RenderTableSection.cpp

/*
 * Copyright (C) 1997 Martin Jones (mjones@kde.org)
 *           (C) 1997 Torben Weis (weis@kde.org)
 *           (C) 1998 Waldo Bastian (bastian@kde.org)
 *           (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
 * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
 *
 * 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 "RenderTableSection.h"
#include "CachedImage.h"
#include "Document.h"
#include "HitTestResult.h"
#include "HTMLNames.h"
#include "PaintInfo.h"
#include "RenderTableCell.h"
#include "RenderTableCol.h"
#include "RenderTableRow.h"
#include "RenderView.h"
#include <limits>
#include <wtf/HashSet.h>
#include <wtf/Vector.h>

using namespace std;

namespace WebCore {

using namespace HTMLNames;

static inline void setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(RenderTableSection::RowStruct* row)
{
    ASSERT(row && row->rowRenderer);
    row->logicalHeight = row->rowRenderer->style()->logicalHeight();
    if (row->logicalHeight.isRelative())
        row->logicalHeight = Length();
}

RenderTableSection::RenderTableSection(Node* node)
    : RenderBox(node)
    , m_gridRows(0)
    , m_cCol(0)
    , m_cRow(-1)
    , m_outerBorderStart(0)
    , m_outerBorderEnd(0)
    , m_outerBorderBefore(0)
    , m_outerBorderAfter(0)
    , m_needsCellRecalc(false)
    , m_hasOverflowingCell(false)
    , m_hasMultipleCellLevels(false)
{
    // init RenderObject attributes
    setInline(false); // our object is not Inline
}

RenderTableSection::~RenderTableSection()
{
    clearGrid();
}

void RenderTableSection::destroy()
{
    RenderTable* recalcTable = table();
    
    RenderBox::destroy();
    
    // recalc cell info because RenderTable has unguarded pointers
    // stored that point to this RenderTableSection.
    if (recalcTable)
        recalcTable->setNeedsSectionRecalc();
}

void RenderTableSection::addChild(RenderObject* child, RenderObject* beforeChild)
{
    // Make sure we don't append things after :after-generated content if we have it.
    if (!beforeChild && isAfterContent(lastChild()))
        beforeChild = lastChild();

    if (!child->isTableRow()) {
        RenderObject* last = beforeChild;
        if (!last)
            last = lastChild();
        if (last && last->isAnonymous()) {
            if (beforeChild == last)
                beforeChild = last->firstChild();
            last->addChild(child, beforeChild);
            return;
        }

        // If beforeChild is inside an anonymous cell/row, insert into the cell or into
        // the anonymous row containing it, if there is one.
        RenderObject* lastBox = last;
        while (lastBox && lastBox->parent()->isAnonymous() && !lastBox->isTableRow())
            lastBox = lastBox->parent();
        if (lastBox && lastBox->isAnonymous()) {
            lastBox->addChild(child, beforeChild);
            return;
        }

        RenderObject* row = new (renderArena()) RenderTableRow(document() /* anonymous table row */);
        RefPtr<RenderStyle> newStyle = RenderStyle::create();
        newStyle->inheritFrom(style());
        newStyle->setDisplay(TABLE_ROW);
        row->setStyle(newStyle.release());
        addChild(row, beforeChild);
        row->addChild(child);
        return;
    }

    if (beforeChild)
        setNeedsCellRecalc();

    ++m_cRow;
    m_cCol = 0;

    // make sure we have enough rows
    if (!ensureRows(m_cRow + 1))
        return;

    m_grid[m_cRow].rowRenderer = toRenderTableRow(child);

    if (!beforeChild)
        setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(&m_grid[m_cRow]);

    // If the next renderer is actually wrapped in an anonymous table row, we need to go up and find that.
    while (beforeChild && beforeChild->parent() != this)
        beforeChild = beforeChild->parent();

    ASSERT(!beforeChild || beforeChild->isTableRow());
    RenderBox::addChild(child, beforeChild);
}

void RenderTableSection::removeChild(RenderObject* oldChild)
{
    setNeedsCellRecalc();
    RenderBox::removeChild(oldChild);
}

bool RenderTableSection::ensureRows(int numRows)
{
    int nRows = m_gridRows;
    if (numRows > nRows) {
        if (numRows > static_cast<int>(m_grid.size())) {
            size_t maxSize = numeric_limits<size_t>::max() / sizeof(RowStruct);
            if (static_cast<size_t>(numRows) > maxSize)
                return false;
            m_grid.grow(numRows);
        }
        m_gridRows = numRows;
        int nCols = max(1, table()->numEffCols());
        for (int r = nRows; r < numRows; r++) {
            m_grid[r].row = new Row(nCols);
            m_grid[r].rowRenderer = 0;
            m_grid[r].baseline = 0;
            m_grid[r].logicalHeight = Length();
        }
    }

    return true;
}

void RenderTableSection::addCell(RenderTableCell* cell, RenderTableRow* row)
{
    int rSpan = cell->rowSpan();
    int cSpan = cell->colSpan();
    Vector<RenderTable::ColumnStruct>& columns = table()->columns();
    int nCols = columns.size();

    // ### mozilla still seems to do the old HTML way, even for strict DTD
    // (see the annotation on table cell layouting in the CSS specs and the testcase below:
    // <TABLE border>
    // <TR><TD>1 <TD rowspan="2">2 <TD>3 <TD>4
    // <TR><TD colspan="2">5
    // </TABLE>
    while (m_cCol < nCols && (cellAt(m_cRow, m_cCol).hasCells() || cellAt(m_cRow, m_cCol).inColSpan))
        m_cCol++;

    if (rSpan == 1) {
        // we ignore height settings on rowspan cells
        Length logicalHeight = cell->style()->logicalHeight();
        if (logicalHeight.isPositive() || (logicalHeight.isRelative() && logicalHeight.value() >= 0)) {
            Length cRowLogicalHeight = m_grid[m_cRow].logicalHeight;
            switch (logicalHeight.type()) {
                case Percent:
                    if (!(cRowLogicalHeight.isPercent()) ||
                        (cRowLogicalHeight.isPercent() && cRowLogicalHeight.rawValue() < logicalHeight.rawValue()))
                        m_grid[m_cRow].logicalHeight = logicalHeight;
                        break;
                case Fixed:
                    if (cRowLogicalHeight.type() < Percent ||
                        (cRowLogicalHeight.isFixed() && cRowLogicalHeight.value() < logicalHeight.value()))
                        m_grid[m_cRow].logicalHeight = logicalHeight;
                    break;
                case Relative:
                default:
                    break;
            }
        }
    }

    // make sure we have enough rows
    if (!ensureRows(m_cRow + rSpan))
        return;

    m_grid[m_cRow].rowRenderer = row;

    int col = m_cCol;
    // tell the cell where it is
    bool inColSpan = false;
    while (cSpan) {
        int currentSpan;
        if (m_cCol >= nCols) {
            table()->appendColumn(cSpan);
            currentSpan = cSpan;
        } else {
            if (cSpan < (int)columns[m_cCol].span)
                table()->splitColumn(m_cCol, cSpan);
            currentSpan = columns[m_cCol].span;
        }
        for (int r = 0; r < rSpan; r++) {
            CellStruct& c = cellAt(m_cRow + r, m_cCol);
            ASSERT(cell);
            c.cells.append(cell);
            // If cells overlap then we take the slow path for painting.
            if (c.cells.size() > 1)
                m_hasMultipleCellLevels = true;
            if (inColSpan)
                c.inColSpan = true;
        }
        m_cCol++;
        cSpan -= currentSpan;
        inColSpan = true;
    }
    cell->setRow(m_cRow);
    cell->setCol(table()->effColToCol(col));
}

void RenderTableSection::setCellLogicalWidths()
{
    Vector<int>& columnPos = table()->columnPositions();

    LayoutStateMaintainer statePusher(view());
    
    for (int i = 0; i < m_gridRows; i++) {
        Row& row = *m_grid[i].row;
        int cols = row.size();
        for (int j = 0; j < cols; j++) {
            CellStruct& current = row[j];
            RenderTableCell* cell = current.primaryCell();
            if (!cell || current.inColSpan)
              continue;
            int endCol = j;
            int cspan = cell->colSpan();
            while (cspan && endCol < cols) {
                ASSERT(endCol < (int)table()->columns().size());
                cspan -= table()->columns()[endCol].span;
                endCol++;
            }
            int w = columnPos[endCol] - columnPos[j] - table()->hBorderSpacing();
            int oldLogicalWidth = cell->logicalWidth();
            if (w != oldLogicalWidth) {
                cell->setNeedsLayout(true);
                if (!table()->selfNeedsLayout() && cell->checkForRepaintDuringLayout()) {
                    if (!statePusher.didPush()) {
                        // Technically, we should also push state for the row, but since
                        // rows don't push a coordinate transform, that's not necessary.
                        statePusher.push(this, IntSize(x(), y()));
                    }
                    cell->repaint();
                }
                cell->updateLogicalWidth(w);
            }
        }
    }
    
    statePusher.pop(); // only pops if we pushed
}

int RenderTableSection::calcRowLogicalHeight()
{
#ifndef NDEBUG
    setNeedsLayoutIsForbidden(true);
#endif

    ASSERT(!needsLayout());

    RenderTableCell* cell;

    int spacing = table()->vBorderSpacing();

    LayoutStateMaintainer statePusher(view());

    m_rowPos.resize(m_gridRows + 1);
    m_rowPos[0] = spacing;

    for (int r = 0; r < m_gridRows; r++) {
        m_rowPos[r + 1] = 0;
        m_grid[r].baseline = 0;
        int baseline = 0;
        int bdesc = 0;
        int ch = m_grid[r].logicalHeight.calcMinValue(0);
        int pos = m_rowPos[r] + ch + (m_grid[r].rowRenderer ? spacing : 0);

        m_rowPos[r + 1] = max(m_rowPos[r + 1], pos);

        Row* row = m_grid[r].row;
        int totalCols = row->size();

        for (int c = 0; c < totalCols; c++) {
            CellStruct& current = cellAt(r, c);
            cell = current.primaryCell();

            if (!cell || current.inColSpan)
                continue;

            if ((cell->row() + cell->rowSpan() - 1) > r)
                continue;

            int indx = max(r - cell->rowSpan() + 1, 0);

            if (cell->overrideSize() != -1) {
                if (!statePusher.didPush()) {
                    // Technically, we should also push state for the row, but since
                    // rows don't push a coordinate transform, that's not necessary.
                    statePusher.push(this, IntSize(x(), y()));
                }
                cell->setOverrideSize(-1);
                cell->setChildNeedsLayout(true, false);
                cell->layoutIfNeeded();
            }

            int adjustedPaddingBefore = cell->paddingBefore() - cell->intrinsicPaddingBefore();
            int adjustedPaddingAfter = cell->paddingAfter() - cell->intrinsicPaddingAfter();
            int adjustedLogicalHeight = cell->logicalHeight() - (cell->intrinsicPaddingBefore() + cell->intrinsicPaddingAfter());

            // Explicit heights use the border box in quirks mode.  In strict mode do the right
            // thing and actually add in the border and padding.
            ch = cell->style()->logicalHeight().calcValue(0) + 
                (document()->inQuirksMode() ? 0 : (adjustedPaddingBefore + adjustedPaddingAfter +
                                                   cell->borderBefore() + cell->borderAfter()));
            ch = max(ch, adjustedLogicalHeight);

            pos = m_rowPos[indx] + ch + (m_grid[r].rowRenderer ? spacing : 0);

            m_rowPos[r + 1] = max(m_rowPos[r + 1], pos);

            // find out the baseline
            EVerticalAlign va = cell->style()->verticalAlign();
            if (va == BASELINE || va == TEXT_BOTTOM || va == TEXT_TOP || va == SUPER || va == SUB) {
                int b = cell->baselinePosition();
                if (b > cell->borderBefore() + cell->paddingBefore()) {
                    baseline = max(baseline, b - cell->intrinsicPaddingBefore());
                    bdesc = max(bdesc, m_rowPos[indx] + ch - (b - cell->intrinsicPaddingBefore()));
                }
            }
        }

        // do we have baseline aligned elements?
        if (baseline) {
            // increase rowheight if baseline requires
            m_rowPos[r + 1] = max(m_rowPos[r + 1], baseline + bdesc + (m_grid[r].rowRenderer ? spacing : 0));
            m_grid[r].baseline = baseline;
        }

        m_rowPos[r + 1] = max(m_rowPos[r + 1], m_rowPos[r]);
    }

#ifndef NDEBUG
    setNeedsLayoutIsForbidden(false);
#endif

    ASSERT(!needsLayout());

    statePusher.pop();

    return m_rowPos[m_gridRows];
}

void RenderTableSection::layout()
{
    ASSERT(needsLayout());

    LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), style()->isFlippedBlocksWritingMode());
    for (RenderObject* child = children()->firstChild(); child; child = child->nextSibling()) {
        if (child->isTableRow()) {
            child->layoutIfNeeded();
            ASSERT(!child->needsLayout());
        }
    }
    statePusher.pop();
    setNeedsLayout(false);
}

int RenderTableSection::layoutRows(int toAdd)
{
#ifndef NDEBUG
    setNeedsLayoutIsForbidden(true);
#endif

    ASSERT(!needsLayout());

    int rHeight;
    int rindx;
    int totalRows = m_gridRows;
    
    // Set the width of our section now.  The rows will also be this width.
    setLogicalWidth(table()->contentLogicalWidth());
    m_overflow.clear();
    m_hasOverflowingCell = false;

    if (toAdd && totalRows && (m_rowPos[totalRows] || !nextSibling())) {
        int totalHeight = m_rowPos[totalRows] + toAdd;

        int dh = toAdd;
        int totalPercent = 0;
        int numAuto = 0;
        for (int r = 0; r < totalRows; r++) {
            if (m_grid[r].logicalHeight.isAuto())
                numAuto++;
            else if (m_grid[r].logicalHeight.isPercent())
                totalPercent += m_grid[r].logicalHeight.rawValue();
        }
        if (totalPercent) {
            // try to satisfy percent
            int add = 0;
            totalPercent = min(totalPercent, 100 * percentScaleFactor);
            int rh = m_rowPos[1] - m_rowPos[0];
            for (int r = 0; r < totalRows; r++) {
                if (totalPercent > 0 && m_grid[r].logicalHeight.isPercent()) {
                    int toAdd = min(dh, (totalHeight * m_grid[r].logicalHeight.rawValue() / (100 * percentScaleFactor)) - rh);
                    // If toAdd is negative, then we don't want to shrink the row (this bug
                    // affected Outlook Web Access).
                    toAdd = max(0, toAdd);
                    add += toAdd;
                    dh -= toAdd;
                    totalPercent -= m_grid[r].logicalHeight.rawValue();
                }
                if (r < totalRows - 1)
                    rh = m_rowPos[r + 2] - m_rowPos[r + 1];
                m_rowPos[r + 1] += add;
            }
        }
        if (numAuto) {
            // distribute over variable cols
            int add = 0;
            for (int r = 0; r < totalRows; r++) {
                if (numAuto > 0 && m_grid[r].logicalHeight.isAuto()) {
                    int toAdd = dh / numAuto;
                    add += toAdd;
                    dh -= toAdd;
                    numAuto--;
                }
                m_rowPos[r + 1] += add;
            }
        }
        if (dh > 0 && m_rowPos[totalRows]) {
            // if some left overs, distribute equally.
            int tot = m_rowPos[totalRows];
            int add = 0;
            int prev = m_rowPos[0];
            for (int r = 0; r < totalRows; r++) {
                // weight with the original height
                add += dh * (m_rowPos[r + 1] - prev) / tot;
                prev = m_rowPos[r + 1];
                m_rowPos[r + 1] += add;
            }
        }
    }

    int hspacing = table()->hBorderSpacing();
    int vspacing = table()->vBorderSpacing();
    int nEffCols = table()->numEffCols();

    LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), style()->isFlippedBlocksWritingMode());

    for (int r = 0; r < totalRows; r++) {
        // Set the row's x/y position and width/height.
        if (RenderTableRow* rowRenderer = m_grid[r].rowRenderer) {
            rowRenderer->setLocation(0, m_rowPos[r]);
            rowRenderer->setLogicalWidth(logicalWidth());
            rowRenderer->setLogicalHeight(m_rowPos[r + 1] - m_rowPos[r] - vspacing);
            rowRenderer->updateLayerTransform();
        }

        for (int c = 0; c < nEffCols; c++) {
            CellStruct& cs = cellAt(r, c);
            RenderTableCell* cell = cs.primaryCell();

            if (!cell || cs.inColSpan)
                continue;

            rindx = cell->row();
            rHeight = m_rowPos[rindx + cell->rowSpan()] - m_rowPos[rindx] - vspacing;
            
            // Force percent height children to lay themselves out again.
            // This will cause these children to grow to fill the cell.
            // FIXME: There is still more work to do here to fully match WinIE (should
            // it become necessary to do so).  In quirks mode, WinIE behaves like we
            // do, but it will clip the cells that spill out of the table section.  In
            // strict mode, Mozilla and WinIE both regrow the table to accommodate the
            // new height of the cell (thus letting the percentages cause growth one
            // time only).  We may also not be handling row-spanning cells correctly.
            //
            // Note also the oddity where replaced elements always flex, and yet blocks/tables do
            // not necessarily flex.  WinIE is crazy and inconsistent, and we can't hope to
            // match the behavior perfectly, but we'll continue to refine it as we discover new
            // bugs. :)
            bool cellChildrenFlex = false;
            bool flexAllChildren = cell->style()->logicalHeight().isFixed()
                || (!table()->style()->logicalHeight().isAuto() && rHeight != cell->logicalHeight());

            for (RenderObject* o = cell->firstChild(); o; o = o->nextSibling()) {
                if (!o->isText() && o->style()->logicalHeight().isPercent() && (flexAllChildren || o->isReplaced() || (o->isBox() && toRenderBox(o)->scrollsOverflow()))) {
                    // Tables with no sections do not flex.
                    if (!o->isTable() || toRenderTable(o)->hasSections()) {
                        o->setNeedsLayout(true, false);
                        cellChildrenFlex = true;
                    }
                }
            }

            if (HashSet<RenderBox*>* percentHeightDescendants = cell->percentHeightDescendants()) {
                HashSet<RenderBox*>::iterator end = percentHeightDescendants->end();
                for (HashSet<RenderBox*>::iterator it = percentHeightDescendants->begin(); it != end; ++it) {
                    RenderBox* box = *it;
                    if (!box->isReplaced() && !box->scrollsOverflow() && !flexAllChildren)
                        continue;

                    while (box != cell) {
                        if (box->normalChildNeedsLayout())
                            break;
                        box->setChildNeedsLayout(true, false);
                        box = box->containingBlock();
                        ASSERT(box);
                        if (!box)
                            break;
                    }
                    cellChildrenFlex = true;
                }
            }

            if (cellChildrenFlex) {
                cell->setChildNeedsLayout(true, false);
                // Alignment within a cell is based off the calculated
                // height, which becomes irrelevant once the cell has
                // been resized based off its percentage.
                cell->setOverrideSize(max(0, 
                                           rHeight - cell->borderBefore() - cell->paddingBefore() - 
                                                     cell->borderAfter() - cell->paddingAfter()));
                cell->layoutIfNeeded();

                // If the baseline moved, we may have to update the data for our row. Find out the new baseline.
                EVerticalAlign va = cell->style()->verticalAlign();
                if (va == BASELINE || va == TEXT_BOTTOM || va == TEXT_TOP || va == SUPER || va == SUB) {
                    int b = cell->baselinePosition();
                    if (b > cell->borderBefore() + cell->paddingBefore())
                        m_grid[r].baseline = max(m_grid[r].baseline, b);
                }
            }

            int oldIntrinsicPaddingBefore = cell->intrinsicPaddingBefore();
            int oldIntrinsicPaddingAfter = cell->intrinsicPaddingAfter();
            int logicalHeightWithoutIntrinsicPadding = cell->logicalHeight() - oldIntrinsicPaddingBefore - oldIntrinsicPaddingAfter;

            int intrinsicPaddingBefore = 0;
            switch (cell->style()->verticalAlign()) {
                case SUB:
                case SUPER:
                case TEXT_TOP:
                case TEXT_BOTTOM:
                case BASELINE: {
                    int b = cell->baselinePosition();
                    if (b > cell->borderBefore() + cell->paddingBefore())
                        intrinsicPaddingBefore = getBaseline(r) - (b - oldIntrinsicPaddingBefore);
                    break;
                }
                case TOP:
                    break;
                case MIDDLE:
                    intrinsicPaddingBefore = (rHeight - logicalHeightWithoutIntrinsicPadding) / 2;
                    break;
                case BOTTOM:
                    intrinsicPaddingBefore = rHeight - logicalHeightWithoutIntrinsicPadding;
                    break;
                default:
                    break;
            }
            
            int intrinsicPaddingAfter = rHeight - logicalHeightWithoutIntrinsicPadding - intrinsicPaddingBefore;
            cell->setIntrinsicPaddingBefore(intrinsicPaddingBefore);
            cell->setIntrinsicPaddingAfter(intrinsicPaddingAfter);

            IntRect oldCellRect(cell->x(), cell->y() , cell->width(), cell->height());

            if (!style()->isLeftToRightDirection())
                cell->setLogicalLocation(table()->columnPositions()[nEffCols] - table()->columnPositions()[table()->colToEffCol(cell->col() + cell->colSpan())] + hspacing, m_rowPos[rindx]);
            else
                cell->setLogicalLocation(table()->columnPositions()[c] + hspacing, m_rowPos[rindx]);
            view()->addLayoutDelta(IntSize(oldCellRect.x() - cell->x(), oldCellRect.y() - cell->y()));

            if (intrinsicPaddingBefore != oldIntrinsicPaddingBefore || intrinsicPaddingAfter != oldIntrinsicPaddingAfter)
                cell->setNeedsLayout(true, false);

            if (!cell->needsLayout() && view()->layoutState()->pageLogicalHeight() && view()->layoutState()->pageLogicalOffset(cell->y()) != cell->pageLogicalOffset())
                cell->setChildNeedsLayout(true, false);

            cell->layoutIfNeeded();

            // FIXME: Make pagination work with vertical tables.
            if (style()->isHorizontalWritingMode() && view()->layoutState()->pageLogicalHeight() && cell->height() != rHeight)
                cell->setHeight(rHeight); // FIXME: Pagination might have made us change size.  For now just shrink or grow the cell to fit without doing a relayout.

            IntSize childOffset(cell->x() - oldCellRect.x(), cell->y() - oldCellRect.y());
            if (childOffset.width() || childOffset.height()) {
                view()->addLayoutDelta(childOffset);

                // If the child moved, we have to repaint it as well as any floating/positioned
                // descendants.  An exception is if we need a layout.  In this case, we know we're going to
                // repaint ourselves (and the child) anyway.
                if (!table()->selfNeedsLayout() && cell->checkForRepaintDuringLayout())
                    cell->repaintDuringLayoutIfMoved(oldCellRect);
            }
        }
    }

#ifndef NDEBUG
    setNeedsLayoutIsForbidden(false);
#endif

    ASSERT(!needsLayout());

    setLogicalHeight(m_rowPos[totalRows]);

    // Now that our height has been determined, add in overflow from cells.
    for (int r = 0; r < totalRows; r++) {
        for (int c = 0; c < nEffCols; c++) {
            CellStruct& cs = cellAt(r, c);
            RenderTableCell* cell = cs.primaryCell();
            if (!cell || cs.inColSpan)
                continue;
            if (r < totalRows - 1 && cell == primaryCellAt(r + 1, c))
                continue;
            addOverflowFromChild(cell);
            m_hasOverflowingCell |= cell->hasVisualOverflow();
        }
    }

    statePusher.pop();
    return height();
}

int RenderTableSection::calcOuterBorderBefore() const
{
    int totalCols = table()->numEffCols();
    if (!m_gridRows || !totalCols)
        return 0;

    unsigned borderWidth = 0;

    const BorderValue& sb = style()->borderBefore();
    if (sb.style() == BHIDDEN)
        return -1;
    if (sb.style() > BHIDDEN)
        borderWidth = sb.width();

    const BorderValue& rb = firstChild()->style()->borderBefore();
    if (rb.style() == BHIDDEN)
        return -1;
    if (rb.style() > BHIDDEN && rb.width() > borderWidth)
        borderWidth = rb.width();

    bool allHidden = true;
    for (int c = 0; c < totalCols; c++) {
        const CellStruct& current = cellAt(0, c);
        if (current.inColSpan || !current.hasCells())
            continue;
        const BorderValue& cb = current.primaryCell()->style()->borderBefore(); // FIXME: Make this work with perpendicular and flipped cells.
        // FIXME: Don't repeat for the same col group
        RenderTableCol* colGroup = table()->colElement(c);
        if (colGroup) {
            const BorderValue& gb = colGroup->style()->borderBefore();
            if (gb.style() == BHIDDEN || cb.style() == BHIDDEN)
                continue;
            allHidden = false;
            if (gb.style() > BHIDDEN && gb.width() > borderWidth)
                borderWidth = gb.width();
            if (cb.style() > BHIDDEN && cb.width() > borderWidth)
                borderWidth = cb.width();
        } else {
            if (cb.style() == BHIDDEN)
                continue;
            allHidden = false;
            if (cb.style() > BHIDDEN && cb.width() > borderWidth)
                borderWidth = cb.width();
        }
    }
    if (allHidden)
        return -1;

    return borderWidth / 2;
}

int RenderTableSection::calcOuterBorderAfter() const
{
    int totalCols = table()->numEffCols();
    if (!m_gridRows || !totalCols)
        return 0;

    unsigned borderWidth = 0;

    const BorderValue& sb = style()->borderAfter();
    if (sb.style() == BHIDDEN)
        return -1;
    if (sb.style() > BHIDDEN)
        borderWidth = sb.width();

    const BorderValue& rb = lastChild()->style()->borderAfter();
    if (rb.style() == BHIDDEN)
        return -1;
    if (rb.style() > BHIDDEN && rb.width() > borderWidth)
        borderWidth = rb.width();

    bool allHidden = true;
    for (int c = 0; c < totalCols; c++) {
        const CellStruct& current = cellAt(m_gridRows - 1, c);
        if (current.inColSpan || !current.hasCells())
            continue;
        const BorderValue& cb = current.primaryCell()->style()->borderAfter(); // FIXME: Make this work with perpendicular and flipped cells.
        // FIXME: Don't repeat for the same col group
        RenderTableCol* colGroup = table()->colElement(c);
        if (colGroup) {
            const BorderValue& gb = colGroup->style()->borderAfter();
            if (gb.style() == BHIDDEN || cb.style() == BHIDDEN)
                continue;
            allHidden = false;
            if (gb.style() > BHIDDEN && gb.width() > borderWidth)
                borderWidth = gb.width();
            if (cb.style() > BHIDDEN && cb.width() > borderWidth)
                borderWidth = cb.width();
        } else {
            if (cb.style() == BHIDDEN)
                continue;
            allHidden = false;
            if (cb.style() > BHIDDEN && cb.width() > borderWidth)
                borderWidth = cb.width();
        }
    }
    if (allHidden)
        return -1;

    return (borderWidth + 1) / 2;
}

int RenderTableSection::calcOuterBorderStart() const
{
    int totalCols = table()->numEffCols();
    if (!m_gridRows || !totalCols)
        return 0;

    unsigned borderWidth = 0;

    const BorderValue& sb = style()->borderStart();
    if (sb.style() == BHIDDEN)
        return -1;
    if (sb.style() > BHIDDEN)
        borderWidth = sb.width();

    if (RenderTableCol* colGroup = table()->colElement(0)) {
        const BorderValue& gb = colGroup->style()->borderStart();
        if (gb.style() == BHIDDEN)
            return -1;
        if (gb.style() > BHIDDEN && gb.width() > borderWidth)
            borderWidth = gb.width();
    }

    bool allHidden = true;
    for (int r = 0; r < m_gridRows; r++) {
        const CellStruct& current = cellAt(r, 0);
        if (!current.hasCells())
            continue;
        // FIXME: Don't repeat for the same cell
        const BorderValue& cb = current.primaryCell()->style()->borderStart(); // FIXME: Make this work with perpendicular and flipped cells.
        const BorderValue& rb = current.primaryCell()->parent()->style()->borderStart();
        if (cb.style() == BHIDDEN || rb.style() == BHIDDEN)
            continue;
        allHidden = false;
        if (cb.style() > BHIDDEN && cb.width() > borderWidth)
            borderWidth = cb.width();
        if (rb.style() > BHIDDEN && rb.width() > borderWidth)
            borderWidth = rb.width();
    }
    if (allHidden)
        return -1;

    return (borderWidth + (table()->style()->isLeftToRightDirection() ? 0 : 1)) / 2;
}

int RenderTableSection::calcOuterBorderEnd() const
{
    int totalCols = table()->numEffCols();
    if (!m_gridRows || !totalCols)
        return 0;

    unsigned borderWidth = 0;

    const BorderValue& sb = style()->borderEnd();