FCL/sf/mw/qtwebkit: comparison WebCore/rendering/RenderTableCell.cpp

equal deleted inserted replaced

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+:4f2f89ce4247
+/*
+* 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, 2008, 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.
+*/
+#include "config.h"
+#include "RenderTableCell.h"
+#include "FloatQuad.h"
+#include "GraphicsContext.h"
+#include "HTMLNames.h"
+#include "HTMLTableCellElement.h"
+#include "RenderTableCol.h"
+#include "RenderView.h"
+#include "TransformState.h"
+using namespace std;
+namespace WebCore {
+using namespace HTMLNames;
+RenderTableCell::RenderTableCell(Node* node)
+: RenderBlock(node)
+, m_row(-1)
+, m_column(-1)
+, m_rowSpan(1)
+, m_columnSpan(1)
+, m_intrinsicPaddingTop(0)
+, m_intrinsicPaddingBottom(0)
+, m_percentageHeight(0)
+{
+updateFromElement();
+}
+void RenderTableCell::destroy()
+{
+RenderTableSection* recalcSection = parent() ? section() : 0;
+RenderBlock::destroy();
+if (recalcSection)
+recalcSection->setNeedsCellRecalc();
+}
+void RenderTableCell::updateFromElement()
+{
+Node* n = node();
+if (n && (n->hasTagName(tdTag) || n->hasTagName(thTag))) {
+HTMLTableCellElement* tc = static_cast<HTMLTableCellElement*>(n);
+int oldRSpan = m_rowSpan;
+int oldCSpan = m_columnSpan;
+m_columnSpan = tc->colSpan();
+m_rowSpan = tc->rowSpan();
+if ((oldRSpan != m_rowSpan || oldCSpan != m_columnSpan) && style() && parent()) {
+setNeedsLayoutAndPrefWidthsRecalc();
+if (section())
+section()->setNeedsCellRecalc();
+}
+}
+}
+Length RenderTableCell::styleOrColWidth() const
+{
+Length w = style()->width();
+if (!w.isAuto())
+return w;
+RenderTableCol* tableCol = table()->colElement(col());
+if (tableCol) {
+int colSpanCount = colSpan();
+Length colWidthSum = Length(0, Fixed);
+for (int i = 1; i <= colSpanCount; i++) {
+Length colWidth = tableCol->style()->width();
+// Percentage value should be returned only for colSpan == 1.
+// Otherwise we return original width for the cell.
+if (!colWidth.isFixed()) {
+if (colSpanCount > 1)
+return w;
+return colWidth;
+}
+colWidthSum = Length(colWidthSum.value() + colWidth.value(), Fixed);
+tableCol = table()->nextColElement(tableCol);
+// If no next <col> tag found for the span we just return what we have for now.
+if (!tableCol)
+break;
+}
+// Column widths specified on <col> apply to the border box of the cell.
+// Percentages don't need to be handled since they're always treated this way (even when specified on the cells).
+// See Bugzilla bug 8126 for details.
+if (colWidthSum.isFixed() && colWidthSum.value() > 0)
+colWidthSum = Length(max(0, colWidthSum.value() - borderAndPaddingWidth()), Fixed);
+return colWidthSum;
+}
+return w;
+}
+void RenderTableCell::calcPrefWidths()
+{
+// The child cells rely on the grids up in the sections to do their calcPrefWidths work.  Normally the sections are set up early, as table
+// cells are added, but relayout can cause the cells to be freed, leaving stale pointers in the sections'
+// grids.  We must refresh those grids before the child cells try to use them.
+table()->recalcSectionsIfNeeded();
+RenderBlock::calcPrefWidths();
+if (node() && style()->autoWrap()) {
+// See if nowrap was set.
+Length w = styleOrColWidth();
+String nowrap = static_cast<Element*>(node())->getAttribute(nowrapAttr);
+if (!nowrap.isNull() && w.isFixed())
+// Nowrap is set, but we didn't actually use it because of the
+// fixed width set on the cell.  Even so, it is a WinIE/Moz trait
+// to make the minwidth of the cell into the fixed width.  They do this
+// even in strict mode, so do not make this a quirk.  Affected the top
+// of hiptop.com.
+m_minPrefWidth = max(w.value(), m_minPrefWidth);
+}
+}
+void RenderTableCell::calcWidth()
+{
+}
+void RenderTableCell::updateWidth(int w)
+{
+if (w != width()) {
+setWidth(w);
+setCellWidthChanged(true);
+}
+}
+void RenderTableCell::layout()
+{
+layoutBlock(cellWidthChanged());
+setCellWidthChanged(false);
+}
+int RenderTableCell::paddingTop(bool includeIntrinsicPadding) const
+{
+return RenderBlock::paddingTop() + (includeIntrinsicPadding ? intrinsicPaddingTop() : 0);
+}
+int RenderTableCell::paddingBottom(bool includeIntrinsicPadding) const
+{
+return RenderBlock::paddingBottom() + (includeIntrinsicPadding ? intrinsicPaddingBottom() : 0);
+}
+void RenderTableCell::setOverrideSize(int size)
+{
+clearIntrinsicPadding();
+RenderBlock::setOverrideSize(size);
+}
+IntSize RenderTableCell::offsetFromContainer(RenderObject* o, const IntPoint& point) const
+{
+ASSERT(o == container());
+IntSize offset = RenderBlock::offsetFromContainer(o, point);
+if (parent())
+offset.expand(-parentBox()->x(), -parentBox()->y());
+return offset;
+}
+IntRect RenderTableCell::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)
+{
+// If the table grid is dirty, we cannot get reliable information about adjoining cells,
+// so we ignore outside borders. This should not be a problem because it means that
+// the table is going to recalculate the grid, relayout and repaint its current rect, which
+// includes any outside borders of this cell.
+if (!table()->collapseBorders() || table()->needsSectionRecalc())
+return RenderBlock::clippedOverflowRectForRepaint(repaintContainer);
+bool rtl = table()->style()->direction() == RTL;
+int outlineSize = style()->outlineSize();
+int left = max(borderHalfLeft(true), outlineSize);
+int right = max(borderHalfRight(true), outlineSize);
+int top = max(borderHalfTop(true), outlineSize);
+int bottom = max(borderHalfBottom(true), outlineSize);
+if ((left && !rtl) || (right && rtl)) {
+if (RenderTableCell* before = table()->cellBefore(this)) {
+top = max(top, before->borderHalfTop(true));
+bottom = max(bottom, before->borderHalfBottom(true));
+}
+}
+if ((left && rtl) || (right && !rtl)) {
+if (RenderTableCell* after = table()->cellAfter(this)) {
+top = max(top, after->borderHalfTop(true));
+bottom = max(bottom, after->borderHalfBottom(true));
+}
+}
+if (top) {
+if (RenderTableCell* above = table()->cellAbove(this)) {
+left = max(left, above->borderHalfLeft(true));
+right = max(right, above->borderHalfRight(true));
+}
+}
+if (bottom) {
+if (RenderTableCell* below = table()->cellBelow(this)) {
+left = max(left, below->borderHalfLeft(true));
+right = max(right, below->borderHalfRight(true));
+}
+}
+left = max(left, -leftVisibleOverflow());
+top = max(top, -topVisibleOverflow());
+IntRect r(-left, - top, left + max(width() + right, rightVisibleOverflow()), top + max(height() + bottom, bottomVisibleOverflow()));
+if (RenderView* v = view()) {
+// FIXME: layoutDelta needs to be applied in parts before/after transforms and
+// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
+r.move(v->layoutDelta());
+}
+computeRectForRepaint(repaintContainer, r);
+return r;
+}
+void RenderTableCell::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& r, bool fixed)
+{
+if (repaintContainer == this)
+return;
+r.setY(r.y());
+RenderView* v = view();
+if ((!v || !v->layoutStateEnabled() || repaintContainer) && parent())
+r.move(-parentBox()->x(), -parentBox()->y()); // Rows are in the same coordinate space, so don't add their offset in.
+RenderBlock::computeRectForRepaint(repaintContainer, r, fixed);
+}
+int RenderTableCell::baselinePosition(bool firstLine, bool isRootLineBox) const
+{
+if (isRootLineBox)
+return RenderBox::baselinePosition(firstLine, isRootLineBox);
+// <http://www.w3.org/TR/2007/CR-CSS21-20070719/tables.html#height-layout>: The baseline of a cell is the baseline of
+// the first in-flow line box in the cell, or the first in-flow table-row in the cell, whichever comes first. If there
+// is no such line box or table-row, the baseline is the bottom of content edge of the cell box.
+int firstLineBaseline = firstLineBoxBaseline();
+if (firstLineBaseline != -1)
+return firstLineBaseline;
+return paddingTop() + borderTop() + contentHeight();
+}
+void RenderTableCell::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+{
+if (parent() && section() && style() && style()->height() != newStyle->height())
+section()->setNeedsCellRecalc();
+ASSERT(newStyle->display() == TABLE_CELL);
+RenderBlock::styleWillChange(diff, newStyle);
+}
+void RenderTableCell::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
+{
+RenderBlock::styleDidChange(diff, oldStyle);
+setHasBoxDecorations(true);
+}
+// The following rules apply for resolving conflicts and figuring out which border
+// to use.
+// (1) Borders with the 'border-style' of 'hidden' take precedence over all other conflicting
+// borders. Any border with this value suppresses all borders at this location.
+// (2) Borders with a style of 'none' have the lowest priority. Only if the border properties of all
+// the elements meeting at this edge are 'none' will the border be omitted (but note that 'none' is
+// the default value for the border style.)
+// (3) If none of the styles are 'hidden' and at least one of them is not 'none', then narrow borders
+// are discarded in favor of wider ones. If several have the same 'border-width' then styles are preferred
+// in this order: 'double', 'solid', 'dashed', 'dotted', 'ridge', 'outset', 'groove', and the lowest: 'inset'.
+// (4) If border styles differ only in color, then a style set on a cell wins over one on a row,
+// which wins over a row group, column, column group and, lastly, table. It is undefined which color
+// is used when two elements of the same type disagree.
+static CollapsedBorderValue compareBorders(const CollapsedBorderValue& border1, const CollapsedBorderValue& border2)
+{
+// Sanity check the values passed in.  If either is null, return the other.
+if (!border2.exists())
+return border1;
+if (!border1.exists())
+return border2;
+// Rule #1 above.
+if (border1.style() == BHIDDEN || border2.style() == BHIDDEN)
+return CollapsedBorderValue(); // No border should exist at this location.
+// Rule #2 above.  A style of 'none' has lowest priority and always loses to any other border.
+if (border2.style() == BNONE)
+return border1;
+if (border1.style() == BNONE)
+return border2;
+// The first part of rule #3 above. Wider borders win.
+if (border1.width() != border2.width())
+return border1.width() > border2.width() ? border1 : border2;
+// The borders have equal width.  Sort by border style.
+if (border1.style() != border2.style())
+return border1.style() > border2.style() ? border1 : border2;
+// The border have the same width and style.  Rely on precedence (cell over row over row group, etc.)
+return border1.precedence() >= border2.precedence() ? border1 : border2;
+}
+CollapsedBorderValue RenderTableCell::collapsedLeftBorder(bool rtl) const
+{
+RenderTable* tableElt = table();
+bool leftmostColumn;
+if (!rtl)
+leftmostColumn = col() == 0;
+else {
+int effCol = tableElt->colToEffCol(col() + colSpan() - 1);
+leftmostColumn = effCol == tableElt->numEffCols() - 1;
+}
+// For border left, we need to check, in order of precedence:
+// (1) Our left border.
+int left = CSSPropertyBorderLeftColor;
+int right = CSSPropertyBorderRightColor;
+CollapsedBorderValue result(&style()->borderLeft(), style()->visitedDependentColor(left), BCELL);
+// (2) The right border of the cell to the left.
+RenderTableCell* prevCell = rtl ? tableElt->cellAfter(this) : tableElt->cellBefore(this);
+if (prevCell) {
+CollapsedBorderValue prevCellBorder = CollapsedBorderValue(&prevCell->style()->borderRight(), prevCell->style()->visitedDependentColor(right), BCELL);
+result = rtl ? compareBorders(result, prevCellBorder) : compareBorders(prevCellBorder, result);
+if (!result.exists())
+return result;
+} else if (leftmostColumn) {
+// (3) Our row's left border.
+result = compareBorders(result, CollapsedBorderValue(&parent()->style()->borderLeft(), parent()->style()->visitedDependentColor(left), BROW));
+if (!result.exists())
+return result;
+// (4) Our row group's left border.
+result = compareBorders(result, CollapsedBorderValue(&section()->style()->borderLeft(), section()->style()->visitedDependentColor(left), BROWGROUP));
+if (!result.exists())
+return result;
+}
+// (5) Our column and column group's left borders.
+bool startColEdge;
+bool endColEdge;
+RenderTableCol* colElt = tableElt->colElement(col() + (rtl ? colSpan() - 1 : 0), &startColEdge, &endColEdge);
+if (colElt && (!rtl ? startColEdge : endColEdge)) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->style()->borderLeft(), colElt->style()->visitedDependentColor(left), BCOL));
+if (!result.exists())
+return result;
+if (colElt->parent()->isTableCol() && (!rtl ? !colElt->previousSibling() : !colElt->nextSibling())) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->parent()->style()->borderLeft(), colElt->parent()->style()->visitedDependentColor(left), BCOLGROUP));
+if (!result.exists())
+return result;
+}
+}
+// (6) The right border of the column to the left.
+if (!leftmostColumn) {
+colElt = tableElt->colElement(col() + (rtl ? colSpan() : -1), &startColEdge, &endColEdge);
+if (colElt && (!rtl ? endColEdge : startColEdge)) {
+CollapsedBorderValue rightBorder = CollapsedBorderValue(&colElt->style()->borderRight(), colElt->style()->visitedDependentColor(right), BCOL);
+result = rtl ? compareBorders(result, rightBorder) : compareBorders(rightBorder, result);
+if (!result.exists())
+return result;
+}
+} else {
+// (7) The table's left border.
+result = compareBorders(result, CollapsedBorderValue(&tableElt->style()->borderLeft(), tableElt->style()->visitedDependentColor(left), BTABLE));
+if (!result.exists())
+return result;
+}
+return result;
+}
+CollapsedBorderValue RenderTableCell::collapsedRightBorder(bool rtl) const
+{
+RenderTable* tableElt = table();
+bool rightmostColumn;
+if (rtl)
+rightmostColumn = col() == 0;
+else {
+int effCol = tableElt->colToEffCol(col() + colSpan() - 1);
+rightmostColumn = effCol == tableElt->numEffCols() - 1;
+}
+// For border right, we need to check, in order of precedence:
+// (1) Our right border.
+int left = CSSPropertyBorderLeftColor;
+int right = CSSPropertyBorderRightColor;
+CollapsedBorderValue result = CollapsedBorderValue(&style()->borderRight(), style()->visitedDependentColor(right), BCELL);
+// (2) The left border of the cell to the right.
+if (!rightmostColumn) {
+RenderTableCell* nextCell = rtl ? tableElt->cellBefore(this) : tableElt->cellAfter(this);
+if (nextCell && nextCell->style()) {
+CollapsedBorderValue leftBorder = CollapsedBorderValue(&nextCell->style()->borderLeft(), nextCell->style()->visitedDependentColor(left), BCELL);
+result = rtl ? compareBorders(leftBorder, result) : compareBorders(result, leftBorder);
+if (!result.exists())
+return result;
+}
+} else {
+// (3) Our row's right border.
+result = compareBorders(result, CollapsedBorderValue(&parent()->style()->borderRight(), parent()->style()->visitedDependentColor(right), BROW));
+if (!result.exists())
+return result;
+// (4) Our row group's right border.
+result = compareBorders(result, CollapsedBorderValue(&section()->style()->borderRight(), section()->style()->visitedDependentColor(right), BROWGROUP));
+if (!result.exists())
+return result;
+}
+// (5) Our column and column group's right borders.
+bool startColEdge;
+bool endColEdge;
+RenderTableCol* colElt = tableElt->colElement(col() + (rtl ? 0 : colSpan() - 1), &startColEdge, &endColEdge);
+if (colElt && (!rtl ? endColEdge : startColEdge)) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->style()->borderRight(), colElt->style()->visitedDependentColor(right), BCOL));
+if (!result.exists())
+return result;
+if (colElt->parent()->isTableCol() && (!rtl ? !colElt->nextSibling() : !colElt->previousSibling())) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->parent()->style()->borderRight(), colElt->parent()->style()->visitedDependentColor(right), BCOLGROUP));
+if (!result.exists())
+return result;
+}
+}
+// (6) The left border of the column to the right.
+if (!rightmostColumn) {
+colElt = tableElt->colElement(col() + (rtl ? -1 : colSpan()), &startColEdge, &endColEdge);
+if (colElt && (!rtl ? startColEdge : endColEdge)) {
+CollapsedBorderValue leftBorder = CollapsedBorderValue(&colElt->style()->borderLeft(), colElt->style()->visitedDependentColor(left), BCOL);
+result = rtl ? compareBorders(leftBorder, result) : compareBorders(result, leftBorder);
+if (!result.exists())
+return result;
+}
+} else {
+// (7) The table's right border.
+result = compareBorders(result, CollapsedBorderValue(&tableElt->style()->borderRight(), tableElt->style()->visitedDependentColor(right), BTABLE));
+if (!result.exists())
+return result;
+}
+return result;
+}
+CollapsedBorderValue RenderTableCell::collapsedTopBorder() const
+{
+// For border top, we need to check, in order of precedence:
+// (1) Our top border.
+int top = CSSPropertyBorderTopColor;
+int bottom = CSSPropertyBorderBottomColor;
+CollapsedBorderValue result = CollapsedBorderValue(&style()->borderTop(), style()->visitedDependentColor(top), BCELL);
+RenderTableCell* prevCell = table()->cellAbove(this);
+if (prevCell) {
+// (2) A previous cell's bottom border.
+result = compareBorders(CollapsedBorderValue(&prevCell->style()->borderBottom(), prevCell->style()->visitedDependentColor(bottom), BCELL), result);
+if (!result.exists())
+return result;
+}
+// (3) Our row's top border.
+result = compareBorders(result, CollapsedBorderValue(&parent()->style()->borderTop(), parent()->style()->visitedDependentColor(top), BROW));
+if (!result.exists())
+return result;
+// (4) The previous row's bottom border.
+if (prevCell) {
+RenderObject* prevRow = 0;
+if (prevCell->section() == section())
+prevRow = parent()->previousSibling();
+else
+prevRow = prevCell->section()->lastChild();
+if (prevRow) {
+result = compareBorders(CollapsedBorderValue(&prevRow->style()->borderBottom(), prevRow->style()->visitedDependentColor(bottom), BROW), result);
+if (!result.exists())
+return result;
+}
+}
+// Now check row groups.
+RenderTableSection* currSection = section();
+if (!row()) {
+// (5) Our row group's top border.
+result = compareBorders(result, CollapsedBorderValue(&currSection->style()->borderTop(), currSection->style()->visitedDependentColor(top), BROWGROUP));
+if (!result.exists())
+return result;
+// (6) Previous row group's bottom border.
+currSection = table()->sectionAbove(currSection);
+if (currSection) {
+result = compareBorders(CollapsedBorderValue(&currSection->style()->borderBottom(), currSection->style()->visitedDependentColor(bottom), BROWGROUP), result);
+if (!result.exists())
+return result;
+}
+}
+if (!currSection) {
+// (8) Our column and column group's top borders.
+RenderTableCol* colElt = table()->colElement(col());
+if (colElt) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->style()->borderTop(), colElt->style()->visitedDependentColor(top), BCOL));
+if (!result.exists())
+return result;
+if (colElt->parent()->isTableCol()) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->parent()->style()->borderTop(), colElt->parent()->style()->visitedDependentColor(top), BCOLGROUP));
+if (!result.exists())
+return result;
+}
+}
+// (9) The table's top border.
+RenderTable* enclosingTable = table();
+result = compareBorders(result, CollapsedBorderValue(&enclosingTable->style()->borderTop(), enclosingTable->style()->visitedDependentColor(top), BTABLE));
+if (!result.exists())
+return result;
+}
+return result;
+}
+CollapsedBorderValue RenderTableCell::collapsedBottomBorder() const
+{
+// For border top, we need to check, in order of precedence:
+// (1) Our bottom border.
+int top = CSSPropertyBorderTopColor;
+int bottom = CSSPropertyBorderBottomColor;
+CollapsedBorderValue result = CollapsedBorderValue(&style()->borderBottom(), style()->visitedDependentColor(bottom), BCELL);
+RenderTableCell* nextCell = table()->cellBelow(this);
+if (nextCell) {
+// (2) A following cell's top border.
+result = compareBorders(result, CollapsedBorderValue(&nextCell->style()->borderTop(), nextCell->style()->visitedDependentColor(top), BCELL));
+if (!result.exists())
+return result;
+}
+// (3) Our row's bottom border. (FIXME: Deal with rowspan!)
+result = compareBorders(result, CollapsedBorderValue(&parent()->style()->borderBottom(), parent()->style()->visitedDependentColor(bottom), BROW));
+if (!result.exists())
+return result;
+// (4) The next row's top border.
+if (nextCell) {
+result = compareBorders(result, CollapsedBorderValue(&nextCell->parent()->style()->borderTop(), nextCell->parent()->style()->visitedDependentColor(top), BROW));
+if (!result.exists())
+return result;
+}
+// Now check row groups.
+RenderTableSection* currSection = section();
+if (row() + rowSpan() >= currSection->numRows()) {
+// (5) Our row group's bottom border.
+result = compareBorders(result, CollapsedBorderValue(&currSection->style()->borderBottom(), currSection->style()->visitedDependentColor(bottom), BROWGROUP));
+if (!result.exists())
+return result;
+// (6) Following row group's top border.
+currSection = table()->sectionBelow(currSection);
+if (currSection) {
+result = compareBorders(result, CollapsedBorderValue(&currSection->style()->borderTop(), currSection->style()->visitedDependentColor(top), BROWGROUP));
+if (!result.exists())
+return result;
+}
+}
+if (!currSection) {
+// (8) Our column and column group's bottom borders.
+RenderTableCol* colElt = table()->colElement(col());
+if (colElt) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->style()->borderBottom(), colElt->style()->visitedDependentColor(bottom), BCOL));
+if (!result.exists()) return result;
+if (colElt->parent()->isTableCol()) {
+result = compareBorders(result, CollapsedBorderValue(&colElt->parent()->style()->borderBottom(), colElt->parent()->style()->visitedDependentColor(bottom), BCOLGROUP));
+if (!result.exists())
+return result;
+}
+}
+// (9) The table's bottom border.
+RenderTable* enclosingTable = table();
+result = compareBorders(result, CollapsedBorderValue(&enclosingTable->style()->borderBottom(), enclosingTable->style()->visitedDependentColor(bottom), BTABLE));
+if (!result.exists())
+return result;
+}
+return result;
+}
+int RenderTableCell::borderLeft() const
+{
+return table()->collapseBorders() ? borderHalfLeft(false) : RenderBlock::borderLeft();
+}
+int RenderTableCell::borderRight() const
+{
+return table()->collapseBorders() ? borderHalfRight(false) : RenderBlock::borderRight();
+}
+int RenderTableCell::borderTop() const
+{
+return table()->collapseBorders() ? borderHalfTop(false) : RenderBlock::borderTop();
+}
+int RenderTableCell::borderBottom() const
+{
+return table()->collapseBorders() ? borderHalfBottom(false) : RenderBlock::borderBottom();
+}
+int RenderTableCell::borderHalfLeft(bool outer) const
+{
+CollapsedBorderValue border = collapsedLeftBorder(table()->style()->direction() == RTL);
+if (border.exists())
+return (border.width() + (outer ? 0 : 1)) / 2; // Give the extra pixel to top and left.
+return 0;
+}
+int RenderTableCell::borderHalfRight(bool outer) const
+{
+CollapsedBorderValue border = collapsedRightBorder(table()->style()->direction() == RTL);
+if (border.exists())
+return (border.width() + (outer ? 1 : 0)) / 2;
+return 0;
+}
+int RenderTableCell::borderHalfTop(bool outer) const
+{
+CollapsedBorderValue border = collapsedTopBorder();
+if (border.exists())
+return (border.width() + (outer ? 0 : 1)) / 2; // Give the extra pixel to top and left.
+return 0;
+}
+int RenderTableCell::borderHalfBottom(bool outer) const
+{
+CollapsedBorderValue border = collapsedBottomBorder();
+if (border.exists())
+return (border.width() + (outer ? 1 : 0)) / 2;
+return 0;
+}
+void RenderTableCell::paint(PaintInfo& paintInfo, int tx, int ty)
+{
+if (paintInfo.phase == PaintPhaseCollapsedTableBorders && style()->visibility() == VISIBLE) {
+if (!paintInfo.shouldPaintWithinRoot(this))
+return;
+tx += x();
+ty += y();
+int os = 2 * maximalOutlineSize(paintInfo.phase);
+if (ty - table()->outerBorderTop() < paintInfo.rect.bottom() + os &&
+ty + height() + table()->outerBorderBottom() > paintInfo.rect.y() - os)
+paintCollapsedBorder(paintInfo.context, tx, ty, width(), height());
+return;
+}
+RenderBlock::paint(paintInfo, tx, ty);
+}
+static EBorderStyle collapsedBorderStyle(EBorderStyle style)
+{
+if (style == OUTSET)
+return GROOVE;
+if (style == INSET)
+return RIDGE;
+return style;
+}
+struct CollapsedBorder {
+CollapsedBorderValue borderValue;
+BoxSide side;
+bool shouldPaint;
+int x1;
+int y1;
+int x2;
+int y2;
+EBorderStyle style;
+};
+class CollapsedBorders {
+public:
+CollapsedBorders()
+: m_count(0)
+{
+}
+void addBorder(const CollapsedBorderValue& borderValue, BoxSide borderSide, bool shouldPaint,
+int x1, int y1, int x2, int y2, EBorderStyle borderStyle)
+{
+if (borderValue.exists() && shouldPaint) {
+m_borders[m_count].borderValue = borderValue;
+m_borders[m_count].side = borderSide;
+m_borders[m_count].shouldPaint = shouldPaint;
+m_borders[m_count].x1 = x1;
+m_borders[m_count].x2 = x2;
+m_borders[m_count].y1 = y1;
+m_borders[m_count].y2 = y2;
+m_borders[m_count].style = borderStyle;
+m_count++;
+}
+}
+CollapsedBorder* nextBorder()
+{
+for (int i = 0; i < m_count; i++) {
+if (m_borders[i].borderValue.exists() && m_borders[i].shouldPaint) {
+m_borders[i].shouldPaint = false;
+return &m_borders[i];
+}
+}
+return 0;
+}
+CollapsedBorder m_borders[4];
+int m_count;
+};
+static void addBorderStyle(RenderTableCell::CollapsedBorderStyles& borderStyles, CollapsedBorderValue borderValue)
+{
+if (!borderValue.exists())
+return;
+size_t count = borderStyles.size();
+for (size_t i = 0; i < count; ++i)
+if (borderStyles[i] == borderValue)
+return;
+borderStyles.append(borderValue);
+}
+void RenderTableCell::collectBorderStyles(CollapsedBorderStyles& borderStyles) const
+{
+bool rtl = table()->style()->direction() == RTL;
+addBorderStyle(borderStyles, collapsedLeftBorder(rtl));
+addBorderStyle(borderStyles, collapsedRightBorder(rtl));
+addBorderStyle(borderStyles, collapsedTopBorder());
+addBorderStyle(borderStyles, collapsedBottomBorder());
+}
+static int compareBorderStylesForQSort(const void* pa, const void* pb)
+{
+const CollapsedBorderValue* a = static_cast<const CollapsedBorderValue*>(pa);
+const CollapsedBorderValue* b = static_cast<const CollapsedBorderValue*>(pb);
+if (*a == *b)
+return 0;
+CollapsedBorderValue borderWithHigherPrecedence = compareBorders(*a, *b);
+if (*a == borderWithHigherPrecedence)
+return 1;
+return -1;
+}
+void RenderTableCell::sortBorderStyles(CollapsedBorderStyles& borderStyles)
+{
+qsort(borderStyles.data(), borderStyles.size(), sizeof(CollapsedBorderValue),
+compareBorderStylesForQSort);
+}
+void RenderTableCell::paintCollapsedBorder(GraphicsContext* graphicsContext, int tx, int ty, int w, int h)
+{
+if (!table()->currentBorderStyle())
+return;
+bool rtl = table()->style()->direction() == RTL;
+CollapsedBorderValue leftVal = collapsedLeftBorder(rtl);
+CollapsedBorderValue rightVal = collapsedRightBorder(rtl);
+CollapsedBorderValue topVal = collapsedTopBorder();
+CollapsedBorderValue bottomVal = collapsedBottomBorder();
+// Adjust our x/y/width/height so that we paint the collapsed borders at the correct location.
+int topWidth = topVal.width();
+int bottomWidth = bottomVal.width();
+int leftWidth = leftVal.width();
+int rightWidth = rightVal.width();
+tx -= leftWidth / 2;
+ty -= topWidth / 2;
+w += leftWidth / 2 + (rightWidth + 1) / 2;
+h += topWidth / 2 + (bottomWidth + 1) / 2;
+EBorderStyle topStyle = collapsedBorderStyle(topVal.style());
+EBorderStyle bottomStyle = collapsedBorderStyle(bottomVal.style());
+EBorderStyle leftStyle = collapsedBorderStyle(leftVal.style());
+EBorderStyle rightStyle = collapsedBorderStyle(rightVal.style());
+bool renderTop = topStyle > BHIDDEN && !topVal.isTransparent();
+bool renderBottom = bottomStyle > BHIDDEN && !bottomVal.isTransparent();
+bool renderLeft = leftStyle > BHIDDEN && !leftVal.isTransparent();
+bool renderRight = rightStyle > BHIDDEN && !rightVal.isTransparent();
+// We never paint diagonals at the joins.  We simply let the border with the highest
+// precedence paint on top of borders with lower precedence.
+CollapsedBorders borders;
+borders.addBorder(topVal, BSTop, renderTop, tx, ty, tx + w, ty + topWidth, topStyle);
+borders.addBorder(bottomVal, BSBottom, renderBottom, tx, ty + h - bottomWidth, tx + w, ty + h, bottomStyle);
+borders.addBorder(leftVal, BSLeft, renderLeft, tx, ty, tx + leftWidth, ty + h, leftStyle);
+borders.addBorder(rightVal, BSRight, renderRight, tx + w - rightWidth, ty, tx + w, ty + h, rightStyle);
+for (CollapsedBorder* border = borders.nextBorder(); border; border = borders.nextBorder()) {
+if (border->borderValue == *table()->currentBorderStyle())
+drawLineForBoxSide(graphicsContext, border->x1, border->y1, border->x2, border->y2, border->side,
+border->borderValue.color(), border->style, 0, 0);
+}
+}
+void RenderTableCell::paintBackgroundsBehindCell(PaintInfo& paintInfo, int tx, int ty, RenderObject* backgroundObject)
+{
+if (!paintInfo.shouldPaintWithinRoot(this))
+return;
+if (!backgroundObject)
+return;
+if (style()->visibility() != VISIBLE)
+return;
+RenderTable* tableElt = table();
+if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
+return;
+if (backgroundObject != this) {
+tx += x();
+ty += y();
+}
+int w = width();
+int h = height();
+Color c = backgroundObject->style()->visitedDependentColor(CSSPropertyBackgroundColor);
+const FillLayer* bgLayer = backgroundObject->style()->backgroundLayers();
+if (bgLayer->hasImage() || c.isValid()) {
+// We have to clip here because the background would paint
+// on top of the borders otherwise.  This only matters for cells and rows.
+bool shouldClip = backgroundObject->hasLayer() && (backgroundObject == this || backgroundObject == parent()) && tableElt->collapseBorders();
+if (shouldClip) {
+IntRect clipRect(tx + borderLeft(), ty + borderTop(),
+w - borderLeft() - borderRight(), h - borderTop() - borderBottom());
+paintInfo.context->save();
+paintInfo.context->clip(clipRect);
+}
+paintFillLayers(paintInfo, c, bgLayer, tx, ty, w, h, CompositeSourceOver, backgroundObject);
+if (shouldClip)
+paintInfo.context->restore();
+}
+}
+void RenderTableCell::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
+{
+if (!paintInfo.shouldPaintWithinRoot(this))
+return;
+RenderTable* tableElt = table();
+if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
+return;
+int w = width();
+int h = height();
+if (style()->boxShadow())
+paintBoxShadow(paintInfo.context, tx, ty, w, h, style(), Normal);
+// Paint our cell background.
+paintBackgroundsBehindCell(paintInfo, tx, ty, this);
+if (style()->boxShadow())
+paintBoxShadow(paintInfo.context, tx, ty, w, h, style(), Inset);
+if (!style()->hasBorder() || tableElt->collapseBorders())
+return;
+paintBorder(paintInfo.context, tx, ty, w, h, style());
+}
+void RenderTableCell::paintMask(PaintInfo& paintInfo, int tx, int ty)
+{
+if (style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
+return;
+RenderTable* tableElt = table();
+if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
+return;
+int w = width();
+int h = height();
+paintMaskImages(paintInfo, tx, ty, w, h);
+}
+} // namespace WebCore