Source/core/rendering/RootInlineBox.cpp

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This source file includes following definitions.
m_lineBottomWithLeading
destroy
detachEllipsisBox
rendererLineBoxes
clearTruncation
isHyphenated
baselinePosition
lineHeight
lineCanAccommodateEllipsis
placeEllipsis
placeEllipsisBox
paintEllipsisBox
paint
nodeAtPoint
adjustPosition
childRemoved
alignBoxesInBlockDirection
maxLogicalTop
beforeAnnotationsAdjustment
lineSelectionGap
selectionState
firstSelectedBox
lastSelectedBox
selectionTop
selectionTopAdjustedForPrecedingBlock
selectionBottom
blockDirectionPointInLine
block
isEditableLeaf
closestLeafChildForPoint
closestLeafChildForLogicalLeftPosition
lineBreakBidiStatus
setLineBreakInfo
ellipsisBox
removeLineBoxFromRenderObject
extractLineBoxFromRenderObject
attachLineBoxToRenderObject
paddedLayoutOverflowRect
setAscentAndDescent
ascentAndDescentForBox
verticalPositionForBox
includeLeadingForBox
includeFontForBox
includeGlyphsForBox
includeMarginForBox
fitsToGlyphs
includesRootLineBoxFontOrLeading
getLogicalStartBoxWithNode
getLogicalEndBoxWithNode
boxName
/*
 * Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "core/rendering/RootInlineBox.h"

#include "core/dom/Document.h"
#include "core/rendering/EllipsisBox.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/InlineTextBox.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderBlockFlow.h"
#include "core/rendering/RenderFlowThread.h"
#include "core/rendering/RenderInline.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/VerticalPositionCache.h"
#include "platform/text/BidiResolver.h"
#include "wtf/unicode/Unicode.h"

using namespace std;

namespace WebCore {

struct SameSizeAsRootInlineBox : public InlineFlowBox {
    unsigned variables[5];
    void* pointers[4];
};

COMPILE_ASSERT(sizeof(RootInlineBox) == sizeof(SameSizeAsRootInlineBox), RootInlineBox_should_stay_small);

typedef WTF::HashMap<const RootInlineBox*, EllipsisBox*> EllipsisBoxMap;
static EllipsisBoxMap* gEllipsisBoxMap = 0;

RootInlineBox::RootInlineBox(RenderBlockFlow& block)
    : InlineFlowBox(block)
    , m_lineBreakPos(0)
    , m_lineBreakObj(0)
    , m_lineTop(0)
    , m_lineBottom(0)
    , m_lineTopWithLeading(0)
    , m_lineBottomWithLeading(0)
{
    setIsHorizontal(block.isHorizontalWritingMode());
}


void RootInlineBox::destroy()
{
    detachEllipsisBox();
    InlineFlowBox::destroy();
}

void RootInlineBox::detachEllipsisBox()
{
    if (hasEllipsisBox()) {
        EllipsisBox* box = gEllipsisBoxMap->take(this);
        box->setParent(0);
        box->destroy();
        setHasEllipsisBox(false);
    }
}

RenderLineBoxList* RootInlineBox::rendererLineBoxes() const
{
    return block().lineBoxes();
}

void RootInlineBox::clearTruncation()
{
    if (hasEllipsisBox()) {
        detachEllipsisBox();
        InlineFlowBox::clearTruncation();
    }
}

bool RootInlineBox::isHyphenated() const
{
    for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) {
        if (box->isInlineTextBox()) {
            if (toInlineTextBox(box)->hasHyphen())
                return true;
        }
    }

    return false;
}

int RootInlineBox::baselinePosition(FontBaseline baselineType) const
{
    return boxModelObject()->baselinePosition(baselineType, isFirstLineStyle(), isHorizontal() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
}

LayoutUnit RootInlineBox::lineHeight() const
{
    return boxModelObject()->lineHeight(isFirstLineStyle(), isHorizontal() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
}

bool RootInlineBox::lineCanAccommodateEllipsis(bool ltr, int blockEdge, int lineBoxEdge, int ellipsisWidth)
{
    // First sanity-check the unoverflowed width of the whole line to see if there is sufficient room.
    int delta = ltr ? lineBoxEdge - blockEdge : blockEdge - lineBoxEdge;
    if (logicalWidth() - delta < ellipsisWidth)
        return false;

    // Next iterate over all the line boxes on the line.  If we find a replaced element that intersects
    // then we refuse to accommodate the ellipsis.  Otherwise we're ok.
    return InlineFlowBox::canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth);
}

float RootInlineBox::placeEllipsis(const AtomicString& ellipsisStr,  bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth,
                                  InlineBox* markupBox)
{
    // Create an ellipsis box.
    EllipsisBox* ellipsisBox = new EllipsisBox(renderer(), ellipsisStr, this,
        ellipsisWidth - (markupBox ? markupBox->logicalWidth() : 0), logicalHeight(),
        x(), y(), !prevRootBox(), isHorizontal(), markupBox);

    if (!gEllipsisBoxMap)
        gEllipsisBoxMap = new EllipsisBoxMap();
    gEllipsisBoxMap->add(this, ellipsisBox);
    setHasEllipsisBox(true);

    // FIXME: Do we need an RTL version of this?
    if (ltr && (logicalLeft() + logicalWidth() + ellipsisWidth) <= blockRightEdge) {
        ellipsisBox->setLogicalLeft(logicalLeft() + logicalWidth());
        return logicalWidth() + ellipsisWidth;
    }

    // Now attempt to find the nearest glyph horizontally and place just to the right (or left in RTL)
    // of that glyph.  Mark all of the objects that intersect the ellipsis box as not painting (as being
    // truncated).
    bool foundBox = false;
    float truncatedWidth = 0;
    float position = placeEllipsisBox(ltr, blockLeftEdge, blockRightEdge, ellipsisWidth, truncatedWidth, foundBox);
    ellipsisBox->setLogicalLeft(position);
    return truncatedWidth;
}

float RootInlineBox::placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox)
{
    float result = InlineFlowBox::placeEllipsisBox(ltr, blockLeftEdge, blockRightEdge, ellipsisWidth, truncatedWidth, foundBox);
    if (result == -1) {
        result = ltr ? blockRightEdge - ellipsisWidth : blockLeftEdge;
        truncatedWidth = blockRightEdge - blockLeftEdge;
    }
    return result;
}

void RootInlineBox::paintEllipsisBox(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom) const
{
    if (hasEllipsisBox() && paintInfo.shouldPaintWithinRoot(&renderer()) && renderer().style()->visibility() == VISIBLE
            && paintInfo.phase == PaintPhaseForeground)
        ellipsisBox()->paint(paintInfo, paintOffset, lineTop, lineBottom);
}

void RootInlineBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
{
    InlineFlowBox::paint(paintInfo, paintOffset, lineTop, lineBottom);
    paintEllipsisBox(paintInfo, paintOffset, lineTop, lineBottom);
}

bool RootInlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
{
    if (hasEllipsisBox() && visibleToHitTestRequest(request)) {
        if (ellipsisBox()->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom)) {
            renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
            return true;
        }
    }
    return InlineFlowBox::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom);
}

void RootInlineBox::adjustPosition(float dx, float dy)
{
    InlineFlowBox::adjustPosition(dx, dy);
    LayoutUnit blockDirectionDelta = isHorizontal() ? dy : dx; // The block direction delta is a LayoutUnit.
    m_lineTop += blockDirectionDelta;
    m_lineBottom += blockDirectionDelta;
    m_lineTopWithLeading += blockDirectionDelta;
    m_lineBottomWithLeading += blockDirectionDelta;
    if (hasEllipsisBox())
        ellipsisBox()->adjustPosition(dx, dy);
}

void RootInlineBox::childRemoved(InlineBox* box)
{
    if (&box->renderer() == m_lineBreakObj)
        setLineBreakInfo(0, 0, BidiStatus());

    for (RootInlineBox* prev = prevRootBox(); prev && prev->lineBreakObj() == &box->renderer(); prev = prev->prevRootBox()) {
        prev->setLineBreakInfo(0, 0, BidiStatus());
        prev->markDirty();
    }
}

LayoutUnit RootInlineBox::alignBoxesInBlockDirection(LayoutUnit heightOfBlock, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache)
{
    // SVG will handle vertical alignment on its own.
    if (isSVGRootInlineBox())
        return 0;

    LayoutUnit maxPositionTop = 0;
    LayoutUnit maxPositionBottom = 0;
    int maxAscent = 0;
    int maxDescent = 0;
    bool setMaxAscent = false;
    bool setMaxDescent = false;

    // Figure out if we're in no-quirks mode.
    bool noQuirksMode = renderer().document().inNoQuirksMode();

    m_baselineType = requiresIdeographicBaseline(textBoxDataMap) ? IdeographicBaseline : AlphabeticBaseline;

    computeLogicalBoxHeights(this, maxPositionTop, maxPositionBottom, maxAscent, maxDescent, setMaxAscent, setMaxDescent, noQuirksMode,
                             textBoxDataMap, baselineType(), verticalPositionCache);

    if (maxAscent + maxDescent < max(maxPositionTop, maxPositionBottom))
        adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);

    LayoutUnit maxHeight = maxAscent + maxDescent;
    LayoutUnit lineTop = heightOfBlock;
    LayoutUnit lineBottom = heightOfBlock;
    LayoutUnit lineTopIncludingMargins = heightOfBlock;
    LayoutUnit lineBottomIncludingMargins = heightOfBlock;
    bool setLineTop = false;
    bool hasAnnotationsBefore = false;
    bool hasAnnotationsAfter = false;
    placeBoxesInBlockDirection(heightOfBlock, maxHeight, maxAscent, noQuirksMode, lineTop, lineBottom, setLineTop,
                               lineTopIncludingMargins, lineBottomIncludingMargins, hasAnnotationsBefore, hasAnnotationsAfter, baselineType());
    m_hasAnnotationsBefore = hasAnnotationsBefore;
    m_hasAnnotationsAfter = hasAnnotationsAfter;

    maxHeight = max<LayoutUnit>(0, maxHeight); // FIXME: Is this really necessary?

    setLineTopBottomPositions(lineTop, lineBottom, heightOfBlock, heightOfBlock + maxHeight);
    if (block().view()->layoutState()->isPaginated())
        setPaginatedLineWidth(block().availableLogicalWidthForContent());

    LayoutUnit annotationsAdjustment = beforeAnnotationsAdjustment();
    if (annotationsAdjustment) {
        // FIXME: Need to handle pagination here. We might have to move to the next page/column as a result of the
        // ruby expansion.
        adjustBlockDirectionPosition(annotationsAdjustment.toFloat());
        heightOfBlock += annotationsAdjustment;
    }

    return heightOfBlock + maxHeight;
}

float RootInlineBox::maxLogicalTop() const
{
    float maxLogicalTop = 0;
    computeMaxLogicalTop(maxLogicalTop);
    return maxLogicalTop;
}

LayoutUnit RootInlineBox::beforeAnnotationsAdjustment() const
{
    LayoutUnit result = 0;

    if (!renderer().style()->isFlippedLinesWritingMode()) {
        // Annotations under the previous line may push us down.
        if (prevRootBox() && prevRootBox()->hasAnnotationsAfter())
            result = prevRootBox()->computeUnderAnnotationAdjustment(lineTop());

        if (!hasAnnotationsBefore())
            return result;

        // Annotations over this line may push us further down.
        LayoutUnit highestAllowedPosition = prevRootBox() ? min(prevRootBox()->lineBottom(), lineTop()) + result : static_cast<LayoutUnit>(block().borderBefore());
        result = computeOverAnnotationAdjustment(highestAllowedPosition);
    } else {
        // Annotations under this line may push us up.
        if (hasAnnotationsBefore())
            result = computeUnderAnnotationAdjustment(prevRootBox() ? prevRootBox()->lineBottom() : static_cast<LayoutUnit>(block().borderBefore()));

        if (!prevRootBox() || !prevRootBox()->hasAnnotationsAfter())
            return result;

        // We have to compute the expansion for annotations over the previous line to see how much we should move.
        LayoutUnit lowestAllowedPosition = max(prevRootBox()->lineBottom(), lineTop()) - result;
        result = prevRootBox()->computeOverAnnotationAdjustment(lowestAllowedPosition);
    }

    return result;
}

GapRects RootInlineBox::lineSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                                         LayoutUnit selTop, LayoutUnit selHeight, const PaintInfo* paintInfo)
{
    RenderObject::SelectionState lineState = selectionState();

    bool leftGap, rightGap;
    block().getSelectionGapInfo(lineState, leftGap, rightGap);

    GapRects result;

    InlineBox* firstBox = firstSelectedBox();
    InlineBox* lastBox = lastSelectedBox();
    if (leftGap) {
        result.uniteLeft(block().logicalLeftSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock,
            &firstBox->parent()->renderer(), firstBox->logicalLeft(), selTop, selHeight, paintInfo));
    }
    if (rightGap) {
        result.uniteRight(block().logicalRightSelectionGap(rootBlock, rootBlockPhysicalPosition, offsetFromRootBlock,
            &lastBox->parent()->renderer(), lastBox->logicalRight(), selTop, selHeight, paintInfo));
    }

    // When dealing with bidi text, a non-contiguous selection region is possible.
    // e.g. The logical text aaaAAAbbb (capitals denote RTL text and non-capitals LTR) is layed out
    // visually as 3 text runs |aaa|bbb|AAA| if we select 4 characters from the start of the text the
    // selection will look like (underline denotes selection):
    // |aaa|bbb|AAA|
    //  ___       _
    // We can see that the |bbb| run is not part of the selection while the runs around it are.
    if (firstBox && firstBox != lastBox) {
        // Now fill in any gaps on the line that occurred between two selected elements.
        LayoutUnit lastLogicalLeft = firstBox->logicalRight();
        bool isPreviousBoxSelected = firstBox->selectionState() != RenderObject::SelectionNone;
        for (InlineBox* box = firstBox->nextLeafChild(); box; box = box->nextLeafChild()) {
            if (box->selectionState() != RenderObject::SelectionNone) {
                LayoutRect logicalRect(lastLogicalLeft, selTop, box->logicalLeft() - lastLogicalLeft, selHeight);
                logicalRect.move(renderer().isHorizontalWritingMode() ? offsetFromRootBlock : LayoutSize(offsetFromRootBlock.height(), offsetFromRootBlock.width()));
                LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, logicalRect);
                if (isPreviousBoxSelected && gapRect.width() > 0 && gapRect.height() > 0) {
                    if (paintInfo && box->parent()->renderer().style()->visibility() == VISIBLE)
                        paintInfo->context->fillRect(gapRect, box->parent()->renderer().selectionBackgroundColor());
                    // VisibleSelection may be non-contiguous, see comment above.
                    result.uniteCenter(gapRect);
                }
                lastLogicalLeft = box->logicalRight();
            }
            if (box == lastBox)
                break;
            isPreviousBoxSelected = box->selectionState() != RenderObject::SelectionNone;
        }
    }

    return result;
}

RenderObject::SelectionState RootInlineBox::selectionState()
{
    // Walk over all of the selected boxes.
    RenderObject::SelectionState state = RenderObject::SelectionNone;
    for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) {
        RenderObject::SelectionState boxState = box->selectionState();
        if ((boxState == RenderObject::SelectionStart && state == RenderObject::SelectionEnd) ||
            (boxState == RenderObject::SelectionEnd && state == RenderObject::SelectionStart))
            state = RenderObject::SelectionBoth;
        else if (state == RenderObject::SelectionNone ||
                 ((boxState == RenderObject::SelectionStart || boxState == RenderObject::SelectionEnd) &&
                  (state == RenderObject::SelectionNone || state == RenderObject::SelectionInside)))
            state = boxState;
        else if (boxState == RenderObject::SelectionNone && state == RenderObject::SelectionStart) {
            // We are past the end of the selection.
            state = RenderObject::SelectionBoth;
        }
        if (state == RenderObject::SelectionBoth)
            break;
    }

    return state;
}

InlineBox* RootInlineBox::firstSelectedBox()
{
    for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) {
        if (box->selectionState() != RenderObject::SelectionNone)
            return box;
    }

    return 0;
}

InlineBox* RootInlineBox::lastSelectedBox()
{
    for (InlineBox* box = lastLeafChild(); box; box = box->prevLeafChild()) {
        if (box->selectionState() != RenderObject::SelectionNone)
            return box;
    }

    return 0;
}

LayoutUnit RootInlineBox::selectionTop() const
{
    LayoutUnit selectionTop = m_lineTop;

    if (m_hasAnnotationsBefore)
        selectionTop -= !renderer().style()->isFlippedLinesWritingMode() ? computeOverAnnotationAdjustment(m_lineTop) : computeUnderAnnotationAdjustment(m_lineTop);

    if (renderer().style()->isFlippedLinesWritingMode() || !prevRootBox())
        return selectionTop;

    LayoutUnit prevBottom = prevRootBox()->selectionBottom();
    if (prevBottom < selectionTop && block().containsFloats()) {
        // This line has actually been moved further down, probably from a large line-height, but possibly because the
        // line was forced to clear floats.  If so, let's check the offsets, and only be willing to use the previous
        // line's bottom if the offsets are greater on both sides.
        LayoutUnit prevLeft = block().logicalLeftOffsetForLine(prevBottom, false);
        LayoutUnit prevRight = block().logicalRightOffsetForLine(prevBottom, false);
        LayoutUnit newLeft = block().logicalLeftOffsetForLine(selectionTop, false);
        LayoutUnit newRight = block().logicalRightOffsetForLine(selectionTop, false);
        if (prevLeft > newLeft || prevRight < newRight)
            return selectionTop;
    }

    return prevBottom;
}

LayoutUnit RootInlineBox::selectionTopAdjustedForPrecedingBlock() const
{
    LayoutUnit top = selectionTop();

    RenderObject::SelectionState blockSelectionState = root().block().selectionState();
    if (blockSelectionState != RenderObject::SelectionInside && blockSelectionState != RenderObject::SelectionEnd)
        return top;

    LayoutSize offsetToBlockBefore;
    if (RenderBlock* block = root().block().blockBeforeWithinSelectionRoot(offsetToBlockBefore)) {
        if (RootInlineBox* lastLine = block->lastRootBox()) {
            RenderObject::SelectionState lastLineSelectionState = lastLine->selectionState();
            if (lastLineSelectionState != RenderObject::SelectionInside && lastLineSelectionState != RenderObject::SelectionStart)
                return top;

            LayoutUnit lastLineSelectionBottom = lastLine->selectionBottom() + offsetToBlockBefore.height();
            top = max(top, lastLineSelectionBottom);
        }
    }

    return top;
}

LayoutUnit RootInlineBox::selectionBottom() const
{
    LayoutUnit selectionBottom = m_lineBottom;

    if (m_hasAnnotationsAfter)
        selectionBottom += !renderer().style()->isFlippedLinesWritingMode() ? computeUnderAnnotationAdjustment(m_lineBottom) : computeOverAnnotationAdjustment(m_lineBottom);

    if (!renderer().style()->isFlippedLinesWritingMode() || !nextRootBox())
        return selectionBottom;

    LayoutUnit nextTop = nextRootBox()->selectionTop();
    if (nextTop > selectionBottom && block().containsFloats()) {
        // The next line has actually been moved further over, probably from a large line-height, but possibly because the
        // line was forced to clear floats.  If so, let's check the offsets, and only be willing to use the next
        // line's top if the offsets are greater on both sides.
        LayoutUnit nextLeft = block().logicalLeftOffsetForLine(nextTop, false);
        LayoutUnit nextRight = block().logicalRightOffsetForLine(nextTop, false);
        LayoutUnit newLeft = block().logicalLeftOffsetForLine(selectionBottom, false);
        LayoutUnit newRight = block().logicalRightOffsetForLine(selectionBottom, false);
        if (nextLeft > newLeft || nextRight < newRight)
            return selectionBottom;
    }

    return nextTop;
}

int RootInlineBox::blockDirectionPointInLine() const
{
    return !block().style()->isFlippedBlocksWritingMode() ? max(lineTop(), selectionTop()) : min(lineBottom(), selectionBottom());
}

RenderBlockFlow& RootInlineBox::block() const
{
    return toRenderBlockFlow(renderer());
}

static bool isEditableLeaf(InlineBox* leaf)
{
    return leaf && leaf->renderer().node() && leaf->renderer().node()->rendererIsEditable();
}

InlineBox* RootInlineBox::closestLeafChildForPoint(const IntPoint& pointInContents, bool onlyEditableLeaves)
{
    return closestLeafChildForLogicalLeftPosition(block().isHorizontalWritingMode() ? pointInContents.x() : pointInContents.y(), onlyEditableLeaves);
}

InlineBox* RootInlineBox::closestLeafChildForLogicalLeftPosition(int leftPosition, bool onlyEditableLeaves)
{
    InlineBox* firstLeaf = firstLeafChild();
    InlineBox* lastLeaf = lastLeafChild();

    if (firstLeaf != lastLeaf) {
        if (firstLeaf->isLineBreak())
            firstLeaf = firstLeaf->nextLeafChildIgnoringLineBreak();
        else if (lastLeaf->isLineBreak())
            lastLeaf = lastLeaf->prevLeafChildIgnoringLineBreak();
    }

    if (firstLeaf == lastLeaf && (!onlyEditableLeaves || isEditableLeaf(firstLeaf)))
        return firstLeaf;

    // Avoid returning a list marker when possible.
    if (leftPosition <= firstLeaf->logicalLeft() && !firstLeaf->renderer().isListMarker() && (!onlyEditableLeaves || isEditableLeaf(firstLeaf)))
        // The leftPosition coordinate is less or equal to left edge of the firstLeaf.
        // Return it.
        return firstLeaf;

    if (leftPosition >= lastLeaf->logicalRight() && !lastLeaf->renderer().isListMarker() && (!onlyEditableLeaves || isEditableLeaf(lastLeaf)))
        // The leftPosition coordinate is greater or equal to right edge of the lastLeaf.
        // Return it.
        return lastLeaf;

    InlineBox* closestLeaf = 0;
    for (InlineBox* leaf = firstLeaf; leaf; leaf = leaf->nextLeafChildIgnoringLineBreak()) {
        if (!leaf->renderer().isListMarker() && (!onlyEditableLeaves || isEditableLeaf(leaf))) {
            closestLeaf = leaf;
            if (leftPosition < leaf->logicalRight())
                // The x coordinate is less than the right edge of the box.
                // Return it.
                return leaf;
        }
    }

    return closestLeaf ? closestLeaf : lastLeaf;
}

BidiStatus RootInlineBox::lineBreakBidiStatus() const
{
    return BidiStatus(static_cast<WTF::Unicode::Direction>(m_lineBreakBidiStatusEor), static_cast<WTF::Unicode::Direction>(m_lineBreakBidiStatusLastStrong), static_cast<WTF::Unicode::Direction>(m_lineBreakBidiStatusLast), m_lineBreakContext);
}

void RootInlineBox::setLineBreakInfo(RenderObject* obj, unsigned breakPos, const BidiStatus& status)
{
    // When setting lineBreakObj, the RenderObject must not be a RenderInline
    // with no line boxes, otherwise all sorts of invariants are broken later.
    // This has security implications because if the RenderObject does not
    // point to at least one line box, then that RenderInline can be deleted
    // later without resetting the lineBreakObj, leading to use-after-free.
    ASSERT_WITH_SECURITY_IMPLICATION(!obj || obj->isText() || !(obj->isRenderInline() && obj->isBox() && !toRenderBox(obj)->inlineBoxWrapper()));

    m_lineBreakObj = obj;
    m_lineBreakPos = breakPos;
    m_lineBreakBidiStatusEor = status.eor;
    m_lineBreakBidiStatusLastStrong = status.lastStrong;
    m_lineBreakBidiStatusLast = status.last;
    m_lineBreakContext = status.context;
}

EllipsisBox* RootInlineBox::ellipsisBox() const
{
    if (!hasEllipsisBox())
        return 0;
    return gEllipsisBoxMap->get(this);
}

void RootInlineBox::removeLineBoxFromRenderObject()
{
    block().lineBoxes()->removeLineBox(this);
}

void RootInlineBox::extractLineBoxFromRenderObject()
{
    block().lineBoxes()->extractLineBox(this);
}

void RootInlineBox::attachLineBoxToRenderObject()
{
    block().lineBoxes()->attachLineBox(this);
}

LayoutRect RootInlineBox::paddedLayoutOverflowRect(LayoutUnit endPadding) const
{
    LayoutRect lineLayoutOverflow = layoutOverflowRect(lineTop(), lineBottom());
    if (!endPadding)
        return lineLayoutOverflow;

    if (isHorizontal()) {
        if (isLeftToRightDirection())
            lineLayoutOverflow.shiftMaxXEdgeTo(max<LayoutUnit>(lineLayoutOverflow.maxX(), logicalRight() + endPadding));
        else
            lineLayoutOverflow.shiftXEdgeTo(min<LayoutUnit>(lineLayoutOverflow.x(), logicalLeft() - endPadding));
    } else {
        if (isLeftToRightDirection())
            lineLayoutOverflow.shiftMaxYEdgeTo(max<LayoutUnit>(lineLayoutOverflow.maxY(), logicalRight() + endPadding));
        else
            lineLayoutOverflow.shiftYEdgeTo(min<LayoutUnit>(lineLayoutOverflow.y(), logicalLeft() - endPadding));
    }

    return lineLayoutOverflow;
}

static void setAscentAndDescent(int& ascent, int& descent, int newAscent, int newDescent, bool& ascentDescentSet)
{
    if (!ascentDescentSet) {
        ascentDescentSet = true;
        ascent = newAscent;
        descent = newDescent;
    } else {
        ascent = max(ascent, newAscent);
        descent = max(descent, newDescent);
    }
}

void RootInlineBox::ascentAndDescentForBox(InlineBox* box, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, int& ascent, int& descent,
                                           bool& affectsAscent, bool& affectsDescent) const
{
    bool ascentDescentSet = false;

    // Replaced boxes will return 0 for the line-height if line-box-contain says they are
    // not to be included.
    if (box->renderer().isReplaced()) {
        if (renderer().style(isFirstLineStyle())->lineBoxContain() & LineBoxContainReplaced) {
            ascent = box->baselinePosition(baselineType());
            descent = box->lineHeight() - ascent;

            // Replaced elements always affect both the ascent and descent.
            affectsAscent = true;
            affectsDescent = true;
        }
        return;
    }

    Vector<const SimpleFontData*>* usedFonts = 0;
    GlyphOverflow* glyphOverflow = 0;
    if (box->isText()) {
        GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(toInlineTextBox(box));
        usedFonts = it == textBoxDataMap.end() ? 0 : &it->value.first;
        glyphOverflow = it == textBoxDataMap.end() ? 0 : &it->value.second;
    }

    bool includeLeading = includeLeadingForBox(box);
    bool includeFont = includeFontForBox(box);

    bool setUsedFont = false;
    bool setUsedFontWithLeading = false;

    if (usedFonts && !usedFonts->isEmpty() && (includeFont || (box->renderer().style(isFirstLineStyle())->lineHeight().isNegative() && includeLeading))) {
        usedFonts->append(box->renderer().style(isFirstLineStyle())->font().primaryFont());
        for (size_t i = 0; i < usedFonts->size(); ++i) {
            const FontMetrics& fontMetrics = usedFonts->at(i)->fontMetrics();
            int usedFontAscent = fontMetrics.ascent(baselineType());
            int usedFontDescent = fontMetrics.descent(baselineType());
            int halfLeading = (fontMetrics.lineSpacing() - fontMetrics.height()) / 2;
            int usedFontAscentAndLeading = usedFontAscent + halfLeading;
            int usedFontDescentAndLeading = fontMetrics.lineSpacing() - usedFontAscentAndLeading;
            if (includeFont) {
                setAscentAndDescent(ascent, descent, usedFontAscent, usedFontDescent, ascentDescentSet);
                setUsedFont = true;
            }
            if (includeLeading) {
                setAscentAndDescent(ascent, descent, usedFontAscentAndLeading, usedFontDescentAndLeading, ascentDescentSet);
                setUsedFontWithLeading = true;
            }
            if (!affectsAscent)
                affectsAscent = usedFontAscent - box->logicalTop() > 0;
            if (!affectsDescent)
                affectsDescent = usedFontDescent + box->logicalTop() > 0;
        }
    }

    // If leading is included for the box, then we compute that box.
    if (includeLeading && !setUsedFontWithLeading) {
        int ascentWithLeading = box->baselinePosition(baselineType());
        int descentWithLeading = box->lineHeight() - ascentWithLeading;
        setAscentAndDescent(ascent, descent, ascentWithLeading, descentWithLeading, ascentDescentSet);

        // Examine the font box for inline flows and text boxes to see if any part of it is above the baseline.
        // If the top of our font box relative to the root box baseline is above the root box baseline, then
        // we are contributing to the maxAscent value. Descent is similar. If any part of our font box is below
        // the root box's baseline, then we contribute to the maxDescent value.
        affectsAscent = ascentWithLeading - box->logicalTop() > 0;
        affectsDescent = descentWithLeading + box->logicalTop() > 0;
    }

    if (includeFontForBox(box) && !setUsedFont) {
        int fontAscent = box->renderer().style(isFirstLineStyle())->fontMetrics().ascent(baselineType());
        int fontDescent = box->renderer().style(isFirstLineStyle())->fontMetrics().descent(baselineType());
        setAscentAndDescent(ascent, descent, fontAscent, fontDescent, ascentDescentSet);
        affectsAscent = fontAscent - box->logicalTop() > 0;
        affectsDescent = fontDescent + box->logicalTop() > 0;
    }

    if (includeGlyphsForBox(box) && glyphOverflow && glyphOverflow->computeBounds) {
        setAscentAndDescent(ascent, descent, glyphOverflow->top, glyphOverflow->bottom, ascentDescentSet);
        affectsAscent = glyphOverflow->top - box->logicalTop() > 0;
        affectsDescent = glyphOverflow->bottom + box->logicalTop() > 0;
        glyphOverflow->top = min(glyphOverflow->top, max(0, glyphOverflow->top - box->renderer().style(isFirstLineStyle())->fontMetrics().ascent(baselineType())));
        glyphOverflow->bottom = min(glyphOverflow->bottom, max(0, glyphOverflow->bottom - box->renderer().style(isFirstLineStyle())->fontMetrics().descent(baselineType())));
    }

    if (includeMarginForBox(box)) {
        LayoutUnit ascentWithMargin = box->renderer().style(isFirstLineStyle())->fontMetrics().ascent(baselineType());
        LayoutUnit descentWithMargin = box->renderer().style(isFirstLineStyle())->fontMetrics().descent(baselineType());
        if (box->parent() && !box->renderer().isText()) {
            ascentWithMargin += box->boxModelObject()->borderBefore() + box->boxModelObject()->paddingBefore() + box->boxModelObject()->marginBefore();
            descentWithMargin += box->boxModelObject()->borderAfter() + box->boxModelObject()->paddingAfter() + box->boxModelObject()->marginAfter();
        }
        setAscentAndDescent(ascent, descent, ascentWithMargin, descentWithMargin, ascentDescentSet);

        // Treat like a replaced element, since we're using the margin box.
        affectsAscent = true;
        affectsDescent = true;
    }
}

LayoutUnit RootInlineBox::verticalPositionForBox(InlineBox* box, VerticalPositionCache& verticalPositionCache)
{
    if (box->renderer().isText())
        return box->parent()->logicalTop();

    RenderBoxModelObject* renderer = box->boxModelObject();
    ASSERT(renderer->isInline());
    if (!renderer->isInline())
        return 0;

    // This method determines the vertical position for inline elements.
    bool firstLine = isFirstLineStyle();
    if (firstLine && !renderer->document().styleEngine()->usesFirstLineRules())
        firstLine = false;

    // Check the cache.
    bool isRenderInline = renderer->isRenderInline();
    if (isRenderInline && !firstLine) {
        LayoutUnit verticalPosition = verticalPositionCache.get(renderer, baselineType());
        if (verticalPosition != PositionUndefined)
            return verticalPosition;
    }

    LayoutUnit verticalPosition = 0;
    EVerticalAlign verticalAlign = renderer->style()->verticalAlign();
    if (verticalAlign == TOP || verticalAlign == BOTTOM)
        return 0;

    RenderObject* parent = renderer->parent();
    if (parent->isRenderInline() && parent->style()->verticalAlign() != TOP && parent->style()->verticalAlign() != BOTTOM)
        verticalPosition = box->parent()->logicalTop();

    if (verticalAlign != BASELINE) {
        const Font& font = parent->style(firstLine)->font();
        const FontMetrics& fontMetrics = font.fontMetrics();
        int fontSize = font.fontDescription().computedPixelSize();

        LineDirectionMode lineDirection = parent->isHorizontalWritingMode() ? HorizontalLine : VerticalLine;

        if (verticalAlign == SUB)
            verticalPosition += fontSize / 5 + 1;
        else if (verticalAlign == SUPER)
            verticalPosition -= fontSize / 3 + 1;
        else if (verticalAlign == TEXT_TOP)
            verticalPosition += renderer->baselinePosition(baselineType(), firstLine, lineDirection) - fontMetrics.ascent(baselineType());
        else if (verticalAlign == MIDDLE)
            verticalPosition = (verticalPosition - static_cast<LayoutUnit>(fontMetrics.xHeight() / 2) - renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection)).round();
        else if (verticalAlign == TEXT_BOTTOM) {
            verticalPosition += fontMetrics.descent(baselineType());
            // lineHeight - baselinePosition is always 0 for replaced elements (except inline blocks), so don't bother wasting time in that case.
            if (!renderer->isReplaced() || renderer->isInlineBlockOrInlineTable())
                verticalPosition -= (renderer->lineHeight(firstLine, lineDirection) - renderer->baselinePosition(baselineType(), firstLine, lineDirection));
        } else if (verticalAlign == BASELINE_MIDDLE)
            verticalPosition += -renderer->lineHeight(firstLine, lineDirection) / 2 + renderer->baselinePosition(baselineType(), firstLine, lineDirection);
        else if (verticalAlign == LENGTH) {
            LayoutUnit lineHeight;
            //Per http://www.w3.org/TR/CSS21/visudet.html#propdef-vertical-align: 'Percentages: refer to the 'line-height' of the element itself'.
            if (renderer->style()->verticalAlignLength().isPercent())
                lineHeight = renderer->style()->computedLineHeight();
            else
                lineHeight = renderer->lineHeight(firstLine, lineDirection);
            verticalPosition -= valueForLength(renderer->style()->verticalAlignLength(), lineHeight);
        }
    }

    // Store the cached value.
    if (isRenderInline && !firstLine)
        verticalPositionCache.set(renderer, baselineType(), verticalPosition);

    return verticalPosition;
}

bool RootInlineBox::includeLeadingForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText()))
        return false;

    LineBoxContain lineBoxContain = renderer().style()->lineBoxContain();
    return (lineBoxContain & LineBoxContainInline) || (box == this && (lineBoxContain & LineBoxContainBlock));
}

bool RootInlineBox::includeFontForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText()))
        return false;

    if (!box->isText() && box->isInlineFlowBox() && !toInlineFlowBox(box)->hasTextChildren())
        return false;

    // For now map "glyphs" to "font" in vertical text mode until the bounds returned by glyphs aren't garbage.
    LineBoxContain lineBoxContain = renderer().style()->lineBoxContain();
    return (lineBoxContain & LineBoxContainFont) || (!isHorizontal() && (lineBoxContain & LineBoxContainGlyphs));
}

bool RootInlineBox::includeGlyphsForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText()))
        return false;

    if (!box->isText() && box->isInlineFlowBox() && !toInlineFlowBox(box)->hasTextChildren())
        return false;

    // FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage.
    LineBoxContain lineBoxContain = renderer().style()->lineBoxContain();
    return isHorizontal() && (lineBoxContain & LineBoxContainGlyphs);
}

bool RootInlineBox::includeMarginForBox(InlineBox* box) const
{
    if (box->renderer().isReplaced() || (box->renderer().isText() && !box->isText()))
        return false;

    LineBoxContain lineBoxContain = renderer().style()->lineBoxContain();
    return lineBoxContain & LineBoxContainInlineBox;
}


bool RootInlineBox::fitsToGlyphs() const
{
    // FIXME: We can't fit to glyphs yet for vertical text, since the bounds returned are garbage.
    LineBoxContain lineBoxContain = renderer().style()->lineBoxContain();
    return isHorizontal() && (lineBoxContain & LineBoxContainGlyphs);
}

bool RootInlineBox::includesRootLineBoxFontOrLeading() const
{
    LineBoxContain lineBoxContain = renderer().style()->lineBoxContain();
    return (lineBoxContain & LineBoxContainBlock) || (lineBoxContain & LineBoxContainInline) || (lineBoxContain & LineBoxContainFont);
}

Node* RootInlineBox::getLogicalStartBoxWithNode(InlineBox*& startBox) const
{
    Vector<InlineBox*> leafBoxesInLogicalOrder;
    collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder);
    for (size_t i = 0; i < leafBoxesInLogicalOrder.size(); ++i) {
        if (leafBoxesInLogicalOrder[i]->renderer().node()) {
            startBox = leafBoxesInLogicalOrder[i];
            return startBox->renderer().node();
        }
    }
    startBox = 0;
    return 0;
}

Node* RootInlineBox::getLogicalEndBoxWithNode(InlineBox*& endBox) const
{
    Vector<InlineBox*> leafBoxesInLogicalOrder;
    collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder);
    for (size_t i = leafBoxesInLogicalOrder.size(); i > 0; --i) {
        if (leafBoxesInLogicalOrder[i - 1]->renderer().node()) {
            endBox = leafBoxesInLogicalOrder[i - 1];
            return endBox->renderer().node();
        }
    }
    endBox = 0;
    return 0;
}

#ifndef NDEBUG
const char* RootInlineBox::boxName() const
{
    return "RootInlineBox";
}
#endif

} // namespace WebCore
/* [<][>][^][v][top][bottom][index][help] */
root/Source/core/rendering/RootInlineBox.cpp

DEFINITIONS
