(); // Disconnect all line boxes from their render objects while preserving
+                             // their connections to one another.
+
+    return last;
+}
+
+bool RenderBlock::matchedEndLine(const InlineBidiResolver& resolver, const InlineIterator& endLineStart, const BidiStatus& endLineStatus, RootInlineBox*& endLine,
+                                 int& endLogicalTop, int& repaintLogicalBottom, int& repaintLogicalTop)
+{
+    if (resolver.position() == endLineStart) {
+        if (resolver.status() != endLineStatus)
+            return false;
+
+        int delta = logicalHeight() - endLogicalTop;
+        if (!delta || !m_floatingObjects)
+            return true;
+
+        // See if any floats end in the range along which we want to shift the lines vertically.
+        int logicalTop = min(logicalHeight(), endLogicalTop);
+
+        RootInlineBox* lastLine = endLine;
+        while (RootInlineBox* nextLine = lastLine->nextRootBox())
+            lastLine = nextLine;
+
+        int logicalBottom = lastLine->blockLogicalHeight() + abs(delta);
+
+        for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {
+            if (logicalBottomForFloat(f) >= logicalTop && logicalBottomForFloat(f) < logicalBottom)
+                return false;
+        }
+
+        return true;
+    }
+
+    // The first clean line doesn't match, but we can check a handful of following lines to try
+    // to match back up.
+    static int numLines = 8; // The # of lines we're willing to match against.
+    RootInlineBox* line = endLine;
+    for (int i = 0; i < numLines && line; i++, line = line->nextRootBox()) {
+        if (line->lineBreakObj() == resolver.position().obj && line->lineBreakPos() == resolver.position().pos) {
+            // We have a match.
+            if (line->lineBreakBidiStatus() != resolver.status())
+                return false; // ...but the bidi state doesn't match.
+            RootInlineBox* result = line->nextRootBox();
+
+            // Set our logical top to be the block height of endLine.
+            if (result)
+                endLogicalTop = line->blockLogicalHeight();
+
+            int delta = logicalHeight() - endLogicalTop;
+            if (delta && m_floatingObjects) {
+                // See if any floats end in the range along which we want to shift the lines vertically.
+                int logicalTop = min(logicalHeight(), endLogicalTop);
+
+                RootInlineBox* lastLine = endLine;
+                while (RootInlineBox* nextLine = lastLine->nextRootBox())
+                    lastLine = nextLine;
+
+                int logicalBottom = lastLine->blockLogicalHeight() + abs(delta);
+
+                for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {
+                    if (logicalBottomForFloat(f) >= logicalTop && logicalBottomForFloat(f) < logicalBottom)
+                        return false;
+                }
+            }
+
+            // Now delete the lines that we failed to sync.
+            RootInlineBox* boxToDelete = endLine;
+            RenderArena* arena = renderArena();
+            while (boxToDelete && boxToDelete != result) {
+                repaintLogicalTop = min(repaintLogicalTop, beforeSideVisualOverflowForLine(boxToDelete));
+                repaintLogicalBottom = max(repaintLogicalBottom, afterSideVisualOverflowForLine(boxToDelete));
+                RootInlineBox* next = boxToDelete->nextRootBox();
+                boxToDelete->deleteLine(arena);
+                boxToDelete = next;
+            }
+
+            endLine = result;
+            return result;
+        }
+    }
+
+    return false;
+}
+
+static inline bool skipNonBreakingSpace(const InlineIterator& it, bool isLineEmpty, bool previousLineBrokeCleanly)
+{
+    if (it.obj->style()->nbspMode() != SPACE || it.current() != noBreakSpace)
+        return false;
+
+    // FIXME: This is bad.  It makes nbsp inconsistent with space and won't work correctly
+    // with m_minWidth/m_maxWidth.
+    // Do not skip a non-breaking space if it is the first character
+    // on a line after a clean line break (or on the first line, since previousLineBrokeCleanly starts off
+    // |true|).
+    if (isLineEmpty && previousLineBrokeCleanly)
+        return false;
+
+    return true;
+}
+
+static inline bool shouldCollapseWhiteSpace(const RenderStyle* style, bool isLineEmpty, bool previousLineBrokeCleanly)
+{
+    return style->collapseWhiteSpace() || (style->whiteSpace() == PRE_WRAP && (!isLineEmpty || !previousLineBrokeCleanly));
+}
+
+static inline bool shouldPreserveNewline(RenderObject* object)
+{
+#if ENABLE(SVG)
+    if (object->isSVGInlineText())
+        return false;
+#endif
+
+    return object->style()->preserveNewline();
+}
+
+static bool inlineFlowRequiresLineBox(RenderInline* flow)
+{
+    // FIXME: Right now, we only allow line boxes for inlines that are truly empty.
+    // We need to fix this, though, because at the very least, inlines containing only
+    // ignorable whitespace should should also have line boxes. 
+    return !flow->firstChild() && flow->hasInlineDirectionBordersPaddingOrMargin();
+}
+
+bool RenderBlock::requiresLineBox(const InlineIterator& it, bool isLineEmpty, bool previousLineBrokeCleanly)
+{
+    if (it.obj->isFloatingOrPositioned())
+        return false;
+
+    if (it.obj->isRenderInline() && !inlineFlowRequiresLineBox(toRenderInline(it.obj)))
+        return false;
+
+    if (!shouldCollapseWhiteSpace(it.obj->style(), isLineEmpty, previousLineBrokeCleanly) || it.obj->isBR())
+        return true;
+
+    UChar current = it.current();
+    return current != ' ' && current != '\t' && current != softHyphen && (current != '\n' || shouldPreserveNewline(it.obj)) 
+            && !skipNonBreakingSpace(it, isLineEmpty, previousLineBrokeCleanly);
+}
+
+bool RenderBlock::generatesLineBoxesForInlineChild(RenderObject* inlineObj, bool isLineEmpty, bool previousLineBrokeCleanly)
+{
+    ASSERT(inlineObj->parent() == this);
+
+    InlineIterator it(this, inlineObj, 0);
+    while (!it.atEnd() && !requiresLineBox(it, isLineEmpty, previousLineBrokeCleanly))
+        it.increment();
+
+    return !it.atEnd();
+}
+
+// FIXME: The entire concept of the skipTrailingWhitespace function is flawed, since we really need to be building
+// line boxes even for containers that may ultimately collapse away.  Otherwise we'll never get positioned
+// elements quite right.  In other words, we need to build this function's work into the normal line
+// object iteration process.
+// NB. this function will insert any floating elements that would otherwise
+// be skipped but it will not position them.
+void RenderBlock::skipTrailingWhitespace(InlineIterator& iterator, bool isLineEmpty, bool previousLineBrokeCleanly)
+{
+    while (!iterator.atEnd() && !requiresLineBox(iterator, isLineEmpty, previousLineBrokeCleanly)) {
+        RenderObject* object = iterator.obj;
+        if (object->isFloating()) {
+            insertFloatingObject(toRenderBox(object));
+        } else if (object->isPositioned()) {
+            // FIXME: The math here is actually not really right.  It's a best-guess approximation that
+            // will work for the common cases
+            RenderObject* c = object->container();
+            if (c->isRenderInline()) {
+                // A relative positioned inline encloses us.  In this case, we also have to determine our
+                // position as though we were an inline.  Set |staticX| and |staticY| on the relative positioned
+                // inline so that we can obtain the value later.
+                toRenderInline(c)->layer()->setStaticX(style()->isLeftToRightDirection() ? logicalLeftOffsetForLine(height(), false) : logicalRightOffsetForLine(height(), false));
+                toRenderInline(c)->layer()->setStaticY(height());
+            }
+    
+            RenderBox* box = toRenderBox(object);
+            if (box->style()->hasStaticX()) {
+                if (box->style()->isOriginalDisplayInlineType())
+                    box->layer()->setStaticX(style()->isLeftToRightDirection() ? logicalLeftOffsetForLine(height(), false) : width() - logicalRightOffsetForLine(height(), false));
+                else
+                    box->layer()->setStaticX(style()->isLeftToRightDirection() ? borderLeft() + paddingLeft() : borderRight() + paddingRight());
+            }
+    
+            if (box->style()->hasStaticY())
+                box->layer()->setStaticY(height());
+        }
+        iterator.increment();
+    }
+}
+
+int RenderBlock::skipLeadingWhitespace(InlineBidiResolver& resolver, bool firstLine, bool isLineEmpty, bool previousLineBrokeCleanly,
+                                       FloatingObject* lastFloatFromPreviousLine)
+{
+    int availableWidth = availableLogicalWidthForLine(logicalHeight(), firstLine);
+    while (!resolver.position().atEnd() && !requiresLineBox(resolver.position(), isLineEmpty, previousLineBrokeCleanly)) {
+        RenderObject* object = resolver.position().obj;
+        if (object->isFloating()) {
+            positionNewFloatOnLine(insertFloatingObject(toRenderBox(object)), lastFloatFromPreviousLine);
+            availableWidth = availableLogicalWidthForLine(logicalHeight(), firstLine);
+        } else if (object->isPositioned()) {
+            // FIXME: The math here is actually not really right.  It's a best-guess approximation that
+            // will work for the common cases
+            RenderObject* c = object->container();
+            if (c->isRenderInline()) {
+                // A relative positioned inline encloses us.  In this case, we also have to determine our
+                // position as though we were an inline.  Set |staticX| and |staticY| on the relative positioned
+                // inline so that we can obtain the value later.
+                toRenderInline(c)->layer()->setStaticX(style()->isLeftToRightDirection() ? logicalLeftOffsetForLine(height(), firstLine) : logicalRightOffsetForLine(height(), firstLine));
+                toRenderInline(c)->layer()->setStaticY(height());
+            }
+    
+            RenderBox* box = toRenderBox(object);
+            if (box->style()->hasStaticX()) {
+                if (box->style()->isOriginalDisplayInlineType())
+                    box->layer()->setStaticX(style()->isLeftToRightDirection() ? logicalLeftOffsetForLine(height(), firstLine) : width() - logicalRightOffsetForLine(height(), firstLine));
+                else
+                    box->layer()->setStaticX(style()->isLeftToRightDirection() ? borderLeft() + paddingLeft() : borderRight() + paddingRight());
+            }
+    
+            if (box->style()->hasStaticY())
+                box->layer()->setStaticY(height());
+        }
+        resolver.increment();
+    }
+    resolver.commitExplicitEmbedding();
+    return availableWidth;
+}
+
+// This is currently just used for list markers and inline flows that have line boxes. Neither should 
+// have an effect on whitespace at the start of the line. 
+static bool shouldSkipWhitespaceAfterStartObject(RenderBlock* block, RenderObject* o, LineMidpointState& lineMidpointState)
+{
+    RenderObject* next = bidiNext(block, o);
+    if (next && !next->isBR() && next->isText() && toRenderText(next)->textLength() > 0) {
+        RenderText* nextText = toRenderText(next);
+        UChar nextChar = nextText->characters()[0];
+        if (nextText->style()->isCollapsibleWhiteSpace(nextChar)) {
+            addMidpoint(lineMidpointState, InlineIterator(0, o, 0));
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void RenderBlock::fitBelowFloats(int widthToFit, bool firstLine, int& availableWidth)
+{
+    ASSERT(widthToFit > availableWidth);
+
+    int floatLogicalBottom;
+    int lastFloatLogicalBottom = logicalHeight();
+    int newLineWidth = availableWidth;
+    while (true) {
+        floatLogicalBottom = nextFloatLogicalBottomBelow(lastFloatLogicalBottom);
+        if (!floatLogicalBottom)
+            break;
+
+        newLineWidth = availableLogicalWidthForLine(floatLogicalBottom, firstLine);
+        lastFloatLogicalBottom = floatLogicalBottom;
+        if (newLineWidth >= widthToFit)
+            break;
+    }
+
+    if (newLineWidth > availableWidth) {
+        setLogicalHeight(lastFloatLogicalBottom);
+        availableWidth = newLineWidth;
+    }
+}
+
+static inline unsigned textWidth(RenderText* text, unsigned from, unsigned len, const Font& font, int xPos, bool isFixedPitch, bool collapseWhiteSpace)
+{
+    if (isFixedPitch || (!from && len == text->textLength()))
+        return text->width(from, len, font, xPos);
+    return font.width(TextRun(text->characters() + from, len, !collapseWhiteSpace, xPos));
+}
+
+static void tryHyphenating(RenderText* text, const Font& font, const AtomicString& localeIdentifier, int lastSpace, int pos, int xPos, int availableWidth, bool isFixedPitch, bool collapseWhiteSpace, int lastSpaceWordSpacing, InlineIterator& lineBreak, int nextBreakable, bool& hyphenated)
+{
+    const AtomicString& hyphenString = text->style()->hyphenString();
+    int hyphenWidth = font.width(TextRun(hyphenString.characters(), hyphenString.length()));
+
+    int maxPrefixWidth = availableWidth - xPos - hyphenWidth - lastSpaceWordSpacing;
+    // If the maximum width available for the prefix before the hyphen is small, then it is very unlikely
+    // that an hyphenation opportunity exists, so do not bother to look for it.
+    if (maxPrefixWidth <= font.pixelSize() * 5 / 4)
+        return;
+
+    unsigned prefixLength = font.offsetForPosition(TextRun(text->characters() + lastSpace, pos - lastSpace, !collapseWhiteSpace, xPos + lastSpaceWordSpacing), maxPrefixWidth, false);
+    if (!prefixLength)
+        return;
+
+    prefixLength = lastHyphenLocation(text->characters() + lastSpace, pos - lastSpace, prefixLength + 1, localeIdentifier);
+    if (!prefixLength)
+        return;
+
+#if !ASSERT_DISABLED
+    int prefixWidth = hyphenWidth + textWidth(text, lastSpace, prefixLength, font, xPos, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
+    ASSERT(xPos + prefixWidth <= availableWidth);
+#else
+    UNUSED_PARAM(isFixedPitch);
+#endif
+
+    lineBreak.obj = text;
+    lineBreak.pos = lastSpace + prefixLength;
+    lineBreak.nextBreakablePosition = nextBreakable;
+    hyphenated = true;
+}
+
+InlineIterator RenderBlock::findNextLineBreak(InlineBidiResolver& resolver, bool firstLine,  bool& isLineEmpty, bool& previousLineBrokeCleanly, 
+                                              bool& hyphenated, EClear* clear, FloatingObject* lastFloatFromPreviousLine)
+{
+    ASSERT(resolver.position().block == this);
+
+    bool appliedStartWidth = resolver.position().pos > 0;
+    LineMidpointState& lineMidpointState = resolver.midpointState();
+    
+    int width = skipLeadingWhitespace(resolver, firstLine, isLineEmpty, previousLineBrokeCleanly, lastFloatFromPreviousLine);
+
+    int w = 0;
+    int tmpW = 0;
+
+    if (resolver.position().atEnd())
+        return resolver.position();
+
+    // This variable is used only if whitespace isn't set to PRE, and it tells us whether
+    // or not we are currently ignoring whitespace.
+    bool ignoringSpaces = false;
+    InlineIterator ignoreStart;
+    
+    // This variable tracks whether the very last character we saw was a space.  We use
+    // this to detect when we encounter a second space so we know we have to terminate
+    // a run.
+    bool currentCharacterIsSpace = false;
+    bool currentCharacterIsWS = false;
+    RenderObject* trailingSpaceObject = 0;
+
+    InlineIterator lBreak = resolver.position();
+
+    RenderObject *o = resolver.position().obj;
+    RenderObject *last = o;
+    unsigned pos = resolver.position().pos;
+    int nextBreakable = resolver.position().nextBreakablePosition;
+    bool atStart = true;
+
+    bool prevLineBrokeCleanly = previousLineBrokeCleanly;
+    previousLineBrokeCleanly = false;
+
+    hyphenated = false;
+
+    bool autoWrapWasEverTrueOnLine = false;
+    bool floatsFitOnLine = true;
+    
+    // Firefox and Opera will allow a table cell to grow to fit an image inside it under
+    // very specific circumstances (in order to match common WinIE renderings). 
+    // Not supporting the quirk has caused us to mis-render some real sites. (See Bugzilla 10517.) 
+    bool allowImagesToBreak = !document()->inQuirksMode() || !isTableCell() || !style()->logicalWidth().isIntrinsicOrAuto();
+
+    EWhiteSpace currWS = style()->whiteSpace();
+    EWhiteSpace lastWS = currWS;
+    while (o) {
+        currWS = o->isReplaced() ? o->parent()->style()->whiteSpace() : o->style()->whiteSpace();
+        lastWS = last->isReplaced() ? last->parent()->style()->whiteSpace() : last->style()->whiteSpace();
+        
+        bool autoWrap = RenderStyle::autoWrap(currWS);
+        autoWrapWasEverTrueOnLine = autoWrapWasEverTrueOnLine || autoWrap;
+
+#if ENABLE(SVG)
+        bool preserveNewline = o->isSVGInlineText() ? false : RenderStyle::preserveNewline(currWS);
+#else
+        bool preserveNewline = RenderStyle::preserveNewline(currWS);
+#endif
+
+        bool collapseWhiteSpace = RenderStyle::collapseWhiteSpace(currWS);
+            
+        if (o->isBR()) {
+            if (w + tmpW <= width) {
+                lBreak.obj = o;
+                lBreak.pos = 0;
+                lBreak.nextBreakablePosition = -1;
+                lBreak.increment();
+
+                // A <br> always breaks a line, so don't let the line be collapsed
+                // away. Also, the space at the end of a line with a <br> does not
+                // get collapsed away.  It only does this if the previous line broke
+                // cleanly.  Otherwise the <br> has no effect on whether the line is
+                // empty or not.
+                if (prevLineBrokeCleanly)
+                    isLineEmpty = false;
+                trailingSpaceObject = 0;
+                previousLineBrokeCleanly = true;
+
+                if (!isLineEmpty && clear)
+                    *clear = o->style()->clear();
+            }
+            goto end;
+        }
+
+        if (o->isFloatingOrPositioned()) {
+            // add to special objects...
+            if (o->isFloating()) {
+                RenderBox* floatBox = toRenderBox(o);
+                FloatingObject* f = insertFloatingObject(floatBox);
+                // check if it fits in the current line.
+                // If it does, position it now, otherwise, position
+                // it after moving to next line (in newLine() func)
+                if (floatsFitOnLine && logicalWidthForFloat(f) + w + tmpW <= width) {
+                    positionNewFloatOnLine(f, lastFloatFromPreviousLine);
+                    width = availableLogicalWidthForLine(logicalHeight(), firstLine);
+                } else
+                    floatsFitOnLine = false;
+            } else if (o->isPositioned()) {
+                // If our original display wasn't an inline type, then we can
+                // go ahead and determine our static x position now.
+                RenderBox* box = toRenderBox(o);
+                bool isInlineType = box->style()->isOriginalDisplayInlineType();
+                bool needToSetStaticX = box->style()->hasStaticX();
+                if (box->style()->hasStaticX() && !isInlineType) {
+                    box->layer()->setStaticX(o->parent()->style()->isLeftToRightDirection() ?
+                                  borderLeft() + paddingLeft() :
+                                  borderRight() + paddingRight());
+                    needToSetStaticX = false;
+                }
+
+                // If our original display was an INLINE type, then we can go ahead
+                // and determine our static y position now.
+                bool needToSetStaticY = box->style()->hasStaticY();
+                if (box->style()->hasStaticY() && isInlineType) {
+                    box->layer()->setStaticY(height());
+                    needToSetStaticY = false;
+                }
+                
+                bool needToCreateLineBox = needToSetStaticX || needToSetStaticY;
+                RenderObject* c = o->container();
+                if (c->isRenderInline() && (!needToSetStaticX || !needToSetStaticY))
+                    needToCreateLineBox = true;
+
+                // If we're ignoring spaces, we have to stop and include this object and
+                // then start ignoring spaces again.
+                if (needToCreateLineBox) {
+                    trailingSpaceObject = 0;
+                    ignoreStart.obj = o;
+                    ignoreStart.pos = 0;
+                    if (ignoringSpaces) {
+                        addMidpoint(lineMidpointState, ignoreStart); // Stop ignoring spaces.
+                        addMidpoint(lineMidpointState, ignoreStart); // Start ignoring again.
+                    }
+                    
+                }
+            }
+        } else if (o->isRenderInline()) {
+            // Right now, we should only encounter empty inlines here.
+            ASSERT(!o->firstChild());
+    
+            RenderInline* flowBox = toRenderInline(o);
+            
+            // Now that some inline flows have line boxes, if we are already ignoring spaces, we need 
+            // to make sure that we stop to include this object and then start ignoring spaces again. 
+            // If this object is at the start of the line, we need to behave like list markers and 
+            // start ignoring spaces.
+            if (inlineFlowRequiresLineBox(flowBox)) {
+                isLineEmpty = false;
+                if (ignoringSpaces) {
+                    trailingSpaceObject = 0;
+                    addMidpoint(lineMidpointState, InlineIterator(0, o, 0)); // Stop ignoring spaces.
+                    addMidpoint(lineMidpointState, InlineIterator(0, o, 0)); // Start ignoring again.
+                } else if (style()->collapseWhiteSpace() && resolver.position().obj == o
+                    && shouldSkipWhitespaceAfterStartObject(this, o, lineMidpointState)) {
+                    // Like with list markers, we start ignoring spaces to make sure that any 
+                    // additional spaces we see will be discarded.
+                    currentCharacterIsSpace = true;
+                    currentCharacterIsWS = true;
+                    ignoringSpaces = true;
+                }
+            }
+
+            tmpW += flowBox->marginStart() + flowBox->borderStart() + flowBox->paddingStart() +
+                    flowBox->marginEnd() + flowBox->borderEnd() + flowBox->paddingEnd();
+        } else if (o->isReplaced()) {
+            RenderBox* replacedBox = toRenderBox(o);
+
+            // Break on replaced elements if either has normal white-space.
+            if ((autoWrap || RenderStyle::autoWrap(lastWS)) && (!o->isImage() || allowImagesToBreak)) {
+                w += tmpW;
+                tmpW = 0;
+                lBreak.obj = o;
+                lBreak.pos = 0;
+                lBreak.nextBreakablePosition = -1;
+            }
+
+            if (ignoringSpaces)
+                addMidpoint(lineMidpointState, InlineIterator(0, o, 0));
+
+            isLineEmpty = false;
+            ignoringSpaces = false;
+            currentCharacterIsSpace = false;
+            currentCharacterIsWS = false;
+            trailingSpaceObject = 0;
+
+            // Optimize for a common case. If we can't find whitespace after the list
+            // item, then this is all moot.
+            int replacedLogicalWidth = logicalWidthForChild(replacedBox) + marginStartForChild(replacedBox) + marginEndForChild(replacedBox) + inlineLogicalWidth(o);
+            if (o->isListMarker()) {
+                if (style()->collapseWhiteSpace() && shouldSkipWhitespaceAfterStartObject(this, o, lineMidpointState)) {
+                    // Like with inline flows, we start ignoring spaces to make sure that any 
+                    // additional spaces we see will be discarded.
+                    currentCharacterIsSpace = true;
+                    currentCharacterIsWS = true;
+                    ignoringSpaces = true;
+                }
+                if (toRenderListMarker(o)->isInside())
+                    tmpW += replacedLogicalWidth;
+            } else
+                tmpW += replacedLogicalWidth;
+        } else if (o->isText()) {
+            if (!pos)
+                appliedStartWidth = false;
+
+            RenderText* t = toRenderText(o);
+
+#if ENABLE(SVG)
+            bool isSVGText = t->isSVGInlineText();
+#endif
+
+            int strlen = t->textLength();
+            int len = strlen - pos;
+            const UChar* str = t->characters();
+
+            RenderStyle* style = t->style(firstLine);
+            const Font& f = style->font();
+            bool isFixedPitch = f.isFixedPitch();
+            bool canHyphenate = style->hyphens() == HyphensAuto && WebCore::canHyphenate(style->hyphenationLocale());
+
+            int lastSpace = pos;
+            int wordSpacing = o->style()->wordSpacing();
+            int lastSpaceWordSpacing = 0;
+
+            // Non-zero only when kerning is enabled, in which case we measure words with their trailing
+            // space, then subtract its width.
+            int wordTrailingSpaceWidth = f.typesettingFeatures() & Kerning ? f.width(TextRun(&space, 1)) + wordSpacing : 0;
+
+            int wrapW = tmpW + inlineLogicalWidth(o, !appliedStartWidth, true);
+            int charWidth = 0;
+            bool breakNBSP = autoWrap && o->style()->nbspMode() == SPACE;
+            // Auto-wrapping text should wrap in the middle of a word only if it could not wrap before the word,
+            // which is only possible if the word is the first thing on the line, that is, if |w| is zero.
+            bool breakWords = o->style()->breakWords() && ((autoWrap && !w) || currWS == PRE);
+            bool midWordBreak = false;
+            bool breakAll = o->style()->wordBreak() == BreakAllWordBreak && autoWrap;
+            int hyphenWidth = 0;
+
+            if (t->isWordBreak()) {
+                w += tmpW;
+                tmpW = 0;
+                lBreak.obj = o;
+                lBreak.pos = 0;
+                lBreak.nextBreakablePosition = -1;
+                ASSERT(!len);
+            }
+
+            while (len) {
+                bool previousCharacterIsSpace = currentCharacterIsSpace;
+                bool previousCharacterIsWS = currentCharacterIsWS;
+                UChar c = str[pos];
+                currentCharacterIsSpace = c == ' ' || c == '\t' || (!preserveNewline && (c == '\n'));
+
+                if (!collapseWhiteSpace || !currentCharacterIsSpace)
+                    isLineEmpty = false;
+
+                if (c == softHyphen && autoWrap && !hyphenWidth && style->hyphens() != HyphensNone) {
+                    const AtomicString& hyphenString = style->hyphenString();
+                    hyphenWidth = f.width(TextRun(hyphenString.characters(), hyphenString.length()));
+                    tmpW += hyphenWidth;
+                }
+
+#if ENABLE(SVG)
+                if (isSVGText) {
+                    RenderSVGInlineText* svgInlineText = static_cast<RenderSVGInlineText*>(t);
+                    if (pos > 0) {
+                        if (svgInlineText->characterStartsNewTextChunk(pos)) {
+                            addMidpoint(lineMidpointState, InlineIterator(0, o, pos - 1));
+                            addMidpoint(lineMidpointState, InlineIterator(0, o, pos));
+                        }
+                    }
+                }
+#endif
+
+                bool applyWordSpacing = false;
+                
+                currentCharacterIsWS = currentCharacterIsSpace || (breakNBSP && c == noBreakSpace);
+
+                if ((breakAll || breakWords) && !midWordBreak) {
+                    wrapW += charWidth;
+                    charWidth = textWidth(t, pos, 1, f, w + wrapW, isFixedPitch, collapseWhiteSpace);
+                    midWordBreak = w + wrapW + charWidth > width;
+                }
+
+                bool betweenWords = c == '\n' || (currWS != PRE && !atStart && isBreakable(str, pos, strlen, nextBreakable, breakNBSP) && (style->hyphens() != HyphensNone || (pos && str[pos - 1] != softHyphen)));
+
+                if (betweenWords || midWordBreak) {
+                    bool stoppedIgnoringSpaces = false;
+                    if (ignoringSpaces) {
+                        if (!currentCharacterIsSpace) {
+                            // Stop ignoring spaces and begin at this
+                            // new point.
+                            ignoringSpaces = false;
+                            lastSpaceWordSpacing = 0;
+                            lastSpace = pos; // e.g., "Foo    goo", don't add in any of the ignored spaces.
+                            addMidpoint(lineMidpointState, InlineIterator(0, o, pos));
+                            stoppedIgnoringSpaces = true;
+                        } else {
+                            // Just keep ignoring these spaces.
+                            pos++;
+                            len--;
+                            continue;
+                        }
+                    }
+
+                    int additionalTmpW;
+                    if (wordTrailingSpaceWidth && currentCharacterIsSpace)
+                        additionalTmpW = textWidth(t, lastSpace, pos + 1 - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) - wordTrailingSpaceWidth + lastSpaceWordSpacing;
+                    else
+                        additionalTmpW = textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
+                    tmpW += additionalTmpW;
+                    if (!appliedStartWidth) {
+                        tmpW += inlineLogicalWidth(o, true, false);
+                        appliedStartWidth = true;
+                    }
+                    
+                    applyWordSpacing =  wordSpacing && currentCharacterIsSpace && !previousCharacterIsSpace;
+
+                    if (!w && autoWrap && tmpW > width)
+                        fitBelowFloats(tmpW, firstLine, width);
+
+                    if (autoWrap || breakWords) {
+                        // If we break only after white-space, consider the current character
+                        // as candidate width for this line.
+                        bool lineWasTooWide = false;
+                        if (w + tmpW <= width && currentCharacterIsWS && o->style()->breakOnlyAfterWhiteSpace() && !midWordBreak) {
+                            int charWidth = textWidth(t, pos, 1, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + (applyWordSpacing ? wordSpacing : 0);
+                            // Check if line is too big even without the extra space
+                            // at the end of the line. If it is not, do nothing. 
+                            // If the line needs the extra whitespace to be too long, 
+                            // then move the line break to the space and skip all 
+                            // additional whitespace.
+                            if (w + tmpW + charWidth > width) {
+                                lineWasTooWide = true;
+                                lBreak.obj = o;
+                                lBreak.pos = pos;
+                                lBreak.nextBreakablePosition = nextBreakable;
+                                skipTrailingWhitespace(lBreak, isLineEmpty, previousLineBrokeCleanly);
+                            }
+                        }
+                        if (lineWasTooWide || w + tmpW > width) {
+                            if (canHyphenate && w + tmpW > width) {
+                                tryHyphenating(t, f, style->hyphenationLocale(), lastSpace, pos, w + tmpW - additionalTmpW, width, isFixedPitch, collapseWhiteSpace, lastSpaceWordSpacing, lBreak, nextBreakable, hyphenated);
+                                if (hyphenated)
+                                    goto end;
+                            }
+                            if (lBreak.obj && shouldPreserveNewline(lBreak.obj) && lBreak.obj->isText() && toRenderText(lBreak.obj)->textLength() && !toRenderText(lBreak.obj)->isWordBreak() && toRenderText(lBreak.obj)->characters()[lBreak.pos] == '\n') {
+                                if (!stoppedIgnoringSpaces && pos > 0) {
+                                    // We need to stop right before the newline and then start up again.
+                                    addMidpoint(lineMidpointState, InlineIterator(0, o, pos - 1)); // Stop
+                                    addMidpoint(lineMidpointState, InlineIterator(0, o, pos)); // Start
+                                }
+                                lBreak.increment();
+                                previousLineBrokeCleanly = true;
+                            }
+                            if (lBreak.obj && lBreak.pos && lBreak.obj->isText() && toRenderText(lBreak.obj)->textLength() && toRenderText(lBreak.obj)->characters()[lBreak.pos - 1] == softHyphen && style->hyphens() != HyphensNone)
+                                hyphenated = true;
+                            goto end; // Didn't fit. Jump to the end.
+                        } else {
+                            if (!betweenWords || (midWordBreak && !autoWrap))
+                                tmpW -= additionalTmpW;
+                            if (hyphenWidth) {
+                                // Subtract the width of the soft hyphen out since we fit on a line.
+                                tmpW -= hyphenWidth;
+                                hyphenWidth = 0;
+                            }
+                        }
+                    }
+
+                    if (c == '\n' && preserveNewline) {
+                        if (!stoppedIgnoringSpaces && pos > 0) {
+                            // We need to stop right before the newline and then start up again.
+                            addMidpoint(lineMidpointState, InlineIterator(0, o, pos - 1)); // Stop
+                            addMidpoint(lineMidpointState, InlineIterator(0, o, pos)); // Start
+                        }
+                        lBreak.obj = o;
+                        lBreak.pos = pos;
+                        lBreak.nextBreakablePosition = nextBreakable;
+                        lBreak.increment();
+                        previousLineBrokeCleanly = true;
+                        return lBreak;
+                    }
+
+                    if (autoWrap && betweenWords) {
+                        w += tmpW;
+                        wrapW = 0;
+                        tmpW = 0;
+                        lBreak.obj = o;
+                        lBreak.pos = pos;
+                        lBreak.nextBreakablePosition = nextBreakable;
+                        // Auto-wrapping text should not wrap in the middle of a word once it has had an
+                        // opportunity to break after a word.
+                        breakWords = false;
+                    }
+                    
+                    if (midWordBreak) {
+                        // Remember this as a breakable position in case
+                        // adding the end width forces a break.
+                        lBreak.obj = o;
+                        lBreak.pos = pos;
+                        lBreak.nextBreakablePosition = nextBreakable;
+                        midWordBreak &= (breakWords || breakAll);
+                    }
+
+                    if (betweenWords) {
+                        lastSpaceWordSpacing = applyWordSpacing ? wordSpacing : 0;
+                        lastSpace = pos;
+                    }
+                    
+                    if (!ignoringSpaces && o->style()->collapseWhiteSpace()) {
+                        // If we encounter a newline, or if we encounter a
+                        // second space, we need to go ahead and break up this
+                        // run and enter a mode where we start collapsing spaces.
+                        if (currentCharacterIsSpace && previousCharacterIsSpace) {
+                            ignoringSpaces = true;
+                            
+                            // We just entered a mode where we are ignoring
+                            // spaces. Create a midpoint to terminate the run
+                            // before the second space. 
+                            addMidpoint(lineMidpointState, ignoreStart);
+                        }
+                    }
+                } else if (ignoringSpaces) {
+                    // Stop ignoring spaces and begin at this
+                    // new point.
+                    ignoringSpaces = false;
+                    lastSpaceWordSpacing = applyWordSpacing ? wordSpacing : 0;
+                    lastSpace = pos; // e.g., "Foo    goo", don't add in any of the ignored spaces.
+                    addMidpoint(lineMidpointState, InlineIterator(0, o, pos));
+                }
+
+                if (currentCharacterIsSpace && !previousCharacterIsSpace) {
+                    ignoreStart.obj = o;
+                    ignoreStart.pos = pos;
+                }
+
+                if (!currentCharacterIsWS && previousCharacterIsWS) {
+                    if (autoWrap && o->style()->breakOnlyAfterWhiteSpace()) {
+                        lBreak.obj = o;
+                        lBreak.pos = pos;
+                        lBreak.nextBreakablePosition = nextBreakable;
+                    }
+                }
+                
+                if (collapseWhiteSpace && currentCharacterIsSpace && !ignoringSpaces)
+                    trailingSpaceObject = o;
+                else if (!o->style()->collapseWhiteSpace() || !currentCharacterIsSpace)
+                    trailingSpaceObject = 0;
+                    
+                pos++;
+                len--;
+                atStart = false;
+            }
+
+            // IMPORTANT: pos is > length here!
+            int additionalTmpW = ignoringSpaces ? 0 : textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
+            tmpW += additionalTmpW;
+            tmpW += inlineLogicalWidth(o, !appliedStartWidth, true);
+
+            if (canHyphenate && w + tmpW > width) {
+                tryHyphenating(t, f, style->hyphenationLocale(), lastSpace, pos, w + tmpW - additionalTmpW, width, isFixedPitch, collapseWhiteSpace, lastSpaceWordSpacing, lBreak, nextBreakable, hyphenated);
+                if (hyphenated)
+                    goto end;
+            }
+        } else
+            ASSERT_NOT_REACHED();
+
+        RenderObject* next = bidiNext(this, o);
+        bool checkForBreak = autoWrap;
+        if (w && w + tmpW > width && lBreak.obj && currWS == NOWRAP)
+            checkForBreak = true;
+        else if (next && o->isText() && next->isText() && !next->isBR()) {
+            if (autoWrap || (next->style()->autoWrap())) {
+                if (currentCharacterIsSpace)
+                    checkForBreak = true;
+                else {
+                    checkForBreak = false;
+                    RenderText* nextText = toRenderText(next);
+                    if (nextText->textLength()) {
+                        UChar c = nextText->characters()[0];
+                        if (c == ' ' || c == '\t' || (c == '\n' && !shouldPreserveNewline(next)))
+                            // If the next item on the line is text, and if we did not end with
+                            // a space, then the next text run continues our word (and so it needs to
+                            // keep adding to |tmpW|.  Just update and continue.
+                            checkForBreak = true;
+                    } else if (nextText->isWordBreak())
+                        checkForBreak = true;
+                    bool willFitOnLine = w + tmpW <= width;
+                    if (!willFitOnLine && !w) {
+                        fitBelowFloats(tmpW, firstLine, width);
+                        willFitOnLine = tmpW <= width;
+                    }
+                    bool canPlaceOnLine = willFitOnLine || !autoWrapWasEverTrueOnLine;
+                    if (canPlaceOnLine && checkForBreak) {
+                        w += tmpW;
+                        tmpW = 0;
+                        lBreak.obj = next;
+                        lBreak.pos = 0;
+                        lBreak.nextBreakablePosition = -1;
+                    }
+                }
+            }
+        }
+
+        if (checkForBreak && (w + tmpW > width)) {
+            // if we have floats, try to get below them.
+            if (currentCharacterIsSpace && !ignoringSpaces && o->style()->collapseWhiteSpace())
+                trailingSpaceObject = 0;
+
+            if (w)
+                goto end;
+
+            fitBelowFloats(tmpW, firstLine, width);
+
+            // |width| may have been adjusted because we got shoved down past a float (thus
+            // giving us more room), so we need to retest, and only jump to
+            // the end label if we still don't fit on the line. -dwh
+            if (w + tmpW > width)
+                goto end;
+        }
+
+        if (!o->isFloatingOrPositioned()) {
+            last = o;
+            if (last->isReplaced() && autoWrap && (!last->isImage() || allowImagesToBreak) && (!last->isListMarker() || toRenderListMarker(last)->isInside())) {
+                w += tmpW;
+                tmpW = 0;
+                lBreak.obj = next;
+                lBreak.pos = 0;
+                lBreak.nextBreakablePosition = -1;
+            }
+        }
+
+        o = next;
+        nextBreakable = -1;
+
+        // Clear out our character space bool, since inline <pre>s don't collapse whitespace
+        // with adjacent inline normal/nowrap spans.
+        if (!collapseWhiteSpace)
+            currentCharacterIsSpace = false;
+        
+        pos = 0;
+        atStart = false;
+    }
+
+    
+    if (w + tmpW <= width || lastWS == NOWRAP) {
+        lBreak.obj = 0;
+        lBreak.pos = 0;
+        lBreak.nextBreakablePosition = -1;
+    }
+
+ end:
+    if (lBreak == resolver.position() && (!lBreak.obj || !lBreak.obj->isBR())) {
+        // we just add as much as possible
+        if (style()->whiteSpace() == PRE) {
+            // FIXME: Don't really understand this case.
+            if (pos != 0) {
+                lBreak.obj = o;
+                lBreak.pos = pos - 1;
+            } else {
+                lBreak.obj = last;
+                lBreak.pos = last->isText() ? last->length() : 0;
+                lBreak.nextBreakablePosition = -1;
+            }
+        } else if (lBreak.obj) {
+            // Don't ever break in the middle of a word if we can help it.
+            // There's no room at all. We just have to be on this line,
+            // even though we'll spill out.
+            lBreak.obj = o;
+            lBreak.pos = pos;
+            lBreak.nextBreakablePosition = -1;
+        }
+    }
+
+    // make sure we consume at least one char/object.
+    if (lBreak == resolver.position())
+        lBreak.increment();
+
+    // Sanity check our midpoints.
+    checkMidpoints(lineMidpointState, lBreak);
+        
+    if (trailingSpaceObject) {
+        // This object is either going to be part of the last midpoint, or it is going
+        // to be the actual endpoint.  In both cases we just decrease our pos by 1 level to
+        // exclude the space, allowing it to - in effect - collapse into the newline.
+        if (lineMidpointState.numMidpoints % 2) {
+            InlineIterator* midpoints = lineMidpointState.midpoints.data();
+            midpoints[lineMidpointState.numMidpoints - 1].pos--;
+        }
+        //else if (lBreak.pos > 0)
+        //    lBreak.pos--;
+        else if (lBreak.obj == 0 && trailingSpaceObject->isText()) {
+            // Add a new end midpoint that stops right at the very end.
+            RenderText* text = toRenderText(trailingSpaceObject);
+            unsigned length = text->textLength();
+            unsigned pos = length >= 2 ? length - 2 : UINT_MAX;
+            InlineIterator endMid(0, trailingSpaceObject, pos);
+            addMidpoint(lineMidpointState, endMid);
+        }
+    }
+
+    // We might have made lBreak an iterator that points past the end
+    // of the object. Do this adjustment to make it point to the start
+    // of the next object instead to avoid confusing the rest of the
+    // code.
+    if (lBreak.pos > 0) {
+        lBreak.pos--;
+        lBreak.increment();
+    }
+
+    return lBreak;
+}
+
+void RenderBlock::addOverflowFromInlineChildren()
+{
+    int endPadding = hasOverflowClip() ? paddingEnd() : 0;
+    // FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to.
+    if (hasOverflowClip() && !endPadding && node() && node()->isContentEditable() && node() == node()->rootEditableElement() && style()->isLeftToRightDirection())
+        endPadding = 1;
+    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
+        addLayoutOverflow(curr->paddedLayoutOverflowRect(endPadding));
+        if (!hasOverflowClip())
+            addVisualOverflow(curr->visualOverflowRect());
+    }
+}
+
+int RenderBlock::beforeSideVisualOverflowForLine(RootInlineBox* line) const
+{
+    // Overflow is in the block's coordinate space, which means it isn't purely physical.  For flipped blocks (rl and bt),
+    // we continue to use top and left overflow even though physically it's bottom and right.
+    if (style()->isHorizontalWritingMode())
+        return line->topVisualOverflow();
+    return line->leftVisualOverflow();
+}
+
+int RenderBlock::afterSideVisualOverflowForLine(RootInlineBox* line) const
+{
+    // Overflow is in the block's coordinate space, which means it isn't purely physical.  For flipped blocks (rl and bt),
+    // we continue to use bottom and right overflow even though physically it's top and left.
+    if (style()->isHorizontalWritingMode())
+        return line->bottomVisualOverflow();
+    return line->rightVisualOverflow();
+}
+
+int RenderBlock::beforeSideLayoutOverflowForLine(RootInlineBox* line) const
+{
+    // Overflow is in the block's coordinate space, which means it isn't purely physical.  For flipped blocks (rl and bt),
+    // we continue to use top and left overflow even though physically it's bottom and right.
+    if (style()->isHorizontalWritingMode())
+        return line->topLayoutOverflow();
+    return line->leftLayoutOverflow();
+}
+
+int RenderBlock::afterSideLayoutOverflowForLine(RootInlineBox* line) const
+{
+    // Overflow is in the block's coordinate space, which means it isn't purely physical.  For flipped blocks (rl and bt),
+    // we continue to use bottom and right overflow even though physically it's top and left.
+    if (style()->isHorizontalWritingMode())
+        return line->bottomLayoutOverflow();
+    return line->rightLayoutOverflow();
+}
+
+void RenderBlock::deleteEllipsisLineBoxes()
+{
+    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox())
+        curr->clearTruncation();
+}
+
+void RenderBlock::checkLinesForTextOverflow()
+{
+    // Determine the width of the ellipsis using the current font.
+    // FIXME: CSS3 says this is configurable, also need to use 0x002E (FULL STOP) if horizontal ellipsis is "not renderable"
+    TextRun ellipsisRun(&horizontalEllipsis, 1);
+    DEFINE_STATIC_LOCAL(AtomicString, ellipsisStr, (&horizontalEllipsis, 1));
+    const Font& firstLineFont = firstLineStyle()->font();
+    const Font& font = style()->font();
+    int firstLineEllipsisWidth = firstLineFont.width(ellipsisRun);
+    int ellipsisWidth = (font == firstLineFont) ? firstLineEllipsisWidth : font.width(ellipsisRun);
+
+    // For LTR text truncation, we want to get the right edge of our padding box, and then we want to see
+    // if the right edge of a line box exceeds that.  For RTL, we use the left edge of the padding box and
+    // check the left edge of the line box to see if it is less
+    // Include the scrollbar for overflow blocks, which means we want to use "contentWidth()"
+    bool ltr = style()->isLeftToRightDirection();
+    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
+        int blockRightEdge = logicalRightOffsetForLine(curr->y(), curr == firstRootBox());
+        int blockLeftEdge = logicalLeftOffsetForLine(curr->y(), curr == firstRootBox());
+        int lineBoxEdge = ltr ? curr->x() + curr->logicalWidth() : curr->x();
+        if ((ltr && lineBoxEdge > blockRightEdge) || (!ltr && lineBoxEdge < blockLeftEdge)) {
+            // This line spills out of our box in the appropriate direction.  Now we need to see if the line
+            // can be truncated.  In order for truncation to be possible, the line must have sufficient space to
+            // accommodate our truncation string, and no replaced elements (images, tables) can overlap the ellipsis
+            // space.
+            int width = curr == firstRootBox() ? firstLineEllipsisWidth : ellipsisWidth;
+            int blockEdge = ltr ? blockRightEdge : blockLeftEdge;
+            if (curr->canAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width))
+                curr->placeEllipsis(ellipsisStr, ltr, blockLeftEdge, blockRightEdge, width);
+        }
+    }
+}
+
+}