Source/WebCore/rendering/RenderTableSection.cpp

   1 /*
   2  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
   3  *           (C) 1997 Torben Weis (weis@kde.org)
   4  *           (C) 1998 Waldo Bastian (bastian@kde.org)
   5  *           (C) 1999 Lars Knoll (knoll@kde.org)
   6  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
   7  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
   8  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Library General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Library General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Library General Public License
  21  * along with this library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23  * Boston, MA 02110-1301, USA.
  24  */
  25
  26 #include "config.h"
  27 #include "RenderTableSection.h"
  28 #include "CachedImage.h"
  29 #include "Document.h"
  30 #include "HitTestResult.h"
  31 #include "HTMLNames.h"
  32 #include "PaintInfo.h"
  33 #include "RenderTableCell.h"
  34 #include "RenderTableCol.h"
  35 #include "RenderTableRow.h"
  36 #include "RenderView.h"
  37 #include <limits>
  38 #include <wtf/HashSet.h>
  39 #include <wtf/Vector.h>
  40
  41 using namespace std;
  42
  43 namespace WebCore {
  44
  45 using namespace HTMLNames;
  46
  47 // Those 2 variables are used to balance the memory consumption vs the repaint time on big tables.
  48 static unsigned gMinTableSizeToUseFastPaintPathWithOverflowingCell = 75 * 75;
  49 static float gMaxAllowedOverflowingCellRatioForFastPaintPath = 0.1f;
  50
  51 static inline void setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(RenderTableSection::RowStruct* row)
  52 {
  53     ASSERT(row && row->rowRenderer);
  54     row->logicalHeight = row->rowRenderer->style()->logicalHeight();
  55     if (row->logicalHeight.isRelative())
  56         row->logicalHeight = Length();
  57 }
  58
  59 RenderTableSection::RenderTableSection(Node* node)
  60     : RenderBox(node)
  61     , m_gridRows(0)
  62     , m_cCol(0)
  63     , m_cRow(-1)
  64     , m_outerBorderStart(0)
  65     , m_outerBorderEnd(0)
  66     , m_outerBorderBefore(0)
  67     , m_outerBorderAfter(0)
  68     , m_needsCellRecalc(false)
  69     , m_hasMultipleCellLevels(false)
  70 {
  71     // init RenderObject attributes
  72     setInline(false); // our object is not Inline
  73 }
  74
  75 RenderTableSection::~RenderTableSection()
  76 {
  77     clearGrid();
  78 }
  79
  80 void RenderTableSection::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
  81 {
  82     RenderBox::styleDidChange(diff, oldStyle);
  83     propagateStyleToAnonymousChildren();
  84 }
  85
  86 void RenderTableSection::willBeDestroyed()
  87 {
  88     RenderTable* recalcTable = table();
  89
  90     RenderBox::willBeDestroyed();
  91
  92     // recalc cell info because RenderTable has unguarded pointers
  93     // stored that point to this RenderTableSection.
  94     if (recalcTable)
  95         recalcTable->setNeedsSectionRecalc();
  96 }
  97
  98 void RenderTableSection::addChild(RenderObject* child, RenderObject* beforeChild)
  99 {
 100     // Make sure we don't append things after :after-generated content if we have it.
 101     if (!beforeChild && isAfterContent(lastChild()))
 102         beforeChild = lastChild();
 103
 104     if (!child->isTableRow()) {
 105         RenderObject* last = beforeChild;
 106         if (!last)
 107             last = lastChild();
 108         if (last && last->isAnonymous() && !last->isBeforeOrAfterContent()) {
 109             if (beforeChild == last)
 110                 beforeChild = last->firstChild();
 111             last->addChild(child, beforeChild);
 112             return;
 113         }
 114
 115         // If beforeChild is inside an anonymous cell/row, insert into the cell or into
 116         // the anonymous row containing it, if there is one.
 117         RenderObject* lastBox = last;
 118         while (lastBox && lastBox->parent()->isAnonymous() && !lastBox->isTableRow())
 119             lastBox = lastBox->parent();
 120         if (lastBox && lastBox->isAnonymous() && !lastBox->isBeforeOrAfterContent()) {
 121             lastBox->addChild(child, beforeChild);
 122             return;
 123         }
 124
 125         RenderObject* row = new (renderArena()) RenderTableRow(document() /* anonymous table row */);
 126         RefPtr<RenderStyle> newStyle = RenderStyle::create();
 127         newStyle->inheritFrom(style());
 128         newStyle->setDisplay(TABLE_ROW);
 129         row->setStyle(newStyle.release());
 130         addChild(row, beforeChild);
 131         row->addChild(child);
 132         return;
 133     }
 134
 135     if (beforeChild)
 136         setNeedsCellRecalc();
 137
 138     ++m_cRow;
 139     m_cCol = 0;
 140
 141     // make sure we have enough rows
 142     if (!ensureRows(m_cRow + 1))
 143         return;
 144
 145     m_grid[m_cRow].rowRenderer = toRenderTableRow(child);
 146
 147     if (!beforeChild)
 148         setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(&m_grid[m_cRow]);
 149
 150     // If the next renderer is actually wrapped in an anonymous table row, we need to go up and find that.
 151     while (beforeChild && beforeChild->parent() != this)
 152         beforeChild = beforeChild->parent();
 153
 154     ASSERT(!beforeChild || beforeChild->isTableRow());
 155     RenderBox::addChild(child, beforeChild);
 156     toRenderTableRow(child)->updateBeforeAndAfterContent();
 157 }
 158
 159 void RenderTableSection::removeChild(RenderObject* oldChild)
 160 {
 161     setNeedsCellRecalc();
 162     RenderBox::removeChild(oldChild);
 163 }
 164
 165 bool RenderTableSection::ensureRows(int numRows)
 166 {
 167     int nRows = m_gridRows;
 168     if (numRows > nRows) {
 169         if (numRows > static_cast<int>(m_grid.size())) {
 170             size_t maxSize = numeric_limits<size_t>::max() / sizeof(RowStruct);
 171             if (static_cast<size_t>(numRows) > maxSize)
 172                 return false;
 173             m_grid.grow(numRows);
 174         }
 175         m_gridRows = numRows;
 176         int nCols = max(1, table()->numEffCols());
 177         for (int r = nRows; r < numRows; r++) {
 178             m_grid[r].row = new Row(nCols);
 179             m_grid[r].rowRenderer = 0;
 180             m_grid[r].baseline = 0;
 181             m_grid[r].logicalHeight = Length();
 182         }
 183     }
 184
 185     return true;
 186 }
 187
 188 void RenderTableSection::addCell(RenderTableCell* cell, RenderTableRow* row)
 189 {
 190     int rSpan = cell->rowSpan();
 191     int cSpan = cell->colSpan();
 192     Vector<RenderTable::ColumnStruct>& columns = table()->columns();
 193     int nCols = columns.size();
 194
 195     // ### mozilla still seems to do the old HTML way, even for strict DTD
 196     // (see the annotation on table cell layouting in the CSS specs and the testcase below:
 197     // <TABLE border>
 198     // <TR><TD>1 <TD rowspan="2">2 <TD>3 <TD>4
 199     // <TR><TD colspan="2">5
 200     // </TABLE>
 201     while (m_cCol < nCols && (cellAt(m_cRow, m_cCol).hasCells() || cellAt(m_cRow, m_cCol).inColSpan))
 202         m_cCol++;
 203
 204     if (rSpan == 1) {
 205         // we ignore height settings on rowspan cells
 206         Length logicalHeight = cell->style()->logicalHeight();
 207         if (logicalHeight.isPositive() || (logicalHeight.isRelative() && logicalHeight.value() >= 0)) {
 208             Length cRowLogicalHeight = m_grid[m_cRow].logicalHeight;
 209             switch (logicalHeight.type()) {
 210                 case Percent:
 211                     if (!(cRowLogicalHeight.isPercent()) ||
 212                         (cRowLogicalHeight.isPercent() && cRowLogicalHeight.percent() < logicalHeight.percent()))
 213                         m_grid[m_cRow].logicalHeight = logicalHeight;
 214                         break;
 215                 case Fixed:
 216                     if (cRowLogicalHeight.type() < Percent ||
 217                         (cRowLogicalHeight.isFixed() && cRowLogicalHeight.value() < logicalHeight.value()))
 218                         m_grid[m_cRow].logicalHeight = logicalHeight;
 219                     break;
 220                 case Relative:
 221                 default:
 222                     break;
 223             }
 224         }
 225     }
 226
 227     // make sure we have enough rows
 228     if (!ensureRows(m_cRow + rSpan))
 229         return;
 230
 231     m_grid[m_cRow].rowRenderer = row;
 232
 233     int col = m_cCol;
 234     // tell the cell where it is
 235     bool inColSpan = false;
 236     while (cSpan) {
 237         int currentSpan;
 238         if (m_cCol >= nCols) {
 239             table()->appendColumn(cSpan);
 240             currentSpan = cSpan;
 241         } else {
 242             if (cSpan < (int)columns[m_cCol].span)
 243                 table()->splitColumn(m_cCol, cSpan);
 244             currentSpan = columns[m_cCol].span;
 245         }
 246         for (int r = 0; r < rSpan; r++) {
 247             CellStruct& c = cellAt(m_cRow + r, m_cCol);
 248             ASSERT(cell);
 249             c.cells.append(cell);
 250             // If cells overlap then we take the slow path for painting.
 251             if (c.cells.size() > 1)
 252                 m_hasMultipleCellLevels = true;
 253             if (inColSpan)
 254                 c.inColSpan = true;
 255         }
 256         m_cCol++;
 257         cSpan -= currentSpan;
 258         inColSpan = true;
 259     }
 260     cell->setRow(m_cRow);
 261     cell->setCol(table()->effColToCol(col));
 262 }
 263
 264 void RenderTableSection::setCellLogicalWidths()
 265 {
 266     Vector<LayoutUnit>& columnPos = table()->columnPositions();
 267
 268     LayoutStateMaintainer statePusher(view());
 269
 270     for (int i = 0; i < m_gridRows; i++) {
 271         Row& row = *m_grid[i].row;
 272         int cols = row.size();
 273         for (int j = 0; j < cols; j++) {
 274             CellStruct& current = row[j];
 275             RenderTableCell* cell = current.primaryCell();
 276             if (!cell || current.inColSpan)
 277               continue;
 278             int endCol = j;
 279             int cspan = cell->colSpan();
 280             while (cspan && endCol < cols) {
 281                 ASSERT(endCol < (int)table()->columns().size());
 282                 cspan -= table()->columns()[endCol].span;
 283                 endCol++;
 284             }
 285             int w = columnPos[endCol] - columnPos[j] - table()->hBorderSpacing();
 286             int oldLogicalWidth = cell->logicalWidth();
 287             if (w != oldLogicalWidth) {
 288                 cell->setNeedsLayout(true);
 289                 if (!table()->selfNeedsLayout() && cell->checkForRepaintDuringLayout()) {
 290                     if (!statePusher.didPush()) {
 291                         // Technically, we should also push state for the row, but since
 292                         // rows don't push a coordinate transform, that's not necessary.
 293                         statePusher.push(this, IntSize(x(), y()));
 294                     }
 295                     cell->repaint();
 296                 }
 297                 cell->updateLogicalWidth(w);
 298             }
 299         }
 300     }
 301
 302     statePusher.pop(); // only pops if we pushed
 303 }
 304
 305 LayoutUnit RenderTableSection::calcRowLogicalHeight()
 306 {
 307 #ifndef NDEBUG
 308     setNeedsLayoutIsForbidden(true);
 309 #endif
 310
 311     ASSERT(!needsLayout());
 312
 313     RenderTableCell* cell;
 314
 315     LayoutUnit spacing = table()->vBorderSpacing();
 316
 317     LayoutStateMaintainer statePusher(view());
 318
 319     m_rowPos.resize(m_gridRows + 1);
 320     m_rowPos[0] = spacing;
 321
 322     for (int r = 0; r < m_gridRows; r++) {
 323         m_rowPos[r + 1] = 0;
 324         m_grid[r].baseline = 0;
 325         LayoutUnit baseline = 0;
 326         LayoutUnit bdesc = 0;
 327         LayoutUnit ch = m_grid[r].logicalHeight.calcMinValue(0);
 328         LayoutUnit pos = m_rowPos[r] + ch + (m_grid[r].rowRenderer ? spacing : 0);
 329
 330         m_rowPos[r + 1] = max(m_rowPos[r + 1], pos);
 331
 332         Row* row = m_grid[r].row;
 333         int totalCols = row->size();
 334
 335         for (int c = 0; c < totalCols; c++) {
 336             CellStruct& current = cellAt(r, c);
 337             cell = current.primaryCell();
 338
 339             if (!cell || current.inColSpan)
 340                 continue;
 341
 342             if ((cell->row() + cell->rowSpan() - 1) > r)
 343                 continue;
 344
 345             int indx = max(r - cell->rowSpan() + 1, 0);
 346
 347             if (cell->hasOverrideHeight()) {
 348                 if (!statePusher.didPush()) {
 349                     // Technically, we should also push state for the row, but since
 350                     // rows don't push a coordinate transform, that's not necessary.
 351                     statePusher.push(this, locationOffset());
 352                 }
 353                 cell->clearIntrinsicPadding();
 354                 cell->clearOverrideSize();
 355                 cell->setChildNeedsLayout(true, false);
 356                 cell->layoutIfNeeded();
 357             }
 358
 359             LayoutUnit adjustedPaddingBefore = cell->paddingBefore() - cell->intrinsicPaddingBefore();
 360             LayoutUnit adjustedPaddingAfter = cell->paddingAfter() - cell->intrinsicPaddingAfter();
 361             LayoutUnit adjustedLogicalHeight = cell->logicalHeight() - (cell->intrinsicPaddingBefore() + cell->intrinsicPaddingAfter());
 362
 363             // Explicit heights use the border box in quirks mode.  In strict mode do the right
 364             // thing and actually add in the border and padding.
 365             ch = cell->style()->logicalHeight().calcValue(0) +
 366                 (document()->inQuirksMode() ? 0 : (adjustedPaddingBefore + adjustedPaddingAfter +
 367                                                    cell->borderBefore() + cell->borderAfter()));
 368             ch = max(ch, adjustedLogicalHeight);
 369
 370             pos = m_rowPos[indx] + ch + (m_grid[r].rowRenderer ? spacing : 0);
 371
 372             m_rowPos[r + 1] = max(m_rowPos[r + 1], pos);
 373
 374             // find out the baseline
 375             EVerticalAlign va = cell->style()->verticalAlign();
 376             if (va == BASELINE || va == TEXT_BOTTOM || va == TEXT_TOP || va == SUPER || va == SUB) {
 377                 LayoutUnit b = cell->cellBaselinePosition();
 378                 if (b > cell->borderBefore() + cell->paddingBefore()) {
 379                     baseline = max(baseline, b - cell->intrinsicPaddingBefore());
 380                     bdesc = max(bdesc, m_rowPos[indx] + ch - (b - cell->intrinsicPaddingBefore()));
 381                 }
 382             }
 383         }
 384
 385         // do we have baseline aligned elements?
 386         if (baseline) {
 387             // increase rowheight if baseline requires
 388             m_rowPos[r + 1] = max(m_rowPos[r + 1], baseline + bdesc + (m_grid[r].rowRenderer ? spacing : 0));
 389             m_grid[r].baseline = baseline;
 390         }
 391
 392         m_rowPos[r + 1] = max(m_rowPos[r + 1], m_rowPos[r]);
 393     }
 394
 395 #ifndef NDEBUG
 396     setNeedsLayoutIsForbidden(false);
 397 #endif
 398
 399     ASSERT(!needsLayout());
 400
 401     statePusher.pop();
 402
 403     return m_rowPos[m_gridRows];
 404 }
 405
 406 void RenderTableSection::layout()
 407 {
 408     ASSERT(needsLayout());
 409
 410     LayoutStateMaintainer statePusher(view(), this, locationOffset(), style()->isFlippedBlocksWritingMode());
 411     for (RenderObject* child = children()->firstChild(); child; child = child->nextSibling()) {
 412         if (child->isTableRow()) {
 413             child->layoutIfNeeded();
 414             ASSERT(!child->needsLayout());
 415         }
 416     }
 417     statePusher.pop();
 418     setNeedsLayout(false);
 419 }
 420
 421 LayoutUnit RenderTableSection::layoutRows(LayoutUnit toAdd)
 422 {
 423 #ifndef NDEBUG
 424     setNeedsLayoutIsForbidden(true);
 425 #endif
 426
 427     ASSERT(!needsLayout());
 428
 429     LayoutUnit rHeight;
 430     int rindx;
 431     int totalRows = m_gridRows;
 432
 433     // Set the width of our section now.  The rows will also be this width.
 434     setLogicalWidth(table()->contentLogicalWidth());
 435     m_overflow.clear();
 436     m_overflowingCells.clear();
 437     m_forceSlowPaintPathWithOverflowingCell = false;
 438
 439     if (toAdd && totalRows && (m_rowPos[totalRows] || !nextSibling())) {
 440         LayoutUnit totalHeight = m_rowPos[totalRows] + toAdd;
 441
 442         LayoutUnit dh = toAdd;
 443         int totalPercent = 0;
 444         int numAuto = 0;
 445         for (int r = 0; r < totalRows; r++) {
 446             if (m_grid[r].logicalHeight.isAuto())
 447                 numAuto++;
 448             else if (m_grid[r].logicalHeight.isPercent())
 449                 totalPercent += m_grid[r].logicalHeight.percent();
 450         }
 451         if (totalPercent) {
 452             // try to satisfy percent
 453             LayoutUnit add = 0;
 454             totalPercent = min(totalPercent, 100);
 455             int rh = m_rowPos[1] - m_rowPos[0];
 456             for (int r = 0; r < totalRows; r++) {
 457                 if (totalPercent > 0 && m_grid[r].logicalHeight.isPercent()) {
 458                     LayoutUnit toAdd = min(dh, static_cast<LayoutUnit>((totalHeight * m_grid[r].logicalHeight.percent() / 100) - rh));
 459                     // If toAdd is negative, then we don't want to shrink the row (this bug
 460                     // affected Outlook Web Access).
 461                     toAdd = max<LayoutUnit>(0, toAdd);
 462                     add += toAdd;
 463                     dh -= toAdd;
 464                     totalPercent -= m_grid[r].logicalHeight.percent();
 465                 }
 466                 if (r < totalRows - 1)
 467                     rh = m_rowPos[r + 2] - m_rowPos[r + 1];
 468                 m_rowPos[r + 1] += add;
 469             }
 470         }
 471         if (numAuto) {
 472             // distribute over variable cols
 473             LayoutUnit add = 0;
 474             for (int r = 0; r < totalRows; r++) {
 475                 if (numAuto > 0 && m_grid[r].logicalHeight.isAuto()) {
 476                     LayoutUnit toAdd = dh / numAuto;
 477                     add += toAdd;
 478                     dh -= toAdd;
 479                     numAuto--;
 480                 }
 481                 m_rowPos[r + 1] += add;
 482             }
 483         }
 484         if (dh > 0 && m_rowPos[totalRows]) {
 485             // if some left overs, distribute equally.
 486             LayoutUnit tot = m_rowPos[totalRows];
 487             LayoutUnit add = 0;
 488             LayoutUnit prev = m_rowPos[0];
 489             for (int r = 0; r < totalRows; r++) {
 490                 // weight with the original height
 491                 add += dh * (m_rowPos[r + 1] - prev) / tot;
 492                 prev = m_rowPos[r + 1];
 493                 m_rowPos[r + 1] += add;
 494             }
 495         }
 496     }
 497
 498     LayoutUnit hspacing = table()->hBorderSpacing();
 499     LayoutUnit vspacing = table()->vBorderSpacing();
 500     LayoutUnit nEffCols = table()->numEffCols();
 501
 502     LayoutStateMaintainer statePusher(view(), this, LayoutSize(x(), y()), style()->isFlippedBlocksWritingMode());
 503
 504     for (int r = 0; r < totalRows; r++) {
 505         // Set the row's x/y position and width/height.
 506         if (RenderTableRow* rowRenderer = m_grid[r].rowRenderer) {
 507             rowRenderer->setLocation(LayoutPoint(0, m_rowPos[r]));
 508             rowRenderer->setLogicalWidth(logicalWidth());
 509             rowRenderer->setLogicalHeight(m_rowPos[r + 1] - m_rowPos[r] - vspacing);
 510             rowRenderer->updateLayerTransform();
 511         }
 512
 513         for (int c = 0; c < nEffCols; c++) {
 514             CellStruct& cs = cellAt(r, c);
 515             RenderTableCell* cell = cs.primaryCell();
 516
 517             if (!cell || cs.inColSpan)
 518                 continue;
 519
 520             rindx = cell->row();
 521             rHeight = m_rowPos[rindx + cell->rowSpan()] - m_rowPos[rindx] - vspacing;
 522
 523             // Force percent height children to lay themselves out again.
 524             // This will cause these children to grow to fill the cell.
 525             // FIXME: There is still more work to do here to fully match WinIE (should
 526             // it become necessary to do so).  In quirks mode, WinIE behaves like we
 527             // do, but it will clip the cells that spill out of the table section.  In
 528             // strict mode, Mozilla and WinIE both regrow the table to accommodate the
 529             // new height of the cell (thus letting the percentages cause growth one
 530             // time only).  We may also not be handling row-spanning cells correctly.
 531             //
 532             // Note also the oddity where replaced elements always flex, and yet blocks/tables do
 533             // not necessarily flex.  WinIE is crazy and inconsistent, and we can't hope to
 534             // match the behavior perfectly, but we'll continue to refine it as we discover new
 535             // bugs. :)
 536             bool cellChildrenFlex = false;
 537             bool flexAllChildren = cell->style()->logicalHeight().isFixed()
 538                 || (!table()->style()->logicalHeight().isAuto() && rHeight != cell->logicalHeight());
 539
 540             for (RenderObject* o = cell->firstChild(); o; o = o->nextSibling()) {
 541                 if (!o->isText() && o->style()->logicalHeight().isPercent() && (flexAllChildren || o->isReplaced() || (o->isBox() && toRenderBox(o)->scrollsOverflow()))) {
 542                     // Tables with no sections do not flex.
 543                     if (!o->isTable() || toRenderTable(o)->hasSections()) {
 544                         o->setNeedsLayout(true, false);
 545                         cellChildrenFlex = true;
 546                     }
 547                 }
 548             }
 549
 550             if (HashSet<RenderBox*>* percentHeightDescendants = cell->percentHeightDescendants()) {
 551                 HashSet<RenderBox*>::iterator end = percentHeightDescendants->end();
 552                 for (HashSet<RenderBox*>::iterator it = percentHeightDescendants->begin(); it != end; ++it) {
 553                     RenderBox* box = *it;
 554                     if (!box->isReplaced() && !box->scrollsOverflow() && !flexAllChildren)
 555                         continue;
 556
 557                     while (box != cell) {
 558                         if (box->normalChildNeedsLayout())
 559                             break;
 560                         box->setChildNeedsLayout(true, false);
 561                         box = box->containingBlock();
 562                         ASSERT(box);
 563                         if (!box)
 564                             break;
 565                     }
 566                     cellChildrenFlex = true;
 567                 }
 568             }
 569
 570             if (cellChildrenFlex) {
 571                 cell->setChildNeedsLayout(true, false);
 572                 // Alignment within a cell is based off the calculated
 573                 // height, which becomes irrelevant once the cell has
 574                 // been resized based off its percentage.
 575                 cell->setOverrideHeightFromRowHeight(rHeight);
 576                 cell->layoutIfNeeded();
 577
 578                 // If the baseline moved, we may have to update the data for our row. Find out the new baseline.
 579                 EVerticalAlign va = cell->style()->verticalAlign();
 580                 if (va == BASELINE || va == TEXT_BOTTOM || va == TEXT_TOP || va == SUPER || va == SUB) {
 581                     LayoutUnit baseline = cell->cellBaselinePosition();
 582                     if (baseline > cell->borderBefore() + cell->paddingBefore())
 583                         m_grid[r].baseline = max(m_grid[r].baseline, baseline);
 584                 }
 585             }
 586
 587             LayoutUnit oldIntrinsicPaddingBefore = cell->intrinsicPaddingBefore();
 588             LayoutUnit oldIntrinsicPaddingAfter = cell->intrinsicPaddingAfter();
 589             LayoutUnit logicalHeightWithoutIntrinsicPadding = cell->logicalHeight() - oldIntrinsicPaddingBefore - oldIntrinsicPaddingAfter;
 590
 591             LayoutUnit intrinsicPaddingBefore = 0;
 592             switch (cell->style()->verticalAlign()) {
 593                 case SUB:
 594                 case SUPER:
 595                 case TEXT_TOP:
 596                 case TEXT_BOTTOM:
 597                 case BASELINE: {
 598                     LayoutUnit b = cell->cellBaselinePosition();
 599                     if (b > cell->borderBefore() + cell->paddingBefore())
 600                         intrinsicPaddingBefore = getBaseline(r) - (b - oldIntrinsicPaddingBefore);
 601                     break;
 602                 }
 603                 case TOP:
 604                     break;
 605                 case MIDDLE:
 606                     intrinsicPaddingBefore = (rHeight - logicalHeightWithoutIntrinsicPadding) / 2;
 607                     break;
 608                 case BOTTOM:
 609                     intrinsicPaddingBefore = rHeight - logicalHeightWithoutIntrinsicPadding;
 610                     break;
 611                 default:
 612                     break;
 613             }
 614
 615             LayoutUnit intrinsicPaddingAfter = rHeight - logicalHeightWithoutIntrinsicPadding - intrinsicPaddingBefore;
 616             cell->setIntrinsicPaddingBefore(intrinsicPaddingBefore);
 617             cell->setIntrinsicPaddingAfter(intrinsicPaddingAfter);
 618
 619             LayoutRect oldCellRect(cell->x(), cell->y() , cell->width(), cell->height());
 620
 621             LayoutPoint cellLocation(0, m_rowPos[rindx]);
 622             if (!style()->isLeftToRightDirection())
 623                 cellLocation.setX(table()->columnPositions()[nEffCols] - table()->columnPositions()[table()->colToEffCol(cell->col() + cell->colSpan())] + hspacing);
 624             else
 625                 cellLocation.setX(table()->columnPositions()[c] + hspacing);
 626             cell->setLogicalLocation(cellLocation);
 627             view()->addLayoutDelta(oldCellRect.location() - cell->location());
 628
 629             if (intrinsicPaddingBefore != oldIntrinsicPaddingBefore || intrinsicPaddingAfter != oldIntrinsicPaddingAfter)
 630                 cell->setNeedsLayout(true, false);
 631
 632             if (!cell->needsLayout() && view()->layoutState()->pageLogicalHeight() && view()->layoutState()->pageLogicalOffset(cell->logicalTop()) != cell->pageLogicalOffset())
 633                 cell->setChildNeedsLayout(true, false);
 634
 635             cell->layoutIfNeeded();
 636
 637             // FIXME: Make pagination work with vertical tables.
 638             if (style()->isHorizontalWritingMode() && view()->layoutState()->pageLogicalHeight() && cell->height() != rHeight)
 639                 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.
 640
 641             LayoutSize childOffset(cell->location() - oldCellRect.location());
 642             if (childOffset.width() || childOffset.height()) {
 643                 view()->addLayoutDelta(childOffset);
 644
 645                 // If the child moved, we have to repaint it as well as any floating/positioned
 646                 // descendants.  An exception is if we need a layout.  In this case, we know we're going to
 647                 // repaint ourselves (and the child) anyway.
 648                 if (!table()->selfNeedsLayout() && cell->checkForRepaintDuringLayout())
 649                     cell->repaintDuringLayoutIfMoved(oldCellRect);
 650             }
 651         }
 652     }
 653
 654 #ifndef NDEBUG
 655     setNeedsLayoutIsForbidden(false);
 656 #endif
 657
 658     ASSERT(!needsLayout());
 659
 660     setLogicalHeight(m_rowPos[totalRows]);
 661
 662     unsigned totalCellsCount = nEffCols * totalRows;
 663     int maxAllowedOverflowingCellsCount = totalCellsCount < gMinTableSizeToUseFastPaintPathWithOverflowingCell ? 0 : gMaxAllowedOverflowingCellRatioForFastPaintPath * totalCellsCount;
 664
 665 #ifndef NDEBUG
 666     bool hasOverflowingCell = false;
 667 #endif
 668     // Now that our height has been determined, add in overflow from cells.
 669     for (int r = 0; r < totalRows; r++) {
 670         for (int c = 0; c < nEffCols; c++) {
 671             CellStruct& cs = cellAt(r, c);
 672             RenderTableCell* cell = cs.primaryCell();
 673             if (!cell || cs.inColSpan)
 674                 continue;
 675             if (r < totalRows - 1 && cell == primaryCellAt(r + 1, c))
 676                 continue;
 677             addOverflowFromChild(cell);
 678 #ifndef NDEBUG
 679             hasOverflowingCell |= cell->hasVisualOverflow();
 680 #endif
 681             if (cell->hasVisualOverflow() && !m_forceSlowPaintPathWithOverflowingCell) {
 682                 m_overflowingCells.add(cell);
 683                 if (m_overflowingCells.size() > maxAllowedOverflowingCellsCount) {
 684                     // We need to set m_forcesSlowPaintPath only if there is a least one overflowing cells as the hit testing code rely on this information.
 685                     m_forceSlowPaintPathWithOverflowingCell = true;
 686                     // The slow path does not make any use of the overflowing cells info, don't hold on to the memory.
 687                     m_overflowingCells.clear();
 688                 }
 689             }
 690         }
 691     }
 692
 693     ASSERT(hasOverflowingCell == this->hasOverflowingCell());
 694
 695     statePusher.pop();
 696     return height();
 697 }
 698
 699 LayoutUnit RenderTableSection::calcOuterBorderBefore() const
 700 {
 701     int totalCols = table()->numEffCols();
 702     if (!m_gridRows || !totalCols)
 703         return 0;
 704
 705     unsigned borderWidth = 0;
 706
 707     const BorderValue& sb = style()->borderBefore();
 708     if (sb.style() == BHIDDEN)
 709         return -1;
 710     if (sb.style() > BHIDDEN)
 711         borderWidth = sb.width();
 712
 713     const BorderValue& rb = firstChild()->style()->borderBefore();
 714     if (rb.style() == BHIDDEN)
 715         return -1;
 716     if (rb.style() > BHIDDEN && rb.width() > borderWidth)
 717         borderWidth = rb.width();
 718
 719     bool allHidden = true;
 720     for (int c = 0; c < totalCols; c++) {
 721         const CellStruct& current = cellAt(0, c);
 722         if (current.inColSpan || !current.hasCells())
 723             continue;
 724         const BorderValue& cb = current.primaryCell()->style()->borderBefore(); // FIXME: Make this work with perpendicular and flipped cells.
 725         // FIXME: Don't repeat for the same col group
 726         RenderTableCol* colGroup = table()->colElement(c);
 727         if (colGroup) {
 728             const BorderValue& gb = colGroup->style()->borderBefore();
 729             if (gb.style() == BHIDDEN || cb.style() == BHIDDEN)
 730                 continue;
 731             allHidden = false;
 732             if (gb.style() > BHIDDEN && gb.width() > borderWidth)
 733                 borderWidth = gb.width();
 734             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
 735                 borderWidth = cb.width();
 736         } else {
 737             if (cb.style() == BHIDDEN)
 738                 continue;
 739             allHidden = false;
 740             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
 741                 borderWidth = cb.width();
 742         }
 743     }
 744     if (allHidden)
 745         return -1;
 746
 747     return borderWidth / 2;
 748 }
 749
 750 LayoutUnit RenderTableSection::calcOuterBorderAfter() const
 751 {
 752     int totalCols = table()->numEffCols();
 753     if (!m_gridRows || !totalCols)
 754         return 0;
 755
 756     unsigned borderWidth = 0;
 757
 758     const BorderValue& sb = style()->borderAfter();
 759     if (sb.style() == BHIDDEN)
 760         return -1;
 761     if (sb.style() > BHIDDEN)
 762         borderWidth = sb.width();
 763
 764     const BorderValue& rb = lastChild()->style()->borderAfter();
 765     if (rb.style() == BHIDDEN)
 766         return -1;
 767     if (rb.style() > BHIDDEN && rb.width() > borderWidth)
 768         borderWidth = rb.width();
 769
 770     bool allHidden = true;
 771     for (int c = 0; c < totalCols; c++) {
 772         const CellStruct& current = cellAt(m_gridRows - 1, c);
 773         if (current.inColSpan || !current.hasCells())
 774             continue;
 775         const BorderValue& cb = current.primaryCell()->style()->borderAfter(); // FIXME: Make this work with perpendicular and flipped cells.
 776         // FIXME: Don't repeat for the same col group
 777         RenderTableCol* colGroup = table()->colElement(c);
 778         if (colGroup) {
 779             const BorderValue& gb = colGroup->style()->borderAfter();
 780             if (gb.style() == BHIDDEN || cb.style() == BHIDDEN)
 781                 continue;
 782             allHidden = false;
 783             if (gb.style() > BHIDDEN && gb.width() > borderWidth)
 784                 borderWidth = gb.width();
 785             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
 786                 borderWidth = cb.width();
 787         } else {
 788             if (cb.style() == BHIDDEN)
 789                 continue;
 790             allHidden = false;
 791             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
 792                 borderWidth = cb.width();
 793         }
 794     }
 795     if (allHidden)
 796         return -1;
 797
 798     return (borderWidth + 1) / 2;
 799 }
 800
 801 LayoutUnit RenderTableSection::calcOuterBorderStart() const
 802 {
 803     int totalCols = table()->numEffCols();
 804     if (!m_gridRows || !totalCols)
 805         return 0;
 806
 807     unsigned borderWidth = 0;
 808
 809     const BorderValue& sb = style()->borderStart();
 810     if (sb.style() == BHIDDEN)
 811         return -1;
 812     if (sb.style() > BHIDDEN)
 813         borderWidth = sb.width();
 814
 815     if (RenderTableCol* colGroup = table()->colElement(0)) {
 816         const BorderValue& gb = colGroup->style()->borderStart();
 817         if (gb.style() == BHIDDEN)
 818             return -1;
 819         if (gb.style() > BHIDDEN && gb.width() > borderWidth)
 820             borderWidth = gb.width();
 821     }
 822
 823     bool allHidden = true;
 824     for (int r = 0; r < m_gridRows; r++) {
 825         const CellStruct& current = cellAt(r, 0);
 826         if (!current.hasCells())
 827             continue;
 828         // FIXME: Don't repeat for the same cell
 829         const BorderValue& cb = current.primaryCell()->style()->borderStart(); // FIXME: Make this work with perpendicular and flipped cells.
 830         const BorderValue& rb = current.primaryCell()->parent()->style()->borderStart();
 831         if (cb.style() == BHIDDEN || rb.style() == BHIDDEN)
 832             continue;
 833         allHidden = false;
 834         if (cb.style() > BHIDDEN && cb.width() > borderWidth)
 835             borderWidth = cb.width();
 836         if (rb.style() > BHIDDEN && rb.width() > borderWidth)
 837             borderWidth = rb.width();
 838     }
 839     if (allHidden)
 840         return -1;
 841
 842     return (borderWidth + (table()->style()->isLeftToRightDirection() ? 0 : 1)) / 2;
 843 }
 844
 845 LayoutUnit RenderTableSection::calcOuterBorderEnd() const
 846 {
 847     int totalCols = table()->numEffCols();
 848     if (!m_gridRows || !totalCols)
 849         return 0;
 850
 851     unsigned borderWidth = 0;
 852
 853     const BorderValue& sb = style()->borderEnd();
 854     if (sb.style() == BHIDDEN)
 855         return -1;
 856     if (sb.style() > BHIDDEN)
 857         borderWidth = sb.width();
 858
 859     if (RenderTableCol* colGroup = table()->colElement(totalCols - 1)) {
 860         const BorderValue& gb = colGroup->style()->borderEnd();
 861         if (gb.style() == BHIDDEN)
 862             return -1;
 863         if (gb.style() > BHIDDEN && gb.width() > borderWidth)
 864             borderWidth = gb.width();
 865     }
 866
 867     bool allHidden = true;
 868     for (int r = 0; r < m_gridRows; r++) {
 869         const CellStruct& current = cellAt(r, totalCols - 1);
 870         if (!current.hasCells())
 871             continue;
 872         // FIXME: Don't repeat for the same cell
 873         const BorderValue& cb = current.primaryCell()->style()->borderEnd(); // FIXME: Make this work with perpendicular and flipped cells.
 874         const BorderValue& rb = current.primaryCell()->parent()->style()->borderEnd();
 875         if (cb.style() == BHIDDEN || rb.style() == BHIDDEN)
 876             continue;
 877         allHidden = false;
 878         if (cb.style() > BHIDDEN && cb.width() > borderWidth)
 879             borderWidth = cb.width();
 880         if (rb.style() > BHIDDEN && rb.width() > borderWidth)
 881             borderWidth = rb.width();
 882     }
 883     if (allHidden)
 884         return -1;
 885
 886     return (borderWidth + (table()->style()->isLeftToRightDirection() ? 1 : 0)) / 2;
 887 }
 888
 889 void RenderTableSection::recalcOuterBorder()
 890 {
 891     m_outerBorderBefore = calcOuterBorderBefore();
 892     m_outerBorderAfter = calcOuterBorderAfter();
 893     m_outerBorderStart = calcOuterBorderStart();
 894     m_outerBorderEnd = calcOuterBorderEnd();
 895 }
 896
 897 LayoutUnit RenderTableSection::firstLineBoxBaseline() const
 898 {
 899     if (!m_gridRows)
 900         return -1;
 901
 902     LayoutUnit firstLineBaseline = m_grid[0].baseline;
 903     if (firstLineBaseline)
 904         return firstLineBaseline + m_rowPos[0];
 905
 906     firstLineBaseline = -1;
 907     Row* firstRow = m_grid[0].row;
 908     for (size_t i = 0; i < firstRow->size(); ++i) {
 909         CellStruct& cs = firstRow->at(i);
 910         RenderTableCell* cell = cs.primaryCell();
 911         if (cell)
 912             firstLineBaseline = max(firstLineBaseline, cell->logicalTop() + cell->paddingBefore() + cell->borderBefore() + cell->contentLogicalHeight());
 913     }
 914
 915     return firstLineBaseline;
 916 }
 917
 918 void RenderTableSection::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 919 {
 920     // put this back in when all layout tests can handle it
 921     // ASSERT(!needsLayout());
 922     // avoid crashing on bugs that cause us to paint with dirty layout
 923     if (needsLayout())
 924         return;
 925
 926     unsigned totalRows = m_gridRows;
 927     unsigned totalCols = table()->columns().size();
 928
 929     if (!totalRows || !totalCols)
 930         return;
 931
 932     LayoutPoint adjustedPaintOffset = paintOffset + location();
 933
 934     PaintPhase phase = paintInfo.phase;
 935     bool pushedClip = pushContentsClip(paintInfo, adjustedPaintOffset);
 936     paintObject(paintInfo, adjustedPaintOffset);
 937     if (pushedClip)
 938         popContentsClip(paintInfo, phase, adjustedPaintOffset);
 939 }
 940
 941 static inline bool compareCellPositions(RenderTableCell* elem1, RenderTableCell* elem2)
 942 {
 943     return elem1->row() < elem2->row();
 944 }
 945
 946 // This comparison is used only when we have overflowing cells as we have an unsorted array to sort. We thus need
 947 // to sort both on rows and columns to properly repaint.
 948 static inline bool compareCellPositionsWithOverflowingCells(RenderTableCell* elem1, RenderTableCell* elem2)
 949 {
 950     if (elem1->row() != elem2->row())
 951         return elem1->row() < elem2->row();
 952
 953     return elem1->col() < elem2->col();
 954 }
 955
 956 void RenderTableSection::paintCell(RenderTableCell* cell, PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 957 {
 958     LayoutPoint cellPoint = flipForWritingMode(cell, paintOffset, ParentToChildFlippingAdjustment);
 959     PaintPhase paintPhase = paintInfo.phase;
 960     RenderTableRow* row = toRenderTableRow(cell->parent());
 961
 962     if (paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) {
 963         // We need to handle painting a stack of backgrounds.  This stack (from bottom to top) consists of
 964         // the column group, column, row group, row, and then the cell.
 965         RenderObject* col = table()->colElement(cell->col());
 966         RenderObject* colGroup = 0;
 967         if (col && col->parent()->style()->display() == TABLE_COLUMN_GROUP)
 968             colGroup = col->parent();
 969
 970         // Column groups and columns first.
 971         // FIXME: Columns and column groups do not currently support opacity, and they are being painted "too late" in
 972         // the stack, since we have already opened a transparency layer (potentially) for the table row group.
 973         // Note that we deliberately ignore whether or not the cell has a layer, since these backgrounds paint "behind" the
 974         // cell.
 975         cell->paintBackgroundsBehindCell(paintInfo, cellPoint, colGroup);
 976         cell->paintBackgroundsBehindCell(paintInfo, cellPoint, col);
 977
 978         // Paint the row group next.
 979         cell->paintBackgroundsBehindCell(paintInfo, cellPoint, this);
 980
 981         // Paint the row next, but only if it doesn't have a layer.  If a row has a layer, it will be responsible for
 982         // painting the row background for the cell.
 983         if (!row->hasSelfPaintingLayer())
 984             cell->paintBackgroundsBehindCell(paintInfo, cellPoint, row);
 985     }
 986     if ((!cell->hasSelfPaintingLayer() && !row->hasSelfPaintingLayer()) || paintInfo.phase == PaintPhaseCollapsedTableBorders)
 987         cell->paint(paintInfo, cellPoint);
 988 }
 989
 990 void RenderTableSection::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 991 {
 992     // Check which rows and cols are visible and only paint these.
 993     unsigned totalRows = m_gridRows;
 994     unsigned totalCols = table()->columns().size();
 995
 996     PaintPhase paintPhase = paintInfo.phase;
 997
 998     LayoutUnit os = 2 * maximalOutlineSize(paintPhase);
 999     unsigned startrow = 0;
1000     unsigned endrow = totalRows;
1001
1002     LayoutRect localRepaintRect = paintInfo.rect;
1003     localRepaintRect.moveBy(-paintOffset);
1004     if (style()->isFlippedBlocksWritingMode()) {
1005         if (style()->isHorizontalWritingMode())
1006             localRepaintRect.setY(height() - localRepaintRect.maxY());
1007         else
1008             localRepaintRect.setX(width() - localRepaintRect.maxX());
1009     }
1010
1011     if (!m_forceSlowPaintPathWithOverflowingCell) {
1012         LayoutUnit before = (style()->isHorizontalWritingMode() ? localRepaintRect.y() : localRepaintRect.x()) - os;
1013         // binary search to find a row
1014         startrow = std::lower_bound(m_rowPos.begin(), m_rowPos.end(), before) - m_rowPos.begin();
1015
1016         // The binary search above gives us the first row with
1017         // a y position >= the top of the paint rect. Thus, the previous
1018         // may need to be repainted as well.
1019         if (startrow == m_rowPos.size() || (startrow > 0 && (m_rowPos[startrow] >  before)))
1020           --startrow;
1021
1022         LayoutUnit after = (style()->isHorizontalWritingMode() ? localRepaintRect.maxY() : localRepaintRect.maxX()) + os;
1023         endrow = std::lower_bound(m_rowPos.begin(), m_rowPos.end(), after) - m_rowPos.begin();
1024         if (endrow == m_rowPos.size())
1025           --endrow;
1026
1027         if (!endrow && m_rowPos[0] - table()->outerBorderBefore() <= after)
1028             ++endrow;
1029     }
1030
1031     unsigned startcol = 0;
1032     unsigned endcol = totalCols;
1033     // FIXME: Implement RTL.
1034     if (!m_forceSlowPaintPathWithOverflowingCell && style()->isLeftToRightDirection()) {
1035         LayoutUnit start = (style()->isHorizontalWritingMode() ? localRepaintRect.x() : localRepaintRect.y()) - os;
1036         Vector<LayoutUnit>& columnPos = table()->columnPositions();
1037         startcol = std::lower_bound(columnPos.begin(), columnPos.end(), start) - columnPos.begin();
1038         if ((startcol == columnPos.size()) || (startcol > 0 && (columnPos[startcol] > start)))
1039             --startcol;
1040
1041         LayoutUnit end = (style()->isHorizontalWritingMode() ? localRepaintRect.maxX() : localRepaintRect.maxY()) + os;
1042         endcol = std::lower_bound(columnPos.begin(), columnPos.end(), end) - columnPos.begin();
1043         if (endcol == columnPos.size())
1044             --endcol;
1045
1046         if (!endcol && columnPos[0] - table()->outerBorderStart() <= end)
1047             ++endcol;
1048     }
1049     if (startcol < endcol) {
1050         if (!m_hasMultipleCellLevels && !m_overflowingCells.size()) {
1051             // Draw the dirty cells in the order that they appear.
1052             for (unsigned r = startrow; r < endrow; r++) {
1053                 for (unsigned c = startcol; c < endcol; c++) {
1054                     CellStruct& current = cellAt(r, c);
1055                     RenderTableCell* cell = current.primaryCell();
1056                     if (!cell || (r > startrow && primaryCellAt(r - 1, c) == cell) || (c > startcol && primaryCellAt(r, c - 1) == cell))
1057                         continue;
1058                     paintCell(cell, paintInfo, paintOffset);
1059                 }
1060             }
1061         } else {
1062             // The overflowing cells should be scarce to avoid adding a lot of cells to the HashSet.
1063             ASSERT(m_overflowingCells.size() < totalRows * totalCols * gMaxAllowedOverflowingCellRatioForFastPaintPath);
1064
1065             // To make sure we properly repaint the section, we repaint all the overflowing cells that we collected.
1066             Vector<RenderTableCell*> cells;
1067             copyToVector(m_overflowingCells, cells);
1068
1069             HashSet<RenderTableCell*> spanningCells;
1070
1071             for (unsigned r = startrow; r < endrow; r++) {
1072                 for (unsigned c = startcol; c < endcol; c++) {
1073                     CellStruct& current = cellAt(r, c);
1074                     if (!current.hasCells())
1075                         continue;
1076                     for (unsigned i = 0; i < current.cells.size(); ++i) {
1077                         if (m_overflowingCells.contains(current.cells[i]))
1078                             continue;
1079
1080                         if (current.cells[i]->rowSpan() > 1 || current.cells[i]->colSpan() > 1) {
1081                             if (spanningCells.contains(current.cells[i]))
1082                                 continue;
1083                             spanningCells.add(current.cells[i]);
1084                         }
1085
1086                         cells.append(current.cells[i]);
1087                     }
1088                 }
1089             }
1090
1091             // Sort the dirty cells by paint order.
1092             if (!m_overflowingCells.size())
1093                 std::stable_sort(cells.begin(), cells.end(), compareCellPositions);
1094             else
1095                 std::sort(cells.begin(), cells.end(), compareCellPositionsWithOverflowingCells);
1096
1097             int size = cells.size();
1098             // Paint the cells.
1099             for (int i = 0; i < size; ++i)
1100                 paintCell(cells[i], paintInfo, paintOffset);
1101         }
1102     }
1103 }
1104
1105 void RenderTableSection::imageChanged(WrappedImagePtr, const IntRect*)
1106 {
1107     // FIXME: Examine cells and repaint only the rect the image paints in.
1108     repaint();
1109 }
1110
1111 void RenderTableSection::recalcCells()
1112 {
1113     m_cCol = 0;
1114     m_cRow = -1;
1115     clearGrid();
1116     m_gridRows = 0;
1117
1118     for (RenderObject* row = firstChild(); row; row = row->nextSibling()) {
1119         if (row->isTableRow()) {
1120             m_cRow++;
1121             m_cCol = 0;
1122             if (!ensureRows(m_cRow + 1))
1123                 break;
1124
1125             RenderTableRow* tableRow = toRenderTableRow(row);
1126             m_grid[m_cRow].rowRenderer = tableRow;
1127             setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(&m_grid[m_cRow]);
1128
1129             for (RenderObject* cell = row->firstChild(); cell; cell = cell->nextSibling()) {
1130                 if (cell->isTableCell())
1131                     addCell(toRenderTableCell(cell), tableRow);
1132             }
1133         }
1134     }
1135     m_needsCellRecalc = false;
1136     setNeedsLayout(true);
1137 }
1138
1139 void RenderTableSection::setNeedsCellRecalc()
1140 {
1141     m_needsCellRecalc = true;
1142     if (RenderTable* t = table())
1143         t->setNeedsSectionRecalc();
1144 }
1145
1146 void RenderTableSection::clearGrid()
1147 {
1148     int rows = m_gridRows;
1149     while (rows--)
1150         delete m_grid[rows].row;
1151 }
1152
1153 int RenderTableSection::numColumns() const
1154 {
1155     int result = 0;
1156
1157     for (int r = 0; r < m_gridRows; ++r) {
1158         for (int c = result; c < table()->numEffCols(); ++c) {
1159             const CellStruct& cell = cellAt(r, c);
1160             if (cell.hasCells() || cell.inColSpan)
1161                 result = c;
1162         }
1163     }
1164
1165     return result + 1;
1166 }
1167
1168 void RenderTableSection::appendColumn(int pos)
1169 {
1170     for (int row = 0; row < m_gridRows; ++row)
1171         m_grid[row].row->resize(pos + 1);
1172 }
1173
1174 void RenderTableSection::splitColumn(int pos, int first)
1175 {
1176     if (m_cCol > pos)
1177         m_cCol++;
1178     for (int row = 0; row < m_gridRows; ++row) {
1179         Row& r = *m_grid[row].row;
1180         r.insert(pos + 1, CellStruct());
1181         if (r[pos].hasCells()) {
1182             r[pos + 1].cells.append(r[pos].cells);
1183             RenderTableCell* cell = r[pos].primaryCell();
1184             ASSERT(cell);
1185             int colleft = cell->colSpan() - r[pos].inColSpan;
1186             if (first > colleft)
1187               r[pos + 1].inColSpan = 0;
1188             else
1189               r[pos + 1].inColSpan = first + r[pos].inColSpan;
1190         } else {
1191             r[pos + 1].inColSpan = 0;
1192         }
1193     }
1194 }
1195
1196 // Hit Testing
1197 bool RenderTableSection::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
1198 {
1199     // If we have no children then we have nothing to do.
1200     if (!firstChild())
1201         return false;
1202
1203     // Table sections cannot ever be hit tested.  Effectively they do not exist.
1204     // Just forward to our children always.
1205     LayoutPoint adjustedLocation = accumulatedOffset + location();
1206
1207     if (hasOverflowClip() && !overflowClipRect(adjustedLocation).intersects(result.rectForPoint(pointInContainer)))
1208         return false;
1209
1210     if (hasOverflowingCell()) {
1211         for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
1212             // FIXME: We have to skip over inline flows, since they can show up inside table rows
1213             // at the moment (a demoted inline <form> for example). If we ever implement a
1214             // table-specific hit-test method (which we should do for performance reasons anyway),
1215             // then we can remove this check.
1216             if (child->isBox() && !toRenderBox(child)->hasSelfPaintingLayer()) {
1217                 LayoutPoint childPoint = flipForWritingMode(toRenderBox(child), adjustedLocation, ParentToChildFlippingAdjustment);
1218                 if (child->nodeAtPoint(request, result, pointInContainer, childPoint, action)) {
1219                     updateHitTestResult(result, toLayoutPoint(pointInContainer - childPoint));
1220                     return true;
1221                 }
1222             }
1223         }
1224         return false;
1225     }
1226
1227     LayoutPoint location = pointInContainer - toLayoutSize(adjustedLocation);
1228     if (style()->isFlippedBlocksWritingMode()) {
1229         if (style()->isHorizontalWritingMode())
1230             location.setY(height() - location.y());
1231         else
1232             location.setX(width() - location.x());
1233     }
1234
1235     LayoutUnit offsetInColumnDirection = style()->isHorizontalWritingMode() ? location.y() : location.x();
1236     // Find the first row that starts after offsetInColumnDirection.
1237     unsigned nextRow = std::upper_bound(m_rowPos.begin(), m_rowPos.end(), offsetInColumnDirection) - m_rowPos.begin();
1238     if (nextRow == m_rowPos.size())
1239         return false;
1240     // Now set hitRow to the index of the hit row, or 0.
1241     unsigned hitRow = nextRow > 0 ? nextRow - 1 : 0;
1242
1243     Vector<LayoutUnit>& columnPos = table()->columnPositions();
1244     LayoutUnit offsetInRowDirection = style()->isHorizontalWritingMode() ? location.x() : location.y();
1245     if (!style()->isLeftToRightDirection())
1246         offsetInRowDirection = columnPos[columnPos.size() - 1] - offsetInRowDirection;
1247
1248     unsigned nextColumn = std::lower_bound(columnPos.begin(), columnPos.end(), offsetInRowDirection) - columnPos.begin();
1249     if (nextColumn == columnPos.size())
1250         return false;
1251     unsigned hitColumn = nextColumn > 0 ? nextColumn - 1 : 0;
1252
1253     CellStruct& current = cellAt(hitRow, hitColumn);
1254
1255     // If the cell is empty, there's nothing to do
1256     if (!current.hasCells())
1257         return false;
1258
1259     for (int i = current.cells.size() - 1; i >= 0; --i) {
1260         RenderTableCell* cell = current.cells[i];
1261         LayoutPoint cellPoint = flipForWritingMode(cell, adjustedLocation, ParentToChildFlippingAdjustment);
1262         if (static_cast<RenderObject*>(cell)->nodeAtPoint(request, result, pointInContainer, cellPoint, action)) {
1263             updateHitTestResult(result, toLayoutPoint(pointInContainer - cellPoint));
1264             return true;
1265         }
1266     }
1267     return false;
1268
1269 }
1270
1271 } // namespace WebCore