summaryrefslogtreecommitdiffstats
path: root/layout/tables/nsTableCellFrame.cpp
blob: 70556d5e289b05a347cb2f5d598d82ea6df3bdbc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsTableCellFrame.h"

#include "gfxContext.h"
#include "gfxUtils.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/PresShell.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Helpers.h"
#include "nsTableFrame.h"
#include "nsTableColFrame.h"
#include "nsTableRowFrame.h"
#include "nsTableRowGroupFrame.h"
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsCSSRendering.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsIFrameInlines.h"
#include "nsIScrollableFrame.h"
#include "nsGenericHTMLElement.h"
#include "nsAttrValueInlines.h"
#include "nsHTMLParts.h"
#include "nsGkAtoms.h"
#include "nsDisplayList.h"
#include "nsLayoutUtils.h"
#include "nsTextFrame.h"
#include <algorithm>

// TABLECELL SELECTION
#include "nsFrameSelection.h"
#include "mozilla/LookAndFeel.h"

#ifdef ACCESSIBILITY
#  include "nsAccessibilityService.h"
#endif

using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::image;

nsTableCellFrame::nsTableCellFrame(ComputedStyle* aStyle,
                                   nsTableFrame* aTableFrame, ClassID aID)
    : nsContainerFrame(aStyle, aTableFrame->PresContext(), aID),
      mDesiredSize(aTableFrame->GetWritingMode()) {
  mColIndex = 0;
  mPriorAvailISize = 0;

  SetContentEmpty(false);
}

nsTableCellFrame::~nsTableCellFrame() = default;

NS_IMPL_FRAMEARENA_HELPERS(nsTableCellFrame)

void nsTableCellFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
                            nsIFrame* aPrevInFlow) {
  // Let the base class do its initialization
  nsContainerFrame::Init(aContent, aParent, aPrevInFlow);

  if (HasAnyStateBits(NS_FRAME_FONT_INFLATION_CONTAINER)) {
    AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
  }

  if (aPrevInFlow) {
    // Set the column index
    nsTableCellFrame* cellFrame = (nsTableCellFrame*)aPrevInFlow;
    uint32_t colIndex = cellFrame->ColIndex();
    SetColIndex(colIndex);
  } else {
    // Although the spec doesn't say that writing-mode is not applied to
    // table-cells, we still override style value here because we want to
    // make effective writing mode of table structure frames consistent
    // within a table. The content inside table cells is reflowed by an
    // anonymous block, hence their writing mode is not affected.
    mWritingMode = GetTableFrame()->GetWritingMode();
  }
}

void nsTableCellFrame::Destroy(DestroyContext& aContext) {
  nsTableFrame::MaybeUnregisterPositionedTablePart(this);
  nsContainerFrame::Destroy(aContext);
}

// nsIPercentBSizeObserver methods

void nsTableCellFrame::NotifyPercentBSize(const ReflowInput& aReflowInput) {
  // ReflowInput ensures the mCBReflowInput of blocks inside a
  // cell is the cell frame, not the inner-cell block, and that the
  // containing block of an inner table is the containing block of its
  // table wrapper.
  // XXXldb Given the now-stricter |NeedsToObserve|, many if not all of
  // these tests are probably unnecessary.

  // Maybe the cell reflow input; we sure if we're inside the |if|.
  const ReflowInput* cellRI = aReflowInput.mCBReflowInput;

  if (cellRI && cellRI->mFrame == this &&
      (cellRI->ComputedBSize() == NS_UNCONSTRAINEDSIZE ||
       cellRI->ComputedBSize() == 0)) {  // XXXldb Why 0?
    // This is a percentage bsize on a frame whose percentage bsizes
    // are based on the bsize of the cell, since its containing block
    // is the inner cell frame.

    // We'll only honor the percent bsize if sibling-cells/ancestors
    // have specified/pct bsize. (Also, siblings only count for this if
    // both this cell and the sibling cell span exactly 1 row.)

    if (nsTableFrame::AncestorsHaveStyleBSize(*cellRI) ||
        (GetTableFrame()->GetEffectiveRowSpan(*this) == 1 &&
         cellRI->mParentReflowInput->mFrame->HasAnyStateBits(
             NS_ROW_HAS_CELL_WITH_STYLE_BSIZE))) {
      for (const ReflowInput* rs = aReflowInput.mParentReflowInput;
           rs != cellRI; rs = rs->mParentReflowInput) {
        rs->mFrame->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
      }

      nsTableFrame::RequestSpecialBSizeReflow(*cellRI);
    }
  }
}

// The cell needs to observe its block and things inside its block but nothing
// below that
bool nsTableCellFrame::NeedsToObserve(const ReflowInput& aReflowInput) {
  const ReflowInput* rs = aReflowInput.mParentReflowInput;
  if (!rs) return false;
  if (rs->mFrame == this) {
    // We always observe the child block.  It will never send any
    // notifications, but we need this so that the observer gets
    // propagated to its kids.
    return true;
  }
  rs = rs->mParentReflowInput;
  if (!rs) {
    return false;
  }

  // We always need to let the percent bsize observer be propagated
  // from a table wrapper frame to an inner table frame.
  LayoutFrameType fType = aReflowInput.mFrame->Type();
  if (fType == LayoutFrameType::Table) {
    return true;
  }

  // We need the observer to be propagated to all children of the cell
  // (i.e., children of the child block) in quirks mode, but only to
  // tables in standards mode.
  // XXX This may not be true in the case of orthogonal flows within
  // the cell (bug 1174711 comment 8); we may need to observe isizes
  // instead of bsizes for orthogonal children.
  return rs->mFrame == this &&
         (PresContext()->CompatibilityMode() == eCompatibility_NavQuirks ||
          fType == LayoutFrameType::TableWrapper);
}

nsresult nsTableCellFrame::AttributeChanged(int32_t aNameSpaceID,
                                            nsAtom* aAttribute,
                                            int32_t aModType) {
  // We need to recalculate in this case because of the nowrap quirk in
  // BasicTableLayoutStrategy
  if (aNameSpaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::nowrap &&
      PresContext()->CompatibilityMode() == eCompatibility_NavQuirks) {
    PresShell()->FrameNeedsReflow(this, IntrinsicDirty::FrameAndAncestors,
                                  NS_FRAME_IS_DIRTY);
  }

  const nsAtom* colSpanAttribute =
      MOZ_UNLIKELY(mContent->AsElement()->IsMathMLElement())
          ? nsGkAtoms::columnspan_
          : nsGkAtoms::colspan;
  if (aAttribute == nsGkAtoms::rowspan || aAttribute == colSpanAttribute) {
    nsLayoutUtils::PostRestyleEvent(mContent->AsElement(), RestyleHint{0},
                                    nsChangeHint_UpdateTableCellSpans);
  }
  return NS_OK;
}

/* virtual */
void nsTableCellFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
  nsContainerFrame::DidSetComputedStyle(aOldComputedStyle);
  nsTableFrame::PositionedTablePartMaybeChanged(this, aOldComputedStyle);

  if (!aOldComputedStyle) {
    return;  // avoid the following on init
  }

#ifdef ACCESSIBILITY
  if (nsAccessibilityService* accService = GetAccService()) {
    if (StyleBorder()->GetComputedBorder() !=
        aOldComputedStyle->StyleBorder()->GetComputedBorder()) {
      // If a table cell's computed border changes, it can change whether or
      // not its parent table is classified as a layout or data table. We
      // send a notification here to invalidate the a11y cache on the table
      // so the next fetch of IsProbablyLayoutTable() is accurate.
      accService->TableLayoutGuessMaybeChanged(PresShell(), mContent);
    }
  }
#endif

  nsTableFrame* tableFrame = GetTableFrame();
  if (tableFrame->IsBorderCollapse() &&
      tableFrame->BCRecalcNeeded(aOldComputedStyle, Style())) {
    uint32_t colIndex = ColIndex();
    uint32_t rowIndex = RowIndex();
    // row span needs to be clamped as we do not create rows in the cellmap
    // which do not have cells originating in them
    TableArea damageArea(colIndex, rowIndex, GetColSpan(),
                         std::min(static_cast<uint32_t>(GetRowSpan()),
                                  tableFrame->GetRowCount() - rowIndex));
    tableFrame->AddBCDamageArea(damageArea);
  }
}

#ifdef DEBUG
void nsTableCellFrame::AppendFrames(ChildListID aListID,
                                    nsFrameList&& aFrameList) {
  MOZ_CRASH("unsupported operation");
}

void nsTableCellFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
                                    const nsLineList::iterator* aPrevFrameLine,
                                    nsFrameList&& aFrameList) {
  MOZ_CRASH("unsupported operation");
}

void nsTableCellFrame::RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) {
  MOZ_CRASH("unsupported operation");
}
#endif

void nsTableCellFrame::SetColIndex(int32_t aColIndex) { mColIndex = aColIndex; }

/* virtual */
nsMargin nsTableCellFrame::GetUsedMargin() const {
  return nsMargin(0, 0, 0, 0);
}

// ASSURE DIFFERENT COLORS for selection
inline nscolor EnsureDifferentColors(nscolor colorA, nscolor colorB) {
  if (colorA == colorB) {
    nscolor res;
    res = NS_RGB(NS_GET_R(colorA) ^ 0xff, NS_GET_G(colorA) ^ 0xff,
                 NS_GET_B(colorA) ^ 0xff);
    return res;
  }
  return colorA;
}

void nsTableCellFrame::DecorateForSelection(DrawTarget* aDrawTarget,
                                            nsPoint aPt) {
  NS_ASSERTION(IsSelected(), "Should only be called for selected cells");
  int16_t displaySelection;
  displaySelection = DetermineDisplaySelection();
  if (displaySelection) {
    RefPtr<nsFrameSelection> frameSelection = PresShell()->FrameSelection();

    if (frameSelection->IsInTableSelectionMode()) {
      nscolor bordercolor;
      if (displaySelection == nsISelectionController::SELECTION_DISABLED) {
        bordercolor = NS_RGB(176, 176, 176);  // disabled color
      } else {
        bordercolor = LookAndFeel::Color(LookAndFeel::ColorID::Highlight, this);
      }
      nscoord threePx = nsPresContext::CSSPixelsToAppUnits(3);
      if ((mRect.width > threePx) && (mRect.height > threePx)) {
        // compare bordercolor to background-color
        bordercolor = EnsureDifferentColors(
            bordercolor, StyleBackground()->BackgroundColor(this));

        int32_t appUnitsPerDevPixel = PresContext()->AppUnitsPerDevPixel();
        Point devPixelOffset = NSPointToPoint(aPt, appUnitsPerDevPixel);

        AutoRestoreTransform autoRestoreTransform(aDrawTarget);
        aDrawTarget->SetTransform(
            aDrawTarget->GetTransform().PreTranslate(devPixelOffset));

        ColorPattern color(ToDeviceColor(bordercolor));

        nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);

        StrokeLineWithSnapping(nsPoint(onePixel, 0), nsPoint(mRect.width, 0),
                               appUnitsPerDevPixel, *aDrawTarget, color);
        StrokeLineWithSnapping(nsPoint(0, onePixel), nsPoint(0, mRect.height),
                               appUnitsPerDevPixel, *aDrawTarget, color);
        StrokeLineWithSnapping(nsPoint(onePixel, mRect.height),
                               nsPoint(mRect.width, mRect.height),
                               appUnitsPerDevPixel, *aDrawTarget, color);
        StrokeLineWithSnapping(nsPoint(mRect.width, onePixel),
                               nsPoint(mRect.width, mRect.height),
                               appUnitsPerDevPixel, *aDrawTarget, color);
        // middle
        nsRect r(onePixel, onePixel, mRect.width - onePixel,
                 mRect.height - onePixel);
        Rect devPixelRect =
            NSRectToSnappedRect(r, appUnitsPerDevPixel, *aDrawTarget);
        aDrawTarget->StrokeRect(devPixelRect, color);
        // shading
        StrokeLineWithSnapping(
            nsPoint(2 * onePixel, mRect.height - 2 * onePixel),
            nsPoint(mRect.width - onePixel, mRect.height - (2 * onePixel)),
            appUnitsPerDevPixel, *aDrawTarget, color);
        StrokeLineWithSnapping(
            nsPoint(mRect.width - (2 * onePixel), 2 * onePixel),
            nsPoint(mRect.width - (2 * onePixel), mRect.height - onePixel),
            appUnitsPerDevPixel, *aDrawTarget, color);
      }
    }
  }
}

void nsTableCellFrame::ProcessBorders(nsTableFrame* aFrame,
                                      nsDisplayListBuilder* aBuilder,
                                      const nsDisplayListSet& aLists) {
  const nsStyleBorder* borderStyle = StyleBorder();
  if (aFrame->IsBorderCollapse() || !borderStyle->HasBorder()) {
    return;
  }

  if (!GetContentEmpty() ||
      StyleTableBorder()->mEmptyCells == StyleEmptyCells::Show) {
    aLists.BorderBackground()->AppendNewToTop<nsDisplayBorder>(aBuilder, this);
  }
}

void nsTableCellFrame::InvalidateFrame(uint32_t aDisplayItemKey,
                                       bool aRebuildDisplayItems) {
  nsIFrame::InvalidateFrame(aDisplayItemKey, aRebuildDisplayItems);
  if (GetTableFrame()->IsBorderCollapse()) {
    const bool rebuild = StaticPrefs::layout_display_list_retain_sc();
    GetParent()->InvalidateFrameWithRect(InkOverflowRect() + GetPosition(),
                                         aDisplayItemKey, rebuild);
  }
}

void nsTableCellFrame::InvalidateFrameWithRect(const nsRect& aRect,
                                               uint32_t aDisplayItemKey,
                                               bool aRebuildDisplayItems) {
  nsIFrame::InvalidateFrameWithRect(aRect, aDisplayItemKey,
                                    aRebuildDisplayItems);
  // If we have filters applied that would affects our bounds, then
  // we get an inactive layer created and this is computed
  // within FrameLayerBuilder
  GetParent()->InvalidateFrameWithRect(aRect + GetPosition(), aDisplayItemKey,
                                       aRebuildDisplayItems);
}

bool nsTableCellFrame::ShouldPaintBordersAndBackgrounds() const {
  // If we're not visible, we don't paint.
  if (!StyleVisibility()->IsVisible()) {
    return false;
  }

  // Consider 'empty-cells', but only in separated borders mode.
  if (!GetContentEmpty()) {
    return true;
  }

  nsTableFrame* tableFrame = GetTableFrame();
  if (tableFrame->IsBorderCollapse()) {
    return true;
  }

  return StyleTableBorder()->mEmptyCells == StyleEmptyCells::Show;
}

bool nsTableCellFrame::ShouldPaintBackground(nsDisplayListBuilder* aBuilder) {
  return ShouldPaintBordersAndBackgrounds();
}

LogicalSides nsTableCellFrame::GetLogicalSkipSides() const {
  LogicalSides skip(mWritingMode);
  if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
                   StyleBoxDecorationBreak::Clone)) {
    return skip;
  }

  if (GetPrevInFlow()) {
    skip |= eLogicalSideBitsBStart;
  }
  if (GetNextInFlow()) {
    skip |= eLogicalSideBitsBEnd;
  }
  return skip;
}

/* virtual */
nsMargin nsTableCellFrame::GetBorderOverflow() { return nsMargin(0, 0, 0, 0); }

// Align the cell's child frame within the cell

void nsTableCellFrame::BlockDirAlignChild(WritingMode aWM, nscoord aMaxAscent) {
  /* It's the 'border-collapse' on the table that matters */
  const LogicalMargin border = GetLogicalUsedBorder(GetWritingMode())
                                   .ApplySkipSides(GetLogicalSkipSides())
                                   .ConvertTo(aWM, GetWritingMode());

  nscoord bStartInset = border.BStart(aWM);
  nscoord bEndInset = border.BEnd(aWM);

  nscoord bSize = BSize(aWM);
  nsIFrame* firstKid = mFrames.FirstChild();
  nsSize containerSize = mRect.Size();
  NS_ASSERTION(firstKid,
               "Frame construction error, a table cell always has "
               "an inner cell frame");
  LogicalRect kidRect = firstKid->GetLogicalRect(aWM, containerSize);
  nscoord childBSize = kidRect.BSize(aWM);

  // Vertically align the child
  nscoord kidBStart = 0;
  switch (GetVerticalAlign()) {
    case StyleVerticalAlignKeyword::Baseline:
      if (!GetContentEmpty()) {
        // Align the baselines of the child frame with the baselines of
        // other children in the same row which have 'vertical-align: baseline'
        kidBStart = bStartInset + aMaxAscent - GetCellBaseline();
        break;
      }
      // Empty cells don't participate in baseline alignment -
      // fallback to start alignment.
      [[fallthrough]];
    case StyleVerticalAlignKeyword::Top:
      // Align the top of the child frame with the top of the content area,
      kidBStart = bStartInset;
      break;

    case StyleVerticalAlignKeyword::Bottom:
      // Align the bottom of the child frame with the bottom of the content
      // area,
      kidBStart = bSize - childBSize - bEndInset;
      break;

    default:
    case StyleVerticalAlignKeyword::Middle:
      // Align the middle of the child frame with the middle of the content
      // area,
      kidBStart = (bSize - childBSize - bEndInset + bStartInset) / 2;
  }
  // If the content is larger than the cell bsize, align from bStartInset
  // (cell's content-box bstart edge).
  kidBStart = std::max(bStartInset, kidBStart);

  if (kidBStart != kidRect.BStart(aWM)) {
    // Invalidate at the old position first
    firstKid->InvalidateFrameSubtree();
  }

  firstKid->SetPosition(aWM, LogicalPoint(aWM, kidRect.IStart(aWM), kidBStart),
                        containerSize);
  ReflowOutput desiredSize(aWM);
  desiredSize.SetSize(aWM, GetLogicalSize(aWM));

  nsRect overflow(nsPoint(0, 0), GetSize());
  overflow.Inflate(GetBorderOverflow());
  desiredSize.mOverflowAreas.SetAllTo(overflow);
  ConsiderChildOverflow(desiredSize.mOverflowAreas, firstKid);
  FinishAndStoreOverflow(&desiredSize);
  if (kidBStart != kidRect.BStart(aWM)) {
    // Make sure any child views are correctly positioned. We know the inner
    // table cell won't have a view
    nsContainerFrame::PositionChildViews(firstKid);

    // Invalidate new overflow rect
    firstKid->InvalidateFrameSubtree();
  }
  if (HasView()) {
    nsContainerFrame::SyncFrameViewAfterReflow(PresContext(), this, GetView(),
                                               desiredSize.InkOverflow(),
                                               ReflowChildFlags::Default);
  }
}

bool nsTableCellFrame::ComputeCustomOverflow(OverflowAreas& aOverflowAreas) {
  nsRect bounds(nsPoint(0, 0), GetSize());
  bounds.Inflate(GetBorderOverflow());

  aOverflowAreas.UnionAllWith(bounds);
  return nsContainerFrame::ComputeCustomOverflow(aOverflowAreas);
}

// Per CSS 2.1, we map 'sub', 'super', 'text-top', 'text-bottom',
// length, percentage, and calc() values to 'baseline'.
StyleVerticalAlignKeyword nsTableCellFrame::GetVerticalAlign() const {
  const StyleVerticalAlign& verticalAlign = StyleDisplay()->mVerticalAlign;
  if (verticalAlign.IsKeyword()) {
    auto value = verticalAlign.AsKeyword();
    if (value == StyleVerticalAlignKeyword::Top ||
        value == StyleVerticalAlignKeyword::Middle ||
        value == StyleVerticalAlignKeyword::Bottom) {
      return value;
    }
  }
  return StyleVerticalAlignKeyword::Baseline;
}

static bool CellHasVisibleContent(nsTableFrame* aTableFrame,
                                  nsTableCellFrame* aCell) {
  // see  http://www.w3.org/TR/CSS21/tables.html#empty-cells
  nsIFrame* content = aCell->CellContentFrame();
  if (content->GetContentRect().Height() > 0) {
    return true;
  }
  if (aTableFrame->IsBorderCollapse()) {
    return true;
  }
  for (nsIFrame* innerFrame : content->PrincipalChildList()) {
    LayoutFrameType frameType = innerFrame->Type();
    if (LayoutFrameType::Text == frameType) {
      nsTextFrame* textFrame = static_cast<nsTextFrame*>(innerFrame);
      if (textFrame->HasNoncollapsedCharacters()) {
        return true;
      }
    } else if (LayoutFrameType::Placeholder != frameType) {
      return true;
    } else if (nsLayoutUtils::GetFloatFromPlaceholder(innerFrame)) {
      return true;
    }
  }
  return false;
}

nsIFrame* nsTableCellFrame::CellContentFrame() const {
  nsIFrame* inner = mFrames.FirstChild();
  if (nsIScrollableFrame* sf = do_QueryFrame(inner)) {
    return sf->GetScrolledFrame();
  }
  return inner;
}

nscoord nsTableCellFrame::GetCellBaseline() const {
  // Ignore the position of the inner frame relative to the cell frame
  // since we want the position as though the inner were top-aligned.
  nsIFrame* inner = mFrames.FirstChild();
  const auto wm = GetWritingMode();
  nscoord result;
  if (!StyleDisplay()->IsContainLayout() &&
      nsLayoutUtils::GetFirstLineBaseline(wm, inner, &result)) {
    // `result` already includes the padding-start from the inner frame.
    return result + GetLogicalUsedBorder(wm).BStart(wm);
  }
  return CellContentFrame()->ContentBSize(wm) +
         GetLogicalUsedBorderAndPadding(wm).BStart(wm);
}

int32_t nsTableCellFrame::GetRowSpan() {
  int32_t rowSpan = 1;

  // Don't look at the content's rowspan if we're a pseudo cell
  if (!Style()->IsPseudoOrAnonBox()) {
    dom::Element* elem = mContent->AsElement();
    const nsAttrValue* attr = elem->GetParsedAttr(nsGkAtoms::rowspan);
    // Note that we don't need to check the tag name, because only table cells
    // (including MathML <mtd>) and table headers parse the "rowspan" attribute
    // into an integer.
    if (attr && attr->Type() == nsAttrValue::eInteger) {
      rowSpan = attr->GetIntegerValue();
    }
  }
  return rowSpan;
}

int32_t nsTableCellFrame::GetColSpan() {
  int32_t colSpan = 1;

  // Don't look at the content's colspan if we're a pseudo cell
  if (!Style()->IsPseudoOrAnonBox()) {
    dom::Element* elem = mContent->AsElement();
    const nsAttrValue* attr = elem->GetParsedAttr(
        MOZ_UNLIKELY(elem->IsMathMLElement()) ? nsGkAtoms::columnspan_
                                              : nsGkAtoms::colspan);
    // Note that we don't need to check the tag name, because only table cells
    // (including MathML <mtd>) and table headers parse the "colspan" attribute
    // into an integer.
    if (attr && attr->Type() == nsAttrValue::eInteger) {
      colSpan = attr->GetIntegerValue();
    }
  }
  return colSpan;
}

nsIScrollableFrame* nsTableCellFrame::GetScrollTargetFrame() const {
  return do_QueryFrame(mFrames.FirstChild());
}

/* virtual */
nscoord nsTableCellFrame::GetMinISize(gfxContext* aRenderingContext) {
  nscoord result = 0;
  DISPLAY_MIN_INLINE_SIZE(this, result);

  nsIFrame* inner = mFrames.FirstChild();
  result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, inner,
                                                IntrinsicISizeType::MinISize,
                                                nsLayoutUtils::IGNORE_PADDING);
  return result;
}

/* virtual */
nscoord nsTableCellFrame::GetPrefISize(gfxContext* aRenderingContext) {
  nscoord result = 0;
  DISPLAY_PREF_INLINE_SIZE(this, result);

  nsIFrame* inner = mFrames.FirstChild();
  result = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, inner,
                                                IntrinsicISizeType::PrefISize,
                                                nsLayoutUtils::IGNORE_PADDING);
  return result;
}

/* virtual */ nsIFrame::IntrinsicSizeOffsetData
nsTableCellFrame::IntrinsicISizeOffsets(nscoord aPercentageBasis) {
  IntrinsicSizeOffsetData result =
      nsContainerFrame::IntrinsicISizeOffsets(aPercentageBasis);

  result.margin = 0;

  WritingMode wm = GetWritingMode();
  result.border = GetBorderWidth(wm).IStartEnd(wm);

  return result;
}

#ifdef DEBUG
#  define PROBABLY_TOO_LARGE 1000000
static void DebugCheckChildSize(nsIFrame* aChild, ReflowOutput& aMet) {
  WritingMode wm = aMet.GetWritingMode();
  if ((aMet.ISize(wm) < 0) || (aMet.ISize(wm) > PROBABLY_TOO_LARGE)) {
    printf("WARNING: cell content %p has large inline size %d \n",
           static_cast<void*>(aChild), int32_t(aMet.ISize(wm)));
  }
}
#endif

// the computed bsize for the cell, which descendants use for percent bsize
// calculations it is the bsize (minus border, padding) of the cell's first in
// flow during its final reflow without an unconstrained bsize.
static nscoord CalcUnpaginatedBSize(nsTableCellFrame& aCellFrame,
                                    nsTableFrame& aTableFrame,
                                    nscoord aBlockDirBorderPadding) {
  const nsTableCellFrame* firstCellInFlow =
      static_cast<nsTableCellFrame*>(aCellFrame.FirstInFlow());
  nsTableFrame* firstTableInFlow =
      static_cast<nsTableFrame*>(aTableFrame.FirstInFlow());
  nsTableRowFrame* row =
      static_cast<nsTableRowFrame*>(firstCellInFlow->GetParent());
  nsTableRowGroupFrame* firstRGInFlow =
      static_cast<nsTableRowGroupFrame*>(row->GetParent());

  uint32_t rowIndex = firstCellInFlow->RowIndex();
  int32_t rowSpan = aTableFrame.GetEffectiveRowSpan(*firstCellInFlow);

  nscoord computedBSize =
      firstTableInFlow->GetRowSpacing(rowIndex, rowIndex + rowSpan - 1);
  computedBSize -= aBlockDirBorderPadding;
  uint32_t rowX;
  for (row = firstRGInFlow->GetFirstRow(), rowX = 0; row;
       row = row->GetNextRow(), rowX++) {
    if (rowX > rowIndex + rowSpan - 1) {
      break;
    } else if (rowX >= rowIndex) {
      computedBSize += row->GetUnpaginatedBSize();
    }
  }
  return computedBSize;
}

void nsTableCellFrame::Reflow(nsPresContext* aPresContext,
                              ReflowOutput& aDesiredSize,
                              const ReflowInput& aReflowInput,
                              nsReflowStatus& aStatus) {
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsTableCellFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

  if (aReflowInput.mFlags.mSpecialBSizeReflow) {
    FirstInFlow()->AddStateBits(NS_TABLE_CELL_HAD_SPECIAL_REFLOW);
  }

  // see if a special bsize reflow needs to occur due to having a pct height
  nsTableFrame::CheckRequestSpecialBSizeReflow(aReflowInput);

  WritingMode wm = aReflowInput.GetWritingMode();
  LogicalSize availSize = aReflowInput.AvailableSize();

  // @note |this| frame applies borders but not any padding.  Our anonymous
  // inner frame applies the padding (but not borders).
  LogicalMargin border = GetBorderWidth(wm);

  ReflowOutput kidSize(wm);
  SetPriorAvailISize(aReflowInput.AvailableISize());
  nsIFrame* firstKid = mFrames.FirstChild();
  NS_ASSERTION(
      firstKid,
      "Frame construction error, a table cell always has an inner cell frame");
  nsTableFrame* tableFrame = GetTableFrame();

  if (aReflowInput.mFlags.mSpecialBSizeReflow || aPresContext->IsPaginated()) {
    // Here, we're changing our own reflow input, so we need to account for our
    // padding, even though we don't apply it anywhere else, to get the correct
    // percentage resolution on children.
    const LogicalMargin bp = border + aReflowInput.ComputedLogicalPadding(wm);
    if (aReflowInput.mFlags.mSpecialBSizeReflow) {
      const_cast<ReflowInput&>(aReflowInput)
          .SetComputedBSize(BSize(wm) - bp.BStartEnd(wm));
      DISPLAY_REFLOW_CHANGE();
    } else {
      const nscoord computedUnpaginatedBSize =
          CalcUnpaginatedBSize(*this, *tableFrame, bp.BStartEnd(wm));
      if (computedUnpaginatedBSize > 0) {
        const_cast<ReflowInput&>(aReflowInput)
            .SetComputedBSize(computedUnpaginatedBSize);
        DISPLAY_REFLOW_CHANGE();
      }
    }
  }

  // We need to apply the skip sides for current fragmentainer's border after
  // we finish calculating the special block-size or unpaginated block-size to
  // prevent the skip sides from affecting the results.
  //
  // We assume we are the last fragment by using
  // PreReflowBlockLevelLogicalSkipSides(), i.e. the block-end border and
  // padding is not skipped.
  border.ApplySkipSides(PreReflowBlockLevelLogicalSkipSides());

  availSize.ISize(wm) -= border.IStartEnd(wm);

  // If we have a constrained available block-size, shrink it by subtracting our
  // block-direction border and padding for our children.
  if (NS_UNCONSTRAINEDSIZE != availSize.BSize(wm)) {
    availSize.BSize(wm) -= border.BStart(wm);

    if (aReflowInput.mStyleBorder->mBoxDecorationBreak ==
        StyleBoxDecorationBreak::Clone) {
      // We have box-decoration-break:clone. Subtract block-end border from the
      // available block-size as well.
      availSize.BSize(wm) -= border.BEnd(wm);
    }
  }

  // Available block-size can became negative after subtracting block-direction
  // border and padding. Per spec, to guarantee progress, fragmentainers are
  // assumed to have a minimum block size of 1px regardless of their used size.
  // https://drafts.csswg.org/css-break/#breaking-rules
  availSize.BSize(wm) =
      std::max(availSize.BSize(wm), nsPresContext::CSSPixelsToAppUnits(1));

  WritingMode kidWM = firstKid->GetWritingMode();
  ReflowInput kidReflowInput(aPresContext, aReflowInput, firstKid,
                             availSize.ConvertTo(kidWM, wm), Nothing(),
                             ReflowInput::InitFlag::CallerWillInit);
  // Override computed padding, in case it's percentage padding
  {
    const auto padding = aReflowInput.ComputedLogicalPadding(kidWM);
    kidReflowInput.Init(aPresContext, Nothing(), Nothing(), Some(padding));
    if (firstKid->IsScrollFrame()) {
      // Propagate explicit block sizes to our inner frame, if it's a scroll
      // frame.
      // Table cells don't respect box-sizing, so we need to remove the
      // padding, so that the scroll-frame sizes properly (since the
      // scrollbars also add to the padding area).
      auto ToScrolledBSize = [&](const nscoord aBSize) {
        return std::max(0, aBSize - padding.BStartEnd(kidWM));
      };
      if (aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE) {
        kidReflowInput.SetComputedBSize(
            ToScrolledBSize(aReflowInput.ComputedBSize()));
      }
      if (aReflowInput.ComputedMinBSize() > 0) {
        kidReflowInput.SetComputedMinBSize(
            ToScrolledBSize(aReflowInput.ComputedMinBSize()));
      }
      if (aReflowInput.ComputedMaxBSize() != NS_UNCONSTRAINEDSIZE) {
        kidReflowInput.SetComputedMaxBSize(
            ToScrolledBSize(aReflowInput.ComputedMaxBSize()));
      }
    }
  }

  // Don't be a percent height observer if we're in the middle of
  // special-bsize reflow, in case we get an accidental NotifyPercentBSize()
  // call (which we shouldn't honor during special-bsize reflow)
  if (!aReflowInput.mFlags.mSpecialBSizeReflow) {
    // mPercentBSizeObserver is for children of cells in quirks mode,
    // but only those than are tables in standards mode.  NeedsToObserve
    // will determine how far this is propagated to descendants.
    kidReflowInput.mPercentBSizeObserver = this;
  }
  // Don't propagate special bsize reflow input to our kids
  kidReflowInput.mFlags.mSpecialBSizeReflow = false;

  if (aReflowInput.mFlags.mSpecialBSizeReflow ||
      FirstInFlow()->HasAnyStateBits(NS_TABLE_CELL_HAD_SPECIAL_REFLOW)) {
    // We need to force the kid to have mBResize set if we've had a
    // special reflow in the past, since the non-special reflow needs to
    // resize back to what it was without the special bsize reflow.
    kidReflowInput.SetBResize(true);
  }

  nsSize containerSize = aReflowInput.ComputedSizeAsContainerIfConstrained();

  const LogicalPoint kidOrigin = border.StartOffset(wm);
  const nsRect origRect = firstKid->GetRect();
  const nsRect origInkOverflow = firstKid->InkOverflowRect();
  const bool firstReflow = firstKid->HasAnyStateBits(NS_FRAME_FIRST_REFLOW);

  ReflowChild(firstKid, aPresContext, kidSize, kidReflowInput, wm, kidOrigin,
              containerSize, ReflowChildFlags::Default, aStatus);
  if (aStatus.IsOverflowIncomplete()) {
    // Don't pass OVERFLOW_INCOMPLETE through tables until they can actually
    // handle it
    // XXX should paginate overflow as overflow, but not in this patch (bug
    // 379349)
    aStatus.SetIncomplete();
    NS_WARNING(nsPrintfCString("Set table cell incomplete %p", this).get());
  }

  // XXXbz is this invalidate actually needed, really?
  if (HasAnyStateBits(NS_FRAME_IS_DIRTY)) {
    InvalidateFrameSubtree();
  }

#ifdef DEBUG
  DebugCheckChildSize(firstKid, kidSize);
#endif

  // Place the child
  FinishReflowChild(firstKid, aPresContext, kidSize, &kidReflowInput, wm,
                    kidOrigin, containerSize, ReflowChildFlags::Default);

  {
    nsIFrame* prevInFlow = GetPrevInFlow();
    const bool isEmpty =
        prevInFlow
            ? static_cast<nsTableCellFrame*>(prevInFlow)->GetContentEmpty()
            : !CellHasVisibleContent(tableFrame, this);
    SetContentEmpty(isEmpty);
  }

  if (tableFrame->IsBorderCollapse()) {
    nsTableFrame::InvalidateTableFrame(firstKid, origRect, origInkOverflow,
                                       firstReflow);
  }
  // first, compute the bsize which can be set w/o being restricted by
  // available bsize
  LogicalSize cellSize(wm);
  cellSize.BSize(wm) = kidSize.BSize(wm);

  if (NS_UNCONSTRAINEDSIZE != cellSize.BSize(wm)) {
    cellSize.BSize(wm) += border.BStart(wm);

    if (aStatus.IsComplete() ||
        aReflowInput.mStyleBorder->mBoxDecorationBreak ==
            StyleBoxDecorationBreak::Clone) {
      cellSize.BSize(wm) += border.BEnd(wm);
    }
  }

  // next determine the cell's isize. At this point, we've factored in the
  // cell's style attributes.
  cellSize.ISize(wm) = kidSize.ISize(wm);

  // factor in border (and disregard padding, which is handled by our child).
  if (NS_UNCONSTRAINEDSIZE != cellSize.ISize(wm)) {
    cellSize.ISize(wm) += border.IStartEnd(wm);
  }

  // set the cell's desired size and max element size
  aDesiredSize.SetSize(wm, cellSize);

  // the overflow area will be computed when BlockDirAlignChild() gets called

  if (aReflowInput.mFlags.mSpecialBSizeReflow &&
      NS_UNCONSTRAINEDSIZE == aReflowInput.AvailableBSize()) {
    aDesiredSize.BSize(wm) = BSize(wm);
  }

  // If our parent is in initial reflow, it'll handle invalidating our
  // entire overflow rect.
  if (!GetParent()->HasAnyStateBits(NS_FRAME_FIRST_REFLOW) &&
      nsSize(aDesiredSize.Width(), aDesiredSize.Height()) != mRect.Size()) {
    InvalidateFrame();
  }

  // remember the desired size for this reflow
  SetDesiredSize(aDesiredSize);

  // Any absolutely-positioned children will get reflowed in
  // nsIFrame::FixupPositionedTableParts in another pass, so propagate our
  // dirtiness to them before our parent clears our dirty bits.
  PushDirtyBitToAbsoluteFrames();
}

/* ----- global methods ----- */

NS_QUERYFRAME_HEAD(nsTableCellFrame)
  NS_QUERYFRAME_ENTRY(nsTableCellFrame)
  NS_QUERYFRAME_ENTRY(nsITableCellLayout)
  NS_QUERYFRAME_ENTRY(nsIPercentBSizeObserver)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)

#ifdef ACCESSIBILITY
a11y::AccType nsTableCellFrame::AccessibleType() {
  return a11y::eHTMLTableCellType;
}
#endif

/* This is primarily for editor access via nsITableLayout */
NS_IMETHODIMP
nsTableCellFrame::GetCellIndexes(int32_t& aRowIndex, int32_t& aColIndex) {
  aRowIndex = RowIndex();
  aColIndex = mColIndex;
  return NS_OK;
}

nsTableCellFrame* NS_NewTableCellFrame(PresShell* aPresShell,
                                       ComputedStyle* aStyle,
                                       nsTableFrame* aTableFrame) {
  if (aTableFrame->IsBorderCollapse())
    return new (aPresShell) nsBCTableCellFrame(aStyle, aTableFrame);
  else
    return new (aPresShell) nsTableCellFrame(aStyle, aTableFrame);
}

NS_IMPL_FRAMEARENA_HELPERS(nsBCTableCellFrame)

LogicalMargin nsTableCellFrame::GetBorderWidth(WritingMode aWM) const {
  return LogicalMargin(aWM, StyleBorder()->GetComputedBorder());
}

void nsTableCellFrame::AppendDirectlyOwnedAnonBoxes(
    nsTArray<OwnedAnonBox>& aResult) {
  nsIFrame* kid = mFrames.FirstChild();
  MOZ_ASSERT(kid && !kid->GetNextSibling(),
             "Table cells should have just one child");
  aResult.AppendElement(OwnedAnonBox(kid));
}

#ifdef DEBUG_FRAME_DUMP
nsresult nsTableCellFrame::GetFrameName(nsAString& aResult) const {
  return MakeFrameName(u"TableCell"_ns, aResult);
}
#endif

// nsBCTableCellFrame

nsBCTableCellFrame::nsBCTableCellFrame(ComputedStyle* aStyle,
                                       nsTableFrame* aTableFrame)
    : nsTableCellFrame(aStyle, aTableFrame, kClassID) {
  mBStartBorder = mIEndBorder = mBEndBorder = mIStartBorder = 0;
}

nsBCTableCellFrame::~nsBCTableCellFrame() = default;

/* virtual */
nsMargin nsBCTableCellFrame::GetUsedBorder() const {
  WritingMode wm = GetWritingMode();
  return GetBorderWidth(wm).GetPhysicalMargin(wm);
}

#ifdef DEBUG_FRAME_DUMP
nsresult nsBCTableCellFrame::GetFrameName(nsAString& aResult) const {
  return MakeFrameName(u"BCTableCell"_ns, aResult);
}
#endif

LogicalMargin nsBCTableCellFrame::GetBorderWidth(WritingMode aWM) const {
  int32_t d2a = PresContext()->AppUnitsPerDevPixel();
  return LogicalMargin(aWM, BC_BORDER_END_HALF_COORD(d2a, mBStartBorder),
                       BC_BORDER_START_HALF_COORD(d2a, mIEndBorder),
                       BC_BORDER_START_HALF_COORD(d2a, mBEndBorder),
                       BC_BORDER_END_HALF_COORD(d2a, mIStartBorder));
}

BCPixelSize nsBCTableCellFrame::GetBorderWidth(LogicalSide aSide) const {
  switch (aSide) {
    case eLogicalSideBStart:
      return BC_BORDER_END_HALF(mBStartBorder);
    case eLogicalSideIEnd:
      return BC_BORDER_START_HALF(mIEndBorder);
    case eLogicalSideBEnd:
      return BC_BORDER_START_HALF(mBEndBorder);
    default:
      return BC_BORDER_END_HALF(mIStartBorder);
  }
}

void nsBCTableCellFrame::SetBorderWidth(LogicalSide aSide, BCPixelSize aValue) {
  switch (aSide) {
    case eLogicalSideBStart:
      mBStartBorder = aValue;
      break;
    case eLogicalSideIEnd:
      mIEndBorder = aValue;
      break;
    case eLogicalSideBEnd:
      mBEndBorder = aValue;
      break;
    default:
      mIStartBorder = aValue;
  }
}

/* virtual */
nsMargin nsBCTableCellFrame::GetBorderOverflow() {
  WritingMode wm = GetWritingMode();
  int32_t d2a = PresContext()->AppUnitsPerDevPixel();
  LogicalMargin halfBorder(wm, BC_BORDER_START_HALF_COORD(d2a, mBStartBorder),
                           BC_BORDER_END_HALF_COORD(d2a, mIEndBorder),
                           BC_BORDER_END_HALF_COORD(d2a, mBEndBorder),
                           BC_BORDER_START_HALF_COORD(d2a, mIStartBorder));
  return halfBorder.GetPhysicalMargin(wm);
}

namespace mozilla {

class nsDisplayTableCellSelection final : public nsPaintedDisplayItem {
 public:
  nsDisplayTableCellSelection(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
      : nsPaintedDisplayItem(aBuilder, aFrame) {
    MOZ_COUNT_CTOR(nsDisplayTableCellSelection);
  }
  MOZ_COUNTED_DTOR_OVERRIDE(nsDisplayTableCellSelection)

  void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override {
    static_cast<nsTableCellFrame*>(mFrame)->DecorateForSelection(
        aCtx->GetDrawTarget(), ToReferenceFrame());
  }
  NS_DISPLAY_DECL_NAME("TableCellSelection", TYPE_TABLE_CELL_SELECTION)

  bool CreateWebRenderCommands(
      mozilla::wr::DisplayListBuilder& aBuilder,
      mozilla::wr::IpcResourceUpdateQueue& aResources,
      const StackingContextHelper& aSc,
      mozilla::layers::RenderRootStateManager* aManager,
      nsDisplayListBuilder* aDisplayListBuilder) override {
    RefPtr<nsFrameSelection> frameSelection =
        mFrame->PresShell()->FrameSelection();
    return !frameSelection->IsInTableSelectionMode();
  }
};

}  // namespace mozilla

void nsTableCellFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                        const nsDisplayListSet& aLists) {
  DO_GLOBAL_REFLOW_COUNT_DSP("nsTableCellFrame");
  if (ShouldPaintBordersAndBackgrounds()) {
    // display outset box-shadows if we need to.
    bool hasBoxShadow = !StyleEffects()->mBoxShadow.IsEmpty();
    if (hasBoxShadow) {
      aLists.BorderBackground()->AppendNewToTop<nsDisplayBoxShadowOuter>(
          aBuilder, this);
    }

    nsRect bgRect = GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(this);
    nsRect bgRectInsideBorder = bgRect;

    // If we're doing collapsed borders, and this element forms a new stacking
    // context or has position:relative (which paints as though it did), inset
    // the background rect so that we don't overpaint the inset part of our
    // borders.
    nsTableFrame* tableFrame = GetTableFrame();
    if (tableFrame->IsBorderCollapse() &&
        (IsStackingContext() ||
         StyleDisplay()->mPosition == StylePositionProperty::Relative)) {
      bgRectInsideBorder.Deflate(GetUsedBorder());
    }

    // display background if we need to.
    const AppendedBackgroundType result =
        nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
            aBuilder, this, bgRectInsideBorder, aLists.BorderBackground(), true,
            bgRect);
    if (result == AppendedBackgroundType::None) {
      aBuilder->BuildCompositorHitTestInfoIfNeeded(this,
                                                   aLists.BorderBackground());
    }

    // display inset box-shadows if we need to.
    if (hasBoxShadow) {
      aLists.BorderBackground()->AppendNewToTop<nsDisplayBoxShadowInner>(
          aBuilder, this);
    }

    // display borders if we need to
    ProcessBorders(tableFrame, aBuilder, aLists);

    // and display the selection border if we need to
    if (IsSelected()) {
      aLists.BorderBackground()->AppendNewToTop<nsDisplayTableCellSelection>(
          aBuilder, this);
    }

    // This can be null if display list building initiated in the middle
    // of the table, which can happen with background-clip:text and
    // -moz-element.
    nsDisplayTableBackgroundSet* backgrounds =
        aBuilder->GetTableBackgroundSet();
    if (backgrounds) {
      // Compute bgRect relative to reference frame, but using the
      // normal (without position:relative offsets) positions for the
      // cell, row and row group.
      bgRect = GetRectRelativeToSelf() + GetNormalPosition();

      nsTableRowFrame* row = GetTableRowFrame();
      bgRect += row->GetNormalPosition();

      nsTableRowGroupFrame* rowGroup = row->GetTableRowGroupFrame();
      bgRect += rowGroup->GetNormalPosition();

      bgRect += backgrounds->TableToReferenceFrame();

      DisplayListClipState::AutoSaveRestore clipState(aBuilder);
      nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter asrSetter(
          aBuilder);
      if (IsStackingContext() || row->IsStackingContext() ||
          rowGroup->IsStackingContext() || tableFrame->IsStackingContext()) {
        // The col/colgroup items we create below will be inserted directly into
        // the BorderBackgrounds list of the table frame. That means that
        // they'll be moved *outside* of any wrapper items created for any
        // frames between this table cell frame and the table wrapper frame, and
        // will not participate in those frames's opacity / transform / filter /
        // mask effects. If one of those frames is a stacking context, then we
        // may have one or more of those wrapper items, and one of them may have
        // captured a clip. In order to ensure correct clipping and scrolling of
        // the col/colgroup items, restore the clip and ASR that we observed
        // when we entered the table frame. If that frame is a stacking context
        // but doesn't have any clip capturing wrapper items, then we'll
        // double-apply the clip. That's ok.
        clipState.SetClipChainForContainingBlockDescendants(
            backgrounds->GetTableClipChain());
        asrSetter.SetCurrentActiveScrolledRoot(backgrounds->GetTableASR());
      }

      // Create backgrounds items as needed for the column and column
      // group that this cell occupies.
      nsTableColFrame* col = backgrounds->GetColForIndex(ColIndex());
      nsTableColGroupFrame* colGroup = col->GetTableColGroupFrame();

      Maybe<nsDisplayListBuilder::AutoBuildingDisplayList> buildingForColGroup;
      nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
          aBuilder, colGroup, bgRect, backgrounds->ColGroupBackgrounds(), false,
          colGroup->GetRect() + backgrounds->TableToReferenceFrame(), this,
          &buildingForColGroup);

      Maybe<nsDisplayListBuilder::AutoBuildingDisplayList> buildingForCol;
      nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
          aBuilder, col, bgRect, backgrounds->ColBackgrounds(), false,
          col->GetRect() + colGroup->GetPosition() +
              backgrounds->TableToReferenceFrame(),
          this, &buildingForCol);
    }
  }

  // the 'empty-cells' property has no effect on 'outline'
  DisplayOutline(aBuilder, aLists);

  nsIFrame* kid = mFrames.FirstChild();
  NS_ASSERTION(kid && !kid->GetNextSibling(),
               "Table cells should have just one child");
  // The child's background will go in our BorderBackground() list.
  // This isn't a problem since it won't have a real background except for
  // event handling. We do not call BuildDisplayListForNonBlockChildren
  // because that/ would put the child's background in the Content() list
  // which isn't right (e.g., would end up on top of our child floats for
  // event handling).
  BuildDisplayListForChild(aBuilder, kid, aLists);
}