Revert the merge. Mac build is mysteriously broken.

third_party/WebKit/WebCore/rendering/bidi.cpp

Index: third_party/WebKit/WebCore/rendering/bidi.cpp
===================================================================
--- third_party/WebKit/WebCore/rendering/bidi.cpp	(revision 9383)
+++ third_party/WebKit/WebCore/rendering/bidi.cpp	(working copy)
@@ -1,2208 +1,2205 @@
-/*
- * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
- * Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All right 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 "bidi.h"
-
-#include "CharacterNames.h"
-#include "Document.h"
-#include "Element.h"
-#include "FrameView.h"
-#include "InlineTextBox.h"
-#include "Logging.h"
-#include "RenderArena.h"
-#include "RenderInline.h"
-#include "RenderLayer.h"
-#include "RenderListMarker.h"
-#include "RenderView.h"
-#include "break_lines.h"
-#include <wtf/AlwaysInline.h>
-#include <wtf/RefCountedLeakCounter.h>
-#include <wtf/StdLibExtras.h>
-#include <wtf/Vector.h>
-
-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;
-
-class InlineIterator {
-public:
-    InlineIterator()
-        : block(0)
-        , obj(0)
-        , pos(0)
-        , nextBreakablePosition(-1)
-    {
-    }
-
-    InlineIterator(RenderBlock* b, RenderObject* o, unsigned p)
-        : block(b)
-        , obj(o)
-        , pos(p)
-        , nextBreakablePosition(-1)
-    {
-    }
-
-    void increment(InlineBidiResolver* resolver = 0);
-    bool atEnd() const;
-
-    UChar current() const;
-    WTF::Unicode::Direction direction() const;
-
-    RenderBlock* block;
-    RenderObject* obj;
-    unsigned pos;
-    int nextBreakablePosition;
-};
-
-// Midpoint globals.  The goal is not to do any allocation when dealing with
-// these midpoints, so we just keep an array around and never clear it.  We track
-// the number of items and position using the two other variables.
-static Vector<InlineIterator>* smidpoints;
-static unsigned sNumMidpoints;
-static unsigned sCurrMidpoint;
-static bool betweenMidpoints;
-
-static bool isLineEmpty = true;
-static bool previousLineBrokeCleanly = true;
-
-static int getBorderPaddingMargin(RenderBox* child, bool endOfInline)
-{
-    bool leftSide = (child->style()->direction() == LTR) ? !endOfInline : endOfInline;
-    if (leftSide)
-        return child->marginLeft() + child->paddingLeft() + child->borderLeft();
-    return child->marginRight() + child->paddingRight() + child->borderRight();
-}
-
-static int inlineWidth(RenderObject* child, bool start = true, bool end = true)
-{
-    unsigned lineDepth = 1;
-    int extraWidth = 0;
-    RenderObject* parent = child->parent();
-    while (parent->isBox() && parent->isInline() && !parent->isInlineBlockOrInlineTable() && lineDepth++ < cMaxLineDepth) {
-        if (start && !child->previousSibling())
-            extraWidth += getBorderPaddingMargin(toRenderBox(parent), false);
-        if (end && !child->nextSibling())
-            extraWidth += getBorderPaddingMargin(toRenderBox(parent), true);
-        child = parent;
-        parent = child->parent();
-    }
-    return extraWidth;
-}
-
-#ifndef NDEBUG
-static WTF::RefCountedLeakCounter bidiRunCounter("BidiRun");
-
-static bool inBidiRunDestroy;
-#endif
-
-void BidiRun::destroy()
-{
-#ifndef NDEBUG
-    inBidiRunDestroy = true;
-#endif
-    RenderArena* renderArena = m_object->renderArena();
-    delete this;
-#ifndef NDEBUG
-    inBidiRunDestroy = false;
-#endif
-
-    // Recover the size left there for us by operator delete and free the memory.
-    renderArena->free(*reinterpret_cast<size_t*>(this), this);
-}
-
-void* BidiRun::operator new(size_t sz, RenderArena* renderArena) throw()
-{
-#ifndef NDEBUG
-    bidiRunCounter.increment();
-#endif
-    return renderArena->allocate(sz);
-}
-
-void BidiRun::operator delete(void* ptr, size_t sz)
-{
-#ifndef NDEBUG
-    bidiRunCounter.decrement();
-#endif
-    ASSERT(inBidiRunDestroy);
-
-    // Stash size where destroy() can find it.
-    *(size_t*)ptr = sz;
-}
-
-// ---------------------------------------------------------------------
-
-inline bool operator==(const InlineIterator& it1, const InlineIterator& it2)
-{
-    return it1.pos == it2.pos && it1.obj == it2.obj;
-}
-
-inline bool operator!=(const InlineIterator& it1, const InlineIterator& it2)
-{
-    return it1.pos != it2.pos || it1.obj != it2.obj;
-}
-
-static inline RenderObject* bidiNext(RenderBlock* block, RenderObject* current, InlineBidiResolver* resolver = 0, bool skipInlines = true, bool* endOfInlinePtr = 0)
-{
-    RenderObject* next = 0;
-    bool oldEndOfInline = endOfInlinePtr ? *endOfInlinePtr : false;
-    bool endOfInline = false;
-
-    while (current) {
-        next = 0;
-        if (!oldEndOfInline && !current->isFloating() && !current->isReplaced() && !current->isPositioned() && !current->isText()) {
-            next = current->firstChild();
-            if (next && resolver && next->isRenderInline()) {
-                EUnicodeBidi ub = next->style()->unicodeBidi();
-                if (ub != UBNormal) {
-                    TextDirection dir = next->style()->direction();
-                    Direction d = (ub == Embed
-                        ? (dir == RTL ? RightToLeftEmbedding : LeftToRightEmbedding)
-                        : (dir == RTL ? RightToLeftOverride : LeftToRightOverride));
-                    resolver->embed(d);
-                }
-            }
-        }
-
-        if (!next) {
-            if (!skipInlines && !oldEndOfInline && current->isRenderInline()) {
-                next = current;
-                endOfInline = true;
-                break;
-            }
-
-            while (current && current != block) {
-                if (resolver && current->isRenderInline() && current->style()->unicodeBidi() != UBNormal)
-                    resolver->embed(PopDirectionalFormat);
-
-                next = current->nextSibling();
-                if (next) {
-                    if (resolver && next->isRenderInline()) {
-                        EUnicodeBidi ub = next->style()->unicodeBidi();
-                        if (ub != UBNormal) {
-                            TextDirection dir = next->style()->direction();
-                            Direction d = (ub == Embed
-                                ? (dir == RTL ? RightToLeftEmbedding: LeftToRightEmbedding)
-                                : (dir == RTL ? RightToLeftOverride : LeftToRightOverride));
-                            resolver->embed(d);
-                        }
-                    }
-                    break;
-                }
-                
-                current = current->parent();
-                if (!skipInlines && current && current != block && current->isRenderInline()) {
-                    next = current;
-                    endOfInline = true;
-                    break;
-                }
-            }
-        }
-
-        if (!next)
-            break;
-
-        if (next->isText() || next->isFloating() || next->isReplaced() || next->isPositioned()
-            || ((!skipInlines || !next->firstChild()) // Always return EMPTY inlines.
-                && next->isRenderInline()))
-            break;
-        current = next;
-    }
-
-    if (endOfInlinePtr)
-        *endOfInlinePtr = endOfInline;
-
-    return next;
-}
-
-static RenderObject* bidiFirst(RenderBlock* block, InlineBidiResolver* resolver, bool skipInlines = true)
-{
-    if (!block->firstChild())
-        return 0;
-    
-    RenderObject* o = block->firstChild();
-    if (o->isRenderInline()) {
-        if (resolver) {
-            EUnicodeBidi ub = o->style()->unicodeBidi();
-            if (ub != UBNormal) {
-                TextDirection dir = o->style()->direction();
-                Direction d = (ub == Embed
-                    ? (dir == RTL ? RightToLeftEmbedding : LeftToRightEmbedding)
-                    : (dir == RTL ? RightToLeftOverride : LeftToRightOverride));
-                resolver->embed(d);
-            }
-        }
-        if (skipInlines && o->firstChild())
-            o = bidiNext(block, o, resolver, skipInlines);
-        else {
-            // Never skip empty inlines.
-            if (resolver)
-                resolver->commitExplicitEmbedding();
-            return o; 
-        }
-    }
-
-    if (o && !o->isText() && !o->isReplaced() && !o->isFloating() && !o->isPositioned())
-        o = bidiNext(block, o, resolver, skipInlines);
-
-    if (resolver)
-        resolver->commitExplicitEmbedding();
-    return o;
-}
-
-inline void InlineIterator::increment(InlineBidiResolver* resolver)
-{
-    if (!obj)
-        return;
-    if (obj->isText()) {
-        pos++;
-        if (pos >= toRenderText(obj)->textLength()) {
-            obj = bidiNext(block, obj, resolver);
-            pos = 0;
-            nextBreakablePosition = -1;
-        }
-    } else {
-        obj = bidiNext(block, obj, resolver);
-        pos = 0;
-        nextBreakablePosition = -1;
-    }
-}
-
-template<>
-inline void InlineBidiResolver::increment()
-{
-    current.increment(this);
-}
-
-inline bool InlineIterator::atEnd() const
-{
-    return !obj;
-}
-
-inline UChar InlineIterator::current() const
-{
-    if (!obj || !obj->isText())
-        return 0;
-
-    RenderText* text = toRenderText(obj);
-    if (pos >= text->textLength())
-        return 0;
-
-    return text->characters()[pos];
-}
-
-ALWAYS_INLINE Direction InlineIterator::direction() const
-{
-    if (UChar c = current())
-        return Unicode::direction(c);
-
-    if (obj && obj->isListMarker())
-        return obj->style()->direction() == LTR ? LeftToRight : RightToLeft;
-
-    return OtherNeutral;
-}
-
-// -------------------------------------------------------------------------------------------------
-
-static void chopMidpointsAt(RenderObject* obj, unsigned pos)
-{
-    if (!sNumMidpoints)
-        return;
-    InlineIterator* midpoints = smidpoints->data();
-    for (int i = sNumMidpoints - 1; i >= 0; i--) {
-        const InlineIterator& point = midpoints[i];
-        if (point.obj == obj && point.pos == pos) {
-            sNumMidpoints = i;
-            break;
-        }
-    }
-}
-
-static void checkMidpoints(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 && sNumMidpoints && sNumMidpoints % 2 == 0) {
-        InlineIterator* midpoints = smidpoints->data();
-        InlineIterator& endpoint = midpoints[sNumMidpoints-2];
-        const InlineIterator& startpoint = midpoints[sNumMidpoints-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.
-            sNumMidpoints--;
-            if (endpoint.obj->style()->collapseWhiteSpace()) {
-                if (endpoint.obj->isText()) {
-                    // Don't shave a character off the endpoint if it was from a soft hyphen.
-                    RenderText* textObj = toRenderText(endpoint.obj);
-                    if (endpoint.pos + 1 < textObj->textLength()) {
-                        if (textObj->characters()[endpoint.pos+1] == softHyphen)
-                            return;
-                    } else if (startpoint.obj->isText()) {
-                        RenderText *startText = toRenderText(startpoint.obj);
-                        if (startText->textLength() && startText->characters()[0] == softHyphen)
-                            return;
-                    }
-                }
-                endpoint.pos--;
-            }
-        }
-    }    
-}
-
-static void addMidpoint(const InlineIterator& midpoint)
-{
-    if (smidpoints->size() <= sNumMidpoints)
-        smidpoints->grow(sNumMidpoints + 10);
-
-    InlineIterator* midpoints = smidpoints->data();
-    midpoints[sNumMidpoints++] = midpoint;
-}
-
-static void 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;
-
-    bool haveNextMidpoint = (sCurrMidpoint < sNumMidpoints);
-    InlineIterator nextMidpoint;
-    if (haveNextMidpoint)
-        nextMidpoint = smidpoints->at(sCurrMidpoint);
-    if (betweenMidpoints) {
-        if (!(haveNextMidpoint && nextMidpoint.obj == obj))
-            return;
-        // This is a new start point. Stop ignoring objects and 
-        // adjust our start.
-        betweenMidpoints = false;
-        start = nextMidpoint.pos;
-        sCurrMidpoint++;
-        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) {
-            betweenMidpoints = true;
-            sCurrMidpoint++;
-            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()));
-    }
-}
-
-template <>
-void InlineBidiResolver::appendRun()
-{
-    if (!emptyRun && !eor.atEnd()) {
-        int start = sor.pos;
-        RenderObject *obj = sor.obj;
-        while (obj && obj != eor.obj && obj != endOfLine.obj) {
-            appendRunsForObject(start, obj->length(), obj, *this);        
-            start = 0;
-            obj = bidiNext(sor.block, obj);
-        }
-        if (obj) {
-            unsigned pos = obj == eor.obj ? eor.pos : UINT_MAX;
-            if (obj == endOfLine.obj && endOfLine.pos <= pos) {
-                reachedEndOfLine = true;
-                pos = endOfLine.pos;
-            }
-            // It's OK to add runs for zero-length RenderObjects, just don't make the run larger than it should be
-            int end = obj->length() ? pos+1 : 0;
-            appendRunsForObject(start, end, obj, *this);
-        }
-        
-        eor.increment();
-        sor = eor;
-    }
-
-    m_direction = OtherNeutral;
-    m_status.eor = OtherNeutral;
-}
-
-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 = obj->createInlineBox(false, obj == this);
-            ASSERT(newBox->isInlineFlowBox());
-            parentBox = static_cast<InlineFlowBox*>(newBox);
-            parentBox->setFirstLineStyleBit(firstLine);
-            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);
-
-    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()->direction() == RTL) ? lastRun : firstRun)->m_object->isListMarker();
-
-        InlineBox* box = r->m_object->createInlineBox(r->m_object->isPositioned(), false, isOnlyRun);
-        r->m_box = box;
-
-        if (box) {
-            // 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->object() != 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);
-            }
-        }
-    }
-
-    // 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 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::computeHorizontalPositionsForLine(RootInlineBox* lineBox, bool firstLine, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd)
-{
-    // First determine our total width.
-    int availableWidth = lineWidth(height(), firstLine);
-    int totWidth = lineBox->getFlowSpacingWidth();
-    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]))
-                    totWidth += rt->style(firstLine)->font().wordSpacing();
-                needsWordSpacing = !isSpaceOrNewline(rt->characters()[r->m_stop - 1]) && r->m_stop == length;          
-            }
-            r->m_box->setWidth(rt->width(r->m_start, r->m_stop - r->m_start, totWidth, firstLine));
-        } else if (!r->m_object->isRenderInline()) {
-            RenderBox* renderBox = toRenderBox(r->m_object);
-            renderBox->calcWidth();
-            r->m_box->setWidth(renderBox->width());
-            totWidth += renderBox->marginLeft() + renderBox->marginRight();
-        }
-
-        totWidth += r->m_box->width();
-    }
-
-    // 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 x = leftOffset(height(), 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()->direction() == LTR) {
-                if (totWidth > availableWidth && trailingSpaceRun)
-                    trailingSpaceRun->m_box->setWidth(trailingSpaceRun->m_box->width() - totWidth + availableWidth);
-            } else {
-                if (trailingSpaceRun)
-                    trailingSpaceRun->m_box->setWidth(0);
-                else if (totWidth > availableWidth)
-                    x -= (totWidth - availableWidth);
-            }
-            break;
-        case JUSTIFY:
-            if (numSpaces && !reachedEnd && !lineBox->endsWithBreak()) {
-                if (trailingSpaceRun) {
-                    totWidth -= trailingSpaceRun->m_box->width();
-                    trailingSpaceRun->m_box->setWidth(0);
-                }
-                break;
-            }
-            // fall through
-        case TAAUTO:
-            numSpaces = 0;
-            // for right to left fall through to right aligned
-            if (style()->direction() == LTR) {
-                if (totWidth > availableWidth && trailingSpaceRun)
-                    trailingSpaceRun->m_box->setWidth(trailingSpaceRun->m_box->width() - totWidth + availableWidth);
-                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()->direction() == LTR) {
-                if (trailingSpaceRun) {
-                    totWidth -= trailingSpaceRun->m_box->width();
-                    trailingSpaceRun->m_box->setWidth(0);
-                }
-                if (totWidth < availableWidth)
-                    x += availableWidth - totWidth;
-            } else {
-                if (totWidth > availableWidth && trailingSpaceRun) {
-                    trailingSpaceRun->m_box->setWidth(trailingSpaceRun->m_box->width() - totWidth + availableWidth);
-                    totWidth -= trailingSpaceRun->m_box->width();
-                } else
-                    x += availableWidth - totWidth;
-            }
-            break;
-        case CENTER:
-        case WEBKIT_CENTER:
-            int trailingSpaceWidth = 0;
-            if (trailingSpaceRun) {
-                totWidth -= trailingSpaceRun->m_box->width();
-                trailingSpaceWidth = min(trailingSpaceRun->m_box->width(), (availableWidth - totWidth + 1) / 2);
-                trailingSpaceRun->m_box->setWidth(trailingSpaceWidth);
-            }
-            if (style()->direction() == LTR)
-                x += max((availableWidth - totWidth) / 2, 0);
-            else
-                x += totWidth > availableWidth ? (availableWidth - totWidth) : (availableWidth - totWidth) / 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 = (availableWidth - totWidth) * spaces / numSpaces;
-                    static_cast<InlineTextBox*>(r->m_box)->setSpaceAdd(spaceAdd);
-                    totWidth += 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).
-    int leftPosition = x;
-    int rightPosition = x;
-    needsWordSpacing = false;
-    lineBox->placeBoxesHorizontally(x, leftPosition, rightPosition, needsWordSpacing);
-    lineBox->setHorizontalOverflowPositions(leftPosition, rightPosition);
-}
-
-void RenderBlock::computeVerticalPositionsForLine(RootInlineBox* lineBox, BidiRun* firstRun)
-{
-    setHeight(lineBox->verticallyAlignBoxes(height()));
-    lineBox->setBlockHeight(height());
-
-    // See if the line spilled out.  If so set overflow height accordingly.
-    int bottomOfLine = lineBox->bottomOverflow();
-    if (bottomOfLine > height() && bottomOfLine > m_overflowHeight)
-        m_overflowHeight = bottomOfLine;
-
-    // Now make sure we place replaced render objects correctly.
-    for (BidiRun* r = firstRun; r; r = r->next()) {
-        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->setYPos(height());
-
-        // Position is used to properly position both replaced elements and
-        // to update the static normal flow x/y of positioned elements.
-        r->m_object->position(r->m_box);
-    }
-    // Positioned objects and zero-length text nodes destroy their boxes in
-    // position(), which unnecessarily dirties the line.
-    lineBox->markDirty(false);
-}
-
-// collects one line of the paragraph and transforms it to visual order
-void RenderBlock::bidiReorderLine(InlineBidiResolver& resolver, const InlineIterator& end)
-{
-    resolver.createBidiRunsForLine(end, style()->visuallyOrdered(), previousLineBrokeCleanly);
-}
-
-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& repaintTop, int& repaintBottom)
-{
-    bool useRepaintBounds = false;
-
-    invalidateVerticalPosition();
-    
-    m_overflowHeight = 0;
-        
-    setHeight(borderTop() + paddingTop());
-    int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();
-
-    // Figure out if we should clear out our line boxes.
-    // FIXME: Handle resize eventually!
-    // FIXME: Do something better when floats are present.
-    bool fullLayout = !firstLineBox() || !firstChild() || 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()) {
-        // layout replaced elements
-        bool endOfInline = false;
-        RenderObject* o = bidiFirst(this, 0, false);
-        Vector<FloatWithRect> floats;
-        int containerWidth = max(0, containingBlockWidth());
-        while (o) {
-            o->invalidateVerticalPosition();
-            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()->paddingLeft().isPercent() || o->style()->paddingRight().isPercent()))
-                    o->setPrefWidthsDirty(true, false);
-            
-                if (o->isPositioned())
-                    o->containingBlock()->insertPositionedObject(box);
-                else {
-                    if (o->isFloating())
-                        floats.append(FloatWithRect(box));
-                    else if (fullLayout || o->needsLayout()) // Replaced elements
-                        o->dirtyLineBoxes(fullLayout);
-
-                    o->layoutIfNeeded();
-                }
-            } else if (o->isText() || (o->isRenderInline() && !endOfInline)) {
-                if (fullLayout || o->selfNeedsLayout())
-                    o->dirtyLineBoxes(fullLayout);
-                
-                // Calculate margins of inline flows so that they can be used later by line layout.
-                if (o->isRenderInline())
-                    toRenderInline(o)->calcMargins(containerWidth);
-                o->setNeedsLayout(false);
-            }
-            o = bidiNext(this, o, 0, false, &endOfInline);
-        }
-
-        // We want to skip ahead to the first dirty line
-        InlineBidiResolver resolver;
-        unsigned floatIndex;
-        bool firstLine = true;
-        RootInlineBox* startLine = determineStartPosition(firstLine, fullLayout, resolver, floats, floatIndex);
-
-        if (fullLayout && !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;
-
-        if (!smidpoints)
-            smidpoints = new Vector<InlineIterator>();
-
-        sNumMidpoints = 0;
-        sCurrMidpoint = 0;
-
-        // 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 endLineYPos = 0;
-        RootInlineBox* endLine = (fullLayout || !startLine) ? 
-                                 0 : determineEndPosition(startLine, cleanLineStart, cleanLineBidiStatus, endLineYPos);
-
-        if (startLine) {
-            useRepaintBounds = true;
-            repaintTop = height();
-            repaintBottom = height();
-            RenderArena* arena = renderArena();
-            RootInlineBox* box = startLine;
-            while (box) {
-                repaintTop = min(repaintTop, box->topOverflow());
-                repaintBottom = max(repaintBottom, box->bottomOverflow());
-                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->object();
-                if (!lastObject->isBR())
-                    lastObject = lastRootBox()->firstLeafChild()->object();
-                if (lastObject->isBR()) {
-                    EClear clear = lastObject->style()->clear();
-                    if (clear != CNONE)
-                        newLine(clear);
-                }
-            }
-        }
-
-        bool endLineMatched = false;
-        bool checkForEndLineMatch = endLine;
-        bool checkForFloatsFromLastLine = false;
-        int lastHeight = height();
-
-        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, endLineYPos, repaintBottom, repaintTop)))
-                break;
-
-            betweenMidpoints = false;
-            isLineEmpty = true;
-            
-            EClear clear = CNONE;
-            end = findNextLineBreak(resolver, firstLine, &clear);
-            if (resolver.position().atEnd()) {
-                resolver.deleteRuns();
-                checkForFloatsFromLastLine = true;
-                break;
-            }
-            ASSERT(end != resolver.position());
-
-            if (!isLineEmpty) {
-                bidiReorderLine(resolver, end);
-                ASSERT(resolver.position() == end);
-
-                BidiRun* trailingSpaceRun = 0;
-                if (!previousLineBrokeCleanly && resolver.runCount() && resolver.logicallyLastRun()->m_object->style()->breakOnlyAfterWhiteSpace()) {
-                    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()) {
-                                ETextAlign textAlign = style()->textAlign();
-                                // If the trailing white space is at the right hand side of a left-aligned line, then computeHorizontalPositionsForLine()
-                                // does not care if trailingSpaceRun includes non-spaces at the beginning. In all other cases, trailingSpaceRun has to
-                                // contain only the spaces, either because we re-order them or because computeHorizontalPositionsForLine() needs to know
-                                // their width.
-                                bool shouldSeparateSpaces = textAlign != LEFT && textAlign != WEBKIT_LEFT && textAlign != TAAUTO || trailingSpaceRun->m_level % 2 || direction == RTL || shouldReorder;
-                                if (shouldSeparateSpaces) {
-                                    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;
-                if (resolver.runCount()) {
-                    lineBox = constructLine(resolver.runCount(), resolver.firstRun(), resolver.lastRun(), firstLine, !end.obj, end.obj && !end.pos ? end.obj : 0);
-                    if (lineBox) {
-                        lineBox->setEndsWithBreak(previousLineBrokeCleanly);
-
-                        // Now we position all of our text runs horizontally.
-                        computeHorizontalPositionsForLine(lineBox, firstLine, resolver.firstRun(), trailingSpaceRun, end.atEnd());
-
-                        // Now position our text runs vertically.
-                        computeVerticalPositionsForLine(lineBox, resolver.firstRun());
-
-#if ENABLE(SVG)
-                        // Special SVG text layout code
-                        lineBox->computePerCharacterLayoutInformation();
-#endif
-
-#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) {
-                        repaintTop = min(repaintTop, lineBox->topOverflow());
-                        repaintBottom = max(repaintBottom, lineBox->bottomOverflow());
-                    }
-                }
-
-                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()) {
-                    if (f->m_bottom > lastHeight)
-                        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 != IntRect(f->m_left, f->m_top, f->m_width, f->m_bottom - f->m_top))
-                        checkForEndLineMatch = false;
-                    floatIndex++;
-                }
-                lastFloat = m_floatingObjects->last();
-            }
-
-            lastHeight = height();
-            sNumMidpoints = 0;
-            sCurrMidpoint = 0;
-            resolver.setPosition(end);
-        }
-
-        if (endLine) {
-            if (endLineMatched) {
-                // Attach all the remaining lines, and then adjust their y-positions as needed.
-                int delta = height() - endLineYPos;
-                for (RootInlineBox* line = endLine; line; line = line->nextRootBox()) {
-                    line->attachLine();
-                    if (delta) {
-                        repaintTop = min(repaintTop, line->topOverflow() + min(delta, 0));
-                        repaintBottom = max(repaintBottom, line->bottomOverflow() + 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) {
-                            int floatTop = (*f)->y() - (*f)->marginTop();
-                            insertFloatingObject(*f);
-                            setHeight(floatTop + delta);
-                            positionNewFloats();
-                        }
-                    }
-                }
-                setHeight(lastRootBox()->blockHeight());
-            } else {
-                // Delete all the remaining lines.
-                InlineRunBox* line = endLine;
-                RenderArena* arena = renderArena();
-                while (line) {
-                    repaintTop = min(repaintTop, line->topOverflow());
-                    repaintBottom = max(repaintBottom, line->bottomOverflow());
-                    InlineRunBox* next = line->nextLineBox();
-                    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 (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()) {
-                if (f->m_bottom > lastHeight)
-                    lastRootBox()->floats().append(f->m_renderer);
-            }
-            lastFloat = m_floatingObjects->last();
-        }
-    }
-
-    sNumMidpoints = 0;
-    sCurrMidpoint = 0;
-
-    // Now add in the bottom border/padding.
-    setHeight(height() + toAdd);
-
-    // Always make sure this is at least our height.
-    m_overflowHeight = max(height(), m_overflowHeight);
-
-    // See if any lines spill out of the block.  If so, we need to update our overflow width.
-    checkLinesForOverflow();
-
-    if (!firstLineBox() && hasLineIfEmpty())
-        setHeight(height() + lineHeight(true, true));
-
-    // 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, InlineBidiResolver& resolver, Vector<FloatWithRect>& floats, unsigned& numCleanFloats)
-{
-    RootInlineBox* curr = 0;
-    RootInlineBox* last = 0;
-
-    bool dirtiedByFloat = false;
-    if (!fullLayout) {
-        size_t floatIndex = 0;
-        for (curr = firstRootBox(); curr && !curr->isDirty(); curr = curr->nextRootBox()) {
-            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;
-                    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 = floats[floatIndex].rect.y();
-                        curr->markDirty();
-                        markLinesDirtyInVerticalRange(curr->blockHeight(), floatTop + max(floats[floatIndex].rect.height(), newSize.height()));
-                        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 savedHeight = height();
-        // 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);
-                    setHeight((*f)->y() - (*f)->marginTop());
-                    positionNewFloats();
-                    ASSERT(floats[numCleanFloats].object == *f);
-                    numCleanFloats++;
-                }
-            }
-            line = line->nextRootBox();
-        }
-        setHeight(savedHeight);
-    }
-
-    firstLine = !last;
-    previousLineBrokeCleanly = !last || last->endsWithBreak();
-
-    RenderObject* startObj;
-    int pos = 0;
-    if (last) {
-        setHeight(last->blockHeight());
-        startObj = last->lineBreakObj();
-        pos = last->lineBreakPos();
-        resolver.setStatus(last->lineBreakBidiStatus());
-    } else {
-        bool ltr = style()->direction() == LTR
-    #if ENABLE(SVG)   
-            || (style()->unicodeBidi() == UBNormal && isSVGText())
-    #endif
-            ;
-
-        BidiContext* context = new BidiContext(ltr ? 0 : 1, ltr ? LeftToRight : RightToLeft, style()->unicodeBidi() == Override);
-
-        resolver.setLastStrongDir(context->dir());
-        resolver.setLastDir(context->dir());
-        resolver.setEorDir(context->dir());
-        resolver.setContext(context);
-        startObj = bidiFirst(this, &resolver);
-    }
-
-    resolver.setPosition(InlineIterator(this, startObj, pos));
-
-    return curr;
-}
-
-RootInlineBox* RenderBlock::determineEndPosition(RootInlineBox* startLine, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus, int& yPos)
-{
-    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();
-    yPos = prev->blockHeight();
-
-    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& endYPos, int& repaintBottom, int& repaintTop)
-{
-    if (resolver.position() == endLineStart) {
-        if (resolver.status() != endLineStatus)
-            return false;
-
-        int delta = height() - endYPos;
-        if (!delta || !m_floatingObjects)
-            return true;
-
-        // See if any floats end in the range along which we want to shift the lines vertically.
-        int top = min(height(), endYPos);
-
-        RootInlineBox* lastLine = endLine;
-        while (RootInlineBox* nextLine = lastLine->nextRootBox())
-            lastLine = nextLine;
-
-        int bottom = lastLine->blockHeight() + abs(delta);
-
-        for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {
-            if (f->m_bottom >= top && f->m_bottom < bottom)
-                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 yPos to be the block height of endLine.
-            if (result)
-                endYPos = line->blockHeight();
-
-            int delta = height() - endYPos;
-            if (delta && m_floatingObjects) {
-                // See if any floats end in the range along which we want to shift the lines vertically.
-                int top = min(height(), endYPos);
-
-                RootInlineBox* lastLine = endLine;
-                while (RootInlineBox* nextLine = lastLine->nextRootBox())
-                    lastLine = nextLine;
-
-                int bottom = lastLine->blockHeight() + abs(delta);
-
-                for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {
-                    if (f->m_bottom >= top && f->m_bottom < bottom)
-                        return false;
-                }
-            }
-
-            // Now delete the lines that we failed to sync.
-            RootInlineBox* boxToDelete = endLine;
-            RenderArena* arena = renderArena();
-            while (boxToDelete && boxToDelete != result) {
-                repaintTop = min(repaintTop, boxToDelete->topOverflow());
-                repaintBottom = max(repaintBottom, boxToDelete->bottomOverflow());
-                RootInlineBox* next = boxToDelete->nextRootBox();
-                boxToDelete->deleteLine(arena);
-                boxToDelete = next;
-            }
-
-            endLine = result;
-            return result;
-        }
-    }
-
-    return false;
-}
-
-static inline bool skipNonBreakingSpace(const InlineIterator& it)
-{
-    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)
-{
-    return style->collapseWhiteSpace() || (style->whiteSpace() == PRE_WRAP && (!isLineEmpty || !previousLineBrokeCleanly));
-}
-
-static inline bool shouldPreserveNewline(RenderObject* object)
-{
-#if ENABLE(SVG)
-    if (object->isSVGText())
-        return false;
-#endif
-
-    return object->style()->preserveNewline();
-}
-
-static bool inlineFlowRequiresLineBox(RenderBox* 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->isRenderInline() && !flow->firstChild() && flow->hasHorizontalBordersPaddingOrMargin();
-}
-
-static inline bool requiresLineBox(const InlineIterator& it)
-{
-    if (it.obj->isFloatingOrPositioned())
-        return false;
-
-    if (it.obj->isRenderInline() && !inlineFlowRequiresLineBox(toRenderBox(it.obj)))
-        return false;
-
-    if (!shouldCollapseWhiteSpace(it.obj->style()) || it.obj->isBR())
-        return true;
-
-    UChar current = it.current();
-    return current != ' ' && current != '\t' && current != softHyphen && (current != '\n' || shouldPreserveNewline(it.obj)) && !skipNonBreakingSpace(it);
-}
-
-bool RenderBlock::generatesLineBoxesForInlineChild(RenderObject* inlineObj)
-{
-    ASSERT(inlineObj->parent() == this);
-
-    InlineIterator it(this, inlineObj, 0);
-    while (!it.atEnd() && !requiresLineBox(it))
-        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)
-{
-    while (!iterator.atEnd() && !requiresLineBox(iterator)) {
-        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()->direction() == LTR ? leftOffset(height(), false) : rightOffset(height(), false));
-                toRenderInline(c)->layer()->setStaticY(height());
-            }
-    
-            RenderBox* box = toRenderBox(object);
-            if (box->style()->hasStaticX()) {
-                if (box->style()->isOriginalDisplayInlineType())
-                    box->layer()->setStaticX(style()->direction() == LTR ? leftOffset(height(), false) : width() - rightOffset(height(), false));
-                else
-                    box->layer()->setStaticX(style()->direction() == LTR ? borderLeft() + paddingLeft() : borderRight() + paddingRight());
-            }
-    
-            if (box->style()->hasStaticY())
-                box->layer()->setStaticY(height());
-        }
-        iterator.increment();
-    }
-}
-
-int RenderBlock::skipLeadingWhitespace(InlineBidiResolver& resolver, bool firstLine)
-{
-    int availableWidth = lineWidth(height(), firstLine);
-    while (!resolver.position().atEnd() && !requiresLineBox(resolver.position())) {
-        RenderObject* object = resolver.position().obj;
-        if (object->isFloating()) {
-            insertFloatingObject(toRenderBox(object));
-            positionNewFloats();
-            availableWidth = lineWidth(height(), 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()->direction() == LTR ? leftOffset(height(), firstLine) : rightOffset(height(), firstLine));
-                toRenderInline(c)->layer()->setStaticY(height());
-            }
-    
-            RenderBox* box = toRenderBox(object);
-            if (box->style()->hasStaticX()) {
-                if (object->style()->isOriginalDisplayInlineType())
-                    box->layer()->setStaticX(style()->direction() == LTR ? leftOffset(height(), firstLine) : width() - rightOffset(height(), firstLine));
-                else
-                    box->layer()->setStaticX(style()->direction() == LTR ? 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)
-{
-    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(InlineIterator(0, o, 0));
-            return true;
-        }
-    }
-
-    return false;
-}
-
-void RenderBlock::fitBelowFloats(int widthToFit, bool firstLine, int& availableWidth)
-{
-    ASSERT(widthToFit > availableWidth);
-
-    int floatBottom;
-    int lastFloatBottom = height();
-    int newLineWidth = availableWidth;
-    while (true) {
-        floatBottom = nextFloatBottomBelow(lastFloatBottom);
-        if (!floatBottom)
-            break;
-
-        newLineWidth = lineWidth(floatBottom, firstLine);
-        lastFloatBottom = floatBottom;
-        if (newLineWidth >= widthToFit)
-            break;
-    }
-
-    if (newLineWidth > availableWidth) {
-        setHeight(lastFloatBottom);
-        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));
-}
-
-InlineIterator RenderBlock::findNextLineBreak(InlineBidiResolver& resolver, bool firstLine, EClear* clear)
-{
-    ASSERT(resolver.position().block == this);
-
-    bool appliedStartWidth = resolver.position().pos > 0;
-
-    int width = skipLeadingWhitespace(resolver, firstLine);
-
-    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;
-
-    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 = !style()->htmlHacks() || !isTableCell() || !style()->width().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->isSVGText() ? 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);
-                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 && floatBox->width() + floatBox->marginLeft() + floatBox->marginRight() + w + tmpW <= width) {
-                    positionNewFloats();
-                    width = lineWidth(height(), 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()->direction() == LTR ?
-                                  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(ignoreStart); // Stop ignoring spaces.
-                        addMidpoint(ignoreStart); // Start ignoring again.
-                    }
-                    
-                }
-            }
-        } else if (o->isRenderInline()) {
-            // Right now, we should only encounter empty inlines here.
-            ASSERT(!o->firstChild());
-    
-            RenderBox* flowBox = toRenderBox(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(InlineIterator(0, o, 0)); // Stop ignoring spaces.
-                    addMidpoint(InlineIterator(0, o, 0)); // Start ignoring again.
-                } else if (style()->collapseWhiteSpace() && resolver.position().obj == o
-                    && shouldSkipWhitespaceAfterStartObject(this, o)) {
-                    // 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->marginLeft() + flowBox->borderLeft() + flowBox->paddingLeft() +
-                    flowBox->marginRight() + flowBox->borderRight() + flowBox->paddingRight();
-        } 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(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. -dwh
-            if (o->isListMarker() && !static_cast<RenderListMarker*>(o)->isInside()) {
-                if (style()->collapseWhiteSpace() && shouldSkipWhitespaceAfterStartObject(this, o)) {
-                    // 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;
-                }
-            } else
-                tmpW += replacedBox->width() + replacedBox->marginLeft() + replacedBox->marginRight() + inlineWidth(o);
-        } else if (o->isText()) {
-            if (!pos)
-                appliedStartWidth = false;
-
-            RenderText* t = toRenderText(o);
-
-            int strlen = t->textLength();
-            int len = strlen - pos;
-            const UChar* str = t->characters();
-
-            const Font& f = t->style(firstLine)->font();
-            bool isFixedPitch = f.isFixedPitch();
-
-            int lastSpace = pos;
-            int wordSpacing = o->style()->wordSpacing();
-            int lastSpaceWordSpacing = 0;
-
-            int wrapW = tmpW + inlineWidth(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;
-
-            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;
-                
-                // Check for soft hyphens.  Go ahead and ignore them.
-                if (c == softHyphen) {
-                    if (!ignoringSpaces) {
-                        // Ignore soft hyphens
-                        InlineIterator beforeSoftHyphen;
-                        if (pos)
-                            beforeSoftHyphen = InlineIterator(0, o, pos - 1);
-                        else
-                            beforeSoftHyphen = InlineIterator(0, last, last->isText() ? toRenderText(last)->textLength() - 1 : 0);
-                        // Two consecutive soft hyphens. Avoid overlapping midpoints.
-                        if (sNumMidpoints && smidpoints->at(sNumMidpoints - 1).obj == o && smidpoints->at(sNumMidpoints - 1).pos == pos)
-                            sNumMidpoints--;
-                        else
-                            addMidpoint(beforeSoftHyphen);
-
-                        // Add the width up to but not including the hyphen.
-                        tmpW += textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
-
-                        // For wrapping text only, include the hyphen.  We need to ensure it will fit
-                        // on the line if it shows when we break.
-                        if (autoWrap)
-                            tmpW += textWidth(t, pos, 1, f, w + tmpW, isFixedPitch, collapseWhiteSpace);
-
-                        InlineIterator afterSoftHyphen(0, o, pos);
-                        afterSoftHyphen.increment();
-                        addMidpoint(afterSoftHyphen);
-                    }
-
-                    pos++;
-                    len--;
-                    lastSpaceWordSpacing = 0;
-                    lastSpace = pos; // Cheesy hack to prevent adding in widths of the run twice.
-                    continue;
-                }
-                
-                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));
-    
-                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(InlineIterator(0, o, pos));
-                            stoppedIgnoringSpaces = true;
-                        } else {
-                            // Just keep ignoring these spaces.
-                            pos++;
-                            len--;
-                            continue;
-                        }
-                    }
-
-                    int additionalTmpW = textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
-                    tmpW += additionalTmpW;
-                    if (!appliedStartWidth) {
-                        tmpW += inlineWidth(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);
-                            }
-                        }
-                        if (lineWasTooWide || w + tmpW > width) {
-                            if (lBreak.obj && shouldPreserveNewline(lBreak.obj) && lBreak.obj->isText() && !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(InlineIterator(0, o, pos - 1)); // Stop
-                                    addMidpoint(InlineIterator(0, o, pos)); // Start
-                                }
-                                lBreak.increment();
-                                previousLineBrokeCleanly = true;
-                            }
-                            goto end; // Didn't fit. Jump to the end.
-                        } else {
-                            if (!betweenWords || (midWordBreak && !autoWrap))
-                                tmpW -= additionalTmpW;
-                            if (pos > 0 && str[pos-1] == softHyphen)
-                                // Subtract the width of the soft hyphen out since we fit on a line.
-                                tmpW -= textWidth(t, pos - 1, 1, f, w + tmpW, isFixedPitch, collapseWhiteSpace);
-                        }
-                    }
-
-                    if (c == '\n' && preserveNewline) {
-                        if (!stoppedIgnoringSpaces && pos > 0) {
-                            // We need to stop right before the newline and then start up again.
-                            addMidpoint(InlineIterator(0, o, pos - 1)); // Stop
-                            addMidpoint(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(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(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!
-            if (!ignoringSpaces)
-                tmpW += textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
-            tmpW += inlineWidth(o, !appliedStartWidth, true);
-        } 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() || static_cast<RenderListMarker*>(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->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) {
-            if (last != o && !last->isListMarker()) {
-                // better to break between object boundaries than in the middle of a word (except for list markers)
-                lBreak.obj = o;
-                lBreak.pos = 0;
-                lBreak.nextBreakablePosition = -1;
-            } else {
-                // 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(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 (sNumMidpoints%2==1) {
-            InlineIterator* midpoints = smidpoints->data();
-            midpoints[sNumMidpoints-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(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();
-    }
-
-    if (lBreak.obj && lBreak.pos >= 2 && lBreak.obj->isText()) {
-        // For soft hyphens on line breaks, we have to chop out the midpoints that made us
-        // ignore the hyphen so that it will render at the end of the line.
-        UChar c = toRenderText(lBreak.obj)->characters()[lBreak.pos-1];
-        if (c == softHyphen)
-            chopMidpointsAt(lBreak.obj, lBreak.pos-2);
-    }
-    
-    return lBreak;
-}
-
-void RenderBlock::checkLinesForOverflow()
-{
-    m_overflowWidth = width();
-    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
-        m_overflowLeft = min(curr->leftOverflow(), m_overflowLeft);
-        m_overflowTop = min(curr->topOverflow(), m_overflowTop);
-        m_overflowWidth = max(curr->rightOverflow(), m_overflowWidth);
-        m_overflowHeight = max(curr->bottomOverflow(), m_overflowHeight);
-    }
-}
-
-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()->direction() == LTR;
-    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
-        int blockEdge = ltr ? rightOffset(curr->yPos(), curr == firstRootBox()) : leftOffset(curr->yPos(), curr == firstRootBox());
-        int lineBoxEdge = ltr ? curr->xPos() + curr->width() : curr->xPos();
-        if ((ltr && lineBoxEdge > blockEdge) || (!ltr && lineBoxEdge < blockEdge)) {
-            // 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;
-            if (curr->canAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width))
-                curr->placeEllipsis(ellipsisStr, ltr, blockEdge, width);
-        }
-    }
-}
-
-}
-
+/*
+ * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004, 2006, 2007, 2008 Apple Inc. All right 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 "bidi.h"
+
+#include "CharacterNames.h"
+#include "Document.h"
+#include "Element.h"
+#include "FrameView.h"
+#include "InlineTextBox.h"
+#include "Logging.h"
+#include "RenderArena.h"
+#include "RenderInline.h"
+#include "RenderLayer.h"
+#include "RenderListMarker.h"
+#include "RenderView.h"
+#include "break_lines.h"
+#include <wtf/AlwaysInline.h>
+#include <wtf/RefCountedLeakCounter.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/Vector.h>
+
+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;
+
+class InlineIterator {
+public:
+    InlineIterator()
+        : block(0)
+        , obj(0)
+        , pos(0)
+        , nextBreakablePosition(-1)
+    {
+    }
+
+    InlineIterator(RenderBlock* b, RenderObject* o, unsigned p)
+        : block(b)
+        , obj(o)
+        , pos(p)
+        , nextBreakablePosition(-1)
+    {
+    }
+
+    void increment(InlineBidiResolver* resolver = 0);
+    bool atEnd() const;
+
+    UChar current() const;
+    WTF::Unicode::Direction direction() const;
+
+    RenderBlock* block;
+    RenderObject* obj;
+    unsigned pos;
+    int nextBreakablePosition;
+};
+
+// Midpoint globals.  The goal is not to do any allocation when dealing with
+// these midpoints, so we just keep an array around and never clear it.  We track
+// the number of items and position using the two other variables.
+static Vector<InlineIterator>* smidpoints;
+static unsigned sNumMidpoints;
+static unsigned sCurrMidpoint;
+static bool betweenMidpoints;
+
+static bool isLineEmpty = true;
+static bool previousLineBrokeCleanly = true;
+
+static int getBorderPaddingMargin(RenderBox* child, bool endOfInline)
+{
+    bool leftSide = (child->style()->direction() == LTR) ? !endOfInline : endOfInline;
+    if (leftSide)
+        return child->marginLeft() + child->paddingLeft() + child->borderLeft();
+    return child->marginRight() + child->paddingRight() + child->borderRight();
+}
+
+static int inlineWidth(RenderObject* child, bool start = true, bool end = true)
+{
+    unsigned lineDepth = 1;
+    int extraWidth = 0;
+    RenderObject* parent = child->parent();
+    while (parent->isBox() && parent->isInline() && !parent->isInlineBlockOrInlineTable() && lineDepth++ < cMaxLineDepth) {
+        if (start && !child->previousSibling())
+            extraWidth += getBorderPaddingMargin(toRenderBox(parent), false);
+        if (end && !child->nextSibling())
+            extraWidth += getBorderPaddingMargin(toRenderBox(parent), true);
+        child = parent;
+        parent = child->parent();
+    }
+    return extraWidth;
+}
+
+#ifndef NDEBUG
+static WTF::RefCountedLeakCounter bidiRunCounter("BidiRun");
+
+static bool inBidiRunDestroy;
+#endif
+
+void BidiRun::destroy()
+{
+#ifndef NDEBUG
+    inBidiRunDestroy = true;
+#endif
+    RenderArena* renderArena = m_object->renderArena();
+    delete this;
+#ifndef NDEBUG
+    inBidiRunDestroy = false;
+#endif
+
+    // Recover the size left there for us by operator delete and free the memory.
+    renderArena->free(*reinterpret_cast<size_t*>(this), this);
+}
+
+void* BidiRun::operator new(size_t sz, RenderArena* renderArena) throw()
+{
+#ifndef NDEBUG
+    bidiRunCounter.increment();
+#endif
+    return renderArena->allocate(sz);
+}
+
+void BidiRun::operator delete(void* ptr, size_t sz)
+{
+#ifndef NDEBUG
+    bidiRunCounter.decrement();
+#endif
+    ASSERT(inBidiRunDestroy);
+
+    // Stash size where destroy() can find it.
+    *(size_t*)ptr = sz;
+}
+
+// ---------------------------------------------------------------------
+
+inline bool operator==(const InlineIterator& it1, const InlineIterator& it2)
+{
+    return it1.pos == it2.pos && it1.obj == it2.obj;
+}
+
+inline bool operator!=(const InlineIterator& it1, const InlineIterator& it2)
+{
+    return it1.pos != it2.pos || it1.obj != it2.obj;
+}
+
+static inline RenderObject* bidiNext(RenderBlock* block, RenderObject* current, InlineBidiResolver* resolver = 0, bool skipInlines = true, bool* endOfInlinePtr = 0)
+{
+    RenderObject* next = 0;
+    bool oldEndOfInline = endOfInlinePtr ? *endOfInlinePtr : false;
+    bool endOfInline = false;
+
+    while (current) {
+        next = 0;
+        if (!oldEndOfInline && !current->isFloating() && !current->isReplaced() && !current->isPositioned() && !current->isText()) {
+            next = current->firstChild();
+            if (next && resolver && next->isRenderInline()) {
+                EUnicodeBidi ub = next->style()->unicodeBidi();
+                if (ub != UBNormal) {
+                    TextDirection dir = next->style()->direction();
+                    Direction d = (ub == Embed
+                        ? (dir == RTL ? RightToLeftEmbedding : LeftToRightEmbedding)
+                        : (dir == RTL ? RightToLeftOverride : LeftToRightOverride));
+                    resolver->embed(d);
+                }
+            }
+        }
+
+        if (!next) {
+            if (!skipInlines && !oldEndOfInline && current->isRenderInline()) {
+                next = current;
+                endOfInline = true;
+                break;
+            }
+
+            while (current && current != block) {
+                if (resolver && current->isRenderInline() && current->style()->unicodeBidi() != UBNormal)
+                    resolver->embed(PopDirectionalFormat);
+
+                next = current->nextSibling();
+                if (next) {
+                    if (resolver && next->isRenderInline()) {
+                        EUnicodeBidi ub = next->style()->unicodeBidi();
+                        if (ub != UBNormal) {
+                            TextDirection dir = next->style()->direction();
+                            Direction d = (ub == Embed
+                                ? (dir == RTL ? RightToLeftEmbedding: LeftToRightEmbedding)
+                                : (dir == RTL ? RightToLeftOverride : LeftToRightOverride));
+                            resolver->embed(d);
+                        }
+                    }
+                    break;
+                }
+                
+                current = current->parent();
+                if (!skipInlines && current && current != block && current->isRenderInline()) {
+                    next = current;
+                    endOfInline = true;
+                    break;
+                }
+            }
+        }
+
+        if (!next)
+            break;
+
+        if (next->isText() || next->isFloating() || next->isReplaced() || next->isPositioned()
+            || ((!skipInlines || !next->firstChild()) // Always return EMPTY inlines.
+                && next->isRenderInline()))
+            break;
+        current = next;
+    }
+
+    if (endOfInlinePtr)
+        *endOfInlinePtr = endOfInline;
+
+    return next;
+}
+
+static RenderObject* bidiFirst(RenderBlock* block, InlineBidiResolver* resolver, bool skipInlines = true)
+{
+    if (!block->firstChild())
+        return 0;
+    
+    RenderObject* o = block->firstChild();
+    if (o->isRenderInline()) {
+        if (resolver) {
+            EUnicodeBidi ub = o->style()->unicodeBidi();
+            if (ub != UBNormal) {
+                TextDirection dir = o->style()->direction();
+                Direction d = (ub == Embed
+                    ? (dir == RTL ? RightToLeftEmbedding : LeftToRightEmbedding)
+                    : (dir == RTL ? RightToLeftOverride : LeftToRightOverride));
+                resolver->embed(d);
+            }
+        }
+        if (skipInlines && o->firstChild())
+            o = bidiNext(block, o, resolver, skipInlines);
+        else {
+            // Never skip empty inlines.
+            if (resolver)
+                resolver->commitExplicitEmbedding();
+            return o; 
+        }
+    }
+
+    if (o && !o->isText() && !o->isReplaced() && !o->isFloating() && !o->isPositioned())
+        o = bidiNext(block, o, resolver, skipInlines);
+
+    if (resolver)
+        resolver->commitExplicitEmbedding();
+    return o;
+}
+
+inline void InlineIterator::increment(InlineBidiResolver* resolver)
+{
+    if (!obj)
+        return;
+    if (obj->isText()) {
+        pos++;
+        if (pos >= toRenderText(obj)->textLength()) {
+            obj = bidiNext(block, obj, resolver);
+            pos = 0;
+            nextBreakablePosition = -1;
+        }
+    } else {
+        obj = bidiNext(block, obj, resolver);
+        pos = 0;
+        nextBreakablePosition = -1;
+    }
+}
+
+template<>
+inline void InlineBidiResolver::increment()
+{
+    current.increment(this);
+}
+
+inline bool InlineIterator::atEnd() const
+{
+    return !obj;
+}
+
+inline UChar InlineIterator::current() const
+{
+    if (!obj || !obj->isText())
+        return 0;
+
+    RenderText* text = toRenderText(obj);
+    if (pos >= text->textLength())
+        return 0;
+
+    return text->characters()[pos];
+}
+
+ALWAYS_INLINE Direction InlineIterator::direction() const
+{
+    if (UChar c = current())
+        return Unicode::direction(c);
+
+    if (obj && obj->isListMarker())
+        return obj->style()->direction() == LTR ? LeftToRight : RightToLeft;
+
+    return OtherNeutral;
+}
+
+// -------------------------------------------------------------------------------------------------
+
+static void chopMidpointsAt(RenderObject* obj, unsigned pos)
+{
+    if (!sNumMidpoints)
+        return;
+    InlineIterator* midpoints = smidpoints->data();
+    for (int i = sNumMidpoints - 1; i >= 0; i--) {
+        const InlineIterator& point = midpoints[i];
+        if (point.obj == obj && point.pos == pos) {
+            sNumMidpoints = i;
+            break;
+        }
+    }
+}
+
+static void checkMidpoints(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 && sNumMidpoints && sNumMidpoints % 2 == 0) {
+        InlineIterator* midpoints = smidpoints->data();
+        InlineIterator& endpoint = midpoints[sNumMidpoints-2];
+        const InlineIterator& startpoint = midpoints[sNumMidpoints-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.
+            sNumMidpoints--;
+            if (endpoint.obj->style()->collapseWhiteSpace()) {
+                if (endpoint.obj->isText()) {
+                    // Don't shave a character off the endpoint if it was from a soft hyphen.
+                    RenderText* textObj = toRenderText(endpoint.obj);
+                    if (endpoint.pos + 1 < textObj->textLength()) {
+                        if (textObj->characters()[endpoint.pos+1] == softHyphen)
+                            return;
+                    } else if (startpoint.obj->isText()) {
+                        RenderText *startText = toRenderText(startpoint.obj);
+                        if (startText->textLength() && startText->characters()[0] == softHyphen)
+                            return;
+                    }
+                }
+                endpoint.pos--;
+            }
+        }
+    }    
+}
+
+static void addMidpoint(const InlineIterator& midpoint)
+{
+    if (smidpoints->size() <= sNumMidpoints)
+        smidpoints->grow(sNumMidpoints + 10);
+
+    InlineIterator* midpoints = smidpoints->data();
+    midpoints[sNumMidpoints++] = midpoint;
+}
+
+static void appendRunsForObject(int start, int end, RenderObject* obj, InlineBidiResolver& resolver)
+{
+    if (start > end || obj->isFloating() ||
+        (obj->isPositioned() && !obj->hasStaticX() && !obj->hasStaticY() && !obj->container()->isRenderInline()))
+        return;
+
+    bool haveNextMidpoint = (sCurrMidpoint < sNumMidpoints);
+    InlineIterator nextMidpoint;
+    if (haveNextMidpoint)
+        nextMidpoint = smidpoints->at(sCurrMidpoint);
+    if (betweenMidpoints) {
+        if (!(haveNextMidpoint && nextMidpoint.obj == obj))
+            return;
+        // This is a new start point. Stop ignoring objects and 
+        // adjust our start.
+        betweenMidpoints = false;
+        start = nextMidpoint.pos;
+        sCurrMidpoint++;
+        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) {
+            betweenMidpoints = true;
+            sCurrMidpoint++;
+            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()));
+    }
+}
+
+template <>
+void InlineBidiResolver::appendRun()
+{
+    if (!emptyRun && !eor.atEnd()) {
+        int start = sor.pos;
+        RenderObject *obj = sor.obj;
+        while (obj && obj != eor.obj && obj != endOfLine.obj) {
+            appendRunsForObject(start, obj->length(), obj, *this);        
+            start = 0;
+            obj = bidiNext(sor.block, obj);
+        }
+        if (obj) {
+            unsigned pos = obj == eor.obj ? eor.pos : UINT_MAX;
+            if (obj == endOfLine.obj && endOfLine.pos <= pos) {
+                reachedEndOfLine = true;
+                pos = endOfLine.pos;
+            }
+            // It's OK to add runs for zero-length RenderObjects, just don't make the run larger than it should be
+            int end = obj->length() ? pos+1 : 0;
+            appendRunsForObject(start, end, obj, *this);
+        }
+        
+        eor.increment();
+        sor = eor;
+    }
+
+    m_direction = OtherNeutral;
+    m_status.eor = OtherNeutral;
+}
+
+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 = obj->createInlineBox(false, obj == this);
+            ASSERT(newBox->isInlineFlowBox());
+            parentBox = static_cast<InlineFlowBox*>(newBox);
+            parentBox->setFirstLineStyleBit(firstLine);
+            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);
+
+    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()->direction() == RTL) ? lastRun : firstRun)->m_object->isListMarker();
+
+        InlineBox* box = r->m_object->createInlineBox(r->m_object->isPositioned(), false, isOnlyRun);
+        r->m_box = box;
+
+        if (box) {
+            // 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->object() != 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);
+            }
+        }
+    }
+
+    // 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 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::computeHorizontalPositionsForLine(RootInlineBox* lineBox, bool firstLine, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd)
+{
+    // First determine our total width.
+    int availableWidth = lineWidth(height(), firstLine);
+    int totWidth = lineBox->getFlowSpacingWidth();
+    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]))
+                    totWidth += rt->style(firstLine)->font().wordSpacing();
+                needsWordSpacing = !isSpaceOrNewline(rt->characters()[r->m_stop - 1]) && r->m_stop == length;          
+            }
+            r->m_box->setWidth(rt->width(r->m_start, r->m_stop - r->m_start, totWidth, firstLine));
+        } else if (!r->m_object->isRenderInline()) {
+            RenderBox* renderBox = toRenderBox(r->m_object);
+            renderBox->calcWidth();
+            r->m_box->setWidth(renderBox->width());
+            totWidth += renderBox->marginLeft() + renderBox->marginRight();
+        }
+
+        totWidth += r->m_box->width();
+    }
+
+    // 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 x = leftOffset(height(), 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()->direction() == LTR) {
+                if (totWidth > availableWidth && trailingSpaceRun)
+                    trailingSpaceRun->m_box->setWidth(trailingSpaceRun->m_box->width() - totWidth + availableWidth);
+            } else {
+                if (trailingSpaceRun)
+                    trailingSpaceRun->m_box->setWidth(0);
+                else if (totWidth > availableWidth)
+                    x -= (totWidth - availableWidth);
+            }
+            break;
+        case JUSTIFY:
+            if (numSpaces && !reachedEnd && !lineBox->endsWithBreak()) {
+                if (trailingSpaceRun) {
+                    totWidth -= trailingSpaceRun->m_box->width();
+                    trailingSpaceRun->m_box->setWidth(0);
+                }
+                break;
+            }
+            // fall through
+        case TAAUTO:
+            numSpaces = 0;
+            // for right to left fall through to right aligned
+            if (style()->direction() == LTR) {
+                if (totWidth > availableWidth && trailingSpaceRun)
+                    trailingSpaceRun->m_box->setWidth(trailingSpaceRun->m_box->width() - totWidth + availableWidth);
+                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()->direction() == LTR) {
+                if (trailingSpaceRun) {
+                    totWidth -= trailingSpaceRun->m_box->width();
+                    trailingSpaceRun->m_box->setWidth(0);
+                }
+                if (totWidth < availableWidth)
+                    x += availableWidth - totWidth;
+            } else {
+                if (totWidth > availableWidth && trailingSpaceRun) {
+                    trailingSpaceRun->m_box->setWidth(trailingSpaceRun->m_box->width() - totWidth + availableWidth);
+                    totWidth -= trailingSpaceRun->m_box->width();
+                } else
+                    x += availableWidth - totWidth;
+            }
+            break;
+        case CENTER:
+        case WEBKIT_CENTER:
+            int trailingSpaceWidth = 0;
+            if (trailingSpaceRun) {
+                totWidth -= trailingSpaceRun->m_box->width();
+                trailingSpaceWidth = min(trailingSpaceRun->m_box->width(), (availableWidth - totWidth + 1) / 2);
+                trailingSpaceRun->m_box->setWidth(trailingSpaceWidth);
+            }
+            if (style()->direction() == LTR)
+                x += max((availableWidth - totWidth) / 2, 0);
+            else
+                x += totWidth > availableWidth ? (availableWidth - totWidth) : (availableWidth - totWidth) / 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 = (availableWidth - totWidth) * spaces / numSpaces;
+                    static_cast<InlineTextBox*>(r->m_box)->setSpaceAdd(spaceAdd);
+                    totWidth += 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).
+    int leftPosition = x;
+    int rightPosition = x;
+    needsWordSpacing = false;
+    lineBox->placeBoxesHorizontally(x, leftPosition, rightPosition, needsWordSpacing);
+    lineBox->setHorizontalOverflowPositions(leftPosition, rightPosition);
+}
+
+void RenderBlock::computeVerticalPositionsForLine(RootInlineBox* lineBox, BidiRun* firstRun)
+{
+    setHeight(lineBox->verticallyAlignBoxes(height()));
+    lineBox->setBlockHeight(height());
+
+    // See if the line spilled out.  If so set overflow height accordingly.
+    int bottomOfLine = lineBox->bottomOverflow();
+    if (bottomOfLine > height() && bottomOfLine > m_overflowHeight)
+        m_overflowHeight = bottomOfLine;
+
+    // Now make sure we place replaced render objects correctly.
+    for (BidiRun* r = firstRun; r; r = r->next()) {
+        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->setYPos(height());
+
+        // Position is used to properly position both replaced elements and
+        // to update the static normal flow x/y of positioned elements.
+        r->m_object->position(r->m_box);
+    }
+    // Positioned objects and zero-length text nodes destroy their boxes in
+    // position(), which unnecessarily dirties the line.
+    lineBox->markDirty(false);
+}
+
+// collects one line of the paragraph and transforms it to visual order
+void RenderBlock::bidiReorderLine(InlineBidiResolver& resolver, const InlineIterator& end)
+{
+    resolver.createBidiRunsForLine(end, style()->visuallyOrdered(), previousLineBrokeCleanly);
+}
+
+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& repaintTop, int& repaintBottom)
+{
+    bool useRepaintBounds = false;
+
+    invalidateVerticalPosition();
+    
+    m_overflowHeight = 0;
+        
+    setHeight(borderTop() + paddingTop());
+    int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();
+
+    // Figure out if we should clear out our line boxes.
+    // FIXME: Handle resize eventually!
+    // FIXME: Do something better when floats are present.
+    bool fullLayout = !firstLineBox() || !firstChild() || 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()) {
+        // layout replaced elements
+        bool endOfInline = false;
+        RenderObject* o = bidiFirst(this, 0, false);
+        Vector<FloatWithRect> floats;
+        int containerWidth = max(0, containingBlockWidth());
+        while (o) {
+            o->invalidateVerticalPosition();
+            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()->paddingLeft().isPercent() || o->style()->paddingRight().isPercent()))
+                    o->setPrefWidthsDirty(true, false);
+            
+                if (o->isPositioned())
+                    o->containingBlock()->insertPositionedObject(box);
+                else {
+                    if (o->isFloating())
+                        floats.append(FloatWithRect(box));
+                    else if (fullLayout || o->needsLayout()) // Replaced elements
+                        o->dirtyLineBoxes(fullLayout);
+
+                    o->layoutIfNeeded();
+                }
+            } else if (o->isText() || (o->isRenderInline() && !endOfInline)) {
+                if (fullLayout || o->selfNeedsLayout())
+                    o->dirtyLineBoxes(fullLayout);
+                
+                // Calculate margins of inline flows so that they can be used later by line layout.
+                if (o->isRenderInline())
+                    toRenderInline(o)->calcMargins(containerWidth);
+                o->setNeedsLayout(false);
+            }
+            o = bidiNext(this, o, 0, false, &endOfInline);
+        }
+
+        // We want to skip ahead to the first dirty line
+        InlineBidiResolver resolver;
+        unsigned floatIndex;
+        bool firstLine = true;
+        RootInlineBox* startLine = determineStartPosition(firstLine, fullLayout, resolver, floats, floatIndex);
+
+        if (fullLayout && !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() && m_layer) {
+                // 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(), m_layer->repaintRect());
+            }
+        }
+
+        FloatingObject* lastFloat = m_floatingObjects ? m_floatingObjects->last() : 0;
+
+        if (!smidpoints)
+            smidpoints = new Vector<InlineIterator>();
+
+        sNumMidpoints = 0;
+        sCurrMidpoint = 0;
+
+        // 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 endLineYPos = 0;
+        RootInlineBox* endLine = (fullLayout || !startLine) ? 
+                                 0 : determineEndPosition(startLine, cleanLineStart, cleanLineBidiStatus, endLineYPos);
+
+        if (startLine) {
+            useRepaintBounds = true;
+            repaintTop = height();
+            repaintBottom = height();
+            RenderArena* arena = renderArena();
+            RootInlineBox* box = startLine;
+            while (box) {
+                repaintTop = min(repaintTop, box->topOverflow());
+                repaintBottom = max(repaintBottom, box->bottomOverflow());
+                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->object();
+                if (!lastObject->isBR())
+                    lastObject = lastRootBox()->firstLeafChild()->object();
+                if (lastObject->isBR()) {
+                    EClear clear = lastObject->style()->clear();
+                    if (clear != CNONE)
+                        newLine(clear);
+                }
+            }
+        }
+
+        bool endLineMatched = false;
+        bool checkForEndLineMatch = endLine;
+        bool checkForFloatsFromLastLine = false;
+        int lastHeight = height();
+
+        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, endLineYPos, repaintBottom, repaintTop)))
+                break;
+
+            betweenMidpoints = false;
+            isLineEmpty = true;
+            
+            EClear clear = CNONE;
+            end = findNextLineBreak(resolver, firstLine, &clear);
+            if (resolver.position().atEnd()) {
+                resolver.deleteRuns();
+                checkForFloatsFromLastLine = true;
+                break;
+            }
+            ASSERT(end != resolver.position());
+
+            if (!isLineEmpty) {
+                bidiReorderLine(resolver, end);
+                ASSERT(resolver.position() == end);
+
+                BidiRun* trailingSpaceRun = 0;
+                if (!previousLineBrokeCleanly && resolver.runCount() && resolver.logicallyLastRun()->m_object->style()->breakOnlyAfterWhiteSpace()) {
+                    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()) {
+                                ETextAlign textAlign = style()->textAlign();
+                                // If the trailing white space is at the right hand side of a left-aligned line, then computeHorizontalPositionsForLine()
+                                // does not care if trailingSpaceRun includes non-spaces at the beginning. In all other cases, trailingSpaceRun has to
+                                // contain only the spaces, either because we re-order them or because computeHorizontalPositionsForLine() needs to know
+                                // their width.
+                                bool shouldSeparateSpaces = textAlign != LEFT && textAlign != WEBKIT_LEFT && textAlign != TAAUTO || trailingSpaceRun->m_level % 2 || direction == RTL || shouldReorder;
+                                if (shouldSeparateSpaces) {
+                                    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;
+                if (resolver.runCount()) {
+                    lineBox = constructLine(resolver.runCount(), resolver.firstRun(), resolver.lastRun(), firstLine, !end.obj, end.obj && !end.pos ? end.obj : 0);
+                    if (lineBox) {
+                        lineBox->setEndsWithBreak(previousLineBrokeCleanly);
+
+                        // Now we position all of our text runs horizontally.
+                        computeHorizontalPositionsForLine(lineBox, firstLine, resolver.firstRun(), trailingSpaceRun, end.atEnd());
+
+                        // Now position our text runs vertically.
+                        computeVerticalPositionsForLine(lineBox, resolver.firstRun());
+
+#if ENABLE(SVG)
+                        // Special SVG text layout code
+                        lineBox->computePerCharacterLayoutInformation();
+#endif
+
+#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) {
+                        repaintTop = min(repaintTop, lineBox->topOverflow());
+                        repaintBottom = max(repaintBottom, lineBox->bottomOverflow());
+                    }
+                }
+
+                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()) {
+                    if (f->m_bottom > lastHeight)
+                        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 != IntRect(f->m_left, f->m_top, f->m_width, f->m_bottom - f->m_top))
+                        checkForEndLineMatch = false;
+                    floatIndex++;
+                }
+                lastFloat = m_floatingObjects->last();
+            }
+
+            lastHeight = height();
+            sNumMidpoints = 0;
+            sCurrMidpoint = 0;
+            resolver.setPosition(end);
+        }
+
+        if (endLine) {
+            if (endLineMatched) {
+                // Attach all the remaining lines, and then adjust their y-positions as needed.
+                int delta = height() - endLineYPos;
+                for (RootInlineBox* line = endLine; line; line = line->nextRootBox()) {
+                    line->attachLine();
+                    if (delta) {
+                        repaintTop = min(repaintTop, line->topOverflow() + min(delta, 0));
+                        repaintBottom = max(repaintBottom, line->bottomOverflow() + 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) {
+                            int floatTop = (*f)->y() - (*f)->marginTop();
+                            insertFloatingObject(*f);
+                            setHeight(floatTop + delta);
+                            positionNewFloats();
+                        }
+                    }
+                }
+                setHeight(lastRootBox()->blockHeight());
+            } else {
+                // Delete all the remaining lines.
+                InlineRunBox* line = endLine;
+                RenderArena* arena = renderArena();
+                while (line) {
+                    repaintTop = min(repaintTop, line->topOverflow());
+                    repaintBottom = max(repaintBottom, line->bottomOverflow());
+                    InlineRunBox* next = line->nextLineBox();
+                    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 (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()) {
+                if (f->m_bottom > lastHeight)
+                    lastRootBox()->floats().append(f->m_renderer);
+            }
+            lastFloat = m_floatingObjects->last();
+        }
+    }
+
+    sNumMidpoints = 0;
+    sCurrMidpoint = 0;
+
+    // Now add in the bottom border/padding.
+    setHeight(height() + toAdd);
+
+    // Always make sure this is at least our height.
+    m_overflowHeight = max(height(), m_overflowHeight);
+
+    // See if any lines spill out of the block.  If so, we need to update our overflow width.
+    checkLinesForOverflow();
+
+    if (!firstLineBox() && hasLineIfEmpty())
+        setHeight(height() + lineHeight(true, true));
+
+    // 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, InlineBidiResolver& resolver, Vector<FloatWithRect>& floats, unsigned& numCleanFloats)
+{
+    RootInlineBox* curr = 0;
+    RootInlineBox* last = 0;
+
+    bool dirtiedByFloat = false;
+    if (!fullLayout) {
+        size_t floatIndex = 0;
+        for (curr = firstRootBox(); curr && !curr->isDirty(); curr = curr->nextRootBox()) {
+            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;
+                    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 = floats[floatIndex].rect.y();
+                        curr->markDirty();
+                        markLinesDirtyInVerticalRange(curr->blockHeight(), floatTop + max(floats[floatIndex].rect.height(), newSize.height()));
+                        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 savedHeight = height();
+        // 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);
+                    setHeight((*f)->y() - (*f)->marginTop());
+                    positionNewFloats();
+                    ASSERT(floats[numCleanFloats].object == *f);
+                    numCleanFloats++;
+                }
+            }
+            line = line->nextRootBox();
+        }
+        setHeight(savedHeight);
+    }
+
+    firstLine = !last;
+    previousLineBrokeCleanly = !last || last->endsWithBreak();
+
+    RenderObject* startObj;
+    int pos = 0;
+    if (last) {
+        setHeight(last->blockHeight());
+        startObj = last->lineBreakObj();
+        pos = last->lineBreakPos();
+        resolver.setStatus(last->lineBreakBidiStatus());
+    } else {
+        bool ltr = style()->direction() == LTR
+    #if ENABLE(SVG)   
+            || (style()->unicodeBidi() == UBNormal && isSVGText())
+    #endif
+            ;
+
+        BidiContext* context = new BidiContext(ltr ? 0 : 1, ltr ? LeftToRight : RightToLeft, style()->unicodeBidi() == Override);
+
+        resolver.setLastStrongDir(context->dir());
+        resolver.setLastDir(context->dir());
+        resolver.setEorDir(context->dir());
+        resolver.setContext(context);
+        startObj = bidiFirst(this, &resolver);
+    }
+
+    resolver.setPosition(InlineIterator(this, startObj, pos));
+
+    return curr;
+}
+
+RootInlineBox* RenderBlock::determineEndPosition(RootInlineBox* startLine, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus, int& yPos)
+{
+    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();
+    yPos = prev->blockHeight();
+
+    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& endYPos, int& repaintBottom, int& repaintTop)
+{
+    if (resolver.position() == endLineStart) {
+        if (resolver.status() != endLineStatus)
+            return false;
+
+        int delta = height() - endYPos;
+        if (!delta || !m_floatingObjects)
+            return true;
+
+        // See if any floats end in the range along which we want to shift the lines vertically.
+        int top = min(height(), endYPos);
+
+        RootInlineBox* lastLine = endLine;
+        while (RootInlineBox* nextLine = lastLine->nextRootBox())
+            lastLine = nextLine;
+
+        int bottom = lastLine->blockHeight() + abs(delta);
+
+        for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {
+            if (f->m_bottom >= top && f->m_bottom < bottom)
+                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 yPos to be the block height of endLine.
+            if (result)
+                endYPos = line->blockHeight();
+
+            int delta = height() - endYPos;
+            if (delta && m_floatingObjects) {
+                // See if any floats end in the range along which we want to shift the lines vertically.
+                int top = min(height(), endYPos);
+
+                RootInlineBox* lastLine = endLine;
+                while (RootInlineBox* nextLine = lastLine->nextRootBox())
+                    lastLine = nextLine;
+
+                int bottom = lastLine->blockHeight() + abs(delta);
+
+                for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {
+                    if (f->m_bottom >= top && f->m_bottom < bottom)
+                        return false;
+                }
+            }
+
+            // Now delete the lines that we failed to sync.
+            RootInlineBox* boxToDelete = endLine;
+            RenderArena* arena = renderArena();
+            while (boxToDelete && boxToDelete != result) {
+                repaintTop = min(repaintTop, boxToDelete->topOverflow());
+                repaintBottom = max(repaintBottom, boxToDelete->bottomOverflow());
+                RootInlineBox* next = boxToDelete->nextRootBox();
+                boxToDelete->deleteLine(arena);
+                boxToDelete = next;
+            }
+
+            endLine = result;
+            return result;
+        }
+    }
+
+    return false;
+}
+
+static inline bool skipNonBreakingSpace(const InlineIterator& it)
+{
+    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)
+{
+    return style->collapseWhiteSpace() || (style->whiteSpace() == PRE_WRAP && (!isLineEmpty || !previousLineBrokeCleanly));
+}
+
+static inline bool shouldPreserveNewline(RenderObject* object)
+{
+#if ENABLE(SVG)
+    if (object->isSVGText())
+        return false;
+#endif
+
+    return object->style()->preserveNewline();
+}
+
+static bool inlineFlowRequiresLineBox(RenderBox* 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->isRenderInline() && !flow->firstChild() && flow->hasHorizontalBordersPaddingOrMargin();
+}
+
+static inline bool requiresLineBox(const InlineIterator& it)
+{
+    if (it.obj->isFloatingOrPositioned())
+        return false;
+
+    if (it.obj->isRenderInline() && !inlineFlowRequiresLineBox(toRenderBox(it.obj)))
+        return false;
+
+    if (!shouldCollapseWhiteSpace(it.obj->style()) || it.obj->isBR())
+        return true;
+
+    UChar current = it.current();
+    return current != ' ' && current != '\t' && current != softHyphen && (current != '\n' || shouldPreserveNewline(it.obj)) && !skipNonBreakingSpace(it);
+}
+
+bool RenderBlock::generatesLineBoxesForInlineChild(RenderObject* inlineObj)
+{
+    ASSERT(inlineObj->parent() == this);
+
+    InlineIterator it(this, inlineObj, 0);
+    while (!it.atEnd() && !requiresLineBox(it))
+        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)
+{
+    while (!iterator.atEnd() && !requiresLineBox(iterator)) {
+        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.
+                c->setStaticX(style()->direction() == LTR ? leftOffset(height(), false) : rightOffset(height(), false));
+                c->setStaticY(height());
+            }
+    
+            if (object->hasStaticX()) {
+                if (object->style()->isOriginalDisplayInlineType())
+                    object->setStaticX(style()->direction() == LTR ? leftOffset(height(), false) : width() - rightOffset(height(), false));
+                else
+                    object->setStaticX(style()->direction() == LTR ? borderLeft() + paddingLeft() : borderRight() + paddingRight());
+            }
+    
+            if (object->hasStaticY())
+                object->setStaticY(height());
+        }
+        iterator.increment();
+    }
+}
+
+int RenderBlock::skipLeadingWhitespace(InlineBidiResolver& resolver, bool firstLine)
+{
+    int availableWidth = lineWidth(height(), firstLine);
+    while (!resolver.position().atEnd() && !requiresLineBox(resolver.position())) {
+        RenderObject* object = resolver.position().obj;
+        if (object->isFloating()) {
+            insertFloatingObject(toRenderBox(object));
+            positionNewFloats();
+            availableWidth = lineWidth(height(), 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.
+                c->setStaticX(style()->direction() == LTR ? leftOffset(height(), firstLine) : rightOffset(height(), firstLine));
+                c->setStaticY(height());
+            }
+    
+            if (object->hasStaticX()) {
+                if (object->style()->isOriginalDisplayInlineType())
+                    object->setStaticX(style()->direction() == LTR ? leftOffset(height(), firstLine) : width() - rightOffset(height(), firstLine));
+                else
+                    object->setStaticX(style()->direction() == LTR ? borderLeft() + paddingLeft() : borderRight() + paddingRight());
+            }
+    
+            if (object->hasStaticY())
+                object->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)
+{
+    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(InlineIterator(0, o, 0));
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void RenderBlock::fitBelowFloats(int widthToFit, bool firstLine, int& availableWidth)
+{
+    ASSERT(widthToFit > availableWidth);
+
+    int floatBottom;
+    int lastFloatBottom = height();
+    int newLineWidth = availableWidth;
+    while (true) {
+        floatBottom = nextFloatBottomBelow(lastFloatBottom);
+        if (!floatBottom)
+            break;
+
+        newLineWidth = lineWidth(floatBottom, firstLine);
+        lastFloatBottom = floatBottom;
+        if (newLineWidth >= widthToFit)
+            break;
+    }
+
+    if (newLineWidth > availableWidth) {
+        setHeight(lastFloatBottom);
+        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));
+}
+
+InlineIterator RenderBlock::findNextLineBreak(InlineBidiResolver& resolver, bool firstLine, EClear* clear)
+{
+    ASSERT(resolver.position().block == this);
+
+    bool appliedStartWidth = resolver.position().pos > 0;
+
+    int width = skipLeadingWhitespace(resolver, firstLine);
+
+    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;
+
+    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 = !style()->htmlHacks() || !isTableCell() || !style()->width().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->isSVGText() ? 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);
+                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 && floatBox->width() + floatBox->marginLeft() + floatBox->marginRight() + w + tmpW <= width) {
+                    positionNewFloats();
+                    width = lineWidth(height(), 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.
+                bool isInlineType = o->style()->isOriginalDisplayInlineType();
+                bool needToSetStaticX = o->hasStaticX();
+                if (o->hasStaticX() && !isInlineType) {
+                    o->setStaticX(o->parent()->style()->direction() == LTR ?
+                                  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 = o->hasStaticY();
+                if (o->hasStaticY() && isInlineType) {
+                    o->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(ignoreStart); // Stop ignoring spaces.
+                        addMidpoint(ignoreStart); // Start ignoring again.
+                    }
+                    
+                }
+            }
+        } else if (o->isRenderInline()) {
+            // Right now, we should only encounter empty inlines here.
+            ASSERT(!o->firstChild());
+    
+            RenderBox* flowBox = toRenderBox(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(InlineIterator(0, o, 0)); // Stop ignoring spaces.
+                    addMidpoint(InlineIterator(0, o, 0)); // Start ignoring again.
+                } else if (style()->collapseWhiteSpace() && resolver.position().obj == o
+                    && shouldSkipWhitespaceAfterStartObject(this, o)) {
+                    // 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->marginLeft() + flowBox->borderLeft() + flowBox->paddingLeft() +
+                    flowBox->marginRight() + flowBox->borderRight() + flowBox->paddingRight();
+        } 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(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. -dwh
+            if (o->isListMarker() && !static_cast<RenderListMarker*>(o)->isInside()) {
+                if (style()->collapseWhiteSpace() && shouldSkipWhitespaceAfterStartObject(this, o)) {
+                    // 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;
+                }
+            } else
+                tmpW += replacedBox->width() + replacedBox->marginLeft() + replacedBox->marginRight() + inlineWidth(o);
+        } else if (o->isText()) {
+            if (!pos)
+                appliedStartWidth = false;
+
+            RenderText* t = toRenderText(o);
+
+            int strlen = t->textLength();
+            int len = strlen - pos;
+            const UChar* str = t->characters();
+
+            const Font& f = t->style(firstLine)->font();
+            bool isFixedPitch = f.isFixedPitch();
+
+            int lastSpace = pos;
+            int wordSpacing = o->style()->wordSpacing();
+            int lastSpaceWordSpacing = 0;
+
+            int wrapW = tmpW + inlineWidth(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;
+
+            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;
+                
+                // Check for soft hyphens.  Go ahead and ignore them.
+                if (c == softHyphen) {
+                    if (!ignoringSpaces) {
+                        // Ignore soft hyphens
+                        InlineIterator beforeSoftHyphen;
+                        if (pos)
+                            beforeSoftHyphen = InlineIterator(0, o, pos - 1);
+                        else
+                            beforeSoftHyphen = InlineIterator(0, last, last->isText() ? toRenderText(last)->textLength() - 1 : 0);
+                        // Two consecutive soft hyphens. Avoid overlapping midpoints.
+                        if (sNumMidpoints && smidpoints->at(sNumMidpoints - 1).obj == o && smidpoints->at(sNumMidpoints - 1).pos == pos)
+                            sNumMidpoints--;
+                        else
+                            addMidpoint(beforeSoftHyphen);
+
+                        // Add the width up to but not including the hyphen.
+                        tmpW += textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
+
+                        // For wrapping text only, include the hyphen.  We need to ensure it will fit
+                        // on the line if it shows when we break.
+                        if (autoWrap)
+                            tmpW += textWidth(t, pos, 1, f, w + tmpW, isFixedPitch, collapseWhiteSpace);
+
+                        InlineIterator afterSoftHyphen(0, o, pos);
+                        afterSoftHyphen.increment();
+                        addMidpoint(afterSoftHyphen);
+                    }
+
+                    pos++;
+                    len--;
+                    lastSpaceWordSpacing = 0;
+                    lastSpace = pos; // Cheesy hack to prevent adding in widths of the run twice.
+                    continue;
+                }
+                
+                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));
+    
+                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(InlineIterator(0, o, pos));
+                            stoppedIgnoringSpaces = true;
+                        } else {
+                            // Just keep ignoring these spaces.
+                            pos++;
+                            len--;
+                            continue;
+                        }
+                    }
+
+                    int additionalTmpW = textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
+                    tmpW += additionalTmpW;
+                    if (!appliedStartWidth) {
+                        tmpW += inlineWidth(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);
+                            }
+                        }
+                        if (lineWasTooWide || w + tmpW > width) {
+                            if (lBreak.obj && shouldPreserveNewline(lBreak.obj) && lBreak.obj->isText() && !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(InlineIterator(0, o, pos - 1)); // Stop
+                                    addMidpoint(InlineIterator(0, o, pos)); // Start
+                                }
+                                lBreak.increment();
+                                previousLineBrokeCleanly = true;
+                            }
+                            goto end; // Didn't fit. Jump to the end.
+                        } else {
+                            if (!betweenWords || (midWordBreak && !autoWrap))
+                                tmpW -= additionalTmpW;
+                            if (pos > 0 && str[pos-1] == softHyphen)
+                                // Subtract the width of the soft hyphen out since we fit on a line.
+                                tmpW -= textWidth(t, pos - 1, 1, f, w + tmpW, isFixedPitch, collapseWhiteSpace);
+                        }
+                    }
+
+                    if (c == '\n' && preserveNewline) {
+                        if (!stoppedIgnoringSpaces && pos > 0) {
+                            // We need to stop right before the newline and then start up again.
+                            addMidpoint(InlineIterator(0, o, pos - 1)); // Stop
+                            addMidpoint(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(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(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!
+            if (!ignoringSpaces)
+                tmpW += textWidth(t, lastSpace, pos - lastSpace, f, w + tmpW, isFixedPitch, collapseWhiteSpace) + lastSpaceWordSpacing;
+            tmpW += inlineWidth(o, !appliedStartWidth, true);
+        } 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() || static_cast<RenderListMarker*>(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->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) {
+            if (last != o && !last->isListMarker()) {
+                // better to break between object boundaries than in the middle of a word (except for list markers)
+                lBreak.obj = o;
+                lBreak.pos = 0;
+                lBreak.nextBreakablePosition = -1;
+            } else {
+                // 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(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 (sNumMidpoints%2==1) {
+            InlineIterator* midpoints = smidpoints->data();
+            midpoints[sNumMidpoints-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(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();
+    }
+
+    if (lBreak.obj && lBreak.pos >= 2 && lBreak.obj->isText()) {
+        // For soft hyphens on line breaks, we have to chop out the midpoints that made us
+        // ignore the hyphen so that it will render at the end of the line.
+        UChar c = toRenderText(lBreak.obj)->characters()[lBreak.pos-1];
+        if (c == softHyphen)
+            chopMidpointsAt(lBreak.obj, lBreak.pos-2);
+    }
+    
+    return lBreak;
+}
+
+void RenderBlock::checkLinesForOverflow()
+{
+    m_overflowWidth = width();
+    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
+        m_overflowLeft = min(curr->leftOverflow(), m_overflowLeft);
+        m_overflowTop = min(curr->topOverflow(), m_overflowTop);
+        m_overflowWidth = max(curr->rightOverflow(), m_overflowWidth);
+        m_overflowHeight = max(curr->bottomOverflow(), m_overflowHeight);
+    }
+}
+
+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()->direction() == LTR;
+    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
+        int blockEdge = ltr ? rightOffset(curr->yPos(), curr == firstRootBox()) : leftOffset(curr->yPos(), curr == firstRootBox());
+        int lineBoxEdge = ltr ? curr->xPos() + curr->width() : curr->xPos();
+        if ((ltr && lineBoxEdge > blockEdge) || (!ltr && lineBoxEdge < blockEdge)) {
+            // 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;
+            if (curr->canAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width))
+                curr->placeEllipsis(ellipsisStr, ltr, blockEdge, width);
+        }
+    }
+}
+
+}
+