C++ InlineBox类代码示例

InlineBox* SVGRootInlineBox::closestLeafChildForPosition(const LayoutPoint& point)
{
    InlineBox* firstLeaf = firstLeafChild();
    InlineBox* lastLeaf = lastLeafChild();
    if (firstLeaf == lastLeaf)
        return firstLeaf;

    // FIXME: Check for vertical text!
    InlineBox* closestLeaf = 0;
    for (InlineBox* leaf = firstLeaf; leaf; leaf = leaf->nextLeafChild()) {
        if (!leaf->isSVGInlineTextBox())
            continue;
        if (point.y() < leaf->y())
            continue;
        if (point.y() > leaf->y() + leaf->virtualLogicalHeight())
            continue;

        closestLeaf = leaf;
        if (point.x() < leaf->left() + leaf->logicalWidth())
            return leaf;
    }

    return closestLeaf ? closestLeaf : lastLeaf;
}

void RenderSVGText::absoluteQuads(Vector<FloatQuad>& quads)
{
    RenderSVGRoot* root = findSVGRootObject(parent());
    if (!root)
        return;
 
    // Don't use objectBoundingBox here, as it's unites the selection rects. Makes it hard
    // to spot errors, if there are any using WebInspector. Individually feed them into 'rects'.
    for (InlineFlowBox* flow = firstLineBox(); flow; flow = flow->nextLineBox()) {
        for (InlineBox* box = flow->firstChild(); box; box = box->nextOnLine()) {
            FloatRect boxRect(box->x(), box->y(), box->width(), box->height());
            // FIXME: crawling up the parent chain to map each quad is very inefficient
            // we should compute the absoluteTransform outside this loop first.
            quads.append(localToAbsoluteQuad(boxRect));
        }
    }
}

FloatRect RenderSVGText::relativeBBox(bool includeStroke) const
{
    FloatRect repaintRect;

    for (InlineRunBox* runBox = firstLineBox(); runBox; runBox = runBox->nextLineBox()) {
        ASSERT(runBox->isInlineFlowBox());

        InlineFlowBox* flowBox = static_cast<InlineFlowBox*>(runBox);
        for (InlineBox* box = flowBox->firstChild(); box; box = box->nextOnLine())
            repaintRect.unite(FloatRect(box->xPos(), box->yPos(), box->width(), box->height()));
    }

    // SVG needs to include the strokeWidth(), not the textStrokeWidth().
    if (includeStroke && style()->svgStyle()->hasStroke())
        repaintRect.inflate(narrowPrecisionToFloat(KSVGPainterFactory::cssPrimitiveToLength(this, style()->svgStyle()->strokeWidth(), 0.0)));

    repaintRect.move(xPos(), yPos());
    return repaintRect;
}

void RenderSVGText::absoluteRects(Vector<IntRect>& rects, int, int)
{
    RenderSVGRoot* root = findSVGRootObject(parent());
    if (!root)
        return;
 
    // Don't use objectBoundingBox here, as it's unites the selection rects. Makes it hard
    // to spot errors, if there are any using WebInspector. Individually feed them into 'rects'.
    for (InlineRunBox* runBox = firstLineBox(); runBox; runBox = runBox->nextLineBox()) {
        ASSERT(runBox->isInlineFlowBox());

        InlineFlowBox* flowBox = static_cast<InlineFlowBox*>(runBox);
        for (InlineBox* box = flowBox->firstChild(); box; box = box->nextOnLine()) {
            FloatRect boxRect(box->x(), box->y(), box->width(), box->height());
            // FIXME: crawling up the parent chain to map each rect is very inefficient
            // we should compute the absoluteTransform outside this loop first.
            rects.append(enclosingIntRect(localToAbsoluteQuad(boxRect).boundingBox()));
        }
    }
}

void SVGRootInlineBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit, LayoutUnit)
{
    ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
    ASSERT(!paintInfo.context->paintingDisabled());

    bool isPrinting = renderer().document().printing();
    bool hasSelection = !isPrinting && selectionState() != RenderObject::SelectionNone;

    PaintInfo childPaintInfo(paintInfo);
    if (hasSelection) {
        for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
            if (child->isSVGInlineTextBox())
                toSVGInlineTextBox(child)->paintSelectionBackground(childPaintInfo);
            else if (child->isSVGInlineFlowBox())
                toSVGInlineFlowBox(child)->paintSelectionBackground(childPaintInfo);
        }
    }

    SVGRenderingContext renderingContext(&renderer(), paintInfo, SVGRenderingContext::SaveGraphicsContext);
    if (renderingContext.isRenderingPrepared()) {
        for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
            child->paint(paintInfo, paintOffset, 0, 0);
    }
}

static void applyTextAnchorToTextChunk(SVGTextChunk& chunk)
{
    // This method is not called for chunks containing chars aligned on a path.
    // -> all characters are visible, no need to check for "isHidden()" anywhere.

    if (chunk.anchor == TA_START)
        return;

    float shift = calculateTextAnchorShiftForTextChunk(chunk, chunk.anchor);

    // Apply correction to chunk
    Vector<SVGChar>::iterator chunkIt = chunk.start;
    for (; chunkIt != chunk.end; ++chunkIt) {
        SVGChar& curChar = *chunkIt;

        if (chunk.isVerticalText)
            curChar.y += shift;
        else
            curChar.x += shift;
    }

    // Move inline boxes
    Vector<SVGInlineBoxCharacterRange>::iterator boxIt = chunk.boxes.begin();
    Vector<SVGInlineBoxCharacterRange>::iterator boxEnd = chunk.boxes.end();

    for (; boxIt != boxEnd; ++boxIt) {
        SVGInlineBoxCharacterRange& range = *boxIt;

        InlineBox* curBox = range.box;
        ASSERT(curBox->isSVGInlineTextBox());

        // Move target box
        if (chunk.isVerticalText)
            curBox->setY(curBox->y() + static_cast<int>(shift));
        else
            curBox->setX(curBox->x() + static_cast<int>(shift));
    }
}

void RenderSVGText::absoluteRects(Vector<IntRect>& rects, int, int, bool)
{
    RenderSVGRoot* root = findSVGRootObject(parent());
    if (!root)
        return;

    int x, y;
    absolutePosition(x, y);

    AffineTransform htmlParentCtm = root->RenderContainer::absoluteTransform();
 
    // Don't use relativeBBox here, as it's unites the selection rects. Makes it hard
    // to spot errors, if there are any using WebInspector. Individually feed them into 'rects'.
    for (InlineRunBox* runBox = firstLineBox(); runBox; runBox = runBox->nextLineBox()) {
        ASSERT(runBox->isInlineFlowBox());

        InlineFlowBox* flowBox = static_cast<InlineFlowBox*>(runBox);
        for (InlineBox* box = flowBox->firstChild(); box; box = box->nextOnLine()) {
            FloatRect boxRect(box->xPos(), box->yPos(), box->width(), box->height());
            boxRect.move(narrowPrecisionToFloat(x - htmlParentCtm.e()), narrowPrecisionToFloat(y - htmlParentCtm.f()));
            rects.append(enclosingIntRect(absoluteTransform().mapRect(boxRect)));
        }
    }
}

void InlineFlowBoxPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutUnit lineTop, const LayoutUnit lineBottom)
{
    LayoutRect overflowRect(m_inlineFlowBox.visualOverflowRect(lineTop, lineBottom));
    m_inlineFlowBox.flipForWritingMode(overflowRect);
    overflowRect.moveBy(paintOffset);

    if (!paintInfo.rect.intersects(pixelSnappedIntRect(overflowRect)))
        return;

    if (paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) {
        // Add ourselves to the paint info struct's list of inlines that need to paint their
        // outlines.
        if (m_inlineFlowBox.layoutObject().style()->visibility() == VISIBLE && m_inlineFlowBox.layoutObject().style()->hasOutline() && !m_inlineFlowBox.isRootInlineBox()) {
            LayoutInline& inlineFlow = toLayoutInline(m_inlineFlowBox.layoutObject());

            LayoutBlock* cb = 0;
            bool containingBlockPaintsContinuationOutline = inlineFlow.continuation() || inlineFlow.isInlineElementContinuation();
            if (containingBlockPaintsContinuationOutline) {
                // FIXME: See https://bugs.webkit.org/show_bug.cgi?id=54690. We currently don't reconnect inline continuations
                // after a child removal. As a result, those merged inlines do not get seperated and hence not get enclosed by
                // anonymous blocks. In this case, it is better to bail out and paint it ourself.
                LayoutBlock* enclosingAnonymousBlock = m_inlineFlowBox.layoutObject().containingBlock();
                if (!enclosingAnonymousBlock->isAnonymousBlock()) {
                    containingBlockPaintsContinuationOutline = false;
                } else {
                    cb = enclosingAnonymousBlock->containingBlock();
                    for (LayoutBoxModelObject* box = m_inlineFlowBox.boxModelObject(); box != cb; box = box->parent()->enclosingBoxModelObject()) {
                        if (box->hasSelfPaintingLayer()) {
                            containingBlockPaintsContinuationOutline = false;
                            break;
                        }
                    }
                }
            }

            if (containingBlockPaintsContinuationOutline) {
                // Add ourselves to the containing block of the entire continuation so that it can
                // paint us atomically.
                cb->addContinuationWithOutline(toLayoutInline(m_inlineFlowBox.layoutObject().node()->layoutObject()));
            } else if (!inlineFlow.isInlineElementContinuation()) {
                paintInfo.outlineObjects()->add(&inlineFlow);
            }
        }
    } else if (paintInfo.phase == PaintPhaseMask) {
        DrawingRecorder recorder(*paintInfo.context, m_inlineFlowBox, DisplayItem::paintPhaseToDrawingType(paintInfo.phase), pixelSnappedIntRect(overflowRect));
        if (!recorder.canUseCachedDrawing())
            paintMask(paintInfo, paintOffset);
        return;
    } else if (paintInfo.phase == PaintPhaseForeground) {
        // Paint our background, border and box-shadow.
        paintBoxDecorationBackground(paintInfo, paintOffset);
    }

    // Paint our children.
    if (paintInfo.phase != PaintPhaseSelfOutline) {
        PaintInfo childInfo(paintInfo);
        childInfo.phase = paintInfo.phase == PaintPhaseChildOutlines ? PaintPhaseOutline : paintInfo.phase;

        if (childInfo.paintingRoot && childInfo.paintingRoot->isDescendantOf(&m_inlineFlowBox.layoutObject()))
            childInfo.paintingRoot = 0;
        else
            childInfo.updatePaintingRootForChildren(&m_inlineFlowBox.layoutObject());

        for (InlineBox* curr = m_inlineFlowBox.firstChild(); curr; curr = curr->nextOnLine()) {
            if (curr->layoutObject().isText() || !curr->boxModelObject()->hasSelfPaintingLayer())
                curr->paint(childInfo, paintOffset, lineTop, lineBottom);
        }
    }
}

unsigned char RenderedPosition::bidiLevelOnRight() const
{
    InlineBox* box = atRightmostOffsetInBox() ? nextLeafChild() : m_inlineBox;
    return box ? box->bidiLevel() : 0;
}

//.........这里部分代码省略.........
                QRect r(pix.rect());
                r = r.intersect(QRect(0, 0, cWidth-4, cHeight-4));
                p->drawPixmap( QPoint( _tx + leftBorder + leftPad+2, _ty + topBorder + topPad+2), pix, r );
            }
            if(!alt.isEmpty()) {
                QString text = alt.string();
                text.replace('\\', backslashAsCurrencySymbol());
                p->setFont(style()->font());
                p->setPen( style()->color() );
                int ax = _tx + leftBorder + leftPad + 2;
                int ay = _ty + topBorder + topPad + 2;
                const QFontMetrics &fm = style()->fontMetrics();
                if (cWidth>5 && cHeight>=fm.height())
                    p->drawText(ax, ay+1, cWidth - 4, cHeight - 4, Qt::WordBreak, text );
            }
#endif /* APPLE_CHANGES not defined */
        }
    }
    else if (image && !image->isTransparent())
    {
#if APPLE_CHANGES
        // Do the calculations to draw selections as tall as the line.
        // Ignore the passed-in value for _ty.
        // Use the bottom of the line above as the y position (if there is one, 
        // otherwise use the top of this renderer's line) and the height of the line as the height. 
        // This mimics Cocoa.
        int selectionTop = -1;
        int selectionHeight = -1;
        int selectionLeft = -1;
        int selectionRight = -1;
        bool extendSelectionToLeft = false;
        bool extendSelectionToRight = false;
        if (drawSelectionTint) {
            InlineBox *box = inlineBox();
            if (box) {
                // Get a value for selectionTop that is relative to the containing block.
                // This value is used for determining left and right offset for the selection, if necessary,
                // and for calculating the selection height.
                if (box->root()->prevRootBox())
                    selectionTop = box->root()->prevRootBox()->bottomOverflow();
                else
                    selectionTop = box->root()->topOverflow();

                selectionHeight = box->root()->bottomOverflow() - selectionTop;

                int absx, absy;
                containingBlock()->absolutePosition(absx, absy);

                if (selectionState() == SelectionInside && box->root()->firstLeafChild() == box) {
                    extendSelectionToLeft = true;
                    selectionLeft = absx + containingBlock()->leftOffset(selectionTop);
                }
                if (selectionState() == SelectionInside && box->root()->lastLeafChild() == box) {
                    extendSelectionToRight = true;
                    selectionRight = absx + containingBlock()->rightOffset(selectionTop);
                }
        
                // Now make the selectionTop an absolute coordinate.
                selectionTop += absy;
            }
        }
#endif

        if ( (cWidth != intrinsicWidth() ||  cHeight != intrinsicHeight()) &&
             pix.width() > 0 && pix.height() > 0 && image->valid_rect().isValid())
        {

VisiblePosition nextLinePosition(const VisiblePosition &visiblePosition, int x)
{
    Position p = visiblePosition.deepEquivalent();
    Node *node = p.node();
    Node* highestRoot = highestEditableRoot(p);
    if (!node)
        return VisiblePosition();
    
    node->document()->updateLayoutIgnorePendingStylesheets();

    RenderObject *renderer = node->renderer();
    if (!renderer)
        return VisiblePosition();

    RenderBlock *containingBlock = 0;
    RootInlineBox *root = 0;
    InlineBox* box;
    int ignoredCaretOffset;
    visiblePosition.getInlineBoxAndOffset(box, ignoredCaretOffset);
    if (box) {
        root = box->root()->nextRootBox();
        if (root)
            containingBlock = renderer->containingBlock();
    }

    if (!root) {
        // This containing editable block does not have a next line.
        // Need to move forward to next containing editable block in this root editable
        // block and find the first root line box in that block.
        Node* startBlock = enclosingNodeWithNonInlineRenderer(node);
        Node* n = nextLeafWithSameEditability(node, p.deprecatedEditingOffset());
        while (n && startBlock == enclosingNodeWithNonInlineRenderer(n))
            n = nextLeafWithSameEditability(n);
        while (n) {
            if (highestEditableRoot(Position(n, 0)) != highestRoot)
                break;
            Position pos(n, caretMinOffset(n));
            if (pos.isCandidate()) {
                ASSERT(n->renderer());
                pos.getInlineBoxAndOffset(DOWNSTREAM, box, ignoredCaretOffset);
                if (box) {
                    // next root line box found
                    root = box->root();
                    containingBlock = n->renderer()->containingBlock();
                    break;
                }

                return VisiblePosition(pos, DOWNSTREAM);
            }
            n = nextLeafWithSameEditability(n);
        }
    }
    
    if (root) {
        // FIXME: Can be wrong for multi-column layout and with transforms.
        FloatPoint absPos = containingBlock->localToAbsolute(FloatPoint());
        if (containingBlock->hasOverflowClip())
            absPos -= containingBlock->layer()->scrolledContentOffset();
        RenderObject* renderer = root->closestLeafChildForXPos(x - absPos.x(), isEditablePosition(p))->renderer();
        Node* node = renderer->node();
        if (node && editingIgnoresContent(node))
            return Position(node->parent(), node->nodeIndex());
        return renderer->positionForPoint(IntPoint(x - absPos.x(), root->lineTop()));
    }    

    // Could not find a next line. This means we must already be on the last line.
    // Move to the end of the content in this block, which effectively moves us
    // to the end of the line we're on.
    Element* rootElement = node->isContentEditable() ? node->rootEditableElement() : node->document()->documentElement();
    return VisiblePosition(rootElement, rootElement ? rootElement->childNodeCount() : 0, DOWNSTREAM);
}

void RenderLineBoxList::dirtyLinesFromChangedChild(RenderBoxModelObject& container, RenderObject& child)
{
    ASSERT(is<RenderInline>(container) || is<RenderBlockFlow>(container));
    if (!container.parent() || (is<RenderBlockFlow>(container) && container.selfNeedsLayout()))
        return;

    RenderInline* inlineContainer = is<RenderInline>(container) ? &downcast<RenderInline>(container) : nullptr;
    InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox();

    // If we have no first line box, then just bail early.
    if (!firstBox) {
        // For an empty inline, propagate the check up to our parent, unless the parent is already dirty.
        if (container.isInline() && !container.ancestorLineBoxDirty()) {
            container.parent()->dirtyLinesFromChangedChild(container);
            container.setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
        }
        return;
    }

    // Try to figure out which line box we belong in. First try to find a previous
    // line box by examining our siblings. If we didn't find a line box, then use our
    // parent's first line box.
    RootInlineBox* box = nullptr;
    RenderObject* current;
    for (current = child.previousSibling(); current; current = current->previousSibling()) {
        if (current->isFloatingOrOutOfFlowPositioned())
            continue;

        if (current->isReplaced()) {
            if (auto wrapper = downcast<RenderBox>(*current).inlineBoxWrapper())
                box = &wrapper->root();
        } if (is<RenderLineBreak>(*current)) {
            if (auto wrapper = downcast<RenderLineBreak>(*current).inlineBoxWrapper())
                box = &wrapper->root();
        } else if (is<RenderText>(*current)) {
            if (InlineTextBox* textBox = downcast<RenderText>(*current).lastTextBox())
                box = &textBox->root();
        } else if (is<RenderInline>(*current)) {
            InlineBox* lastSiblingBox = downcast<RenderInline>(*current).lastLineBoxIncludingCulling();
            if (lastSiblingBox)
                box = &lastSiblingBox->root();
        }

        if (box)
            break;
    }
    if (!box) {
        if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) {
            // https://bugs.webkit.org/show_bug.cgi?id=60778
            // We may have just removed a <br> with no line box that was our first child. In this case
            // we won't find a previous sibling, but firstBox can be pointing to a following sibling.
            // This isn't good enough, since we won't locate the root line box that encloses the removed
            // <br>. We have to just over-invalidate a bit and go up to our parent.
            if (!inlineContainer->ancestorLineBoxDirty()) {
                inlineContainer->parent()->dirtyLinesFromChangedChild(*inlineContainer);
                inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
            }
            return;
        }
        box = &firstBox->root();
    }

    // If we found a line box, then dirty it.
    if (box) {
        box->markDirty();

        // Dirty the adjacent lines that might be affected.
        // NOTE: we dirty the previous line because RootInlineBox objects cache
        // the address of the first object on the next line after a BR, which we may be
        // invalidating here. For more info, see how RenderBlock::layoutInlineChildren
        // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak,
        // despite the name, actually returns the first RenderObject after the BR.
        // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
        if (RootInlineBox* prevBox = box->prevRootBox())
            prevBox->markDirty();

        // FIXME: We shouldn't need to always dirty the next line. This is only strictly 
        // necessary some of the time, in situations involving BRs.
        if (RootInlineBox* nextBox = box->nextRootBox()) {
            nextBox->markDirty();
            // Dedicated linebox for floats may be added as the last rootbox. If this occurs with BRs inside inlines that propagte their lineboxes to
            // the parent flow, we need to invalidate it explicitly.
            // FIXME: We should be able to figure out the actual "changed child" even when we are calling through empty inlines recursively.
            if (is<RenderInline>(child) && !downcast<RenderInline>(child).firstLineBoxIncludingCulling()) {
                auto* lastRootBox = nextBox->blockFlow().lastRootBox();
                if (lastRootBox->isTrailingFloatsRootInlineBox() && !lastRootBox->isDirty())
                    lastRootBox->markDirty();
            }
        }
    }
}

GapRects RootInlineBox::fillLineSelectionGap(int selTop, int selHeight, RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,
                                             const RenderObject::PaintInfo* paintInfo)
{
    RenderObject::SelectionState lineState = selectionState();

    bool leftGap, rightGap;
    block()->getHorizontalSelectionGapInfo(lineState, leftGap, rightGap);

    GapRects result;

    InlineBox* firstBox = firstSelectedBox();
    InlineBox* lastBox = lastSelectedBox();
    if (leftGap)
        result.uniteLeft(block()->fillLeftSelectionGap(firstBox->parent()->object(),
                                                       firstBox->xPos(), selTop, selHeight,
                                                       rootBlock, blockX, blockY, tx, ty, paintInfo));
    if (rightGap)
        result.uniteRight(block()->fillRightSelectionGap(lastBox->parent()->object(),
                                                         lastBox->xPos() + lastBox->width(), selTop, selHeight,
                                                         rootBlock, blockX, blockY, tx, ty, paintInfo));

    if (firstBox && firstBox != lastBox) {
        // Now fill in any gaps on the line that occurred between two selected elements.
        int lastX = firstBox->xPos() + firstBox->width();
        for (InlineBox* box = firstBox->nextLeafChild(); box; box = box->nextLeafChild()) {
            if (box->selectionState() != RenderObject::SelectionNone) {
                result.uniteCenter(block()->fillHorizontalSelectionGap(box->parent()->object(),
                                                                       lastX + tx, selTop + ty,
                                                                       box->xPos() - lastX, selHeight, paintInfo));
                lastX = box->xPos() + box->width();
            }
            if (box == lastBox)
                break;
        }
    }

    return result;
}

void SVGRootInlineBox::markDirty()
{
    for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
        child->markDirty();
    RootInlineBox::markDirty();
}

void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
{
    if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isBlockFlow())))
        return;

    RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0;
    InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox();

    // If we have no first line box, then just bail early.
    if (!firstBox) {
        // For an empty inline, go ahead and propagate the check up to our parent, unless the parent
        // is already dirty.
        if (container->isInline() && !container->ancestorLineBoxDirty()) {
            container->parent()->dirtyLinesFromChangedChild(container);
            container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
        }
        return;
    }

    // Try to figure out which line box we belong in.  First try to find a previous
    // line box by examining our siblings.  If we didn't find a line box, then use our 
    // parent's first line box.
    RootInlineBox* box = 0;
    RenderObject* curr = 0;
    for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
        if (curr->isFloatingOrOutOfFlowPositioned())
            continue;

        if (curr->isReplaced()) {
            InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper();
            if (wrapper)
                box = wrapper->root();
        } else if (curr->isText()) {
            InlineTextBox* textBox = toRenderText(curr)->lastTextBox();
            if (textBox)
                box = textBox->root();
        } else if (curr->isRenderInline()) {
            InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling();
            if (lastSiblingBox)
                box = lastSiblingBox->root();
        }

        if (box)
            break;
    }
    if (!box) {
        if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) {
            // https://bugs.webkit.org/show_bug.cgi?id=60778
            // We may have just removed a <br> with no line box that was our first child. In this case
            // we won't find a previous sibling, but firstBox can be pointing to a following sibling.
            // This isn't good enough, since we won't locate the root line box that encloses the removed
            // <br>. We have to just over-invalidate a bit and go up to our parent.
            if (!inlineContainer->ancestorLineBoxDirty()) {
                inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer);
                inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree.
            }
            return;
        }
        box = firstBox->root();
    }

    // If we found a line box, then dirty it.
    if (box) {
        RootInlineBox* adjacentBox;
        box->markDirty();

        // dirty the adjacent lines that might be affected
        // NOTE: we dirty the previous line because RootInlineBox objects cache
        // the address of the first object on the next line after a BR, which we may be
        // invalidating here.  For more info, see how RenderBlock::layoutInlineChildren
        // calls setLineBreakInfo with the result of findNextLineBreak.  findNextLineBreak,
        // despite the name, actually returns the first RenderObject after the BR.
        // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
        adjacentBox = box->prevRootBox();
        if (adjacentBox)
            adjacentBox->markDirty();
        adjacentBox = box->nextRootBox();
        // If |child| has been inserted before the first element in the linebox, but after collapsed leading
        // space, the search for |child|'s linebox will go past the leading space to the previous linebox and select that
        // one as |box|. If we hit that situation here, dirty the |box| actually containing the child too. 
        bool insertedAfterLeadingSpace = box->lineBreakObj() == child->previousSibling();
        if (adjacentBox && (adjacentBox->lineBreakObj() == child || child->isBR() || (curr && curr->isBR()) || insertedAfterLeadingSpace))
            adjacentBox->markDirty();
    }
}