static nscoord
GetAvailableContentISize(const ReflowInput& aReflowInput)
{
  if (aReflowInput.AvailableISize() == NS_INTRINSICSIZE) {
    return NS_INTRINSICSIZE;
  }

  WritingMode wm = aReflowInput.GetWritingMode();
  nscoord borderPaddingISize =
    aReflowInput.ComputedLogicalBorderPadding().IStartEnd(wm);
  return std::max(0, aReflowInput.AvailableISize() - borderPaddingISize);
}
void
nsSimplePageSequenceFrame::SetDesiredSize(ReflowOutput& aDesiredSize,
                                          const ReflowInput& aReflowInput,
                                          nscoord aWidth,
                                          nscoord aHeight)
{
  // Aim to fill the whole size of the document, not only so we
  // can act as a background in print preview but also handle overflow
  // in child page frames correctly.
  // Use availableISize so we don't cause a needless horizontal scrollbar.
  WritingMode wm = aReflowInput.GetWritingMode();
  nscoord scaledWidth = aWidth * PresContext()->GetPrintPreviewScale();
  nscoord scaledHeight = aHeight * PresContext()->GetPrintPreviewScale();

  nscoord scaledISize = (wm.IsVertical() ? scaledHeight : scaledWidth);
  nscoord scaledBSize = (wm.IsVertical() ? scaledWidth : scaledHeight);

  aDesiredSize.ISize(wm) = std::max(scaledISize, aReflowInput.AvailableISize());
  aDesiredSize.BSize(wm) = std::max(scaledBSize, aReflowInput.ComputedBSize());
}
Exemple #3
0
/* virtual */ void
nsRubyFrame::Reflow(nsPresContext* aPresContext,
                    ReflowOutput& aDesiredSize,
                    const ReflowInput& aReflowInput,
                    nsReflowStatus& aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsRubyFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  
  if (!aReflowInput.mLineLayout) {
    NS_ASSERTION(aReflowInput.mLineLayout,
                 "No line layout provided to RubyFrame reflow method.");
    aStatus = NS_FRAME_COMPLETE;
    return;
  }

  // Grab overflow frames from prev-in-flow and its own.
  MoveOverflowToChildList();

  // Clear leadings
  mBStartLeading = mBEndLeading = 0;

  // Begin the span for the ruby frame
  WritingMode frameWM = aReflowInput.GetWritingMode();
  WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
  LogicalMargin borderPadding = aReflowInput.ComputedLogicalBorderPadding();
  nscoord startEdge = 0;
  const bool boxDecorationBreakClone =
    StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Clone;
  if (boxDecorationBreakClone || !GetPrevContinuation()) {
    startEdge = borderPadding.IStart(frameWM);
  }
  NS_ASSERTION(aReflowInput.AvailableISize() != NS_UNCONSTRAINEDSIZE,
               "should no longer use available widths");
  nscoord availableISize = aReflowInput.AvailableISize();
  availableISize -= startEdge + borderPadding.IEnd(frameWM);
  aReflowInput.mLineLayout->BeginSpan(this, &aReflowInput,
                                      startEdge, availableISize, &mBaseline);

  aStatus = NS_FRAME_COMPLETE;
  for (RubySegmentEnumerator e(this); !e.AtEnd(); e.Next()) {
    ReflowSegment(aPresContext, aReflowInput, e.GetBaseContainer(), aStatus);

    if (NS_INLINE_IS_BREAK(aStatus)) {
      // A break occurs when reflowing the segment.
      // Don't continue reflowing more segments.
      break;
    }
  }

  ContinuationTraversingState pullState(this);
  while (aStatus == NS_FRAME_COMPLETE) {
    nsRubyBaseContainerFrame* baseContainer =
      PullOneSegment(aReflowInput.mLineLayout, pullState);
    if (!baseContainer) {
      // No more continuations after, finish now.
      break;
    }
    ReflowSegment(aPresContext, aReflowInput, baseContainer, aStatus);
  }
  // We never handle overflow in ruby.
  MOZ_ASSERT(!NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus));

  aDesiredSize.ISize(lineWM) = aReflowInput.mLineLayout->EndSpan(this);
  if (boxDecorationBreakClone || !GetPrevContinuation()) {
    aDesiredSize.ISize(lineWM) += borderPadding.IStart(frameWM);
  }
  if (boxDecorationBreakClone || NS_FRAME_IS_COMPLETE(aStatus)) {
    aDesiredSize.ISize(lineWM) += borderPadding.IEnd(frameWM);
  }

  nsLayoutUtils::SetBSizeFromFontMetrics(this, aDesiredSize,
                                         borderPadding, lineWM, frameWM);
}
Exemple #4
0
void
nsRubyFrame::ReflowSegment(nsPresContext* aPresContext,
                           const ReflowInput& aReflowInput,
                           nsRubyBaseContainerFrame* aBaseContainer,
                           nsReflowStatus& aStatus)
{
  WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
  LogicalSize availSize(lineWM, aReflowInput.AvailableISize(),
                        aReflowInput.AvailableBSize());
  WritingMode rubyWM = GetWritingMode();
  NS_ASSERTION(!rubyWM.IsOrthogonalTo(lineWM),
               "Ruby frame writing-mode shouldn't be orthogonal to its line");

  AutoRubyTextContainerArray textContainers(aBaseContainer);
  const uint32_t rtcCount = textContainers.Length();

  ReflowOutput baseMetrics(aReflowInput);
  bool pushedFrame;
  aReflowInput.mLineLayout->ReflowFrame(aBaseContainer, aStatus,
                                        &baseMetrics, pushedFrame);

  if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) {
    if (aBaseContainer != mFrames.FirstChild()) {
      // Some segments may have been reflowed before, hence it is not
      // a break-before for the ruby container.
      aStatus = NS_INLINE_LINE_BREAK_AFTER(NS_FRAME_NOT_COMPLETE);
      PushChildren(aBaseContainer, aBaseContainer->GetPrevSibling());
      aReflowInput.mLineLayout->SetDirtyNextLine();
    }
    // This base container is not placed at all, we can skip all
    // text containers paired with it.
    return;
  }
  if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
    // It always promise that if the status is incomplete, there is a
    // break occurs. Break before has been processed above. However,
    // it is possible that break after happens with the frame reflow
    // completed. It happens if there is a force break at the end.
    MOZ_ASSERT(NS_INLINE_IS_BREAK_AFTER(aStatus));
    // Find the previous sibling which we will
    // insert new continuations after.
    nsIFrame* lastChild;
    if (rtcCount > 0) {
      lastChild = textContainers.LastElement();
    } else {
      lastChild = aBaseContainer;
    }

    // Create continuations for the base container
    nsIFrame* newBaseContainer = CreateNextInFlow(aBaseContainer);
    // newBaseContainer is null if there are existing next-in-flows.
    // We only need to move and push if there were not.
    if (newBaseContainer) {
      // Move the new frame after all the text containers
      mFrames.RemoveFrame(newBaseContainer);
      mFrames.InsertFrame(nullptr, lastChild, newBaseContainer);

      // Create continuations for text containers
      nsIFrame* newLastChild = newBaseContainer;
      for (uint32_t i = 0; i < rtcCount; i++) {
        nsIFrame* newTextContainer = CreateNextInFlow(textContainers[i]);
        MOZ_ASSERT(newTextContainer, "Next-in-flow of rtc should not exist "
                   "if the corresponding rbc does not");
        mFrames.RemoveFrame(newTextContainer);
        mFrames.InsertFrame(nullptr, newLastChild, newTextContainer);
        newLastChild = newTextContainer;
      }
    }
    if (lastChild != mFrames.LastChild()) {
      // Always push the next frame after the last child in this segment.
      // It is possible that we pulled it back before our next-in-flow
      // drain our overflow.
      PushChildren(lastChild->GetNextSibling(), lastChild);
      aReflowInput.mLineLayout->SetDirtyNextLine();
    }
  } else {
    // If the ruby base container is reflowed completely, the line
    // layout will remove the next-in-flows of that frame. But the
    // line layout is not aware of the ruby text containers, hence
    // it is necessary to remove them here.
    for (uint32_t i = 0; i < rtcCount; i++) {
      nsIFrame* nextRTC = textContainers[i]->GetNextInFlow();
      if (nextRTC) {
        nextRTC->GetParent()->DeleteNextInFlowChild(nextRTC, true);
      }
    }
  }

  nscoord segmentISize = baseMetrics.ISize(lineWM);
  const nsSize dummyContainerSize;
  LogicalRect baseRect =
    aBaseContainer->GetLogicalRect(lineWM, dummyContainerSize);
  // We need to position our rtc frames on one side or the other of the
  // base container's rect, using a coordinate space that's relative to
  // the ruby frame. Right now, the base container's rect's block-axis
  // position is relative to the block container frame containing the
  // lines, so we use 0 instead. (i.e. we assume that the base container
  // is adjacent to the ruby frame's block-start edge.)
  // XXX We may need to add border/padding here. See bug 1055667.
  baseRect.BStart(lineWM) = 0;
  // The rect for offsets of text containers.
  LogicalRect offsetRect = baseRect;
  for (uint32_t i = 0; i < rtcCount; i++) {
    nsRubyTextContainerFrame* textContainer = textContainers[i];
    WritingMode rtcWM = textContainer->GetWritingMode();
    nsReflowStatus textReflowStatus;
    ReflowOutput textMetrics(aReflowInput);
    ReflowInput textReflowInput(aPresContext, aReflowInput, textContainer,
                                      availSize.ConvertTo(rtcWM, lineWM));
    // FIXME We probably shouldn't be using the same nsLineLayout for
    //       the text containers. But it should be fine now as we are
    //       not actually using this line layout to reflow something,
    //       but just read the writing mode from it.
    textReflowInput.mLineLayout = aReflowInput.mLineLayout;
    textContainer->Reflow(aPresContext, textMetrics,
                          textReflowInput, textReflowStatus);
    // Ruby text containers always return NS_FRAME_COMPLETE even when
    // they have continuations, because the breaking has already been
    // handled when reflowing the base containers.
    NS_ASSERTION(textReflowStatus == NS_FRAME_COMPLETE,
                 "Ruby text container must not break itself inside");
    // The metrics is initialized with reflow state of this ruby frame,
    // hence the writing-mode is tied to rubyWM instead of rtcWM.
    LogicalSize size = textMetrics.Size(rubyWM).ConvertTo(lineWM, rubyWM);
    textContainer->SetSize(lineWM, size);

    nscoord reservedISize = RubyUtils::GetReservedISize(textContainer);
    segmentISize = std::max(segmentISize, size.ISize(lineWM) + reservedISize);

    uint8_t rubyPosition = textContainer->StyleText()->mRubyPosition;
    MOZ_ASSERT(rubyPosition == NS_STYLE_RUBY_POSITION_OVER ||
               rubyPosition == NS_STYLE_RUBY_POSITION_UNDER);
    Maybe<LogicalSide> side;
    if (rubyPosition == NS_STYLE_RUBY_POSITION_OVER) {
      side.emplace(lineWM.LogicalSideForLineRelativeDir(eLineRelativeDirOver));
    } else if (rubyPosition == NS_STYLE_RUBY_POSITION_UNDER) {
      side.emplace(lineWM.LogicalSideForLineRelativeDir(eLineRelativeDirUnder));
    } else {
      // XXX inter-character support in bug 1055672
      MOZ_ASSERT_UNREACHABLE("Unsupported ruby-position");
    }

    LogicalPoint position(lineWM);
    if (side.isSome()) {
      if (side.value() == eLogicalSideBStart) {
        offsetRect.BStart(lineWM) -= size.BSize(lineWM);
        offsetRect.BSize(lineWM) += size.BSize(lineWM);
        position = offsetRect.Origin(lineWM);
      } else if (side.value() == eLogicalSideBEnd) {
        position = offsetRect.Origin(lineWM) +
          LogicalPoint(lineWM, 0, offsetRect.BSize(lineWM));
        offsetRect.BSize(lineWM) += size.BSize(lineWM);
      } else {
        MOZ_ASSERT_UNREACHABLE("???");
      }
    }
    // Using a dummy container-size here, so child positioning may not be
    // correct. We will fix it in nsLineLayout after the whole line is
    // reflowed.
    FinishReflowChild(textContainer, aPresContext, textMetrics,
                      &textReflowInput, lineWM, position, dummyContainerSize, 0);
  }
  MOZ_ASSERT(baseRect.ISize(lineWM) == offsetRect.ISize(lineWM),
             "Annotations should only be placed on the block directions");

  nscoord deltaISize = segmentISize - baseMetrics.ISize(lineWM);
  if (deltaISize <= 0) {
    RubyUtils::ClearReservedISize(aBaseContainer);
  } else {
    RubyUtils::SetReservedISize(aBaseContainer, deltaISize);
    aReflowInput.mLineLayout->AdvanceICoord(deltaISize);
  }

  // Set block leadings of the base container
  nscoord startLeading = baseRect.BStart(lineWM) - offsetRect.BStart(lineWM);
  nscoord endLeading = offsetRect.BEnd(lineWM) - baseRect.BEnd(lineWM);
  // XXX When bug 765861 gets fixed, this warning should be upgraded.
  NS_WARNING_ASSERTION(startLeading >= 0 && endLeading >= 0,
                       "Leadings should be non-negative (because adding "
                       "ruby annotation can only increase the size)");
  mBStartLeading = std::max(mBStartLeading, startLeading);
  mBEndLeading = std::max(mBEndLeading, endLeading);
}
Exemple #5
0
void
nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
                            const ReflowInput& aReflowInput,
                            InlineReflowInput& irs,
                            ReflowOutput& aMetrics,
                            nsReflowStatus& aStatus)
{
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

  nsLineLayout* lineLayout = aReflowInput.mLineLayout;
  bool inFirstLine = aReflowInput.mLineLayout->GetInFirstLine();
  RestyleManager* restyleManager = aPresContext->RestyleManager();
  WritingMode frameWM = aReflowInput.GetWritingMode();
  WritingMode lineWM = aReflowInput.mLineLayout->mRootSpan->mWritingMode;
  LogicalMargin framePadding = aReflowInput.ComputedLogicalBorderPadding();
  nscoord startEdge = 0;
  const bool boxDecorationBreakClone =
    MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
                   StyleBoxDecorationBreak::Clone);
  // Don't offset by our start borderpadding if we have a prev continuation or
  // if we're in a part of an {ib} split other than the first one. For
  // box-decoration-break:clone we always offset our start since all
  // continuations have border/padding.
  if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) ||
      boxDecorationBreakClone) {
    startEdge = framePadding.IStart(frameWM);
  }
  nscoord availableISize = aReflowInput.AvailableISize();
  NS_ASSERTION(availableISize != NS_UNCONSTRAINEDSIZE,
               "should no longer use available widths");
  // Subtract off inline axis border+padding from availableISize
  availableISize -= startEdge;
  availableISize -= framePadding.IEnd(frameWM);
  lineLayout->BeginSpan(this, &aReflowInput, startEdge,
                        startEdge + availableISize, &mBaseline);

  // First reflow our principal children.
  nsIFrame* frame = mFrames.FirstChild();
  bool done = false;
  while (frame) {
    // Check if we should lazily set the child frame's parent pointer.
    if (irs.mSetParentPointer) {
      nsIFrame* child = frame;
      do {
        child->SetParent(this);
        if (inFirstLine) {
          restyleManager->ReparentStyleContext(child);
          nsLayoutUtils::MarkDescendantsDirty(child);
        }
        // We also need to do the same for |frame|'s next-in-flows that are in
        // the sibling list. Otherwise, if we reflow |frame| and it's complete
        // we'll crash when trying to delete its next-in-flow.
        // This scenario doesn't happen often, but it can happen.
        nsIFrame* nextSibling = child->GetNextSibling();
        child = child->GetNextInFlow();
        if (MOZ_UNLIKELY(child)) {
          while (child != nextSibling && nextSibling) {
            nextSibling = nextSibling->GetNextSibling();
          }
          if (!nextSibling) {
            child = nullptr;
          }
        }
        MOZ_ASSERT(!child || mFrames.ContainsFrame(child));
      } while (child);

      // Fix the parent pointer for ::first-letter child frame next-in-flows,
      // so nsFirstLetterFrame::Reflow can destroy them safely (bug 401042).
      nsIFrame* realFrame = nsPlaceholderFrame::GetRealFrameFor(frame);
      if (realFrame->IsLetterFrame()) {
        nsIFrame* child = realFrame->PrincipalChildList().FirstChild();
        if (child) {
          NS_ASSERTION(child->IsTextFrame(), "unexpected frame type");
          nsIFrame* nextInFlow = child->GetNextInFlow();
          for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
            NS_ASSERTION(nextInFlow->IsTextFrame(), "unexpected frame type");
            if (mFrames.ContainsFrame(nextInFlow)) {
              nextInFlow->SetParent(this);
              if (inFirstLine) {
                restyleManager->ReparentStyleContext(nextInFlow);
                nsLayoutUtils::MarkDescendantsDirty(nextInFlow);
              }
            }
            else {
#ifdef DEBUG
              // Once we find a next-in-flow that isn't ours none of the
              // remaining next-in-flows should be either.
              for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
                NS_ASSERTION(!mFrames.ContainsFrame(nextInFlow),
                             "unexpected letter frame flow");
              }
#endif
              break;
            }
          }
        }
      }
    }
    MOZ_ASSERT(frame->GetParent() == this);

    if (!done) {
      bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
      ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus);
      done = aStatus.IsInlineBreak() ||
             (!reflowingFirstLetter && aStatus.IsIncomplete());
      if (done) {
        if (!irs.mSetParentPointer) {
          break;
        }
        // Keep reparenting the remaining siblings, but don't reflow them.
        nsFrameList* pushedFrames = GetOverflowFrames();
        if (pushedFrames && pushedFrames->FirstChild() == frame) {
          // Don't bother if |frame| was pushed to our overflow list.
          break;
        }
      } else {
        irs.mPrevFrame = frame;
      }
    }
    frame = frame->GetNextSibling();
  }

  // Attempt to pull frames from our next-in-flow until we can't
  if (!done && GetNextInFlow()) {
    while (true) {
      bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
      bool isComplete;
      if (!frame) { // Could be non-null if we pulled a first-letter frame and
                    // it created a continuation, since we don't push those.
        frame = PullOneFrame(aPresContext, irs, &isComplete);
      }
#ifdef NOISY_PUSHING
      printf("%p pulled up %p\n", this, frame);
#endif
      if (nullptr == frame) {
        if (!isComplete) {
          aStatus.Reset();
          aStatus.SetIncomplete();
        }
        break;
      }
      ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus);
      if (aStatus.IsInlineBreak() ||
          (!reflowingFirstLetter && aStatus.IsIncomplete())) {
        break;
      }
      irs.mPrevFrame = frame;
      frame = frame->GetNextSibling();
    }
  }

  NS_ASSERTION(!aStatus.IsComplete() || !GetOverflowFrames(),
               "We can't be complete AND have overflow frames!");

  // If after reflowing our children they take up no area then make
  // sure that we don't either.
  //
  // Note: CSS demands that empty inline elements still affect the
  // line-height calculations. However, continuations of an inline
  // that are empty we force to empty so that things like collapsed
  // whitespace in an inline element don't affect the line-height.
  aMetrics.ISize(lineWM) = lineLayout->EndSpan(this);

  // Compute final width.

  // XXX Note that that the padding start and end are in the frame's
  //     writing mode, but the metrics' inline-size is in the line's
  //     writing mode. This makes sense if the line and frame are both
  //     vertical or both horizontal, but what should happen with
  //     orthogonal inlines?

  // Make sure to not include our start border and padding if we have a prev
  // continuation or if we're in a part of an {ib} split other than the first
  // one.  For box-decoration-break:clone we always include our start border
  // and padding since all continuations have them.
  if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) ||
      boxDecorationBreakClone) {
    aMetrics.ISize(lineWM) += framePadding.IStart(frameWM);
  }

  /*
   * We want to only apply the end border and padding if we're the last
   * continuation and either not in an {ib} split or the last part of it.  To
   * be the last continuation we have to be complete (so that we won't get a
   * next-in-flow) and have no non-fluid continuations on our continuation
   * chain.  For box-decoration-break:clone we always apply the end border and
   * padding since all continuations have them.
   */
  if ((aStatus.IsComplete() &&
       !LastInFlow()->GetNextContinuation() &&
       !FrameIsNonLastInIBSplit()) ||
      boxDecorationBreakClone) {
    aMetrics.ISize(lineWM) += framePadding.IEnd(frameWM);
  }

  nsLayoutUtils::SetBSizeFromFontMetrics(this, aMetrics,
                                         framePadding, lineWM, frameWM);

  // For now our overflow area is zero. The real value will be
  // computed in |nsLineLayout::RelativePositionFrames|.
  aMetrics.mOverflowAreas.Clear();

#ifdef NOISY_FINAL_SIZE
  ListTag(stdout);
  printf(": metrics=%d,%d ascent=%d\n",
         aMetrics.Width(), aMetrics.Height(), aMetrics.TopAscent());
#endif
}
void
ViewportFrame::Reflow(nsPresContext*           aPresContext,
                      ReflowOutput&     aDesiredSize,
                      const ReflowInput& aReflowInput,
                      nsReflowStatus&          aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("ViewportFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  NS_FRAME_TRACE_REFLOW_IN("ViewportFrame::Reflow");

  // Initialize OUT parameters
  aStatus = NS_FRAME_COMPLETE;

  // Because |Reflow| sets ComputedBSize() on the child to our
  // ComputedBSize().
  AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);

  // Set our size up front, since some parts of reflow depend on it
  // being already set.  Note that the computed height may be
  // unconstrained; that's ok.  Consumers should watch out for that.
  SetSize(nsSize(aReflowInput.ComputedWidth(), aReflowInput.ComputedHeight()));

  // Reflow the main content first so that the placeholders of the
  // fixed-position frames will be in the right places on an initial
  // reflow.
  nscoord kidBSize = 0;
  WritingMode wm = aReflowInput.GetWritingMode();

  if (mFrames.NotEmpty()) {
    // Deal with a non-incremental reflow or an incremental reflow
    // targeted at our one-and-only principal child frame.
    if (aReflowInput.ShouldReflowAllKids() ||
        aReflowInput.IsBResize() ||
        NS_SUBTREE_DIRTY(mFrames.FirstChild())) {
      // Reflow our one-and-only principal child frame
      nsIFrame*           kidFrame = mFrames.FirstChild();
      ReflowOutput kidDesiredSize(aReflowInput);
      WritingMode         wm = kidFrame->GetWritingMode();
      LogicalSize         availableSpace = aReflowInput.AvailableSize(wm);
      ReflowInput   kidReflowInput(aPresContext, aReflowInput,
                                         kidFrame, availableSpace);

      // Reflow the frame
      kidReflowInput.SetComputedBSize(aReflowInput.ComputedBSize());
      ReflowChild(kidFrame, aPresContext, kidDesiredSize, kidReflowInput,
                  0, 0, 0, aStatus);
      kidBSize = kidDesiredSize.BSize(wm);

      FinishReflowChild(kidFrame, aPresContext, kidDesiredSize, nullptr, 0, 0, 0);
    } else {
      kidBSize = LogicalSize(wm, mFrames.FirstChild()->GetSize()).BSize(wm);
    }
  }

  NS_ASSERTION(aReflowInput.AvailableISize() != NS_UNCONSTRAINEDSIZE,
               "shouldn't happen anymore");

  // Return the max size as our desired size
  LogicalSize maxSize(wm, aReflowInput.AvailableISize(),
                      // Being flowed initially at an unconstrained block size
                      // means we should return our child's intrinsic size.
                      aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE
                        ? aReflowInput.ComputedBSize()
                        : kidBSize);
  aDesiredSize.SetSize(wm, maxSize);
  aDesiredSize.SetOverflowAreasToDesiredBounds();

  if (HasAbsolutelyPositionedChildren()) {
    // Make a copy of the reflow state and change the computed width and height
    // to reflect the available space for the fixed items
    ReflowInput reflowInput(aReflowInput);

    if (reflowInput.AvailableBSize() == NS_UNCONSTRAINEDSIZE) {
      // We have an intrinsic-height document with abs-pos/fixed-pos children.
      // Set the available height and mComputedHeight to our chosen height.
      reflowInput.AvailableBSize() = maxSize.BSize(wm);
      // Not having border/padding simplifies things
      NS_ASSERTION(reflowInput.ComputedPhysicalBorderPadding() == nsMargin(0,0,0,0),
                   "Viewports can't have border/padding");
      reflowInput.SetComputedBSize(maxSize.BSize(wm));
    }

    nsRect rect = AdjustReflowInputAsContainingBlock(&reflowInput);
    nsOverflowAreas* overflowAreas = &aDesiredSize.mOverflowAreas;
    nsIScrollableFrame* rootScrollFrame =
                    aPresContext->PresShell()->GetRootScrollFrameAsScrollable();
    if (rootScrollFrame && !rootScrollFrame->IsIgnoringViewportClipping()) {
      overflowAreas = nullptr;
    }
    AbsPosReflowFlags flags =
      AbsPosReflowFlags::eCBWidthAndHeightChanged; // XXX could be optimized
    GetAbsoluteContainingBlock()->Reflow(this, aPresContext, reflowInput, aStatus,
                                         rect, flags, overflowAreas);
  }

  if (mFrames.NotEmpty()) {
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, mFrames.FirstChild());
  }

  // If we were dirty then do a repaint
  if (GetStateBits() & NS_FRAME_IS_DIRTY) {
    InvalidateFrame();
  }

  // Clipping is handled by the document container (e.g., nsSubDocumentFrame),
  // so we don't need to change our overflow areas.
  bool overflowChanged = FinishAndStoreOverflow(&aDesiredSize);
  if (overflowChanged) {
    // We may need to alert our container to get it to pick up the
    // overflow change.
    nsSubDocumentFrame* container = static_cast<nsSubDocumentFrame*>
      (nsLayoutUtils::GetCrossDocParentFrame(this));
    if (container && !container->ShouldClipSubdocument()) {
      container->PresContext()->PresShell()->
        FrameNeedsReflow(container, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
    }
  }

  NS_FRAME_TRACE_REFLOW_OUT("ViewportFrame::Reflow", aStatus);
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
void
nsTableCellFrame::Reflow(nsPresContext*           aPresContext,
                         ReflowOutput&     aDesiredSize,
                         const ReflowInput& aReflowInput,
                         nsReflowStatus&          aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsTableCellFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);

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

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

  aStatus = NS_FRAME_COMPLETE;
  WritingMode wm = aReflowInput.GetWritingMode();
  LogicalSize availSize(wm, aReflowInput.AvailableISize(),
                            aReflowInput.AvailableBSize());

  LogicalMargin borderPadding = aReflowInput.ComputedLogicalPadding();
  LogicalMargin border = GetBorderWidth(wm);
  borderPadding += border;

  // reduce available space by insets, if we're in a constrained situation
  availSize.ISize(wm) -= borderPadding.IStartEnd(wm);
  if (NS_UNCONSTRAINEDSIZE != availSize.BSize(wm)) {
    availSize.BSize(wm) -= borderPadding.BStartEnd(wm);
  }

  // Try to reflow the child into the available space. It might not
  // fit or might need continuing.
  if (availSize.BSize(wm) < 0) {
    availSize.BSize(wm) = 1;
  }

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

  if (aReflowInput.mFlags.mSpecialBSizeReflow) {
    const_cast<ReflowInput&>(aReflowInput).
      SetComputedBSize(BSize(wm) - borderPadding.BStartEnd(wm));
    DISPLAY_REFLOW_CHANGE();
  }
  else if (aPresContext->IsPaginated()) {
    nscoord computedUnpaginatedBSize =
      CalcUnpaginatedBSize((nsTableCellFrame&)*this,
                           *tableFrame, borderPadding.BStartEnd(wm));
    if (computedUnpaginatedBSize > 0) {
      const_cast<ReflowInput&>(aReflowInput).SetComputedBSize(computedUnpaginatedBSize);
      DISPLAY_REFLOW_CHANGE();
    }
  }
  else {
    SetHasPctOverBSize(false);
  }

  WritingMode kidWM = firstKid->GetWritingMode();
  ReflowInput kidReflowInput(aPresContext, aReflowInput, firstKid,
                                   availSize.ConvertTo(kidWM, wm));

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

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

  nsSize containerSize =
    aReflowInput.ComputedSizeAsContainerIfConstrained();

  LogicalPoint kidOrigin(wm, borderPadding.IStart(wm),
                         borderPadding.BStart(wm));
  nsRect origRect = firstKid->GetRect();
  nsRect origVisualOverflow = firstKid->GetVisualOverflowRect();
  bool firstReflow = firstKid->HasAnyStateBits(NS_FRAME_FIRST_REFLOW);

  ReflowChild(firstKid, aPresContext, kidSize, kidReflowInput,
              wm, kidOrigin, containerSize, 0, aStatus);
  if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus)) {
    // Don't pass OVERFLOW_INCOMPLETE through tables until they can actually handle it
    //XXX should paginate overflow as overflow, but not in this patch (bug 379349)
    NS_FRAME_SET_INCOMPLETE(aStatus);
    printf("Set table cell incomplete %p\n", static_cast<void*>(this));
  }

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

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

  // 0 dimensioned cells need to be treated specially in Standard/NavQuirks mode
  // see testcase "emptyCells.html"
  nsIFrame* prevInFlow = GetPrevInFlow();
  bool isEmpty;
  if (prevInFlow) {
    isEmpty = static_cast<nsTableCellFrame*>(prevInFlow)->GetContentEmpty();
  } else {
    isEmpty = !CellHasVisibleContent(kidSize.Height(), tableFrame, firstKid);
  }
  SetContentEmpty(isEmpty);

  // Place the child
  FinishReflowChild(firstKid, aPresContext, kidSize, &kidReflowInput,
                    wm, kidOrigin, containerSize, 0);

  nsTableFrame::InvalidateTableFrame(firstKid, origRect, origVisualOverflow,
                                     firstReflow);

  // first, compute the bsize which can be set w/o being restricted by
  // available bsize
  LogicalSize cellSize(wm);
  cellSize.BSize(wm) = kidSize.BSize(wm);

  if (NS_UNCONSTRAINEDSIZE != cellSize.BSize(wm)) {
    cellSize.BSize(wm) += borderPadding.BStartEnd(wm);
  }

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

  // factor in border and padding
  if (NS_UNCONSTRAINEDSIZE != cellSize.ISize(wm)) {
    cellSize.ISize(wm) += borderPadding.IStartEnd(wm);
  }

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

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

  if (aReflowInput.mFlags.mSpecialBSizeReflow) {
    if (aDesiredSize.BSize(wm) > BSize(wm)) {
      // set a bit indicating that the pct bsize contents exceeded
      // the height that they could honor in the pass 2 reflow
      SetHasPctOverBSize(true);
    }
    if (NS_UNCONSTRAINEDSIZE == aReflowInput.AvailableBSize()) {
      aDesiredSize.BSize(wm) = BSize(wm);
    }
  }

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

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

  // Any absolutely-positioned children will get reflowed in
  // 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);
}
bool
nsColumnSetFrame::ReflowChildren(ReflowOutput&     aDesiredSize,
                                 const ReflowInput& aReflowInput,
                                 nsReflowStatus&          aStatus,
                                 const ReflowConfig&      aConfig,
                                 bool                     aUnboundedLastColumn,
                                 nsCollapsingMargin*      aCarriedOutBEndMargin,
                                 ColumnBalanceData&       aColData)
{
  aColData.Reset();
  bool allFit = true;
  WritingMode wm = GetWritingMode();
  bool isVertical = wm.IsVertical();
  bool isRTL = !wm.IsBidiLTR();
  bool shrinkingBSizeOnly = !NS_SUBTREE_DIRTY(this) &&
    mLastBalanceBSize > aConfig.mColMaxBSize;

#ifdef DEBUG_roc
  printf("*** Doing column reflow pass: mLastBalanceBSize=%d, mColMaxBSize=%d, RTL=%d\n"
         "    mBalanceColCount=%d, mColISize=%d, mColGap=%d\n",
         mLastBalanceBSize, aConfig.mColMaxBSize, isRTL, aConfig.mBalanceColCount,
         aConfig.mColISize, aConfig.mColGap);
#endif

  DrainOverflowColumns();

  const bool colBSizeChanged = mLastBalanceBSize != aConfig.mColMaxBSize;

  if (colBSizeChanged) {
    mLastBalanceBSize = aConfig.mColMaxBSize;
    // XXX Seems like this could fire if incremental reflow pushed the column set
    // down so we reflow incrementally with a different available height.
    // We need a way to do an incremental reflow and be sure availableHeight
    // changes are taken account of! Right now I think block frames with absolute
    // children might exit early.
    //NS_ASSERTION(aKidReason != eReflowReason_Incremental,
    //             "incremental reflow should not have changed the balance height");
  }

  // get our border and padding
  LogicalMargin borderPadding = aReflowInput.ComputedLogicalBorderPadding();
  borderPadding.ApplySkipSides(GetLogicalSkipSides(&aReflowInput));

  nsRect contentRect(0, 0, 0, 0);
  nsOverflowAreas overflowRects;

  nsIFrame* child = mFrames.FirstChild();
  LogicalPoint childOrigin(wm, borderPadding.IStart(wm),
                           borderPadding.BStart(wm));
  // In vertical-rl mode, columns will not be correctly placed if the
  // reflowInput's ComputedWidth() is UNCONSTRAINED (in which case we'll get
  // a containerSize.width of zero here). In that case, the column positions
  // will be adjusted later, after our correct contentSize is known.
  nsSize containerSize = aReflowInput.ComputedSizeAsContainerIfConstrained();

  // For RTL, since the columns might not fill the frame exactly, we
  // need to account for the slop. Otherwise we'll waste time moving the
  // columns by some tiny amount

  // XXX when all of layout is converted to logical coordinates, we
  //     probably won't need to do this hack any more. For now, we
  //     confine it to the legacy horizontal-rl case
  if (!isVertical && isRTL) {
    nscoord availISize = aReflowInput.AvailableISize();
    if (aReflowInput.ComputedISize() != NS_INTRINSICSIZE) {
      availISize = aReflowInput.ComputedISize();
    }
    if (availISize != NS_INTRINSICSIZE) {
      childOrigin.I(wm) = containerSize.width - borderPadding.Left(wm) -
                          availISize;
#ifdef DEBUG_roc
      printf("*** childOrigin.iCoord = %d\n", childOrigin.I(wm));
#endif
    }
  }

  int columnCount = 0;
  int contentBEnd = 0;
  bool reflowNext = false;

  while (child) {
    // Try to skip reflowing the child. We can't skip if the child is dirty. We also can't
    // skip if the next column is dirty, because the next column's first line(s)
    // might be pullable back to this column. We can't skip if it's the last child
    // because we need to obtain the bottom margin. We can't skip
    // if this is the last column and we're supposed to assign unbounded
    // height to it, because that could change the available height from
    // the last time we reflowed it and we should try to pull all the
    // content from its next sibling. (Note that it might be the last
    // column, but not be the last child because the desired number of columns
    // has changed.)
    bool skipIncremental = !aReflowInput.ShouldReflowAllKids()
      && !NS_SUBTREE_DIRTY(child)
      && child->GetNextSibling()
      && !(aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1)
      && !NS_SUBTREE_DIRTY(child->GetNextSibling());
    // If we need to pull up content from the prev-in-flow then this is not just
    // a height shrink. The prev in flow will have set the dirty bit.
    // Check the overflow rect YMost instead of just the child's content height. The child
    // may have overflowing content that cares about the available height boundary.
    // (It may also have overflowing content that doesn't care about the available height
    // boundary, but if so, too bad, this optimization is defeated.)
    // We want scrollable overflow here since this is a calculation that
    // affects layout.
    bool skipResizeBSizeShrink = false;
    if (shrinkingBSizeOnly) {
      switch (wm.GetBlockDir()) {
      case WritingMode::eBlockTB:
        if (child->GetScrollableOverflowRect().YMost() <= aConfig.mColMaxBSize) {
          skipResizeBSizeShrink = true;
        }
        break;
      case WritingMode::eBlockLR:
        if (child->GetScrollableOverflowRect().XMost() <= aConfig.mColMaxBSize) {
          skipResizeBSizeShrink = true;
        }
        break;
      case WritingMode::eBlockRL:
        // XXX not sure how to handle this, so for now just don't attempt
        // the optimization
        break;
      default:
        NS_NOTREACHED("unknown block direction");
        break;
      }
    }

    nscoord childContentBEnd = 0;
    if (!reflowNext && (skipIncremental || skipResizeBSizeShrink)) {
      // This child does not need to be reflowed, but we may need to move it
      MoveChildTo(child, childOrigin, wm, containerSize);

      // If this is the last frame then make sure we get the right status
      nsIFrame* kidNext = child->GetNextSibling();
      if (kidNext) {
        aStatus = (kidNext->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)
                  ? NS_FRAME_OVERFLOW_INCOMPLETE
                  : NS_FRAME_NOT_COMPLETE;
      } else {
        aStatus = mLastFrameStatus;
      }
      childContentBEnd = nsLayoutUtils::CalculateContentBEnd(wm, child);
#ifdef DEBUG_roc
      printf("*** Skipping child #%d %p (incremental %d, resize block-size shrink %d): status = %d\n",
             columnCount, (void*)child, skipIncremental, skipResizeBSizeShrink, aStatus);
#endif
    } else {
      LogicalSize availSize(wm, aConfig.mColISize, aConfig.mColMaxBSize);
      if (aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1) {
        availSize.BSize(wm) = GetAvailableContentBSize(aReflowInput);
      }

      LogicalSize computedSize = aReflowInput.ComputedSize(wm);

      if (reflowNext)
        child->AddStateBits(NS_FRAME_IS_DIRTY);

      LogicalSize kidCBSize(wm, availSize.ISize(wm), computedSize.BSize(wm));
      ReflowInput kidReflowInput(PresContext(), aReflowInput, child,
                                       availSize, &kidCBSize);
      kidReflowInput.mFlags.mIsTopOfPage = true;
      kidReflowInput.mFlags.mTableIsSplittable = false;
      kidReflowInput.mFlags.mIsColumnBalancing = aConfig.mBalanceColCount < INT32_MAX;

      // We need to reflow any float placeholders, even if our column height
      // hasn't changed.
      kidReflowInput.mFlags.mMustReflowPlaceholders = !colBSizeChanged;

#ifdef DEBUG_roc
      printf("*** Reflowing child #%d %p: availHeight=%d\n",
             columnCount, (void*)child,availSize.BSize(wm));
#endif

      // Note if the column's next in flow is not being changed by this incremental reflow.
      // This may allow the current column to avoid trying to pull lines from the next column.
      if (child->GetNextSibling() &&
          !(GetStateBits() & NS_FRAME_IS_DIRTY) &&
        !(child->GetNextSibling()->GetStateBits() & NS_FRAME_IS_DIRTY)) {
        kidReflowInput.mFlags.mNextInFlowUntouched = true;
      }

      ReflowOutput kidDesiredSize(wm, aDesiredSize.mFlags);

      // XXX it would be cool to consult the float manager for the
      // previous block to figure out the region of floats from the
      // previous column that extend into this column, and subtract
      // that region from the new float manager.  So you could stick a
      // really big float in the first column and text in following
      // columns would flow around it.

      // Reflow the frame
      LogicalPoint origin(wm,
                          childOrigin.I(wm) +
                          kidReflowInput.ComputedLogicalMargin().IStart(wm),
                          childOrigin.B(wm) +
                          kidReflowInput.ComputedLogicalMargin().BStart(wm));
      ReflowChild(child, PresContext(), kidDesiredSize, kidReflowInput,
                  wm, origin, containerSize, 0, aStatus);

      reflowNext = (aStatus & NS_FRAME_REFLOW_NEXTINFLOW) != 0;

#ifdef DEBUG_roc
      printf("*** Reflowed child #%d %p: status = %d, desiredSize=%d,%d CarriedOutBEndMargin=%d\n",
             columnCount, (void*)child, aStatus, kidDesiredSize.Width(), kidDesiredSize.Height(),
             kidDesiredSize.mCarriedOutBEndMargin.get());
#endif

      NS_FRAME_TRACE_REFLOW_OUT("Column::Reflow", aStatus);

      *aCarriedOutBEndMargin = kidDesiredSize.mCarriedOutBEndMargin;

      FinishReflowChild(child, PresContext(), kidDesiredSize,
                        &kidReflowInput, wm, childOrigin, containerSize, 0);

      childContentBEnd = nsLayoutUtils::CalculateContentBEnd(wm, child);
      if (childContentBEnd > aConfig.mColMaxBSize) {
        allFit = false;
      }
      if (childContentBEnd > availSize.BSize(wm)) {
        aColData.mMaxOverflowingBSize = std::max(childContentBEnd,
            aColData.mMaxOverflowingBSize);
      }
    }

    contentRect.UnionRect(contentRect, child->GetRect());

    ConsiderChildOverflow(overflowRects, child);
    contentBEnd = std::max(contentBEnd, childContentBEnd);
    aColData.mLastBSize = childContentBEnd;
    aColData.mSumBSize += childContentBEnd;

    // Build a continuation column if necessary
    nsIFrame* kidNextInFlow = child->GetNextInFlow();

    if (NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !NS_FRAME_IS_TRUNCATED(aStatus)) {
      NS_ASSERTION(!kidNextInFlow, "next in flow should have been deleted");
      child = nullptr;
      break;
    } else {
      ++columnCount;
      // Make sure that the column has a next-in-flow. If not, we must
      // create one to hold the overflowing stuff, even if we're just
      // going to put it on our overflow list and let *our*
      // next in flow handle it.
      if (!kidNextInFlow) {
        NS_ASSERTION(aStatus & NS_FRAME_REFLOW_NEXTINFLOW,
                     "We have to create a continuation, but the block doesn't want us to reflow it?");

        // We need to create a continuing column
        kidNextInFlow = CreateNextInFlow(child);
      }

      // Make sure we reflow a next-in-flow when it switches between being
      // normal or overflow container
      if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aStatus)) {
        if (!(kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
          aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
          reflowNext = true;
          kidNextInFlow->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
        }
      }
      else if (kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
        aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
        reflowNext = true;
        kidNextInFlow->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
      }

      if ((contentBEnd > aReflowInput.ComputedMaxBSize() ||
           contentBEnd > aReflowInput.ComputedBSize()) &&
           aConfig.mBalanceColCount < INT32_MAX) {
        // We overflowed vertically, but have not exceeded the number of
        // columns. We're going to go into overflow columns now, so balancing
        // no longer applies.
        aColData.mHasExcessBSize = true;
      }

      if (columnCount >= aConfig.mBalanceColCount) {
        // No more columns allowed here. Stop.
        aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
        kidNextInFlow->AddStateBits(NS_FRAME_IS_DIRTY);
        // Move any of our leftover columns to our overflow list. Our
        // next-in-flow will eventually pick them up.
        const nsFrameList& continuationColumns = mFrames.RemoveFramesAfter(child);
        if (continuationColumns.NotEmpty()) {
          SetOverflowFrames(continuationColumns);
        }
        child = nullptr;
        break;
      }
    }

    if (PresContext()->HasPendingInterrupt()) {
      // Stop the loop now while |child| still points to the frame that bailed
      // out.  We could keep going here and condition a bunch of the code in
      // this loop on whether there's an interrupt, or even just keep going and
      // trying to reflow the blocks (even though we know they'll interrupt
      // right after their first line), but stopping now is conceptually the
      // simplest (and probably fastest) thing.
      break;
    }

    // Advance to the next column
    child = child->GetNextSibling();

    if (child) {
      childOrigin.I(wm) += aConfig.mColISize + aConfig.mColGap;

#ifdef DEBUG_roc
      printf("*** NEXT CHILD ORIGIN.icoord = %d\n", childOrigin.I(wm));
#endif
    }
  }

  if (PresContext()->CheckForInterrupt(this) &&
      (GetStateBits() & NS_FRAME_IS_DIRTY)) {
    // Mark all our kids starting with |child| dirty

    // Note that this is a CheckForInterrupt call, not a HasPendingInterrupt,
    // because we might have interrupted while reflowing |child|, and since
    // we're about to add a dirty bit to |child| we need to make sure that
    // |this| is scheduled to have dirty bits marked on it and its ancestors.
    // Otherwise, when we go to mark dirty bits on |child|'s ancestors we'll
    // bail out immediately, since it'll already have a dirty bit.
    for (; child; child = child->GetNextSibling()) {
      child->AddStateBits(NS_FRAME_IS_DIRTY);
    }
  }

  aColData.mMaxBSize = contentBEnd;
  LogicalSize contentSize = LogicalSize(wm, contentRect.Size());
  contentSize.BSize(wm) = std::max(contentSize.BSize(wm), contentBEnd);
  mLastFrameStatus = aStatus;

  // Apply computed and min/max values
  if (aConfig.mComputedBSize != NS_INTRINSICSIZE) {
    if (aReflowInput.AvailableBSize() != NS_INTRINSICSIZE) {
      contentSize.BSize(wm) = std::min(contentSize.BSize(wm),
                                       aConfig.mComputedBSize);
    } else {
      contentSize.BSize(wm) = aConfig.mComputedBSize;
    }
  } else {
    // We add the "consumed" block-size back in so that we're applying
    // constraints to the correct bSize value, then subtract it again
    // after we've finished with the min/max calculation. This prevents us from
    // having a last continuation that is smaller than the min bSize. but which
    // has prev-in-flows, trigger a larger bSize than actually required.
    contentSize.BSize(wm) =
      aReflowInput.ApplyMinMaxBSize(contentSize.BSize(wm),
                                    aConfig.mConsumedBSize);
  }
  if (aReflowInput.ComputedISize() != NS_INTRINSICSIZE) {
    contentSize.ISize(wm) = aReflowInput.ComputedISize();
  } else {
    contentSize.ISize(wm) =
      aReflowInput.ApplyMinMaxISize(contentSize.ISize(wm));
  }

  contentSize.ISize(wm) += borderPadding.IStartEnd(wm);
  contentSize.BSize(wm) += borderPadding.BStartEnd(wm);
  aDesiredSize.SetSize(wm, contentSize);
  aDesiredSize.mOverflowAreas = overflowRects;
  aDesiredSize.UnionOverflowAreasWithDesiredBounds();

  // In vertical-rl mode, make a second pass if necessary to reposition the
  // columns with the correct container width. (In other writing modes,
  // correct containerSize was not required for column positioning so we don't
  // need this fixup.)
  if (wm.IsVerticalRL() && containerSize.width != contentSize.Width(wm)) {
    const nsSize finalContainerSize = aDesiredSize.PhysicalSize();
    for (nsIFrame* child : mFrames) {
      // Get the logical position as set previously using a provisional or
      // dummy containerSize, and reset with the correct container size.
      child->SetPosition(wm, child->GetLogicalPosition(wm, containerSize),
                         finalContainerSize);
    }
  }

#ifdef DEBUG_roc
  printf("*** DONE PASS feasible=%d\n", allFit && NS_FRAME_IS_FULLY_COMPLETE(aStatus)
         && !NS_FRAME_IS_TRUNCATED(aStatus));
#endif
  return allFit && NS_FRAME_IS_FULLY_COMPLETE(aStatus)
    && !NS_FRAME_IS_TRUNCATED(aStatus);
}
Exemple #9
0
/* virtual */ void
nsRubyFrame::Reflow(nsPresContext* aPresContext,
                    ReflowOutput& aDesiredSize,
                    const ReflowInput& aReflowInput,
                    nsReflowStatus& aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsRubyFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

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

  // Grab overflow frames from prev-in-flow and its own.
  MoveInlineOverflowToChildList(
    aReflowInput.mLineLayout->LineContainerFrame());

  // Clear leadings
  mLeadings.Reset();

  // Since the ruby base container is going to reflow not only the ruby
  // base frames, but also the ruby text frames, and then *afterwards*
  // we're going to reflow the ruby text containers (which do not reflow
  // their children), we need to transfer NS_FRAME_IS_DIRTY status from
  // the ruby text containers to their child ruby texts now, both so
  // that the ruby texts are marked dirty if needed, and so that the
  // ruby text container doesn't mark the ruby text frames dirty *after*
  // they're reflowed and leave dirty bits in a clean tree (suppressing
  // future reflows, due to lack of a queued reflow to clean them).
  for (nsIFrame* child : PrincipalChildList()) {
    if (child->HasAnyStateBits(NS_FRAME_IS_DIRTY) &&
        child->IsRubyTextContainerFrame()) {
      for (nsIFrame* grandchild : child->PrincipalChildList()) {
        grandchild->AddStateBits(NS_FRAME_IS_DIRTY);
      }
      // Replace NS_FRAME_IS_DIRTY with NS_FRAME_HAS_DIRTY_CHILDREN so
      // we still have a dirty marking, but one that we won't transfer
      // to children again.
      child->RemoveStateBits(NS_FRAME_IS_DIRTY);
      child->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
    }
  }

  // Begin the span for the ruby frame
  WritingMode frameWM = aReflowInput.GetWritingMode();
  WritingMode lineWM = aReflowInput.mLineLayout->GetWritingMode();
  LogicalMargin borderPadding = aReflowInput.ComputedLogicalBorderPadding();
  nscoord startEdge = 0;
  const bool boxDecorationBreakClone =
    StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Clone;
  if (boxDecorationBreakClone || !GetPrevContinuation()) {
    startEdge = borderPadding.IStart(frameWM);
  }
  NS_ASSERTION(aReflowInput.AvailableISize() != NS_UNCONSTRAINEDSIZE,
               "should no longer use available widths");
  nscoord availableISize = aReflowInput.AvailableISize();
  availableISize -= startEdge + borderPadding.IEnd(frameWM);
  aReflowInput.mLineLayout->BeginSpan(this, &aReflowInput,
                                      startEdge, availableISize, &mBaseline);

  for (RubySegmentEnumerator e(this); !e.AtEnd(); e.Next()) {
    ReflowSegment(aPresContext, aReflowInput, e.GetBaseContainer(), aStatus);

    if (aStatus.IsInlineBreak()) {
      // A break occurs when reflowing the segment.
      // Don't continue reflowing more segments.
      break;
    }
  }

  ContinuationTraversingState pullState(this);
  while (aStatus.IsEmpty()) {
    nsRubyBaseContainerFrame* baseContainer =
      PullOneSegment(aReflowInput.mLineLayout, pullState);
    if (!baseContainer) {
      // No more continuations after, finish now.
      break;
    }
    ReflowSegment(aPresContext, aReflowInput, baseContainer, aStatus);
  }
  // We never handle overflow in ruby.
  MOZ_ASSERT(!aStatus.IsOverflowIncomplete());

  aDesiredSize.ISize(lineWM) = aReflowInput.mLineLayout->EndSpan(this);
  if (boxDecorationBreakClone || !GetPrevContinuation()) {
    aDesiredSize.ISize(lineWM) += borderPadding.IStart(frameWM);
  }
  if (boxDecorationBreakClone || aStatus.IsComplete()) {
    aDesiredSize.ISize(lineWM) += borderPadding.IEnd(frameWM);
  }

  // Update descendant leadings of ancestor ruby base container.
  if (nsRubyBaseContainerFrame* rbc = FindRubyBaseContainerAncestor(this)) {
    rbc->UpdateDescendantLeadings(mLeadings);
  }

  nsLayoutUtils::SetBSizeFromFontMetrics(this, aDesiredSize,
                                         borderPadding, lineWM, frameWM);
}
/* 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->CalcLineHeight(), -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);
}