Source/core/rendering/RenderTableCell.h - chromium/blink - 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, 2007, 2009, 2013 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.
  */

 #ifndef RenderTableCell_h
 #define RenderTableCell_h

 #include "core/rendering/RenderBlockFlow.h"
 #include "core/rendering/RenderTableRow.h"
 #include "core/rendering/RenderTableSection.h"
 #include "platform/LengthFunctions.h"

 namespace blink {

 static const unsigned unsetColumnIndex = 0x1FFFFFFF;
 static const unsigned maxColumnIndex = 0x1FFFFFFE; // 536,870,910

 enum IncludeBorderColorOrNot { DoNotIncludeBorderColor, IncludeBorderColor };

 class SubtreeLayoutScope;

 class RenderTableCell final : public RenderBlockFlow {
 public:
     explicit RenderTableCell(Element*);

     unsigned colSpan() const
     {
         if (!m_hasColSpan)
             return 1;
         return parseColSpanFromDOM();
     }
     unsigned rowSpan() const
     {
         if (!m_hasRowSpan)
             return 1;
         return parseRowSpanFromDOM();
     }

     // Called from HTMLTableCellElement.
     void colSpanOrRowSpanChanged();

     void setCol(unsigned column)
     {
         if (UNLIKELY(column > maxColumnIndex))
             CRASH();

         m_column = column;
     }

     unsigned col() const
     {
         ASSERT(m_column != unsetColumnIndex);
         return m_column;
     }

     RenderTableRow* row() const { return toRenderTableRow(parent()); }
     RenderTableSection* section() const { return toRenderTableSection(parent()->parent()); }
     RenderTable* table() const { return toRenderTable(parent()->parent()->parent()); }

     RenderTableCell* previousCell() const;
     RenderTableCell* nextCell() const;

     unsigned rowIndex() const
     {
         // This function shouldn't be called on a detached cell.
         ASSERT(row());
         return row()->rowIndex();
     }

     Length styleOrColLogicalWidth() const
     {
         Length styleWidth = style()->logicalWidth();
         if (!styleWidth.isAuto())
             return styleWidth;
         if (RenderTableCol* firstColumn = table()->colElement(col()))
             return logicalWidthFromColumns(firstColumn, styleWidth);
         return styleWidth;
     }

     int logicalHeightForRowSizing() const
     {
         // FIXME: This function does too much work, and is very hot during table layout!
         int adjustedLogicalHeight = pixelSnappedLogicalHeight() - (intrinsicPaddingBefore() + intrinsicPaddingAfter());
         int styleLogicalHeight = valueForLength(style()->logicalHeight(), 0);
         // In strict mode, box-sizing: content-box do the right thing and actually add in the border and padding.
         // Call computedCSSPadding* directly to avoid including implicitPadding.
         if (!document().inQuirksMode() && style()->boxSizing() != BORDER_BOX)
             styleLogicalHeight += (computedCSSPaddingBefore() + computedCSSPaddingAfter()).floor() + borderBefore() + borderAfter();
         return max(styleLogicalHeight, adjustedLogicalHeight);
     }


     void setCellLogicalWidth(int constrainedLogicalWidth, SubtreeLayoutScope&);

     virtual int borderLeft() const override;
     virtual int borderRight() const override;
     virtual int borderTop() const override;
     virtual int borderBottom() const override;
     virtual int borderStart() const override;
     virtual int borderEnd() const override;
     virtual int borderBefore() const override;
     virtual int borderAfter() const override;

     void collectBorderValues(RenderTable::CollapsedBorderValues&) const;
     static void sortBorderValues(RenderTable::CollapsedBorderValues&);

     virtual void layout() override;

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

     void paintCollapsedBorders(PaintInfo&, const LayoutPoint&);
     void paintBackgroundsBehindCell(PaintInfo&, const LayoutPoint&, RenderObject* backgroundObject);

     LayoutUnit cellBaselinePosition() const;
     bool isBaselineAligned() const
     {
         EVerticalAlign va = style()->verticalAlign();
         return va == BASELINE || va == TEXT_BOTTOM || va == TEXT_TOP || va == SUPER || va == SUB || va == LENGTH;
     }

     void computeIntrinsicPadding(int rowHeight, SubtreeLayoutScope&);
     void clearIntrinsicPadding() { setIntrinsicPadding(0, 0); }

     int intrinsicPaddingBefore() const { return m_intrinsicPaddingBefore; }
     int intrinsicPaddingAfter() const { return m_intrinsicPaddingAfter; }

     virtual LayoutUnit paddingTop() const override;
     virtual LayoutUnit paddingBottom() const override;
     virtual LayoutUnit paddingLeft() const override;
     virtual LayoutUnit paddingRight() const override;

     // FIXME: For now we just assume the cell has the same block flow direction as the table. It's likely we'll
     // create an extra anonymous RenderBlock to handle mixing directionality anyway, in which case we can lock
     // the block flow directionality of the cells to the table's directionality.
     virtual LayoutUnit paddingBefore() const override;
     virtual LayoutUnit paddingAfter() const override;

     void setOverrideLogicalContentHeightFromRowHeight(LayoutUnit);

     virtual void scrollbarsChanged(bool horizontalScrollbarChanged, bool verticalScrollbarChanged) override;

     bool cellWidthChanged() const { return m_cellWidthChanged; }
     void setCellWidthChanged(bool b = true) { m_cellWidthChanged = b; }

     static RenderTableCell* createAnonymous(Document*);
     static RenderTableCell* createAnonymousWithParentRenderer(const RenderObject*);
     virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const override
     {
         return createAnonymousWithParentRenderer(parent);
     }

     // This function is used to unify which table part's style we use for computing direction and
     // writing mode. Writing modes are not allowed on row group and row but direction is.
     // This means we can safely use the same style in all cases to simplify our code.
     // FIXME: Eventually this function should replaced by style() once we support direction
     // on all table parts and writing-mode on cells.
     const RenderStyle* styleForCellFlow() const
     {
         return row()->style();
     }

     const BorderValue& borderAdjoiningTableStart() const
     {
         ASSERT(isFirstOrLastCellInRow());
         if (section()->hasSameDirectionAs(table()))
             return style()->borderStart();

         return style()->borderEnd();
     }

     const BorderValue& borderAdjoiningTableEnd() const
     {
         ASSERT(isFirstOrLastCellInRow());
         if (section()->hasSameDirectionAs(table()))
             return style()->borderEnd();

         return style()->borderStart();
     }

     const BorderValue& borderAdjoiningCellBefore(const RenderTableCell* cell)
     {
         ASSERT_UNUSED(cell, table()->cellAfter(cell) == this);
         // FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
         return style()->borderStart();
     }

     const BorderValue& borderAdjoiningCellAfter(const RenderTableCell* cell)
     {
         ASSERT_UNUSED(cell, table()->cellBefore(cell) == this);
         // FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
         return style()->borderEnd();
     }

 #if ENABLE(ASSERT)
     bool isFirstOrLastCellInRow() const
     {
         return !table()->cellAfter(this) || !table()->cellBefore(this);
     }
 #endif
 protected:
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
     virtual void computePreferredLogicalWidths() override;

     virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentCompositedLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const override;

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

     virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectTableCell || RenderBlockFlow::isOfType(type); }

     virtual void willBeRemovedFromTree() override;

     virtual void updateLogicalWidth() override;

     virtual void paintBoxDecorationBackground(PaintInfo&, const LayoutPoint&) override;
     virtual void paintMask(PaintInfo&, const LayoutPoint&) override;

     virtual bool boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance, InlineFlowBox*) const override;

     virtual LayoutSize offsetFromContainer(const RenderObject*, const LayoutPoint&, bool* offsetDependsOnPoint = 0) const override;
     virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const override;
     virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const override;

     int borderHalfLeft(bool outer) const;
     int borderHalfRight(bool outer) const;
     int borderHalfTop(bool outer) const;
     int borderHalfBottom(bool outer) const;

     int borderHalfStart(bool outer) const;
     int borderHalfEnd(bool outer) const;
     int borderHalfBefore(bool outer) const;
     int borderHalfAfter(bool outer) const;

     void setIntrinsicPaddingBefore(int p) { m_intrinsicPaddingBefore = p; }
     void setIntrinsicPaddingAfter(int p) { m_intrinsicPaddingAfter = p; }
     void setIntrinsicPadding(int before, int after) { setIntrinsicPaddingBefore(before); setIntrinsicPaddingAfter(after); }

     bool hasStartBorderAdjoiningTable() const;
     bool hasEndBorderAdjoiningTable() const;

     CollapsedBorderValue collapsedStartBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
     CollapsedBorderValue collapsedEndBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
     CollapsedBorderValue collapsedBeforeBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
     CollapsedBorderValue collapsedAfterBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;

     CollapsedBorderValue cachedCollapsedLeftBorder(const RenderStyle*) const;
     CollapsedBorderValue cachedCollapsedRightBorder(const RenderStyle*) const;
     CollapsedBorderValue cachedCollapsedTopBorder(const RenderStyle*) const;
     CollapsedBorderValue cachedCollapsedBottomBorder(const RenderStyle*) const;

     CollapsedBorderValue computeCollapsedStartBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
     CollapsedBorderValue computeCollapsedEndBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
     CollapsedBorderValue computeCollapsedBeforeBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
     CollapsedBorderValue computeCollapsedAfterBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;

     Length logicalWidthFromColumns(RenderTableCol* firstColForThisCell, Length widthFromStyle) const;

     void updateColAndRowSpanFlags();

     unsigned parseRowSpanFromDOM() const;
     unsigned parseColSpanFromDOM() const;

     void nextSibling() const WTF_DELETED_FUNCTION;
     void previousSibling() const WTF_DELETED_FUNCTION;

     // Note MSVC will only pack members if they have identical types, hence we use unsigned instead of bool here.
     unsigned m_column : 29;
     unsigned m_cellWidthChanged : 1;
     unsigned m_hasColSpan: 1;
     unsigned m_hasRowSpan: 1;
     int m_intrinsicPaddingBefore;
     int m_intrinsicPaddingAfter;
 };

 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableCell, isTableCell());

 inline RenderTableCell* RenderTableCell::previousCell() const
 {
     return toRenderTableCell(RenderObject::previousSibling());
 }

 inline RenderTableCell* RenderTableCell::nextCell() const
 {
     return toRenderTableCell(RenderObject::nextSibling());
 }

 inline RenderTableCell* RenderTableRow::firstCell() const
 {
     ASSERT(children() == virtualChildren());
     return toRenderTableCell(children()->firstChild());
 }

 inline RenderTableCell* RenderTableRow::lastCell() const
 {
     ASSERT(children() == virtualChildren());
     return toRenderTableCell(children()->lastChild());
 }

 } // namespace blink

 #endif // RenderTableCell_h
	/*
	* 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, 2007, 2009, 2013 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.
	*/

	#ifndef RenderTableCell_h
	#define RenderTableCell_h

	#include "core/rendering/RenderBlockFlow.h"
	#include "core/rendering/RenderTableRow.h"
	#include "core/rendering/RenderTableSection.h"
	#include "platform/LengthFunctions.h"

	namespace blink {

	static const unsigned unsetColumnIndex = 0x1FFFFFFF;
	static const unsigned maxColumnIndex = 0x1FFFFFFE; // 536,870,910

	enum IncludeBorderColorOrNot { DoNotIncludeBorderColor, IncludeBorderColor };

	class SubtreeLayoutScope;

	class RenderTableCell final : public RenderBlockFlow {
	public:
	explicit RenderTableCell(Element*);

	unsigned colSpan() const
	{
	if (!m_hasColSpan)
	return 1;
	return parseColSpanFromDOM();
	}
	unsigned rowSpan() const
	{
	if (!m_hasRowSpan)
	return 1;
	return parseRowSpanFromDOM();
	}

	// Called from HTMLTableCellElement.
	void colSpanOrRowSpanChanged();

	void setCol(unsigned column)
	{
	if (UNLIKELY(column > maxColumnIndex))
	CRASH();

	m_column = column;
	}

	unsigned col() const
	{
	ASSERT(m_column != unsetColumnIndex);
	return m_column;
	}

	RenderTableRow* row() const { return toRenderTableRow(parent()); }
	RenderTableSection* section() const { return toRenderTableSection(parent()->parent()); }
	RenderTable* table() const { return toRenderTable(parent()->parent()->parent()); }

	RenderTableCell* previousCell() const;
	RenderTableCell* nextCell() const;

	unsigned rowIndex() const
	{
	// This function shouldn't be called on a detached cell.
	ASSERT(row());
	return row()->rowIndex();
	}

	Length styleOrColLogicalWidth() const
	{
	Length styleWidth = style()->logicalWidth();
	if (!styleWidth.isAuto())
	return styleWidth;
	if (RenderTableCol* firstColumn = table()->colElement(col()))
	return logicalWidthFromColumns(firstColumn, styleWidth);
	return styleWidth;
	}

	int logicalHeightForRowSizing() const
	{
	// FIXME: This function does too much work, and is very hot during table layout!
	int adjustedLogicalHeight = pixelSnappedLogicalHeight() - (intrinsicPaddingBefore() + intrinsicPaddingAfter());
	int styleLogicalHeight = valueForLength(style()->logicalHeight(), 0);
	// In strict mode, box-sizing: content-box do the right thing and actually add in the border and padding.
	// Call computedCSSPadding* directly to avoid including implicitPadding.
	if (!document().inQuirksMode() && style()->boxSizing() != BORDER_BOX)
	styleLogicalHeight += (computedCSSPaddingBefore() + computedCSSPaddingAfter()).floor() + borderBefore() + borderAfter();
	return max(styleLogicalHeight, adjustedLogicalHeight);
	}


	void setCellLogicalWidth(int constrainedLogicalWidth, SubtreeLayoutScope&);

	virtual int borderLeft() const override;
	virtual int borderRight() const override;
	virtual int borderTop() const override;
	virtual int borderBottom() const override;
	virtual int borderStart() const override;
	virtual int borderEnd() const override;
	virtual int borderBefore() const override;
	virtual int borderAfter() const override;

	void collectBorderValues(RenderTable::CollapsedBorderValues&) const;
	static void sortBorderValues(RenderTable::CollapsedBorderValues&);

	virtual void layout() override;

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

	void paintCollapsedBorders(PaintInfo&, const LayoutPoint&);
	void paintBackgroundsBehindCell(PaintInfo&, const LayoutPoint&, RenderObject* backgroundObject);

	LayoutUnit cellBaselinePosition() const;
	bool isBaselineAligned() const
	{
	EVerticalAlign va = style()->verticalAlign();
	return va == BASELINE \|\| va == TEXT_BOTTOM \|\| va == TEXT_TOP \|\| va == SUPER \|\| va == SUB \|\| va == LENGTH;
	}

	void computeIntrinsicPadding(int rowHeight, SubtreeLayoutScope&);
	void clearIntrinsicPadding() { setIntrinsicPadding(0, 0); }

	int intrinsicPaddingBefore() const { return m_intrinsicPaddingBefore; }
	int intrinsicPaddingAfter() const { return m_intrinsicPaddingAfter; }

	virtual LayoutUnit paddingTop() const override;
	virtual LayoutUnit paddingBottom() const override;
	virtual LayoutUnit paddingLeft() const override;
	virtual LayoutUnit paddingRight() const override;

	// FIXME: For now we just assume the cell has the same block flow direction as the table. It's likely we'll
	// create an extra anonymous RenderBlock to handle mixing directionality anyway, in which case we can lock
	// the block flow directionality of the cells to the table's directionality.
	virtual LayoutUnit paddingBefore() const override;
	virtual LayoutUnit paddingAfter() const override;

	void setOverrideLogicalContentHeightFromRowHeight(LayoutUnit);

	virtual void scrollbarsChanged(bool horizontalScrollbarChanged, bool verticalScrollbarChanged) override;

	bool cellWidthChanged() const { return m_cellWidthChanged; }
	void setCellWidthChanged(bool b = true) { m_cellWidthChanged = b; }

	static RenderTableCell* createAnonymous(Document*);
	static RenderTableCell* createAnonymousWithParentRenderer(const RenderObject*);
	virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const override
	{
	return createAnonymousWithParentRenderer(parent);
	}

	// This function is used to unify which table part's style we use for computing direction and
	// writing mode. Writing modes are not allowed on row group and row but direction is.
	// This means we can safely use the same style in all cases to simplify our code.
	// FIXME: Eventually this function should replaced by style() once we support direction
	// on all table parts and writing-mode on cells.
	const RenderStyle* styleForCellFlow() const
	{
	return row()->style();
	}

	const BorderValue& borderAdjoiningTableStart() const
	{
	ASSERT(isFirstOrLastCellInRow());
	if (section()->hasSameDirectionAs(table()))
	return style()->borderStart();

	return style()->borderEnd();
	}

	const BorderValue& borderAdjoiningTableEnd() const
	{
	ASSERT(isFirstOrLastCellInRow());
	if (section()->hasSameDirectionAs(table()))
	return style()->borderEnd();

	return style()->borderStart();
	}

	const BorderValue& borderAdjoiningCellBefore(const RenderTableCell* cell)
	{
	ASSERT_UNUSED(cell, table()->cellAfter(cell) == this);
	// FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
	return style()->borderStart();
	}

	const BorderValue& borderAdjoiningCellAfter(const RenderTableCell* cell)
	{
	ASSERT_UNUSED(cell, table()->cellBefore(cell) == this);
	// FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
	return style()->borderEnd();
	}

	#if ENABLE(ASSERT)
	bool isFirstOrLastCellInRow() const
	{
	return !table()->cellAfter(this) \|\| !table()->cellBefore(this);
	}
	#endif
	protected:
	virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
	virtual void computePreferredLogicalWidths() override;

	virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentCompositedLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const override;

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

	virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectTableCell \|\| RenderBlockFlow::isOfType(type); }

	virtual void willBeRemovedFromTree() override;

	virtual void updateLogicalWidth() override;

	virtual void paintBoxDecorationBackground(PaintInfo&, const LayoutPoint&) override;
	virtual void paintMask(PaintInfo&, const LayoutPoint&) override;

	virtual bool boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance, InlineFlowBox*) const override;

	virtual LayoutSize offsetFromContainer(const RenderObject, const LayoutPoint&, bool offsetDependsOnPoint = 0) const override;
	virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const override;
	virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const override;

	int borderHalfLeft(bool outer) const;
	int borderHalfRight(bool outer) const;
	int borderHalfTop(bool outer) const;
	int borderHalfBottom(bool outer) const;

	int borderHalfStart(bool outer) const;
	int borderHalfEnd(bool outer) const;
	int borderHalfBefore(bool outer) const;
	int borderHalfAfter(bool outer) const;

	void setIntrinsicPaddingBefore(int p) { m_intrinsicPaddingBefore = p; }
	void setIntrinsicPaddingAfter(int p) { m_intrinsicPaddingAfter = p; }
	void setIntrinsicPadding(int before, int after) { setIntrinsicPaddingBefore(before); setIntrinsicPaddingAfter(after); }

	bool hasStartBorderAdjoiningTable() const;
	bool hasEndBorderAdjoiningTable() const;

	CollapsedBorderValue collapsedStartBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
	CollapsedBorderValue collapsedEndBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
	CollapsedBorderValue collapsedBeforeBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
	CollapsedBorderValue collapsedAfterBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;

	CollapsedBorderValue cachedCollapsedLeftBorder(const RenderStyle*) const;
	CollapsedBorderValue cachedCollapsedRightBorder(const RenderStyle*) const;
	CollapsedBorderValue cachedCollapsedTopBorder(const RenderStyle*) const;
	CollapsedBorderValue cachedCollapsedBottomBorder(const RenderStyle*) const;

	CollapsedBorderValue computeCollapsedStartBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
	CollapsedBorderValue computeCollapsedEndBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
	CollapsedBorderValue computeCollapsedBeforeBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;
	CollapsedBorderValue computeCollapsedAfterBorder(IncludeBorderColorOrNot = IncludeBorderColor) const;

	Length logicalWidthFromColumns(RenderTableCol* firstColForThisCell, Length widthFromStyle) const;

	void updateColAndRowSpanFlags();

	unsigned parseRowSpanFromDOM() const;
	unsigned parseColSpanFromDOM() const;

	void nextSibling() const WTF_DELETED_FUNCTION;
	void previousSibling() const WTF_DELETED_FUNCTION;

	// Note MSVC will only pack members if they have identical types, hence we use unsigned instead of bool here.
	unsigned m_column : 29;
	unsigned m_cellWidthChanged : 1;
	unsigned m_hasColSpan: 1;
	unsigned m_hasRowSpan: 1;
	int m_intrinsicPaddingBefore;
	int m_intrinsicPaddingAfter;
	};

	DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableCell, isTableCell());

	inline RenderTableCell* RenderTableCell::previousCell() const
	{
	return toRenderTableCell(RenderObject::previousSibling());
	}

	inline RenderTableCell* RenderTableCell::nextCell() const
	{
	return toRenderTableCell(RenderObject::nextSibling());
	}

	inline RenderTableCell* RenderTableRow::firstCell() const
	{
	ASSERT(children() == virtualChildren());
	return toRenderTableCell(children()->firstChild());
	}

	inline RenderTableCell* RenderTableRow::lastCell() const
	{
	ASSERT(children() == virtualChildren());
	return toRenderTableCell(children()->lastChild());
	}

	} // namespace blink

	#endif // RenderTableCell_h