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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, 2007, 2008, 2009 Apple Inc. All rights reserved.
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Library General Public
11  * License as published by the Free Software Foundation; either
12  * version 2 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * Library General Public License for more details.
18  *
19  * You should have received a copy of the GNU Library General Public License
20  * along with this library; see the file COPYING.LIB.  If not, write to
21  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22  * Boston, MA 02110-1301, USA.
23  */
24 
25 #include "config.h"
26 #include "RenderTableCell.h"
27 
28 #include "CollapsedBorderValue.h"
29 #include "FloatQuad.h"
30 #include "GraphicsContext.h"
31 #include "HTMLNames.h"
32 #include "HTMLTableCellElement.h"
33 #include "PaintInfo.h"
34 #include "RenderTableCol.h"
35 #include "RenderView.h"
36 #include "TransformState.h"
37 
38 #ifdef ANDROID_LAYOUT
39 #include "Document.h"
40 #include "Settings.h"
41 #endif
42 
43 using namespace std;
44 
45 namespace WebCore {
46 
47 using namespace HTMLNames;
48 
RenderTableCell(Node * node)49 RenderTableCell::RenderTableCell(Node* node)
50     : RenderBlock(node)
51     , m_row(-1)
52     , m_column(-1)
53     , m_rowSpan(1)
54     , m_columnSpan(1)
55     , m_cellWidthChanged(false)
56     , m_intrinsicPaddingBefore(0)
57     , m_intrinsicPaddingAfter(0)
58 {
59     updateFromElement();
60 }
61 
destroy()62 void RenderTableCell::destroy()
63 {
64     RenderTableSection* recalcSection = parent() ? section() : 0;
65 
66     RenderBlock::destroy();
67 
68     if (recalcSection)
69         recalcSection->setNeedsCellRecalc();
70 }
71 
updateFromElement()72 void RenderTableCell::updateFromElement()
73 {
74     Node* n = node();
75     if (n && (n->hasTagName(tdTag) || n->hasTagName(thTag))) {
76         HTMLTableCellElement* tc = static_cast<HTMLTableCellElement*>(n);
77         int oldRSpan = m_rowSpan;
78         int oldCSpan = m_columnSpan;
79 
80         m_columnSpan = tc->colSpan();
81         m_rowSpan = tc->rowSpan();
82         if ((oldRSpan != m_rowSpan || oldCSpan != m_columnSpan) && style() && parent()) {
83             setNeedsLayoutAndPrefWidthsRecalc();
84             if (section())
85                 section()->setNeedsCellRecalc();
86         }
87     }
88 }
89 
styleOrColLogicalWidth() const90 Length RenderTableCell::styleOrColLogicalWidth() const
91 {
92     Length w = style()->logicalWidth();
93     if (!w.isAuto())
94         return w;
95 
96     if (RenderTableCol* tableCol = table()->colElement(col())) {
97         int colSpanCount = colSpan();
98 
99         Length colWidthSum = Length(0, Fixed);
100         for (int i = 1; i <= colSpanCount; i++) {
101             Length colWidth = tableCol->style()->logicalWidth();
102 
103             // Percentage value should be returned only for colSpan == 1.
104             // Otherwise we return original width for the cell.
105             if (!colWidth.isFixed()) {
106                 if (colSpanCount > 1)
107                     return w;
108                 return colWidth;
109             }
110 
111             colWidthSum = Length(colWidthSum.value() + colWidth.value(), Fixed);
112 
113             tableCol = table()->nextColElement(tableCol);
114             // If no next <col> tag found for the span we just return what we have for now.
115             if (!tableCol)
116                 break;
117         }
118 
119         // Column widths specified on <col> apply to the border box of the cell.
120         // Percentages don't need to be handled since they're always treated this way (even when specified on the cells).
121         // See Bugzilla bug 8126 for details.
122         if (colWidthSum.isFixed() && colWidthSum.value() > 0)
123             colWidthSum = Length(max(0, colWidthSum.value() - borderAndPaddingLogicalWidth()), Fixed);
124         return colWidthSum;
125     }
126 
127     return w;
128 }
129 
computePreferredLogicalWidths()130 void RenderTableCell::computePreferredLogicalWidths()
131 {
132     // The child cells rely on the grids up in the sections to do their computePreferredLogicalWidths work.  Normally the sections are set up early, as table
133     // cells are added, but relayout can cause the cells to be freed, leaving stale pointers in the sections'
134     // grids.  We must refresh those grids before the child cells try to use them.
135     table()->recalcSectionsIfNeeded();
136 
137     RenderBlock::computePreferredLogicalWidths();
138     if (node() && style()->autoWrap()) {
139         // See if nowrap was set.
140         Length w = styleOrColLogicalWidth();
141         String nowrap = static_cast<Element*>(node())->getAttribute(nowrapAttr);
142         if (!nowrap.isNull() && w.isFixed())
143             // Nowrap is set, but we didn't actually use it because of the
144             // fixed width set on the cell.  Even so, it is a WinIE/Moz trait
145             // to make the minwidth of the cell into the fixed width.  They do this
146             // even in strict mode, so do not make this a quirk.  Affected the top
147             // of hiptop.com.
148             m_minPreferredLogicalWidth = max(w.value(), m_minPreferredLogicalWidth);
149     }
150 }
151 
computeLogicalWidth()152 void RenderTableCell::computeLogicalWidth()
153 {
154 #ifdef ANDROID_LAYOUT
155     if (view()->frameView())
156         setVisibleWidth(view()->frameView()->textWrapWidth());
157 #endif
158 }
159 
updateLogicalWidth(int w)160 void RenderTableCell::updateLogicalWidth(int w)
161 {
162     if (w == logicalWidth())
163         return;
164 
165     setLogicalWidth(w);
166     setCellWidthChanged(true);
167 }
168 
layout()169 void RenderTableCell::layout()
170 {
171     layoutBlock(cellWidthChanged());
172     setCellWidthChanged(false);
173 }
174 
paddingTop(bool includeIntrinsicPadding) const175 int RenderTableCell::paddingTop(bool includeIntrinsicPadding) const
176 {
177     int result = RenderBlock::paddingTop();
178     if (!includeIntrinsicPadding || !isHorizontalWritingMode())
179         return result;
180     return result + (style()->writingMode() == TopToBottomWritingMode ? intrinsicPaddingBefore() : intrinsicPaddingAfter());
181 }
182 
paddingBottom(bool includeIntrinsicPadding) const183 int RenderTableCell::paddingBottom(bool includeIntrinsicPadding) const
184 {
185     int result = RenderBlock::paddingBottom();
186     if (!includeIntrinsicPadding || !isHorizontalWritingMode())
187         return result;
188     return result + (style()->writingMode() == TopToBottomWritingMode ? intrinsicPaddingAfter() : intrinsicPaddingBefore());
189 }
190 
paddingLeft(bool includeIntrinsicPadding) const191 int RenderTableCell::paddingLeft(bool includeIntrinsicPadding) const
192 {
193     int result = RenderBlock::paddingLeft();
194     if (!includeIntrinsicPadding || isHorizontalWritingMode())
195         return result;
196     return result + (style()->writingMode() == LeftToRightWritingMode ? intrinsicPaddingBefore() : intrinsicPaddingAfter());
197 
198 }
199 
paddingRight(bool includeIntrinsicPadding) const200 int RenderTableCell::paddingRight(bool includeIntrinsicPadding) const
201 {
202     int result = RenderBlock::paddingRight();
203     if (!includeIntrinsicPadding || isHorizontalWritingMode())
204         return result;
205     return result + (style()->writingMode() == LeftToRightWritingMode ? intrinsicPaddingAfter() : intrinsicPaddingBefore());
206 }
207 
paddingBefore(bool includeIntrinsicPadding) const208 int RenderTableCell::paddingBefore(bool includeIntrinsicPadding) const
209 {
210     int result = RenderBlock::paddingBefore();
211     if (!includeIntrinsicPadding)
212         return result;
213     return result + intrinsicPaddingBefore();
214 }
215 
paddingAfter(bool includeIntrinsicPadding) const216 int RenderTableCell::paddingAfter(bool includeIntrinsicPadding) const
217 {
218     int result = RenderBlock::paddingAfter();
219     if (!includeIntrinsicPadding)
220         return result;
221     return result + intrinsicPaddingAfter();
222 }
223 
setOverrideSize(int size)224 void RenderTableCell::setOverrideSize(int size)
225 {
226     clearIntrinsicPadding();
227     RenderBlock::setOverrideSize(size);
228 }
229 
setOverrideSizeFromRowHeight(int rowHeight)230 void RenderTableCell::setOverrideSizeFromRowHeight(int rowHeight)
231 {
232     clearIntrinsicPadding();
233     RenderBlock::setOverrideSize(max(0, rowHeight - borderBefore() - paddingBefore() - borderAfter() - paddingAfter()));
234 }
235 
offsetFromContainer(RenderObject * o,const IntPoint & point) const236 IntSize RenderTableCell::offsetFromContainer(RenderObject* o, const IntPoint& point) const
237 {
238     ASSERT(o == container());
239 
240     IntSize offset = RenderBlock::offsetFromContainer(o, point);
241     if (parent())
242         offset.expand(-parentBox()->x(), -parentBox()->y());
243 
244     return offset;
245 }
246 
clippedOverflowRectForRepaint(RenderBoxModelObject * repaintContainer)247 IntRect RenderTableCell::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)
248 {
249     // If the table grid is dirty, we cannot get reliable information about adjoining cells,
250     // so we ignore outside borders. This should not be a problem because it means that
251     // the table is going to recalculate the grid, relayout and repaint its current rect, which
252     // includes any outside borders of this cell.
253     if (!table()->collapseBorders() || table()->needsSectionRecalc())
254         return RenderBlock::clippedOverflowRectForRepaint(repaintContainer);
255 
256     bool rtl = !table()->style()->isLeftToRightDirection();
257     int outlineSize = style()->outlineSize();
258     int left = max(borderHalfLeft(true), outlineSize);
259     int right = max(borderHalfRight(true), outlineSize);
260     int top = max(borderHalfTop(true), outlineSize);
261     int bottom = max(borderHalfBottom(true), outlineSize);
262     if ((left && !rtl) || (right && rtl)) {
263         if (RenderTableCell* before = table()->cellBefore(this)) {
264             top = max(top, before->borderHalfTop(true));
265             bottom = max(bottom, before->borderHalfBottom(true));
266         }
267     }
268     if ((left && rtl) || (right && !rtl)) {
269         if (RenderTableCell* after = table()->cellAfter(this)) {
270             top = max(top, after->borderHalfTop(true));
271             bottom = max(bottom, after->borderHalfBottom(true));
272         }
273     }
274     if (top) {
275         if (RenderTableCell* above = table()->cellAbove(this)) {
276             left = max(left, above->borderHalfLeft(true));
277             right = max(right, above->borderHalfRight(true));
278         }
279     }
280     if (bottom) {
281         if (RenderTableCell* below = table()->cellBelow(this)) {
282             left = max(left, below->borderHalfLeft(true));
283             right = max(right, below->borderHalfRight(true));
284         }
285     }
286     left = max(left, -minXVisualOverflow());
287     top = max(top, -minYVisualOverflow());
288     IntRect r(-left, - top, left + max(width() + right, maxXVisualOverflow()), top + max(height() + bottom, maxYVisualOverflow()));
289 
290     if (RenderView* v = view()) {
291         // FIXME: layoutDelta needs to be applied in parts before/after transforms and
292         // repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
293         r.move(v->layoutDelta());
294     }
295     computeRectForRepaint(repaintContainer, r);
296     return r;
297 }
298 
computeRectForRepaint(RenderBoxModelObject * repaintContainer,IntRect & r,bool fixed)299 void RenderTableCell::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& r, bool fixed)
300 {
301     if (repaintContainer == this)
302         return;
303     r.setY(r.y());
304     RenderView* v = view();
305     if ((!v || !v->layoutStateEnabled() || repaintContainer) && parent())
306         r.move(-parentBox()->x(), -parentBox()->y()); // Rows are in the same coordinate space, so don't add their offset in.
307     RenderBlock::computeRectForRepaint(repaintContainer, r, fixed);
308 }
309 
cellBaselinePosition() const310 int RenderTableCell::cellBaselinePosition() const
311 {
312     // <http://www.w3.org/TR/2007/CR-CSS21-20070719/tables.html#height-layout>: The baseline of a cell is the baseline of
313     // the first in-flow line box in the cell, or the first in-flow table-row in the cell, whichever comes first. If there
314     // is no such line box or table-row, the baseline is the bottom of content edge of the cell box.
315     int firstLineBaseline = firstLineBoxBaseline();
316     if (firstLineBaseline != -1)
317         return firstLineBaseline;
318     return paddingBefore() + borderBefore() + contentLogicalHeight();
319 }
320 
styleWillChange(StyleDifference diff,const RenderStyle * newStyle)321 void RenderTableCell::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
322 {
323     if (parent() && section() && style() && style()->height() != newStyle->height())
324         section()->setNeedsCellRecalc();
325 
326     ASSERT(newStyle->display() == TABLE_CELL);
327 
328     RenderBlock::styleWillChange(diff, newStyle);
329 }
330 
styleDidChange(StyleDifference diff,const RenderStyle * oldStyle)331 void RenderTableCell::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
332 {
333     RenderBlock::styleDidChange(diff, oldStyle);
334     setHasBoxDecorations(true);
335 }
336 
337 // The following rules apply for resolving conflicts and figuring out which border
338 // to use.
339 // (1) Borders with the 'border-style' of 'hidden' take precedence over all other conflicting
340 // borders. Any border with this value suppresses all borders at this location.
341 // (2) Borders with a style of 'none' have the lowest priority. Only if the border properties of all
342 // the elements meeting at this edge are 'none' will the border be omitted (but note that 'none' is
343 // the default value for the border style.)
344 // (3) If none of the styles are 'hidden' and at least one of them is not 'none', then narrow borders
345 // are discarded in favor of wider ones. If several have the same 'border-width' then styles are preferred
346 // in this order: 'double', 'solid', 'dashed', 'dotted', 'ridge', 'outset', 'groove', and the lowest: 'inset'.
347 // (4) If border styles differ only in color, then a style set on a cell wins over one on a row,
348 // which wins over a row group, column, column group and, lastly, table. It is undefined which color
349 // is used when two elements of the same type disagree.
compareBorders(const CollapsedBorderValue & border1,const CollapsedBorderValue & border2)350 static int compareBorders(const CollapsedBorderValue& border1, const CollapsedBorderValue& border2)
351 {
352     // Sanity check the values passed in. The null border have lowest priority.
353     if (!border2.exists()) {
354         if (!border1.exists())
355             return 0;
356         return 1;
357     }
358     if (!border1.exists())
359         return -1;
360 
361     // Rule #1 above.
362     if (border2.style() == BHIDDEN) {
363         if (border1.style() == BHIDDEN)
364             return 0;
365         return -1;
366     }
367     if (border1.style() == BHIDDEN)
368         return 1;
369 
370     // Rule #2 above.  A style of 'none' has lowest priority and always loses to any other border.
371     if (border2.style() == BNONE) {
372         if (border1.style() == BNONE)
373             return 0;
374         return 1;
375     }
376     if (border1.style() == BNONE)
377         return -1;
378 
379     // The first part of rule #3 above. Wider borders win.
380     if (border1.width() != border2.width())
381         return border1.width() < border2.width() ? -1 : 1;
382 
383     // The borders have equal width.  Sort by border style.
384     if (border1.style() != border2.style())
385         return border1.style() < border2.style() ? -1 : 1;
386 
387     // The border have the same width and style.  Rely on precedence (cell over row over row group, etc.)
388     if (border1.precedence() == border2.precedence())
389         return 0;
390     return border1.precedence() < border2.precedence() ? -1 : 1;
391 }
392 
chooseBorder(const CollapsedBorderValue & border1,const CollapsedBorderValue & border2)393 static CollapsedBorderValue chooseBorder(const CollapsedBorderValue& border1, const CollapsedBorderValue& border2)
394 {
395     const CollapsedBorderValue& border = compareBorders(border1, border2) < 0 ? border2 : border1;
396     return border.style() == BHIDDEN ? CollapsedBorderValue() : border;
397 }
398 
collapsedStartBorder() const399 CollapsedBorderValue RenderTableCell::collapsedStartBorder() const
400 {
401     RenderTable* table = this->table();
402     bool isStartColumn = col() == 0;
403 
404     // For the start border, we need to check, in order of precedence:
405     // (1) Our start border.
406     int start = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderStartColor, table->style()->direction(), table->style()->writingMode());
407     int end = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderEndColor, table->style()->direction(), table->style()->writingMode());
408     CollapsedBorderValue result(&style()->borderStart(), style()->visitedDependentColor(start), BCELL);
409 
410     // (2) The end border of the preceding cell.
411     if (RenderTableCell* prevCell = table->cellBefore(this)) {
412         CollapsedBorderValue prevCellBorder = CollapsedBorderValue(&prevCell->style()->borderEnd(), prevCell->style()->visitedDependentColor(end), BCELL);
413         result = chooseBorder(prevCellBorder, result);
414         if (!result.exists())
415             return result;
416     } else if (isStartColumn) {
417         // (3) Our row's start border.
418         result = chooseBorder(result, CollapsedBorderValue(&parent()->style()->borderStart(), parent()->style()->visitedDependentColor(start), BROW));
419         if (!result.exists())
420             return result;
421 
422         // (4) Our row group's start border.
423         result = chooseBorder(result, CollapsedBorderValue(&section()->style()->borderStart(), section()->style()->visitedDependentColor(start), BROWGROUP));
424         if (!result.exists())
425             return result;
426     }
427 
428     // (5) Our column and column group's start borders.
429     bool startColEdge;
430     bool endColEdge;
431     RenderTableCol* colElt = table->colElement(col(), &startColEdge, &endColEdge);
432     if (colElt && startColEdge) {
433         result = chooseBorder(result, CollapsedBorderValue(&colElt->style()->borderStart(), colElt->style()->visitedDependentColor(start), BCOL));
434         if (!result.exists())
435             return result;
436         if (colElt->parent()->isTableCol() && !colElt->previousSibling()) {
437             result = chooseBorder(result, CollapsedBorderValue(&colElt->parent()->style()->borderStart(), colElt->parent()->style()->visitedDependentColor(start), BCOLGROUP));
438             if (!result.exists())
439                 return result;
440         }
441     }
442 
443     // (6) The end border of the preceding column.
444     if (!isStartColumn) {
445         colElt = table->colElement(col() -1, &startColEdge, &endColEdge);
446         if (colElt && endColEdge) {
447             CollapsedBorderValue endBorder = CollapsedBorderValue(&colElt->style()->borderEnd(), colElt->style()->visitedDependentColor(end), BCOL);
448             result = chooseBorder(endBorder, result);
449             if (!result.exists())
450                 return result;
451         }
452     } else {
453         // (7) The table's start border.
454         result = chooseBorder(result, CollapsedBorderValue(&table->style()->borderStart(), table->style()->visitedDependentColor(start), BTABLE));
455         if (!result.exists())
456             return result;
457     }
458 
459     return result;
460 }
461 
collapsedEndBorder() const462 CollapsedBorderValue RenderTableCell::collapsedEndBorder() const
463 {
464     RenderTable* table = this->table();
465     bool isEndColumn = table->colToEffCol(col() + colSpan() - 1) == table->numEffCols() - 1;
466 
467     // For end border, we need to check, in order of precedence:
468     // (1) Our end border.
469     int start = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderStartColor, table->style()->direction(), table->style()->writingMode());
470     int end = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderEndColor, table->style()->direction(), table->style()->writingMode());
471     CollapsedBorderValue result = CollapsedBorderValue(&style()->borderEnd(), style()->visitedDependentColor(end), BCELL);
472 
473     // (2) The start border of the following cell.
474     if (!isEndColumn) {
475         RenderTableCell* nextCell = table->cellAfter(this);
476         if (nextCell && nextCell->style()) {
477             CollapsedBorderValue startBorder = CollapsedBorderValue(&nextCell->style()->borderStart(), nextCell->style()->visitedDependentColor(start), BCELL);
478             result = chooseBorder(result, startBorder);
479             if (!result.exists())
480                 return result;
481         }
482     } else {
483         // (3) Our row's end border.
484         result = chooseBorder(result, CollapsedBorderValue(&parent()->style()->borderEnd(), parent()->style()->visitedDependentColor(end), BROW));
485         if (!result.exists())
486             return result;
487 
488         // (4) Our row group's end border.
489         result = chooseBorder(result, CollapsedBorderValue(&section()->style()->borderEnd(), section()->style()->visitedDependentColor(end), BROWGROUP));
490         if (!result.exists())
491             return result;
492     }
493 
494     // (5) Our column and column group's end borders.
495     bool startColEdge;
496     bool endColEdge;
497     RenderTableCol* colElt = table->colElement(col() + colSpan() - 1, &startColEdge, &endColEdge);
498     if (colElt && endColEdge) {
499         result = chooseBorder(result, CollapsedBorderValue(&colElt->style()->borderEnd(), colElt->style()->visitedDependentColor(end), BCOL));
500         if (!result.exists())
501             return result;
502         if (colElt->parent()->isTableCol() && !colElt->nextSibling()) {
503             result = chooseBorder(result, CollapsedBorderValue(&colElt->parent()->style()->borderEnd(), colElt->parent()->style()->visitedDependentColor(end), BCOLGROUP));
504             if (!result.exists())
505                 return result;
506         }
507     }
508 
509     // (6) The start border of the next column.
510     if (!isEndColumn) {
511         colElt = table->colElement(col() + colSpan(), &startColEdge, &endColEdge);
512         if (colElt && startColEdge) {
513             CollapsedBorderValue startBorder = CollapsedBorderValue(&colElt->style()->borderStart(), colElt->style()->visitedDependentColor(start), BCOL);
514             result = chooseBorder(result, startBorder);
515             if (!result.exists())
516                 return result;
517         }
518     } else {
519         // (7) The table's end border.
520         result = chooseBorder(result, CollapsedBorderValue(&table->style()->borderEnd(), table->style()->visitedDependentColor(end), BTABLE));
521         if (!result.exists())
522             return result;
523     }
524 
525     return result;
526 }
527 
collapsedBeforeBorder() const528 CollapsedBorderValue RenderTableCell::collapsedBeforeBorder() const
529 {
530     RenderTable* table = this->table();
531 
532     // For before border, we need to check, in order of precedence:
533     // (1) Our before border.
534     int before = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderBeforeColor, table->style()->direction(), table->style()->writingMode());
535     int after = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderAfterColor, table->style()->direction(), table->style()->writingMode());
536     CollapsedBorderValue result = CollapsedBorderValue(&style()->borderBefore(), style()->visitedDependentColor(before), BCELL);
537 
538     RenderTableCell* prevCell = table->cellAbove(this);
539     if (prevCell) {
540         // (2) A before cell's after border.
541         result = chooseBorder(CollapsedBorderValue(&prevCell->style()->borderAfter(), prevCell->style()->visitedDependentColor(after), BCELL), result);
542         if (!result.exists())
543             return result;
544     }
545 
546     // (3) Our row's before border.
547     result = chooseBorder(result, CollapsedBorderValue(&parent()->style()->borderBefore(), parent()->style()->visitedDependentColor(before), BROW));
548     if (!result.exists())
549         return result;
550 
551     // (4) The previous row's after border.
552     if (prevCell) {
553         RenderObject* prevRow = 0;
554         if (prevCell->section() == section())
555             prevRow = parent()->previousSibling();
556         else
557             prevRow = prevCell->section()->lastChild();
558 
559         if (prevRow) {
560             result = chooseBorder(CollapsedBorderValue(&prevRow->style()->borderAfter(), prevRow->style()->visitedDependentColor(after), BROW), result);
561             if (!result.exists())
562                 return result;
563         }
564     }
565 
566     // Now check row groups.
567     RenderTableSection* currSection = section();
568     if (!row()) {
569         // (5) Our row group's before border.
570         result = chooseBorder(result, CollapsedBorderValue(&currSection->style()->borderBefore(), currSection->style()->visitedDependentColor(before), BROWGROUP));
571         if (!result.exists())
572             return result;
573 
574         // (6) Previous row group's after border.
575         currSection = table->sectionAbove(currSection);
576         if (currSection) {
577             result = chooseBorder(CollapsedBorderValue(&currSection->style()->borderAfter(), currSection->style()->visitedDependentColor(after), BROWGROUP), result);
578             if (!result.exists())
579                 return result;
580         }
581     }
582 
583     if (!currSection) {
584         // (8) Our column and column group's before borders.
585         RenderTableCol* colElt = table->colElement(col());
586         if (colElt) {
587             result = chooseBorder(result, CollapsedBorderValue(&colElt->style()->borderBefore(), colElt->style()->visitedDependentColor(before), BCOL));
588             if (!result.exists())
589                 return result;
590             if (colElt->parent()->isTableCol()) {
591                 result = chooseBorder(result, CollapsedBorderValue(&colElt->parent()->style()->borderBefore(), colElt->parent()->style()->visitedDependentColor(before), BCOLGROUP));
592                 if (!result.exists())
593                     return result;
594             }
595         }
596 
597         // (9) The table's before border.
598         result = chooseBorder(result, CollapsedBorderValue(&table->style()->borderBefore(), table->style()->visitedDependentColor(before), BTABLE));
599         if (!result.exists())
600             return result;
601     }
602 
603     return result;
604 }
605 
collapsedAfterBorder() const606 CollapsedBorderValue RenderTableCell::collapsedAfterBorder() const
607 {
608     RenderTable* table = this->table();
609 
610     // For after border, we need to check, in order of precedence:
611     // (1) Our after border.
612     int before = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderBeforeColor, table->style()->direction(), table->style()->writingMode());
613     int after = CSSProperty::resolveDirectionAwareProperty(CSSPropertyWebkitBorderAfterColor, table->style()->direction(), table->style()->writingMode());
614     CollapsedBorderValue result = CollapsedBorderValue(&style()->borderAfter(), style()->visitedDependentColor(after), BCELL);
615 
616     RenderTableCell* nextCell = table->cellBelow(this);
617     if (nextCell) {
618         // (2) An after cell's before border.
619         result = chooseBorder(result, CollapsedBorderValue(&nextCell->style()->borderBefore(), nextCell->style()->visitedDependentColor(before), BCELL));
620         if (!result.exists())
621             return result;
622     }
623 
624     // (3) Our row's after border. (FIXME: Deal with rowspan!)
625     result = chooseBorder(result, CollapsedBorderValue(&parent()->style()->borderAfter(), parent()->style()->visitedDependentColor(after), BROW));
626     if (!result.exists())
627         return result;
628 
629     // (4) The next row's before border.
630     if (nextCell) {
631         result = chooseBorder(result, CollapsedBorderValue(&nextCell->parent()->style()->borderBefore(), nextCell->parent()->style()->visitedDependentColor(before), BROW));
632         if (!result.exists())
633             return result;
634     }
635 
636     // Now check row groups.
637     RenderTableSection* currSection = section();
638     if (row() + rowSpan() >= currSection->numRows()) {
639         // (5) Our row group's after border.
640         result = chooseBorder(result, CollapsedBorderValue(&currSection->style()->borderAfter(), currSection->style()->visitedDependentColor(after), BROWGROUP));
641         if (!result.exists())
642             return result;
643 
644         // (6) Following row group's before border.
645         currSection = table->sectionBelow(currSection);
646         if (currSection) {
647             result = chooseBorder(result, CollapsedBorderValue(&currSection->style()->borderBefore(), currSection->style()->visitedDependentColor(before), BROWGROUP));
648             if (!result.exists())
649                 return result;
650         }
651     }
652 
653     if (!currSection) {
654         // (8) Our column and column group's after borders.
655         RenderTableCol* colElt = table->colElement(col());
656         if (colElt) {
657             result = chooseBorder(result, CollapsedBorderValue(&colElt->style()->borderAfter(), colElt->style()->visitedDependentColor(after), BCOL));
658             if (!result.exists()) return result;
659             if (colElt->parent()->isTableCol()) {
660                 result = chooseBorder(result, CollapsedBorderValue(&colElt->parent()->style()->borderAfter(), colElt->parent()->style()->visitedDependentColor(after), BCOLGROUP));
661                 if (!result.exists())
662                     return result;
663             }
664         }
665 
666         // (9) The table's after border.
667         result = chooseBorder(result, CollapsedBorderValue(&table->style()->borderAfter(), table->style()->visitedDependentColor(after), BTABLE));
668         if (!result.exists())
669             return result;
670     }
671 
672     return result;
673 }
674 
collapsedLeftBorder() const675 CollapsedBorderValue RenderTableCell::collapsedLeftBorder() const
676 {
677     RenderStyle* tableStyle = table()->style();
678     if (tableStyle->isHorizontalWritingMode())
679         return tableStyle->isLeftToRightDirection() ? collapsedStartBorder() : collapsedEndBorder();
680     return tableStyle->isFlippedBlocksWritingMode() ? collapsedAfterBorder() : collapsedBeforeBorder();
681 }
682 
collapsedRightBorder() const683 CollapsedBorderValue RenderTableCell::collapsedRightBorder() const
684 {
685     RenderStyle* tableStyle = table()->style();
686     if (tableStyle->isHorizontalWritingMode())
687         return tableStyle->isLeftToRightDirection() ? collapsedEndBorder() : collapsedStartBorder();
688     return tableStyle->isFlippedBlocksWritingMode() ? collapsedBeforeBorder() : collapsedAfterBorder();
689 }
690 
collapsedTopBorder() const691 CollapsedBorderValue RenderTableCell::collapsedTopBorder() const
692 {
693     RenderStyle* tableStyle = table()->style();
694     if (tableStyle->isHorizontalWritingMode())
695         return tableStyle->isFlippedBlocksWritingMode() ? collapsedAfterBorder() : collapsedBeforeBorder();
696     return tableStyle->isLeftToRightDirection() ? collapsedStartBorder() : collapsedEndBorder();
697 }
698 
collapsedBottomBorder() const699 CollapsedBorderValue RenderTableCell::collapsedBottomBorder() const
700 {
701     RenderStyle* tableStyle = table()->style();
702     if (tableStyle->isHorizontalWritingMode())
703         return tableStyle->isFlippedBlocksWritingMode() ? collapsedBeforeBorder() : collapsedAfterBorder();
704     return tableStyle->isLeftToRightDirection() ? collapsedEndBorder() : collapsedStartBorder();
705 }
706 
borderLeft() const707 int RenderTableCell::borderLeft() const
708 {
709     return table()->collapseBorders() ? borderHalfLeft(false) : RenderBlock::borderLeft();
710 }
711 
borderRight() const712 int RenderTableCell::borderRight() const
713 {
714     return table()->collapseBorders() ? borderHalfRight(false) : RenderBlock::borderRight();
715 }
716 
borderTop() const717 int RenderTableCell::borderTop() const
718 {
719     return table()->collapseBorders() ? borderHalfTop(false) : RenderBlock::borderTop();
720 }
721 
borderBottom() const722 int RenderTableCell::borderBottom() const
723 {
724     return table()->collapseBorders() ? borderHalfBottom(false) : RenderBlock::borderBottom();
725 }
726 
727 // FIXME: https://bugs.webkit.org/show_bug.cgi?id=46191, make the collapsed border drawing
728 // work with different block flow values instead of being hard-coded to top-to-bottom.
borderStart() const729 int RenderTableCell::borderStart() const
730 {
731     return table()->collapseBorders() ? borderHalfStart(false) : RenderBlock::borderStart();
732 }
733 
borderEnd() const734 int RenderTableCell::borderEnd() const
735 {
736     return table()->collapseBorders() ? borderHalfEnd(false) : RenderBlock::borderEnd();
737 }
738 
borderBefore() const739 int RenderTableCell::borderBefore() const
740 {
741     return table()->collapseBorders() ? borderHalfBefore(false) : RenderBlock::borderBefore();
742 }
743 
borderAfter() const744 int RenderTableCell::borderAfter() const
745 {
746     return table()->collapseBorders() ? borderHalfAfter(false) : RenderBlock::borderAfter();
747 }
748 
borderHalfLeft(bool outer) const749 int RenderTableCell::borderHalfLeft(bool outer) const
750 {
751     RenderStyle* tableStyle = table()->style();
752     if (tableStyle->isHorizontalWritingMode())
753         return tableStyle->isLeftToRightDirection() ? borderHalfStart(outer) : borderHalfEnd(outer);
754     return tableStyle->isFlippedBlocksWritingMode() ? borderHalfAfter(outer) : borderHalfBefore(outer);
755 }
756 
borderHalfRight(bool outer) const757 int RenderTableCell::borderHalfRight(bool outer) const
758 {
759     RenderStyle* tableStyle = table()->style();
760     if (tableStyle->isHorizontalWritingMode())
761         return tableStyle->isLeftToRightDirection() ? borderHalfEnd(outer) : borderHalfStart(outer);
762     return tableStyle->isFlippedBlocksWritingMode() ? borderHalfBefore(outer) : borderHalfAfter(outer);
763 }
764 
borderHalfTop(bool outer) const765 int RenderTableCell::borderHalfTop(bool outer) const
766 {
767     RenderStyle* tableStyle = table()->style();
768     if (tableStyle->isHorizontalWritingMode())
769         return tableStyle->isFlippedBlocksWritingMode() ? borderHalfAfter(outer) : borderHalfBefore(outer);
770     return tableStyle->isLeftToRightDirection() ? borderHalfStart(outer) : borderHalfEnd(outer);
771 }
772 
borderHalfBottom(bool outer) const773 int RenderTableCell::borderHalfBottom(bool outer) const
774 {
775     RenderStyle* tableStyle = table()->style();
776     if (tableStyle->isHorizontalWritingMode())
777         return tableStyle->isFlippedBlocksWritingMode() ? borderHalfBefore(outer) : borderHalfAfter(outer);
778     return tableStyle->isLeftToRightDirection() ? borderHalfEnd(outer) : borderHalfStart(outer);
779 }
780 
borderHalfStart(bool outer) const781 int RenderTableCell::borderHalfStart(bool outer) const
782 {
783     CollapsedBorderValue border = collapsedStartBorder();
784     if (border.exists())
785         return (border.width() + ((table()->style()->isLeftToRightDirection() ^ outer) ? 1 : 0)) / 2; // Give the extra pixel to top and left.
786     return 0;
787 }
788 
borderHalfEnd(bool outer) const789 int RenderTableCell::borderHalfEnd(bool outer) const
790 {
791     CollapsedBorderValue border = collapsedEndBorder();
792     if (border.exists())
793         return (border.width() + ((table()->style()->isLeftToRightDirection() ^ outer) ? 0 : 1)) / 2;
794     return 0;
795 }
796 
borderHalfBefore(bool outer) const797 int RenderTableCell::borderHalfBefore(bool outer) const
798 {
799     CollapsedBorderValue border = collapsedBeforeBorder();
800     if (border.exists())
801         return (border.width() + ((table()->style()->isFlippedBlocksWritingMode() ^ outer) ? 0 : 1)) / 2; // Give the extra pixel to top and left.
802     return 0;
803 }
804 
borderHalfAfter(bool outer) const805 int RenderTableCell::borderHalfAfter(bool outer) const
806 {
807     CollapsedBorderValue border = collapsedAfterBorder();
808     if (border.exists())
809         return (border.width() + ((table()->style()->isFlippedBlocksWritingMode() ^ outer) ? 1 : 0)) / 2;
810     return 0;
811 }
812 
paint(PaintInfo & paintInfo,int tx,int ty)813 void RenderTableCell::paint(PaintInfo& paintInfo, int tx, int ty)
814 {
815     if (paintInfo.phase == PaintPhaseCollapsedTableBorders && style()->visibility() == VISIBLE) {
816         if (!paintInfo.shouldPaintWithinRoot(this))
817             return;
818 
819         tx += x();
820         ty += y();
821         int os = 2 * maximalOutlineSize(paintInfo.phase);
822         if (ty - table()->outerBorderTop() < paintInfo.rect.maxY() + os
823             && ty + height() + table()->outerBorderBottom() > paintInfo.rect.y() - os)
824             paintCollapsedBorder(paintInfo.context, tx, ty, width(), height());
825         return;
826     }
827 
828     RenderBlock::paint(paintInfo, tx, ty);
829 }
830 
collapsedBorderStyle(EBorderStyle style)831 static EBorderStyle collapsedBorderStyle(EBorderStyle style)
832 {
833     if (style == OUTSET)
834         return GROOVE;
835     if (style == INSET)
836         return RIDGE;
837     return style;
838 }
839 
840 struct CollapsedBorder {
841     CollapsedBorderValue borderValue;
842     BoxSide side;
843     bool shouldPaint;
844     int x1;
845     int y1;
846     int x2;
847     int y2;
848     EBorderStyle style;
849 };
850 
851 class CollapsedBorders {
852 public:
CollapsedBorders()853     CollapsedBorders()
854         : m_count(0)
855     {
856     }
857 
addBorder(const CollapsedBorderValue & borderValue,BoxSide borderSide,bool shouldPaint,int x1,int y1,int x2,int y2,EBorderStyle borderStyle)858     void addBorder(const CollapsedBorderValue& borderValue, BoxSide borderSide, bool shouldPaint,
859                    int x1, int y1, int x2, int y2, EBorderStyle borderStyle)
860     {
861         if (borderValue.exists() && shouldPaint) {
862             m_borders[m_count].borderValue = borderValue;
863             m_borders[m_count].side = borderSide;
864             m_borders[m_count].shouldPaint = shouldPaint;
865             m_borders[m_count].x1 = x1;
866             m_borders[m_count].x2 = x2;
867             m_borders[m_count].y1 = y1;
868             m_borders[m_count].y2 = y2;
869             m_borders[m_count].style = borderStyle;
870             m_count++;
871         }
872     }
873 
nextBorder()874     CollapsedBorder* nextBorder()
875     {
876         for (int i = 0; i < m_count; i++) {
877             if (m_borders[i].borderValue.exists() && m_borders[i].shouldPaint) {
878                 m_borders[i].shouldPaint = false;
879                 return &m_borders[i];
880             }
881         }
882 
883         return 0;
884     }
885 
886     CollapsedBorder m_borders[4];
887     int m_count;
888 };
889 
addBorderStyle(RenderTableCell::CollapsedBorderStyles & borderStyles,CollapsedBorderValue borderValue)890 static void addBorderStyle(RenderTableCell::CollapsedBorderStyles& borderStyles, CollapsedBorderValue borderValue)
891 {
892     if (!borderValue.exists())
893         return;
894     size_t count = borderStyles.size();
895     for (size_t i = 0; i < count; ++i)
896         if (borderStyles[i] == borderValue)
897             return;
898     borderStyles.append(borderValue);
899 }
900 
collectBorderStyles(CollapsedBorderStyles & borderStyles) const901 void RenderTableCell::collectBorderStyles(CollapsedBorderStyles& borderStyles) const
902 {
903     addBorderStyle(borderStyles, collapsedStartBorder());
904     addBorderStyle(borderStyles, collapsedEndBorder());
905     addBorderStyle(borderStyles, collapsedBeforeBorder());
906     addBorderStyle(borderStyles, collapsedAfterBorder());
907 }
908 
compareBorderStylesForQSort(const void * pa,const void * pb)909 static int compareBorderStylesForQSort(const void* pa, const void* pb)
910 {
911     const CollapsedBorderValue* a = static_cast<const CollapsedBorderValue*>(pa);
912     const CollapsedBorderValue* b = static_cast<const CollapsedBorderValue*>(pb);
913     if (*a == *b)
914         return 0;
915     return compareBorders(*a, *b);
916 }
917 
sortBorderStyles(CollapsedBorderStyles & borderStyles)918 void RenderTableCell::sortBorderStyles(CollapsedBorderStyles& borderStyles)
919 {
920     qsort(borderStyles.data(), borderStyles.size(), sizeof(CollapsedBorderValue),
921         compareBorderStylesForQSort);
922 }
923 
paintCollapsedBorder(GraphicsContext * graphicsContext,int tx,int ty,int w,int h)924 void RenderTableCell::paintCollapsedBorder(GraphicsContext* graphicsContext, int tx, int ty, int w, int h)
925 {
926     if (!table()->currentBorderStyle())
927         return;
928 
929     CollapsedBorderValue leftVal = collapsedLeftBorder();
930     CollapsedBorderValue rightVal = collapsedRightBorder();
931     CollapsedBorderValue topVal = collapsedTopBorder();
932     CollapsedBorderValue bottomVal = collapsedBottomBorder();
933 
934     // Adjust our x/y/width/height so that we paint the collapsed borders at the correct location.
935     int topWidth = topVal.width();
936     int bottomWidth = bottomVal.width();
937     int leftWidth = leftVal.width();
938     int rightWidth = rightVal.width();
939 
940     tx -= leftWidth / 2;
941     ty -= topWidth / 2;
942     w += leftWidth / 2 + (rightWidth + 1) / 2;
943     h += topWidth / 2 + (bottomWidth + 1) / 2;
944 
945     EBorderStyle topStyle = collapsedBorderStyle(topVal.style());
946     EBorderStyle bottomStyle = collapsedBorderStyle(bottomVal.style());
947     EBorderStyle leftStyle = collapsedBorderStyle(leftVal.style());
948     EBorderStyle rightStyle = collapsedBorderStyle(rightVal.style());
949 
950     bool renderTop = topStyle > BHIDDEN && !topVal.isTransparent();
951     bool renderBottom = bottomStyle > BHIDDEN && !bottomVal.isTransparent();
952     bool renderLeft = leftStyle > BHIDDEN && !leftVal.isTransparent();
953     bool renderRight = rightStyle > BHIDDEN && !rightVal.isTransparent();
954 
955     // We never paint diagonals at the joins.  We simply let the border with the highest
956     // precedence paint on top of borders with lower precedence.
957     CollapsedBorders borders;
958     borders.addBorder(topVal, BSTop, renderTop, tx, ty, tx + w, ty + topWidth, topStyle);
959     borders.addBorder(bottomVal, BSBottom, renderBottom, tx, ty + h - bottomWidth, tx + w, ty + h, bottomStyle);
960     borders.addBorder(leftVal, BSLeft, renderLeft, tx, ty, tx + leftWidth, ty + h, leftStyle);
961     borders.addBorder(rightVal, BSRight, renderRight, tx + w - rightWidth, ty, tx + w, ty + h, rightStyle);
962 
963     for (CollapsedBorder* border = borders.nextBorder(); border; border = borders.nextBorder()) {
964         if (border->borderValue == *table()->currentBorderStyle())
965             drawLineForBoxSide(graphicsContext, border->x1, border->y1, border->x2, border->y2, border->side,
966                                border->borderValue.color(), border->style, 0, 0);
967     }
968 }
969 
paintBackgroundsBehindCell(PaintInfo & paintInfo,int tx,int ty,RenderObject * backgroundObject)970 void RenderTableCell::paintBackgroundsBehindCell(PaintInfo& paintInfo, int tx, int ty, RenderObject* backgroundObject)
971 {
972     if (!paintInfo.shouldPaintWithinRoot(this))
973         return;
974 
975     if (!backgroundObject)
976         return;
977 
978     if (style()->visibility() != VISIBLE)
979         return;
980 
981     RenderTable* tableElt = table();
982     if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
983         return;
984 
985     if (backgroundObject != this) {
986         tx += x();
987         ty += y();
988     }
989 
990     int w = width();
991     int h = height();
992 
993     Color c = backgroundObject->style()->visitedDependentColor(CSSPropertyBackgroundColor);
994     const FillLayer* bgLayer = backgroundObject->style()->backgroundLayers();
995 
996     if (bgLayer->hasImage() || c.isValid()) {
997         // We have to clip here because the background would paint
998         // on top of the borders otherwise.  This only matters for cells and rows.
999         bool shouldClip = backgroundObject->hasLayer() && (backgroundObject == this || backgroundObject == parent()) && tableElt->collapseBorders();
1000         if (shouldClip) {
1001             IntRect clipRect(tx + borderLeft(), ty + borderTop(),
1002                 w - borderLeft() - borderRight(), h - borderTop() - borderBottom());
1003             paintInfo.context->save();
1004             paintInfo.context->clip(clipRect);
1005         }
1006         paintFillLayers(paintInfo, c, bgLayer, tx, ty, w, h, CompositeSourceOver, backgroundObject);
1007         if (shouldClip)
1008             paintInfo.context->restore();
1009     }
1010 }
1011 
paintBoxDecorations(PaintInfo & paintInfo,int tx,int ty)1012 void RenderTableCell::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
1013 {
1014     if (!paintInfo.shouldPaintWithinRoot(this))
1015         return;
1016 
1017     RenderTable* tableElt = table();
1018     if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
1019         return;
1020 
1021     int w = width();
1022     int h = height();
1023 
1024     paintBoxShadow(paintInfo.context, tx, ty, w, h, style(), Normal);
1025 
1026     // Paint our cell background.
1027     paintBackgroundsBehindCell(paintInfo, tx, ty, this);
1028 
1029     paintBoxShadow(paintInfo.context, tx, ty, w, h, style(), Inset);
1030 
1031     if (!style()->hasBorder() || tableElt->collapseBorders())
1032         return;
1033 
1034     paintBorder(paintInfo.context, tx, ty, w, h, style());
1035 }
1036 
paintMask(PaintInfo & paintInfo,int tx,int ty)1037 void RenderTableCell::paintMask(PaintInfo& paintInfo, int tx, int ty)
1038 {
1039     if (style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
1040         return;
1041 
1042     RenderTable* tableElt = table();
1043     if (!tableElt->collapseBorders() && style()->emptyCells() == HIDE && !firstChild())
1044         return;
1045 
1046     int w = width();
1047     int h = height();
1048 
1049     paintMaskImages(paintInfo, tx, ty, w, h);
1050 }
1051 
scrollbarsChanged(bool horizontalScrollbarChanged,bool verticalScrollbarChanged)1052 void RenderTableCell::scrollbarsChanged(bool horizontalScrollbarChanged, bool verticalScrollbarChanged)
1053 {
1054     int scrollbarHeight = scrollbarLogicalHeight();
1055     if (!scrollbarHeight)
1056         return; // Not sure if we should be doing something when a scrollbar goes away or not.
1057 
1058     // We only care if the scrollbar that affects our intrinsic padding has been added.
1059     if ((isHorizontalWritingMode() && !horizontalScrollbarChanged) ||
1060         (!isHorizontalWritingMode() && !verticalScrollbarChanged))
1061         return;
1062 
1063     // Shrink our intrinsic padding as much as possible to accommodate the scrollbar.
1064     if (style()->verticalAlign() == MIDDLE) {
1065         int totalHeight = logicalHeight();
1066         int heightWithoutIntrinsicPadding = totalHeight - intrinsicPaddingBefore() - intrinsicPaddingAfter();
1067         totalHeight -= scrollbarHeight;
1068         int newBeforePadding = (totalHeight - heightWithoutIntrinsicPadding) / 2;
1069         int newAfterPadding = totalHeight - heightWithoutIntrinsicPadding - newBeforePadding;
1070         setIntrinsicPaddingBefore(newBeforePadding);
1071         setIntrinsicPaddingAfter(newAfterPadding);
1072     } else
1073         setIntrinsicPaddingAfter(intrinsicPaddingAfter() - scrollbarHeight);
1074 }
1075 
1076 } // namespace WebCore
1077