summaryrefslogtreecommitdiff
path: root/layout/generic/nsRubyBaseContainerFrame.cpp
blob: ed2a35b41732b7f04ec40b24d10776043878d83e (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
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code is subject to the terms of the Mozilla Public License
 * version 2.0 (the "License"). You can obtain a copy of the License at
 * http://mozilla.org/MPL/2.0/. */

/* rendering object for CSS "display: ruby-base-container" */

#include "nsRubyBaseContainerFrame.h"
#include "nsRubyTextContainerFrame.h"
#include "nsRubyBaseFrame.h"
#include "nsRubyTextFrame.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Maybe.h"
#include "mozilla/WritingModes.h"
#include "nsLayoutUtils.h"
#include "nsLineLayout.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleStructInlines.h"
#include "nsTextFrame.h"
#include "RubyUtils.h"

using namespace mozilla;
using namespace mozilla::gfx;

//----------------------------------------------------------------------

// Frame class boilerplate
// =======================

NS_QUERYFRAME_HEAD(nsRubyBaseContainerFrame)
  NS_QUERYFRAME_ENTRY(nsRubyBaseContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)

NS_IMPL_FRAMEARENA_HELPERS(nsRubyBaseContainerFrame)

nsContainerFrame*
NS_NewRubyBaseContainerFrame(nsIPresShell* aPresShell,
                             nsStyleContext* aContext)
{
  return new (aPresShell) nsRubyBaseContainerFrame(aContext);
}


//----------------------------------------------------------------------

// nsRubyBaseContainerFrame Method Implementations
// ===============================================

nsIAtom*
nsRubyBaseContainerFrame::GetType() const
{
  return nsGkAtoms::rubyBaseContainerFrame;
}

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

static gfxBreakPriority
LineBreakBefore(nsIFrame* aFrame,
                DrawTarget* aDrawTarget,
                nsIFrame* aLineContainerFrame,
                const nsLineList::iterator* aLine)
{
  for (nsIFrame* child = aFrame; child;
       child = child->PrincipalChildList().FirstChild()) {
    if (!child->CanContinueTextRun()) {
      // It is not an inline element. We can break before it.
      return gfxBreakPriority::eNormalBreak;
    }
    if (child->GetType() != nsGkAtoms::textFrame) {
      continue;
    }

    auto textFrame = static_cast<nsTextFrame*>(child);
    gfxSkipCharsIterator iter =
      textFrame->EnsureTextRun(nsTextFrame::eInflated, aDrawTarget,
                               aLineContainerFrame, aLine);
    iter.SetOriginalOffset(textFrame->GetContentOffset());
    uint32_t pos = iter.GetSkippedOffset();
    gfxTextRun* textRun = textFrame->GetTextRun(nsTextFrame::eInflated);
    if (pos >= textRun->GetLength()) {
      // The text frame contains no character at all.
      return gfxBreakPriority::eNoBreak;
    }
    // Return whether we can break before the first character.
    if (textRun->CanBreakLineBefore(pos)) {
      return gfxBreakPriority::eNormalBreak;
    }
    // Check whether we can wrap word here.
    const nsStyleText* textStyle = textFrame->StyleText();
    if (textStyle->WordCanWrap(textFrame) && textRun->IsClusterStart(pos)) {
      return gfxBreakPriority::eWordWrapBreak;
    }
    // We cannot break before.
    return gfxBreakPriority::eNoBreak;
  }
  // Neither block, nor text frame is found as a leaf. We won't break
  // before this base frame. It is the behavior of empty spans.
  return gfxBreakPriority::eNoBreak;
}

static void
GetIsLineBreakAllowed(nsIFrame* aFrame, bool aIsLineBreakable,
                      bool* aAllowInitialLineBreak, bool* aAllowLineBreak)
{
  nsIFrame* parent = aFrame->GetParent();
  bool lineBreakSuppressed = parent->StyleContext()->ShouldSuppressLineBreak();
  // Allow line break between ruby bases when white-space allows,
  // we are not inside a nested ruby, and there is no span.
  bool allowLineBreak = !lineBreakSuppressed &&
                        aFrame->StyleText()->WhiteSpaceCanWrap(aFrame);
  bool allowInitialLineBreak = allowLineBreak;
  if (!aFrame->GetPrevInFlow()) {
    allowInitialLineBreak = !lineBreakSuppressed &&
                            parent->StyleText()->WhiteSpaceCanWrap(parent);
  }
  if (!aIsLineBreakable) {
    allowInitialLineBreak = false;
  }
  *aAllowInitialLineBreak = allowInitialLineBreak;
  *aAllowLineBreak = allowLineBreak;
}

/**
 * @param aBaseISizeData is an in/out param. This method updates the
 * `skipWhitespace` and `trailingWhitespace` fields of the struct with
 * the base level frame. Note that we don't need to do the same thing
 * for ruby text frames, because they are text run container themselves
 * (see nsTextFrame.cpp:BuildTextRuns), and thus no whitespace collapse
 * happens across the boundary of those frames.
 */
static nscoord
CalculateColumnPrefISize(nsRenderingContext* aRenderingContext,
                         const RubyColumnEnumerator& aEnumerator,
                         nsIFrame::InlineIntrinsicISizeData* aBaseISizeData)
{
  nscoord max = 0;
  uint32_t levelCount = aEnumerator.GetLevelCount();
  for (uint32_t i = 0; i < levelCount; i++) {
    nsIFrame* frame = aEnumerator.GetFrameAtLevel(i);
    if (frame) {
      nsIFrame::InlinePrefISizeData data;
      if (i == 0) {
        data.SetLineContainer(aBaseISizeData->LineContainer());
        data.mSkipWhitespace = aBaseISizeData->mSkipWhitespace;
        data.mTrailingWhitespace = aBaseISizeData->mTrailingWhitespace;
      } else {
        // The line container of ruby text frames is their parent,
        // ruby text container frame.
        data.SetLineContainer(frame->GetParent());
      }
      frame->AddInlinePrefISize(aRenderingContext, &data);
      MOZ_ASSERT(data.mPrevLines == 0, "Shouldn't have prev lines");
      max = std::max(max, data.mCurrentLine);
      if (i == 0) {
        aBaseISizeData->mSkipWhitespace = data.mSkipWhitespace;
        aBaseISizeData->mTrailingWhitespace = data.mTrailingWhitespace;
      }
    }
  }
  return max;
}

// FIXME Currently we use pref isize of ruby content frames for
//       computing min isize of ruby frame, which may cause problem.
//       See bug 1134945.
/* virtual */ void
nsRubyBaseContainerFrame::AddInlineMinISize(
  nsRenderingContext *aRenderingContext, nsIFrame::InlineMinISizeData *aData)
{
  AutoRubyTextContainerArray textContainers(this);

  for (uint32_t i = 0, iend = textContainers.Length(); i < iend; i++) {
    if (textContainers[i]->IsSpanContainer()) {
      // Since spans are not breakable internally, use our pref isize
      // directly if there is any span.
      nsIFrame::InlinePrefISizeData data;
      data.SetLineContainer(aData->LineContainer());
      data.mSkipWhitespace = aData->mSkipWhitespace;
      data.mTrailingWhitespace = aData->mTrailingWhitespace;
      AddInlinePrefISize(aRenderingContext, &data);
      aData->mCurrentLine += data.mCurrentLine;
      if (data.mCurrentLine > 0) {
        aData->mAtStartOfLine = false;
      }
      aData->mSkipWhitespace = data.mSkipWhitespace;
      aData->mTrailingWhitespace = data.mTrailingWhitespace;
      return;
    }
  }

  bool firstFrame = true;
  bool allowInitialLineBreak, allowLineBreak;
  GetIsLineBreakAllowed(this, !aData->mAtStartOfLine,
                        &allowInitialLineBreak, &allowLineBreak);
  for (nsIFrame* frame = this; frame; frame = frame->GetNextInFlow()) {
    RubyColumnEnumerator enumerator(
      static_cast<nsRubyBaseContainerFrame*>(frame), textContainers);
    for (; !enumerator.AtEnd(); enumerator.Next()) {
      if (firstFrame ? allowInitialLineBreak : allowLineBreak) {
        nsIFrame* baseFrame = enumerator.GetFrameAtLevel(0);
        if (baseFrame) {
          gfxBreakPriority breakPriority =
            LineBreakBefore(baseFrame, aRenderingContext->GetDrawTarget(),
                            nullptr, nullptr);
          if (breakPriority != gfxBreakPriority::eNoBreak) {
            aData->OptionallyBreak();
          }
        }
      }
      firstFrame = false;
      nscoord isize = CalculateColumnPrefISize(aRenderingContext,
                                               enumerator, aData);
      aData->mCurrentLine += isize;
      if (isize > 0) {
        aData->mAtStartOfLine = false;
      }
    }
  }
}

/* virtual */ void
nsRubyBaseContainerFrame::AddInlinePrefISize(
  nsRenderingContext *aRenderingContext, nsIFrame::InlinePrefISizeData *aData)
{
  AutoRubyTextContainerArray textContainers(this);

  nscoord sum = 0;
  for (nsIFrame* frame = this; frame; frame = frame->GetNextInFlow()) {
    RubyColumnEnumerator enumerator(
      static_cast<nsRubyBaseContainerFrame*>(frame), textContainers);
    for (; !enumerator.AtEnd(); enumerator.Next()) {
      sum += CalculateColumnPrefISize(aRenderingContext, enumerator, aData);
    }
  }
  for (uint32_t i = 0, iend = textContainers.Length(); i < iend; i++) {
    if (textContainers[i]->IsSpanContainer()) {
      nsIFrame* frame = textContainers[i]->PrincipalChildList().FirstChild();
      nsIFrame::InlinePrefISizeData data;
      frame->AddInlinePrefISize(aRenderingContext, &data);
      MOZ_ASSERT(data.mPrevLines == 0, "Shouldn't have prev lines");
      sum = std::max(sum, data.mCurrentLine);
    }
  }
  aData->mCurrentLine += sum;
}

/* virtual */ bool 
nsRubyBaseContainerFrame::IsFrameOfType(uint32_t aFlags) const 
{
  if (aFlags & eSupportsCSSTransforms) {
    return false;
  }
  return nsContainerFrame::IsFrameOfType(aFlags &
         ~(nsIFrame::eLineParticipant));
}

/* virtual */ bool
nsRubyBaseContainerFrame::CanContinueTextRun() const
{
  return true;
}

/* virtual */ LogicalSize
nsRubyBaseContainerFrame::ComputeSize(nsRenderingContext *aRenderingContext,
                                      WritingMode aWM,
                                      const LogicalSize& aCBSize,
                                      nscoord aAvailableISize,
                                      const LogicalSize& aMargin,
                                      const LogicalSize& aBorder,
                                      const LogicalSize& aPadding,
                                      ComputeSizeFlags aFlags)
{
  // Ruby base container frame is inline,
  // hence don't compute size before reflow.
  return LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}

/* virtual */ nscoord
nsRubyBaseContainerFrame::GetLogicalBaseline(WritingMode aWritingMode) const
{
  return mBaseline;
}

struct nsRubyBaseContainerFrame::RubyReflowInput
{
  bool mAllowInitialLineBreak;
  bool mAllowLineBreak;
  const AutoRubyTextContainerArray& mTextContainers;
  const ReflowInput& mBaseReflowInput;
  const nsTArray<UniquePtr<ReflowInput>>& mTextReflowInputs;
};

/* virtual */ void
nsRubyBaseContainerFrame::Reflow(nsPresContext* aPresContext,
                                 ReflowOutput& aDesiredSize,
                                 const ReflowInput& aReflowInput,
                                 nsReflowStatus& aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsRubyBaseContainerFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  aStatus = NS_FRAME_COMPLETE;

  if (!aReflowInput.mLineLayout) {
    NS_ASSERTION(
      aReflowInput.mLineLayout,
      "No line layout provided to RubyBaseContainerFrame reflow method.");
    return;
  }

  mDescendantLeadings.Reset();

  MoveOverflowToChildList();
  // Ask text containers to drain overflows
  AutoRubyTextContainerArray textContainers(this);
  const uint32_t rtcCount = textContainers.Length();
  for (uint32_t i = 0; i < rtcCount; i++) {
    textContainers[i]->MoveOverflowToChildList();
  }

  WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
  LogicalSize availSize(lineWM, aReflowInput.AvailableISize(),
                        aReflowInput.AvailableBSize());

  // We have a reflow state and a line layout for each RTC.
  // They are conceptually the state of the RTCs, but we don't actually
  // reflow those RTCs in this code. These two arrays are holders of
  // the reflow states and line layouts.
  // Since there are pointers refer to reflow states and line layouts,
  // it is necessary to guarantee that they won't be moved. For this
  // reason, they are wrapped in UniquePtr here.
  AutoTArray<UniquePtr<ReflowInput>, RTC_ARRAY_SIZE> reflowInputs;
  AutoTArray<UniquePtr<nsLineLayout>, RTC_ARRAY_SIZE> lineLayouts;
  reflowInputs.SetCapacity(rtcCount);
  lineLayouts.SetCapacity(rtcCount);

  // Begin the line layout for each ruby text container in advance.
  bool hasSpan = false;
  for (uint32_t i = 0; i < rtcCount; i++) {
    nsRubyTextContainerFrame* textContainer = textContainers[i];
    if (textContainer->IsSpanContainer()) {
      hasSpan = true;
    }

    ReflowInput* reflowInput = new ReflowInput(
      aPresContext, *aReflowInput.mParentReflowInput, textContainer,
      availSize.ConvertTo(textContainer->GetWritingMode(), lineWM));
    reflowInputs.AppendElement(reflowInput);
    nsLineLayout* lineLayout = new nsLineLayout(aPresContext,
                                                reflowInput->mFloatManager,
                                                reflowInput, nullptr,
                                                aReflowInput.mLineLayout);
    lineLayout->SetSuppressLineWrap(true);
    lineLayouts.AppendElement(lineLayout);

    // Line number is useless for ruby text
    // XXX nullptr here may cause problem, see comments for
    //     nsLineLayout::mBlockRI and nsLineLayout::AddFloat
    lineLayout->Init(nullptr, reflowInput->GetLineHeight(), -1);
    reflowInput->mLineLayout = lineLayout;

    // Border and padding are suppressed on ruby text containers.
    // If the writing mode is vertical-rl, the horizontal position of
    // rt frames will be updated when reflowing this text container,
    // hence leave container size 0 here for now.
    lineLayout->BeginLineReflow(0, 0, reflowInput->ComputedISize(),
                                NS_UNCONSTRAINEDSIZE,
                                false, false, lineWM, nsSize(0, 0));
    lineLayout->AttachRootFrameToBaseLineLayout();
  }

  aReflowInput.mLineLayout->BeginSpan(this, &aReflowInput,
                                      0, aReflowInput.AvailableISize(),
                                      &mBaseline);

  bool allowInitialLineBreak, allowLineBreak;
  GetIsLineBreakAllowed(this, aReflowInput.mLineLayout->LineIsBreakable(),
                        &allowInitialLineBreak, &allowLineBreak);

  nscoord isize = 0;
  // Reflow columns excluding any span
  RubyReflowInput reflowInput = {
    allowInitialLineBreak, allowLineBreak && !hasSpan,
    textContainers, aReflowInput, reflowInputs
  };
  isize = ReflowColumns(reflowInput, aStatus);
  DebugOnly<nscoord> lineSpanSize = aReflowInput.mLineLayout->EndSpan(this);
  aDesiredSize.ISize(lineWM) = isize;
  // When there are no frames inside the ruby base container, EndSpan
  // will return 0. However, in this case, the actual width of the
  // container could be non-zero because of non-empty ruby annotations.
  // XXX When bug 765861 gets fixed, this warning should be upgraded.
  NS_WARNING_ASSERTION(
    NS_INLINE_IS_BREAK(aStatus) || isize == lineSpanSize || mFrames.IsEmpty(),
    "bad isize");

  // If there exists any span, the columns must either be completely
  // reflowed, or be not reflowed at all.
  MOZ_ASSERT(NS_INLINE_IS_BREAK_BEFORE(aStatus) ||
             NS_FRAME_IS_COMPLETE(aStatus) || !hasSpan);
  if (!NS_INLINE_IS_BREAK_BEFORE(aStatus) &&
      NS_FRAME_IS_COMPLETE(aStatus) && hasSpan) {
    // Reflow spans
    RubyReflowInput reflowInput = {
      false, false, textContainers, aReflowInput, reflowInputs
    };
    nscoord spanISize = ReflowSpans(reflowInput);
    isize = std::max(isize, spanISize);
  }

  for (uint32_t i = 0; i < rtcCount; i++) {
    // It happens before the ruby text container is reflowed, and that
    // when it is reflowed, it will just use this size.
    nsRubyTextContainerFrame* textContainer = textContainers[i];
    nsLineLayout* lineLayout = lineLayouts[i].get();

    RubyUtils::ClearReservedISize(textContainer);
    nscoord rtcISize = lineLayout->GetCurrentICoord();
    // Only span containers and containers with collapsed annotations
    // need reserving isize. For normal ruby text containers, their
    // children will be expanded properly. We only need to expand their
    // own size.
    if (!textContainer->IsSpanContainer()) {
      rtcISize = isize;
    } else if (isize > rtcISize) {
      RubyUtils::SetReservedISize(textContainer, isize - rtcISize);
    }

    lineLayout->VerticalAlignLine();
    textContainer->SetISize(rtcISize);
    lineLayout->EndLineReflow();
  }

  // Border and padding are suppressed on ruby base container,
  // create a fake borderPadding for setting BSize.
  WritingMode frameWM = aReflowInput.GetWritingMode();
  LogicalMargin borderPadding(frameWM);
  nsLayoutUtils::SetBSizeFromFontMetrics(this, aDesiredSize,
                                         borderPadding, lineWM, frameWM);
}

/**
 * This struct stores the continuations after this frame and
 * corresponding text containers. It is used to speed up looking
 * ahead for nonempty continuations.
 */
struct MOZ_STACK_CLASS nsRubyBaseContainerFrame::PullFrameState
{
  ContinuationTraversingState mBase;
  AutoTArray<ContinuationTraversingState, RTC_ARRAY_SIZE> mTexts;
  const AutoRubyTextContainerArray& mTextContainers;

  PullFrameState(nsRubyBaseContainerFrame* aBaseContainer,
                 const AutoRubyTextContainerArray& aTextContainers);
};

nscoord
nsRubyBaseContainerFrame::ReflowColumns(const RubyReflowInput& aReflowInput,
                                        nsReflowStatus& aStatus)
{
  nsLineLayout* lineLayout = aReflowInput.mBaseReflowInput.mLineLayout;
  const uint32_t rtcCount = aReflowInput.mTextContainers.Length();
  nscoord icoord = lineLayout->GetCurrentICoord();
  MOZ_ASSERT(icoord == 0, "border/padding of rbc should have been suppressed");
  nsReflowStatus reflowStatus = NS_FRAME_COMPLETE;
  aStatus = NS_FRAME_COMPLETE;

  uint32_t columnIndex = 0;
  RubyColumn column;
  column.mTextFrames.SetCapacity(rtcCount);
  RubyColumnEnumerator e(this, aReflowInput.mTextContainers);
  for (; !e.AtEnd(); e.Next()) {
    e.GetColumn(column);
    icoord += ReflowOneColumn(aReflowInput, columnIndex, column, reflowStatus);
    if (!NS_INLINE_IS_BREAK_BEFORE(reflowStatus)) {
      columnIndex++;
    }
    if (NS_INLINE_IS_BREAK(reflowStatus)) {
      break;
    }
    // We are not handling overflow here.
    MOZ_ASSERT(reflowStatus == NS_FRAME_COMPLETE);
  }

  bool isComplete = false;
  PullFrameState pullFrameState(this, aReflowInput.mTextContainers);
  while (!NS_INLINE_IS_BREAK(reflowStatus)) {
    // We are not handling overflow here.
    MOZ_ASSERT(reflowStatus == NS_FRAME_COMPLETE);

    // Try pull some frames from next continuations. This call replaces
    // frames in |column| with the frame pulled in each level.
    PullOneColumn(lineLayout, pullFrameState, column, isComplete);
    if (isComplete) {
      // No more frames can be pulled.
      break;
    }
    icoord += ReflowOneColumn(aReflowInput, columnIndex, column, reflowStatus);
    if (!NS_INLINE_IS_BREAK_BEFORE(reflowStatus)) {
      columnIndex++;
    }
  }

  if (!e.AtEnd() && NS_INLINE_IS_BREAK_AFTER(reflowStatus)) {
    // The current column has been successfully placed.
    // Skip to the next column and mark break before.
    e.Next();
    e.GetColumn(column);
    reflowStatus = NS_INLINE_LINE_BREAK_BEFORE();
  }
  if (!e.AtEnd() || (GetNextInFlow() && !isComplete)) {
    NS_FRAME_SET_INCOMPLETE(aStatus);
  }

  if (NS_INLINE_IS_BREAK_BEFORE(reflowStatus)) {
    if (!columnIndex || !aReflowInput.mAllowLineBreak) {
      // If no column has been placed yet, or we have any span,
      // the whole container should be in the next line.
      aStatus = NS_INLINE_LINE_BREAK_BEFORE();
      return 0;
    }
    aStatus = NS_INLINE_LINE_BREAK_AFTER(aStatus);
    MOZ_ASSERT(NS_FRAME_IS_COMPLETE(aStatus) || aReflowInput.mAllowLineBreak);

    // If we are on an intra-level whitespace column, null values in
    // column.mBaseFrame and column.mTextFrames don't represent the
    // end of the frame-sibling-chain at that level -- instead, they
    // represent an anonymous empty intra-level whitespace box. It is
    // likely that there are frames in the next column (which can't be
    // intra-level whitespace). Those frames should be pushed as well.
    Maybe<RubyColumn> nextColumn;
    if (column.mIsIntraLevelWhitespace && !e.AtEnd()) {
      e.Next();
      nextColumn.emplace();
      e.GetColumn(nextColumn.ref());
    }
    nsIFrame* baseFrame = column.mBaseFrame;
    if (!baseFrame & nextColumn.isSome()) {
      baseFrame = nextColumn->mBaseFrame;
    }
    if (baseFrame) {
      PushChildren(baseFrame, baseFrame->GetPrevSibling());
    }
    for (uint32_t i = 0; i < rtcCount; i++) {
      nsRubyTextFrame* textFrame = column.mTextFrames[i];
      if (!textFrame && nextColumn.isSome()) {
        textFrame = nextColumn->mTextFrames[i];
      }
      if (textFrame) {
        aReflowInput.mTextContainers[i]->PushChildren(
          textFrame, textFrame->GetPrevSibling());
      }
    }
  } else if (NS_INLINE_IS_BREAK_AFTER(reflowStatus)) {
    // |reflowStatus| being break after here may only happen when
    // there is a break after the column just pulled, or the whole
    // segment has been completely reflowed. In those cases, we do
    // not need to push anything.
    MOZ_ASSERT(e.AtEnd());
    aStatus = NS_INLINE_LINE_BREAK_AFTER(aStatus);
  }

  return icoord;
}

nscoord
nsRubyBaseContainerFrame::ReflowOneColumn(const RubyReflowInput& aReflowInput,
                                          uint32_t aColumnIndex,
                                          const RubyColumn& aColumn,
                                          nsReflowStatus& aStatus)
{
  const ReflowInput& baseReflowInput = aReflowInput.mBaseReflowInput;
  const auto& textReflowInputs = aReflowInput.mTextReflowInputs;
  nscoord istart = baseReflowInput.mLineLayout->GetCurrentICoord();

  if (aColumn.mBaseFrame) {
    bool allowBreakBefore = aColumnIndex ?
      aReflowInput.mAllowLineBreak : aReflowInput.mAllowInitialLineBreak;
    if (allowBreakBefore) {
      gfxBreakPriority breakPriority = LineBreakBefore(
        aColumn.mBaseFrame, baseReflowInput.mRenderingContext->GetDrawTarget(),
        baseReflowInput.mLineLayout->LineContainerFrame(),
        baseReflowInput.mLineLayout->GetLine());
      if (breakPriority != gfxBreakPriority::eNoBreak) {
        gfxBreakPriority lastBreakPriority =
          baseReflowInput.mLineLayout->LastOptionalBreakPriority();
        if (breakPriority >= lastBreakPriority) {
          // Either we have been overflow, or we are forced
          // to break here, do break before.
          if (istart > baseReflowInput.AvailableISize() ||
              baseReflowInput.mLineLayout->NotifyOptionalBreakPosition(
                aColumn.mBaseFrame, 0, true, breakPriority)) {
            aStatus = NS_INLINE_LINE_BREAK_BEFORE();
            return 0;
          }
        }
      }
    }
  }

  const uint32_t rtcCount = aReflowInput.mTextContainers.Length();
  MOZ_ASSERT(aColumn.mTextFrames.Length() == rtcCount);
  MOZ_ASSERT(textReflowInputs.Length() == rtcCount);
  nscoord columnISize = 0;

  nsAutoString baseText;
  if (aColumn.mBaseFrame) {
    nsLayoutUtils::GetFrameTextContent(aColumn.mBaseFrame, baseText);
  }

  // Reflow text frames
  for (uint32_t i = 0; i < rtcCount; i++) {
    nsRubyTextFrame* textFrame = aColumn.mTextFrames[i];
    if (textFrame) {
      nsAutoString annotationText;
      nsLayoutUtils::GetFrameTextContent(textFrame, annotationText);

      // Per CSS Ruby spec, the content comparison for auto-hiding
      // takes place prior to white spaces collapsing (white-space)
      // and text transformation (text-transform), and ignores elements
      // (considers only the textContent of the boxes). Which means
      // using the content tree text comparison is correct.
      if (annotationText.Equals(baseText)) {
        textFrame->AddStateBits(NS_RUBY_TEXT_FRAME_AUTOHIDE);
      } else {
        textFrame->RemoveStateBits(NS_RUBY_TEXT_FRAME_AUTOHIDE);
      }
      RubyUtils::ClearReservedISize(textFrame);

      bool pushedFrame;
      nsReflowStatus reflowStatus;
      nsLineLayout* lineLayout = textReflowInputs[i]->mLineLayout;
      nscoord textIStart = lineLayout->GetCurrentICoord();
      lineLayout->ReflowFrame(textFrame, reflowStatus, nullptr, pushedFrame);
      if (MOZ_UNLIKELY(NS_INLINE_IS_BREAK(reflowStatus) || pushedFrame)) {
        MOZ_ASSERT_UNREACHABLE(
            "Any line break inside ruby box should have been suppressed");
        // For safety, always drain the overflow list, so that
        // no frames are left there after reflow.
        textFrame->DrainSelfOverflowList();
      }
      nscoord textISize = lineLayout->GetCurrentICoord() - textIStart;
      columnISize = std::max(columnISize, textISize);
    }
  }

  // Reflow the base frame
  if (aColumn.mBaseFrame) {
    RubyUtils::ClearReservedISize(aColumn.mBaseFrame);

    bool pushedFrame;
    nsReflowStatus reflowStatus;
    nsLineLayout* lineLayout = baseReflowInput.mLineLayout;
    nscoord baseIStart = lineLayout->GetCurrentICoord();
    lineLayout->ReflowFrame(aColumn.mBaseFrame, reflowStatus,
                            nullptr, pushedFrame);
    if (MOZ_UNLIKELY(NS_INLINE_IS_BREAK(reflowStatus) || pushedFrame)) {
      MOZ_ASSERT_UNREACHABLE(
        "Any line break inside ruby box should have been suppressed");
      // For safety, always drain the overflow list, so that
      // no frames are left there after reflow.
      aColumn.mBaseFrame->DrainSelfOverflowList();
    }
    nscoord baseISize = lineLayout->GetCurrentICoord() - baseIStart;
    columnISize = std::max(columnISize, baseISize);
  }

  // Align all the line layout to the new coordinate.
  nscoord icoord = istart + columnISize;
  nscoord deltaISize = icoord - baseReflowInput.mLineLayout->GetCurrentICoord();
  if (deltaISize > 0) {
    baseReflowInput.mLineLayout->AdvanceICoord(deltaISize);
    if (aColumn.mBaseFrame) {
      RubyUtils::SetReservedISize(aColumn.mBaseFrame, deltaISize);
    }
  }
  for (uint32_t i = 0; i < rtcCount; i++) {
    if (aReflowInput.mTextContainers[i]->IsSpanContainer()) {
      continue;
    }
    nsLineLayout* lineLayout = textReflowInputs[i]->mLineLayout;
    nsRubyTextFrame* textFrame = aColumn.mTextFrames[i];
    nscoord deltaISize = icoord - lineLayout->GetCurrentICoord();
    if (deltaISize > 0) {
      lineLayout->AdvanceICoord(deltaISize);
      if (textFrame && !textFrame->IsAutoHidden()) {
        RubyUtils::SetReservedISize(textFrame, deltaISize);
      }
    }
    if (aColumn.mBaseFrame && textFrame) {
      lineLayout->AttachLastFrameToBaseLineLayout();
    }
  }

  return columnISize;
}

nsRubyBaseContainerFrame::PullFrameState::PullFrameState(
    nsRubyBaseContainerFrame* aBaseContainer,
    const AutoRubyTextContainerArray& aTextContainers)
  : mBase(aBaseContainer)
  , mTextContainers(aTextContainers)
{
  const uint32_t rtcCount = aTextContainers.Length();
  for (uint32_t i = 0; i < rtcCount; i++) {
    mTexts.AppendElement(aTextContainers[i]);
  }
}

void
nsRubyBaseContainerFrame::PullOneColumn(nsLineLayout* aLineLayout,
                                        PullFrameState& aPullFrameState,
                                        RubyColumn& aColumn,
                                        bool& aIsComplete)
{
  const AutoRubyTextContainerArray& textContainers =
    aPullFrameState.mTextContainers;
  const uint32_t rtcCount = textContainers.Length();

  nsIFrame* nextBase = GetNextInFlowChild(aPullFrameState.mBase);
  MOZ_ASSERT(!nextBase || nextBase->GetType() == nsGkAtoms::rubyBaseFrame);
  aColumn.mBaseFrame = static_cast<nsRubyBaseFrame*>(nextBase);
  bool foundFrame = !!aColumn.mBaseFrame;
  bool pullingIntraLevelWhitespace =
    aColumn.mBaseFrame && aColumn.mBaseFrame->IsIntraLevelWhitespace();

  aColumn.mTextFrames.ClearAndRetainStorage();
  for (uint32_t i = 0; i < rtcCount; i++) {
    nsIFrame* nextText =
      textContainers[i]->GetNextInFlowChild(aPullFrameState.mTexts[i]);
    MOZ_ASSERT(!nextText || nextText->GetType() == nsGkAtoms::rubyTextFrame);
    nsRubyTextFrame* textFrame = static_cast<nsRubyTextFrame*>(nextText);
    aColumn.mTextFrames.AppendElement(textFrame);
    foundFrame = foundFrame || nextText;
    if (nextText && !pullingIntraLevelWhitespace) {
      pullingIntraLevelWhitespace = textFrame->IsIntraLevelWhitespace();
    }
  }
  // If there exists any frame in continations, we haven't
  // completed the reflow process.
  aIsComplete = !foundFrame;
  if (!foundFrame) {
    return;
  }

  aColumn.mIsIntraLevelWhitespace = pullingIntraLevelWhitespace;
  if (pullingIntraLevelWhitespace) {
    // We are pulling an intra-level whitespace. Drop all frames which
    // are not part of this intra-level whitespace column. (Those frames
    // are really part of the *next* column, after the pulled one.)
    if (aColumn.mBaseFrame && !aColumn.mBaseFrame->IsIntraLevelWhitespace()) {
      aColumn.mBaseFrame = nullptr;
    }
    for (uint32_t i = 0; i < rtcCount; i++) {
      nsRubyTextFrame*& textFrame = aColumn.mTextFrames[i];
      if (textFrame && !textFrame->IsIntraLevelWhitespace()) {
        textFrame = nullptr;
      }
    }
  } else {
    // We are not pulling an intra-level whitespace, which means all
    // elements we are going to pull can have non-whitespace content,
    // which may contain float which we need to reparent.
    nsBlockFrame* oldFloatCB = nullptr;
    for (nsIFrame* frame : aColumn) {
      oldFloatCB = nsLayoutUtils::GetFloatContainingBlock(frame);
      break;
    }
#ifdef DEBUG
    MOZ_ASSERT(oldFloatCB, "Must have found a float containing block");
    for (nsIFrame* frame : aColumn) {
      MOZ_ASSERT(nsLayoutUtils::GetFloatContainingBlock(frame) == oldFloatCB,
                 "All frames in the same ruby column should share "
                 "the same old float containing block");
    }
#endif
    nsBlockFrame* newFloatCB =
      nsLayoutUtils::GetAsBlock(aLineLayout->LineContainerFrame());
    MOZ_ASSERT(newFloatCB, "Must have a float containing block");
    if (oldFloatCB != newFloatCB) {
      for (nsIFrame* frame : aColumn) {
        newFloatCB->ReparentFloats(frame, oldFloatCB, false);
      }
    }
  }

  // Pull the frames of this column.
  if (aColumn.mBaseFrame) {
    DebugOnly<nsIFrame*> pulled = PullNextInFlowChild(aPullFrameState.mBase);
    MOZ_ASSERT(pulled == aColumn.mBaseFrame, "pulled a wrong frame?");
  }
  for (uint32_t i = 0; i < rtcCount; i++) {
    if (aColumn.mTextFrames[i]) {
      DebugOnly<nsIFrame*> pulled =
        textContainers[i]->PullNextInFlowChild(aPullFrameState.mTexts[i]);
      MOZ_ASSERT(pulled == aColumn.mTextFrames[i], "pulled a wrong frame?");
    }
  }

  if (!aIsComplete) {
    // We pulled frames from the next line, hence mark it dirty.
    aLineLayout->SetDirtyNextLine();
  }
}

nscoord
nsRubyBaseContainerFrame::ReflowSpans(const RubyReflowInput& aReflowInput)
{
  nscoord spanISize = 0;
  for (uint32_t i = 0, iend = aReflowInput.mTextContainers.Length();
       i < iend; i++) {
    nsRubyTextContainerFrame* container = aReflowInput.mTextContainers[i];
    if (!container->IsSpanContainer()) {
      continue;
    }

    nsIFrame* rtFrame = container->PrincipalChildList().FirstChild();
    nsReflowStatus reflowStatus;
    bool pushedFrame;
    nsLineLayout* lineLayout = aReflowInput.mTextReflowInputs[i]->mLineLayout;
    MOZ_ASSERT(lineLayout->GetCurrentICoord() == 0,
               "border/padding of rtc should have been suppressed");
    lineLayout->ReflowFrame(rtFrame, reflowStatus, nullptr, pushedFrame);
    MOZ_ASSERT(!NS_INLINE_IS_BREAK(reflowStatus) && !pushedFrame,
               "Any line break inside ruby box should has been suppressed");
    spanISize = std::max(spanISize, lineLayout->GetCurrentICoord());
  }
  return spanISize;
}