Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 827 insertions, 0 deletions

diff --git a/layout/mathml/nsMathMLmencloseFrame.cpp b/layout/mathml/nsMathMLmencloseFrame.cpp
new file mode 100644
index 0000000000..1b8a03991b
--- /dev/null
+++ b/layout/mathml/nsMathMLmencloseFrame.cpp
@@ -0,0 +1,827 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsMathMLmencloseFrame.h"
+
+#include "gfx2DGlue.h"
+#include "gfxUtils.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/StaticPrefs_mathml.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/PathHelpers.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsWhitespaceTokenizer.h"
+
+#include "nsDisplayList.h"
+#include "gfxContext.h"
+#include "nsMathMLChar.h"
+#include <algorithm>
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+//
+// <menclose> -- enclose content with a stretching symbol such
+// as a long division sign. - implementation
+
+// longdiv:
+// Unicode 5.1 assigns U+27CC to LONG DIVISION, but a right parenthesis
+// renders better with current font support.
+static const char16_t kLongDivChar = ')';
+
+// radical: 'SQUARE ROOT'
+static const char16_t kRadicalChar = 0x221A;
+
+// updiagonalstrike
+static const uint8_t kArrowHeadSize = 10;
+
+// phasorangle
+static const uint8_t kPhasorangleWidth = 8;
+
+nsIFrame* NS_NewMathMLmencloseFrame(PresShell* aPresShell,
+                                    ComputedStyle* aStyle) {
+  return new (aPresShell)
+      nsMathMLmencloseFrame(aStyle, aPresShell->GetPresContext());
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmencloseFrame)
+
+nsMathMLmencloseFrame::nsMathMLmencloseFrame(ComputedStyle* aStyle,
+                                             nsPresContext* aPresContext,
+                                             ClassID aID)
+    : nsMathMLContainerFrame(aStyle, aPresContext, aID),
+      mRuleThickness(0),
+      mRadicalRuleThickness(0),
+      mLongDivCharIndex(-1),
+      mRadicalCharIndex(-1),
+      mContentWidth(0) {}
+
+nsMathMLmencloseFrame::~nsMathMLmencloseFrame() = default;
+
+nsresult nsMathMLmencloseFrame::AllocateMathMLChar(nsMencloseNotation mask) {
+  // Is the char already allocated?
+  if ((mask == NOTATION_LONGDIV && mLongDivCharIndex >= 0) ||
+      (mask == NOTATION_RADICAL && mRadicalCharIndex >= 0))
+    return NS_OK;
+
+  // No need to track the ComputedStyle given to our MathML chars.
+  // The Style System will use Get/SetAdditionalComputedStyle() to keep it
+  // up-to-date if dynamic changes arise.
+  uint32_t i = mMathMLChar.Length();
+  nsAutoString Char;
+
+  // XXX(Bug 1631371) Check if this should use a fallible operation as it
+  // pretended earlier, or change the return type to void.
+  mMathMLChar.AppendElement();
+
+  if (mask == NOTATION_LONGDIV) {
+    Char.Assign(kLongDivChar);
+    mLongDivCharIndex = i;
+  } else if (mask == NOTATION_RADICAL) {
+    Char.Assign(kRadicalChar);
+    mRadicalCharIndex = i;
+  }
+
+  mMathMLChar[i].SetData(Char);
+  mMathMLChar[i].SetComputedStyle(Style());
+
+  return NS_OK;
+}
+
+/*
+ * Add a notation to draw, if the argument is the name of a known notation.
+ * @param aNotation string name of a notation
+ */
+nsresult nsMathMLmencloseFrame::AddNotation(const nsAString& aNotation) {
+  nsresult rv;
+
+  if (aNotation.EqualsLiteral("longdiv")) {
+    rv = AllocateMathMLChar(NOTATION_LONGDIV);
+    NS_ENSURE_SUCCESS(rv, rv);
+    mNotationsToDraw += NOTATION_LONGDIV;
+  } else if (aNotation.EqualsLiteral("actuarial")) {
+    mNotationsToDraw += NOTATION_RIGHT;
+    mNotationsToDraw += NOTATION_TOP;
+  } else if (aNotation.EqualsLiteral("box")) {
+    mNotationsToDraw += NOTATION_LEFT;
+    mNotationsToDraw += NOTATION_RIGHT;
+    mNotationsToDraw += NOTATION_TOP;
+    mNotationsToDraw += NOTATION_BOTTOM;
+  } else if (aNotation.EqualsLiteral("roundedbox")) {
+    mNotationsToDraw += NOTATION_ROUNDEDBOX;
+  } else if (aNotation.EqualsLiteral("circle")) {
+    mNotationsToDraw += NOTATION_CIRCLE;
+  } else if (aNotation.EqualsLiteral("left")) {
+    mNotationsToDraw += NOTATION_LEFT;
+  } else if (aNotation.EqualsLiteral("right")) {
+    mNotationsToDraw += NOTATION_RIGHT;
+  } else if (aNotation.EqualsLiteral("top")) {
+    mNotationsToDraw += NOTATION_TOP;
+  } else if (aNotation.EqualsLiteral("bottom")) {
+    mNotationsToDraw += NOTATION_BOTTOM;
+  } else if (aNotation.EqualsLiteral("updiagonalstrike")) {
+    mNotationsToDraw += NOTATION_UPDIAGONALSTRIKE;
+  } else if (aNotation.EqualsLiteral("updiagonalarrow")) {
+    mNotationsToDraw += NOTATION_UPDIAGONALARROW;
+  } else if (aNotation.EqualsLiteral("downdiagonalstrike")) {
+    mNotationsToDraw += NOTATION_DOWNDIAGONALSTRIKE;
+  } else if (aNotation.EqualsLiteral("verticalstrike")) {
+    mNotationsToDraw += NOTATION_VERTICALSTRIKE;
+  } else if (aNotation.EqualsLiteral("horizontalstrike")) {
+    mNotationsToDraw += NOTATION_HORIZONTALSTRIKE;
+  } else if (aNotation.EqualsLiteral("madruwb")) {
+    mNotationsToDraw += NOTATION_RIGHT;
+    mNotationsToDraw += NOTATION_BOTTOM;
+  } else if (aNotation.EqualsLiteral("phasorangle")) {
+    mNotationsToDraw += NOTATION_BOTTOM;
+    mNotationsToDraw += NOTATION_PHASORANGLE;
+  }
+
+  return NS_OK;
+}
+
+/*
+ * Initialize the list of notations to draw
+ */
+void nsMathMLmencloseFrame::InitNotations() {
+  MarkNeedsDisplayItemRebuild();
+  mNotationsToDraw.clear();
+  mLongDivCharIndex = mRadicalCharIndex = -1;
+  mMathMLChar.Clear();
+
+  nsAutoString value;
+
+  if (mContent->AsElement()->GetAttr(nsGkAtoms::notation_, value)) {
+    // parse the notation attribute
+    nsWhitespaceTokenizer tokenizer(value);
+
+    while (tokenizer.hasMoreTokens()) AddNotation(tokenizer.nextToken());
+
+    if (IsToDraw(NOTATION_UPDIAGONALARROW)) {
+      // For <menclose notation="updiagonalstrike updiagonalarrow">, if
+      // the two notations are drawn then the strike line may cause the point of
+      // the arrow to be too wide. Hence we will only draw the updiagonalarrow
+      // and the arrow shaft may be thought to be the updiagonalstrike.
+      mNotationsToDraw -= NOTATION_UPDIAGONALSTRIKE;
+    }
+  } else {
+    // default: longdiv
+    if (NS_FAILED(AllocateMathMLChar(NOTATION_LONGDIV))) return;
+    mNotationsToDraw += NOTATION_LONGDIV;
+  }
+}
+
+NS_IMETHODIMP
+nsMathMLmencloseFrame::InheritAutomaticData(nsIFrame* aParent) {
+  // let the base class get the default from our parent
+  nsMathMLContainerFrame::InheritAutomaticData(aParent);
+
+  mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
+
+  InitNotations();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMathMLmencloseFrame::TransmitAutomaticData() {
+  if (IsToDraw(NOTATION_RADICAL)) {
+    // The TeXBook (Ch 17. p.141) says that \sqrt is cramped
+    UpdatePresentationDataFromChildAt(0, -1, NS_MATHML_COMPRESSED,
+                                      NS_MATHML_COMPRESSED);
+  }
+
+  return NS_OK;
+}
+
+void nsMathMLmencloseFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                             const nsDisplayListSet& aLists) {
+  /////////////
+  // paint the menclosed content
+  nsMathMLContainerFrame::BuildDisplayList(aBuilder, aLists);
+
+  if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) return;
+
+  nsRect mencloseRect = nsIFrame::GetRect();
+  mencloseRect.x = mencloseRect.y = 0;
+
+  if (IsToDraw(NOTATION_RADICAL)) {
+    mMathMLChar[mRadicalCharIndex].Display(aBuilder, this, aLists, 0);
+
+    nsRect rect;
+    mMathMLChar[mRadicalCharIndex].GetRect(rect);
+    rect.MoveBy(StyleVisibility()->mDirection == StyleDirection::Rtl
+                    ? -mContentWidth
+                    : rect.width,
+                0);
+    rect.SizeTo(mContentWidth, mRadicalRuleThickness);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_RADICAL);
+  }
+
+  if (IsToDraw(NOTATION_PHASORANGLE)) {
+    DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness,
+                    NOTATION_PHASORANGLE);
+  }
+
+  if (IsToDraw(NOTATION_LONGDIV)) {
+    mMathMLChar[mLongDivCharIndex].Display(aBuilder, this, aLists, 1);
+
+    nsRect rect;
+    mMathMLChar[mLongDivCharIndex].GetRect(rect);
+    rect.SizeTo(rect.width + mContentWidth, mRuleThickness);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_LONGDIV);
+  }
+
+  if (IsToDraw(NOTATION_TOP)) {
+    nsRect rect(0, 0, mencloseRect.width, mRuleThickness);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_TOP);
+  }
+
+  if (IsToDraw(NOTATION_BOTTOM)) {
+    nsRect rect(0, mencloseRect.height - mRuleThickness, mencloseRect.width,
+                mRuleThickness);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_BOTTOM);
+  }
+
+  if (IsToDraw(NOTATION_LEFT)) {
+    nsRect rect(0, 0, mRuleThickness, mencloseRect.height);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_LEFT);
+  }
+
+  if (IsToDraw(NOTATION_RIGHT)) {
+    nsRect rect(mencloseRect.width - mRuleThickness, 0, mRuleThickness,
+                mencloseRect.height);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_RIGHT);
+  }
+
+  if (IsToDraw(NOTATION_ROUNDEDBOX)) {
+    DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness,
+                    NOTATION_ROUNDEDBOX);
+  }
+
+  if (IsToDraw(NOTATION_CIRCLE)) {
+    DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness,
+                    NOTATION_CIRCLE);
+  }
+
+  if (IsToDraw(NOTATION_UPDIAGONALSTRIKE)) {
+    DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness,
+                    NOTATION_UPDIAGONALSTRIKE);
+  }
+
+  if (IsToDraw(NOTATION_UPDIAGONALARROW)) {
+    DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness,
+                    NOTATION_UPDIAGONALARROW);
+  }
+
+  if (IsToDraw(NOTATION_DOWNDIAGONALSTRIKE)) {
+    DisplayNotation(aBuilder, this, mencloseRect, aLists, mRuleThickness,
+                    NOTATION_DOWNDIAGONALSTRIKE);
+  }
+
+  if (IsToDraw(NOTATION_HORIZONTALSTRIKE)) {
+    nsRect rect(0, mencloseRect.height / 2 - mRuleThickness / 2,
+                mencloseRect.width, mRuleThickness);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_HORIZONTALSTRIKE);
+  }
+
+  if (IsToDraw(NOTATION_VERTICALSTRIKE)) {
+    nsRect rect(mencloseRect.width / 2 - mRuleThickness / 2, 0, mRuleThickness,
+                mencloseRect.height);
+    DisplayBar(aBuilder, this, rect, aLists, NOTATION_VERTICALSTRIKE);
+  }
+}
+
+/* virtual */
+nsresult nsMathMLmencloseFrame::MeasureForWidth(DrawTarget* aDrawTarget,
+                                                ReflowOutput& aDesiredSize) {
+  return PlaceInternal(aDrawTarget, false, aDesiredSize, true);
+}
+
+/* virtual */
+nsresult nsMathMLmencloseFrame::Place(DrawTarget* aDrawTarget,
+                                      bool aPlaceOrigin,
+                                      ReflowOutput& aDesiredSize) {
+  return PlaceInternal(aDrawTarget, aPlaceOrigin, aDesiredSize, false);
+}
+
+/* virtual */
+nsresult nsMathMLmencloseFrame::PlaceInternal(DrawTarget* aDrawTarget,
+                                              bool aPlaceOrigin,
+                                              ReflowOutput& aDesiredSize,
+                                              bool aWidthOnly) {
+  ///////////////
+  // Measure the size of our content using the base class to format like an
+  // inferred mrow.
+  ReflowOutput baseSize(aDesiredSize.GetWritingMode());
+  nsresult rv = nsMathMLContainerFrame::Place(aDrawTarget, false, baseSize);
+
+  if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
+    DidReflowChildren(PrincipalChildList().FirstChild());
+    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;
+  nscoord leading = 0;
+
+  ///////////////
+  // Thickness of bars and font metrics
+  nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
+
+  float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
+  RefPtr<nsFontMetrics> fm =
+      nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);
+  GetRuleThickness(aDrawTarget, fm, mRuleThickness);
+  if (mRuleThickness < onePixel) {
+    mRuleThickness = onePixel;
+  }
+
+  char16_t one = '1';
+  nsBoundingMetrics bmOne =
+      nsLayoutUtils::AppUnitBoundsOfString(&one, 1, *fm, aDrawTarget);
+
+  ///////////////
+  // 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)) {
+    GetRadicalParameters(fm, StyleFont()->mMathStyle == StyleMathStyle::Normal,
+                         mRadicalRuleThickness, leading, psi);
+
+    // make sure that the rule appears on on screen
+    if (mRadicalRuleThickness < onePixel) {
+      mRadicalRuleThickness = onePixel;
+    }
+
+    // adjust clearance psi to get an exact number of pixels -- this
+    // gives a nicer & uniform look on stacked radicals (bug 130282)
+    delta = psi % onePixel;
+    if (delta) {
+      psi += onePixel - delta;  // round up
+    }
+  }
+
+  // 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) || IsToDraw(NOTATION_PHASORANGLE)) {
+    // 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;
+
+  if (IsToDraw(NOTATION_ROUNDEDBOX) || IsToDraw(NOTATION_TOP) ||
+      IsToDraw(NOTATION_LEFT) || IsToDraw(NOTATION_RIGHT) ||
+      IsToDraw(NOTATION_CIRCLE))
+    mBoundingMetrics.ascent += padding;
+
+  if (IsToDraw(NOTATION_ROUNDEDBOX) || IsToDraw(NOTATION_LEFT) ||
+      IsToDraw(NOTATION_RIGHT) || IsToDraw(NOTATION_BOTTOM) ||
+      IsToDraw(NOTATION_CIRCLE))
+    mBoundingMetrics.descent += padding;
+
+  ///////////////
+  // phasorangle notation
+  if (IsToDraw(NOTATION_PHASORANGLE)) {
+    nscoord phasorangleWidth = kPhasorangleWidth * mRuleThickness;
+    // Update horizontal parameters
+    dx_left = std::max(dx_left, phasorangleWidth);
+  }
+
+  ///////////////
+  // updiagonal arrow notation. We need enough space at the top right corner to
+  // draw the arrow head.
+  if (IsToDraw(NOTATION_UPDIAGONALARROW)) {
+    // This is an estimate, see nsDisplayNotation::Paint for the exact head size
+    nscoord arrowHeadSize = kArrowHeadSize * mRuleThickness;
+
+    // We want that the arrow shaft strikes the menclose content and that the
+    // arrow head does not overlap with that content. Hence we add some space
+    // on the right. We don't add space on the top but only ensure that the
+    // ascent is large enough.
+    dx_right = std::max(dx_right, arrowHeadSize);
+    mBoundingMetrics.ascent = std::max(mBoundingMetrics.ascent, arrowHeadSize);
+  }
+
+  ///////////////
+  // circle notation: we don't want the ellipse to overlap the enclosed
+  // content. Hence, we need to increase the size of the bounding box by a
+  // factor of at least sqrt(2).
+  if (IsToDraw(NOTATION_CIRCLE)) {
+    double ratio = (sqrt(2.0) - 1.0) / 2.0;
+    nscoord padding2;
+
+    // Update horizontal parameters
+    padding2 = ratio * bmBase.width;
+
+    dx_left = std::max(dx_left, padding2);
+    dx_right = std::max(dx_right, padding2);
+
+    // Update vertical parameters
+    padding2 = ratio * (bmBase.ascent + bmBase.descent);
+
+    mBoundingMetrics.ascent =
+        std::max(mBoundingMetrics.ascent, bmBase.ascent + padding2);
+    mBoundingMetrics.descent =
+        std::max(mBoundingMetrics.descent, bmBase.descent + padding2);
+  }
+
+  ///////////////
+  // longdiv notation:
+  if (IsToDraw(NOTATION_LONGDIV)) {
+    if (aWidthOnly) {
+      nscoord longdiv_width = mMathMLChar[mLongDivCharIndex].GetMaxWidth(
+          this, aDrawTarget, fontSizeInflation);
+
+      // Update horizontal parameters
+      dx_left = std::max(dx_left, longdiv_width);
+    } else {
+      // Stretch the parenthesis to the appropriate height if it is not
+      // big enough.
+      nsBoundingMetrics contSize = bmBase;
+      contSize.ascent = mRuleThickness;
+      contSize.descent = bmBase.ascent + bmBase.descent + psi;
+
+      // height(longdiv) should be >= height(base) + psi + mRuleThickness
+      mMathMLChar[mLongDivCharIndex].Stretch(
+          this, aDrawTarget, fontSizeInflation, NS_STRETCH_DIRECTION_VERTICAL,
+          contSize, bmLongdivChar, NS_STRETCH_LARGER, false);
+      mMathMLChar[mLongDivCharIndex].GetBoundingMetrics(bmLongdivChar);
+
+      // Update horizontal parameters
+      dx_left = std::max(dx_left, bmLongdivChar.width);
+
+      // Update vertical parameters
+      longdivAscent = bmBase.ascent + psi + mRuleThickness;
+      longdivDescent = std::max(
+          bmBase.descent,
+          (bmLongdivChar.ascent + bmLongdivChar.descent - longdivAscent));
+
+      mBoundingMetrics.ascent =
+          std::max(mBoundingMetrics.ascent, longdivAscent);
+      mBoundingMetrics.descent =
+          std::max(mBoundingMetrics.descent, longdivDescent);
+    }
+  }
+
+  ///////////////
+  // radical notation:
+  if (IsToDraw(NOTATION_RADICAL)) {
+    nscoord* dx_leading = StyleVisibility()->mDirection == StyleDirection::Rtl
+                              ? &dx_right
+                              : &dx_left;
+
+    if (aWidthOnly) {
+      nscoord radical_width = mMathMLChar[mRadicalCharIndex].GetMaxWidth(
+          this, aDrawTarget, fontSizeInflation);
+
+      // Update horizontal parameters
+      *dx_leading = std::max(*dx_leading, radical_width);
+    } else {
+      // Stretch the radical symbol to the appropriate height if it is not
+      // big enough.
+      nsBoundingMetrics contSize = bmBase;
+      contSize.ascent = mRadicalRuleThickness;
+      contSize.descent = bmBase.ascent + bmBase.descent + psi;
+
+      // height(radical) should be >= height(base) + psi + mRadicalRuleThickness
+      mMathMLChar[mRadicalCharIndex].Stretch(
+          this, aDrawTarget, fontSizeInflation, NS_STRETCH_DIRECTION_VERTICAL,
+          contSize, bmRadicalChar, NS_STRETCH_LARGER,
+          StyleVisibility()->mDirection == StyleDirection::Rtl);
+      mMathMLChar[mRadicalCharIndex].GetBoundingMetrics(bmRadicalChar);
+
+      // Update horizontal parameters
+      *dx_leading = std::max(*dx_leading, bmRadicalChar.width);
+
+      // Update vertical parameters
+      radicalAscent = bmBase.ascent + psi + mRadicalRuleThickness;
+      radicalDescent = std::max(
+          bmBase.descent,
+          (bmRadicalChar.ascent + bmRadicalChar.descent - radicalAscent));
+
+      mBoundingMetrics.ascent =
+          std::max(mBoundingMetrics.ascent, radicalAscent);
+      mBoundingMetrics.descent =
+          std::max(mBoundingMetrics.descent, radicalDescent);
+    }
+  }
+
+  ///////////////
+  //
+  if (IsToDraw(NOTATION_CIRCLE) || IsToDraw(NOTATION_ROUNDEDBOX) ||
+      (IsToDraw(NOTATION_LEFT) && IsToDraw(NOTATION_RIGHT))) {
+    // center the menclose around the content (horizontally)
+    dx_left = dx_right = std::max(dx_left, dx_right);
+  }
+
+  ///////////////
+  // The maximum size is now computed: set the remaining parameters
+  mBoundingMetrics.width = dx_left + bmBase.width + dx_right;
+
+  mBoundingMetrics.leftBearing = std::min(0, dx_left + bmBase.leftBearing);
+  mBoundingMetrics.rightBearing =
+      std::max(mBoundingMetrics.width, dx_left + bmBase.rightBearing);
+
+  aDesiredSize.Width() = mBoundingMetrics.width;
+
+  aDesiredSize.SetBlockStartAscent(
+      std::max(mBoundingMetrics.ascent, baseSize.BlockStartAscent()));
+  aDesiredSize.Height() =
+      aDesiredSize.BlockStartAscent() +
+      std::max(mBoundingMetrics.descent,
+               baseSize.Height() - baseSize.BlockStartAscent());
+
+  if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
+    nscoord desiredSizeAscent = aDesiredSize.BlockStartAscent();
+    nscoord desiredSizeDescent =
+        aDesiredSize.Height() - aDesiredSize.BlockStartAscent();
+
+    if (IsToDraw(NOTATION_LONGDIV)) {
+      desiredSizeAscent = std::max(desiredSizeAscent, longdivAscent + leading);
+      desiredSizeDescent =
+          std::max(desiredSizeDescent, longdivDescent + mRuleThickness);
+    }
+
+    if (IsToDraw(NOTATION_RADICAL)) {
+      desiredSizeAscent = std::max(desiredSizeAscent, radicalAscent + leading);
+      desiredSizeDescent =
+          std::max(desiredSizeDescent, radicalDescent + mRadicalRuleThickness);
+    }
+
+    aDesiredSize.SetBlockStartAscent(desiredSizeAscent);
+    aDesiredSize.Height() = desiredSizeAscent + desiredSizeDescent;
+  }
+
+  if (IsToDraw(NOTATION_CIRCLE) || IsToDraw(NOTATION_ROUNDEDBOX) ||
+      (IsToDraw(NOTATION_TOP) && IsToDraw(NOTATION_BOTTOM))) {
+    // center the menclose around the content (vertically)
+    nscoord dy = std::max(aDesiredSize.BlockStartAscent() - bmBase.ascent,
+                          aDesiredSize.Height() -
+                              aDesiredSize.BlockStartAscent() - bmBase.descent);
+
+    aDesiredSize.SetBlockStartAscent(bmBase.ascent + dy);
+    aDesiredSize.Height() =
+        aDesiredSize.BlockStartAscent() + bmBase.descent + dy;
+  }
+
+  // Update mBoundingMetrics ascent/descent
+  if (IsToDraw(NOTATION_TOP) || IsToDraw(NOTATION_RIGHT) ||
+      IsToDraw(NOTATION_LEFT) || IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
+      IsToDraw(NOTATION_UPDIAGONALARROW) ||
+      IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
+      IsToDraw(NOTATION_VERTICALSTRIKE) || IsToDraw(NOTATION_CIRCLE) ||
+      IsToDraw(NOTATION_ROUNDEDBOX))
+    mBoundingMetrics.ascent = aDesiredSize.BlockStartAscent();
+
+  if (IsToDraw(NOTATION_BOTTOM) || IsToDraw(NOTATION_RIGHT) ||
+      IsToDraw(NOTATION_LEFT) || IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
+      IsToDraw(NOTATION_UPDIAGONALARROW) ||
+      IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
+      IsToDraw(NOTATION_VERTICALSTRIKE) || IsToDraw(NOTATION_CIRCLE) ||
+      IsToDraw(NOTATION_ROUNDEDBOX))
+    mBoundingMetrics.descent =
+        aDesiredSize.Height() - aDesiredSize.BlockStartAscent();
+
+  // phasorangle notation:
+  // move up from the bottom by the angled line height
+  if (IsToDraw(NOTATION_PHASORANGLE))
+    mBoundingMetrics.ascent = std::max(
+        mBoundingMetrics.ascent,
+        2 * kPhasorangleWidth * mRuleThickness - mBoundingMetrics.descent);
+
+  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
+
+  mReference.x = 0;
+  mReference.y = aDesiredSize.BlockStartAscent();
+
+  if (aPlaceOrigin) {
+    //////////////////
+    // Set position and size of MathMLChars
+    if (IsToDraw(NOTATION_LONGDIV))
+      mMathMLChar[mLongDivCharIndex].SetRect(nsRect(
+          dx_left - bmLongdivChar.width,
+          aDesiredSize.BlockStartAscent() - longdivAscent, bmLongdivChar.width,
+          bmLongdivChar.ascent + bmLongdivChar.descent));
+
+    if (IsToDraw(NOTATION_RADICAL)) {
+      nscoord dx = (StyleVisibility()->mDirection == StyleDirection::Rtl
+                        ? dx_left + bmBase.width
+                        : dx_left - bmRadicalChar.width);
+
+      mMathMLChar[mRadicalCharIndex].SetRect(nsRect(
+          dx, aDesiredSize.BlockStartAscent() - radicalAscent,
+          bmRadicalChar.width, bmRadicalChar.ascent + bmRadicalChar.descent));
+    }
+
+    mContentWidth = bmBase.width;
+
+    //////////////////
+    // Finish reflowing child frames
+    PositionRowChildFrames(dx_left, aDesiredSize.BlockStartAscent());
+  }
+
+  return NS_OK;
+}
+
+nscoord nsMathMLmencloseFrame::FixInterFrameSpacing(
+    ReflowOutput& aDesiredSize) {
+  nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
+  if (!gap) return 0;
+
+  // Move the MathML characters
+  nsRect rect;
+  for (uint32_t i = 0; i < mMathMLChar.Length(); i++) {
+    mMathMLChar[i].GetRect(rect);
+    rect.MoveBy(gap, 0);
+    mMathMLChar[i].SetRect(rect);
+  }
+
+  return gap;
+}
+
+nsresult nsMathMLmencloseFrame::AttributeChanged(int32_t aNameSpaceID,
+                                                 nsAtom* aAttribute,
+                                                 int32_t aModType) {
+  if (aAttribute == nsGkAtoms::notation_) {
+    InitNotations();
+  }
+
+  return nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
+                                                  aModType);
+}
+
+void nsMathMLmencloseFrame::DidSetComputedStyle(ComputedStyle* aOldStyle) {
+  nsMathMLContainerFrame::DidSetComputedStyle(aOldStyle);
+  for (auto& ch : mMathMLChar) {
+    ch.SetComputedStyle(Style());
+  }
+}
+
+//////////////////
+
+namespace mozilla {
+
+class nsDisplayNotation final : public nsPaintedDisplayItem {
+ public:
+  nsDisplayNotation(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
+                    const nsRect& aRect, nscoord aThickness,
+                    nsMencloseNotation aType)
+      : nsPaintedDisplayItem(aBuilder, aFrame),
+        mRect(aRect),
+        mThickness(aThickness),
+        mType(aType) {
+    MOZ_COUNT_CTOR(nsDisplayNotation);
+  }
+  MOZ_COUNTED_DTOR_OVERRIDE(nsDisplayNotation)
+
+  virtual void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
+  NS_DISPLAY_DECL_NAME("MathMLMencloseNotation", TYPE_MATHML_MENCLOSE_NOTATION)
+
+ private:
+  nsRect mRect;
+  nscoord mThickness;
+  nsMencloseNotation mType;
+};
+
+void nsDisplayNotation::Paint(nsDisplayListBuilder* aBuilder,
+                              gfxContext* aCtx) {
+  DrawTarget& aDrawTarget = *aCtx->GetDrawTarget();
+  nsPresContext* presContext = mFrame->PresContext();
+
+  Float strokeWidth = presContext->AppUnitsToGfxUnits(mThickness);
+
+  Rect rect = NSRectToRect(mRect + ToReferenceFrame(),
+                           presContext->AppUnitsPerDevPixel());
+  rect.Deflate(strokeWidth / 2.f);
+
+  ColorPattern color(ToDeviceColor(
+      mFrame->GetVisitedDependentColor(&nsStyleText::mWebkitTextFillColor)));
+
+  StrokeOptions strokeOptions(strokeWidth);
+
+  switch (mType) {
+    case NOTATION_CIRCLE: {
+      RefPtr<Path> ellipse =
+          MakePathForEllipse(aDrawTarget, rect.Center(), rect.Size());
+      aDrawTarget.Stroke(ellipse, color, strokeOptions);
+      return;
+    }
+    case NOTATION_ROUNDEDBOX: {
+      Float radius = 3 * strokeWidth;
+      RectCornerRadii radii(radius, radius);
+      RefPtr<Path> roundedRect =
+          MakePathForRoundedRect(aDrawTarget, rect, radii, true);
+      aDrawTarget.Stroke(roundedRect, color, strokeOptions);
+      return;
+    }
+    case NOTATION_UPDIAGONALSTRIKE: {
+      aDrawTarget.StrokeLine(rect.BottomLeft(), rect.TopRight(), color,
+                             strokeOptions);
+      return;
+    }
+    case NOTATION_DOWNDIAGONALSTRIKE: {
+      aDrawTarget.StrokeLine(rect.TopLeft(), rect.BottomRight(), color,
+                             strokeOptions);
+      return;
+    }
+    case NOTATION_UPDIAGONALARROW: {
+      // Compute some parameters to draw the updiagonalarrow. The values below
+      // are taken from MathJax's HTML-CSS output.
+      Float W = rect.Width();
+      gfxFloat H = rect.Height();
+      Float l = sqrt(W * W + H * H);
+      Float f = Float(kArrowHeadSize) * strokeWidth / l;
+      Float w = W * f;
+      gfxFloat h = H * f;
+
+      // Draw the arrow shaft
+      aDrawTarget.StrokeLine(rect.BottomLeft(),
+                             rect.TopRight() + Point(-.7 * w, .7 * h), color,
+                             strokeOptions);
+
+      // Draw the arrow head
+      RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
+      builder->MoveTo(rect.TopRight());
+      builder->LineTo(
+          rect.TopRight() +
+          Point(-w - .4 * h, std::max(-strokeWidth / 2.0, h - .4 * w)));
+      builder->LineTo(rect.TopRight() + Point(-.7 * w, .7 * h));
+      builder->LineTo(
+          rect.TopRight() +
+          Point(std::min(strokeWidth / 2.0, -w + .4 * h), h + .4 * w));
+      builder->Close();
+      RefPtr<Path> path = builder->Finish();
+      aDrawTarget.Fill(path, color);
+      return;
+    }
+    case NOTATION_PHASORANGLE: {
+      // Compute some parameters to draw the angled line,
+      // that uses a slope of 2 (angle = tan^-1(2)).
+      // H = w * tan(angle) = w * 2
+      Float w = Float(kPhasorangleWidth) * strokeWidth;
+      Float H = 2 * w;
+
+      // Draw the angled line
+      aDrawTarget.StrokeLine(rect.BottomLeft(),
+                             rect.BottomLeft() + Point(w, -H), color,
+                             strokeOptions);
+      return;
+    }
+    default:
+      MOZ_ASSERT_UNREACHABLE(
+          "This notation can not be drawn using "
+          "nsDisplayNotation");
+  }
+}
+
+}  // namespace mozilla
+
+void nsMathMLmencloseFrame::DisplayNotation(nsDisplayListBuilder* aBuilder,
+                                            nsIFrame* aFrame,
+                                            const nsRect& aRect,
+                                            const nsDisplayListSet& aLists,
+                                            nscoord aThickness,
+                                            nsMencloseNotation aType) {
+  if (!aFrame->StyleVisibility()->IsVisible() || aRect.IsEmpty() ||
+      aThickness <= 0)
+    return;
+
+  const uint16_t index = aType;
+  aLists.Content()->AppendNewToTopWithIndex<nsDisplayNotation>(
+      aBuilder, aFrame, index, aRect, aThickness, aType);
+}