LCOV - app.info - layout/mathml/nsMathMLmrootFrame.cpp

LCOV - code coverage report
| Current view: | directory - layout/mathml - nsMathMLmrootFrame.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 173 | 0 | 0.0 %
| Date: | 2012-04-21 | Functions: | 14 | 0 | 0.0 %

           1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
           2                 : /* ***** BEGIN LICENSE BLOCK *****
           3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           4                 :  *
           5                 :  * The contents of this file are subject to the Mozilla Public License Version
           6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           7                 :  * the License. You may obtain a copy of the License at
           8                 :  * http://www.mozilla.org/MPL/
           9                 :  *
          10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          12                 :  * for the specific language governing rights and limitations under the
          13                 :  * License.
          14                 :  *
          15                 :  * The Original Code is Mozilla MathML Project.
          16                 :  *
          17                 :  * The Initial Developer of the Original Code is
          18                 :  * The University Of Queensland.
          19                 :  * Portions created by the Initial Developer are Copyright (C) 1999
          20                 :  * the Initial Developer. All Rights Reserved.
          21                 :  *
          22                 :  * Contributor(s):
          23                 :  *   Roger B. Sidje <rbs@maths.uq.edu.au>
          24                 :  *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
          25                 :  *   Vilya Harvey <vilya@nag.co.uk>
          26                 :  *   Shyjan Mahamud <mahamud@cs.cmu.edu>
          27                 :  *
          28                 :  * Alternatively, the contents of this file may be used under the terms of
          29                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
          30                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          31                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          32                 :  * of those above. If you wish to allow use of your version of this file only
          33                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          34                 :  * use your version of this file under the terms of the MPL, indicate your
          35                 :  * decision by deleting the provisions above and replace them with the notice
          36                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          37                 :  * the provisions above, a recipient may use your version of this file under
          38                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          39                 :  *
          40                 :  * ***** END LICENSE BLOCK ***** */
          41                 :
          42                 :
          43                 : #include "nsCOMPtr.h"
          44                 : #include "nsFrame.h"
          45                 : #include "nsPresContext.h"
          46                 : #include "nsStyleContext.h"
          47                 : #include "nsStyleConsts.h"
          48                 : #include "nsRenderingContext.h"
          49                 :
          50                 : #include "nsMathMLmrootFrame.h"
          51                 :
          52                 : //
          53                 : // <msqrt> and <mroot> -- form a radical - implementation
          54                 : //
          55                 :
          56                 : //NOTE:
          57                 : //  The code assumes that TeX fonts are picked.
          58                 : //  There is no fall-back to draw the branches of the sqrt explicitly
          59                 : //  in the case where TeX fonts are not there. In general, there are no
          60                 : //  fall-back(s) in MathML when some (freely-downloadable) fonts are missing.
          61                 : //  Otherwise, this will add much work and unnecessary complexity to the core
          62                 : //  MathML  engine. Assuming that authors have the free fonts is part of the
          63                 : //  deal. We are not responsible for cases of misconfigurations out there.
          64                 :
          65                 : // additional style context to be used by our MathMLChar.
          66                 : #define NS_SQR_CHAR_STYLE_CONTEXT_INDEX   0
          67                 :
          68                 : static const PRUnichar kSqrChar = PRUnichar(0x221A);
          69                 :
          70                 : nsIFrame*
          71               0 : NS_NewMathMLmrootFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
          72                 : {
          73               0 :   return new (aPresShell) nsMathMLmrootFrame(aContext);
          74                 : }
          75                 :
          76               0 : NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmrootFrame)
          77                 :
          78               0 : nsMathMLmrootFrame::nsMathMLmrootFrame(nsStyleContext* aContext) :
          79                 :   nsMathMLContainerFrame(aContext),
          80                 :   mSqrChar(),
          81               0 :   mBarRect()
          82                 : {
          83               0 : }
          84                 :
          85               0 : nsMathMLmrootFrame::~nsMathMLmrootFrame()
          86                 : {
          87               0 : }
          88                 :
          89                 : NS_IMETHODIMP
          90               0 : nsMathMLmrootFrame::Init(nsIContent*      aContent,
          91                 :                          nsIFrame*        aParent,
          92                 :                          nsIFrame*        aPrevInFlow)
          93                 : {
          94               0 :   nsresult rv = nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
          95                 :
          96               0 :   nsPresContext *presContext = PresContext();
          97                 :
          98                 :   // No need to track the style context given to our MathML char.
          99                 :   // The Style System will use Get/SetAdditionalStyleContext() to keep it
         100                 :   // up-to-date if dynamic changes arise.
         101               0 :   nsAutoString sqrChar; sqrChar.Assign(kSqrChar);
         102               0 :   mSqrChar.SetData(presContext, sqrChar);
         103               0 :   ResolveMathMLCharStyle(presContext, mContent, mStyleContext, &mSqrChar, true);
         104                 :
         105               0 :   return rv;
         106                 : }
         107                 :
         108                 : NS_IMETHODIMP
         109               0 : nsMathMLmrootFrame::TransmitAutomaticData()
         110                 : {
         111                 :   // 1. The REC says:
         112                 :   //    The <mroot> element increments scriptlevel by 2, and sets displaystyle to
         113                 :   //    "false", within index, but leaves both attributes unchanged within base.
         114                 :   // 2. The TeXbook (Ch 17. p.141) says \sqrt is compressed
         115                 :   UpdatePresentationDataFromChildAt(1, 1,
         116                 :     ~NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED,
         117               0 :      NS_MATHML_DISPLAYSTYLE | NS_MATHML_COMPRESSED);
         118                 :   UpdatePresentationDataFromChildAt(0, 0,
         119               0 :      NS_MATHML_COMPRESSED, NS_MATHML_COMPRESSED);
         120                 :
         121               0 :   return NS_OK;
         122                 : }
         123                 :
         124                 : NS_IMETHODIMP
         125               0 : nsMathMLmrootFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
         126                 :                                      const nsRect&           aDirtyRect,
         127                 :                                      const nsDisplayListSet& aLists)
         128                 : {
         129                 :   /////////////
         130                 :   // paint the content we are square-rooting
         131               0 :   nsresult rv = nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
         132               0 :   NS_ENSURE_SUCCESS(rv, rv);
         133                 :
         134                 :   /////////////
         135                 :   // paint the sqrt symbol
         136               0 :   if (!NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
         137               0 :     rv = mSqrChar.Display(aBuilder, this, aLists);
         138               0 :     NS_ENSURE_SUCCESS(rv, rv);
         139                 :
         140               0 :     rv = DisplayBar(aBuilder, this, mBarRect, aLists);
         141               0 :     NS_ENSURE_SUCCESS(rv, rv);
         142                 :
         143                 : #if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
         144                 :     // for visual debug
         145                 :     nsRect rect;
         146                 :     mSqrChar.GetRect(rect);
         147                 :     nsBoundingMetrics bm;
         148                 :     mSqrChar.GetBoundingMetrics(bm);
         149                 :     rv = DisplayBoundingMetrics(aBuilder, this, rect.TopLeft(), bm, aLists);
         150                 : #endif
         151                 :   }
         152                 :
         153               0 :   return rv;
         154                 : }
         155                 :
         156                 : static void
         157               0 : GetRadicalXOffsets(nscoord aIndexWidth, nscoord aSqrWidth,
         158                 :                    nsFontMetrics* aFontMetrics,
         159                 :                    nscoord* aIndexOffset, nscoord* aSqrOffset)
         160                 : {
         161                 :   // The index is tucked in closer to the radical while making sure
         162                 :   // that the kern does not make the index and radical collide
         163                 :   nscoord dxIndex, dxSqr;
         164               0 :   nscoord xHeight = aFontMetrics->XHeight();
         165               0 :   nscoord indexRadicalKern = NSToCoordRound(1.35f * xHeight);
         166               0 :   if (indexRadicalKern > aIndexWidth) {
         167               0 :     dxIndex = indexRadicalKern - aIndexWidth;
         168               0 :     dxSqr = 0;
         169                 :   }
         170                 :   else {
         171               0 :     dxIndex = 0;
         172               0 :     dxSqr = aIndexWidth - indexRadicalKern;
         173                 :   }
         174                 :   // avoid collision by leaving a minimum space between index and radical
         175               0 :   nscoord minimumClearance = aSqrWidth/2;
         176               0 :   if (dxIndex + aIndexWidth + minimumClearance > dxSqr + aSqrWidth) {
         177               0 :     if (aIndexWidth + minimumClearance < aSqrWidth) {
         178               0 :       dxIndex = aSqrWidth - (aIndexWidth + minimumClearance);
         179               0 :       dxSqr = 0;
         180                 :     }
         181                 :     else {
         182               0 :       dxIndex = 0;
         183               0 :       dxSqr = (aIndexWidth + minimumClearance) - aSqrWidth;
         184                 :     }
         185                 :   }
         186                 :
         187               0 :   if (aIndexOffset)
         188               0 :     *aIndexOffset = dxIndex;
         189               0 :   if (aSqrOffset)
         190               0 :     *aSqrOffset = dxSqr;
         191               0 : }
         192                 :
         193                 : NS_IMETHODIMP
         194               0 : nsMathMLmrootFrame::Reflow(nsPresContext*          aPresContext,
         195                 :                            nsHTMLReflowMetrics&     aDesiredSize,
         196                 :                            const nsHTMLReflowState& aReflowState,
         197                 :                            nsReflowStatus&          aStatus)
         198                 : {
         199               0 :   nsresult rv = NS_OK;
         200               0 :   nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
         201                 :   nsReflowStatus childStatus;
         202                 :
         203               0 :   aDesiredSize.width = aDesiredSize.height = 0;
         204               0 :   aDesiredSize.ascent = 0;
         205                 :
         206               0 :   nsBoundingMetrics bmSqr, bmBase, bmIndex;
         207               0 :   nsRenderingContext& renderingContext = *aReflowState.rendContext;
         208                 :
         209                 :   //////////////////
         210                 :   // Reflow Children
         211                 :
         212               0 :   PRInt32 count = 0;
         213               0 :   nsIFrame* baseFrame = nsnull;
         214               0 :   nsIFrame* indexFrame = nsnull;
         215               0 :   nsHTMLReflowMetrics baseSize;
         216               0 :   nsHTMLReflowMetrics indexSize;
         217               0 :   nsIFrame* childFrame = mFrames.FirstChild();
         218               0 :   while (childFrame) {
         219                 :     // ask our children to compute their bounding metrics
         220                 :     nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
         221               0 :                                          | NS_REFLOW_CALC_BOUNDING_METRICS);
         222                 :     nsHTMLReflowState childReflowState(aPresContext, aReflowState,
         223               0 :                                        childFrame, availSize);
         224                 :     rv = ReflowChild(childFrame, aPresContext,
         225               0 :                      childDesiredSize, childReflowState, childStatus);
         226                 :     //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
         227               0 :     if (NS_FAILED(rv)) {
         228                 :       // Call DidReflow() for the child frames we successfully did reflow.
         229               0 :       DidReflowChildren(mFrames.FirstChild(), childFrame);
         230               0 :       return rv;
         231                 :     }
         232               0 :     if (0 == count) {
         233                 :       // base
         234               0 :       baseFrame = childFrame;
         235               0 :       baseSize = childDesiredSize;
         236               0 :       bmBase = childDesiredSize.mBoundingMetrics;
         237                 :     }
         238               0 :     else if (1 == count) {
         239                 :       // index
         240               0 :       indexFrame = childFrame;
         241               0 :       indexSize = childDesiredSize;
         242               0 :       bmIndex = childDesiredSize.mBoundingMetrics;
         243                 :     }
         244               0 :     count++;
         245               0 :     childFrame = childFrame->GetNextSibling();
         246                 :   }
         247               0 :   if (2 != count) {
         248                 :     // report an error, encourage people to get their markups in order
         249               0 :     rv = ReflowError(renderingContext, aDesiredSize);
         250               0 :     aStatus = NS_FRAME_COMPLETE;
         251               0 :     NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
         252                 :     // Call DidReflow() for the child frames we successfully did reflow.
         253               0 :     DidReflowChildren(mFrames.FirstChild(), childFrame);
         254               0 :     return rv;
         255                 :   }
         256                 :
         257                 :   ////////////
         258                 :   // Prepare the radical symbol and the overline bar
         259                 :
         260               0 :   nsRefPtr<nsFontMetrics> fm;
         261               0 :   nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
         262               0 :   renderingContext.SetFont(fm);
         263                 :
         264                 :   // For radical glyphs from TeX fonts and some of the radical glyphs from
         265                 :   // Mathematica fonts, the thickness of the overline can be obtained from the
         266                 :   // ascent of the glyph.  Most fonts however have radical glyphs above the
         267                 :   // baseline so no assumption can be made about the meaning of the ascent.
         268                 :   nscoord ruleThickness, leading, em;
         269               0 :   GetRuleThickness(renderingContext, fm, ruleThickness);
         270                 :
         271               0 :   PRUnichar one = '1';
         272               0 :   nsBoundingMetrics bmOne = renderingContext.GetBoundingMetrics(&one, 1);
         273                 :
         274                 :   // get the leading to be left at the top of the resulting frame
         275                 :   // this seems more reliable than using fm->GetLeading() on suspicious fonts
         276               0 :   GetEmHeight(fm, em);
         277               0 :   leading = nscoord(0.2f * em);
         278                 :
         279                 :   // Rule 11, App. G, TeXbook
         280                 :   // psi = clearance between rule and content
         281               0 :   nscoord phi = 0, psi = 0;
         282               0 :   if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
         283               0 :     phi = fm->XHeight();
         284                 :   else
         285               0 :     phi = ruleThickness;
         286               0 :   psi = ruleThickness + phi/4;
         287                 :
         288                 :   // built-in: adjust clearance psi to emulate \mathstrut using '1' (TexBook, p.131)
         289               0 :   if (bmOne.ascent > bmBase.ascent)
         290               0 :     psi += bmOne.ascent - bmBase.ascent;
         291                 :
         292                 :   // make sure that the rule appears on on screen
         293               0 :   nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
         294               0 :   if (ruleThickness < onePixel) {
         295               0 :     ruleThickness = onePixel;
         296                 :   }
         297                 :
         298                 :   // adjust clearance psi to get an exact number of pixels -- this
         299                 :   // gives a nicer & uniform look on stacked radicals (bug 130282)
         300               0 :   nscoord delta = psi % onePixel;
         301               0 :   if (delta)
         302               0 :     psi += onePixel - delta; // round up
         303                 :
         304                 :   // Stretch the radical symbol to the appropriate height if it is not big enough.
         305               0 :   nsBoundingMetrics contSize = bmBase;
         306               0 :   contSize.descent = bmBase.ascent + bmBase.descent + psi;
         307               0 :   contSize.ascent = ruleThickness;
         308                 :
         309                 :   // height(radical) should be >= height(base) + psi + ruleThickness
         310               0 :   nsBoundingMetrics radicalSize;
         311                 :   mSqrChar.Stretch(aPresContext, renderingContext,
         312                 :                    NS_STRETCH_DIRECTION_VERTICAL,
         313                 :                    contSize, radicalSize,
         314                 :                    NS_STRETCH_LARGER,
         315               0 :                    NS_MATHML_IS_RTL(mPresentationData.flags));
         316                 :   // radicalSize have changed at this point, and should match with
         317                 :   // the bounding metrics of the char
         318               0 :   mSqrChar.GetBoundingMetrics(bmSqr);
         319                 :
         320                 :   // Update the desired size for the container (like msqrt, index is not yet included)
         321                 :   // the baseline will be that of the base.
         322               0 :   mBoundingMetrics.ascent = bmBase.ascent + psi + ruleThickness;
         323                 :   mBoundingMetrics.descent =
         324                 :     NS_MAX(bmBase.descent,
         325               0 :            (bmSqr.ascent + bmSqr.descent - mBoundingMetrics.ascent));
         326               0 :   mBoundingMetrics.width = bmSqr.width + bmBase.width;
         327               0 :   mBoundingMetrics.leftBearing = bmSqr.leftBearing;
         328                 :   mBoundingMetrics.rightBearing = bmSqr.width +
         329               0 :     NS_MAX(bmBase.width, bmBase.rightBearing); // take also care of the rule
         330                 :
         331               0 :   aDesiredSize.ascent = mBoundingMetrics.ascent + leading;
         332                 :   aDesiredSize.height = aDesiredSize.ascent +
         333                 :     NS_MAX(baseSize.height - baseSize.ascent,
         334               0 :            mBoundingMetrics.descent + ruleThickness);
         335               0 :   aDesiredSize.width = mBoundingMetrics.width;
         336                 :
         337                 :   /////////////
         338                 :   // Re-adjust the desired size to include the index.
         339                 :
         340                 :   // the index is raised by some fraction of the height
         341                 :   // of the radical, see \mroot macro in App. B, TexBook
         342               0 :   nscoord raiseIndexDelta = NSToCoordRound(0.6f * (bmSqr.ascent + bmSqr.descent));
         343                 :   nscoord indexRaisedAscent = mBoundingMetrics.ascent // top of radical
         344                 :     - (bmSqr.ascent + bmSqr.descent) // to bottom of radical
         345               0 :     + raiseIndexDelta + bmIndex.ascent + bmIndex.descent; // to top of raised index
         346                 :
         347               0 :   nscoord indexClearance = 0;
         348               0 :   if (mBoundingMetrics.ascent < indexRaisedAscent) {
         349                 :     indexClearance =
         350               0 :       indexRaisedAscent - mBoundingMetrics.ascent; // excess gap introduced by a tall index
         351               0 :     mBoundingMetrics.ascent = indexRaisedAscent;
         352               0 :     nscoord descent = aDesiredSize.height - aDesiredSize.ascent;
         353               0 :     aDesiredSize.ascent = mBoundingMetrics.ascent + leading;
         354               0 :     aDesiredSize.height = aDesiredSize.ascent + descent;
         355                 :   }
         356                 :
         357                 :   nscoord dxIndex, dxSqr;
         358               0 :   GetRadicalXOffsets(bmIndex.width, bmSqr.width, fm, &dxIndex, &dxSqr);
         359                 :
         360               0 :   mBoundingMetrics.width = dxSqr + bmSqr.width + bmBase.width;
         361                 :   mBoundingMetrics.leftBearing =
         362               0 :     NS_MIN(dxIndex + bmIndex.leftBearing, dxSqr + bmSqr.leftBearing);
         363                 :   mBoundingMetrics.rightBearing = dxSqr + bmSqr.width +
         364               0 :     NS_MAX(bmBase.width, bmBase.rightBearing);
         365                 :
         366               0 :   aDesiredSize.width = mBoundingMetrics.width;
         367               0 :   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
         368               0 :   GatherAndStoreOverflow(&aDesiredSize);
         369                 :
         370                 :   // place the index
         371               0 :   nscoord dx = dxIndex;
         372               0 :   nscoord dy = aDesiredSize.ascent - (indexRaisedAscent + indexSize.ascent - bmIndex.ascent);
         373                 :   FinishReflowChild(indexFrame, aPresContext, nsnull, indexSize,
         374                 :                     MirrorIfRTL(aDesiredSize.width, indexSize.width, dx),
         375               0 :                     dy, 0);
         376                 :
         377                 :   // place the radical symbol and the radical bar
         378               0 :   dx = dxSqr;
         379               0 :   dy = indexClearance + leading; // leave a leading at the top
         380                 :   mSqrChar.SetRect(nsRect(MirrorIfRTL(aDesiredSize.width, bmSqr.width, dx),
         381               0 :                           dy, bmSqr.width, bmSqr.ascent + bmSqr.descent));
         382               0 :   dx += bmSqr.width;
         383                 :   mBarRect.SetRect(MirrorIfRTL(aDesiredSize.width, bmBase.width, dx),
         384               0 :                    dy, bmBase.width, ruleThickness);
         385                 :
         386                 :   // place the base
         387               0 :   dy = aDesiredSize.ascent - baseSize.ascent;
         388                 :   FinishReflowChild(baseFrame, aPresContext, nsnull, baseSize,
         389                 :                     MirrorIfRTL(aDesiredSize.width, baseSize.width, dx),
         390               0 :                     dy, 0);
         391                 :
         392               0 :   mReference.x = 0;
         393               0 :   mReference.y = aDesiredSize.ascent;
         394                 :
         395               0 :   aStatus = NS_FRAME_COMPLETE;
         396               0 :   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
         397               0 :   return NS_OK;
         398                 : }
         399                 :
         400                 : /* virtual */ nscoord
         401               0 : nsMathMLmrootFrame::GetIntrinsicWidth(nsRenderingContext* aRenderingContext)
         402                 : {
         403               0 :   nsIFrame* baseFrame = mFrames.FirstChild();
         404               0 :   nsIFrame* indexFrame = nsnull;
         405               0 :   if (baseFrame)
         406               0 :     indexFrame = baseFrame->GetNextSibling();
         407               0 :   if (!indexFrame || indexFrame->GetNextSibling()) {
         408               0 :     nsHTMLReflowMetrics desiredSize;
         409               0 :     ReflowError(*aRenderingContext, desiredSize);
         410               0 :     return desiredSize.width;
         411                 :   }
         412                 :
         413                 :   nscoord baseWidth =
         414                 :     nsLayoutUtils::IntrinsicForContainer(aRenderingContext, baseFrame,
         415               0 :                                          nsLayoutUtils::PREF_WIDTH);
         416                 :   nscoord indexWidth =
         417                 :     nsLayoutUtils::IntrinsicForContainer(aRenderingContext, indexFrame,
         418               0 :                                          nsLayoutUtils::PREF_WIDTH);
         419               0 :   nscoord sqrWidth = mSqrChar.GetMaxWidth(PresContext(), *aRenderingContext);
         420                 :
         421                 :   nscoord dxSqr;
         422                 :   GetRadicalXOffsets(indexWidth, sqrWidth, aRenderingContext->FontMetrics(),
         423               0 :                      nsnull, &dxSqr);
         424                 :
         425               0 :   return dxSqr + sqrWidth + baseWidth;
         426                 : }
         427                 :
         428                 : // ----------------------
         429                 : // the Style System will use these to pass the proper style context to our MathMLChar
         430                 : nsStyleContext*
         431               0 : nsMathMLmrootFrame::GetAdditionalStyleContext(PRInt32 aIndex) const
         432                 : {
         433               0 :   switch (aIndex) {
         434                 :   case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
         435               0 :     return mSqrChar.GetStyleContext();
         436                 :     break;
         437                 :   default:
         438               0 :     return nsnull;
         439                 :   }
         440                 : }
         441                 :
         442                 : void
         443               0 : nsMathMLmrootFrame::SetAdditionalStyleContext(PRInt32          aIndex,
         444                 :                                               nsStyleContext*  aStyleContext)
         445                 : {
         446               0 :   switch (aIndex) {
         447                 :   case NS_SQR_CHAR_STYLE_CONTEXT_INDEX:
         448               0 :     mSqrChar.SetStyleContext(aStyleContext);
         449               0 :     break;
         450                 :   }
         451               0 : }

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