bool nsView::WindowResized(nsIWidget* aWidget, int32_t aWidth, int32_t aHeight) { // The root view may not be set if this is the resize associated with // window creation SetForcedRepaint(true); if (this == mViewManager->GetRootView()) { RefPtr<nsDeviceContext> devContext = mViewManager->GetDeviceContext(); // ensure DPI is up-to-date, in case of window being opened and sized // on a non-default-dpi display (bug 829963) devContext->CheckDPIChange(); int32_t p2a = devContext->AppUnitsPerDevPixel(); mViewManager->SetWindowDimensions(NSIntPixelsToAppUnits(aWidth, p2a), NSIntPixelsToAppUnits(aHeight, p2a)); nsXULPopupManager* pm = nsXULPopupManager::GetInstance(); if (pm) { nsIPresShell* presShell = mViewManager->GetPresShell(); if (presShell && presShell->GetDocument()) { pm->AdjustPopupsOnWindowChange(presShell); } } return true; } else if (IsPopupWidget(aWidget)) { nsXULPopupManager* pm = nsXULPopupManager::GetInstance(); if (pm) { pm->PopupResized(mFrame, LayoutDeviceIntSize(aWidth, aHeight)); return true; } } return false; }
/* virtual */ nsresult nsMathMLmunderoverFrame::Place(DrawTarget* aDrawTarget, bool aPlaceOrigin, ReflowOutput& aDesiredSize) { float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this); if (NS_MATHML_EMBELLISH_IS_MOVABLELIMITS(mEmbellishData.flags) && StyleFont()->mMathDisplay == NS_MATHML_DISPLAYSTYLE_INLINE) { //place like sub sup or subsup if (mContent->IsMathMLElement(nsGkAtoms::munderover_)) { return nsMathMLmmultiscriptsFrame::PlaceMultiScript(PresContext(), aDrawTarget, aPlaceOrigin, aDesiredSize, this, 0, 0, fontSizeInflation); } else if (mContent->IsMathMLElement( nsGkAtoms::munder_)) { return nsMathMLmmultiscriptsFrame::PlaceMultiScript(PresContext(), aDrawTarget, aPlaceOrigin, aDesiredSize, this, 0, 0, fontSizeInflation); } else { NS_ASSERTION(mContent->IsMathMLElement(nsGkAtoms::mover_), "mContent->NodeInfo()->NameAtom() not recognized"); return nsMathMLmmultiscriptsFrame::PlaceMultiScript(PresContext(), aDrawTarget, aPlaceOrigin, aDesiredSize, this, 0, 0, fontSizeInflation); } } //////////////////////////////////// // Get the children's desired sizes nsBoundingMetrics bmBase, bmUnder, bmOver; ReflowOutput baseSize(aDesiredSize.GetWritingMode()); ReflowOutput underSize(aDesiredSize.GetWritingMode()); ReflowOutput 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 (mContent->IsAnyOfMathMLElements(nsGkAtoms::munder_, nsGkAtoms::munderover_)) { underFrame = baseFrame->GetNextSibling(); } else if (mContent->IsMathMLElement(nsGkAtoms::mover_)) { overFrame = baseFrame->GetNextSibling(); } } if (underFrame && mContent->IsMathMLElement(nsGkAtoms::munderover_)) { overFrame = underFrame->GetNextSibling(); } if (mContent->IsMathMLElement(nsGkAtoms::munder_)) { if (!baseFrame || !underFrame || underFrame->GetNextSibling()) { // report an error, encourage people to get their markups in order haveError = true; } } if (mContent->IsMathMLElement(nsGkAtoms::mover_)) { if (!baseFrame || !overFrame || overFrame->GetNextSibling()) { // report an error, encourage people to get their markups in order haveError = true; } } if (mContent->IsMathMLElement(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(aDrawTarget, aDesiredSize); } GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase); if (underFrame) { GetReflowAndBoundingMetricsFor(underFrame, underSize, bmUnder); } if (overFrame) { GetReflowAndBoundingMetricsFor(overFrame, overSize, bmOver); } nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1); //////////////////// // Place Children RefPtr<nsFontMetrics> fm = nsLayoutUtils::GetFontMetricsForFrame(this, fontSizeInflation); nscoord xHeight = fm->XHeight(); nscoord oneDevPixel = fm->AppUnitsPerDevPixel(); gfxFont* mathFont = fm->GetThebesFontGroup()->GetFirstMathFont(); nscoord ruleThickness; GetRuleThickness (aDrawTarget, fm, ruleThickness); nscoord correction = 0; GetItalicCorrection (bmBase, correction); // there are 2 different types of placement depending on // whether we want an accented under or not nscoord underDelta1 = 0; // gap between base and underscript nscoord underDelta2 = 0; // extra space beneath underscript if (!NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags)) { // Rule 13a, App. G, TeXbook nscoord bigOpSpacing2, bigOpSpacing4, bigOpSpacing5, dummy; GetBigOpSpacings (fm, dummy, bigOpSpacing2, dummy, bigOpSpacing4, bigOpSpacing5); if (mathFont) { // XXXfredw The Open Type MATH table has some StretchStack* parameters // that we may use when the base is a stretchy horizontal operator. See // bug 963131. bigOpSpacing2 = mathFont->GetMathConstant(gfxFontEntry::LowerLimitGapMin, oneDevPixel); bigOpSpacing4 = mathFont->GetMathConstant(gfxFontEntry::LowerLimitBaselineDropMin, oneDevPixel); bigOpSpacing5 = 0; } underDelta1 = std::max(bigOpSpacing2, (bigOpSpacing4 - bmUnder.ascent)); underDelta2 = bigOpSpacing5; } else { // No corresponding rule in TeXbook - we are on our own here // XXX tune the gap delta between base and underscript // XXX Should we use Rule 10 like \underline does? // XXXfredw Perhaps use the Underbar* parameters of the MATH table. See // bug 963125. underDelta1 = ruleThickness + onePixel/2; underDelta2 = ruleThickness; } // empty under? if (!(bmUnder.ascent + bmUnder.descent)) { underDelta1 = 0; underDelta2 = 0; } nscoord overDelta1 = 0; // gap between base and overscript nscoord overDelta2 = 0; // extra space above overscript if (!NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)) { // Rule 13a, App. G, TeXbook // XXXfredw The Open Type MATH table has some StretchStack* parameters // that we may use when the base is a stretchy horizontal operator. See // bug 963131. nscoord bigOpSpacing1, bigOpSpacing3, bigOpSpacing5, dummy; GetBigOpSpacings (fm, bigOpSpacing1, dummy, bigOpSpacing3, dummy, bigOpSpacing5); if (mathFont) { // XXXfredw The Open Type MATH table has some StretchStack* parameters // that we may use when the base is a stretchy horizontal operator. See // bug 963131. bigOpSpacing1 = mathFont->GetMathConstant(gfxFontEntry::UpperLimitGapMin, oneDevPixel); bigOpSpacing3 = mathFont->GetMathConstant(gfxFontEntry::UpperLimitBaselineRiseMin, oneDevPixel); bigOpSpacing5 = 0; } overDelta1 = std::max(bigOpSpacing1, (bigOpSpacing3 - bmOver.descent)); overDelta2 = bigOpSpacing5; // XXX This is not a TeX rule... // delta1 (as computed abvove) can become really big when bmOver.descent is // negative, e.g., if the content is &OverBar. In such case, we use the height if (bmOver.descent < 0) overDelta1 = std::max(bigOpSpacing1, (bigOpSpacing3 - (bmOver.ascent + bmOver.descent))); } else { // Rule 12, App. G, TeXbook // We are going to modify this rule to make it more general. // The idea behind Rule 12 in the TeXBook is to keep the accent // as close to the base as possible, while ensuring that the // distance between the *baseline* of the accent char and // the *baseline* of the base is atleast x-height. // The idea is that for normal use, we would like all the accents // on a line to line up atleast x-height above the baseline // if possible. // When the ascent of the base is >= x-height, // the baseline of the accent char is placed just above the base // (specifically, the baseline of the accent char is placed // above the baseline of the base by the ascent of the base). // For ease of implementation, // this assumes that the font-designer designs accents // in such a way that the bottom of the accent is atleast x-height // above its baseline, otherwise there will be collisions // with the base. Also there should be proper padding between // the bottom of the accent char and its baseline. // The above rule may not be obvious from a first // reading of rule 12 in the TeXBook !!! // The mathml <mover> tag can use accent chars that // do not follow this convention. So we modify TeX's rule // so that TeX's rule gets subsumed for accents that follow // TeX's convention, // while also allowing accents that do not follow the convention : // we try to keep the *bottom* of the accent char atleast x-height // from the baseline of the base char. we also slap on an extra // padding between the accent and base chars. overDelta1 = ruleThickness + onePixel/2; nscoord accentBaseHeight = xHeight; if (mathFont) { accentBaseHeight = mathFont->GetMathConstant(gfxFontEntry::AccentBaseHeight, oneDevPixel); } if (bmBase.ascent < accentBaseHeight) { // also ensure at least accentBaseHeight above the baseline of the base overDelta1 += accentBaseHeight - bmBase.ascent; } overDelta2 = ruleThickness; } // empty over? if (!(bmOver.ascent + bmOver.descent)) { overDelta1 = 0; overDelta2 = 0; } nscoord dxBase = 0, dxOver = 0, dxUnder = 0; nsAutoString valueAlign; enum { center, left, right } alignPosition = center; if (mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::align, valueAlign)) { if (valueAlign.EqualsLiteral("left")) { alignPosition = left; } else if (valueAlign.EqualsLiteral("right")) { alignPosition = right; } } ////////// // pass 1, do what <mover> does: attach the overscript on the base // Ad-hoc - This is to override fonts which have ready-made _accent_ // glyphs with negative lbearing and rbearing. We want to position // the overscript ourselves nscoord overWidth = bmOver.width; if (!overWidth && (bmOver.rightBearing - bmOver.leftBearing > 0)) { overWidth = bmOver.rightBearing - bmOver.leftBearing; dxOver = -bmOver.leftBearing; } if (NS_MATHML_EMBELLISH_IS_ACCENTOVER(mEmbellishData.flags)) { mBoundingMetrics.width = bmBase.width; if (alignPosition == center) { dxOver += correction; } } else { mBoundingMetrics.width = std::max(bmBase.width, overWidth); if (alignPosition == center) { dxOver += correction/2; } } if (alignPosition == center) { dxOver += (mBoundingMetrics.width - overWidth)/2; dxBase = (mBoundingMetrics.width - bmBase.width)/2; } else if (alignPosition == right) { dxOver += mBoundingMetrics.width - overWidth; dxBase = mBoundingMetrics.width - bmBase.width; } mBoundingMetrics.ascent = bmBase.ascent + overDelta1 + bmOver.ascent + bmOver.descent; mBoundingMetrics.descent = bmBase.descent; mBoundingMetrics.leftBearing = std::min(dxBase + bmBase.leftBearing, dxOver + bmOver.leftBearing); mBoundingMetrics.rightBearing = std::max(dxBase + bmBase.rightBearing, dxOver + bmOver.rightBearing); ////////// // pass 2, do what <munder> does: attach the underscript on the previous // result. We conceptually view the previous result as an "anynomous base" // from where to attach the underscript. Hence if the underscript is empty, // we should end up like <mover>. If the overscript is empty, we should // end up like <munder>. nsBoundingMetrics bmAnonymousBase = mBoundingMetrics; nscoord ascentAnonymousBase = std::max(mBoundingMetrics.ascent + overDelta2, overSize.BlockStartAscent() + bmOver.descent + overDelta1 + bmBase.ascent); ascentAnonymousBase = std::max(ascentAnonymousBase, baseSize.BlockStartAscent()); // Width of non-spacing marks is zero so use left and right bearing. nscoord underWidth = bmUnder.width; if (!underWidth) { underWidth = bmUnder.rightBearing - bmUnder.leftBearing; dxUnder = -bmUnder.leftBearing; } nscoord maxWidth = std::max(bmAnonymousBase.width, underWidth); if (alignPosition == center && !NS_MATHML_EMBELLISH_IS_ACCENTUNDER(mEmbellishData.flags)) { GetItalicCorrection(bmAnonymousBase, correction); dxUnder += -correction/2; } nscoord dxAnonymousBase = 0; if (alignPosition == center) { dxUnder += (maxWidth - underWidth)/2; dxAnonymousBase = (maxWidth - bmAnonymousBase.width)/2; } else if (alignPosition == right) { dxUnder += maxWidth - underWidth; dxAnonymousBase = maxWidth - bmAnonymousBase.width; } // adjust the offsets of the real base and overscript since their // final offsets should be relative to us... dxOver += dxAnonymousBase; dxBase += dxAnonymousBase; mBoundingMetrics.width = std::max(dxAnonymousBase + bmAnonymousBase.width, dxUnder + bmUnder.width); // At this point, mBoundingMetrics.ascent = bmAnonymousBase.ascent mBoundingMetrics.descent = bmAnonymousBase.descent + underDelta1 + bmUnder.ascent + bmUnder.descent; mBoundingMetrics.leftBearing = std::min(dxAnonymousBase + bmAnonymousBase.leftBearing, dxUnder + bmUnder.leftBearing); mBoundingMetrics.rightBearing = std::max(dxAnonymousBase + bmAnonymousBase.rightBearing, dxUnder + bmUnder.rightBearing); aDesiredSize.SetBlockStartAscent(ascentAnonymousBase); aDesiredSize.Height() = aDesiredSize.BlockStartAscent() + std::max(mBoundingMetrics.descent + underDelta2, bmAnonymousBase.descent + underDelta1 + bmUnder.ascent + underSize.Height() - underSize.BlockStartAscent()); aDesiredSize.Height() = std::max(aDesiredSize.Height(), aDesiredSize.BlockStartAscent() + baseSize.Height() - baseSize.BlockStartAscent()); aDesiredSize.Width() = mBoundingMetrics.width; aDesiredSize.mBoundingMetrics = mBoundingMetrics; mReference.x = 0; mReference.y = aDesiredSize.BlockStartAscent(); if (aPlaceOrigin) { nscoord dy; // place overscript if (overFrame) { dy = aDesiredSize.BlockStartAscent() - mBoundingMetrics.ascent + bmOver.ascent - overSize.BlockStartAscent(); FinishReflowChild (overFrame, PresContext(), overSize, nullptr, dxOver, dy, 0); } // place base dy = aDesiredSize.BlockStartAscent() - baseSize.BlockStartAscent(); FinishReflowChild (baseFrame, PresContext(), baseSize, nullptr, dxBase, dy, 0); // place underscript if (underFrame) { dy = aDesiredSize.BlockStartAscent() + mBoundingMetrics.descent - bmUnder.descent - underSize.BlockStartAscent(); FinishReflowChild (underFrame, PresContext(), underSize, nullptr, dxUnder, dy, 0); } } return NS_OK; }
// exported routine that both munderover and mmultiscripts share. // munderover uses this when movablelimits is set. nsresult nsMathMLmmultiscriptsFrame::PlaceMultiScript(nsPresContext* aPresContext, nsRenderingContext& aRenderingContext, bool aPlaceOrigin, nsHTMLReflowMetrics& aDesiredSize, nsMathMLContainerFrame* aFrame, nscoord aUserSubScriptShift, nscoord aUserSupScriptShift, float aFontSizeInflation) { nsIAtom* tag = aFrame->GetContent()->NodeInfo()->NameAtom(); // This function deals with both munderover etc. as well as msubsup etc. // As the former behaves identically to the later, we treat it as such // to avoid additional checks later. if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::mover_)) tag = nsGkAtoms::msup_; else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munder_)) tag = nsGkAtoms::msub_; else if (aFrame->GetContent()->IsMathMLElement(nsGkAtoms::munderover_)) tag = nsGkAtoms::msubsup_; nsBoundingMetrics bmFrame; nscoord minShiftFromXHeight, subDrop, supDrop; //////////////////////////////////////// // Initialize super/sub shifts that // depend only on the current font //////////////////////////////////////// nsIFrame* baseFrame = aFrame->GetFirstPrincipalChild(); if (!baseFrame) { if (tag == nsGkAtoms::mmultiscripts_) aFrame->ReportErrorToConsole("NoBase"); else aFrame->ReportChildCountError(); return aFrame->ReflowError(aRenderingContext, aDesiredSize); } // get x-height (an ex) const nsStyleFont* font = aFrame->StyleFont(); RefPtr<nsFontMetrics> fm; nsLayoutUtils::GetFontMetricsForFrame(baseFrame, getter_AddRefs(fm), aFontSizeInflation); nscoord xHeight = fm->XHeight(); nscoord oneDevPixel = fm->AppUnitsPerDevPixel(); gfxFont* mathFont = fm->GetThebesFontGroup()->GetFirstMathFont(); // scriptspace from TeX for extra spacing after sup/subscript nscoord scriptSpace; if (mathFont) { scriptSpace = mathFont->GetMathConstant(gfxFontEntry::SpaceAfterScript, oneDevPixel); } else { // (0.5pt in plain TeX) scriptSpace = nsPresContext::CSSPointsToAppUnits(0.5f); } // force the scriptSpace to be at least 1 pixel nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1); scriptSpace = std::max(onePixel, scriptSpace); ///////////////////////////////////// // first the shift for the subscript nscoord subScriptShift; if (mathFont) { // Try and get the sub script shift from the MATH table. Note that contrary // to TeX we only have one parameter. subScriptShift = mathFont->GetMathConstant(gfxFontEntry::SubscriptShiftDown, oneDevPixel); } else { // subScriptShift{1,2} // = minimum amount to shift the subscript down // = sub{1,2} in TeXbook // subScriptShift1 = subscriptshift attribute * x-height nscoord subScriptShift1, subScriptShift2; // Get subScriptShift{1,2} default from font GetSubScriptShifts (fm, subScriptShift1, subScriptShift2); if (tag == nsGkAtoms::msub_) { subScriptShift = subScriptShift1; } else { subScriptShift = std::max(subScriptShift1, subScriptShift2); } } if (0 < aUserSubScriptShift) { // the user has set the subscriptshift attribute subScriptShift = std::max(subScriptShift, aUserSubScriptShift); } ///////////////////////////////////// // next the shift for the superscript nscoord supScriptShift; nsPresentationData presentationData; aFrame->GetPresentationData(presentationData); if (mathFont) { // Try and get the super script shift from the MATH table. Note that // contrary to TeX we only have two parameters. supScriptShift = mathFont-> GetMathConstant(NS_MATHML_IS_COMPRESSED(presentationData.flags) ? gfxFontEntry::SuperscriptShiftUpCramped : gfxFontEntry::SuperscriptShiftUp, oneDevPixel); } else { // supScriptShift{1,2,3} // = minimum amount to shift the supscript up // = 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. // Note that only msup starts with a superscript. bool isSubScript = (tag != nsGkAtoms::msup_); nsIFrame* childFrame = aFrame->GetFirstPrincipalChild(); while (childFrame) { if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::mprescripts_)) { if (tag != nsGkAtoms::mmultiscripts_) { if (aPlaceOrigin) { aFrame->ReportInvalidChildError(nsGkAtoms::mprescripts_); } return aFrame->ReflowError(aRenderingContext, aDesiredSize); } if (prescriptsFrame) { // duplicate <mprescripts/> found // report an error, encourage people to get their markups in order if (aPlaceOrigin) { aFrame->ReportErrorToConsole("DuplicateMprescripts"); } return aFrame->ReflowError(aRenderingContext, aDesiredSize); } if (!isSubScript) { if (aPlaceOrigin) { aFrame->ReportErrorToConsole("SubSupMismatch"); } return aFrame->ReflowError(aRenderingContext, aDesiredSize); } prescriptsFrame = childFrame; firstPrescriptsPair = true; } else if (0 == count) { // base if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::none)) { if (tag == nsGkAtoms::mmultiscripts_) { if (aPlaceOrigin) { aFrame->ReportErrorToConsole("NoBase"); } return aFrame->ReflowError(aRenderingContext, aDesiredSize); } else { //A different error message is triggered later for the other tags foundNoneTag = true; } } baseFrame = childFrame; GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase); if (tag != nsGkAtoms::msub_) { // Apply italics correction if there is the potential for a // postsupscript. GetItalicCorrection(bmBase, italicCorrection); // If italics correction is applied, we always add "a little to spare" // (see TeXbook Ch.11, p.64), as we estimate the italic creation // ourselves and it isn't the same as TeX. italicCorrection += onePixel; } // we update boundingMetrics.{ascent,descent} with that // of the baseFrame only after processing all the sup/sub pairs boundingMetrics.width = bmBase.width; boundingMetrics.rightBearing = bmBase.rightBearing; boundingMetrics.leftBearing = bmBase.leftBearing; // until overwritten } else { // super/subscript block if (childFrame->GetContent()->IsMathMLElement(nsGkAtoms::none)) { foundNoneTag = true; } if (isSubScript) { // subscript subScriptFrame = childFrame; GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript); // get the subdrop from the subscript font GetSubDropFromChild (subScriptFrame, subDrop, aFontSizeInflation); // parameter v, Rule 18a, App. G, TeXbook minSubScriptShift = bmBase.descent + subDrop; trySubScriptShift = std::max(minSubScriptShift,subScriptShift); multiSubSize.SetBlockStartAscent( std::max(multiSubSize.BlockStartAscent(), subScriptSize.BlockStartAscent())); bmMultiSub.ascent = std::max(bmMultiSub.ascent, bmSubScript.ascent); bmMultiSub.descent = std::max(bmMultiSub.descent, bmSubScript.descent); multiSubSize.Height() = std::max(multiSubSize.Height(), subScriptSize.Height() - subScriptSize.BlockStartAscent()); if (bmSubScript.width) width = bmSubScript.width + scriptSpace; rightBearing = bmSubScript.rightBearing; if (tag == nsGkAtoms::msub_) { boundingMetrics.rightBearing = boundingMetrics.width + rightBearing; boundingMetrics.width += width; nscoord subscriptTopMax; if (mathFont) { subscriptTopMax = mathFont->GetMathConstant(gfxFontEntry::SubscriptTopMax, oneDevPixel); } else { // get min subscript shift limit from x-height // = h(x) - 4/5 * sigma_5, Rule 18b, App. G, TeXbook subscriptTopMax = NSToCoordRound((4.0f/5.0f) * xHeight); } nscoord minShiftFromXHeight = bmSubScript.ascent - subscriptTopMax; maxSubScriptShift = std::max(trySubScriptShift,minShiftFromXHeight); maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift); trySubScriptShift = subScriptShift; } } else { // supscript supScriptFrame = childFrame; GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript); // get the supdrop from the supscript font GetSupDropFromChild (supScriptFrame, supDrop, aFontSizeInflation); // parameter u, Rule 18a, App. G, TeXbook minSupScriptShift = bmBase.ascent - supDrop; nscoord superscriptBottomMin; if (mathFont) { superscriptBottomMin = mathFont->GetMathConstant(gfxFontEntry::SuperscriptBottomMin, oneDevPixel); } else { // get min supscript shift limit from x-height // = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook superscriptBottomMin = NSToCoordRound((1.0f / 4.0f) * xHeight); } minShiftFromXHeight = bmSupScript.descent + superscriptBottomMin; trySupScriptShift = std::max(minSupScriptShift, std::max(minShiftFromXHeight, supScriptShift)); multiSupSize.SetBlockStartAscent( std::max(multiSupSize.BlockStartAscent(), supScriptSize.BlockStartAscent())); bmMultiSup.ascent = std::max(bmMultiSup.ascent, bmSupScript.ascent); bmMultiSup.descent = std::max(bmMultiSup.descent, bmSupScript.descent); multiSupSize.Height() = std::max(multiSupSize.Height(), supScriptSize.Height() - supScriptSize.BlockStartAscent()); if (bmSupScript.width) width = std::max(width, bmSupScript.width + scriptSpace); if (!prescriptsFrame) { // we are still looping over base & postscripts rightBearing = std::max(rightBearing, italicCorrection + bmSupScript.rightBearing); boundingMetrics.rightBearing = boundingMetrics.width + rightBearing; boundingMetrics.width += width; } else { prescriptsWidth += width; if (firstPrescriptsPair) { firstPrescriptsPair = false; boundingMetrics.leftBearing = std::min(bmSubScript.leftBearing, bmSupScript.leftBearing); } } width = rightBearing = 0; // negotiate between the various shifts so that // there is enough gap between the sup and subscripts // Rule 18e, App. G, TeXbook if (tag == nsGkAtoms::mmultiscripts_ || tag == nsGkAtoms::msubsup_) { nscoord subSuperscriptGapMin; if (mathFont) { subSuperscriptGapMin = mathFont->GetMathConstant(gfxFontEntry::SubSuperscriptGapMin, oneDevPixel); } else { nscoord ruleSize; GetRuleThickness(aRenderingContext, fm, ruleSize); subSuperscriptGapMin = 4 * ruleSize; } nscoord gap = (trySupScriptShift - bmSupScript.descent) - (bmSubScript.ascent - trySubScriptShift); if (gap < subSuperscriptGapMin) { // adjust trySubScriptShift to get a gap of subSuperscriptGapMin trySubScriptShift += subSuperscriptGapMin - gap; } // next we want to ensure that the bottom of the superscript // will be > superscriptBottomMaxWithSubscript nscoord superscriptBottomMaxWithSubscript; if (mathFont) { superscriptBottomMaxWithSubscript = mathFont-> GetMathConstant(gfxFontEntry::SuperscriptBottomMaxWithSubscript, oneDevPixel); } else { superscriptBottomMaxWithSubscript = NSToCoordRound((4.0f / 5.0f) * xHeight); } gap = superscriptBottomMaxWithSubscript - (trySupScriptShift - bmSupScript.descent); if (gap > 0) { trySupScriptShift += gap; trySubScriptShift -= gap; } } maxSubScriptShift = std::max(maxSubScriptShift, trySubScriptShift); maxSupScriptShift = std::max(maxSupScriptShift, trySupScriptShift); trySubScriptShift = subScriptShift; trySupScriptShift = supScriptShift; } isSubScript = !isSubScript; } count++; childFrame = childFrame->GetNextSibling(); } //NoBase error may also have been reported above if ((count != 2 && (tag == nsGkAtoms::msup_ || tag == nsGkAtoms::msub_)) || (count != 3 && tag == nsGkAtoms::msubsup_) || !baseFrame || (foundNoneTag && tag != nsGkAtoms::mmultiscripts_) || (!isSubScript && tag == nsGkAtoms::mmultiscripts_)) { // report an error, encourage people to get their markups in order if (aPlaceOrigin) { if ((count != 2 && (tag == nsGkAtoms::msup_ || tag == nsGkAtoms::msub_)) || (count != 3 && tag == nsGkAtoms::msubsup_ )) { aFrame->ReportChildCountError(); } else if (foundNoneTag && tag != nsGkAtoms::mmultiscripts_) { aFrame->ReportInvalidChildError(nsGkAtoms::none); } else if (!baseFrame) { aFrame->ReportErrorToConsole("NoBase"); } else { aFrame->ReportErrorToConsole("SubSupMismatch"); } } return aFrame->ReflowError(aRenderingContext, aDesiredSize); } // we left out the width of prescripts, so ... boundingMetrics.rightBearing += prescriptsWidth; boundingMetrics.width += prescriptsWidth; // Zero out the shifts in where a frame isn't present to avoid the potential // for overflow. if (!subScriptFrame) maxSubScriptShift = 0; if (!supScriptFrame) maxSupScriptShift = 0; // we left out the base during our bounding box updates, so ... if (tag == nsGkAtoms::msub_) { boundingMetrics.ascent = std::max(bmBase.ascent, bmMultiSub.ascent - maxSubScriptShift); } else { boundingMetrics.ascent = std::max(bmBase.ascent, (bmMultiSup.ascent + maxSupScriptShift)); } if (tag == nsGkAtoms::msup_) { boundingMetrics.descent = std::max(bmBase.descent, bmMultiSup.descent - maxSupScriptShift); } else { boundingMetrics.descent = std::max(bmBase.descent, (bmMultiSub.descent + maxSubScriptShift)); } aFrame->SetBoundingMetrics(boundingMetrics); // get the reflow metrics ... aDesiredSize.SetBlockStartAscent( std::max(baseSize.BlockStartAscent(), std::max(multiSubSize.BlockStartAscent() - maxSubScriptShift, multiSupSize.BlockStartAscent() + maxSupScriptShift))); aDesiredSize.Height() = aDesiredSize.BlockStartAscent() + std::max(baseSize.Height() - baseSize.BlockStartAscent(), std::max(multiSubSize.Height() + maxSubScriptShift, multiSupSize.Height() - maxSupScriptShift)); aDesiredSize.Width() = boundingMetrics.width; aDesiredSize.mBoundingMetrics = boundingMetrics; aFrame->SetReference(nsPoint(0, aDesiredSize.BlockStartAscent())); ////////////////// // Place Children // Place prescripts, followed by base, and then postscripts. // The list of frames is in the order: {base} {postscripts} {prescripts} // We go over the list in a circular manner, starting at <prescripts/> if (aPlaceOrigin) { nscoord dx = 0, dy = 0; // With msub and msup there is only one element and // subscriptFrame/supScriptFrame have already been set above where // relevant. In these cases we skip to the reflow part. if (tag == nsGkAtoms::msub_ || tag == nsGkAtoms::msup_) count = 1; else count = 0; childFrame = prescriptsFrame; bool isPreScript = true; do { if (!childFrame) { // end of prescripts, isPreScript = false; // place the base ... childFrame = baseFrame; dy = aDesiredSize.BlockStartAscent() - baseSize.BlockStartAscent(); FinishReflowChild (baseFrame, aPresContext, baseSize, nullptr, aFrame->MirrorIfRTL(aDesiredSize.Width(), baseSize.Width(), dx), dy, 0); dx += bmBase.width; } else if (prescriptsFrame == childFrame) { // Clear reflow flags of prescripts frame. prescriptsFrame->DidReflow(aPresContext, nullptr, nsDidReflowStatus::FINISHED); } else { // process each sup/sub pair if (0 == count) { subScriptFrame = childFrame; count = 1; } else if (1 == count) { if (tag != nsGkAtoms::msub_) supScriptFrame = childFrame; count = 0; // get the ascent/descent of sup/subscripts stored in their rects // rect.x = descent, rect.y = ascent if (subScriptFrame) GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript); if (supScriptFrame) GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript); width = std::max(subScriptSize.Width(), supScriptSize.Width()); if (subScriptFrame) { nscoord x = dx; // prescripts should be right aligned // https://bugzilla.mozilla.org/show_bug.cgi?id=928675 if (isPreScript) x += width - subScriptSize.Width(); dy = aDesiredSize.BlockStartAscent() - subScriptSize.BlockStartAscent() + maxSubScriptShift; FinishReflowChild (subScriptFrame, aPresContext, subScriptSize, nullptr, aFrame->MirrorIfRTL(aDesiredSize.Width(), subScriptSize.Width(), x), dy, 0); } if (supScriptFrame) { nscoord x = dx; if (isPreScript) { x += width - supScriptSize.Width(); } else { // post superscripts are shifted by the italic correction value x += italicCorrection; } dy = aDesiredSize.BlockStartAscent() - supScriptSize.BlockStartAscent() - maxSupScriptShift; FinishReflowChild (supScriptFrame, aPresContext, supScriptSize, nullptr, aFrame->MirrorIfRTL(aDesiredSize.Width(), supScriptSize.Width(), x), dy, 0); } dx += width + scriptSpace; } } childFrame = childFrame->GetNextSibling(); } while (prescriptsFrame != childFrame); } return NS_OK; }
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->GetMathConstant(gfxFontEntry::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-> GetMathConstant(displayStyle ? gfxFontEntry::StackTopDisplayStyleShiftUp : gfxFontEntry::StackTopShiftUp, oneDevPixel); denShift = mathFont-> GetMathConstant(displayStyle ? gfxFontEntry::StackBottomDisplayStyleShiftDown : gfxFontEntry::StackBottomShiftDown, oneDevPixel); } } else { numShift = displayStyle ? numShift1 : numShift2; denShift = displayStyle ? denShift1 : denShift2; if (mathFont) { numShift = mathFont-> GetMathConstant(displayStyle ? gfxFontEntry::FractionNumeratorDisplayStyleShiftUp : gfxFontEntry::FractionNumeratorShiftUp, oneDevPixel); denShift = mathFont-> GetMathConstant( displayStyle ? gfxFontEntry::FractionDenominatorDisplayStyleShiftDown : gfxFontEntry::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->GetMathConstant(displayStyle ? gfxFontEntry::StackDisplayStyleGapMin : gfxFontEntry::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-> GetMathConstant(displayStyle ? gfxFontEntry::FractionNumDisplayStyleGapMin : gfxFontEntry::FractionNumeratorGapMin, oneDevPixel); minClearanceDen = mathFont-> GetMathConstant(displayStyle ? gfxFontEntry::FractionDenomDisplayStyleGapMin : gfxFontEntry::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; }