summaryrefslogtreecommitdiff
path: root/layout/tables/nsTableRowFrame.cpp
blob: 374bb2562e73e6a0f4ab6bf605eede50285fe702 (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
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
/* -*- 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 "mozilla/Maybe.h"

#include "nsTableRowFrame.h"
#include "nsTableRowGroupFrame.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsTableFrame.h"
#include "nsTableCellFrame.h"
#include "nsCSSRendering.h"
#include "nsHTMLParts.h"
#include "nsTableColGroupFrame.h"
#include "nsTableColFrame.h"
#include "nsCOMPtr.h"
#include "nsDisplayList.h"
#include "nsIFrameInlines.h"
#include <algorithm>

using namespace mozilla;

namespace mozilla {

struct TableCellReflowInput : public ReflowInput
{
  TableCellReflowInput(nsPresContext*           aPresContext,
                         const ReflowInput& aParentReflowInput,
                         nsIFrame*                aFrame,
                         const LogicalSize&       aAvailableSpace,
                         uint32_t                 aFlags = 0)
    : ReflowInput(aPresContext, aParentReflowInput, aFrame,
                        aAvailableSpace, nullptr, aFlags)
  {
  }

  void FixUp(const LogicalSize& aAvailSpace);
};

} // namespace mozilla

void TableCellReflowInput::FixUp(const LogicalSize& aAvailSpace)
{
  // fix the mComputed values during a pass 2 reflow since the cell can be a percentage base
  NS_WARNING_ASSERTION(
    NS_UNCONSTRAINEDSIZE != aAvailSpace.ISize(mWritingMode),
    "have unconstrained inline-size; this should only result from very large "
    "sizes, not attempts at intrinsic inline size calculation");
  if (NS_UNCONSTRAINEDSIZE != ComputedISize()) {
    nscoord computedISize = aAvailSpace.ISize(mWritingMode) -
      ComputedLogicalBorderPadding().IStartEnd(mWritingMode);
    computedISize = std::max(0, computedISize);
    SetComputedISize(computedISize);
  }
  if (NS_UNCONSTRAINEDSIZE != ComputedBSize() &&
      NS_UNCONSTRAINEDSIZE != aAvailSpace.BSize(mWritingMode)) {
    nscoord computedBSize = aAvailSpace.BSize(mWritingMode) -
      ComputedLogicalBorderPadding().BStartEnd(mWritingMode);
    computedBSize = std::max(0, computedBSize);
    SetComputedBSize(computedBSize);
  }
}

void
nsTableRowFrame::InitChildReflowInput(nsPresContext&          aPresContext,
                                      const LogicalSize&      aAvailSize,
                                      bool                    aBorderCollapse,
                                      TableCellReflowInput& aReflowInput)
{
  nsMargin collapseBorder;
  nsMargin* pCollapseBorder = nullptr;
  if (aBorderCollapse) {
    // we only reflow cells, so don't need to check frame type
    nsBCTableCellFrame* bcCellFrame = (nsBCTableCellFrame*)aReflowInput.mFrame;
    if (bcCellFrame) {
      WritingMode wm = GetWritingMode();
      collapseBorder = bcCellFrame->GetBorderWidth(wm).GetPhysicalMargin(wm);
      pCollapseBorder = &collapseBorder;
    }
  }
  aReflowInput.Init(&aPresContext, nullptr, pCollapseBorder);
  aReflowInput.FixUp(aAvailSize);
}

void
nsTableRowFrame::SetFixedBSize(nscoord aValue)
{
  nscoord bsize = std::max(0, aValue);
  if (HasFixedBSize()) {
    if (bsize > mStyleFixedBSize) {
      mStyleFixedBSize = bsize;
    }
  }
  else {
    mStyleFixedBSize = bsize;
    if (bsize > 0) {
      SetHasFixedBSize(true);
    }
  }
}

void
nsTableRowFrame::SetPctBSize(float aPctValue,
                             bool  aForce)
{
  nscoord bsize = std::max(0, NSToCoordRound(aPctValue * 100.0f));
  if (HasPctBSize()) {
    if ((bsize > mStylePctBSize) || aForce) {
      mStylePctBSize = bsize;
    }
  }
  else {
    mStylePctBSize = bsize;
    if (bsize > 0) {
      SetHasPctBSize(true);
    }
  }
}

/* ----------- nsTableRowFrame ---------- */

NS_QUERYFRAME_HEAD(nsTableRowFrame)
  NS_QUERYFRAME_ENTRY(nsTableRowFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)

nsTableRowFrame::nsTableRowFrame(nsStyleContext* aContext)
  : nsContainerFrame(aContext)
{
  mBits.mRowIndex = mBits.mFirstInserted = 0;
  ResetBSize(0);
}

nsTableRowFrame::~nsTableRowFrame()
{
}

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

  NS_ASSERTION(mozilla::StyleDisplay::TableRow == StyleDisplay()->mDisplay,
               "wrong display on table row frame");

  if (aPrevInFlow) {
    // Set the row index
    nsTableRowFrame* rowFrame = (nsTableRowFrame*)aPrevInFlow;

    SetRowIndex(rowFrame->GetRowIndex());
  }
}

void
nsTableRowFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
  if (HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
    nsTableFrame::UnregisterPositionedTablePart(this, aDestructRoot);
  }

  nsContainerFrame::DestroyFrom(aDestructRoot);
}

/* virtual */ void
nsTableRowFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
{
  nsContainerFrame::DidSetStyleContext(aOldStyleContext);

  if (!aOldStyleContext) //avoid this on init
    return;

  nsTableFrame* tableFrame = GetTableFrame();
  if (tableFrame->IsBorderCollapse() &&
      tableFrame->BCRecalcNeeded(aOldStyleContext, StyleContext())) {
    TableArea damageArea(0, GetRowIndex(), tableFrame->GetColCount(), 1);
    tableFrame->AddBCDamageArea(damageArea);
  }
}

void
nsTableRowFrame::AppendFrames(ChildListID  aListID,
                              nsFrameList& aFrameList)
{
  NS_ASSERTION(aListID == kPrincipalList, "unexpected child list");

  DrainSelfOverflowList(); // ensure the last frame is in mFrames
  const nsFrameList::Slice& newCells = mFrames.AppendFrames(nullptr, aFrameList);

  // Add the new cell frames to the table
  nsTableFrame* tableFrame = GetTableFrame();
  for (nsFrameList::Enumerator e(newCells) ; !e.AtEnd(); e.Next()) {
    nsIFrame *childFrame = e.get();
    NS_ASSERTION(IS_TABLE_CELL(childFrame->GetType()),
                 "Not a table cell frame/pseudo frame construction failure");
    tableFrame->AppendCell(static_cast<nsTableCellFrame&>(*childFrame), GetRowIndex());
  }

  PresContext()->PresShell()->FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                                               NS_FRAME_HAS_DIRTY_CHILDREN);
  tableFrame->SetGeometryDirty();
}


void
nsTableRowFrame::InsertFrames(ChildListID  aListID,
                              nsIFrame*    aPrevFrame,
                              nsFrameList& aFrameList)
{
  NS_ASSERTION(aListID == kPrincipalList, "unexpected child list");
  NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
               "inserting after sibling frame with different parent");
  DrainSelfOverflowList(); // ensure aPrevFrame is in mFrames
  //Insert Frames in the frame list
  const nsFrameList::Slice& newCells = mFrames.InsertFrames(nullptr, aPrevFrame, aFrameList);

  // Get the table frame
  nsTableFrame* tableFrame = GetTableFrame();
  nsIAtom* cellFrameType = tableFrame->IsBorderCollapse() ? nsGkAtoms::bcTableCellFrame : nsGkAtoms::tableCellFrame;
  nsTableCellFrame* prevCellFrame = (nsTableCellFrame *)nsTableFrame::GetFrameAtOrBefore(this, aPrevFrame, cellFrameType);
  nsTArray<nsTableCellFrame*> cellChildren;
  for (nsFrameList::Enumerator e(newCells); !e.AtEnd(); e.Next()) {
    nsIFrame *childFrame = e.get();
    NS_ASSERTION(IS_TABLE_CELL(childFrame->GetType()),
                 "Not a table cell frame/pseudo frame construction failure");
    cellChildren.AppendElement(static_cast<nsTableCellFrame*>(childFrame));
  }
  // insert the cells into the cell map
  int32_t colIndex = -1;
  if (prevCellFrame) {
    colIndex = prevCellFrame->ColIndex();
  }
  tableFrame->InsertCells(cellChildren, GetRowIndex(), colIndex);

  PresContext()->PresShell()->FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                                               NS_FRAME_HAS_DIRTY_CHILDREN);
  tableFrame->SetGeometryDirty();
}

void
nsTableRowFrame::RemoveFrame(ChildListID aListID,
                             nsIFrame*   aOldFrame)
{
  NS_ASSERTION(aListID == kPrincipalList, "unexpected child list");

  MOZ_ASSERT((nsTableCellFrame*)do_QueryFrame(aOldFrame));
  nsTableCellFrame* cellFrame = static_cast<nsTableCellFrame*>(aOldFrame);
  // remove the cell from the cell map
  nsTableFrame* tableFrame = GetTableFrame();
  tableFrame->RemoveCell(cellFrame, GetRowIndex());

  // Remove the frame and destroy it
  mFrames.DestroyFrame(aOldFrame);

  PresContext()->PresShell()->
    FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                     NS_FRAME_HAS_DIRTY_CHILDREN);

  tableFrame->SetGeometryDirty();
}

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

/* virtual */ nsMargin
nsTableRowFrame::GetUsedBorder() const
{
  return nsMargin(0,0,0,0);
}

/* virtual */ nsMargin
nsTableRowFrame::GetUsedPadding() const
{
  return nsMargin(0,0,0,0);
}

nscoord
GetBSizeOfRowsSpannedBelowFirst(nsTableCellFrame& aTableCellFrame,
                                nsTableFrame&     aTableFrame,
                                const WritingMode aWM)
{
  nscoord bsize = 0;
  int32_t rowSpan = aTableFrame.GetEffectiveRowSpan(aTableCellFrame);
  // add in bsize of rows spanned beyond the 1st one
  nsIFrame* nextRow = aTableCellFrame.GetParent()->GetNextSibling();
  for (int32_t rowX = 1; ((rowX < rowSpan) && nextRow);) {
    if (nsGkAtoms::tableRowFrame == nextRow->GetType()) {
      bsize += nextRow->BSize(aWM);
      rowX++;
    }
    bsize += aTableFrame.GetRowSpacing(rowX);
    nextRow = nextRow->GetNextSibling();
  }
  return bsize;
}

/**
 * Post-reflow hook. This is where the table row does its post-processing
 */
void
nsTableRowFrame::DidResize()
{
  // Resize and re-align the cell frames based on our row bsize
  nsTableFrame* tableFrame = GetTableFrame();

  WritingMode wm = GetWritingMode();
  ReflowOutput desiredSize(wm);
  desiredSize.SetSize(wm, GetLogicalSize(wm));
  desiredSize.SetOverflowAreasToDesiredBounds();

  nsSize containerSize = mRect.Size();

  for (nsIFrame* childFrame : mFrames) {
    nsTableCellFrame *cellFrame = do_QueryFrame(childFrame);
    if (cellFrame) {
      nscoord cellBSize = BSize(wm) +
        GetBSizeOfRowsSpannedBelowFirst(*cellFrame, *tableFrame, wm);

      // If the bsize for the cell has changed, we need to reset it;
      // and in vertical-rl mode, we need to update the cell's block position
      // to account for the containerSize, which may not have been known
      // earlier, so we always apply it here.
      LogicalSize cellSize = cellFrame->GetLogicalSize(wm);
      if (cellSize.BSize(wm) != cellBSize || wm.IsVerticalRL()) {
        nsRect cellOldRect = cellFrame->GetRect();
        nsRect cellVisualOverflow = cellFrame->GetVisualOverflowRect();

        if (wm.IsVerticalRL()) {
          // Get the old position of the cell, as we want to preserve its
          // inline coordinate.
          LogicalPoint oldPos =
            cellFrame->GetLogicalPosition(wm, containerSize);

          // The cell should normally be aligned with the row's block-start,
          // so set the B component of the position to zero:
          LogicalPoint newPos(wm, oldPos.I(wm), 0);

          // ...unless relative positioning is in effect, in which case the
          // cell may have been moved away from the row's block-start
          if (cellFrame->IsRelativelyPositioned()) {
            // Find out where the cell would have been without relative
            // positioning.
            LogicalPoint oldNormalPos =
              cellFrame->GetLogicalNormalPosition(wm, containerSize);
            // The difference (if any) between oldPos and oldNormalPos reflects
            // relative positioning that was applied to the cell, and which we
            // need to incorporate when resetting the position.
            newPos.B(wm) = oldPos.B(wm) - oldNormalPos.B(wm);
          }

          if (oldPos != newPos) {
            cellFrame->SetPosition(wm, newPos, containerSize);
            nsTableFrame::RePositionViews(cellFrame);
          }
        }

        cellSize.BSize(wm) = cellBSize;
        cellFrame->SetSize(wm, cellSize);
        nsTableFrame::InvalidateTableFrame(cellFrame, cellOldRect,
                                           cellVisualOverflow,
                                           false);
      }

      // realign cell content based on the new bsize.  We might be able to
      // skip this if the bsize didn't change... maybe.  Hard to tell.
      cellFrame->BlockDirAlignChild(wm, mMaxCellAscent);

      // Always store the overflow, even if the height didn't change, since
      // we'll lose part of our overflow area otherwise.
      ConsiderChildOverflow(desiredSize.mOverflowAreas, cellFrame);

      // Note that if the cell's *content* needs to change in response
      // to this height, it will get a special bsize reflow.
    }
  }
  FinishAndStoreOverflow(&desiredSize);
  if (HasView()) {
    nsContainerFrame::SyncFrameViewAfterReflow(PresContext(), this, GetView(),
                                               desiredSize.VisualOverflow(),
                                               ReflowChildFlags::Default);
  }
  // Let our base class do the usual work
}

// returns max-ascent amongst all cells that have 'vertical-align: baseline'
// *including* cells with rowspans
nscoord nsTableRowFrame::GetMaxCellAscent() const
{
  return mMaxCellAscent;
}

nscoord nsTableRowFrame::GetRowBaseline(WritingMode aWM)
{
  if (mMaxCellAscent) {
    return mMaxCellAscent;
  }

  // If we don't have a baseline on any of the cells we go for the lowest
  // content edge of the inner block frames.
  // Every table cell has a cell frame with its border and padding. Inside
  // the cell is a block frame. The cell is as high as the tallest cell in
  // the parent row. As a consequence the block frame might not touch both
  // the top and the bottom padding of it parent cell frame at the same time.
  //
  // bbbbbbbbbbbbbbbbbb             cell border:  b
  // bppppppppppppppppb             cell padding: p
  // bpxxxxxxxxxxxxxxpb             inner block:  x
  // bpx            xpb
  // bpx            xpb
  // bpx            xpb
  // bpxxxxxxxxxxxxxxpb  base line
  // bp              pb
  // bp              pb
  // bppppppppppppppppb
  // bbbbbbbbbbbbbbbbbb

  nscoord ascent = 0;
  nsSize containerSize = GetSize();
  for (nsIFrame* childFrame : mFrames) {
    if (IS_TABLE_CELL(childFrame->GetType())) {
      nsIFrame* firstKid = childFrame->PrincipalChildList().FirstChild();
      ascent = std::max(ascent,
                        LogicalRect(aWM, firstKid->GetNormalRect(),
                                    containerSize).BEnd(aWM));
    }
  }
  return ascent;
}

nscoord
nsTableRowFrame::GetInitialBSize(nscoord aPctBasis) const
{
  nscoord bsize = 0;
  if ((aPctBasis > 0) && HasPctBSize()) {
    bsize = NSToCoordRound(GetPctBSize() * (float)aPctBasis);
  }
  if (HasFixedBSize()) {
    bsize = std::max(bsize, GetFixedBSize());
  }
  return std::max(bsize, GetContentBSize());
}

void
nsTableRowFrame::ResetBSize(nscoord aFixedBSize)
{
  SetHasFixedBSize(false);
  SetHasPctBSize(false);
  SetFixedBSize(0);
  SetPctBSize(0);
  SetContentBSize(0);

  if (aFixedBSize > 0) {
    SetFixedBSize(aFixedBSize);
  }

  mMaxCellAscent = 0;
  mMaxCellDescent = 0;
}

void
nsTableRowFrame::UpdateBSize(nscoord           aBSize,
                             nscoord           aAscent,
                             nscoord           aDescent,
                             nsTableFrame*     aTableFrame,
                             nsTableCellFrame* aCellFrame)
{
  if (!aTableFrame || !aCellFrame) {
    NS_ASSERTION(false , "invalid call");
    return;
  }

  if (aBSize != NS_UNCONSTRAINEDSIZE) {
    if (!(aCellFrame->HasVerticalAlignBaseline())) { // only the cell's height matters
      if (GetInitialBSize() < aBSize) {
        int32_t rowSpan = aTableFrame->GetEffectiveRowSpan(*aCellFrame);
        if (rowSpan == 1) {
          SetContentBSize(aBSize);
        }
      }
    }
    else { // the alignment on the baseline can change the bsize
      NS_ASSERTION((aAscent != NS_UNCONSTRAINEDSIZE) &&
                   (aDescent != NS_UNCONSTRAINEDSIZE), "invalid call");
      // see if this is a long ascender
      if (mMaxCellAscent < aAscent) {
        mMaxCellAscent = aAscent;
      }
      // see if this is a long descender and without rowspan
      if (mMaxCellDescent < aDescent) {
        int32_t rowSpan = aTableFrame->GetEffectiveRowSpan(*aCellFrame);
        if (rowSpan == 1) {
          mMaxCellDescent = aDescent;
        }
      }
      // keep the tallest bsize in sync
      if (GetInitialBSize() < mMaxCellAscent + mMaxCellDescent) {
        SetContentBSize(mMaxCellAscent + mMaxCellDescent);
      }
    }
  }
}

nscoord
nsTableRowFrame::CalcBSize(const ReflowInput& aReflowInput)
{
  nsTableFrame* tableFrame = GetTableFrame();
  nscoord computedBSize = (NS_UNCONSTRAINEDSIZE == aReflowInput.ComputedBSize())
                            ? 0 : aReflowInput.ComputedBSize();
  ResetBSize(computedBSize);

  WritingMode wm = aReflowInput.GetWritingMode();
  const nsStylePosition* position = StylePosition();
  const nsStyleCoord& bsizeStyleCoord = position->BSize(wm);
  if (bsizeStyleCoord.ConvertsToLength()) {
    SetFixedBSize(nsRuleNode::ComputeCoordPercentCalc(bsizeStyleCoord, 0));
  }
  else if (eStyleUnit_Percent == bsizeStyleCoord.GetUnit()) {
    SetPctBSize(bsizeStyleCoord.GetPercentValue());
  }
  // calc() with percentages is treated like 'auto' on table rows.

  for (nsIFrame* kidFrame : mFrames) {
    nsTableCellFrame *cellFrame = do_QueryFrame(kidFrame);
    if (cellFrame) {
      MOZ_ASSERT(cellFrame->GetWritingMode() == wm);
      LogicalSize desSize = cellFrame->GetDesiredSize();
      if ((NS_UNCONSTRAINEDSIZE == aReflowInput.AvailableBSize()) && !GetPrevInFlow()) {
        CalculateCellActualBSize(cellFrame, desSize.BSize(wm), wm);
      }
      // bsize may have changed, adjust descent to absorb any excess difference
      nscoord ascent;
       if (!kidFrame->PrincipalChildList().FirstChild()->PrincipalChildList().FirstChild())
         ascent = desSize.BSize(wm);
       else
         ascent = cellFrame->GetCellBaseline();
       nscoord descent = desSize.BSize(wm) - ascent;
       UpdateBSize(desSize.BSize(wm), ascent, descent, tableFrame, cellFrame);
    }
  }
  return GetInitialBSize();
}

void nsTableRowFrame::PaintCellBackgroundsForFrame(
    nsIFrame* aFrame, nsDisplayListBuilder* aBuilder,
    const nsDisplayListSet& aLists, const nsPoint& aOffset) {
  // Compute background rect by iterating all cell frame.
  const nsPoint toReferenceFrame = aBuilder->ToReferenceFrame(aFrame);
  for (nsTableCellFrame* cell = GetFirstCell(); cell;
       cell = cell->GetNextCell()) {
    if (!cell->ShouldPaintBackground(aBuilder)) {
      continue;
    }

    auto cellRect =
        cell->GetRectRelativeToSelf() + cell->GetNormalPosition() + aOffset;
    if (!aBuilder->GetDirtyRect().Intersects(cellRect)) {
      continue;
    }
    cellRect += toReferenceFrame;
    nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
        aBuilder, aFrame, cellRect, aLists.BorderBackground(), true, nullptr,
        aFrame->GetRectRelativeToSelf() + toReferenceFrame, cell);
  }
}

void
nsTableRowFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                  const nsDisplayListSet& aLists)
{
  if (IsVisibleForPainting(aBuilder)) {
    // XXXbz should box-shadow for rows/rowgroups/columns/colgroups get painted
    // just because we're visible?  Or should it depend on the cell visibility
    // when we're not the whole table?

    // Paint the outset box-shadows for the table frames
    if (StyleEffects()->mBoxShadow) {
      aLists.BorderBackground()->AppendNewToTop(
        new (aBuilder) nsDisplayBoxShadowOuter
          (aBuilder, this));
    }
  }

  PaintCellBackgroundsForFrame(this, aBuilder, aLists);

  if (IsVisibleForPainting(aBuilder)) {
    // XXXbz should box-shadow for rows/rowgroups/columns/colgroups get painted
    // just because we're visible?  Or should it depend on the cell visibility
    // when we're not the whole table?

    // Paint the inset box-shadows for the table frames
    if (StyleEffects()->mBoxShadow) {
      aLists.BorderBackground()->AppendNewToTop(
        new (aBuilder) nsDisplayBoxShadowInner
          (aBuilder, this));
    }
  }

  DisplayOutline(aBuilder, aLists);

  for (nsIFrame* kid : PrincipalChildList()) {
    BuildDisplayListForChild(aBuilder, kid, aLists);
  }
}

nsIFrame::LogicalSides
nsTableRowFrame::GetLogicalSkipSides(const ReflowInput* aReflowInput) const
{
  if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
                     StyleBoxDecorationBreak::Clone)) {
    return LogicalSides();
  }

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

// Calculate the cell's actual bsize given its pass2 bsize.
// Takes into account the specified bsize (in the style).
// Modifies the desired bsize that is passed in.
nsresult
nsTableRowFrame::CalculateCellActualBSize(nsTableCellFrame* aCellFrame,
                                          nscoord&          aDesiredBSize,
                                          WritingMode       aWM)
{
  nscoord specifiedBSize = 0;

  // Get the bsize specified in the style information
  const nsStylePosition* position = aCellFrame->StylePosition();

  int32_t rowSpan = GetTableFrame()->GetEffectiveRowSpan(*aCellFrame);

  const nsStyleCoord& bsizeStyleCoord = position->BSize(aWM);
  switch (bsizeStyleCoord.GetUnit()) {
    case eStyleUnit_Calc: {
      if (bsizeStyleCoord.CalcHasPercent()) {
        // Treat this like "auto"
        break;
      }
      // Fall through to the coord case
      MOZ_FALLTHROUGH;
    }
    case eStyleUnit_Coord: {
      // In quirks mode, table cell isize should be content-box, but bsize
      // should be border-box.
      // Because of this historic anomaly, we do not use quirk.css
      // (since we can't specify one value of box-sizing for isize and another
      // for bsize)
      specifiedBSize = nsRuleNode::ComputeCoordPercentCalc(bsizeStyleCoord, 0);
      if (PresContext()->CompatibilityMode() != eCompatibility_NavQuirks &&
          position->mBoxSizing == StyleBoxSizing::Content) {
        specifiedBSize +=
          aCellFrame->GetLogicalUsedBorderAndPadding(aWM).BStartEnd(aWM);
      }

      if (1 == rowSpan) {
        SetFixedBSize(specifiedBSize);
      }
      break;
    }
    case eStyleUnit_Percent: {
      if (1 == rowSpan) {
        SetPctBSize(bsizeStyleCoord.GetPercentValue());
      }
      // pct bsizes are handled when all of the cells are finished,
      // so don't set specifiedBSize
      break;
    }
    case eStyleUnit_Auto:
    default:
      break;
  }

  // If the specified bsize is greater than the desired bsize,
  // then use the specified bsize
  if (specifiedBSize > aDesiredBSize) {
    aDesiredBSize = specifiedBSize;
  }

  return NS_OK;
}

// Calculates the available isize for the table cell based on the known
// column isizes taking into account column spans and column spacing
static nscoord
CalcAvailISize(nsTableFrame&     aTableFrame,
               nsTableCellFrame& aCellFrame)
{
  nscoord cellAvailISize = 0;
  uint32_t colIndex = aCellFrame.ColIndex();
  int32_t colspan = aTableFrame.GetEffectiveColSpan(aCellFrame);
  NS_ASSERTION(colspan > 0, "effective colspan should be positive");
  nsTableFrame* fifTable =
    static_cast<nsTableFrame*>(aTableFrame.FirstInFlow());

  for (int32_t spanX = 0; spanX < colspan; spanX++) {
    cellAvailISize +=
      fifTable->GetColumnISizeFromFirstInFlow(colIndex + spanX);
    if (spanX > 0 &&
        aTableFrame.ColumnHasCellSpacingBefore(colIndex + spanX)) {
      cellAvailISize += aTableFrame.GetColSpacing(colIndex + spanX - 1);
    }
  }
  return cellAvailISize;
}

nscoord
GetSpaceBetween(int32_t       aPrevColIndex,
                int32_t       aColIndex,
                int32_t       aColSpan,
                nsTableFrame& aTableFrame,
                bool          aCheckVisibility)
{
  nscoord space = 0;
  int32_t colIdx;
  nsTableFrame* fifTable =
    static_cast<nsTableFrame*>(aTableFrame.FirstInFlow());
  for (colIdx = aPrevColIndex + 1; aColIndex > colIdx; colIdx++) {
    bool isCollapsed = false;
    if (!aCheckVisibility) {
      space += fifTable->GetColumnISizeFromFirstInFlow(colIdx);
    }
    else {
      nsTableColFrame* colFrame = aTableFrame.GetColFrame(colIdx);
      const nsStyleVisibility* colVis = colFrame->StyleVisibility();
      bool collapseCol = (NS_STYLE_VISIBILITY_COLLAPSE == colVis->mVisible);
      nsIFrame* cgFrame = colFrame->GetParent();
      const nsStyleVisibility* groupVis = cgFrame->StyleVisibility();
      bool collapseGroup = (NS_STYLE_VISIBILITY_COLLAPSE ==
                              groupVis->mVisible);
      isCollapsed = collapseCol || collapseGroup;
      if (!isCollapsed)
        space += fifTable->GetColumnISizeFromFirstInFlow(colIdx);
    }
    if (!isCollapsed && aTableFrame.ColumnHasCellSpacingBefore(colIdx)) {
      space += aTableFrame.GetColSpacing(colIdx - 1);
    }
  }
  return space;
}

// subtract the bsizes of aRow's prev in flows from the unpaginated bsize
static
nscoord CalcBSizeFromUnpaginatedBSize(nsTableRowFrame& aRow,
                                      WritingMode      aWM)
{
  nscoord bsize = 0;
  nsTableRowFrame* firstInFlow =
    static_cast<nsTableRowFrame*>(aRow.FirstInFlow());
  if (firstInFlow->HasUnpaginatedBSize()) {
    bsize = firstInFlow->GetUnpaginatedBSize();
    for (nsIFrame* prevInFlow = aRow.GetPrevInFlow(); prevInFlow;
         prevInFlow = prevInFlow->GetPrevInFlow()) {
      bsize -= prevInFlow->BSize(aWM);
    }
  }
  return std::max(bsize, 0);
}

void
nsTableRowFrame::ReflowChildren(nsPresContext*           aPresContext,
                                ReflowOutput&     aDesiredSize,
                                const ReflowInput& aReflowInput,
                                nsTableFrame&            aTableFrame,
                                nsReflowStatus&          aStatus)
{
  aStatus = NS_FRAME_COMPLETE;

  // XXXldb Should we be checking constrained bsize instead?
  const bool isPaginated = aPresContext->IsPaginated();
  const bool borderCollapse = aTableFrame.IsBorderCollapse();

  int32_t cellColSpan = 1;  // must be defined here so it's set properly for non-cell kids

  // remember the col index of the previous cell to handle rowspans into this row
  int32_t prevColIndex = -1;
  nscoord iCoord = 0; // running total of children inline-coord offset

  // This computes the max of all cell bsizes
  nscoord cellMaxBSize = 0;

  // Reflow each of our existing cell frames
  WritingMode wm = aReflowInput.GetWritingMode();
  nsSize containerSize =
    aReflowInput.ComputedSizeAsContainerIfConstrained();

  for (nsIFrame* kidFrame : mFrames) {
    nsTableCellFrame *cellFrame = do_QueryFrame(kidFrame);
    if (!cellFrame) {
      // XXXldb nsCSSFrameConstructor needs to enforce this!
      NS_NOTREACHED("yikes, a non-row child");

      // it's an unknown frame type, give it a generic reflow and ignore the results
      TableCellReflowInput
        kidReflowInput(aPresContext, aReflowInput, kidFrame,
                       LogicalSize(kidFrame->GetWritingMode(), 0, 0),
                       ReflowInput::CALLER_WILL_INIT);
      InitChildReflowInput(*aPresContext, LogicalSize(wm), false, kidReflowInput);
      ReflowOutput desiredSize(aReflowInput);
      nsReflowStatus  status;
      ReflowChild(kidFrame, aPresContext, desiredSize, kidReflowInput, 0, 0,
                  ReflowChildFlags::Default, status);
      kidFrame->DidReflow(aPresContext, nullptr, nsDidReflowStatus::FINISHED);

      continue;
    }

    // See if we should only reflow the dirty child frames
    bool doReflowChild = true;
    if (!aReflowInput.ShouldReflowAllKids() &&
        !aTableFrame.IsGeometryDirty() &&
        !NS_SUBTREE_DIRTY(kidFrame)) {
      if (!aReflowInput.mFlags.mSpecialBSizeReflow)
        doReflowChild = false;
    }
    else if ((NS_UNCONSTRAINEDSIZE != aReflowInput.AvailableBSize())) {
      // We don't reflow a rowspan >1 cell here with a constrained bsize.
      // That happens in nsTableRowGroupFrame::SplitSpanningCells.
      if (aTableFrame.GetEffectiveRowSpan(*cellFrame) > 1) {
        doReflowChild = false;
      }
    }
    if (aReflowInput.mFlags.mSpecialBSizeReflow) {
      if (!isPaginated &&
          !cellFrame->HasAnyStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE)) {
        continue;
      }
    }

    uint32_t cellColIndex = cellFrame->ColIndex();
    cellColSpan = aTableFrame.GetEffectiveColSpan(*cellFrame);

    // If the adjacent cell is in a prior row (because of a rowspan) add in the space
    // NOTE: prevColIndex can be -1 here.
    if (prevColIndex != (static_cast<int32_t>(cellColIndex) - 1)) {
      iCoord += GetSpaceBetween(prevColIndex, cellColIndex, cellColSpan, aTableFrame,
                                false);
    }

    // remember the rightmost (ltr) or leftmost (rtl) column this cell spans into
    prevColIndex = cellColIndex + (cellColSpan - 1);

    // Reflow the child frame
    nsRect kidRect = kidFrame->GetRect();
    LogicalPoint origKidNormalPosition =
      kidFrame->GetLogicalNormalPosition(wm, containerSize);
    // All cells' no-relative-positioning position should be snapped to the
    // row's bstart edge.
    // This doesn't hold in vertical-rl mode, where we don't yet know the
    // correct containerSize for the row frame. In that case, we'll have to
    // fix up child positions later, after determining our desiredSize.
    NS_ASSERTION(origKidNormalPosition.B(wm) == 0 || wm.IsVerticalRL(),
                 "unexpected kid position");

    nsRect kidVisualOverflow = kidFrame->GetVisualOverflowRect();
    LogicalPoint kidPosition(wm, iCoord, 0);
    bool firstReflow = kidFrame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW);

    if (doReflowChild) {
      // Calculate the available isize for the table cell using the known
      // column isizes
      nscoord availCellISize = CalcAvailISize(aTableFrame, *cellFrame);

      Maybe<TableCellReflowInput> kidReflowInput;
      ReflowOutput desiredSize(aReflowInput);

      // If the avail isize is not the same as last time we reflowed the cell or
      // the cell wants to be bigger than what was available last time or
      // it is a style change reflow or we are printing, then we must reflow the
      // cell. Otherwise we can skip the reflow.
      // XXXldb Why is this condition distinct from doReflowChild above?
      WritingMode wm = aReflowInput.GetWritingMode();
      NS_ASSERTION(cellFrame->GetWritingMode() == wm,
                   "expected consistent writing-mode within table");
      LogicalSize cellDesiredSize = cellFrame->GetDesiredSize();
      if ((availCellISize != cellFrame->GetPriorAvailISize())           ||
          (cellDesiredSize.ISize(wm) > cellFrame->GetPriorAvailISize()) ||
          HasAnyStateBits(NS_FRAME_IS_DIRTY)                            ||
          isPaginated                                                   ||
          NS_SUBTREE_DIRTY(cellFrame)                                   ||
          // See if it needs a special reflow, or if it had one that we need to undo.
          cellFrame->HasAnyStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE)  ||
          HasPctBSize()) {
        // Reflow the cell to fit the available isize, bsize
        // XXX The old IR_ChildIsDirty code used availCellISize here.
        LogicalSize kidAvailSize(wm, availCellISize, aReflowInput.AvailableBSize());

        // Reflow the child
        kidReflowInput.emplace(aPresContext, aReflowInput, kidFrame,
                               kidAvailSize,
                               ReflowInput::CALLER_WILL_INIT);
        InitChildReflowInput(*aPresContext, kidAvailSize, borderCollapse,
                             *kidReflowInput);

        nsReflowStatus status;
        ReflowChild(kidFrame, aPresContext, desiredSize, *kidReflowInput, wm,
                    kidPosition, containerSize, ReflowChildFlags::Default,
                    status);

        // allow the table to determine if/how the table needs to be rebalanced
        // If any of the cells are not complete, then we're not complete
        if (NS_FRAME_IS_NOT_COMPLETE(status)) {
          aStatus = NS_FRAME_NOT_COMPLETE;
        }
      } else {
        if (iCoord != origKidNormalPosition.I(wm)) {
          kidFrame->InvalidateFrameSubtree();
        }

        desiredSize.SetSize(wm, cellDesiredSize);
        desiredSize.mOverflowAreas = cellFrame->GetOverflowAreas();

        // if we are in a floated table, our position is not yet established, so we cannot reposition our views
        // the containing block will do this for us after positioning the table
        if (!aTableFrame.IsFloating()) {
          // Because we may have moved the frame we need to make sure any views are
          // positioned properly. We have to do this, because any one of our parent
          // frames could have moved and we have no way of knowing...
          nsTableFrame::RePositionViews(kidFrame);
        }
      }

      if (NS_UNCONSTRAINEDSIZE == aReflowInput.AvailableBSize()) {
        if (!GetPrevInFlow()) {
          // Calculate the cell's actual bsize given its pass2 bsize. This
          // function takes into account the specified bsize (in the style)
          CalculateCellActualBSize(cellFrame, desiredSize.BSize(wm), wm);
        }
        // bsize may have changed, adjust descent to absorb any excess difference
        nscoord ascent;
        if (!kidFrame->PrincipalChildList().FirstChild()->PrincipalChildList().FirstChild()) {
          ascent = desiredSize.BSize(wm);
        } else {
          ascent = ((nsTableCellFrame *)kidFrame)->GetCellBaseline();
        }
        nscoord descent = desiredSize.BSize(wm) - ascent;
        UpdateBSize(desiredSize.BSize(wm), ascent, descent, &aTableFrame, cellFrame);
      } else {
        cellMaxBSize = std::max(cellMaxBSize, desiredSize.BSize(wm));
        int32_t rowSpan = aTableFrame.GetEffectiveRowSpan((nsTableCellFrame&)*kidFrame);
        if (1 == rowSpan) {
          SetContentBSize(cellMaxBSize);
        }
      }

      // Place the child
      desiredSize.ISize(wm) = availCellISize;

      if (kidReflowInput) {
        // We reflowed. Apply relative positioning in the normal way.
        kidReflowInput->ApplyRelativePositioning(&kidPosition, containerSize);
      } else if (kidFrame->IsRelativelyPositioned()) {
        // We didn't reflow.  Do the positioning part of what
        // MovePositionBy does internally.  (This codepath should really
        // be merged into the else below if we can.)
        nsMargin* computedOffsetProp =
          kidFrame->GetProperty(nsIFrame::ComputedOffsetProperty());

        // On our fist reflow sticky children may not have the property yet (we
        // need to reflow the children first to size the scroll frame).
        LogicalMargin computedOffsets(wm, computedOffsetProp ? *computedOffsetProp : nsMargin());
        ReflowInput::ApplyRelativePositioning(kidFrame, wm, computedOffsets, &kidPosition, containerSize);
      }

      // In vertical-rl mode, we are likely to have containerSize.width = 0
      // because ComputedWidth() was NS_UNCONSTRAINEDSIZE.
      // For cases where that's wrong, we will fix up the position later.
      FinishReflowChild(kidFrame, aPresContext, desiredSize, nullptr, wm,
                        kidPosition, containerSize, ReflowChildFlags::Default);

      nsTableFrame::InvalidateTableFrame(kidFrame, kidRect, kidVisualOverflow,
                                         firstReflow);

      iCoord += desiredSize.ISize(wm);
    } else {
      if (iCoord != origKidNormalPosition.I(wm)) {
        // Invalidate the old position
        kidFrame->InvalidateFrameSubtree();
        // Move to the new position. As above, we need to account for relative
        // positioning.
        kidFrame->MovePositionBy(wm,
          LogicalPoint(wm, iCoord - origKidNormalPosition.I(wm), 0));
        nsTableFrame::RePositionViews(kidFrame);
        // invalidate the new position
        kidFrame->InvalidateFrameSubtree();
      }
      // we need to account for the cell's isize even if it isn't reflowed
      iCoord += kidFrame->ISize(wm);

      if (kidFrame->GetNextInFlow()) {
        aStatus = NS_FRAME_NOT_COMPLETE;
      }
    }
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, kidFrame);
    iCoord += aTableFrame.GetColSpacing(cellColIndex);
  }

  // Just set our isize to what was available.
  // The table will calculate the isize and not use our value.
  aDesiredSize.ISize(wm) = aReflowInput.AvailableISize();

  if (aReflowInput.mFlags.mSpecialBSizeReflow) {
    aDesiredSize.BSize(wm) = BSize(wm);
  } else if (NS_UNCONSTRAINEDSIZE == aReflowInput.AvailableBSize()) {
    aDesiredSize.BSize(wm) = CalcBSize(aReflowInput);
    if (GetPrevInFlow()) {
      nscoord bsize = CalcBSizeFromUnpaginatedBSize(*this, wm);
      aDesiredSize.BSize(wm) = std::max(aDesiredSize.BSize(wm), bsize);
    } else {
      if (isPaginated && HasStyleBSize()) {
        // set the unpaginated bsize so next in flows can try to honor it
        SetHasUnpaginatedBSize(true);
        SetUnpaginatedBSize(aPresContext, aDesiredSize.BSize(wm));
      }
      if (isPaginated && HasUnpaginatedBSize()) {
        aDesiredSize.BSize(wm) = std::max(aDesiredSize.BSize(wm),
                                          GetUnpaginatedBSize());
      }
    }
  } else { // constrained bsize, paginated
    // Compute the bsize we should have from style (subtracting the
    // bsize from our prev-in-flows from the style bsize)
    nscoord styleBSize = CalcBSizeFromUnpaginatedBSize(*this, wm);
    if (styleBSize > aReflowInput.AvailableBSize()) {
      styleBSize = aReflowInput.AvailableBSize();
      NS_FRAME_SET_INCOMPLETE(aStatus);
    }
    aDesiredSize.BSize(wm) = std::max(cellMaxBSize, styleBSize);
  }

  if (wm.IsVerticalRL()) {
    // Any children whose width was not the same as our final
    // aDesiredSize.BSize will have been misplaced earlier at the
    // FinishReflowChild stage. So fix them up now.
    for (nsIFrame* kidFrame : mFrames) {
      nsTableCellFrame *cellFrame = do_QueryFrame(kidFrame);
      if (!cellFrame) {
        continue;
      }
      if (kidFrame->BSize(wm) != aDesiredSize.BSize(wm)) {
        kidFrame->MovePositionBy(wm,
          LogicalPoint(wm, 0, kidFrame->BSize(wm) - aDesiredSize.BSize(wm)));
        nsTableFrame::RePositionViews(kidFrame);
        // Do we need to InvalidateFrameSubtree() here?
      }
    }
  }

  aDesiredSize.UnionOverflowAreasWithDesiredBounds();
  FinishAndStoreOverflow(&aDesiredSize);
}

/** Layout the entire row.
  * This method stacks cells in the inline dir according to HTML 4.0 rules.
  */
void
nsTableRowFrame::Reflow(nsPresContext*           aPresContext,
                        ReflowOutput&     aDesiredSize,
                        const ReflowInput& aReflowInput,
                        nsReflowStatus&          aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsTableRowFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);

  WritingMode wm = aReflowInput.GetWritingMode();

  nsTableFrame* tableFrame = GetTableFrame();
  const nsStyleVisibility* rowVis = StyleVisibility();
  bool collapseRow = (NS_STYLE_VISIBILITY_COLLAPSE == rowVis->mVisible);
  if (collapseRow) {
    tableFrame->SetNeedToCollapse(true);
  }

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

  // See if we have a cell with specified/pct bsize
  InitHasCellWithStyleBSize(tableFrame);

  ReflowChildren(aPresContext, aDesiredSize, aReflowInput, *tableFrame, aStatus);

  if (aPresContext->IsPaginated() && !NS_FRAME_IS_FULLY_COMPLETE(aStatus) &&
      ShouldAvoidBreakInside(aReflowInput)) {
    aStatus = NS_INLINE_LINE_BREAK_BEFORE();
  }

  // Just set our isize to what was available.
  // The table will calculate the isize and not use our value.
  aDesiredSize.ISize(wm) = aReflowInput.AvailableISize();

  // 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();
  }

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

  NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}

/**
 * This function is called by the row group frame's SplitRowGroup() code when
 * pushing a row frame that has cell frames that span into it. The cell frame
 * should be reflowed with the specified height
 */
nscoord
nsTableRowFrame::ReflowCellFrame(nsPresContext*           aPresContext,
                                 const ReflowInput& aReflowInput,
                                 bool                     aIsTopOfPage,
                                 nsTableCellFrame*        aCellFrame,
                                 nscoord                  aAvailableBSize,
                                 nsReflowStatus&          aStatus)
{
  WritingMode wm = aReflowInput.GetWritingMode();

  // Reflow the cell frame with the specified height. Use the existing width
  nsSize containerSize = aCellFrame->GetSize();
  LogicalRect cellRect = aCellFrame->GetLogicalRect(wm, containerSize);
  nsRect cellVisualOverflow = aCellFrame->GetVisualOverflowRect();

  LogicalSize cellSize = cellRect.Size(wm);
  LogicalSize availSize(wm, cellRect.ISize(wm), aAvailableBSize);
  bool borderCollapse = GetTableFrame()->IsBorderCollapse();
  NS_ASSERTION(aCellFrame->GetWritingMode() == wm,
               "expected consistent writing-mode within table");
  TableCellReflowInput
    cellReflowInput(aPresContext, aReflowInput, aCellFrame, availSize,
                    ReflowInput::CALLER_WILL_INIT);
  InitChildReflowInput(*aPresContext, availSize, borderCollapse, cellReflowInput);
  cellReflowInput.mFlags.mIsTopOfPage = aIsTopOfPage;

  ReflowOutput desiredSize(aReflowInput);

  ReflowChild(aCellFrame, aPresContext, desiredSize, cellReflowInput, 0, 0,
              ReflowChildFlags::NoMoveFrame, aStatus);
  bool fullyComplete = NS_FRAME_IS_COMPLETE(aStatus) && !NS_FRAME_IS_TRUNCATED(aStatus);
  if (fullyComplete) {
    desiredSize.BSize(wm) = aAvailableBSize;
  }
  aCellFrame->SetSize(wm, LogicalSize(wm, cellSize.ISize(wm),
                                      desiredSize.BSize(wm)));

  // Note: BlockDirAlignChild can affect the overflow rect.
  // XXX What happens if this cell has 'vertical-align: baseline' ?
  // XXX Why is it assumed that the cell's ascent hasn't changed ?
  if (fullyComplete) {
    aCellFrame->BlockDirAlignChild(wm, mMaxCellAscent);
  }

  nsTableFrame::InvalidateTableFrame(aCellFrame,
                                     cellRect.GetPhysicalRect(wm, containerSize),
                                     cellVisualOverflow,
                                     aCellFrame->
                                       HasAnyStateBits(NS_FRAME_FIRST_REFLOW));

  aCellFrame->DidReflow(aPresContext, nullptr, nsDidReflowStatus::FINISHED);

  return desiredSize.BSize(wm);
}

nscoord
nsTableRowFrame::CollapseRowIfNecessary(nscoord aRowOffset,
                                        nscoord aISize,
                                        bool    aCollapseGroup,
                                        bool&   aDidCollapse)
{
  const nsStyleVisibility* rowVis = StyleVisibility();
  bool collapseRow = (NS_STYLE_VISIBILITY_COLLAPSE == rowVis->mVisible);
  nsTableFrame* tableFrame =
    static_cast<nsTableFrame*>(GetTableFrame()->FirstInFlow());
  if (collapseRow) {
    tableFrame->SetNeedToCollapse(true);
  }

  if (aRowOffset != 0) {
    // We're moving, so invalidate our old position
    InvalidateFrameSubtree();
  }

  WritingMode wm = GetWritingMode();

  nsSize parentSize = GetParent()->GetSize();
  LogicalRect rowRect = GetLogicalRect(wm, parentSize);
  nsRect oldRect = mRect;
  nsRect oldVisualOverflow = GetVisualOverflowRect();

  rowRect.BStart(wm) -= aRowOffset;
  rowRect.ISize(wm)  = aISize;
  nsOverflowAreas overflow;
  nscoord shift = 0;
  nsSize containerSize = mRect.Size();

  if (aCollapseGroup || collapseRow) {
    aDidCollapse = true;
    shift = rowRect.BSize(wm);
    nsTableCellFrame* cellFrame = GetFirstCell();
    if (cellFrame) {
      uint32_t rowIndex = cellFrame->RowIndex();
      shift += tableFrame->GetRowSpacing(rowIndex);
      while (cellFrame) {
        LogicalRect cRect = cellFrame->GetLogicalRect(wm, containerSize);
        // If aRowOffset != 0, there's no point in invalidating the cells, since
        // we've already invalidated our overflow area.  Note that we _do_ still
        // need to invalidate if our row is not moving, because the cell might
        // span out of this row, so invalidating our row rect won't do enough.
        if (aRowOffset == 0) {
          InvalidateFrame();
        }
        cRect.BSize(wm) = 0;
        cellFrame->SetRect(wm, cRect, containerSize);
        cellFrame = cellFrame->GetNextCell();
      }
    } else {
      shift += tableFrame->GetRowSpacing(GetRowIndex());
    }
    rowRect.BSize(wm) = 0;
  }
  else { // row is not collapsed
    // remember the col index of the previous cell to handle rowspans into this
    // row
    int32_t prevColIndex = -1;
    nscoord iPos = 0; // running total of children inline-axis offset
    nsTableFrame* fifTable =
      static_cast<nsTableFrame*>(tableFrame->FirstInFlow());

    for (nsIFrame* kidFrame : mFrames) {
      nsTableCellFrame *cellFrame = do_QueryFrame(kidFrame);
      if (cellFrame) {
        uint32_t cellColIndex = cellFrame->ColIndex();
        int32_t cellColSpan = tableFrame->GetEffectiveColSpan(*cellFrame);

        // If the adjacent cell is in a prior row (because of a rowspan) add in
        // the space
        // NOTE: prevColIndex can be -1 here.
        if (prevColIndex != (static_cast<int32_t>(cellColIndex) - 1)) {
          iPos += GetSpaceBetween(prevColIndex, cellColIndex, cellColSpan,
                                  *tableFrame, true);
        }
        LogicalRect cRect(wm, iPos, 0, 0, rowRect.BSize(wm));

        // remember the last (iend-wards-most) column this cell spans into
        prevColIndex = cellColIndex + cellColSpan - 1;
        int32_t actualColSpan = cellColSpan;
        bool isVisible = false;
        for (int32_t colIdx = cellColIndex; actualColSpan > 0;
             colIdx++, actualColSpan--) {

          nsTableColFrame* colFrame = tableFrame->GetColFrame(colIdx);
          const nsStyleVisibility* colVis = colFrame->StyleVisibility();
          bool collapseCol = (NS_STYLE_VISIBILITY_COLLAPSE ==
                                colVis->mVisible);
          nsIFrame* cgFrame = colFrame->GetParent();
          const nsStyleVisibility* groupVis = cgFrame->StyleVisibility();
          bool collapseGroup = (NS_STYLE_VISIBILITY_COLLAPSE ==
                                  groupVis->mVisible);
          bool isCollapsed = collapseCol || collapseGroup;
          if (!isCollapsed) {
            cRect.ISize(wm) += fifTable->GetColumnISizeFromFirstInFlow(colIdx);
            isVisible = true;
            if ((actualColSpan > 1)) {
              nsTableColFrame* nextColFrame =
                tableFrame->GetColFrame(colIdx + 1);
              const nsStyleVisibility* nextColVis =
              nextColFrame->StyleVisibility();
              if ( (NS_STYLE_VISIBILITY_COLLAPSE != nextColVis->mVisible) &&
                  tableFrame->ColumnHasCellSpacingBefore(colIdx + 1)) {
                cRect.ISize(wm) += tableFrame->GetColSpacing(cellColIndex);
              }
            }
          }
        }
        iPos += cRect.ISize(wm);
        if (isVisible) {
          iPos += tableFrame->GetColSpacing(cellColIndex);
        }
        int32_t actualRowSpan = tableFrame->GetEffectiveRowSpan(*cellFrame);
        nsTableRowFrame* rowFrame = GetNextRow();
        for (actualRowSpan--; actualRowSpan > 0 && rowFrame; actualRowSpan--) {
          const nsStyleVisibility* nextRowVis = rowFrame->StyleVisibility();
          bool collapseNextRow = (NS_STYLE_VISIBILITY_COLLAPSE ==
                                    nextRowVis->mVisible);
          if (!collapseNextRow) {
            LogicalRect nextRect = rowFrame->GetLogicalRect(wm,
                                                            containerSize);
            cRect.BSize(wm) +=
              nextRect.BSize(wm) +
              tableFrame->GetRowSpacing(rowFrame->GetRowIndex());
          }
          rowFrame = rowFrame->GetNextRow();
        }

        nsRect oldCellRect = cellFrame->GetRect();
        LogicalPoint oldCellNormalPos =
          cellFrame->GetLogicalNormalPosition(wm, containerSize);

        nsRect oldCellVisualOverflow = cellFrame->GetVisualOverflowRect();

        if (aRowOffset == 0 && cRect.Origin(wm) != oldCellNormalPos) {
          // We're moving the cell.  Invalidate the old overflow area
          cellFrame->InvalidateFrameSubtree();
        }

        cellFrame->MovePositionBy(wm, cRect.Origin(wm) - oldCellNormalPos);
        cellFrame->SetSize(wm, cRect.Size(wm));

        // XXXbz This looks completely bogus in the cases when we didn't
        // collapse the cell!
        LogicalRect cellBounds(wm, 0, 0, cRect.ISize(wm), cRect.BSize(wm));
        nsRect cellPhysicalBounds =
          cellBounds.GetPhysicalRect(wm, containerSize);
        nsOverflowAreas cellOverflow(cellPhysicalBounds, cellPhysicalBounds);
        cellFrame->FinishAndStoreOverflow(cellOverflow,
                                          cRect.Size(wm).GetPhysicalSize(wm));
        nsTableFrame::RePositionViews(cellFrame);
        ConsiderChildOverflow(overflow, cellFrame);

        if (aRowOffset == 0) {
          nsTableFrame::InvalidateTableFrame(cellFrame, oldCellRect,
                                             oldCellVisualOverflow, false);
        }
      }
    }
  }

  SetRect(wm, rowRect, containerSize);
  overflow.UnionAllWith(nsRect(0, 0, rowRect.Width(wm), rowRect.Height(wm)));
  FinishAndStoreOverflow(overflow, rowRect.Size(wm).GetPhysicalSize(wm));

  nsTableFrame::RePositionViews(this);
  nsTableFrame::InvalidateTableFrame(this, oldRect, oldVisualOverflow, false);
  return shift;
}

/*
 * The following method is called by the row group frame's SplitRowGroup()
 * when it creates a continuing cell frame and wants to insert it into the
 * row's child list.
 */
void
nsTableRowFrame::InsertCellFrame(nsTableCellFrame* aFrame,
                                 int32_t           aColIndex)
{
  // Find the cell frame where col index < aColIndex
  nsTableCellFrame* priorCell = nullptr;
  for (nsIFrame* child : mFrames) {
    nsTableCellFrame *cellFrame = do_QueryFrame(child);
    if (cellFrame) {
      uint32_t colIndex = cellFrame->ColIndex();
      // Can aColIndex be -1 here?  Let's assume it can for now.
      if (static_cast<int32_t>(colIndex) < aColIndex) {
        priorCell = cellFrame;
      }
      else break;
    }
  }
  mFrames.InsertFrame(this, priorCell, aFrame);
}

nsIAtom*
nsTableRowFrame::GetType() const
{
  return nsGkAtoms::tableRowFrame;
}

nsTableRowFrame*
nsTableRowFrame::GetNextRow() const
{
  nsIFrame* childFrame = GetNextSibling();
  while (childFrame) {
    nsTableRowFrame *rowFrame = do_QueryFrame(childFrame);
    if (rowFrame) {
	  NS_ASSERTION(mozilla::StyleDisplay::TableRow == childFrame->StyleDisplay()->mDisplay,
                 "wrong display type on rowframe");
      return rowFrame;
    }
    childFrame = childFrame->GetNextSibling();
  }
  return nullptr;
}

NS_DECLARE_FRAME_PROPERTY_SMALL_VALUE(RowUnpaginatedHeightProperty, nscoord)

void
nsTableRowFrame::SetUnpaginatedBSize(nsPresContext* aPresContext,
                                     nscoord        aValue)
{
  NS_ASSERTION(!GetPrevInFlow(), "program error");
  // Set the property
  SetProperty(RowUnpaginatedHeightProperty(), aValue);
}

nscoord
nsTableRowFrame::GetUnpaginatedBSize()
{
  return GetProperty(RowUnpaginatedHeightProperty());
}

void nsTableRowFrame::SetContinuousBCBorderWidth(LogicalSide aForSide,
                                                 BCPixelSize aPixelValue)
{
  switch (aForSide) {
    case eLogicalSideIEnd:
      mIEndContBorderWidth = aPixelValue;
      return;
    case eLogicalSideBStart:
      mBStartContBorderWidth = aPixelValue;
      return;
    case eLogicalSideIStart:
      mIStartContBorderWidth = aPixelValue;
      return;
    default:
      NS_ERROR("invalid NS_SIDE arg");
  }
}
#ifdef ACCESSIBILITY
a11y::AccType
nsTableRowFrame::AccessibleType()
{
  return a11y::eHTMLTableRowType;
}
#endif
/**
 * Sets the NS_ROW_HAS_CELL_WITH_STYLE_BSIZE bit to indicate whether
 * this row has any cells that have non-auto-bsize.  (Row-spanning
 * cells are ignored.)
 */
void nsTableRowFrame::InitHasCellWithStyleBSize(nsTableFrame* aTableFrame)
{
  WritingMode wm = GetWritingMode();

  for (nsIFrame* kidFrame : mFrames) {
    nsTableCellFrame *cellFrame = do_QueryFrame(kidFrame);
    if (!cellFrame) {
      NS_NOTREACHED("Table row has a non-cell child.");
      continue;
    }
    // Ignore row-spanning cells
    const nsStyleCoord &cellBSize = cellFrame->StylePosition()->BSize(wm);
    if (aTableFrame->GetEffectiveRowSpan(*cellFrame) == 1 &&
        cellBSize.GetUnit() != eStyleUnit_Auto &&
         /* calc() with percentages treated like 'auto' */
        (!cellBSize.IsCalcUnit() || !cellBSize.HasPercent())) {
      AddStateBits(NS_ROW_HAS_CELL_WITH_STYLE_BSIZE);
      return;
    }
  }
  RemoveStateBits(NS_ROW_HAS_CELL_WITH_STYLE_BSIZE);
}

void
nsTableRowFrame::InvalidateFrame(uint32_t aDisplayItemKey)
{
  nsIFrame::InvalidateFrame(aDisplayItemKey);
  GetParent()->InvalidateFrameWithRect(GetVisualOverflowRect() + GetPosition(), aDisplayItemKey);
}

void
nsTableRowFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey)
{
  nsIFrame::InvalidateFrameWithRect(aRect, aDisplayItemKey);
  // 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);
}

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

nsTableRowFrame*
NS_NewTableRowFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsTableRowFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsTableRowFrame)

#ifdef DEBUG_FRAME_DUMP
nsresult
nsTableRowFrame::GetFrameName(nsAString& aResult) const
{
  return MakeFrameName(NS_LITERAL_STRING("TableRow"), aResult);
}
#endif