ftxgdef.c

神龙卡开发原代码

        goto Fail;
      (void)FILE_Seek( cur_offset );
    }

    return TT_Err_Ok;

  Fail:
    for ( n = 0; n < count; n++ )
      Free_CaretValue( &cv[n] );

    FREE( cv );
    return error;
  }


  static void  Free_LigGlyph( TTO_LigGlyph*  lg )
  {
    UShort           n, count;

    TTO_CaretValue*  cv;


    if ( lg->CaretValue )
    {
      count = lg->CaretCount;
      cv    = lg->CaretValue;

      for ( n = 0; n < count; n++ )
        Free_CaretValue( &cv[n] );

      FREE( cv );
    }
  }


  /* LigCaretList */

  static TT_Error  Load_LigCaretList( TTO_LigCaretList*  lcl,
                                      PFace              input )
  {
    DEFINE_LOAD_LOCALS( input->stream );

    UShort         n, count;
    ULong          cur_offset, new_offset, base_offset;

    TTO_LigGlyph*  lg;


    base_offset = FILE_Pos();

    if ( ACCESS_Frame( 2L ) )
      return error;

    new_offset = GET_UShort() + base_offset;

    FORGET_Frame();

    cur_offset = FILE_Pos();
    if ( FILE_Seek( new_offset ) ||
         ( error = Load_Coverage( &lcl->Coverage, input ) ) != TT_Err_Ok )
      return error;
    (void)FILE_Seek( cur_offset );

    if ( ACCESS_Frame( 2L ) )
      goto Fail2;

    count = lcl->LigGlyphCount = GET_UShort();

    FORGET_Frame();

    lcl->LigGlyph = NULL;

    if ( ALLOC_ARRAY( lcl->LigGlyph, count, TTO_LigGlyph ) )
      goto Fail2;

    lg = lcl->LigGlyph;

    for ( n = 0; n < count; n++ )
    {
      if ( ACCESS_Frame( 2L ) )
        goto Fail1;

      new_offset = GET_UShort() + base_offset;

      FORGET_Frame();

      cur_offset = FILE_Pos();
      if ( FILE_Seek( new_offset ) ||
           ( error = Load_LigGlyph( &lg[n], input ) ) != TT_Err_Ok )
        goto Fail1;
      (void)FILE_Seek( cur_offset );
    }

    lcl->loaded = TRUE;

    return TT_Err_Ok;

  Fail1:
    for ( n = 0; n < count; n++ )
      Free_LigGlyph( &lg[n] );

    FREE( lg );

  Fail2:
    Free_Coverage( &lcl->Coverage );
    return error;
  }


  static void  Free_LigCaretList( TTO_LigCaretList*  lcl )
  {
    UShort         n, count;

    TTO_LigGlyph*  lg;


    if ( !lcl->loaded )
      return;

    if ( lcl->LigGlyph )
    {
      count = lcl->LigGlyphCount;
      lg    = lcl->LigGlyph;

      for ( n = 0; n < count; n++ )
        Free_LigGlyph( &lg[n] );

      FREE( lg );
    }

    Free_Coverage( &lcl->Coverage );
  }



  /***********
   * GDEF API
   ***********/


  static UShort  Get_New_Class( TTO_GDEFHeader*  gdef,
                                UShort           glyphID,
                                UShort           index )
  {
    UShort                 glyph_index, array_index;
    UShort                 byte, bits;

    TTO_ClassRangeRecord*  gcrr;
    UShort**               ngc;


    if ( glyphID >= gdef->LastGlyph )
      return 0;

    gcrr = gdef->GlyphClassDef.cd.cd2.ClassRangeRecord;
    ngc  = gdef->NewGlyphClasses;

    if ( glyphID < gcrr[index].Start )
    {
      array_index = 0;
      if ( index == 0 )
        glyph_index = glyphID;
      else
        glyph_index = glyphID - gcrr[index - 1].End - 1;
    }
    else
    {
      array_index = index + 1;
      glyph_index = glyphID - gcrr[index].End - 1;
    }

    byte = ngc[array_index][glyph_index / 4 + 1];
    bits = byte >> ( 16 - ( glyph_index % 4 + 1 ) * 4 );

    return bits & 0x000F;
  }


  EXPORT_FUNC
  TT_Error  TT_GDEF_Get_Glyph_Property( TTO_GDEFHeader*  gdef,
                                        TT_UShort        glyphID,
                                        TT_UShort*       property )
  {
    UShort    class, index;

    TT_Error  error;


    if ( !gdef || !property )
      return TT_Err_Invalid_Argument;

    /* first, we check for mark attach classes */

    if ( gdef->MarkAttachClassDef.loaded )
    {
      error = Get_Class( &gdef->MarkAttachClassDef, glyphID, &class, &index );
      if ( error && error != TTO_Err_Not_Covered )
        return error;
      if ( !error )
      {
        *property = class << 8;
        return TT_Err_Ok;
      }
    }

    error = Get_Class( &gdef->GlyphClassDef, glyphID, &class, &index );
    if ( error && error != TTO_Err_Not_Covered )
      return error;

    /* if we have a constructed class table, check whether additional
       values have been assigned                                      */

    if ( error == TTO_Err_Not_Covered && gdef->NewGlyphClasses )
      class = Get_New_Class( gdef, glyphID, index );

    switch ( class )
    {
    case UNCLASSIFIED_GLYPH:
      *property = 0;
      break;

    case SIMPLE_GLYPH:
      *property = TTO_BASE_GLYPH;
      break;

    case LIGATURE_GLYPH:
      *property = TTO_LIGATURE;
      break;

    case MARK_GLYPH:
      *property = TTO_MARK;
      break;

    case COMPONENT_GLYPH:
      *property = TTO_COMPONENT;
      break;
    }

    return TT_Err_Ok;
  }


  static TT_Error  Make_ClassRange( TTO_ClassDefinition*  cd,
                                    UShort                start,
                                    UShort                end,
                                    UShort                class )
  {
    TT_Error               error;
    UShort                 index;

    TTO_ClassDefFormat2*   cdf2;
    TTO_ClassRangeRecord*  crr;


    cdf2 = &cd->cd.cd2;

    cdf2->ClassRangeCount++;

    if ( REALLOC_ARRAY( cdf2->ClassRangeRecord, cdf2->ClassRangeCount,
                        TTO_ClassRangeRecord ) )
      return error;

    crr   = cdf2->ClassRangeRecord;
    index = cdf2->ClassRangeCount - 1;

    crr[index].Start = start;
    crr[index].End   = end;
    crr[index].Class = class;

    cd->Defined[class] = TRUE;

    return TT_Err_Ok;
  }


  EXPORT_FUNC
  TT_Error  TT_GDEF_Build_ClassDefinition( TTO_GDEFHeader*  gdef,
                                           TT_UShort        num_glyphs,
                                           TT_UShort        glyph_count,
                                           TT_UShort*       glyph_array,
                                           TT_UShort*       class_array )
  {
    UShort                 start, curr_glyph, curr_class;
    UShort                 n, count;
    TT_Error               error;

    TTO_ClassDefinition*   gcd;
    TTO_ClassRangeRecord*  gcrr;
    UShort**               ngc;


    if ( !gdef || !glyph_array || !class_array )
      return TT_Err_Invalid_Argument;

    gcd = &gdef->GlyphClassDef;

    /* We build a format 2 table */

    gcd->ClassFormat = 2;

    /* A GlyphClassDef table contains at most 5 different class values */

    if ( ALLOC_ARRAY( gcd->Defined, 5, Bool ) )
      return error;

    gcd->cd.cd2.ClassRangeCount  = 0;
    gcd->cd.cd2.ClassRangeRecord = NULL;

    start      = glyph_array[0];
    curr_class = class_array[0];
    curr_glyph = start;

    if ( curr_class >= 5 )
    {
      error = TT_Err_Invalid_Argument;
      goto Fail4;
    }

    glyph_count--;

    for ( n = 0; n <= glyph_count; n++ )
    {
      if ( curr_glyph == glyph_array[n] && curr_class == class_array[n] )
      {
        if ( n == glyph_count )
        {
          if ( ( error = Make_ClassRange( gcd, start,
                                          curr_glyph,
                                          curr_class ) ) != TT_Err_Ok )
            goto Fail3;
        }
        else
        {
          if ( curr_glyph == 0xFFFF )
          {
            error = TT_Err_Invalid_Argument;
            goto Fail3;
          }
          else
            curr_glyph++;
        }
      }
      else
      {
        if ( ( error = Make_ClassRange( gcd, start,
                                        curr_glyph - 1,
                                        curr_class ) ) != TT_Err_Ok )
          goto Fail3;

        if ( curr_glyph > glyph_array[n] )
        {
          error = TT_Err_Invalid_Argument;
          goto Fail3;
        }

        start      = glyph_array[n];
        curr_class = class_array[n];
        curr_glyph = start;

        if ( curr_class >= 5 )
        {
          error = TT_Err_Invalid_Argument;
          goto Fail3;
        }

        if ( n == glyph_count )
        {
          if ( ( error = Make_ClassRange( gcd, start,
                                          curr_glyph,
                                          curr_class ) ) != TT_Err_Ok )
            goto Fail3;
        }
        else
        {
          if ( curr_glyph == 0xFFFF )
          {
            error = TT_Err_Invalid_Argument;
            goto Fail3;
          }
          else
            curr_glyph++;
        }
      }
    }

    /* now prepare the arrays for class values assigned during the lookup
       process                                                            */

    if ( ALLOC_ARRAY( gdef->NewGlyphClasses,
                      gcd->cd.cd2.ClassRangeCount + 1, UShort* ) )
      goto Fail2;

    count = gcd->cd.cd2.ClassRangeCount;
    gcrr  = gcd->cd.cd2.ClassRangeRecord;
    ngc   = gdef->NewGlyphClasses;

    /* We allocate arrays for all glyphs not covered by the class range
       records.  Each element holds four class values.                  */

    if ( gcrr[0].Start )
    {
      if ( ALLOC_ARRAY( ngc[0], gcrr[0].Start / 4 + 1, UShort ) )
        goto Fail1;
    }

    for ( n = 1; n < count; n++ )
    {
      if ( gcrr[n].Start - gcrr[n - 1].End > 1 )
        if ( ALLOC_ARRAY( ngc[n],
                          ( gcrr[n].Start - gcrr[n - 1].End - 1 ) / 4 + 1,
                          UShort ) )
          goto Fail1;
    }

    if ( gcrr[count - 1].End != num_glyphs - 1 )
    {
      if ( ALLOC_ARRAY( ngc[count],
                        ( num_glyphs - gcrr[count - 1].End - 1 ) / 4 + 1,
                        UShort ) )
        goto Fail1;
    }

    gdef->LastGlyph = num_glyphs - 1;

    gdef->MarkAttachClassDef_offset = 0L;
    gdef->MarkAttachClassDef.loaded = FALSE;

    return TT_Err_Ok;

  Fail1:
    for ( n = 0; n < count; n++ )
      FREE( ngc[n] );

  Fail2:
    FREE( gdef->NewGlyphClasses );

  Fail3:
    FREE( gcd->cd.cd2.ClassRangeRecord );

  Fail4:
    FREE( gcd->Defined );
    return error;
  }


  static void  Free_NewGlyphClasses( TTO_GDEFHeader*  gdef )
  {
    UShort**  ngc;
    UShort    n, count;


    if ( gdef->NewGlyphClasses )
    {
      count = gdef->GlyphClassDef.cd.cd2.ClassRangeCount + 1;
      ngc   = gdef->NewGlyphClasses;

      for ( n = 0; n < count; n++ )
        FREE( ngc[n] );

      FREE( ngc );
    }
  }


  TT_Error  Add_Glyph_Property( TTO_GDEFHeader*  gdef,
                                UShort           glyphID,
                                UShort           property )
  {
    TT_Error               error;
    UShort                 class, new_class, index;
    UShort                 byte, bits, mask;
    UShort                 array_index, glyph_index;

    TTO_ClassRangeRecord*  gcrr;
    UShort**               ngc;


    error = Get_Class( &gdef->GlyphClassDef, glyphID, &class, &index );
    if ( error && error != TTO_Err_Not_Covered )
      return error;

    /* we don't accept glyphs covered in `GlyphClassDef' */

    if ( !error )
      return TTO_Err_Not_Covered;

    switch ( property )
    {
    case 0:
      new_class = UNCLASSIFIED_GLYPH;
      break;

    case TTO_BASE_GLYPH:
      new_class = SIMPLE_GLYPH;
      break;

    case TTO_LIGATURE:
      new_class = LIGATURE_GLYPH;
      break;

    case TTO_MARK:
      new_class = MARK_GLYPH;
      break;

    case TTO_COMPONENT:
      new_class = COMPONENT_GLYPH;
      break;

    default:
      return TT_Err_Invalid_Argument;
    }

    gcrr = gdef->GlyphClassDef.cd.cd2.ClassRangeRecord;
    ngc  = gdef->NewGlyphClasses;

    if ( glyphID < gcrr[index].Start )
    {
      array_index = 0;
      if ( index == 0 )
        glyph_index = glyphID;
      else
        glyph_index = glyphID - gcrr[index - 1].End - 1;
    }
    else
    {
      array_index = index + 1;
      glyph_index = glyphID - gcrr[index].End - 1;
    }

    byte  = ngc[array_index][glyph_index / 4 + 1];
    bits  = byte >> ( 16 - ( glyph_index % 4 + 1 ) * 4 );
    class = bits & 0x000F;

    /* we don't overwrite existing entries */

    if ( !class )
    {
      bits = new_class << ( 16 - ( glyph_index % 4 + 1 ) * 4 );
      mask = ~( 0x000F << ( 16 - ( glyph_index % 4 + 1 ) * 4 ) );

      ngc[array_index][glyph_index / 4 + 1] &= mask;
      ngc[array_index][glyph_index / 4 + 1] |= bits;
    }

    return TT_Err_Ok;
  }


/* END */