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: 2012-06-02 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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