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

LCOV - code coverage report
| Current view: | directory - layout/mathml - nsMathMLmmultiscriptsFrame.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 187 | 0 | 0.0 %
| Date: | 2012-04-21 | Functions: | 8 | 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                 :  *   Shyjan Mahamud <mahamud@cs.cmu.edu> (added TeX rendering rules)
          26                 :  *
          27                 :  * Alternatively, the contents of this file may be used under the terms of
          28                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
          29                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          31                 :  * of those above. If you wish to allow use of your version of this file only
          32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          33                 :  * use your version of this file under the terms of the MPL, indicate your
          34                 :  * decision by deleting the provisions above and replace them with the notice
          35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          36                 :  * the provisions above, a recipient may use your version of this file under
          37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          38                 :  *
          39                 :  * ***** END LICENSE BLOCK ***** */
          40                 :
          41                 :
          42                 : #include "nsCOMPtr.h"
          43                 : #include "nsFrame.h"
          44                 : #include "nsPresContext.h"
          45                 : #include "nsStyleContext.h"
          46                 : #include "nsStyleConsts.h"
          47                 : #include "nsRenderingContext.h"
          48                 :
          49                 : #include "nsMathMLmmultiscriptsFrame.h"
          50                 :
          51                 : //
          52                 : // <mmultiscripts> -- attach prescripts and tensor indices to a base - implementation
          53                 : //
          54                 :
          55                 : nsIFrame*
          56               0 : NS_NewMathMLmmultiscriptsFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
          57                 : {
          58               0 :   return new (aPresShell) nsMathMLmmultiscriptsFrame(aContext);
          59                 : }
          60                 :
          61               0 : NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmmultiscriptsFrame)
          62                 :
          63               0 : nsMathMLmmultiscriptsFrame::~nsMathMLmmultiscriptsFrame()
          64                 : {
          65               0 : }
          66                 :
          67                 : NS_IMETHODIMP
          68               0 : nsMathMLmmultiscriptsFrame::TransmitAutomaticData()
          69                 : {
          70                 :   // if our base is an embellished operator, let its state bubble to us
          71               0 :   mPresentationData.baseFrame = mFrames.FirstChild();
          72               0 :   GetEmbellishDataFrom(mPresentationData.baseFrame, mEmbellishData);
          73                 :
          74                 :   // The REC says:
          75                 :   // The <mmultiscripts> element increments scriptlevel by 1, and sets
          76                 :   // displaystyle to "false", within each of its arguments except base
          77                 :   UpdatePresentationDataFromChildAt(1, -1,
          78               0 :     ~NS_MATHML_DISPLAYSTYLE, NS_MATHML_DISPLAYSTYLE);
          79                 :
          80                 :   // The TeXbook (Ch 17. p.141) says the superscript inherits the compression
          81                 :   // while the subscript is compressed. So here we collect subscripts and set
          82                 :   // the compression flag in them.
          83               0 :   PRInt32 count = 0;
          84               0 :   bool isSubScript = false;
          85               0 :   nsAutoTArray<nsIFrame*, 8> subScriptFrames;
          86               0 :   nsIFrame* childFrame = mFrames.FirstChild();
          87               0 :   while (childFrame) {
          88               0 :     if (childFrame->GetContent()->Tag() == nsGkAtoms::mprescripts_) {
          89                 :       // mprescripts frame
          90                 :     }
          91               0 :     else if (0 == count) {
          92                 :       // base frame
          93                 :     }
          94                 :     else {
          95                 :       // super/subscript block
          96               0 :       if (isSubScript) {
          97                 :         // subscript
          98               0 :         subScriptFrames.AppendElement(childFrame);
          99                 :       }
         100                 :       else {
         101                 :         // superscript
         102                 :       }
         103               0 :       isSubScript = !isSubScript;
         104                 :     }
         105               0 :     count++;
         106               0 :     childFrame = childFrame->GetNextSibling();
         107                 :   }
         108               0 :   for (PRInt32 i = subScriptFrames.Length() - 1; i >= 0; i--) {
         109               0 :     childFrame = subScriptFrames[i];
         110                 :     PropagatePresentationDataFor(childFrame,
         111               0 :       NS_MATHML_COMPRESSED, NS_MATHML_COMPRESSED);
         112                 :   }
         113                 :
         114               0 :   return NS_OK;
         115                 : }
         116                 :
         117                 : void
         118               0 : nsMathMLmmultiscriptsFrame::ProcessAttributes()
         119                 : {
         120               0 :   mSubScriptShift = 0;
         121               0 :   mSupScriptShift = 0;
         122                 :
         123                 :   // check if the subscriptshift attribute is there
         124               0 :   nsAutoString value;
         125                 :   GetAttribute(mContent, mPresentationData.mstyle,
         126               0 :                nsGkAtoms::subscriptshift_, value);
         127               0 :   if (!value.IsEmpty()) {
         128               0 :     nsCSSValue cssValue;
         129               0 :     if (ParseNumericValue(value, cssValue) && cssValue.IsLengthUnit()) {
         130               0 :       mSubScriptShift = CalcLength(PresContext(), mStyleContext, cssValue);
         131                 :     }
         132                 :   }
         133                 :   // check if the superscriptshift attribute is there
         134                 :   GetAttribute(mContent, mPresentationData.mstyle,
         135               0 :                nsGkAtoms::superscriptshift_, value);
         136               0 :   if (!value.IsEmpty()) {
         137               0 :     nsCSSValue cssValue;
         138               0 :     if (ParseNumericValue(value, cssValue) && cssValue.IsLengthUnit()) {
         139               0 :       mSupScriptShift = CalcLength(PresContext(), mStyleContext, cssValue);
         140                 :     }
         141                 :   }
         142               0 : }
         143                 :
         144                 : /* virtual */ nsresult
         145               0 : nsMathMLmmultiscriptsFrame::Place(nsRenderingContext& aRenderingContext,
         146                 :                                   bool                 aPlaceOrigin,
         147                 :                                   nsHTMLReflowMetrics& aDesiredSize)
         148                 : {
         149                 :   ////////////////////////////////////
         150                 :   // Get the children's desired sizes
         151                 :
         152                 :   nscoord minShiftFromXHeight, subDrop, supDrop;
         153                 :
         154                 :   ////////////////////////////////////////
         155                 :   // Initialize super/sub shifts that
         156                 :   // depend only on the current font
         157                 :   ////////////////////////////////////////
         158                 :
         159               0 :   ProcessAttributes();
         160                 :
         161                 :   // get x-height (an ex)
         162               0 :   const nsStyleFont* font = GetStyleFont();
         163               0 :   nsRefPtr<nsFontMetrics> fm;
         164               0 :   nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
         165               0 :   aRenderingContext.SetFont(fm);
         166                 :
         167               0 :   nscoord xHeight = fm->XHeight();
         168                 :
         169                 :   nscoord ruleSize;
         170               0 :   GetRuleThickness (aRenderingContext, fm, ruleSize);
         171                 :
         172                 :   // scriptspace from TeX for extra spacing after sup/subscript (0.5pt in plain TeX)
         173                 :   // forced to be at least 1 pixel here
         174               0 :   nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
         175               0 :   nscoord scriptSpace = NS_MAX(nsPresContext::CSSPointsToAppUnits(0.5f), onePixel);
         176                 :
         177                 :   /////////////////////////////////////
         178                 :   // first the shift for the subscript
         179                 :
         180                 :   // subScriptShift{1,2}
         181                 :   // = minimum amount to shift the subscript down
         182                 :   // = sub{1,2} in TeXbook
         183                 :   // subScriptShift1 = subscriptshift attribute * x-height
         184                 :   nscoord subScriptShift1, subScriptShift2;
         185                 :
         186                 :   // Get subScriptShift{1,2} default from font
         187               0 :   GetSubScriptShifts (fm, subScriptShift1, subScriptShift2);
         188               0 :   if (0 < mSubScriptShift) {
         189                 :     // the user has set the subscriptshift attribute
         190               0 :     float scaler = ((float) subScriptShift2) / subScriptShift1;
         191               0 :     subScriptShift1 = NS_MAX(subScriptShift1, mSubScriptShift);
         192               0 :     subScriptShift2 = NSToCoordRound(scaler * subScriptShift1);
         193                 :   }
         194                 :   // the font dependent shift
         195               0 :   nscoord subScriptShift = NS_MAX(subScriptShift1,subScriptShift2);
         196                 :
         197                 :   /////////////////////////////////////
         198                 :   // next the shift for the superscript
         199                 :
         200                 :   // supScriptShift{1,2,3}
         201                 :   // = minimum amount to shift the supscript up
         202                 :   // = sup{1,2,3} in TeX
         203                 :   // supScriptShift1 = superscriptshift attribute * x-height
         204                 :   // Note that there are THREE values for supscript shifts depending
         205                 :   // on the current style
         206                 :   nscoord supScriptShift1, supScriptShift2, supScriptShift3;
         207                 :   // Set supScriptShift{1,2,3} default from font
         208               0 :   GetSupScriptShifts (fm, supScriptShift1, supScriptShift2, supScriptShift3);
         209               0 :   if (0 < mSupScriptShift) {
         210                 :     // the user has set the superscriptshift attribute
         211               0 :     float scaler2 = ((float) supScriptShift2) / supScriptShift1;
         212               0 :     float scaler3 = ((float) supScriptShift3) / supScriptShift1;
         213               0 :     supScriptShift1 = NS_MAX(supScriptShift1, mSupScriptShift);
         214               0 :     supScriptShift2 = NSToCoordRound(scaler2 * supScriptShift1);
         215               0 :     supScriptShift3 = NSToCoordRound(scaler3 * supScriptShift1);
         216                 :   }
         217                 :
         218                 :   // get sup script shift depending on current script level and display style
         219                 :   // Rule 18c, App. G, TeXbook
         220                 :   nscoord supScriptShift;
         221               0 :   if ( font->mScriptLevel == 0 &&
         222                 :        NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags) &&
         223               0 :       !NS_MATHML_IS_COMPRESSED(mPresentationData.flags)) {
         224                 :     // Style D in TeXbook
         225               0 :     supScriptShift = supScriptShift1;
         226                 :   }
         227               0 :   else if (NS_MATHML_IS_COMPRESSED(mPresentationData.flags)) {
         228                 :     // Style C' in TeXbook = D',T',S',SS'
         229               0 :     supScriptShift = supScriptShift3;
         230                 :   }
         231                 :   else {
         232                 :     // everything else = T,S,SS
         233               0 :     supScriptShift = supScriptShift2;
         234                 :   }
         235                 :
         236                 :   ////////////////////////////////////
         237                 :   // Get the children's sizes
         238                 :   ////////////////////////////////////
         239                 :
         240               0 :   nscoord width = 0, prescriptsWidth = 0, rightBearing = 0;
         241               0 :   nsIFrame* mprescriptsFrame = nsnull; // frame of <mprescripts/>, if there.
         242               0 :   bool isSubScript = false;
         243               0 :   nscoord minSubScriptShift = 0, minSupScriptShift = 0;
         244               0 :   nscoord trySubScriptShift = subScriptShift;
         245               0 :   nscoord trySupScriptShift = supScriptShift;
         246               0 :   nscoord maxSubScriptShift = subScriptShift;
         247               0 :   nscoord maxSupScriptShift = supScriptShift;
         248               0 :   PRInt32 count = 0;
         249               0 :   nsHTMLReflowMetrics baseSize;
         250               0 :   nsHTMLReflowMetrics subScriptSize;
         251               0 :   nsHTMLReflowMetrics supScriptSize;
         252               0 :   nsIFrame* baseFrame = nsnull;
         253               0 :   nsIFrame* subScriptFrame = nsnull;
         254               0 :   nsIFrame* supScriptFrame = nsnull;
         255                 :
         256               0 :   bool firstPrescriptsPair = false;
         257               0 :   nsBoundingMetrics bmBase, bmSubScript, bmSupScript;
         258               0 :   nscoord italicCorrection = 0;
         259                 :
         260               0 :   mBoundingMetrics.width = 0;
         261               0 :   mBoundingMetrics.ascent = mBoundingMetrics.descent = -0x7FFFFFFF;
         262               0 :   nscoord ascent = -0x7FFFFFFF, descent = -0x7FFFFFFF;
         263               0 :   aDesiredSize.width = aDesiredSize.height = 0;
         264                 :
         265               0 :   nsIFrame* childFrame = mFrames.FirstChild();
         266               0 :   while (childFrame) {
         267               0 :     if (childFrame->GetContent()->Tag() == nsGkAtoms::mprescripts_) {
         268               0 :       if (mprescriptsFrame) {
         269                 :         // duplicate <mprescripts/> found
         270                 :         // report an error, encourage people to get their markups in order
         271               0 :         return ReflowError(aRenderingContext, aDesiredSize);
         272                 :       }
         273               0 :       mprescriptsFrame = childFrame;
         274               0 :       firstPrescriptsPair = true;
         275                 :     }
         276                 :     else {
         277               0 :       if (0 == count) {
         278                 :         // base
         279               0 :         baseFrame = childFrame;
         280               0 :         GetReflowAndBoundingMetricsFor(baseFrame, baseSize, bmBase);
         281               0 :         GetItalicCorrection(bmBase, italicCorrection);
         282                 :         // for the superscript, we always add "a little to spare"
         283               0 :         italicCorrection += onePixel;
         284                 :
         285                 :         // we update mBoundingMetrics.{ascent,descent} with that
         286                 :         // of the baseFrame only after processing all the sup/sub pairs
         287                 :         // XXX need italic correction only *if* there are postscripts ?
         288               0 :         mBoundingMetrics.width = bmBase.width + italicCorrection;
         289               0 :         mBoundingMetrics.rightBearing = bmBase.rightBearing;
         290               0 :         mBoundingMetrics.leftBearing = bmBase.leftBearing; // until overwritten
         291                 :       }
         292                 :       else {
         293                 :         // super/subscript block
         294               0 :         if (isSubScript) {
         295                 :           // subscript
         296               0 :           subScriptFrame = childFrame;
         297               0 :           GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript);
         298                 :           // get the subdrop from the subscript font
         299               0 :           GetSubDropFromChild (subScriptFrame, subDrop);
         300                 :           // parameter v, Rule 18a, App. G, TeXbook
         301               0 :           minSubScriptShift = bmBase.descent + subDrop;
         302               0 :           trySubScriptShift = NS_MAX(minSubScriptShift,subScriptShift);
         303                 :           mBoundingMetrics.descent =
         304               0 :             NS_MAX(mBoundingMetrics.descent,bmSubScript.descent);
         305               0 :           descent = NS_MAX(descent,subScriptSize.height - subScriptSize.ascent);
         306               0 :           width = bmSubScript.width + scriptSpace;
         307               0 :           rightBearing = bmSubScript.rightBearing;
         308                 :         }
         309                 :         else {
         310                 :           // supscript
         311               0 :           supScriptFrame = childFrame;
         312               0 :           GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript);
         313                 :           // get the supdrop from the supscript font
         314               0 :           GetSupDropFromChild (supScriptFrame, supDrop);
         315                 :           // parameter u, Rule 18a, App. G, TeXbook
         316               0 :           minSupScriptShift = bmBase.ascent - supDrop;
         317                 :           // get min supscript shift limit from x-height
         318                 :           // = d(x) + 1/4 * sigma_5, Rule 18c, App. G, TeXbook
         319                 :           minShiftFromXHeight = NSToCoordRound
         320               0 :             ((bmSupScript.descent + (1.0f/4.0f) * xHeight));
         321                 :           trySupScriptShift =
         322               0 :             NS_MAX(minSupScriptShift,NS_MAX(minShiftFromXHeight,supScriptShift));
         323                 :           mBoundingMetrics.ascent =
         324               0 :             NS_MAX(mBoundingMetrics.ascent,bmSupScript.ascent);
         325               0 :           ascent = NS_MAX(ascent,supScriptSize.ascent);
         326               0 :           width = NS_MAX(width, bmSupScript.width + scriptSpace);
         327               0 :           rightBearing = NS_MAX(rightBearing, bmSupScript.rightBearing);
         328                 :
         329               0 :           if (!mprescriptsFrame) { // we are still looping over base & postscripts
         330               0 :             mBoundingMetrics.rightBearing = mBoundingMetrics.width + rightBearing;
         331               0 :             mBoundingMetrics.width += width;
         332                 :           }
         333                 :           else {
         334               0 :             prescriptsWidth += width;
         335               0 :             if (firstPrescriptsPair) {
         336               0 :               firstPrescriptsPair = false;
         337                 :               mBoundingMetrics.leftBearing =
         338               0 :                 NS_MIN(bmSubScript.leftBearing, bmSupScript.leftBearing);
         339                 :             }
         340                 :           }
         341               0 :           width = rightBearing = 0;
         342                 :
         343                 :           // negotiate between the various shifts so that
         344                 :           // there is enough gap between the sup and subscripts
         345                 :           // Rule 18e, App. G, TeXbook
         346                 :           nscoord gap =
         347                 :             (trySupScriptShift - bmSupScript.descent) -
         348               0 :             (bmSubScript.ascent - trySubScriptShift);
         349               0 :           if (gap < 4.0f * ruleSize) {
         350                 :             // adjust trySubScriptShift to get a gap of (4.0 * ruleSize)
         351               0 :             trySubScriptShift += NSToCoordRound ((4.0f * ruleSize) - gap);
         352                 :           }
         353                 :
         354                 :           // next we want to ensure that the bottom of the superscript
         355                 :           // will be > (4/5) * x-height above baseline
         356                 :           gap = NSToCoordRound ((4.0f/5.0f) * xHeight -
         357               0 :                   (trySupScriptShift - bmSupScript.descent));
         358               0 :           if (gap > 0.0f) {
         359               0 :             trySupScriptShift += gap;
         360               0 :             trySubScriptShift -= gap;
         361                 :           }
         362                 :
         363               0 :           maxSubScriptShift = NS_MAX(maxSubScriptShift, trySubScriptShift);
         364               0 :           maxSupScriptShift = NS_MAX(maxSupScriptShift, trySupScriptShift);
         365                 :
         366               0 :           trySubScriptShift = subScriptShift;
         367               0 :           trySupScriptShift = supScriptShift;
         368                 :         }
         369                 :       }
         370                 :
         371               0 :       isSubScript = !isSubScript;
         372                 :     }
         373               0 :     count++;
         374               0 :     childFrame = childFrame->GetNextSibling();
         375                 :   }
         376                 :   // note: width=0 if all sup-sub pairs match correctly
         377               0 :   if ((0 != width) || !baseFrame || !subScriptFrame || !supScriptFrame) {
         378                 :     // report an error, encourage people to get their markups in order
         379               0 :     return ReflowError(aRenderingContext, aDesiredSize);
         380                 :   }
         381                 :
         382                 :   // we left out the width of prescripts, so ...
         383               0 :   mBoundingMetrics.rightBearing += prescriptsWidth;
         384               0 :   mBoundingMetrics.width += prescriptsWidth;
         385                 :
         386                 :   // we left out the base during our bounding box updates, so ...
         387                 :   mBoundingMetrics.ascent =
         388               0 :     NS_MAX(mBoundingMetrics.ascent+maxSupScriptShift,bmBase.ascent);
         389                 :   mBoundingMetrics.descent =
         390               0 :     NS_MAX(mBoundingMetrics.descent+maxSubScriptShift,bmBase.descent);
         391                 :
         392                 :   // get the reflow metrics ...
         393                 :   aDesiredSize.ascent =
         394               0 :     NS_MAX(ascent+maxSupScriptShift,baseSize.ascent);
         395                 :   aDesiredSize.height = aDesiredSize.ascent +
         396               0 :     NS_MAX(descent+maxSubScriptShift,baseSize.height - baseSize.ascent);
         397               0 :   aDesiredSize.width = mBoundingMetrics.width;
         398               0 :   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
         399                 :
         400               0 :   mReference.x = 0;
         401               0 :   mReference.y = aDesiredSize.ascent;
         402                 :
         403                 :   //////////////////
         404                 :   // Place Children
         405                 :
         406                 :   // Place prescripts, followed by base, and then postscripts.
         407                 :   // The list of frames is in the order: {base} {postscripts} {prescripts}
         408                 :   // We go over the list in a circular manner, starting at <prescripts/>
         409                 :
         410               0 :   if (aPlaceOrigin) {
         411               0 :     nscoord dx = 0, dy = 0;
         412                 :
         413               0 :     count = 0;
         414               0 :     childFrame = mprescriptsFrame;
         415               0 :     do {
         416               0 :       if (!childFrame) { // end of prescripts,
         417                 :         // place the base ...
         418               0 :         childFrame = baseFrame;
         419               0 :         dy = aDesiredSize.ascent - baseSize.ascent;
         420                 :         FinishReflowChild (baseFrame, PresContext(), nsnull, baseSize,
         421                 :                            MirrorIfRTL(aDesiredSize.width,
         422                 :                                        baseSize.width,
         423                 :                                        dx),
         424               0 :                            dy, 0);
         425               0 :         dx += bmBase.width + italicCorrection;
         426                 :       }
         427               0 :       else if (mprescriptsFrame != childFrame) {
         428                 :         // process each sup/sub pair
         429               0 :         if (0 == count) {
         430               0 :           subScriptFrame = childFrame;
         431               0 :           count = 1;
         432                 :         }
         433               0 :         else if (1 == count) {
         434               0 :           supScriptFrame = childFrame;
         435               0 :           count = 0;
         436                 :
         437                 :           // get the ascent/descent of sup/subscripts stored in their rects
         438                 :           // rect.x = descent, rect.y = ascent
         439               0 :           GetReflowAndBoundingMetricsFor(subScriptFrame, subScriptSize, bmSubScript);
         440               0 :           GetReflowAndBoundingMetricsFor(supScriptFrame, supScriptSize, bmSupScript);
         441                 :
         442                 :           // center w.r.t. largest width
         443               0 :           width = NS_MAX(subScriptSize.width, supScriptSize.width);
         444                 :
         445                 :           dy = aDesiredSize.ascent - subScriptSize.ascent +
         446               0 :             maxSubScriptShift;
         447                 :           FinishReflowChild (subScriptFrame, PresContext(), nsnull,
         448                 :                              subScriptSize,
         449                 :                              MirrorIfRTL(aDesiredSize.width,
         450                 :                                          subScriptSize.width,
         451                 :                                          dx + (width-subScriptSize.width)/2),
         452               0 :                              dy, 0);
         453                 :
         454                 :           dy = aDesiredSize.ascent - supScriptSize.ascent -
         455               0 :             maxSupScriptShift;
         456                 :           FinishReflowChild (supScriptFrame, PresContext(), nsnull,
         457                 :                              supScriptSize,
         458                 :                              MirrorIfRTL(aDesiredSize.width,
         459                 :                                          supScriptSize.width,
         460                 :                                          dx + (width-supScriptSize.width)/2),
         461               0 :                              dy, 0);
         462                 :
         463               0 :           dx += width + scriptSpace;
         464                 :         }
         465                 :       }
         466               0 :       childFrame = childFrame->GetNextSibling();
         467                 :     } while (mprescriptsFrame != childFrame);
         468                 :   }
         469                 :
         470               0 :   return NS_OK;
         471                 : }

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