C++ nsHTMLReflowMetrics::GetWritingMode方法代码示例

// For token elements, mBoundingMetrics is computed at the ReflowToken
// pass, it is not computed here because our children may be text frames
// that do not implement the GetBoundingMetrics() interface.
/* virtual */ nsresult
nsMathMLTokenFrame::Place(DrawTarget*          aDrawTarget,
                          bool                 aPlaceOrigin,
                          nsHTMLReflowMetrics& aDesiredSize)
{
  mBoundingMetrics = nsBoundingMetrics();
  for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
       childFrame = childFrame->GetNextSibling()) {
    nsHTMLReflowMetrics childSize(aDesiredSize.GetWritingMode());
    GetReflowAndBoundingMetricsFor(childFrame, childSize,
                                   childSize.mBoundingMetrics, nullptr);
    // compute and cache the bounding metrics
    mBoundingMetrics += childSize.mBoundingMetrics;
  }

  RefPtr<nsFontMetrics> fm;
  nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
                                        nsLayoutUtils::
                                        FontSizeInflationFor(this));
  nscoord ascent = fm->MaxAscent();
  nscoord descent = fm->MaxDescent();

  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
  aDesiredSize.Width() = mBoundingMetrics.width;
  aDesiredSize.SetBlockStartAscent(std::max(mBoundingMetrics.ascent, ascent));
  aDesiredSize.Height() = aDesiredSize.BlockStartAscent() +
                        std::max(mBoundingMetrics.descent, descent);

  if (aPlaceOrigin) {
    nscoord dy, dx = 0;
    for (nsIFrame* childFrame = GetFirstPrincipalChild(); childFrame;
         childFrame = childFrame->GetNextSibling()) {
      nsHTMLReflowMetrics childSize(aDesiredSize.GetWritingMode());
      GetReflowAndBoundingMetricsFor(childFrame, childSize,
                                     childSize.mBoundingMetrics);

      // place and size the child; (dx,0) makes the caret happy - bug 188146
      dy = childSize.Height() == 0 ? 0 : aDesiredSize.BlockStartAscent() - childSize.BlockStartAscent();
      FinishReflowChild(childFrame, PresContext(), childSize, nullptr, dx, dy, 0);
      dx += childSize.Width();
    }
  }

  SetReference(nsPoint(0, aDesiredSize.BlockStartAscent()));

  return NS_OK;
}

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

/* virtual */ nsresult
nsMathMLmunderoverFrame::Place(nsRenderingContext& aRenderingContext,
                               bool                 aPlaceOrigin,
                               nsHTMLReflowMetrics& aDesiredSize)
{
  nsIAtom* tag = mContent->Tag();
  if (NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) &&
      StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_INLINE) {
    //place like sub sup or subsup
    if (tag == nsGkAtoms::munderover_) {
      return nsMathMLmmultiscriptsFrame::PlaceMultiScript(PresContext(),
                                                          aRenderingContext,
                                                          aPlaceOrigin,
                                                          aDesiredSize,
                                                          this, 0, 0);
    } else if (tag == nsGkAtoms::munder_) {
      return nsMathMLmmultiscriptsFrame::PlaceMultiScript(PresContext(),
                                                          aRenderingContext,
                                                          aPlaceOrigin,
                                                          aDesiredSize,
                                                          this, 0, 0);
    } else {
      NS_ASSERTION(tag == nsGkAtoms::mover_, "mContent->Tag() not recognized");
      return nsMathMLmmultiscriptsFrame::PlaceMultiScript(PresContext(),
                                                          aRenderingContext,
                                                          aPlaceOrigin,
                                                          aDesiredSize,
                                                          this, 0, 0);
    }
    
  }

  ////////////////////////////////////
  // Get the children's desired sizes

  nsBoundingMetrics bmBase, bmUnder, bmOver;
  nsHTMLReflowMetrics baseSize(aDesiredSize.GetWritingMode());
  nsHTMLReflowMetrics underSize(aDesiredSize.GetWritingMode());
  nsHTMLReflowMetrics overSize(aDesiredSize.GetWritingMode());
  nsIFrame* overFrame = nullptr;
  nsIFrame* underFrame = nullptr;
  nsIFrame* baseFrame = mFrames.FirstChild();
  underSize.SetBlockStartAscent(0);
  overSize.SetBlockStartAscent(0);
  bool haveError = false;
  if (baseFrame) {
    if (tag == nsGkAtoms::munder_ ||
        tag == nsGkAtoms::munderover_) {
      underFrame = baseFrame->GetNextSibling();
    } else if (tag == nsGkAtoms::mover_) {
      overFrame = baseFrame->GetNextSibling();
    }
  }
  if (underFrame && tag == nsGkAtoms::munderover_) {
    overFrame = underFrame->GetNextSibling();
  }
  
  if (tag == nsGkAtoms::munder_) {
    if (!baseFrame || !underFrame || underFrame->GetNextSibling()) {
      // report an error, encourage people to get their markups in order
      haveError = true;
    }
  }
  if (tag == nsGkAtoms::mover_) {
    if (!baseFrame || !overFrame || overFrame->GetNextSibling()) {
      // report an error, encourage people to get their markups in order
      haveError = true;
    }
  }
  if (tag == nsGkAtoms::munderover_) {
    if (!baseFrame || !underFrame || !overFrame || overFrame->GetNextSibling()) {
      // report an error, encourage people to get their markups in order
      haveError = true;
    }
  }
  if (haveError) {
    if (aPlaceOrigin) {
      ReportChildCountError();
    } 
    return ReflowError(aRenderingContext, aDesiredSize);
  }
  GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
  if (underFrame) {
    GetReflowAndBoundingMetricsFor(underFrame, underSize, bmUnder);
  }
  if (overFrame) {
    GetReflowAndBoundingMetricsFor(overFrame, overSize, bmOver);
  }

  nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);

  ////////////////////
  // Place Children

  nsRefPtr<nsFontMetrics> fm;
  nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));

  nscoord xHeight = fm->XHeight();
  nscoord oneDevPixel = fm->AppUnitsPerDevPixel();
  gfxFont* mathFont = fm->GetThebesFontGroup()->GetFirstMathFont();
//.........这里部分代码省略.........

void
nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext,
                                               nsHTMLReflowMetrics& aButtonDesiredSize,
                                               const nsHTMLReflowState& aButtonReflowState,
                                               nsIFrame* aFirstKid)
{
  WritingMode wm = GetWritingMode();
  LogicalSize availSize = aButtonReflowState.ComputedSize(wm);
  availSize.BSize(wm) = NS_INTRINSICSIZE;

  // Buttons have some bonus renderer-determined border/padding,
  // which occupies part of the button's content-box area:
  LogicalMargin focusPadding =
    LogicalMargin(wm, mRenderer.GetAddedButtonBorderAndPadding());

  // See whether out availSize's inline-size is big enough.  If it's
  // smaller than our intrinsic min iSize, that means that the kid
  // wouldn't really fit.  In that case, we overflow into our internal
  // focuspadding (which other browsers don't have) so that there's a
  // little more space for it.
  // Note that GetMinISize includes the focusPadding.
  nscoord IOverflow = GetMinISize(aButtonReflowState.rendContext) -
                      aButtonReflowState.ComputedISize();
  nscoord IFocusPadding = focusPadding.IStartEnd(wm);
  nscoord focusPaddingReduction = std::min(IFocusPadding,
                                           std::max(IOverflow, 0));
  if (focusPaddingReduction > 0) {
    nscoord startReduction = focusPadding.IStart(wm);
    if (focusPaddingReduction != IFocusPadding) {
      startReduction = NSToCoordRound(startReduction *
                                      (float(focusPaddingReduction) /
                                       float(IFocusPadding)));
    }
    focusPadding.IStart(wm) -= startReduction;
    focusPadding.IEnd(wm) -= focusPaddingReduction - startReduction;
  }

  // shorthand for a value we need to use in a bunch of places
  const LogicalMargin& clbp = aButtonReflowState.ComputedLogicalBorderPadding();

  // Indent the child inside us by the focus border. We must do this separate
  // from the regular border.
  availSize.ISize(wm) -= focusPadding.IStartEnd(wm);

  LogicalPoint childPos(wm);
  childPos.I(wm) = focusPadding.IStart(wm) + clbp.IStart(wm);
  availSize.ISize(wm) = std::max(availSize.ISize(wm), 0);

  // Give child a clone of the button's reflow state, with height/width reduced
  // by focusPadding, so that descendants with height:100% don't protrude.
  nsHTMLReflowState adjustedButtonReflowState =
    CloneReflowStateWithReducedContentBox(aButtonReflowState,
                                          focusPadding.GetPhysicalMargin(wm));

  nsHTMLReflowState contentsReflowState(aPresContext,
                                        adjustedButtonReflowState,
                                        aFirstKid, availSize);

  nsReflowStatus contentsReflowStatus;
  nsHTMLReflowMetrics contentsDesiredSize(aButtonReflowState);
  childPos.B(wm) = 0; // This will be set properly later, after reflowing the
                      // child to determine its size.

  // We just pass a dummy containerSize here, as the child will be
  // repositioned later by FinishReflowChild.
  nsSize dummyContainerSize;
  ReflowChild(aFirstKid, aPresContext,
              contentsDesiredSize, contentsReflowState,
              wm, childPos, dummyContainerSize, 0, contentsReflowStatus);
  MOZ_ASSERT(NS_FRAME_IS_COMPLETE(contentsReflowStatus),
             "We gave button-contents frame unconstrained available height, "
             "so it should be complete");

  // Compute the button's content-box size:
  LogicalSize buttonContentBox(wm);
  if (aButtonReflowState.ComputedBSize() != NS_INTRINSICSIZE) {
    // Button has a fixed block-size -- that's its content-box bSize.
    buttonContentBox.BSize(wm) = aButtonReflowState.ComputedBSize();
  } else {
    // Button is intrinsically sized -- it should shrinkwrap the
    // button-contents' bSize, plus any focus-padding space:
    buttonContentBox.BSize(wm) =
      contentsDesiredSize.BSize(wm) + focusPadding.BStartEnd(wm);

    // Make sure we obey min/max-bSize in the case when we're doing intrinsic
    // sizing (we get it for free when we have a non-intrinsic
    // aButtonReflowState.ComputedBSize()).  Note that we do this before
    // adjusting for borderpadding, since mComputedMaxBSize and
    // mComputedMinBSize are content bSizes.
    buttonContentBox.BSize(wm) =
      NS_CSS_MINMAX(buttonContentBox.BSize(wm),
                    aButtonReflowState.ComputedMinBSize(),
                    aButtonReflowState.ComputedMaxBSize());
  }
  if (aButtonReflowState.ComputedISize() != NS_INTRINSICSIZE) {
    buttonContentBox.ISize(wm) = aButtonReflowState.ComputedISize();
  } else {
    buttonContentBox.ISize(wm) =
      contentsDesiredSize.ISize(wm) + focusPadding.IStartEnd(wm);
    buttonContentBox.ISize(wm) =
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    // = sup{1,2,3} in TeX
    // supScriptShift1 = superscriptshift attribute * x-height
    // Note that there are THREE values for supscript shifts depending
    // on the current style
    nscoord supScriptShift1, supScriptShift2, supScriptShift3;
    // Set supScriptShift{1,2,3} default from font
    GetSupScriptShifts (fm, supScriptShift1, supScriptShift2, supScriptShift3);

    // get sup script shift depending on current script level and display style
    // Rule 18c, App. G, TeXbook
    if (font->mScriptLevel == 0 &&
        font->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK &&
        !NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
      // Style D in TeXbook
      supScriptShift = supScriptShift1;
    } else if (NS_MATHML_IS_COMPRESSED(presentationData.flags)) {
      // Style C' in TeXbook = D',T',S',SS'
      supScriptShift = supScriptShift3;
    } else {
      // everything else = T,S,SS
      supScriptShift = supScriptShift2;
    }
  }

  if (0 < aUserSupScriptShift) {
    // the user has set the supscriptshift attribute
    supScriptShift = std::max(supScriptShift, aUserSupScriptShift);
  }

  ////////////////////////////////////
  // Get the children's sizes
  ////////////////////////////////////

  const WritingMode wm(aDesiredSize.GetWritingMode());
  nscoord width = 0, prescriptsWidth = 0, rightBearing = 0;
  nscoord minSubScriptShift = 0, minSupScriptShift = 0;
  nscoord trySubScriptShift = subScriptShift;
  nscoord trySupScriptShift = supScriptShift;
  nscoord maxSubScriptShift = subScriptShift;
  nscoord maxSupScriptShift = supScriptShift;
  nsHTMLReflowMetrics baseSize(wm);
  nsHTMLReflowMetrics subScriptSize(wm);
  nsHTMLReflowMetrics supScriptSize(wm);
  nsHTMLReflowMetrics multiSubSize(wm), multiSupSize(wm);
  baseFrame = nullptr;
  nsIFrame* subScriptFrame = nullptr;
  nsIFrame* supScriptFrame = nullptr;
  nsIFrame* prescriptsFrame = nullptr; // frame of <mprescripts/>, if there.

  bool firstPrescriptsPair = false;
  nsBoundingMetrics bmBase, bmSubScript, bmSupScript, bmMultiSub, bmMultiSup;
  multiSubSize.SetBlockStartAscent(-0x7FFFFFFF);
  multiSupSize.SetBlockStartAscent(-0x7FFFFFFF);
  bmMultiSub.ascent = bmMultiSup.ascent = -0x7FFFFFFF;
  bmMultiSub.descent = bmMultiSup.descent = -0x7FFFFFFF;
  nscoord italicCorrection = 0;

  nsBoundingMetrics boundingMetrics;
  boundingMetrics.width = 0;
  boundingMetrics.ascent = boundingMetrics.descent = -0x7FFFFFFF;
  aDesiredSize.Width() = aDesiredSize.Height() = 0;

  int32_t count = 0;
  bool foundNoneTag = false;

  // Boolean to determine whether the current child is a subscript.

void
nsVideoFrame::Reflow(nsPresContext*           aPresContext,
                     nsHTMLReflowMetrics&     aMetrics,
                     const nsHTMLReflowState& aReflowState,
                     nsReflowStatus&          aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsVideoFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
  NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
                  ("enter nsVideoFrame::Reflow: availSize=%d,%d",
                  aReflowState.AvailableWidth(), aReflowState.AvailableHeight()));

  NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");

  aStatus = NS_FRAME_COMPLETE;

  aMetrics.Width() = aReflowState.ComputedWidth();
  aMetrics.Height() = aReflowState.ComputedHeight();

  // stash this away so we can compute our inner area later
  mBorderPadding   = aReflowState.ComputedPhysicalBorderPadding();

  aMetrics.Width() += mBorderPadding.left + mBorderPadding.right;
  aMetrics.Height() += mBorderPadding.top + mBorderPadding.bottom;

  // Reflow the child frames. We may have up to two, an image frame
  // which is the poster, and a box frame, which is the video controls.
  for (nsIFrame* child : mFrames) {
    if (child->GetContent() == mPosterImage) {
      // Reflow the poster frame.
      nsImageFrame* imageFrame = static_cast<nsImageFrame*>(child);
      nsHTMLReflowMetrics kidDesiredSize(aReflowState);
      WritingMode wm = imageFrame->GetWritingMode();
      LogicalSize availableSize = aReflowState.AvailableSize(wm);
      LogicalSize cbSize = aMetrics.Size(aMetrics.GetWritingMode()).
                             ConvertTo(wm, aMetrics.GetWritingMode());
      nsHTMLReflowState kidReflowState(aPresContext,
                                       aReflowState,
                                       imageFrame,
                                       availableSize,
                                       &cbSize);

      nsRect posterRenderRect;
      if (ShouldDisplayPoster()) {
        posterRenderRect =
          nsRect(nsPoint(mBorderPadding.left, mBorderPadding.top),
                 nsSize(aReflowState.ComputedWidth(),
                        aReflowState.ComputedHeight()));
      }
      kidReflowState.SetComputedWidth(posterRenderRect.width);
      kidReflowState.SetComputedHeight(posterRenderRect.height);
      ReflowChild(imageFrame, aPresContext, kidDesiredSize, kidReflowState,
                  posterRenderRect.x, posterRenderRect.y, 0, aStatus);
      FinishReflowChild(imageFrame, aPresContext,
                        kidDesiredSize, &kidReflowState,
                        posterRenderRect.x, posterRenderRect.y, 0);
    } else if (child->GetContent() == mVideoControls) {
      // Reflow the video controls frame.
      nsBoxLayoutState boxState(PresContext(), aReflowState.rendContext);
      nsSize size = child->GetSize();
      nsBoxFrame::LayoutChildAt(boxState,
                                child,
                                nsRect(mBorderPadding.left,
                                       mBorderPadding.top,
                                       aReflowState.ComputedWidth(),
                                       aReflowState.ComputedHeight()));
      if (child->GetSize() != size) {
        RefPtr<nsRunnable> event = new DispatchResizeToControls(child->GetContent());
        nsContentUtils::AddScriptRunner(event);
      }
    } else if (child->GetContent() == mCaptionDiv) {
      // Reflow to caption div
      nsHTMLReflowMetrics kidDesiredSize(aReflowState);
      WritingMode wm = child->GetWritingMode();
      LogicalSize availableSize = aReflowState.AvailableSize(wm);
      LogicalSize cbSize = aMetrics.Size(aMetrics.GetWritingMode()).
                             ConvertTo(wm, aMetrics.GetWritingMode());
      nsHTMLReflowState kidReflowState(aPresContext,
                                       aReflowState,
                                       child,
                                       availableSize,
                                       &cbSize);
      nsSize size(aReflowState.ComputedWidth(), aReflowState.ComputedHeight());
      size.width -= kidReflowState.ComputedPhysicalBorderPadding().LeftRight();
      size.height -= kidReflowState.ComputedPhysicalBorderPadding().TopBottom();

      kidReflowState.SetComputedWidth(std::max(size.width, 0));
      kidReflowState.SetComputedHeight(std::max(size.height, 0));

      ReflowChild(child, aPresContext, kidDesiredSize, kidReflowState,
                  mBorderPadding.left, mBorderPadding.top, 0, aStatus);
      FinishReflowChild(child, aPresContext,
                        kidDesiredSize, &kidReflowState,
                        mBorderPadding.left, mBorderPadding.top, 0);
    }
  }
  aMetrics.SetOverflowAreasToDesiredBounds();

  FinishAndStoreOverflow(&aMetrics);
//.........这里部分代码省略.........

void
nsHTMLButtonControlFrame::ReflowButtonContents(nsPresContext* aPresContext,
        nsHTMLReflowMetrics& aButtonDesiredSize,
        const nsHTMLReflowState& aButtonReflowState,
        nsIFrame* aFirstKid)
{
    WritingMode wm = GetWritingMode();
    bool isVertical = wm.IsVertical();
    LogicalSize availSize = aButtonReflowState.ComputedSize(wm);
    availSize.BSize(wm) = NS_INTRINSICSIZE;

    // Buttons have some bonus renderer-determined border/padding,
    // which occupies part of the button's content-box area:
    const LogicalMargin focusPadding =
        LogicalMargin(wm, mRenderer.GetAddedButtonBorderAndPadding());

    // shorthand for a value we need to use in a bunch of places
    const LogicalMargin& clbp = aButtonReflowState.ComputedLogicalBorderPadding();

    // Indent the child inside us by the focus border. We must do this separate
    // from the regular border.
    availSize.ISize(wm) -= focusPadding.IStartEnd(wm);

    // See whether out availSize's inline-size is big enough.  If it's smaller than
    // our intrinsic min iSize, that means that the kid wouldn't really fit; for a
    // better look in such cases we adjust the available iSize and our inline-start
    // offset to allow the kid to spill start-wards into our padding.
    nscoord ioffset = focusPadding.IStart(wm) + clbp.IStart(wm);
    nscoord extraISize = GetMinISize(aButtonReflowState.rendContext) -
                         aButtonReflowState.ComputedISize();
    if (extraISize > 0) {
        nscoord extraIStart = extraISize / 2;
        nscoord extraIEnd = extraISize - extraIStart;
        NS_ASSERTION(extraIEnd >=0, "How'd that happen?");

        // Do not allow the extras to be bigger than the relevant padding
        const LogicalMargin& padding = aButtonReflowState.ComputedLogicalPadding();
        extraIStart = std::min(extraIStart, padding.IStart(wm));
        extraIEnd = std::min(extraIEnd, padding.IEnd(wm));
        ioffset -= extraIStart;
        availSize.ISize(wm) = availSize.ISize(wm) + extraIStart + extraIEnd;
    }
    availSize.ISize(wm) = std::max(availSize.ISize(wm), 0);

    // Give child a clone of the button's reflow state, with height/width reduced
    // by focusPadding, so that descendants with height:100% don't protrude.
    nsHTMLReflowState adjustedButtonReflowState =
        CloneReflowStateWithReducedContentBox(aButtonReflowState,
                focusPadding.GetPhysicalMargin(wm));

    nsHTMLReflowState contentsReflowState(aPresContext,
                                          adjustedButtonReflowState,
                                          aFirstKid, availSize);

    nsReflowStatus contentsReflowStatus;
    nsHTMLReflowMetrics contentsDesiredSize(aButtonReflowState);
    nscoord boffset = focusPadding.BStart(wm) + clbp.BStart(wm);
    ReflowChild(aFirstKid, aPresContext,
                contentsDesiredSize, contentsReflowState,
                isVertical ? boffset : ioffset,
                isVertical ? ioffset : boffset,
                0, contentsReflowStatus);
    MOZ_ASSERT(NS_FRAME_IS_COMPLETE(contentsReflowStatus),
               "We gave button-contents frame unconstrained available height, "
               "so it should be complete");

    // Compute the button's content-box height:
    nscoord buttonContentBoxBSize = 0;
    if (aButtonReflowState.ComputedBSize() != NS_INTRINSICSIZE) {
        // Button has a fixed block-size -- that's its content-box bSize.
        buttonContentBoxBSize = aButtonReflowState.ComputedBSize();
    } else {
        // Button is intrinsically sized -- it should shrinkwrap the
        // button-contents' bSize, plus any focus-padding space:
        buttonContentBoxBSize =
            contentsDesiredSize.BSize(wm) + focusPadding.BStartEnd(wm);

        // Make sure we obey min/max-bSize in the case when we're doing intrinsic
        // sizing (we get it for free when we have a non-intrinsic
        // aButtonReflowState.ComputedBSize()).  Note that we do this before
        // adjusting for borderpadding, since mComputedMaxBSize and
        // mComputedMinBSize are content bSizes.
        buttonContentBoxBSize =
            NS_CSS_MINMAX(buttonContentBoxBSize,
                          aButtonReflowState.ComputedMinBSize(),
                          aButtonReflowState.ComputedMaxBSize());
    }

    // Center child in the block-direction in the button
    // (technically, inside of the button's focus-padding area)
    nscoord extraSpace =
        buttonContentBoxBSize - focusPadding.BStartEnd(wm) -
        contentsDesiredSize.BSize(wm);

    boffset = std::max(0, extraSpace / 2);

    // Adjust boffset to be in terms of the button's frame-rect, instead of
    // its focus-padding rect:
    boffset += focusPadding.BStart(wm) + clbp.BStart(wm);

//.........这里部分代码省略.........

nsresult
nsMathMLmfracFrame::PlaceInternal(nsRenderingContext& aRenderingContext,
                                  bool                 aPlaceOrigin,
                                  nsHTMLReflowMetrics& aDesiredSize,
                                  bool                 aWidthOnly)
{
    ////////////////////////////////////
    // Get the children's desired sizes
    nsBoundingMetrics bmNum, bmDen;
    nsHTMLReflowMetrics sizeNum(aDesiredSize.GetWritingMode());
    nsHTMLReflowMetrics sizeDen(aDesiredSize.GetWritingMode());
    nsIFrame* frameDen = nullptr;
    nsIFrame* frameNum = mFrames.FirstChild();
    if (frameNum)
        frameDen = frameNum->GetNextSibling();
    if (!frameNum || !frameDen || frameDen->GetNextSibling()) {
        // report an error, encourage people to get their markups in order
        if (aPlaceOrigin) {
            ReportChildCountError();
        }
        return ReflowError(aRenderingContext, aDesiredSize);
    }
    GetReflowAndBoundingMetricsFor(frameNum, sizeNum, bmNum);
    GetReflowAndBoundingMetricsFor(frameDen, sizeDen, bmDen);

    nsPresContext* presContext = PresContext();
    nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);

    float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
    nsRefPtr<nsFontMetrics> fm;
    nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
                                          fontSizeInflation);

    nscoord defaultRuleThickness, axisHeight;
    nscoord oneDevPixel = fm->AppUnitsPerDevPixel();
    gfxFont* mathFont = fm->GetThebesFontGroup()->GetFirstMathFont();
    if (mathFont) {
        defaultRuleThickness =
            mathFont->GetMathConstant(gfxFontEntry::FractionRuleThickness,
                                      oneDevPixel);
    } else {
        GetRuleThickness(aRenderingContext, fm, defaultRuleThickness);
    }
    GetAxisHeight(aRenderingContext, fm, axisHeight);

    bool outermostEmbellished = false;
    if (mEmbellishData.coreFrame) {
        nsEmbellishData parentData;
        GetEmbellishDataFrom(GetParent(), parentData);
        outermostEmbellished = parentData.coreFrame != mEmbellishData.coreFrame;
    }

    // see if the linethickness attribute is there
    nsAutoString value;
    mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::linethickness_, value);
    mLineThickness = CalcLineThickness(presContext, mStyleContext, value,
                                       onePixel, defaultRuleThickness,
                                       fontSizeInflation);

    // bevelled attribute
    mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::bevelled_, value);
    mIsBevelled = value.EqualsLiteral("true");

    bool displayStyle = StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK;

    if (!mIsBevelled) {
        mLineRect.height = mLineThickness;

        // by default, leave at least one-pixel padding at either end, and add
        // lspace & rspace that may come from <mo> if we are an outermost
        // embellished container (we fetch values from the core since they may use
        // units that depend on style data, and style changes could have occurred
        // in the core since our last visit there)
        nscoord leftSpace = onePixel;
        nscoord rightSpace = onePixel;
        if (outermostEmbellished) {
            nsEmbellishData coreData;
            GetEmbellishDataFrom(mEmbellishData.coreFrame, coreData);
            leftSpace += StyleVisibility()->mDirection ?
                         coreData.trailingSpace : coreData.leadingSpace;
            rightSpace += StyleVisibility()->mDirection ?
                          coreData.leadingSpace : coreData.trailingSpace;
        }

        nscoord actualRuleThickness =  mLineThickness;

        //////////////////
        // Get shifts
        nscoord numShift = 0;
        nscoord denShift = 0;

        // Rule 15b, App. G, TeXbook
        nscoord numShift1, numShift2, numShift3;
        nscoord denShift1, denShift2;

        GetNumeratorShifts(fm, numShift1, numShift2, numShift3);
        GetDenominatorShifts(fm, denShift1, denShift2);

        if (0 == actualRuleThickness) {
            numShift = displayStyle ? numShift1 : numShift3;
//.........这里部分代码省略.........

void
nsFirstLetterFrame::Reflow(nsPresContext*          aPresContext,
                           nsHTMLReflowMetrics&     aMetrics,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aReflowStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aReflowStatus);

  // Grab overflow list
  DrainOverflowFrames(aPresContext);

  nsIFrame* kid = mFrames.FirstChild();

  // Setup reflow state for our child
  WritingMode wm = aReflowState.GetWritingMode();
  LogicalSize availSize = aReflowState.AvailableSize();
  const LogicalMargin& bp = aReflowState.ComputedLogicalBorderPadding();
  NS_ASSERTION(availSize.ISize(wm) != NS_UNCONSTRAINEDSIZE,
               "should no longer use unconstrained inline size");
  availSize.ISize(wm) -= bp.IStartEnd(wm);
  if (NS_UNCONSTRAINEDSIZE != availSize.BSize(wm)) {
    availSize.BSize(wm) -= bp.BStartEnd(wm);
  }

  WritingMode lineWM = aMetrics.GetWritingMode();
  nsHTMLReflowMetrics kidMetrics(lineWM);

  // Reflow the child
  if (!aReflowState.mLineLayout) {
    // When there is no lineLayout provided, we provide our own. The
    // only time that the first-letter-frame is not reflowing in a
    // line context is when its floating.
    WritingMode kidWritingMode = GetWritingMode(kid);
    LogicalSize kidAvailSize = availSize.ConvertTo(kidWritingMode, wm);
    nsHTMLReflowState rs(aPresContext, aReflowState, kid, kidAvailSize);
    nsLineLayout ll(aPresContext, nullptr, &aReflowState, nullptr, nullptr);

    ll.BeginLineReflow(bp.IStart(wm), bp.BStart(wm),
                       availSize.ISize(wm), NS_UNCONSTRAINEDSIZE,
                       false, true, kidWritingMode,
                       nsSize(aReflowState.AvailableWidth(),
                              aReflowState.AvailableHeight()));
    rs.mLineLayout = ≪
    ll.SetInFirstLetter(true);
    ll.SetFirstLetterStyleOK(true);

    kid->Reflow(aPresContext, kidMetrics, rs, aReflowStatus);

    ll.EndLineReflow();
    ll.SetInFirstLetter(false);

    // In the floating first-letter case, we need to set this ourselves;
    // nsLineLayout::BeginSpan will set it in the other case
    mBaseline = kidMetrics.BlockStartAscent();

    // Place and size the child and update the output metrics
    LogicalSize convertedSize = kidMetrics.Size(lineWM).ConvertTo(wm, lineWM);
    kid->SetRect(nsRect(bp.IStart(wm), bp.BStart(wm),
                        convertedSize.ISize(wm), convertedSize.BSize(wm)));
    kid->FinishAndStoreOverflow(&kidMetrics);
    kid->DidReflow(aPresContext, nullptr, nsDidReflowStatus::FINISHED);

    convertedSize.ISize(wm) += bp.IStartEnd(wm);
    convertedSize.BSize(wm) += bp.BStartEnd(wm);
    aMetrics.SetSize(wm, convertedSize);
    aMetrics.SetBlockStartAscent(kidMetrics.BlockStartAscent() +
                                 bp.BStart(wm));

    // Ensure that the overflow rect contains the child textframe's
    // overflow rect.
    // Note that if this is floating, the overline/underline drawable
    // area is in the overflow rect of the child textframe.
    aMetrics.UnionOverflowAreasWithDesiredBounds();
    ConsiderChildOverflow(aMetrics.mOverflowAreas, kid);

    FinishAndStoreOverflow(&aMetrics);
  }
  else {
    // Pretend we are a span and reflow the child frame
    nsLineLayout* ll = aReflowState.mLineLayout;
    bool          pushedFrame;

    ll->SetInFirstLetter(
      mStyleContext->GetPseudo() == nsCSSPseudoElements::firstLetter);
    ll->BeginSpan(this, &aReflowState, bp.IStart(wm),
                  availSize.ISize(wm), &mBaseline);
    ll->ReflowFrame(kid, aReflowStatus, &kidMetrics, pushedFrame);
    NS_ASSERTION(lineWM.IsVertical() == wm.IsVertical(),
                 "we're assuming we can mix sizes between lineWM and wm "
                 "since we shouldn't have orthogonal writing modes within "
                 "a line.");
    aMetrics.ISize(lineWM) = ll->EndSpan(this) + bp.IStartEnd(wm);
    ll->SetInFirstLetter(false);

    nsLayoutUtils::SetBSizeFromFontMetrics(this, aMetrics, bp, lineWM, wm);
  }

  if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
//.........这里部分代码省略.........

/* virtual */ nsresult
nsMathMLmencloseFrame::PlaceInternal(nsRenderingContext& aRenderingContext,
                                     bool                 aPlaceOrigin,
                                     nsHTMLReflowMetrics& aDesiredSize,
                                     bool                 aWidthOnly)
{
  ///////////////
  // Measure the size of our content using the base class to format like an
  // inferred mrow.
  nsHTMLReflowMetrics baseSize(aDesiredSize.GetWritingMode());
  nsresult rv =
    nsMathMLContainerFrame::Place(aRenderingContext, false, baseSize);

  if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
      DidReflowChildren(GetFirstPrincipalChild());
      return rv;
    }

  nsBoundingMetrics bmBase = baseSize.mBoundingMetrics;
  nscoord dx_left = 0, dx_right = 0;
  nsBoundingMetrics bmLongdivChar, bmRadicalChar;
  nscoord radicalAscent = 0, radicalDescent = 0;
  nscoord longdivAscent = 0, longdivDescent = 0;
  nscoord psi = 0;

  ///////////////
  // Thickness of bars and font metrics
  nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);

  nscoord mEmHeight;
  nsRefPtr<nsFontMetrics> fm;
  nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
  aRenderingContext.SetFont(fm);
  GetRuleThickness(aRenderingContext, fm, mRuleThickness);
  GetEmHeight(fm, mEmHeight);

  char16_t one = '1';
  nsBoundingMetrics bmOne = aRenderingContext.GetBoundingMetrics(&one, 1);

  ///////////////
  // General rules: the menclose element takes the size of the enclosed content.
  // We add a padding when needed.

  // determine padding & psi
  nscoord padding = 3 * mRuleThickness;
  nscoord delta = padding % onePixel;
  if (delta)
    padding += onePixel - delta; // round up

  if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
      nscoord phi;
      // Rule 11, App. G, TeXbook
      // psi = clearance between rule and content
      if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
        phi = fm->XHeight();
      else
        phi = mRuleThickness;
      psi = mRuleThickness + phi / 4;

      delta = psi % onePixel;
      if (delta)
        psi += onePixel - delta; // round up
    }

  if (mRuleThickness < onePixel)
    mRuleThickness = onePixel;
 
  // Set horizontal parameters
  if (IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_TOP) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_BOTTOM) ||
      IsToDraw(NOTATION_CIRCLE))
    dx_left = padding;

  if (IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_TOP) ||
      IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_BOTTOM) ||
      IsToDraw(NOTATION_CIRCLE))
    dx_right = padding;

  // Set vertical parameters
  if (IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_UPDIAGONALARROW) ||
      IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_VERTICALSTRIKE) ||
      IsToDraw(NOTATION_CIRCLE) ||
      IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_RADICAL) ||
      IsToDraw(NOTATION_LONGDIV)) {
      // set a minimal value for the base height
      bmBase.ascent = std::max(bmOne.ascent, bmBase.ascent);
      bmBase.descent = std::max(0, bmBase.descent);
  }

  mBoundingMetrics.ascent = bmBase.ascent;
  mBoundingMetrics.descent = bmBase.descent;
//.........这里部分代码省略.........

void
nsMathMLmtableOuterFrame::Reflow(nsPresContext*          aPresContext,
                                 nsHTMLReflowMetrics&     aDesiredSize,
                                 const nsHTMLReflowState& aReflowState,
                                 nsReflowStatus&          aStatus)
{
  nsAutoString value;
  // we want to return a table that is anchored according to the align attribute

  nsTableOuterFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
  NS_ASSERTION(aDesiredSize.Height() >= 0, "illegal height for mtable");
  NS_ASSERTION(aDesiredSize.Width() >= 0, "illegal width for mtable");

  // see if the user has set the align attribute on the <mtable>
  int32_t rowIndex = 0;
  eAlign tableAlign = eAlign_axis;
  mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::align, value);
  if (!value.IsEmpty()) {
    ParseAlignAttribute(value, tableAlign, rowIndex);
  }

  // adjustments if there is a specified row from where to anchor the table
  // (conceptually: when there is no row of reference, picture the table as if
  // it is wrapped in a single big fictional row at dy = 0, this way of
  // doing so allows us to have a single code path for all cases).
  nscoord dy = 0;
  WritingMode wm = aDesiredSize.GetWritingMode();
  nscoord blockSize = aDesiredSize.BSize(wm);
  nsIFrame* rowFrame = nullptr;
  if (rowIndex) {
    rowFrame = GetRowFrameAt(rowIndex);
    if (rowFrame) {
      // translate the coordinates to be relative to us and in our writing mode
      nsIFrame* frame = rowFrame;
      LogicalRect rect(wm, frame->GetRect(),
                       aReflowState.ComputedSizeAsContainerIfConstrained());
      blockSize = rect.BSize(wm);
      do {
        dy += rect.BStart(wm);
        frame = frame->GetParent();
      } while (frame != this);
    }
  }
  switch (tableAlign) {
    case eAlign_top:
      aDesiredSize.SetBlockStartAscent(dy);
      break;
    case eAlign_bottom:
      aDesiredSize.SetBlockStartAscent(dy + blockSize);
      break;
    case eAlign_center:
      aDesiredSize.SetBlockStartAscent(dy + blockSize / 2);
      break;
    case eAlign_baseline:
      if (rowFrame) {
        // anchor the table on the baseline of the row of reference
        nscoord rowAscent = ((nsTableRowFrame*)rowFrame)->GetMaxCellAscent();
        if (rowAscent) { // the row has at least one cell with 'vertical-align: baseline'
          aDesiredSize.SetBlockStartAscent(dy + rowAscent);
          break;
        }
      }
      // in other situations, fallback to center
      aDesiredSize.SetBlockStartAscent(dy + blockSize / 2);
      break;
    case eAlign_axis:
    default: {
      // XXX should instead use style data from the row of reference here ?
      RefPtr<nsFontMetrics> fm;
      nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
                                            nsLayoutUtils::
                                            FontSizeInflationFor(this));
      nscoord axisHeight;
      GetAxisHeight(aReflowState.rendContext->GetDrawTarget(), fm, axisHeight);
      if (rowFrame) {
        // anchor the table on the axis of the row of reference
        // XXX fallback to baseline because it is a hard problem
        // XXX need to fetch the axis of the row; would need rowalign=axis to work better
        nscoord rowAscent = ((nsTableRowFrame*)rowFrame)->GetMaxCellAscent();
        if (rowAscent) { // the row has at least one cell with 'vertical-align: baseline'
          aDesiredSize.SetBlockStartAscent(dy + rowAscent);
          break;
        }
      }
      // in other situations, fallback to using half of the height
      aDesiredSize.SetBlockStartAscent(dy + blockSize / 2 + axisHeight);
    }
  }

  mReference.x = 0;
  mReference.y = aDesiredSize.BlockStartAscent();

  // just make-up a bounding metrics
  mBoundingMetrics = nsBoundingMetrics();
  mBoundingMetrics.ascent = aDesiredSize.BlockStartAscent();
  mBoundingMetrics.descent = aDesiredSize.Height() -
                             aDesiredSize.BlockStartAscent();
  mBoundingMetrics.width = aDesiredSize.Width();
  mBoundingMetrics.leftBearing = 0;
  mBoundingMetrics.rightBearing = aDesiredSize.Width();
//.........这里部分代码省略.........