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Mypal/layout/mathml/nsMathMLmfracFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsMathMLmfracFrame.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsDisplayList.h"
#include "gfxContext.h"
#include "nsMathMLElement.h"
#include <algorithm>
#include "gfxMathTable.h"
using namespace mozilla;
using namespace mozilla::gfx;
//
// <mfrac> -- form a fraction from two subexpressions - implementation
//
// various fraction line thicknesses (multiplicative values of the default rule thickness)
#define THIN_FRACTION_LINE 0.5f
#define THIN_FRACTION_LINE_MINIMUM_PIXELS 1 // minimum of 1 pixel
#define THICK_FRACTION_LINE 2.0f
#define THICK_FRACTION_LINE_MINIMUM_PIXELS 2 // minimum of 2 pixels
nsIFrame*
NS_NewMathMLmfracFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmfracFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmfracFrame)
nsMathMLmfracFrame::~nsMathMLmfracFrame()
{
}
eMathMLFrameType
nsMathMLmfracFrame::GetMathMLFrameType()
{
// frac is "inner" in TeXBook, Appendix G, rule 15e. See also page 170.
return eMathMLFrameType_Inner;
}
uint8_t
nsMathMLmfracFrame::ScriptIncrement(nsIFrame* aFrame)
{
if (!StyleFont()->mMathDisplay &&
aFrame && (mFrames.FirstChild() == aFrame ||
mFrames.LastChild() == aFrame)) {
return 1;
}
return 0;
}
NS_IMETHODIMP
nsMathMLmfracFrame::TransmitAutomaticData()
{
// The TeXbook (Ch 17. p.141) says the numerator inherits the compression
// while the denominator is compressed
UpdatePresentationDataFromChildAt(1, 1,
NS_MATHML_COMPRESSED,
NS_MATHML_COMPRESSED);
// If displaystyle is false, then scriptlevel is incremented, so notify the
// children of this.
if (!StyleFont()->mMathDisplay) {
PropagateFrameFlagFor(mFrames.FirstChild(),
NS_FRAME_MATHML_SCRIPT_DESCENDANT);
PropagateFrameFlagFor(mFrames.LastChild(),
NS_FRAME_MATHML_SCRIPT_DESCENDANT);
}
// if our numerator is an embellished operator, let its state bubble to us
GetEmbellishDataFrom(mFrames.FirstChild(), mEmbellishData);
if (NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags)) {
// even when embellished, we need to record that <mfrac> won't fire
// Stretch() on its embellished child
mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED;
}
return NS_OK;
}
nscoord
nsMathMLmfracFrame::CalcLineThickness(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsString& aThicknessAttribute,
nscoord onePixel,
nscoord aDefaultRuleThickness,
float aFontSizeInflation)
{
nscoord defaultThickness = aDefaultRuleThickness;
nscoord lineThickness = aDefaultRuleThickness;
nscoord minimumThickness = onePixel;
// linethickness
//
// "Specifies the thickness of the horizontal 'fraction bar', or 'rule'. The
// default value is 'medium', 'thin' is thinner, but visible, 'thick' is
// thicker; the exact thickness of these is left up to the rendering agent."
//
// values: length | "thin" | "medium" | "thick"
// default: medium
//
if (!aThicknessAttribute.IsEmpty()) {
if (aThicknessAttribute.EqualsLiteral("thin")) {
lineThickness = NSToCoordFloor(defaultThickness * THIN_FRACTION_LINE);
minimumThickness = onePixel * THIN_FRACTION_LINE_MINIMUM_PIXELS;
// should visually decrease by at least one pixel, if default is not a pixel
if (defaultThickness > onePixel && lineThickness > defaultThickness - onePixel)
lineThickness = defaultThickness - onePixel;
}
else if (aThicknessAttribute.EqualsLiteral("medium")) {
// medium is default
}
else if (aThicknessAttribute.EqualsLiteral("thick")) {
lineThickness = NSToCoordCeil(defaultThickness * THICK_FRACTION_LINE);
minimumThickness = onePixel * THICK_FRACTION_LINE_MINIMUM_PIXELS;
// should visually increase by at least one pixel
if (lineThickness < defaultThickness + onePixel)
lineThickness = defaultThickness + onePixel;
}
else {
// length value
lineThickness = defaultThickness;
ParseNumericValue(aThicknessAttribute, &lineThickness,
nsMathMLElement::PARSE_ALLOW_UNITLESS,
aPresContext, aStyleContext, aFontSizeInflation);
}
}
// use minimum if the lineThickness is a non-zero value less than minimun
if (lineThickness && lineThickness < minimumThickness)
lineThickness = minimumThickness;
return lineThickness;
}
void
nsMathMLmfracFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists)
{
/////////////
// paint the numerator and denominator
nsMathMLContainerFrame::BuildDisplayList(aBuilder, aLists);
/////////////
// paint the fraction line
if (mIsBevelled) {
DisplaySlash(aBuilder, this, mLineRect, mLineThickness, aLists);
} else {
DisplayBar(aBuilder, this, mLineRect, aLists);
}
}
nsresult
nsMathMLmfracFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (nsGkAtoms::linethickness_ == aAttribute) {
InvalidateFrame();
}
return
nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
aModType);
}
/* virtual */ nsresult
nsMathMLmfracFrame::MeasureForWidth(DrawTarget* aDrawTarget,
ReflowOutput& aDesiredSize)
{
return PlaceInternal(aDrawTarget, false, aDesiredSize, true);
}
nscoord
nsMathMLmfracFrame::FixInterFrameSpacing(ReflowOutput& aDesiredSize)
{
nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
if (!gap) return 0;
mLineRect.MoveBy(gap, 0);
return gap;
}
/* virtual */ nsresult
nsMathMLmfracFrame::Place(DrawTarget* aDrawTarget,
bool aPlaceOrigin,
ReflowOutput& aDesiredSize)
{
return PlaceInternal(aDrawTarget, aPlaceOrigin, aDesiredSize, false);
}
nsresult
nsMathMLmfracFrame::PlaceInternal(DrawTarget* aDrawTarget,
bool aPlaceOrigin,
ReflowOutput& aDesiredSize,
bool aWidthOnly)
{
////////////////////////////////////
// Get the children's desired sizes
nsBoundingMetrics bmNum, bmDen;
ReflowOutput sizeNum(aDesiredSize.GetWritingMode());
ReflowOutput 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(aDrawTarget, aDesiredSize);
}
GetReflowAndBoundingMetricsFor(frameNum, sizeNum, bmNum);
GetReflowAndBoundingMetricsFor(frameDen, sizeDen, bmDen);
nsPresContext* presContext = PresContext();
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation);
nscoord defaultRuleThickness, axisHeight;
nscoord oneDevPixel = fm->AppUnitsPerDevPixel();
gfxFont* mathFont = fm->GetThebesFontGroup()->GetFirstMathFont();
if (mathFont) {
defaultRuleThickness = mathFont->MathTable()->
Constant(gfxMathTable::FractionRuleThickness, oneDevPixel);
} else {
GetRuleThickness(aDrawTarget, fm, defaultRuleThickness);
}
GetAxisHeight(aDrawTarget, 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;
denShift = displayStyle ? denShift1 : denShift2;
if (mathFont) {
numShift = mathFont->
MathTable()->Constant(displayStyle ?
gfxMathTable::StackTopDisplayStyleShiftUp :
gfxMathTable::StackTopShiftUp,
oneDevPixel);
denShift = mathFont->
MathTable()->Constant(displayStyle ?
gfxMathTable::StackBottomDisplayStyleShiftDown :
gfxMathTable::StackBottomShiftDown,
oneDevPixel);
}
} else {
numShift = displayStyle ? numShift1 : numShift2;
denShift = displayStyle ? denShift1 : denShift2;
if (mathFont) {
numShift = mathFont->MathTable()->
Constant(displayStyle ?
gfxMathTable::FractionNumeratorDisplayStyleShiftUp :
gfxMathTable::FractionNumeratorShiftUp,
oneDevPixel);
denShift = mathFont->MathTable()->
Constant(displayStyle ?
gfxMathTable::FractionDenominatorDisplayStyleShiftDown :
gfxMathTable::FractionDenominatorShiftDown,
oneDevPixel);
}
}
if (0 == actualRuleThickness) {
// Rule 15c, App. G, TeXbook
// min clearance between numerator and denominator
nscoord minClearance = displayStyle ?
7 * defaultRuleThickness : 3 * defaultRuleThickness;
if (mathFont) {
minClearance = mathFont->MathTable()->
Constant(displayStyle ?
gfxMathTable::StackDisplayStyleGapMin :
gfxMathTable::StackGapMin,
oneDevPixel);
}
// Factor in axis height
// http://www.mathml-association.org/MathMLinHTML5/S3.html#SS3.SSS2
numShift += axisHeight;
denShift += axisHeight;
nscoord actualClearance =
(numShift - bmNum.descent) - (bmDen.ascent - denShift);
// actualClearance should be >= minClearance
if (actualClearance < minClearance) {
nscoord halfGap = (minClearance - actualClearance)/2;
numShift += halfGap;
denShift += halfGap;
}
}
else {
// Rule 15d, App. G, TeXbook
// min clearance between numerator or denominator and middle of bar
// TeX has a different interpretation of the thickness.
// Try $a \above10pt b$ to see. Here is what TeX does:
// minClearance = displayStyle ?
// 3 * actualRuleThickness : actualRuleThickness;
// we slightly depart from TeX here. We use the defaultRuleThickness instead
// of the value coming from the linethickness attribute, i.e., we recover what
// TeX does if the user hasn't set linethickness. But when the linethickness
// is set, we avoid the wide gap problem.
nscoord minClearanceNum = displayStyle ?
3 * defaultRuleThickness : defaultRuleThickness + onePixel;
nscoord minClearanceDen = minClearanceNum;
if (mathFont) {
minClearanceNum = mathFont->
MathTable()->Constant(displayStyle ?
gfxMathTable::FractionNumDisplayStyleGapMin :
gfxMathTable::FractionNumeratorGapMin,
oneDevPixel);
minClearanceDen = mathFont->
MathTable()->Constant(displayStyle ?
gfxMathTable::FractionDenomDisplayStyleGapMin :
gfxMathTable::FractionDenominatorGapMin,
oneDevPixel);
}
// adjust numShift to maintain minClearanceNum if needed
nscoord actualClearanceNum =
(numShift - bmNum.descent) - (axisHeight + actualRuleThickness/2);
if (actualClearanceNum < minClearanceNum) {
numShift += (minClearanceNum - actualClearanceNum);
}
// adjust denShift to maintain minClearanceDen if needed
nscoord actualClearanceDen =
(axisHeight - actualRuleThickness/2) - (bmDen.ascent - denShift);
if (actualClearanceDen < minClearanceDen) {
denShift += (minClearanceDen - actualClearanceDen);
}
}
//////////////////
// Place Children
// XXX Need revisiting the width. TeX uses the exact width
// e.g. in $$\huge\frac{\displaystyle\int}{i}$$
nscoord width = std::max(bmNum.width, bmDen.width);
nscoord dxNum = leftSpace + (width - sizeNum.Width())/2;
nscoord dxDen = leftSpace + (width - sizeDen.Width())/2;
width += leftSpace + rightSpace;
// see if the numalign attribute is there
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::numalign_, value);
if (value.EqualsLiteral("left"))
dxNum = leftSpace;
else if (value.EqualsLiteral("right"))
dxNum = width - rightSpace - sizeNum.Width();
// see if the denomalign attribute is there
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::denomalign_, value);
if (value.EqualsLiteral("left"))
dxDen = leftSpace;
else if (value.EqualsLiteral("right"))
dxDen = width - rightSpace - sizeDen.Width();
mBoundingMetrics.rightBearing =
std::max(dxNum + bmNum.rightBearing, dxDen + bmDen.rightBearing);
if (mBoundingMetrics.rightBearing < width - rightSpace)
mBoundingMetrics.rightBearing = width - rightSpace;
mBoundingMetrics.leftBearing =
std::min(dxNum + bmNum.leftBearing, dxDen + bmDen.leftBearing);
if (mBoundingMetrics.leftBearing > leftSpace)
mBoundingMetrics.leftBearing = leftSpace;
mBoundingMetrics.ascent = bmNum.ascent + numShift;
mBoundingMetrics.descent = bmDen.descent + denShift;
mBoundingMetrics.width = width;
aDesiredSize.SetBlockStartAscent(sizeNum.BlockStartAscent() + numShift);
aDesiredSize.Height() = aDesiredSize.BlockStartAscent() +
sizeDen.Height() - sizeDen.BlockStartAscent() + denShift;
aDesiredSize.Width() = mBoundingMetrics.width;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.BlockStartAscent();
if (aPlaceOrigin) {
nscoord dy;
// place numerator
dy = 0;
FinishReflowChild(frameNum, presContext, sizeNum, nullptr, dxNum, dy, 0);
// place denominator
dy = aDesiredSize.Height() - sizeDen.Height();
FinishReflowChild(frameDen, presContext, sizeDen, nullptr, dxDen, dy, 0);
// place the fraction bar - dy is top of bar
dy = aDesiredSize.BlockStartAscent() - (axisHeight + actualRuleThickness/2);
mLineRect.SetRect(leftSpace, dy, width - (leftSpace + rightSpace),
actualRuleThickness);
}
} else {
nscoord numShift = 0.0;
nscoord denShift = 0.0;
nscoord padding = 3 * defaultRuleThickness;
nscoord slashRatio = 3;
// Define the constant used in the expression of the maximum width
nscoord em = fm->EmHeight();
nscoord slashMaxWidthConstant = 2 * em;
// For large line thicknesses the minimum slash height is limited to the
// largest expected height of a fraction
nscoord slashMinHeight = slashRatio *
std::min(2 * mLineThickness, slashMaxWidthConstant);
nscoord leadingSpace = padding;
nscoord trailingSpace = padding;
if (outermostEmbellished) {
nsEmbellishData coreData;
GetEmbellishDataFrom(mEmbellishData.coreFrame, coreData);
leadingSpace += coreData.leadingSpace;
trailingSpace += coreData.trailingSpace;
}
nscoord delta;
// ___________
// | | /
// {|-NUMERATOR-| /
// {|___________| S
// { L
// numShift{ A
// ------------------------------------------------------- baseline
// S _____________ } denShift
// H | |}
// / |-DENOMINATOR-|}
// / |_____________|
//
// first, ensure that the top of the numerator is at least as high as the
// top of the denominator (and the reverse for the bottoms)
delta = std::max(bmDen.ascent - bmNum.ascent,
bmNum.descent - bmDen.descent) / 2;
if (delta > 0) {
numShift += delta;
denShift += delta;
}
if (StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_BLOCK) {
delta = std::min(bmDen.ascent + bmDen.descent,
bmNum.ascent + bmNum.descent) / 2;
numShift += delta;
denShift += delta;
} else {
nscoord xHeight = fm->XHeight();
numShift += xHeight / 2;
denShift += xHeight / 4;
}
// Set the ascent/descent of our BoundingMetrics.
mBoundingMetrics.ascent = bmNum.ascent + numShift;
mBoundingMetrics.descent = bmDen.descent + denShift;
// At this point the height of the slash is
// mBoundingMetrics.ascent + mBoundingMetrics.descent
// Ensure that it is greater than slashMinHeight
delta = (slashMinHeight -
(mBoundingMetrics.ascent + mBoundingMetrics.descent)) / 2;
if (delta > 0) {
mBoundingMetrics.ascent += delta;
mBoundingMetrics.descent += delta;
}
// Set the width of the slash
if (aWidthOnly) {
mLineRect.width = mLineThickness + slashMaxWidthConstant;
} else {
mLineRect.width = mLineThickness +
std::min(slashMaxWidthConstant,
(mBoundingMetrics.ascent + mBoundingMetrics.descent) /
slashRatio);
}
// Set horizontal bounding metrics
if (StyleVisibility()->mDirection) {
mBoundingMetrics.leftBearing = trailingSpace + bmDen.leftBearing;
mBoundingMetrics.rightBearing = trailingSpace + bmDen.width + mLineRect.width + bmNum.rightBearing;
} else {
mBoundingMetrics.leftBearing = leadingSpace + bmNum.leftBearing;
mBoundingMetrics.rightBearing = leadingSpace + bmNum.width + mLineRect.width + bmDen.rightBearing;
}
mBoundingMetrics.width =
leadingSpace + bmNum.width + mLineRect.width + bmDen.width +
trailingSpace;
// Set aDesiredSize
aDesiredSize.SetBlockStartAscent(mBoundingMetrics.ascent + padding);
aDesiredSize.Height() =
mBoundingMetrics.ascent + mBoundingMetrics.descent + 2 * padding;
aDesiredSize.Width() = mBoundingMetrics.width;
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
mReference.x = 0;
mReference.y = aDesiredSize.BlockStartAscent();
if (aPlaceOrigin) {
nscoord dx, dy;
// place numerator
dx = MirrorIfRTL(aDesiredSize.Width(), sizeNum.Width(),
leadingSpace);
dy = aDesiredSize.BlockStartAscent() - numShift - sizeNum.BlockStartAscent();
FinishReflowChild(frameNum, presContext, sizeNum, nullptr, dx, dy, 0);
// place the fraction bar
dx = MirrorIfRTL(aDesiredSize.Width(), mLineRect.width,
leadingSpace + bmNum.width);
dy = aDesiredSize.BlockStartAscent() - mBoundingMetrics.ascent;
mLineRect.SetRect(dx, dy,
mLineRect.width, aDesiredSize.Height() - 2 * padding);
// place denominator
dx = MirrorIfRTL(aDesiredSize.Width(), sizeDen.Width(),
leadingSpace + bmNum.width + mLineRect.width);
dy = aDesiredSize.BlockStartAscent() + denShift - sizeDen.BlockStartAscent();
FinishReflowChild(frameDen, presContext, sizeDen, nullptr, dx, dy, 0);
}
}
return NS_OK;
}
class nsDisplayMathMLSlash : public nsDisplayItem {
public:
nsDisplayMathMLSlash(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsRect& aRect,
nscoord aThickness, bool aRTL)
: nsDisplayItem(aBuilder, aFrame), mRect(aRect), mThickness(aThickness),
mRTL(aRTL) {
MOZ_COUNT_CTOR(nsDisplayMathMLSlash);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayMathMLSlash() {
MOZ_COUNT_DTOR(nsDisplayMathMLSlash);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) override;
NS_DISPLAY_DECL_NAME("MathMLSlash", TYPE_MATHML_SLASH)
private:
nsRect mRect;
nscoord mThickness;
bool mRTL;
};
void nsDisplayMathMLSlash::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
DrawTarget& aDrawTarget = *aCtx->GetDrawTarget();
// get the gfxRect
nsPresContext* presContext = mFrame->PresContext();
Rect rect = NSRectToRect(mRect + ToReferenceFrame(),
presContext->AppUnitsPerDevPixel());
ColorPattern color(ToDeviceColor(
mFrame->GetVisitedDependentColor(eCSSProperty__webkit_text_fill_color)));
// draw the slash as a parallelogram
Point delta = Point(presContext->AppUnitsToGfxUnits(mThickness), 0);
RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
if (mRTL) {
builder->MoveTo(rect.TopLeft());
builder->LineTo(rect.TopLeft() + delta);
builder->LineTo(rect.BottomRight());
builder->LineTo(rect.BottomRight() - delta);
} else {
builder->MoveTo(rect.BottomLeft());
builder->LineTo(rect.BottomLeft() + delta);
builder->LineTo(rect.TopRight());
builder->LineTo(rect.TopRight() - delta);
}
RefPtr<Path> path = builder->Finish();
aDrawTarget.Fill(path, color);
}
void
nsMathMLmfracFrame::DisplaySlash(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsRect& aRect,
nscoord aThickness,
const nsDisplayListSet& aLists) {
if (!aFrame->StyleVisibility()->IsVisible() || aRect.IsEmpty())
return;
aLists.Content()->AppendNewToTop(new (aBuilder)
nsDisplayMathMLSlash(aBuilder, aFrame, aRect, aThickness,
StyleVisibility()->mDirection));
}
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