Unreviewed, rolling out r150023.
[WebKit-https.git] / 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 "Document.h"
29 #include "HitTestResult.h"
30 #include "HTMLNames.h"
31 #include "PaintInfo.h"
32 #include "RenderTableCell.h"
33 #include "RenderTableCol.h"
34 #include "RenderTableRow.h"
35 #include "RenderView.h"
36 #include "StyleInheritedData.h"
37 #include <limits>
38 #include <wtf/HashSet.h>
39 #include <wtf/StackStats.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.rowRenderer);
54     row.logicalHeight = row.rowRenderer->style()->logicalHeight();
55     if (row.logicalHeight.isRelative())
56         row.logicalHeight = Length();
57 }
58
59 static inline void updateLogicalHeightForCell(RenderTableSection::RowStruct& row, const RenderTableCell* cell)
60 {
61     // We ignore height settings on rowspan cells.
62     if (cell->rowSpan() != 1)
63         return;
64
65     Length logicalHeight = cell->style()->logicalHeight();
66     if (logicalHeight.isPositive() || (logicalHeight.isRelative() && logicalHeight.value() >= 0)) {
67         Length cRowLogicalHeight = row.logicalHeight;
68         switch (logicalHeight.type()) {
69         case Percent:
70             if (!(cRowLogicalHeight.isPercent())
71                 || (cRowLogicalHeight.isPercent() && cRowLogicalHeight.percent() < logicalHeight.percent()))
72                 row.logicalHeight = logicalHeight;
73             break;
74         case Fixed:
75             if (cRowLogicalHeight.type() < Percent
76                 || (cRowLogicalHeight.isFixed() && cRowLogicalHeight.value() < logicalHeight.value()))
77                 row.logicalHeight = logicalHeight;
78             break;
79         case Relative:
80         default:
81             break;
82         }
83     }
84 }
85
86
87 RenderTableSection::RenderTableSection(Element* element)
88     : RenderBox(element)
89     , m_cCol(0)
90     , m_cRow(0)
91     , m_outerBorderStart(0)
92     , m_outerBorderEnd(0)
93     , m_outerBorderBefore(0)
94     , m_outerBorderAfter(0)
95     , m_needsCellRecalc(false)
96     , m_hasMultipleCellLevels(false)
97 {
98     // init RenderObject attributes
99     setInline(false); // our object is not Inline
100 }
101
102 RenderTableSection::~RenderTableSection()
103 {
104 }
105
106 void RenderTableSection::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
107 {
108     RenderBox::styleDidChange(diff, oldStyle);
109     propagateStyleToAnonymousChildren();
110
111     // If border was changed, notify table.
112     RenderTable* table = this->table();
113     if (table && !table->selfNeedsLayout() && !table->normalChildNeedsLayout() && oldStyle && oldStyle->border() != style()->border())
114         table->invalidateCollapsedBorders();
115 }
116
117 void RenderTableSection::willBeRemovedFromTree()
118 {
119     RenderBox::willBeRemovedFromTree();
120
121     // Preventively invalidate our cells as we may be re-inserted into
122     // a new table which would require us to rebuild our structure.
123     setNeedsCellRecalc();
124 }
125
126 void RenderTableSection::addChild(RenderObject* child, RenderObject* beforeChild)
127 {
128     if (!child->isTableRow()) {
129         RenderObject* last = beforeChild;
130         if (!last)
131             last = lastChild();
132         if (last && last->isAnonymous() && !last->isBeforeOrAfterContent()) {
133             if (beforeChild == last)
134                 beforeChild = last->firstChild();
135             last->addChild(child, beforeChild);
136             return;
137         }
138
139         if (beforeChild && !beforeChild->isAnonymous() && beforeChild->parent() == this) {
140             RenderObject* row = beforeChild->previousSibling();
141             if (row && row->isTableRow() && row->isAnonymous()) {
142                 row->addChild(child);
143                 return;
144             }
145         }
146
147         // If beforeChild is inside an anonymous cell/row, insert into the cell or into
148         // the anonymous row containing it, if there is one.
149         RenderObject* lastBox = last;
150         while (lastBox && lastBox->parent()->isAnonymous() && !lastBox->isTableRow())
151             lastBox = lastBox->parent();
152         if (lastBox && lastBox->isAnonymous() && !lastBox->isBeforeOrAfterContent()) {
153             lastBox->addChild(child, beforeChild);
154             return;
155         }
156
157         RenderObject* row = RenderTableRow::createAnonymousWithParentRenderer(this);
158         addChild(row, beforeChild);
159         row->addChild(child);
160         return;
161     }
162
163     if (beforeChild)
164         setNeedsCellRecalc();
165
166     unsigned insertionRow = m_cRow;
167     ++m_cRow;
168     m_cCol = 0;
169
170     ensureRows(m_cRow);
171
172     RenderTableRow* row = toRenderTableRow(child);
173     m_grid[insertionRow].rowRenderer = row;
174     row->setRowIndex(insertionRow);
175
176     if (!beforeChild)
177         setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(m_grid[insertionRow]);
178
179     if (beforeChild && beforeChild->parent() != this)
180         beforeChild = splitAnonymousBoxesAroundChild(beforeChild);
181
182     ASSERT(!beforeChild || beforeChild->isTableRow());
183     RenderBox::addChild(child, beforeChild);
184 }
185
186 void RenderTableSection::ensureRows(unsigned numRows)
187 {
188     if (numRows <= m_grid.size())
189         return;
190
191     unsigned oldSize = m_grid.size();
192     m_grid.grow(numRows);
193
194     unsigned effectiveColumnCount = max(1u, table()->numEffCols());
195     for (unsigned row = oldSize; row < m_grid.size(); ++row)
196         m_grid[row].row.grow(effectiveColumnCount);
197 }
198
199 void RenderTableSection::addCell(RenderTableCell* cell, RenderTableRow* row)
200 {
201     // We don't insert the cell if we need cell recalc as our internal columns' representation
202     // will have drifted from the table's representation. Also recalcCells will call addCell
203     // at a later time after sync'ing our columns' with the table's.
204     if (needsCellRecalc())
205         return;
206
207     unsigned rSpan = cell->rowSpan();
208     unsigned cSpan = cell->colSpan();
209     const Vector<RenderTable::ColumnStruct>& columns = table()->columns();
210     unsigned nCols = columns.size();
211     unsigned insertionRow = row->rowIndex();
212
213     // ### mozilla still seems to do the old HTML way, even for strict DTD
214     // (see the annotation on table cell layouting in the CSS specs and the testcase below:
215     // <TABLE border>
216     // <TR><TD>1 <TD rowspan="2">2 <TD>3 <TD>4
217     // <TR><TD colspan="2">5
218     // </TABLE>
219     while (m_cCol < nCols && (cellAt(insertionRow, m_cCol).hasCells() || cellAt(insertionRow, m_cCol).inColSpan))
220         m_cCol++;
221
222     updateLogicalHeightForCell(m_grid[insertionRow], cell);
223
224     ensureRows(insertionRow + rSpan);
225
226     m_grid[insertionRow].rowRenderer = row;
227
228     unsigned col = m_cCol;
229     // tell the cell where it is
230     bool inColSpan = false;
231     while (cSpan) {
232         unsigned currentSpan;
233         if (m_cCol >= nCols) {
234             table()->appendColumn(cSpan);
235             currentSpan = cSpan;
236         } else {
237             if (cSpan < columns[m_cCol].span)
238                 table()->splitColumn(m_cCol, cSpan);
239             currentSpan = columns[m_cCol].span;
240         }
241         for (unsigned r = 0; r < rSpan; r++) {
242             CellStruct& c = cellAt(insertionRow + r, m_cCol);
243             ASSERT(cell);
244             c.cells.append(cell);
245             // If cells overlap then we take the slow path for painting.
246             if (c.cells.size() > 1)
247                 m_hasMultipleCellLevels = true;
248             if (inColSpan)
249                 c.inColSpan = true;
250         }
251         m_cCol++;
252         cSpan -= currentSpan;
253         inColSpan = true;
254     }
255     cell->setCol(table()->effColToCol(col));
256 }
257
258 int RenderTableSection::calcRowLogicalHeight()
259 {
260 #ifndef NDEBUG
261     SetLayoutNeededForbiddenScope layoutForbiddenScope(this);
262 #endif
263
264     ASSERT(!needsLayout());
265
266     RenderTableCell* cell;
267
268     int spacing = table()->vBorderSpacing();
269     
270     RenderView* viewRenderer = view();
271     LayoutStateMaintainer statePusher(viewRenderer);
272
273     m_rowPos.resize(m_grid.size() + 1);
274     m_rowPos[0] = spacing;
275
276     unsigned totalRows = m_grid.size();
277
278     for (unsigned r = 0; r < totalRows; r++) {
279         m_grid[r].baseline = 0;
280         LayoutUnit baselineDescent = 0;
281
282         // Our base size is the biggest logical height from our cells' styles (excluding row spanning cells).
283         m_rowPos[r + 1] = max(m_rowPos[r] + minimumValueForLength(m_grid[r].logicalHeight, 0, viewRenderer).round(), 0);
284
285         Row& row = m_grid[r].row;
286         unsigned totalCols = row.size();
287
288         for (unsigned c = 0; c < totalCols; c++) {
289             CellStruct& current = cellAt(r, c);
290             for (unsigned i = 0; i < current.cells.size(); i++) {
291                 cell = current.cells[i];
292                 if (current.inColSpan && cell->rowSpan() == 1)
293                     continue;
294
295                 // FIXME: We are always adding the height of a rowspan to the last rows which doesn't match
296                 // other browsers. See webkit.org/b/52185 for example.
297                 if ((cell->rowIndex() + cell->rowSpan() - 1) != r) {
298                     // We will apply the height of the rowspan to the current row if next row is not valid.
299                     if ((r + 1) < totalRows) {
300                         unsigned col = 0;
301                         CellStruct nextRowCell = cellAt(r + 1, col);
302
303                         // We are trying to find that next row is valid or not.
304                         while (nextRowCell.cells.size() && nextRowCell.cells[0]->rowSpan() > 1 && nextRowCell.cells[0]->rowIndex() < (r + 1)) {
305                             col++;
306                             if (col < totalCols)
307                                 nextRowCell = cellAt(r + 1, col);
308                             else
309                                 break;
310                         }
311
312                         // We are adding the height of the rowspan to the current row if next row is not valid.
313                         if (col < totalCols && nextRowCell.cells.size())
314                             continue;
315                     }
316                 }
317
318                 // For row spanning cells, |r| is the last row in the span.
319                 unsigned cellStartRow = cell->rowIndex();
320
321                 if (cell->hasOverrideHeight()) {
322                     if (!statePusher.didPush()) {
323                         // Technically, we should also push state for the row, but since
324                         // rows don't push a coordinate transform, that's not necessary.
325                         statePusher.push(this, locationOffset());
326                     }
327                     cell->clearIntrinsicPadding();
328                     cell->clearOverrideSize();
329                     cell->setChildNeedsLayout(true, MarkOnlyThis);
330                     cell->layoutIfNeeded();
331                 }
332
333                 int cellLogicalHeight = cell->logicalHeightForRowSizing();
334                 m_rowPos[r + 1] = max(m_rowPos[r + 1], m_rowPos[cellStartRow] + cellLogicalHeight);
335
336                 // Find out the baseline. The baseline is set on the first row in a rowspan.
337                 if (cell->isBaselineAligned()) {
338                     LayoutUnit baselinePosition = cell->cellBaselinePosition();
339                     if (baselinePosition > cell->borderBefore() + cell->paddingBefore()) {
340                         m_grid[cellStartRow].baseline = max(m_grid[cellStartRow].baseline, baselinePosition);
341                         // The descent of a cell that spans multiple rows does not affect the height of the first row it spans, so don't let it
342                         // become the baseline descent applied to the rest of the row. Also we don't account for the baseline descent of
343                         // non-spanning cells when computing a spanning cell's extent.
344                         int cellStartRowBaselineDescent = 0;
345                         if (cell->rowSpan() == 1) {
346                             baselineDescent = max(baselineDescent, cellLogicalHeight - (baselinePosition - cell->intrinsicPaddingBefore()));
347                             cellStartRowBaselineDescent = baselineDescent;
348                         }
349                         m_rowPos[cellStartRow + 1] = max<int>(m_rowPos[cellStartRow + 1], m_rowPos[cellStartRow] + m_grid[cellStartRow].baseline + cellStartRowBaselineDescent);
350                     }
351                 }
352             }
353         }
354
355         // Add the border-spacing to our final position.
356         m_rowPos[r + 1] += m_grid[r].rowRenderer ? spacing : 0;
357         m_rowPos[r + 1] = max(m_rowPos[r + 1], m_rowPos[r]);
358     }
359
360     ASSERT(!needsLayout());
361
362     statePusher.pop();
363
364     return m_rowPos[m_grid.size()];
365 }
366
367 void RenderTableSection::layout()
368 {
369     StackStats::LayoutCheckPoint layoutCheckPoint;
370     ASSERT(needsLayout());
371     ASSERT(!needsCellRecalc());
372     ASSERT(!table()->needsSectionRecalc());
373
374     // addChild may over-grow m_grid but we don't want to throw away the memory too early as addChild
375     // can be called in a loop (e.g during parsing). Doing it now ensures we have a stable-enough structure.
376     m_grid.shrinkToFit();
377
378     LayoutStateMaintainer statePusher(view(), this, locationOffset(), hasTransform() || hasReflection() || style()->isFlippedBlocksWritingMode());
379
380     const Vector<int>& columnPos = table()->columnPositions();
381
382     for (unsigned r = 0; r < m_grid.size(); ++r) {
383         Row& row = m_grid[r].row;
384         unsigned cols = row.size();
385         // First, propagate our table layout's information to the cells. This will mark the row as needing layout
386         // if there was a column logical width change.
387         for (unsigned startColumn = 0; startColumn < cols; ++startColumn) {
388             CellStruct& current = row[startColumn];
389             RenderTableCell* cell = current.primaryCell();
390             if (!cell || current.inColSpan)
391                 continue;
392
393             unsigned endCol = startColumn;
394             unsigned cspan = cell->colSpan();
395             while (cspan && endCol < cols) {
396                 ASSERT(endCol < table()->columns().size());
397                 cspan -= table()->columns()[endCol].span;
398                 endCol++;
399             }
400             int tableLayoutLogicalWidth = columnPos[endCol] - columnPos[startColumn] - table()->hBorderSpacing();
401             cell->setCellLogicalWidth(tableLayoutLogicalWidth);
402         }
403
404         if (RenderTableRow* rowRenderer = m_grid[r].rowRenderer)
405             rowRenderer->layoutIfNeeded();
406     }
407
408     statePusher.pop();
409     setNeedsLayout(false);
410 }
411
412 void RenderTableSection::distributeExtraLogicalHeightToPercentRows(int& extraLogicalHeight, int totalPercent)
413 {
414     if (!totalPercent)
415         return;
416
417     unsigned totalRows = m_grid.size();
418     int totalHeight = m_rowPos[totalRows] + extraLogicalHeight;
419     int totalLogicalHeightAdded = 0;
420     totalPercent = min(totalPercent, 100);
421     int rowHeight = m_rowPos[1] - m_rowPos[0];
422     for (unsigned r = 0; r < totalRows; ++r) {
423         if (totalPercent > 0 && m_grid[r].logicalHeight.isPercent()) {
424             int toAdd = min<int>(extraLogicalHeight, (totalHeight * m_grid[r].logicalHeight.percent() / 100) - rowHeight);
425             // If toAdd is negative, then we don't want to shrink the row (this bug
426             // affected Outlook Web Access).
427             toAdd = max(0, toAdd);
428             totalLogicalHeightAdded += toAdd;
429             extraLogicalHeight -= toAdd;
430             totalPercent -= m_grid[r].logicalHeight.percent();
431         }
432         ASSERT(totalRows >= 1);
433         if (r < totalRows - 1)
434             rowHeight = m_rowPos[r + 2] - m_rowPos[r + 1];
435         m_rowPos[r + 1] += totalLogicalHeightAdded;
436     }
437 }
438
439 void RenderTableSection::distributeExtraLogicalHeightToAutoRows(int& extraLogicalHeight, unsigned autoRowsCount)
440 {
441     if (!autoRowsCount)
442         return;
443
444     int totalLogicalHeightAdded = 0;
445     for (unsigned r = 0; r < m_grid.size(); ++r) {
446         if (autoRowsCount > 0 && m_grid[r].logicalHeight.isAuto()) {
447             // Recomputing |extraLogicalHeightForRow| guarantees that we properly ditribute round |extraLogicalHeight|.
448             int extraLogicalHeightForRow = extraLogicalHeight / autoRowsCount;
449             totalLogicalHeightAdded += extraLogicalHeightForRow;
450             extraLogicalHeight -= extraLogicalHeightForRow;
451             --autoRowsCount;
452         }
453         m_rowPos[r + 1] += totalLogicalHeightAdded;
454     }
455 }
456
457 void RenderTableSection::distributeRemainingExtraLogicalHeight(int& extraLogicalHeight)
458 {
459     unsigned totalRows = m_grid.size();
460
461     if (extraLogicalHeight <= 0 || !m_rowPos[totalRows])
462         return;
463
464     // FIXME: m_rowPos[totalRows] - m_rowPos[0] is the total rows' size.
465     int totalRowSize = m_rowPos[totalRows];
466     int totalLogicalHeightAdded = 0;
467     int previousRowPosition = m_rowPos[0];
468     for (unsigned r = 0; r < totalRows; r++) {
469         // weight with the original height
470         totalLogicalHeightAdded += extraLogicalHeight * (m_rowPos[r + 1] - previousRowPosition) / totalRowSize;
471         previousRowPosition = m_rowPos[r + 1];
472         m_rowPos[r + 1] += totalLogicalHeightAdded;
473     }
474
475     extraLogicalHeight -= totalLogicalHeightAdded;
476 }
477
478 int RenderTableSection::distributeExtraLogicalHeightToRows(int extraLogicalHeight)
479 {
480     if (!extraLogicalHeight)
481         return extraLogicalHeight;
482
483     unsigned totalRows = m_grid.size();
484     if (!totalRows)
485         return extraLogicalHeight;
486
487     if (!m_rowPos[totalRows] && nextSibling())
488         return extraLogicalHeight;
489
490     unsigned autoRowsCount = 0;
491     int totalPercent = 0;
492     for (unsigned r = 0; r < totalRows; r++) {
493         if (m_grid[r].logicalHeight.isAuto())
494             ++autoRowsCount;
495         else if (m_grid[r].logicalHeight.isPercent())
496             totalPercent += m_grid[r].logicalHeight.percent();
497     }
498
499     int remainingExtraLogicalHeight = extraLogicalHeight;
500     distributeExtraLogicalHeightToPercentRows(remainingExtraLogicalHeight, totalPercent);
501     distributeExtraLogicalHeightToAutoRows(remainingExtraLogicalHeight, autoRowsCount);
502     distributeRemainingExtraLogicalHeight(remainingExtraLogicalHeight);
503     return extraLogicalHeight - remainingExtraLogicalHeight;
504 }
505
506 void RenderTableSection::layoutRows()
507 {
508 #ifndef NDEBUG
509     SetLayoutNeededForbiddenScope layoutForbiddenScope(this);
510 #endif
511
512     ASSERT(!needsLayout());
513
514     unsigned totalRows = m_grid.size();
515
516     // Set the width of our section now.  The rows will also be this width.
517     setLogicalWidth(table()->contentLogicalWidth());
518     m_overflow.clear();
519     m_overflowingCells.clear();
520     m_forceSlowPaintPathWithOverflowingCell = false;
521
522     int vspacing = table()->vBorderSpacing();
523     unsigned nEffCols = table()->numEffCols();
524
525     LayoutStateMaintainer statePusher(view(), this, locationOffset(), hasTransform() || style()->isFlippedBlocksWritingMode());
526
527     for (unsigned r = 0; r < totalRows; r++) {
528         // Set the row's x/y position and width/height.
529         if (RenderTableRow* rowRenderer = m_grid[r].rowRenderer) {
530             rowRenderer->setLocation(LayoutPoint(0, m_rowPos[r]));
531             rowRenderer->setLogicalWidth(logicalWidth());
532             rowRenderer->setLogicalHeight(m_rowPos[r + 1] - m_rowPos[r] - vspacing);
533             rowRenderer->updateLayerTransform();
534         }
535
536         int rowHeightIncreaseForPagination = 0;
537
538         for (unsigned c = 0; c < nEffCols; c++) {
539             CellStruct& cs = cellAt(r, c);
540             RenderTableCell* cell = cs.primaryCell();
541
542             if (!cell || cs.inColSpan)
543                 continue;
544
545             int rowIndex = cell->rowIndex();
546             int rHeight = m_rowPos[rowIndex + cell->rowSpan()] - m_rowPos[rowIndex] - vspacing;
547
548             // Force percent height children to lay themselves out again.
549             // This will cause these children to grow to fill the cell.
550             // FIXME: There is still more work to do here to fully match WinIE (should
551             // it become necessary to do so).  In quirks mode, WinIE behaves like we
552             // do, but it will clip the cells that spill out of the table section.  In
553             // strict mode, Mozilla and WinIE both regrow the table to accommodate the
554             // new height of the cell (thus letting the percentages cause growth one
555             // time only).  We may also not be handling row-spanning cells correctly.
556             //
557             // Note also the oddity where replaced elements always flex, and yet blocks/tables do
558             // not necessarily flex.  WinIE is crazy and inconsistent, and we can't hope to
559             // match the behavior perfectly, but we'll continue to refine it as we discover new
560             // bugs. :)
561             bool cellChildrenFlex = false;
562             bool flexAllChildren = cell->style()->logicalHeight().isFixed()
563                 || (!table()->style()->logicalHeight().isAuto() && rHeight != cell->logicalHeight());
564
565             for (RenderObject* o = cell->firstChild(); o; o = o->nextSibling()) {
566                 if (!o->isText() && o->style()->logicalHeight().isPercent() && (flexAllChildren || ((o->isReplaced() || (o->isBox() && toRenderBox(o)->scrollsOverflow())) && !o->isTextControl()))) {
567                     // Tables with no sections do not flex.
568                     if (!o->isTable() || toRenderTable(o)->hasSections()) {
569                         o->setNeedsLayout(true, MarkOnlyThis);
570                         cellChildrenFlex = true;
571                     }
572                 }
573             }
574
575             if (TrackedRendererListHashSet* percentHeightDescendants = cell->percentHeightDescendants()) {
576                 TrackedRendererListHashSet::iterator end = percentHeightDescendants->end();
577                 for (TrackedRendererListHashSet::iterator it = percentHeightDescendants->begin(); it != end; ++it) {
578                     RenderBox* box = *it;
579                     if (!box->isReplaced() && !box->scrollsOverflow() && !flexAllChildren)
580                         continue;
581
582                     while (box != cell) {
583                         if (box->normalChildNeedsLayout())
584                             break;
585                         box->setChildNeedsLayout(true, MarkOnlyThis);
586                         box = box->containingBlock();
587                         ASSERT(box);
588                         if (!box)
589                             break;
590                     }
591                     cellChildrenFlex = true;
592                 }
593             }
594
595             if (cellChildrenFlex) {
596                 cell->setChildNeedsLayout(true, MarkOnlyThis);
597                 // Alignment within a cell is based off the calculated
598                 // height, which becomes irrelevant once the cell has
599                 // been resized based off its percentage.
600                 cell->setOverrideLogicalContentHeightFromRowHeight(rHeight);
601                 cell->layoutIfNeeded();
602
603                 // If the baseline moved, we may have to update the data for our row. Find out the new baseline.
604                 if (cell->isBaselineAligned()) {
605                     LayoutUnit baseline = cell->cellBaselinePosition();
606                     if (baseline > cell->borderBefore() + cell->paddingBefore())
607                         m_grid[r].baseline = max(m_grid[r].baseline, baseline);
608                 }
609             }
610
611             cell->computeIntrinsicPadding(rHeight);
612
613             LayoutRect oldCellRect = cell->frameRect();
614
615             setLogicalPositionForCell(cell, c);
616
617             if (!cell->needsLayout() && view()->layoutState()->pageLogicalHeight() && view()->layoutState()->pageLogicalOffset(cell, cell->logicalTop()) != cell->pageLogicalOffset())
618                 cell->setChildNeedsLayout(true, MarkOnlyThis);
619
620             cell->layoutIfNeeded();
621
622             // FIXME: Make pagination work with vertical tables.
623             if (view()->layoutState()->pageLogicalHeight() && cell->logicalHeight() != rHeight) {
624                 // FIXME: Pagination might have made us change size. For now just shrink or grow the cell to fit without doing a relayout.
625                 // We'll also do a basic increase of the row height to accommodate the cell if it's bigger, but this isn't quite right
626                 // either. It's at least stable though and won't result in an infinite # of relayouts that may never stabilize.
627                 if (cell->logicalHeight() > rHeight)
628                     rowHeightIncreaseForPagination = max<int>(rowHeightIncreaseForPagination, cell->logicalHeight() - rHeight);
629                 cell->setLogicalHeight(rHeight);
630             }
631
632             LayoutSize childOffset(cell->location() - oldCellRect.location());
633             if (childOffset.width() || childOffset.height()) {
634                 view()->addLayoutDelta(childOffset);
635
636                 // If the child moved, we have to repaint it as well as any floating/positioned
637                 // descendants.  An exception is if we need a layout.  In this case, we know we're going to
638                 // repaint ourselves (and the child) anyway.
639                 if (!table()->selfNeedsLayout() && cell->checkForRepaintDuringLayout())
640                     cell->repaintDuringLayoutIfMoved(oldCellRect);
641             }
642         }
643         if (rowHeightIncreaseForPagination) {
644             for (unsigned rowIndex = r + 1; rowIndex <= totalRows; rowIndex++)
645                 m_rowPos[rowIndex] += rowHeightIncreaseForPagination;
646             for (unsigned c = 0; c < nEffCols; ++c) {
647                 Vector<RenderTableCell*, 1>& cells = cellAt(r, c).cells;
648                 for (size_t i = 0; i < cells.size(); ++i)
649                     cells[i]->setLogicalHeight(cells[i]->logicalHeight() + rowHeightIncreaseForPagination);
650             }
651         }
652     }
653
654     ASSERT(!needsLayout());
655
656     setLogicalHeight(m_rowPos[totalRows]);
657
658     computeOverflowFromCells(totalRows, nEffCols);
659
660     statePusher.pop();
661 }
662
663 void RenderTableSection::computeOverflowFromCells()
664 {
665     unsigned totalRows = m_grid.size();
666     unsigned nEffCols = table()->numEffCols();
667     computeOverflowFromCells(totalRows, nEffCols);
668 }
669
670 void RenderTableSection::computeOverflowFromCells(unsigned totalRows, unsigned nEffCols)
671 {
672     unsigned totalCellsCount = nEffCols * totalRows;
673     int maxAllowedOverflowingCellsCount = totalCellsCount < gMinTableSizeToUseFastPaintPathWithOverflowingCell ? 0 : gMaxAllowedOverflowingCellRatioForFastPaintPath * totalCellsCount;
674
675 #ifndef NDEBUG
676     bool hasOverflowingCell = false;
677 #endif
678     // Now that our height has been determined, add in overflow from cells.
679     for (unsigned r = 0; r < totalRows; r++) {
680         for (unsigned c = 0; c < nEffCols; c++) {
681             CellStruct& cs = cellAt(r, c);
682             RenderTableCell* cell = cs.primaryCell();
683             if (!cell || cs.inColSpan)
684                 continue;
685             if (r < totalRows - 1 && cell == primaryCellAt(r + 1, c))
686                 continue;
687             addOverflowFromChild(cell);
688 #ifndef NDEBUG
689             hasOverflowingCell |= cell->hasVisualOverflow();
690 #endif
691             if (cell->hasVisualOverflow() && !m_forceSlowPaintPathWithOverflowingCell) {
692                 m_overflowingCells.add(cell);
693                 if (m_overflowingCells.size() > maxAllowedOverflowingCellsCount) {
694                     // We need to set m_forcesSlowPaintPath only if there is a least one overflowing cells as the hit testing code rely on this information.
695                     m_forceSlowPaintPathWithOverflowingCell = true;
696                     // The slow path does not make any use of the overflowing cells info, don't hold on to the memory.
697                     m_overflowingCells.clear();
698                 }
699             }
700         }
701     }
702
703     ASSERT(hasOverflowingCell == this->hasOverflowingCell());
704 }
705
706 int RenderTableSection::calcOuterBorderBefore() const
707 {
708     unsigned totalCols = table()->numEffCols();
709     if (!m_grid.size() || !totalCols)
710         return 0;
711
712     unsigned borderWidth = 0;
713
714     const BorderValue& sb = style()->borderBefore();
715     if (sb.style() == BHIDDEN)
716         return -1;
717     if (sb.style() > BHIDDEN)
718         borderWidth = sb.width();
719
720     const BorderValue& rb = firstChild()->style()->borderBefore();
721     if (rb.style() == BHIDDEN)
722         return -1;
723     if (rb.style() > BHIDDEN && rb.width() > borderWidth)
724         borderWidth = rb.width();
725
726     bool allHidden = true;
727     for (unsigned c = 0; c < totalCols; c++) {
728         const CellStruct& current = cellAt(0, c);
729         if (current.inColSpan || !current.hasCells())
730             continue;
731         const BorderValue& cb = current.primaryCell()->style()->borderBefore(); // FIXME: Make this work with perpendicular and flipped cells.
732         // FIXME: Don't repeat for the same col group
733         RenderTableCol* colGroup = table()->colElement(c);
734         if (colGroup) {
735             const BorderValue& gb = colGroup->style()->borderBefore();
736             if (gb.style() == BHIDDEN || cb.style() == BHIDDEN)
737                 continue;
738             allHidden = false;
739             if (gb.style() > BHIDDEN && gb.width() > borderWidth)
740                 borderWidth = gb.width();
741             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
742                 borderWidth = cb.width();
743         } else {
744             if (cb.style() == BHIDDEN)
745                 continue;
746             allHidden = false;
747             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
748                 borderWidth = cb.width();
749         }
750     }
751     if (allHidden)
752         return -1;
753
754     return borderWidth / 2;
755 }
756
757 int RenderTableSection::calcOuterBorderAfter() const
758 {
759     unsigned totalCols = table()->numEffCols();
760     if (!m_grid.size() || !totalCols)
761         return 0;
762
763     unsigned borderWidth = 0;
764
765     const BorderValue& sb = style()->borderAfter();
766     if (sb.style() == BHIDDEN)
767         return -1;
768     if (sb.style() > BHIDDEN)
769         borderWidth = sb.width();
770
771     const BorderValue& rb = lastChild()->style()->borderAfter();
772     if (rb.style() == BHIDDEN)
773         return -1;
774     if (rb.style() > BHIDDEN && rb.width() > borderWidth)
775         borderWidth = rb.width();
776
777     bool allHidden = true;
778     for (unsigned c = 0; c < totalCols; c++) {
779         const CellStruct& current = cellAt(m_grid.size() - 1, c);
780         if (current.inColSpan || !current.hasCells())
781             continue;
782         const BorderValue& cb = current.primaryCell()->style()->borderAfter(); // FIXME: Make this work with perpendicular and flipped cells.
783         // FIXME: Don't repeat for the same col group
784         RenderTableCol* colGroup = table()->colElement(c);
785         if (colGroup) {
786             const BorderValue& gb = colGroup->style()->borderAfter();
787             if (gb.style() == BHIDDEN || cb.style() == BHIDDEN)
788                 continue;
789             allHidden = false;
790             if (gb.style() > BHIDDEN && gb.width() > borderWidth)
791                 borderWidth = gb.width();
792             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
793                 borderWidth = cb.width();
794         } else {
795             if (cb.style() == BHIDDEN)
796                 continue;
797             allHidden = false;
798             if (cb.style() > BHIDDEN && cb.width() > borderWidth)
799                 borderWidth = cb.width();
800         }
801     }
802     if (allHidden)
803         return -1;
804
805     return (borderWidth + 1) / 2;
806 }
807
808 int RenderTableSection::calcOuterBorderStart() const
809 {
810     unsigned totalCols = table()->numEffCols();
811     if (!m_grid.size() || !totalCols)
812         return 0;
813
814     unsigned borderWidth = 0;
815
816     const BorderValue& sb = style()->borderStart();
817     if (sb.style() == BHIDDEN)
818         return -1;
819     if (sb.style() > BHIDDEN)
820         borderWidth = sb.width();
821
822     if (RenderTableCol* colGroup = table()->colElement(0)) {
823         const BorderValue& gb = colGroup->style()->borderStart();
824         if (gb.style() == BHIDDEN)
825             return -1;
826         if (gb.style() > BHIDDEN && gb.width() > borderWidth)
827             borderWidth = gb.width();
828     }
829
830     bool allHidden = true;
831     for (unsigned r = 0; r < m_grid.size(); r++) {
832         const CellStruct& current = cellAt(r, 0);
833         if (!current.hasCells())
834             continue;
835         // FIXME: Don't repeat for the same cell
836         const BorderValue& cb = current.primaryCell()->style()->borderStart(); // FIXME: Make this work with perpendicular and flipped cells.
837         const BorderValue& rb = current.primaryCell()->parent()->style()->borderStart();
838         if (cb.style() == BHIDDEN || rb.style() == BHIDDEN)
839             continue;
840         allHidden = false;
841         if (cb.style() > BHIDDEN && cb.width() > borderWidth)
842             borderWidth = cb.width();
843         if (rb.style() > BHIDDEN && rb.width() > borderWidth)
844             borderWidth = rb.width();
845     }
846     if (allHidden)
847         return -1;
848
849     return (borderWidth + (table()->style()->isLeftToRightDirection() ? 0 : 1)) / 2;
850 }
851
852 int RenderTableSection::calcOuterBorderEnd() const
853 {
854     unsigned totalCols = table()->numEffCols();
855     if (!m_grid.size() || !totalCols)
856         return 0;
857
858     unsigned borderWidth = 0;
859
860     const BorderValue& sb = style()->borderEnd();
861     if (sb.style() == BHIDDEN)
862         return -1;
863     if (sb.style() > BHIDDEN)
864         borderWidth = sb.width();
865
866     if (RenderTableCol* colGroup = table()->colElement(totalCols - 1)) {
867         const BorderValue& gb = colGroup->style()->borderEnd();
868         if (gb.style() == BHIDDEN)
869             return -1;
870         if (gb.style() > BHIDDEN && gb.width() > borderWidth)
871             borderWidth = gb.width();
872     }
873
874     bool allHidden = true;
875     for (unsigned r = 0; r < m_grid.size(); r++) {
876         const CellStruct& current = cellAt(r, totalCols - 1);
877         if (!current.hasCells())
878             continue;
879         // FIXME: Don't repeat for the same cell
880         const BorderValue& cb = current.primaryCell()->style()->borderEnd(); // FIXME: Make this work with perpendicular and flipped cells.
881         const BorderValue& rb = current.primaryCell()->parent()->style()->borderEnd();
882         if (cb.style() == BHIDDEN || rb.style() == BHIDDEN)
883             continue;
884         allHidden = false;
885         if (cb.style() > BHIDDEN && cb.width() > borderWidth)
886             borderWidth = cb.width();
887         if (rb.style() > BHIDDEN && rb.width() > borderWidth)
888             borderWidth = rb.width();
889     }
890     if (allHidden)
891         return -1;
892
893     return (borderWidth + (table()->style()->isLeftToRightDirection() ? 1 : 0)) / 2;
894 }
895
896 void RenderTableSection::recalcOuterBorder()
897 {
898     m_outerBorderBefore = calcOuterBorderBefore();
899     m_outerBorderAfter = calcOuterBorderAfter();
900     m_outerBorderStart = calcOuterBorderStart();
901     m_outerBorderEnd = calcOuterBorderEnd();
902 }
903
904 int RenderTableSection::firstLineBoxBaseline() const
905 {
906     if (!m_grid.size())
907         return -1;
908
909     int firstLineBaseline = m_grid[0].baseline;
910     if (firstLineBaseline)
911         return firstLineBaseline + m_rowPos[0];
912
913     firstLineBaseline = -1;
914     const Row& firstRow = m_grid[0].row;
915     for (size_t i = 0; i < firstRow.size(); ++i) {
916         const CellStruct& cs = firstRow.at(i);
917         const RenderTableCell* cell = cs.primaryCell();
918         // Only cells with content have a baseline
919         if (cell && cell->contentLogicalHeight())
920             firstLineBaseline = max<int>(firstLineBaseline, cell->logicalTop() + cell->paddingBefore() + cell->borderBefore() + cell->contentLogicalHeight());
921     }
922
923     return firstLineBaseline;
924 }
925
926 void RenderTableSection::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
927 {
928     // put this back in when all layout tests can handle it
929     // ASSERT(!needsLayout());
930     // avoid crashing on bugs that cause us to paint with dirty layout
931     if (needsLayout())
932         return;
933     
934     unsigned totalRows = m_grid.size();
935     unsigned totalCols = table()->columns().size();
936
937     if (!totalRows || !totalCols)
938         return;
939
940     LayoutPoint adjustedPaintOffset = paintOffset + location();
941
942     PaintPhase phase = paintInfo.phase;
943     bool pushedClip = pushContentsClip(paintInfo, adjustedPaintOffset);
944     paintObject(paintInfo, adjustedPaintOffset);
945     if (pushedClip)
946         popContentsClip(paintInfo, phase, adjustedPaintOffset);
947
948     if ((phase == PaintPhaseOutline || phase == PaintPhaseSelfOutline) && style()->visibility() == VISIBLE)
949         paintOutline(paintInfo, LayoutRect(adjustedPaintOffset, size()));
950 }
951
952 static inline bool compareCellPositions(RenderTableCell* elem1, RenderTableCell* elem2)
953 {
954     return elem1->rowIndex() < elem2->rowIndex();
955 }
956
957 // This comparison is used only when we have overflowing cells as we have an unsorted array to sort. We thus need
958 // to sort both on rows and columns to properly repaint.
959 static inline bool compareCellPositionsWithOverflowingCells(RenderTableCell* elem1, RenderTableCell* elem2)
960 {
961     if (elem1->rowIndex() != elem2->rowIndex())
962         return elem1->rowIndex() < elem2->rowIndex();
963
964     return elem1->col() < elem2->col();
965 }
966
967 void RenderTableSection::paintCell(RenderTableCell* cell, PaintInfo& paintInfo, const LayoutPoint& paintOffset)
968 {
969     LayoutPoint cellPoint = flipForWritingModeForChild(cell, paintOffset);
970     PaintPhase paintPhase = paintInfo.phase;
971     RenderTableRow* row = toRenderTableRow(cell->parent());
972
973     if (paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) {
974         // We need to handle painting a stack of backgrounds.  This stack (from bottom to top) consists of
975         // the column group, column, row group, row, and then the cell.
976         RenderTableCol* column = table()->colElement(cell->col());
977         RenderTableCol* columnGroup = column ? column->enclosingColumnGroup() : 0;
978
979         // Column groups and columns first.
980         // FIXME: Columns and column groups do not currently support opacity, and they are being painted "too late" in
981         // the stack, since we have already opened a transparency layer (potentially) for the table row group.
982         // Note that we deliberately ignore whether or not the cell has a layer, since these backgrounds paint "behind" the
983         // cell.
984         cell->paintBackgroundsBehindCell(paintInfo, cellPoint, columnGroup);
985         cell->paintBackgroundsBehindCell(paintInfo, cellPoint, column);
986
987         // Paint the row group next.
988         cell->paintBackgroundsBehindCell(paintInfo, cellPoint, this);
989
990         // Paint the row next, but only if it doesn't have a layer.  If a row has a layer, it will be responsible for
991         // painting the row background for the cell.
992         if (!row->hasSelfPaintingLayer())
993             cell->paintBackgroundsBehindCell(paintInfo, cellPoint, row);
994     }
995     if ((!cell->hasSelfPaintingLayer() && !row->hasSelfPaintingLayer()))
996         cell->paint(paintInfo, cellPoint);
997 }
998
999 LayoutRect RenderTableSection::logicalRectForWritingModeAndDirection(const LayoutRect& rect) const
1000 {
1001     LayoutRect tableAlignedRect(rect);
1002
1003     flipForWritingMode(tableAlignedRect);
1004
1005     if (!style()->isHorizontalWritingMode())
1006         tableAlignedRect = tableAlignedRect.transposedRect();
1007
1008     const Vector<int>& columnPos = table()->columnPositions();
1009     // FIXME: The table's direction should determine our row's direction, not the section's (see bug 96691).
1010     if (!style()->isLeftToRightDirection())
1011         tableAlignedRect.setX(columnPos[columnPos.size() - 1] - tableAlignedRect.maxX());
1012
1013     return tableAlignedRect;
1014 }
1015
1016 CellSpan RenderTableSection::dirtiedRows(const LayoutRect& damageRect) const
1017 {
1018     if (m_forceSlowPaintPathWithOverflowingCell) 
1019         return fullTableRowSpan();
1020
1021     CellSpan coveredRows = spannedRows(damageRect);
1022
1023     // To repaint the border we might need to repaint first or last row even if they are not spanned themselves.
1024     if (coveredRows.start() >= m_rowPos.size() - 1 && m_rowPos[m_rowPos.size() - 1] + table()->outerBorderAfter() >= damageRect.y())
1025         --coveredRows.start();
1026
1027     if (!coveredRows.end() && m_rowPos[0] - table()->outerBorderBefore() <= damageRect.maxY())
1028         ++coveredRows.end();
1029
1030     return coveredRows;
1031 }
1032
1033 CellSpan RenderTableSection::dirtiedColumns(const LayoutRect& damageRect) const
1034 {
1035     if (m_forceSlowPaintPathWithOverflowingCell) 
1036         return fullTableColumnSpan();
1037
1038     CellSpan coveredColumns = spannedColumns(damageRect);
1039
1040     const Vector<int>& columnPos = table()->columnPositions();
1041     // To repaint the border we might need to repaint first or last column even if they are not spanned themselves.
1042     if (coveredColumns.start() >= columnPos.size() - 1 && columnPos[columnPos.size() - 1] + table()->outerBorderEnd() >= damageRect.x())
1043         --coveredColumns.start();
1044
1045     if (!coveredColumns.end() && columnPos[0] - table()->outerBorderStart() <= damageRect.maxX())
1046         ++coveredColumns.end();
1047
1048     return coveredColumns;
1049 }
1050
1051 CellSpan RenderTableSection::spannedRows(const LayoutRect& flippedRect) const
1052 {
1053     // Find the first row that starts after rect top.
1054     unsigned nextRow = std::upper_bound(m_rowPos.begin(), m_rowPos.end(), flippedRect.y()) - m_rowPos.begin();
1055
1056     if (nextRow == m_rowPos.size())
1057         return CellSpan(m_rowPos.size() - 1, m_rowPos.size() - 1); // After all rows.
1058
1059     unsigned startRow = nextRow > 0 ? nextRow - 1 : 0;
1060
1061     // Find the first row that starts after rect bottom.
1062     unsigned endRow;
1063     if (m_rowPos[nextRow] >= flippedRect.maxY())
1064         endRow = nextRow;
1065     else {
1066         endRow = std::upper_bound(m_rowPos.begin() + nextRow, m_rowPos.end(), flippedRect.maxY()) - m_rowPos.begin();
1067         if (endRow == m_rowPos.size())
1068             endRow = m_rowPos.size() - 1;
1069     }
1070
1071     return CellSpan(startRow, endRow);
1072 }
1073
1074 CellSpan RenderTableSection::spannedColumns(const LayoutRect& flippedRect) const
1075 {
1076     const Vector<int>& columnPos = table()->columnPositions();
1077
1078     // Find the first column that starts after rect left.
1079     // lower_bound doesn't handle the edge between two cells properly as it would wrongly return the
1080     // cell on the logical top/left.
1081     // upper_bound on the other hand properly returns the cell on the logical bottom/right, which also
1082     // matches the behavior of other browsers.
1083     unsigned nextColumn = std::upper_bound(columnPos.begin(), columnPos.end(), flippedRect.x()) - columnPos.begin();
1084
1085     if (nextColumn == columnPos.size())
1086         return CellSpan(columnPos.size() - 1, columnPos.size() - 1); // After all columns.
1087
1088     unsigned startColumn = nextColumn > 0 ? nextColumn - 1 : 0;
1089
1090     // Find the first column that starts after rect right.
1091     unsigned endColumn;
1092     if (columnPos[nextColumn] >= flippedRect.maxX())
1093         endColumn = nextColumn;
1094     else {
1095         endColumn = std::upper_bound(columnPos.begin() + nextColumn, columnPos.end(), flippedRect.maxX()) - columnPos.begin();
1096         if (endColumn == columnPos.size())
1097             endColumn = columnPos.size() - 1;
1098     }
1099
1100     return CellSpan(startColumn, endColumn);
1101 }
1102
1103
1104 void RenderTableSection::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
1105 {
1106     PaintPhase paintPhase = paintInfo.phase;
1107
1108     LayoutRect localRepaintRect = paintInfo.rect;
1109     localRepaintRect.moveBy(-paintOffset);
1110     localRepaintRect.inflate(maximalOutlineSize(paintPhase));
1111
1112     LayoutRect tableAlignedRect = logicalRectForWritingModeAndDirection(localRepaintRect);
1113
1114     CellSpan dirtiedRows = this->dirtiedRows(tableAlignedRect);
1115     CellSpan dirtiedColumns = this->dirtiedColumns(tableAlignedRect);
1116
1117     if (dirtiedColumns.start() < dirtiedColumns.end()) {
1118         if (!m_hasMultipleCellLevels && !m_overflowingCells.size()) {
1119             if (paintInfo.phase == PaintPhaseCollapsedTableBorders) {
1120                 // Collapsed borders are painted from the bottom right to the top left so that precedence
1121                 // due to cell position is respected.
1122                 for (unsigned r = dirtiedRows.end(); r > dirtiedRows.start(); r--) {
1123                     unsigned row = r - 1;
1124                     for (unsigned c = dirtiedColumns.end(); c > dirtiedColumns.start(); c--) {
1125                         unsigned col = c - 1;
1126                         CellStruct& current = cellAt(row, col);
1127                         RenderTableCell* cell = current.primaryCell();
1128                         if (!cell || (row > dirtiedRows.start() && primaryCellAt(row - 1, col) == cell) || (col > dirtiedColumns.start() && primaryCellAt(row, col - 1) == cell))
1129                             continue;
1130                         LayoutPoint cellPoint = flipForWritingModeForChild(cell, paintOffset);
1131                         cell->paintCollapsedBorders(paintInfo, cellPoint);
1132                     }
1133                 }
1134             } else {
1135                 // Draw the dirty cells in the order that they appear.
1136                 for (unsigned r = dirtiedRows.start(); r < dirtiedRows.end(); r++) {
1137                     RenderTableRow* row = m_grid[r].rowRenderer;
1138                     if (row && !row->hasSelfPaintingLayer())
1139                         row->paintOutlineForRowIfNeeded(paintInfo, paintOffset);
1140                     for (unsigned c = dirtiedColumns.start(); c < dirtiedColumns.end(); c++) {
1141                         CellStruct& current = cellAt(r, c);
1142                         RenderTableCell* cell = current.primaryCell();
1143                         if (!cell || (r > dirtiedRows.start() && primaryCellAt(r - 1, c) == cell) || (c > dirtiedColumns.start() && primaryCellAt(r, c - 1) == cell))
1144                             continue;
1145                         paintCell(cell, paintInfo, paintOffset);
1146                     }
1147                 }
1148             }
1149         } else {
1150             // The overflowing cells should be scarce to avoid adding a lot of cells to the HashSet.
1151 #ifndef NDEBUG
1152             unsigned totalRows = m_grid.size();
1153             unsigned totalCols = table()->columns().size();
1154             ASSERT(m_overflowingCells.size() < totalRows * totalCols * gMaxAllowedOverflowingCellRatioForFastPaintPath);
1155 #endif
1156
1157             // To make sure we properly repaint the section, we repaint all the overflowing cells that we collected.
1158             Vector<RenderTableCell*> cells;
1159             copyToVector(m_overflowingCells, cells);
1160
1161             HashSet<RenderTableCell*> spanningCells;
1162
1163             for (unsigned r = dirtiedRows.start(); r < dirtiedRows.end(); r++) {
1164                 RenderTableRow* row = m_grid[r].rowRenderer;
1165                 if (row && !row->hasSelfPaintingLayer())
1166                     row->paintOutlineForRowIfNeeded(paintInfo, paintOffset);
1167                 for (unsigned c = dirtiedColumns.start(); c < dirtiedColumns.end(); c++) {
1168                     CellStruct& current = cellAt(r, c);
1169                     if (!current.hasCells())
1170                         continue;
1171                     for (unsigned i = 0; i < current.cells.size(); ++i) {
1172                         if (m_overflowingCells.contains(current.cells[i]))
1173                             continue;
1174
1175                         if (current.cells[i]->rowSpan() > 1 || current.cells[i]->colSpan() > 1) {
1176                             if (spanningCells.contains(current.cells[i]))
1177                                 continue;
1178                             spanningCells.add(current.cells[i]);
1179                         }
1180
1181                         cells.append(current.cells[i]);
1182                     }
1183                 }
1184             }
1185
1186             // Sort the dirty cells by paint order.
1187             if (!m_overflowingCells.size())
1188                 std::stable_sort(cells.begin(), cells.end(), compareCellPositions);
1189             else
1190                 std::sort(cells.begin(), cells.end(), compareCellPositionsWithOverflowingCells);
1191
1192             if (paintInfo.phase == PaintPhaseCollapsedTableBorders) {
1193                 for (unsigned i = cells.size(); i > 0; --i) {
1194                     LayoutPoint cellPoint = flipForWritingModeForChild(cells[i - 1], paintOffset);
1195                     cells[i - 1]->paintCollapsedBorders(paintInfo, cellPoint);
1196                 }
1197             } else {
1198                 for (unsigned i = 0; i < cells.size(); ++i)
1199                     paintCell(cells[i], paintInfo, paintOffset);
1200             }
1201         }
1202     }
1203 }
1204
1205 void RenderTableSection::imageChanged(WrappedImagePtr, const IntRect*)
1206 {
1207     // FIXME: Examine cells and repaint only the rect the image paints in.
1208     repaint();
1209 }
1210
1211 void RenderTableSection::recalcCells()
1212 {
1213     ASSERT(m_needsCellRecalc);
1214     // We reset the flag here to ensure that |addCell| works. This is safe to do as
1215     // fillRowsWithDefaultStartingAtPosition makes sure we match the table's columns
1216     // representation.
1217     m_needsCellRecalc = false;
1218
1219     m_cCol = 0;
1220     m_cRow = 0;
1221     m_grid.clear();
1222
1223     for (RenderObject* row = firstChild(); row; row = row->nextSibling()) {
1224         if (row->isTableRow()) {
1225             unsigned insertionRow = m_cRow;
1226             m_cRow++;
1227             m_cCol = 0;
1228             ensureRows(m_cRow);
1229
1230             RenderTableRow* tableRow = toRenderTableRow(row);
1231             m_grid[insertionRow].rowRenderer = tableRow;
1232             tableRow->setRowIndex(insertionRow);
1233             setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(m_grid[insertionRow]);
1234
1235             for (RenderObject* cell = row->firstChild(); cell; cell = cell->nextSibling()) {
1236                 if (!cell->isTableCell())
1237                     continue;
1238
1239                 RenderTableCell* tableCell = toRenderTableCell(cell);
1240                 addCell(tableCell, tableRow);
1241             }
1242         }
1243     }
1244
1245     m_grid.shrinkToFit();
1246     setNeedsLayout(true);
1247 }
1248
1249 // FIXME: This function could be made O(1) in certain cases (like for the non-most-constrainive cells' case).
1250 void RenderTableSection::rowLogicalHeightChanged(unsigned rowIndex)
1251 {
1252     if (needsCellRecalc())
1253         return;
1254
1255     setRowLogicalHeightToRowStyleLogicalHeightIfNotRelative(m_grid[rowIndex]);
1256
1257     for (RenderObject* cell = m_grid[rowIndex].rowRenderer->firstChild(); cell; cell = cell->nextSibling()) {
1258         if (!cell->isTableCell())
1259             continue;
1260
1261         updateLogicalHeightForCell(m_grid[rowIndex], toRenderTableCell(cell));
1262     }
1263 }
1264
1265 void RenderTableSection::setNeedsCellRecalc()
1266 {
1267     m_needsCellRecalc = true;
1268     if (RenderTable* t = table())
1269         t->setNeedsSectionRecalc();
1270 }
1271
1272 unsigned RenderTableSection::numColumns() const
1273 {
1274     unsigned result = 0;
1275     
1276     for (unsigned r = 0; r < m_grid.size(); ++r) {
1277         for (unsigned c = result; c < table()->numEffCols(); ++c) {
1278             const CellStruct& cell = cellAt(r, c);
1279             if (cell.hasCells() || cell.inColSpan)
1280                 result = c;
1281         }
1282     }
1283     
1284     return result + 1;
1285 }
1286
1287 const BorderValue& RenderTableSection::borderAdjoiningStartCell(const RenderTableCell* cell) const
1288 {
1289     ASSERT(cell->isFirstOrLastCellInRow());
1290     return hasSameDirectionAs(cell) ? style()->borderStart() : style()->borderEnd();
1291 }
1292
1293 const BorderValue& RenderTableSection::borderAdjoiningEndCell(const RenderTableCell* cell) const
1294 {
1295     ASSERT(cell->isFirstOrLastCellInRow());
1296     return hasSameDirectionAs(cell) ? style()->borderEnd() : style()->borderStart();
1297 }
1298
1299 const RenderTableCell* RenderTableSection::firstRowCellAdjoiningTableStart() const
1300 {
1301     unsigned adjoiningStartCellColumnIndex = hasSameDirectionAs(table()) ? 0 : table()->lastColumnIndex();
1302     return cellAt(0, adjoiningStartCellColumnIndex).primaryCell();
1303 }
1304
1305 const RenderTableCell* RenderTableSection::firstRowCellAdjoiningTableEnd() const
1306 {
1307     unsigned adjoiningEndCellColumnIndex = hasSameDirectionAs(table()) ? table()->lastColumnIndex() : 0;
1308     return cellAt(0, adjoiningEndCellColumnIndex).primaryCell();
1309 }
1310
1311 void RenderTableSection::appendColumn(unsigned pos)
1312 {
1313     ASSERT(!m_needsCellRecalc);
1314
1315     for (unsigned row = 0; row < m_grid.size(); ++row)
1316         m_grid[row].row.resize(pos + 1);
1317 }
1318
1319 void RenderTableSection::splitColumn(unsigned pos, unsigned first)
1320 {
1321     ASSERT(!m_needsCellRecalc);
1322
1323     if (m_cCol > pos)
1324         m_cCol++;
1325     for (unsigned row = 0; row < m_grid.size(); ++row) {
1326         Row& r = m_grid[row].row;
1327         r.insert(pos + 1, CellStruct());
1328         if (r[pos].hasCells()) {
1329             r[pos + 1].cells.appendVector(r[pos].cells);
1330             RenderTableCell* cell = r[pos].primaryCell();
1331             ASSERT(cell);
1332             ASSERT(cell->colSpan() >= (r[pos].inColSpan ? 1u : 0));
1333             unsigned colleft = cell->colSpan() - r[pos].inColSpan;
1334             if (first > colleft)
1335               r[pos + 1].inColSpan = 0;
1336             else
1337               r[pos + 1].inColSpan = first + r[pos].inColSpan;
1338         } else {
1339             r[pos + 1].inColSpan = 0;
1340         }
1341     }
1342 }
1343
1344 // Hit Testing
1345 bool RenderTableSection::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
1346 {
1347     // If we have no children then we have nothing to do.
1348     if (!firstChild())
1349         return false;
1350
1351     // Table sections cannot ever be hit tested.  Effectively they do not exist.
1352     // Just forward to our children always.
1353     LayoutPoint adjustedLocation = accumulatedOffset + location();
1354
1355     if (hasOverflowClip() && !locationInContainer.intersects(overflowClipRect(adjustedLocation, locationInContainer.region())))
1356         return false;
1357
1358     if (hasOverflowingCell()) {
1359         for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
1360             // FIXME: We have to skip over inline flows, since they can show up inside table rows
1361             // at the moment (a demoted inline <form> for example). If we ever implement a
1362             // table-specific hit-test method (which we should do for performance reasons anyway),
1363             // then we can remove this check.
1364             if (child->isBox() && !toRenderBox(child)->hasSelfPaintingLayer()) {
1365                 LayoutPoint childPoint = flipForWritingModeForChild(toRenderBox(child), adjustedLocation);
1366                 if (child->nodeAtPoint(request, result, locationInContainer, childPoint, action)) {
1367                     updateHitTestResult(result, toLayoutPoint(locationInContainer.point() - childPoint));
1368                     return true;
1369                 }
1370             }
1371         }
1372         return false;
1373     }
1374
1375     recalcCellsIfNeeded();
1376
1377     LayoutRect hitTestRect = locationInContainer.boundingBox();
1378     hitTestRect.moveBy(-adjustedLocation);
1379
1380     LayoutRect tableAlignedRect = logicalRectForWritingModeAndDirection(hitTestRect);
1381     CellSpan rowSpan = spannedRows(tableAlignedRect);
1382     CellSpan columnSpan = spannedColumns(tableAlignedRect);
1383
1384     // Now iterate over the spanned rows and columns.
1385     for (unsigned hitRow = rowSpan.start(); hitRow < rowSpan.end(); ++hitRow) {
1386         for (unsigned hitColumn = columnSpan.start(); hitColumn < columnSpan.end(); ++hitColumn) {
1387             CellStruct& current = cellAt(hitRow, hitColumn);
1388
1389             // If the cell is empty, there's nothing to do
1390             if (!current.hasCells())
1391                 continue;
1392
1393             for (unsigned i = current.cells.size() ; i; ) {
1394                 --i;
1395                 RenderTableCell* cell = current.cells[i];
1396                 LayoutPoint cellPoint = flipForWritingModeForChild(cell, adjustedLocation);
1397                 if (static_cast<RenderObject*>(cell)->nodeAtPoint(request, result, locationInContainer, cellPoint, action)) {
1398                     updateHitTestResult(result, locationInContainer.point() - toLayoutSize(cellPoint));
1399                     return true;
1400                 }
1401             }
1402             if (!result.isRectBasedTest())
1403                 break;
1404         }
1405         if (!result.isRectBasedTest())
1406             break;
1407     }
1408
1409     return false;
1410 }
1411
1412 void RenderTableSection::removeCachedCollapsedBorders(const RenderTableCell* cell)
1413 {
1414     if (!table()->collapseBorders())
1415         return;
1416     
1417     for (int side = CBSBefore; side <= CBSEnd; ++side)
1418         m_cellsCollapsedBorders.remove(make_pair(cell, side));
1419 }
1420
1421 void RenderTableSection::setCachedCollapsedBorder(const RenderTableCell* cell, CollapsedBorderSide side, CollapsedBorderValue border)
1422 {
1423     ASSERT(table()->collapseBorders());
1424     m_cellsCollapsedBorders.set(make_pair(cell, side), border);
1425 }
1426
1427 CollapsedBorderValue& RenderTableSection::cachedCollapsedBorder(const RenderTableCell* cell, CollapsedBorderSide side)
1428 {
1429     ASSERT(table()->collapseBorders());
1430     HashMap<pair<const RenderTableCell*, int>, CollapsedBorderValue>::iterator it = m_cellsCollapsedBorders.find(make_pair(cell, side));
1431     ASSERT(it != m_cellsCollapsedBorders.end());
1432     return it->value;
1433 }
1434
1435 RenderTableSection* RenderTableSection::createAnonymousWithParentRenderer(const RenderObject* parent)
1436 {
1437     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), TABLE_ROW_GROUP);
1438     RenderTableSection* newSection = new (parent->renderArena()) RenderTableSection(0);
1439     newSection->setDocumentForAnonymous(parent->document());
1440     newSection->setStyle(newStyle.release());
1441     return newSection;
1442 }
1443
1444 void RenderTableSection::setLogicalPositionForCell(RenderTableCell* cell, unsigned effectiveColumn) const
1445 {
1446     LayoutPoint oldCellLocation = cell->location();
1447
1448     LayoutPoint cellLocation(0, m_rowPos[cell->rowIndex()]);
1449     int horizontalBorderSpacing = table()->hBorderSpacing();
1450
1451     // FIXME: The table's direction should determine our row's direction, not the section's (see bug 96691).
1452     if (!style()->isLeftToRightDirection())
1453         cellLocation.setX(table()->columnPositions()[table()->numEffCols()] - table()->columnPositions()[table()->colToEffCol(cell->col() + cell->colSpan())] + horizontalBorderSpacing);
1454     else
1455         cellLocation.setX(table()->columnPositions()[effectiveColumn] + horizontalBorderSpacing);
1456
1457     cell->setLogicalLocation(cellLocation);
1458     view()->addLayoutDelta(oldCellLocation - cell->location());
1459 }
1460
1461 } // namespace WebCore