Source/WebCore/rendering/RenderTableSection.h - WebKit - Git at Google

 /*
  * 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, 2009 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.
  */

 #pragma once

 #include "RenderTable.h"
 #include <wtf/Vector.h>

 namespace WebCore {

 class RenderTableCell;
 class RenderTableRow;

 enum CollapsedBorderSide {
     CBSBefore,
     CBSAfter,
     CBSStart,
     CBSEnd
 };

 // Helper class for paintObject.
 struct CellSpan {
 public:
     explicit CellSpan(unsigned start, unsigned end)
         : start(start)
         , end(end)
     {
     }

     unsigned start;
     unsigned end;
 };

 class RenderTableSection final : public RenderBox {
     WTF_MAKE_ISO_ALLOCATED(RenderTableSection);
 public:
     RenderTableSection(Element&, RenderStyle&&);
     RenderTableSection(Document&, RenderStyle&&);
     virtual ~RenderTableSection();

     RenderTableRow* firstRow() const;
     RenderTableRow* lastRow() const;

     Optional<int> firstLineBaseline() const override;

     void addCell(RenderTableCell*, RenderTableRow* row);

     LayoutUnit calcRowLogicalHeight();
     void layoutRows();
     void computeOverflowFromCells();

     RenderTable* table() const { return downcast<RenderTable>(parent()); }

     struct CellStruct {
         Vector<RenderTableCell*, 1> cells;
         bool inColSpan { false }; // true for columns after the first in a colspan

         RenderTableCell* primaryCell() { return hasCells() ? cells[cells.size() - 1] : 0; }
         const RenderTableCell* primaryCell() const { return hasCells() ? cells[cells.size() - 1] : 0; }
         bool hasCells() const { return cells.size() > 0; }
     };

     typedef Vector<CellStruct> Row;
     struct RowStruct {
         Row row;
         RenderTableRow* rowRenderer { nullptr };
         LayoutUnit baseline;
         Length logicalHeight;
     };

     const BorderValue& borderAdjoiningTableStart() const;
     const BorderValue& borderAdjoiningTableEnd() const;
     const BorderValue& borderAdjoiningStartCell(const RenderTableCell&) const;
     const BorderValue& borderAdjoiningEndCell(const RenderTableCell&) const;

     const RenderTableCell* firstRowCellAdjoiningTableStart() const;
     const RenderTableCell* firstRowCellAdjoiningTableEnd() const;

     CellStruct& cellAt(unsigned row,  unsigned col);
     const CellStruct& cellAt(unsigned row, unsigned col) const;
     RenderTableCell* primaryCellAt(unsigned row, unsigned col);
     RenderTableRow* rowRendererAt(unsigned row) const;

     void appendColumn(unsigned pos);
     void splitColumn(unsigned pos, unsigned first);

     LayoutUnit calcOuterBorderBefore() const;
     LayoutUnit calcOuterBorderAfter() const;
     LayoutUnit calcOuterBorderStart() const;
     LayoutUnit calcOuterBorderEnd() const;
     void recalcOuterBorder();

     LayoutUnit outerBorderBefore() const { return m_outerBorderBefore; }
     LayoutUnit outerBorderAfter() const { return m_outerBorderAfter; }
     LayoutUnit outerBorderStart() const { return m_outerBorderStart; }
     LayoutUnit outerBorderEnd() const { return m_outerBorderEnd; }

     LayoutUnit outerBorderLeft(const RenderStyle* styleForCellFlow) const;
     LayoutUnit outerBorderRight(const RenderStyle* styleForCellFlow) const;
     LayoutUnit outerBorderTop(const RenderStyle* styleForCellFlow) const;
     LayoutUnit outerBorderBottom(const RenderStyle* styleForCellFlow) const;

     unsigned numRows() const;
     unsigned numColumns() const;
     void recalcCells();
     void recalcCellsIfNeeded();
     void removeRedundantColumns();

     bool needsCellRecalc() const { return m_needsCellRecalc; }
     void setNeedsCellRecalc();

     LayoutUnit rowBaseline(unsigned row);
     void rowLogicalHeightChanged(unsigned rowIndex);

     void clearCachedCollapsedBorders();
     void removeCachedCollapsedBorders(const RenderTableCell&);
     void setCachedCollapsedBorder(const RenderTableCell&, CollapsedBorderSide, CollapsedBorderValue);
     CollapsedBorderValue cachedCollapsedBorder(const RenderTableCell&, CollapsedBorderSide);

     // distributeExtraLogicalHeightToRows methods return the *consumed* extra logical height.
     // FIXME: We may want to introduce a structure holding the in-flux layout information.
     LayoutUnit distributeExtraLogicalHeightToRows(LayoutUnit extraLogicalHeight);

     static RenderPtr<RenderTableSection> createAnonymousWithParentRenderer(const RenderTable&);
     RenderPtr<RenderBox> createAnonymousBoxWithSameTypeAs(const RenderBox&) const override;

     void paint(PaintInfo&, const LayoutPoint&) override;

     void willInsertTableRow(RenderTableRow& child, RenderObject* beforeChild);

 private:
     void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;

     static RenderPtr<RenderTableSection> createTableSectionWithStyle(Document&, const RenderStyle&);

     enum ShouldIncludeAllIntersectingCells {
         IncludeAllIntersectingCells,
         DoNotIncludeAllIntersectingCells
     };

     const char* renderName() const override { return (isAnonymous() || isPseudoElement()) ? "RenderTableSection (anonymous)" : "RenderTableSection"; }

     bool canHaveChildren() const override { return true; }

     bool isTableSection() const override { return true; }

     void willBeRemovedFromTree() override;

     void layout() override;

     void paintCell(RenderTableCell*, PaintInfo&, const LayoutPoint&);
     void paintObject(PaintInfo&, const LayoutPoint&) override;
     void paintRowGroupBorder(const PaintInfo&, bool antialias, LayoutRect, BoxSide, CSSPropertyID borderColor, BorderStyle, BorderStyle tableBorderStyle);
     void paintRowGroupBorderIfRequired(const PaintInfo&, const LayoutPoint& paintOffset, unsigned row, unsigned col, BoxSide, RenderTableCell* = 0);
     LayoutUnit offsetLeftForRowGroupBorder(RenderTableCell*, const LayoutRect& rowGroupRect, unsigned row);

     LayoutUnit offsetTopForRowGroupBorder(RenderTableCell*, BoxSide borderSide, unsigned row);
     LayoutUnit verticalRowGroupBorderHeight(RenderTableCell*, const LayoutRect& rowGroupRect, unsigned row);
     LayoutUnit horizontalRowGroupBorderWidth(RenderTableCell*, const LayoutRect& rowGroupRect, unsigned row, unsigned column);

     void imageChanged(WrappedImagePtr, const IntRect* = 0) override;

     bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;

     void ensureRows(unsigned);

     void relayoutCellIfFlexed(RenderTableCell&, int rowIndex, int rowHeight);

     void distributeExtraLogicalHeightToPercentRows(LayoutUnit& extraLogicalHeight, int totalPercent);
     void distributeExtraLogicalHeightToAutoRows(LayoutUnit& extraLogicalHeight, unsigned autoRowsCount);
     void distributeRemainingExtraLogicalHeight(LayoutUnit& extraLogicalHeight);

     bool hasOverflowingCell() const { return m_overflowingCells.size() || m_forceSlowPaintPathWithOverflowingCell; }
     void computeOverflowFromCells(unsigned totalRows, unsigned nEffCols);

     CellSpan fullTableRowSpan() const;
     CellSpan fullTableColumnSpan() const { return CellSpan(0, table()->columns().size()); }

     // Flip the rect so it aligns with the coordinates used by the rowPos and columnPos vectors.
     LayoutRect logicalRectForWritingModeAndDirection(const LayoutRect&) const;

     CellSpan dirtiedRows(const LayoutRect& repaintRect) const;
     CellSpan dirtiedColumns(const LayoutRect& repaintRect) const;

     // These two functions take a rectangle as input that has been flipped by logicalRectForWritingModeAndDirection.
     // The returned span of rows or columns is end-exclusive, and empty if start==end.
     // The IncludeAllIntersectingCells argument is used to determine which cells to include when
     // an edge of the flippedRect lies exactly on a cell boundary. Using IncludeAllIntersectingCells
     // will return both cells, and using DoNotIncludeAllIntersectingCells will return only the cell
     // that hittesting should return.
     CellSpan spannedRows(const LayoutRect& flippedRect, ShouldIncludeAllIntersectingCells) const;
     CellSpan spannedColumns(const LayoutRect& flippedRect, ShouldIncludeAllIntersectingCells) const;

     void setLogicalPositionForCell(RenderTableCell*, unsigned effectiveColumn) const;

     void firstChild() const = delete;
     void lastChild() const = delete;

     Vector<RowStruct> m_grid;
     Vector<LayoutUnit> m_rowPos;

     // the current insertion position
     unsigned m_cCol { 0 };
     unsigned m_cRow  { 0 };

     LayoutUnit m_outerBorderStart;
     LayoutUnit m_outerBorderEnd;
     LayoutUnit m_outerBorderBefore;
     LayoutUnit m_outerBorderAfter;

     // This HashSet holds the overflowing cells for faster painting.
     // If we have more than gMaxAllowedOverflowingCellRatio * total cells, it will be empty
     // and m_forceSlowPaintPathWithOverflowingCell will be set to save memory.
     HashSet<RenderTableCell*> m_overflowingCells;

     // This map holds the collapsed border values for cells with collapsed borders.
     // It is held at RenderTableSection level to spare memory consumption by table cells.
     HashMap<std::pair<const RenderTableCell*, int>, CollapsedBorderValue > m_cellsCollapsedBorders;

     bool m_forceSlowPaintPathWithOverflowingCell { false };
     bool m_hasMultipleCellLevels { false };
     bool m_needsCellRecalc  { false };
 };

 inline const BorderValue& RenderTableSection::borderAdjoiningTableStart() const
 {
     if (isDirectionSame(this, table()))
         return style().borderStart();
     return style().borderEnd();
 }

 inline const BorderValue& RenderTableSection::borderAdjoiningTableEnd() const
 {
     if (isDirectionSame(this, table()))
         return style().borderEnd();
     return style().borderStart();
 }

 inline RenderTableSection::CellStruct& RenderTableSection::cellAt(unsigned row,  unsigned col)
 {
     recalcCellsIfNeeded();
     return m_grid[row].row[col];
 }

 inline const RenderTableSection::CellStruct& RenderTableSection::cellAt(unsigned row, unsigned col) const
 {
     ASSERT(!m_needsCellRecalc);
     return m_grid[row].row[col];
 }

 inline RenderTableCell* RenderTableSection::primaryCellAt(unsigned row, unsigned col)
 {
     recalcCellsIfNeeded();
     CellStruct& c = m_grid[row].row[col];
     return c.primaryCell();
 }

 inline RenderTableRow* RenderTableSection::rowRendererAt(unsigned row) const
 {
     ASSERT(!m_needsCellRecalc);
     return m_grid[row].rowRenderer;
 }

 inline LayoutUnit RenderTableSection::outerBorderLeft(const RenderStyle* styleForCellFlow) const
 {
     if (styleForCellFlow->isHorizontalWritingMode())
         return styleForCellFlow->isLeftToRightDirection() ? outerBorderStart() : outerBorderEnd();
     return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderAfter() : outerBorderBefore();
 }

 inline LayoutUnit RenderTableSection::outerBorderRight(const RenderStyle* styleForCellFlow) const
 {
     if (styleForCellFlow->isHorizontalWritingMode())
         return styleForCellFlow->isLeftToRightDirection() ? outerBorderEnd() : outerBorderStart();
     return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderBefore() : outerBorderAfter();
 }

 inline LayoutUnit RenderTableSection::outerBorderTop(const RenderStyle* styleForCellFlow) const
 {
     if (styleForCellFlow->isHorizontalWritingMode())
         return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderAfter() : outerBorderBefore();
     return styleForCellFlow->isLeftToRightDirection() ? outerBorderStart() : outerBorderEnd();
 }

 inline LayoutUnit RenderTableSection::outerBorderBottom(const RenderStyle* styleForCellFlow) const
 {
     if (styleForCellFlow->isHorizontalWritingMode())
         return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderBefore() : outerBorderAfter();
     return styleForCellFlow->isLeftToRightDirection() ? outerBorderEnd() : outerBorderStart();
 }

 inline unsigned RenderTableSection::numRows() const
 {
     ASSERT(!m_needsCellRecalc);
     return m_grid.size();
 }

 inline void RenderTableSection::recalcCellsIfNeeded()
 {
     if (m_needsCellRecalc)
         recalcCells();
 }

 inline LayoutUnit RenderTableSection::rowBaseline(unsigned row)
 {
     recalcCellsIfNeeded();
     return m_grid[row].baseline;
 }

 inline CellSpan RenderTableSection::fullTableRowSpan() const
 {
     ASSERT(!m_needsCellRecalc);
     return CellSpan(0, m_grid.size());
 }

 inline RenderPtr<RenderBox> RenderTableSection::createAnonymousBoxWithSameTypeAs(const RenderBox& renderer) const
 {
     return RenderTableSection::createTableSectionWithStyle(renderer.document(), renderer.style());
 }

 } // namespace WebCore

 SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderTableSection, isTableSection())
	/*
	* 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, 2009 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.
	*/

	#pragma once

	#include "RenderTable.h"
	#include <wtf/Vector.h>

	namespace WebCore {

	class RenderTableCell;
	class RenderTableRow;

	enum CollapsedBorderSide {
	CBSBefore,
	CBSAfter,
	CBSStart,
	CBSEnd
	};

	// Helper class for paintObject.
	struct CellSpan {
	public:
	explicit CellSpan(unsigned start, unsigned end)
	: start(start)
	, end(end)
	{
	}

	unsigned start;
	unsigned end;
	};

	class RenderTableSection final : public RenderBox {
	WTF_MAKE_ISO_ALLOCATED(RenderTableSection);
	public:
	RenderTableSection(Element&, RenderStyle&&);
	RenderTableSection(Document&, RenderStyle&&);
	virtual ~RenderTableSection();

	RenderTableRow* firstRow() const;
	RenderTableRow* lastRow() const;

	Optional<int> firstLineBaseline() const override;

	void addCell(RenderTableCell, RenderTableRow row);

	LayoutUnit calcRowLogicalHeight();
	void layoutRows();
	void computeOverflowFromCells();

	RenderTable* table() const { return downcast<RenderTable>(parent()); }

	struct CellStruct {
	Vector<RenderTableCell*, 1> cells;
	bool inColSpan { false }; // true for columns after the first in a colspan

	RenderTableCell* primaryCell() { return hasCells() ? cells[cells.size() - 1] : 0; }
	const RenderTableCell* primaryCell() const { return hasCells() ? cells[cells.size() - 1] : 0; }
	bool hasCells() const { return cells.size() > 0; }
	};

	typedef Vector<CellStruct> Row;
	struct RowStruct {
	Row row;
	RenderTableRow* rowRenderer { nullptr };
	LayoutUnit baseline;
	Length logicalHeight;
	};

	const BorderValue& borderAdjoiningTableStart() const;
	const BorderValue& borderAdjoiningTableEnd() const;
	const BorderValue& borderAdjoiningStartCell(const RenderTableCell&) const;
	const BorderValue& borderAdjoiningEndCell(const RenderTableCell&) const;

	const RenderTableCell* firstRowCellAdjoiningTableStart() const;
	const RenderTableCell* firstRowCellAdjoiningTableEnd() const;

	CellStruct& cellAt(unsigned row, unsigned col);
	const CellStruct& cellAt(unsigned row, unsigned col) const;
	RenderTableCell* primaryCellAt(unsigned row, unsigned col);
	RenderTableRow* rowRendererAt(unsigned row) const;

	void appendColumn(unsigned pos);
	void splitColumn(unsigned pos, unsigned first);

	LayoutUnit calcOuterBorderBefore() const;
	LayoutUnit calcOuterBorderAfter() const;
	LayoutUnit calcOuterBorderStart() const;
	LayoutUnit calcOuterBorderEnd() const;
	void recalcOuterBorder();

	LayoutUnit outerBorderBefore() const { return m_outerBorderBefore; }
	LayoutUnit outerBorderAfter() const { return m_outerBorderAfter; }
	LayoutUnit outerBorderStart() const { return m_outerBorderStart; }
	LayoutUnit outerBorderEnd() const { return m_outerBorderEnd; }

	LayoutUnit outerBorderLeft(const RenderStyle* styleForCellFlow) const;
	LayoutUnit outerBorderRight(const RenderStyle* styleForCellFlow) const;
	LayoutUnit outerBorderTop(const RenderStyle* styleForCellFlow) const;
	LayoutUnit outerBorderBottom(const RenderStyle* styleForCellFlow) const;

	unsigned numRows() const;
	unsigned numColumns() const;
	void recalcCells();
	void recalcCellsIfNeeded();
	void removeRedundantColumns();

	bool needsCellRecalc() const { return m_needsCellRecalc; }
	void setNeedsCellRecalc();

	LayoutUnit rowBaseline(unsigned row);
	void rowLogicalHeightChanged(unsigned rowIndex);

	void clearCachedCollapsedBorders();
	void removeCachedCollapsedBorders(const RenderTableCell&);
	void setCachedCollapsedBorder(const RenderTableCell&, CollapsedBorderSide, CollapsedBorderValue);
	CollapsedBorderValue cachedCollapsedBorder(const RenderTableCell&, CollapsedBorderSide);

	// distributeExtraLogicalHeightToRows methods return the consumed extra logical height.
	// FIXME: We may want to introduce a structure holding the in-flux layout information.
	LayoutUnit distributeExtraLogicalHeightToRows(LayoutUnit extraLogicalHeight);

	static RenderPtr<RenderTableSection> createAnonymousWithParentRenderer(const RenderTable&);
	RenderPtr<RenderBox> createAnonymousBoxWithSameTypeAs(const RenderBox&) const override;

	void paint(PaintInfo&, const LayoutPoint&) override;

	void willInsertTableRow(RenderTableRow& child, RenderObject* beforeChild);

	private:
	void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;

	static RenderPtr<RenderTableSection> createTableSectionWithStyle(Document&, const RenderStyle&);

	enum ShouldIncludeAllIntersectingCells {
	IncludeAllIntersectingCells,
	DoNotIncludeAllIntersectingCells
	};

	const char* renderName() const override { return (isAnonymous() \|\| isPseudoElement()) ? "RenderTableSection (anonymous)" : "RenderTableSection"; }

	bool canHaveChildren() const override { return true; }

	bool isTableSection() const override { return true; }

	void willBeRemovedFromTree() override;

	void layout() override;

	void paintCell(RenderTableCell*, PaintInfo&, const LayoutPoint&);
	void paintObject(PaintInfo&, const LayoutPoint&) override;
	void paintRowGroupBorder(const PaintInfo&, bool antialias, LayoutRect, BoxSide, CSSPropertyID borderColor, BorderStyle, BorderStyle tableBorderStyle);
	void paintRowGroupBorderIfRequired(const PaintInfo&, const LayoutPoint& paintOffset, unsigned row, unsigned col, BoxSide, RenderTableCell* = 0);
	LayoutUnit offsetLeftForRowGroupBorder(RenderTableCell*, const LayoutRect& rowGroupRect, unsigned row);

	LayoutUnit offsetTopForRowGroupBorder(RenderTableCell*, BoxSide borderSide, unsigned row);
	LayoutUnit verticalRowGroupBorderHeight(RenderTableCell*, const LayoutRect& rowGroupRect, unsigned row);
	LayoutUnit horizontalRowGroupBorderWidth(RenderTableCell*, const LayoutRect& rowGroupRect, unsigned row, unsigned column);

	void imageChanged(WrappedImagePtr, const IntRect* = 0) override;

	bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;

	void ensureRows(unsigned);

	void relayoutCellIfFlexed(RenderTableCell&, int rowIndex, int rowHeight);

	void distributeExtraLogicalHeightToPercentRows(LayoutUnit& extraLogicalHeight, int totalPercent);
	void distributeExtraLogicalHeightToAutoRows(LayoutUnit& extraLogicalHeight, unsigned autoRowsCount);
	void distributeRemainingExtraLogicalHeight(LayoutUnit& extraLogicalHeight);

	bool hasOverflowingCell() const { return m_overflowingCells.size() \|\| m_forceSlowPaintPathWithOverflowingCell; }
	void computeOverflowFromCells(unsigned totalRows, unsigned nEffCols);

	CellSpan fullTableRowSpan() const;
	CellSpan fullTableColumnSpan() const { return CellSpan(0, table()->columns().size()); }

	// Flip the rect so it aligns with the coordinates used by the rowPos and columnPos vectors.
	LayoutRect logicalRectForWritingModeAndDirection(const LayoutRect&) const;

	CellSpan dirtiedRows(const LayoutRect& repaintRect) const;
	CellSpan dirtiedColumns(const LayoutRect& repaintRect) const;

	// These two functions take a rectangle as input that has been flipped by logicalRectForWritingModeAndDirection.
	// The returned span of rows or columns is end-exclusive, and empty if start==end.
	// The IncludeAllIntersectingCells argument is used to determine which cells to include when
	// an edge of the flippedRect lies exactly on a cell boundary. Using IncludeAllIntersectingCells
	// will return both cells, and using DoNotIncludeAllIntersectingCells will return only the cell
	// that hittesting should return.
	CellSpan spannedRows(const LayoutRect& flippedRect, ShouldIncludeAllIntersectingCells) const;
	CellSpan spannedColumns(const LayoutRect& flippedRect, ShouldIncludeAllIntersectingCells) const;

	void setLogicalPositionForCell(RenderTableCell*, unsigned effectiveColumn) const;

	void firstChild() const = delete;
	void lastChild() const = delete;

	Vector<RowStruct> m_grid;
	Vector<LayoutUnit> m_rowPos;

	// the current insertion position
	unsigned m_cCol { 0 };
	unsigned m_cRow { 0 };

	LayoutUnit m_outerBorderStart;
	LayoutUnit m_outerBorderEnd;
	LayoutUnit m_outerBorderBefore;
	LayoutUnit m_outerBorderAfter;

	// This HashSet holds the overflowing cells for faster painting.
	// If we have more than gMaxAllowedOverflowingCellRatio * total cells, it will be empty
	// and m_forceSlowPaintPathWithOverflowingCell will be set to save memory.
	HashSet<RenderTableCell*> m_overflowingCells;

	// This map holds the collapsed border values for cells with collapsed borders.
	// It is held at RenderTableSection level to spare memory consumption by table cells.
	HashMap<std::pair<const RenderTableCell*, int>, CollapsedBorderValue > m_cellsCollapsedBorders;

	bool m_forceSlowPaintPathWithOverflowingCell { false };
	bool m_hasMultipleCellLevels { false };
	bool m_needsCellRecalc { false };
	};

	inline const BorderValue& RenderTableSection::borderAdjoiningTableStart() const
	{
	if (isDirectionSame(this, table()))
	return style().borderStart();
	return style().borderEnd();
	}

	inline const BorderValue& RenderTableSection::borderAdjoiningTableEnd() const
	{
	if (isDirectionSame(this, table()))
	return style().borderEnd();
	return style().borderStart();
	}

	inline RenderTableSection::CellStruct& RenderTableSection::cellAt(unsigned row, unsigned col)
	{
	recalcCellsIfNeeded();
	return m_grid[row].row[col];
	}

	inline const RenderTableSection::CellStruct& RenderTableSection::cellAt(unsigned row, unsigned col) const
	{
	ASSERT(!m_needsCellRecalc);
	return m_grid[row].row[col];
	}

	inline RenderTableCell* RenderTableSection::primaryCellAt(unsigned row, unsigned col)
	{
	recalcCellsIfNeeded();
	CellStruct& c = m_grid[row].row[col];
	return c.primaryCell();
	}

	inline RenderTableRow* RenderTableSection::rowRendererAt(unsigned row) const
	{
	ASSERT(!m_needsCellRecalc);
	return m_grid[row].rowRenderer;
	}

	inline LayoutUnit RenderTableSection::outerBorderLeft(const RenderStyle* styleForCellFlow) const
	{
	if (styleForCellFlow->isHorizontalWritingMode())
	return styleForCellFlow->isLeftToRightDirection() ? outerBorderStart() : outerBorderEnd();
	return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderAfter() : outerBorderBefore();
	}

	inline LayoutUnit RenderTableSection::outerBorderRight(const RenderStyle* styleForCellFlow) const
	{
	if (styleForCellFlow->isHorizontalWritingMode())
	return styleForCellFlow->isLeftToRightDirection() ? outerBorderEnd() : outerBorderStart();
	return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderBefore() : outerBorderAfter();
	}

	inline LayoutUnit RenderTableSection::outerBorderTop(const RenderStyle* styleForCellFlow) const
	{
	if (styleForCellFlow->isHorizontalWritingMode())
	return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderAfter() : outerBorderBefore();
	return styleForCellFlow->isLeftToRightDirection() ? outerBorderStart() : outerBorderEnd();
	}

	inline LayoutUnit RenderTableSection::outerBorderBottom(const RenderStyle* styleForCellFlow) const
	{
	if (styleForCellFlow->isHorizontalWritingMode())
	return styleForCellFlow->isFlippedBlocksWritingMode() ? outerBorderBefore() : outerBorderAfter();
	return styleForCellFlow->isLeftToRightDirection() ? outerBorderEnd() : outerBorderStart();
	}

	inline unsigned RenderTableSection::numRows() const
	{
	ASSERT(!m_needsCellRecalc);
	return m_grid.size();
	}

	inline void RenderTableSection::recalcCellsIfNeeded()
	{
	if (m_needsCellRecalc)
	recalcCells();
	}

	inline LayoutUnit RenderTableSection::rowBaseline(unsigned row)
	{
	recalcCellsIfNeeded();
	return m_grid[row].baseline;
	}

	inline CellSpan RenderTableSection::fullTableRowSpan() const
	{
	ASSERT(!m_needsCellRecalc);
	return CellSpan(0, m_grid.size());
	}

	inline RenderPtr<RenderBox> RenderTableSection::createAnonymousBoxWithSameTypeAs(const RenderBox& renderer) const
	{
	return RenderTableSection::createTableSectionWithStyle(renderer.document(), renderer.style());
	}

	} // namespace WebCore

	SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderTableSection, isTableSection())