LCOV - code coverage report
Current view: directory - objdir/dist/include - nsBidiPresUtils.h (source / functions) Found Hit Coverage
Test: app.info Lines: 2 0 0.0 %
Date: 2012-06-02 Functions: 3 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is mozilla.org code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * IBM Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 2000
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *   IBM Corporation
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : #ifdef IBMBIDI
      41                 : 
      42                 : #ifndef nsBidiPresUtils_h___
      43                 : #define nsBidiPresUtils_h___
      44                 : 
      45                 : #include "nsTArray.h"
      46                 : #include "nsIFrame.h"
      47                 : #include "nsBidi.h"
      48                 : #include "nsBidiUtils.h"
      49                 : #include "nsCOMPtr.h"
      50                 : #include "nsDataHashtable.h"
      51                 : #include "nsBlockFrame.h"
      52                 : #include "nsTHashtable.h"
      53                 : 
      54                 : #ifdef DrawText
      55                 : #undef DrawText
      56                 : #endif
      57                 : 
      58                 : struct BidiParagraphData;
      59                 : struct BidiLineData;
      60                 : 
      61                 : /**
      62                 :  * A structure representing some continuation state for each frame on the line,
      63                 :  * used to determine the first and the last continuation frame for each
      64                 :  * continuation chain on the line.
      65                 :  */
      66                 : struct nsFrameContinuationState : public nsVoidPtrHashKey
      67                 : {
      68                 :   nsFrameContinuationState(const void *aFrame) : nsVoidPtrHashKey(aFrame) {}
      69                 : 
      70                 :   /**
      71                 :    * The first visual frame in the continuation chain containing this frame, or
      72                 :    * nsnull if this frame is the first visual frame in the chain.
      73                 :    */
      74                 :   nsIFrame* mFirstVisualFrame;
      75                 : 
      76                 :   /**
      77                 :    * The number of frames in the continuation chain containing this frame, if
      78                 :    * this frame is the first visual frame of the chain, or 0 otherwise.
      79                 :    */
      80                 :   PRUint32 mFrameCount;
      81                 : 
      82                 :   /**
      83                 :    * TRUE if this frame is the first visual frame of its continuation chain on
      84                 :    * this line and the chain has some frames on the previous lines.
      85                 :    */
      86                 :   bool mHasContOnPrevLines;
      87                 : 
      88                 :   /**
      89                 :    * TRUE if this frame is the first visual frame of its continuation chain on
      90                 :    * this line and the chain has some frames left for next lines.
      91                 :    */
      92                 :   bool mHasContOnNextLines;
      93                 : };
      94                 : 
      95                 : /*
      96                 :  * Following type is used to pass needed hashtable to reordering methods
      97                 :  */
      98                 : typedef nsTHashtable<nsFrameContinuationState> nsContinuationStates;
      99                 : 
     100                 : /**
     101                 :  * A structure representing a logical position which should be resolved
     102                 :  * into its visual position during BiDi processing.
     103                 :  */
     104                 : struct nsBidiPositionResolve
     105                 : {
     106                 :   // [in] Logical index within string.
     107                 :   PRInt32 logicalIndex;
     108                 :   // [out] Visual index within string.
     109                 :   // If the logical position was not found, set to kNotFound.
     110                 :   PRInt32 visualIndex;
     111                 :   // [out] Visual position of the character, from the left (on the X axis), in twips.
     112                 :   // Eessentially, this is the X position (relative to the rendering context) where the text was drawn + the font metric of the visual string to the left of the given logical position.
     113                 :   // If the logical position was not found, set to kNotFound.
     114                 :   PRInt32 visualLeftTwips;
     115                 :   // [out] Visual width of the character, in twips.
     116                 :   // If the logical position was not found, set to kNotFound.
     117                 :   PRInt32 visualWidth;
     118                 : };
     119                 : 
     120                 : class nsBidiPresUtils {
     121                 : public:
     122                 :   nsBidiPresUtils();
     123                 :   ~nsBidiPresUtils();
     124                 :   
     125                 :   /**
     126                 :    * Interface for the processor used by ProcessText. Used by process text to
     127                 :    * collect information about the width of subruns and to notify where each
     128                 :    * subrun should be rendered.
     129                 :    */
     130               0 :   class BidiProcessor {
     131                 :   public:
     132               0 :     virtual ~BidiProcessor() { }
     133                 : 
     134                 :     /**
     135                 :      * Sets the current text with the given length and the given direction.
     136                 :      *
     137                 :      * @remark The reason that the function gives a string instead of an index
     138                 :      *  is that ProcessText copies and modifies the string passed to it, so
     139                 :      *  passing an index would be impossible.
     140                 :      * 
     141                 :      * @param aText The string of text.
     142                 :      * @param aLength The length of the string of text.
     143                 :      * @param aDirection The direction of the text. The string will never have
     144                 :      *  mixed direction.
     145                 :      */
     146                 :     virtual void SetText(const PRUnichar*   aText,
     147                 :                          PRInt32            aLength,
     148                 :                          nsBidiDirection    aDirection) = 0;
     149                 : 
     150                 :     /**
     151                 :      * Returns the measured width of the text given in SetText. If SetText was
     152                 :      * not called with valid parameters, the result of this call is undefined.
     153                 :      * This call is guaranteed to only be called once between SetText calls.
     154                 :      * Will be invoked before DrawText.
     155                 :      */
     156                 :     virtual nscoord GetWidth() = 0;
     157                 : 
     158                 :     /**
     159                 :      * Draws the text given in SetText to a rendering context. If SetText was
     160                 :      * not called with valid parameters, the result of this call is undefined.
     161                 :      * This call is guaranteed to only be called once between SetText calls.
     162                 :      * 
     163                 :      * @param aXOffset The offset of the left side of the substring to be drawn
     164                 :      *  from the beginning of the overall string passed to ProcessText.
     165                 :      * @param aWidth The width returned by GetWidth.
     166                 :      */
     167                 :     virtual void DrawText(nscoord   aXOffset,
     168                 :                           nscoord   aWidth) = 0;
     169                 :   };
     170                 : 
     171                 :   /**
     172                 :    * Make Bidi engine calculate the embedding levels of the frames that are
     173                 :    * descendants of a given block frame.
     174                 :    *
     175                 :    * @param aBlockFrame          The block frame
     176                 :    *
     177                 :    *  @lina 06/18/2000
     178                 :    */
     179                 :   static nsresult Resolve(nsBlockFrame* aBlockFrame);
     180                 :   static nsresult ResolveParagraph(nsBlockFrame* aBlockFrame,
     181                 :                                    BidiParagraphData* aBpd);
     182                 :   static void ResolveParagraphWithinBlock(nsBlockFrame* aBlockFrame,
     183                 :                                           BidiParagraphData* aBpd);
     184                 : 
     185                 :   /**
     186                 :    * Reorder this line using Bidi engine.
     187                 :    * Update frame array, following the new visual sequence.
     188                 :    * 
     189                 :    * @lina 05/02/2000
     190                 :    */
     191                 :   static void ReorderFrames(nsIFrame*            aFirstFrameOnLine,
     192                 :                             PRInt32              aNumFramesOnLine);
     193                 : 
     194                 :   /**
     195                 :    * Format Unicode text, taking into account bidi capabilities
     196                 :    * of the platform. The formatting includes: reordering, Arabic shaping,
     197                 :    * symmetric and numeric swapping, removing control characters.
     198                 :    *
     199                 :    * @lina 06/18/2000 
     200                 :    */
     201                 :   static nsresult FormatUnicodeText(nsPresContext* aPresContext,
     202                 :                                     PRUnichar*      aText,
     203                 :                                     PRInt32&        aTextLength,
     204                 :                                     nsCharType      aCharType,
     205                 :                                     bool            aIsOddLevel);
     206                 : 
     207                 :   /**
     208                 :    * Reorder plain text using the Unicode Bidi algorithm and send it to
     209                 :    * a rendering context for rendering.
     210                 :    *
     211                 :    * @param[in] aText  the string to be rendered (in logical order)
     212                 :    * @param aLength the number of characters in the string
     213                 :    * @param aBaseDirection the base direction of the string
     214                 :    *  NSBIDI_LTR - left-to-right string
     215                 :    *  NSBIDI_RTL - right-to-left string
     216                 :    * @param aPresContext the presentation context
     217                 :    * @param aRenderingContext the rendering context to render to
     218                 :    * @param aTextRunConstructionContext the rendering context to be used to construct the textrun (affects font hinting)
     219                 :    * @param aX the x-coordinate to render the string
     220                 :    * @param aY the y-coordinate to render the string
     221                 :    * @param[in,out] aPosResolve array of logical positions to resolve into visual positions; can be nsnull if this functionality is not required
     222                 :    * @param aPosResolveCount number of items in the aPosResolve array
     223                 :    */
     224                 :   static nsresult RenderText(const PRUnichar*       aText,
     225                 :                              PRInt32                aLength,
     226                 :                              nsBidiDirection        aBaseDirection,
     227                 :                              nsPresContext*         aPresContext,
     228                 :                              nsRenderingContext&    aRenderingContext,
     229                 :                              nsRenderingContext&    aTextRunConstructionContext,
     230                 :                              nscoord                aX,
     231                 :                              nscoord                aY,
     232                 :                              nsBidiPositionResolve* aPosResolve = nsnull,
     233                 :                              PRInt32                aPosResolveCount = 0)
     234                 :   {
     235                 :     return ProcessTextForRenderingContext(aText, aLength, aBaseDirection, aPresContext, aRenderingContext,
     236                 :                                           aTextRunConstructionContext, MODE_DRAW, aX, aY, aPosResolve, aPosResolveCount, nsnull);
     237                 :   }
     238                 :   
     239                 :   static nscoord MeasureTextWidth(const PRUnichar*     aText,
     240                 :                                   PRInt32              aLength,
     241                 :                                   nsBidiDirection      aBaseDirection,
     242                 :                                   nsPresContext*       aPresContext,
     243                 :                                   nsRenderingContext&  aRenderingContext)
     244                 :   {
     245                 :     nscoord length;
     246                 :     nsresult rv = ProcessTextForRenderingContext(aText, aLength, aBaseDirection, aPresContext,
     247                 :                                                  aRenderingContext, aRenderingContext,
     248                 :                                                  MODE_MEASURE, 0, 0, nsnull, 0, &length);
     249                 :     return NS_SUCCEEDED(rv) ? length : 0;
     250                 :   }
     251                 : 
     252                 :   /**
     253                 :    * Check if a line is reordered, i.e., if the child frames are not
     254                 :    * all laid out left-to-right.
     255                 :    * @param aFirstFrameOnLine : first frame of the line to be tested
     256                 :    * @param aNumFramesOnLine : number of frames on this line
     257                 :    * @param[out] aLeftMost : leftmost frame on this line
     258                 :    * @param[out] aRightMost : rightmost frame on this line
     259                 :    */
     260                 :   static bool CheckLineOrder(nsIFrame*  aFirstFrameOnLine,
     261                 :                                PRInt32    aNumFramesOnLine,
     262                 :                                nsIFrame** aLeftmost,
     263                 :                                nsIFrame** aRightmost);
     264                 : 
     265                 :   /**
     266                 :    * Get the frame to the right of the given frame, on the same line.
     267                 :    * @param aFrame : We're looking for the frame to the right of this frame.
     268                 :    *                 If null, return the leftmost frame on the line.
     269                 :    * @param aFirstFrameOnLine : first frame of the line to be tested
     270                 :    * @param aNumFramesOnLine : number of frames on this line
     271                 :    */
     272                 :   static nsIFrame* GetFrameToRightOf(const nsIFrame*  aFrame,
     273                 :                                      nsIFrame*        aFirstFrameOnLine,
     274                 :                                      PRInt32          aNumFramesOnLine);
     275                 :     
     276                 :   /**
     277                 :    * Get the frame to the left of the given frame, on the same line.
     278                 :    * @param aFrame : We're looking for the frame to the left of this frame.
     279                 :    *                 If null, return the rightmost frame on the line.
     280                 :    * @param aFirstFrameOnLine : first frame of the line to be tested
     281                 :    * @param aNumFramesOnLine : number of frames on this line
     282                 :    */
     283                 :   static nsIFrame* GetFrameToLeftOf(const nsIFrame*  aFrame,
     284                 :                                     nsIFrame*        aFirstFrameOnLine,
     285                 :                                     PRInt32          aNumFramesOnLine);
     286                 :     
     287                 :   /**
     288                 :    * Get the bidi embedding level of the given (inline) frame.
     289                 :    */
     290                 :   static nsBidiLevel GetFrameEmbeddingLevel(nsIFrame* aFrame);
     291                 : 
     292                 :   /**
     293                 :    * Get the bidi base level of the given (inline) frame.
     294                 :    */
     295                 :   static nsBidiLevel GetFrameBaseLevel(nsIFrame* aFrame);
     296                 : 
     297                 :   enum Mode { MODE_DRAW, MODE_MEASURE };
     298                 : 
     299                 :   /**
     300                 :    * Reorder plain text using the Unicode Bidi algorithm and send it to
     301                 :    * a processor for rendering or measuring
     302                 :    *
     303                 :    * @param[in] aText  the string to be processed (in logical order)
     304                 :    * @param aLength the number of characters in the string
     305                 :    * @param aBaseDirection the base direction of the string
     306                 :    *  NSBIDI_LTR - left-to-right string
     307                 :    *  NSBIDI_RTL - right-to-left string
     308                 :    * @param aPresContext the presentation context
     309                 :    * @param aprocessor the bidi processor
     310                 :    * @param aMode the operation to process
     311                 :    *  MODE_DRAW - invokes DrawText on the processor for each substring
     312                 :    *  MODE_MEASURE - does not invoke DrawText on the processor
     313                 :    *  Note that the string is always measured, regardless of mode
     314                 :    * @param[in,out] aPosResolve array of logical positions to resolve into
     315                 :    *  visual positions; can be nsnull if this functionality is not required
     316                 :    * @param aPosResolveCount number of items in the aPosResolve array
     317                 :    * @param[out] aWidth Pointer to where the width will be stored (may be null)
     318                 :    */
     319                 :   static nsresult ProcessText(const PRUnichar*       aText,
     320                 :                               PRInt32                aLength,
     321                 :                               nsBidiDirection        aBaseDirection,
     322                 :                               nsPresContext*         aPresContext,
     323                 :                               BidiProcessor&         aprocessor,
     324                 :                               Mode                   aMode,
     325                 :                               nsBidiPositionResolve* aPosResolve,
     326                 :                               PRInt32                aPosResolveCount,
     327                 :                               nscoord*               aWidth,
     328                 :                               nsBidi*                aBidiEngine);
     329                 : 
     330                 :   /**
     331                 :    * Make a copy of a string, converting from logical to visual order
     332                 :    *
     333                 :    * @param aSource the source string
     334                 :    * @param aDest the destination string
     335                 :    * @param aBaseDirection the base direction of the string
     336                 :    *       (NSBIDI_LTR or NSBIDI_RTL to force the base direction;
     337                 :    *        NSBIDI_DEFAULT_LTR or NSBIDI_DEFAULT_RTL to let the bidi engine
     338                 :    *        determine the direction from rules P2 and P3 of the bidi algorithm.
     339                 :    *  @see nsBidi::GetPara
     340                 :    * @param aOverride if TRUE, the text has a bidi override, according to
     341                 :    *                    the direction in aDir
     342                 :    */
     343                 :   static void CopyLogicalToVisual(const nsAString& aSource,
     344                 :                                   nsAString& aDest,
     345                 :                                   nsBidiLevel aBaseDirection,
     346                 :                                   bool aOverride);
     347                 : 
     348                 : private:
     349                 :   static nsresult
     350                 :   ProcessTextForRenderingContext(const PRUnichar*       aText,
     351                 :                                  PRInt32                aLength,
     352                 :                                  nsBidiDirection        aBaseDirection,
     353                 :                                  nsPresContext*         aPresContext,
     354                 :                                  nsRenderingContext&    aRenderingContext,
     355                 :                                  nsRenderingContext&    aTextRunConstructionContext,
     356                 :                                  Mode                   aMode,
     357                 :                                  nscoord                aX, // DRAW only
     358                 :                                  nscoord                aY, // DRAW only
     359                 :                                  nsBidiPositionResolve* aPosResolve,  /* may be null */
     360                 :                                  PRInt32                aPosResolveCount,
     361                 :                                  nscoord*               aWidth /* may be null */);
     362                 : 
     363                 :   /**
     364                 :    * Traverse the child frames of the block element and:
     365                 :    *  Set up an array of the frames in logical order
     366                 :    *  Create a string containing the text content of all the frames
     367                 :    *  If we encounter content that requires us to split the element into more
     368                 :    *  than one paragraph for bidi resolution, resolve the paragraph up to that
     369                 :    *  point.
     370                 :    */
     371                 :   static void TraverseFrames(nsBlockFrame*              aBlockFrame,
     372                 :                              nsBlockInFlowLineIterator* aLineIter,
     373                 :                              nsIFrame*                  aCurrentFrame,
     374                 :                              BidiParagraphData*         aBpd);
     375                 :   
     376                 :   /*
     377                 :    * Position aFrame and it's descendants to their visual places. Also if aFrame
     378                 :    * is not leaf, resize it to embrace it's children.
     379                 :    *
     380                 :    * @param aFrame               The frame which itself and its children are going
     381                 :    *                             to be repositioned
     382                 :    * @param aIsOddLevel          TRUE means the embedding level of this frame is odd
     383                 :    * @param[in,out] aLeft        IN value is the starting position of aFrame(without
     384                 :    *                             considering its left margin)
     385                 :    *                             OUT value will be the ending position of aFrame(after
     386                 :    *                             adding its right margin)
     387                 :    * @param aContinuationStates  A map from nsIFrame* to nsFrameContinuationState
     388                 :    */
     389                 :   static void RepositionFrame(nsIFrame*              aFrame,
     390                 :                               bool                   aIsOddLevel,
     391                 :                               nscoord&               aLeft,
     392                 :                               nsContinuationStates*  aContinuationStates);
     393                 : 
     394                 :   /*
     395                 :    * Initialize the continuation state(nsFrameContinuationState) to
     396                 :    * (nsnull, 0) for aFrame and its descendants.
     397                 :    *
     398                 :    * @param aFrame               The frame which itself and its descendants will
     399                 :    *                             be initialized
     400                 :    * @param aContinuationStates  A map from nsIFrame* to nsFrameContinuationState
     401                 :    */
     402                 :   static void InitContinuationStates(nsIFrame*              aFrame,
     403                 :                                      nsContinuationStates*  aContinuationStates);
     404                 : 
     405                 :   /*
     406                 :    * Determine if aFrame is leftmost or rightmost, and set aIsLeftMost and
     407                 :    * aIsRightMost values. Also set continuation states of aContinuationStates.
     408                 :    *
     409                 :    * A frame is leftmost if it's the first appearance of its continuation chain
     410                 :    * on the line and the chain is on its first line if it's LTR or the chain is
     411                 :    * on its last line if it's RTL.
     412                 :    * A frame is rightmost if it's the last appearance of its continuation chain
     413                 :    * on the line and the chain is on its first line if it's RTL or the chain is
     414                 :    * on its last line if it's LTR.
     415                 :    *
     416                 :    * @param aContinuationStates  A map from nsIFrame* to nsFrameContinuationState
     417                 :    * @param[out] aIsLeftMost     TRUE means aFrame is leftmost frame or continuation
     418                 :    * @param[out] aIsRightMost    TRUE means aFrame is rightmost frame or continuation
     419                 :    */
     420                 :    static void IsLeftOrRightMost(nsIFrame*              aFrame,
     421                 :                                  nsContinuationStates*  aContinuationStates,
     422                 :                                  bool&                aIsLeftMost /* out */,
     423                 :                                  bool&                aIsRightMost /* out */);
     424                 : 
     425                 :   /**
     426                 :    *  Adjust frame positions following their visual order
     427                 :    *
     428                 :    *  @param aFirstChild the first kid
     429                 :    *
     430                 :    *  @lina 04/11/2000
     431                 :    */
     432                 :   static void RepositionInlineFrames(BidiLineData* aBld,
     433                 :                                      nsIFrame* aFirstChild);
     434                 :   
     435                 :   /**
     436                 :    * Helper method for Resolve()
     437                 :    * Truncate a text frame to the end of a single-directional run and possibly
     438                 :    * create a continuation frame for the remainder of its content.
     439                 :    *
     440                 :    * @param aFrame       the original frame
     441                 :    * @param aNewFrame    [OUT] the new frame that was created
     442                 :    * @param aFrameIndex  [IN/OUT] index of aFrame in mLogicalFrames
     443                 :    * @param aStart       [IN] the start of the content mapped by aFrame (and 
     444                 :    *                          any fluid continuations)
     445                 :    * @param aEnd         [IN] the offset of the end of the single-directional
     446                 :    *                          text run.
     447                 :    * @see Resolve()
     448                 :    * @see RemoveBidiContinuation()
     449                 :    */
     450                 :   static inline
     451                 :   nsresult EnsureBidiContinuation(nsIFrame*       aFrame,
     452                 :                                   nsIFrame**      aNewFrame,
     453                 :                                   PRInt32&        aFrameIndex,
     454                 :                                   PRInt32         aStart,
     455                 :                                   PRInt32         aEnd);
     456                 : 
     457                 :   /**
     458                 :    * Helper method for Resolve()
     459                 :    * Convert one or more bidi continuation frames created in a previous reflow by
     460                 :    * EnsureBidiContinuation() into fluid continuations.
     461                 :    * @param aFrame       the frame whose continuations are to be removed
     462                 :    * @param aFirstIndex  index of aFrame in mLogicalFrames
     463                 :    * @param aLastIndex   index of the last frame to be removed
     464                 :    * @param aOffset      [OUT] count of directional frames removed. Since
     465                 :    *                     directional frames have control characters
     466                 :    *                     corresponding to them in mBuffer, the pointers to
     467                 :    *                     mBuffer in Resolve() will need to be updated after
     468                 :    *                     deleting the frames.
     469                 :    *
     470                 :    * @see Resolve()
     471                 :    * @see EnsureBidiContinuation()
     472                 :    */
     473                 :   static void RemoveBidiContinuation(BidiParagraphData* aBpd,
     474                 :                                      nsIFrame*          aFrame,
     475                 :                                      PRInt32            aFirstIndex,
     476                 :                                      PRInt32            aLastIndex,
     477                 :                                      PRInt32&           aOffset);
     478                 :   static void CalculateCharType(nsBidi*          aBidiEngine,
     479                 :                                 const PRUnichar* aText,
     480                 :                                 PRInt32&         aOffset,
     481                 :                                 PRInt32          aCharTypeLimit,
     482                 :                                 PRInt32&         aRunLimit,
     483                 :                                 PRInt32&         aRunLength,
     484                 :                                 PRInt32&         aRunCount,
     485                 :                                 PRUint8&         aCharType,
     486                 :                                 PRUint8&         aPrevCharType);
     487                 :   
     488                 :   static void StripBidiControlCharacters(PRUnichar* aText,
     489                 :                                          PRInt32&   aTextLength);
     490                 : 
     491                 :   static bool WriteLogicalToVisual(const PRUnichar* aSrc,
     492                 :                                      PRUint32 aSrcLength,
     493                 :                                      PRUnichar* aDest,
     494                 :                                      nsBidiLevel aBaseDirection,
     495                 :                                      nsBidi* aBidiEngine);
     496                 : 
     497                 :   static void WriteReverse(const PRUnichar* aSrc,
     498                 :                            PRUint32 aSrcLength,
     499                 :                            PRUnichar* aDest);
     500                 : };
     501                 : 
     502                 : #endif /* nsBidiPresUtils_h___ */
     503                 : 
     504                 : #endif // IBMBIDI

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