kc3-lang/freetype/src/type1z/z1gload.c

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• Hash : f9ca2bb5
  Author :
  Date : 2000-06-30T23:12:55
  

  managed to re-design entirely the API in <freetype/ftglyph.h> It is now really the "glyph factory" that Stefan was probably dreaming about.. fixed some recent formatting errors from Werner ;-) cleaned up the demonstration programs from most of the rust that they had, though I'm sure someone is going to re-format them really soon !! "ftstring" now uses the new ftglyph.h API, and is now faster and smaller.. yep..

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• src/type1z/z1gload.c

• /*******************************************************************
   *
   *  t1gload.c                                                   1.0
   *
   *    Type1 Glyph Loader.
   *
   *  Copyright 1996-1999 by
   *  David Turner, Robert Wilhelm, and Werner Lemberg.
   *
   *  This file is part of the FreeType project, and may only be used
   *  modified and distributed under the terms of the FreeType project
   *  license, LICENSE.TXT.  By continuing to use, modify, or distribute
   *  this file you indicate that you have read the license and
   *  understand and accept it fully.
   *
   ******************************************************************/
  
  #include <z1gload.h>
  #include <freetype/internal/ftdebug.h>
  #include <freetype/internal/ftstream.h>
  #include <freetype/ftoutln.h>
  
  #undef  FT_COMPONENT
  #define FT_COMPONENT  trace_t1gload
  
    typedef enum Z1_Operator_
    {
      op_none = 0,
      op_endchar,
      op_hsbw,
      op_seac,
      op_sbw,
      op_closepath,
      op_hlineto,
      op_hmoveto,
      op_hvcurveto,
      op_rlineto,
      op_rmoveto,
      op_rrcurveto,
      op_vhcurveto,
      op_vlineto,
      op_vmoveto,
      op_dotsection,
      op_hstem,
      op_hstem3,
      op_vstem,
      op_vstem3,
      op_div,
      op_callothersubr,
      op_callsubr,
      op_pop,
      op_return,
      op_setcurrentpoint,
  
      op_max    /* never remove this one */
  
    } Z1_Operator;
  
    static const FT_Int  t1_args_count[ op_max ] =
    {
      0, /* none */
      0, /* endchar */
      2, /* hsbw */
      5, /* seac */
      4, /* sbw */
      0, /* closepath */
      1, /* hlineto */
      1, /* hmoveto */
      4, /* hvcurveto */
      2, /* rlineto */
      2, /* rmoveto */
      6, /* rrcurveto */
      4, /* vhcurveto */
      1, /* vlineto */
      1, /* vmoveto */
      0, /* dotsection */
      2, /* hstem */
      6, /* hstem3 */
      2, /* vstem */
      6, /* vstem3 */
      2, /* div */
     -1, /* callothersubr */
      1, /* callsubr */
      0, /* pop */
      0, /* return */
      2  /* setcurrentpoint */
    };
  
  
    /**********************************************************************/
    /**********************************************************************/
    /**********************************************************************/
    /**********                                                   *********/
    /**********                                                   *********/
    /**********           GENERIC CHARSTRINGS PARSING             *********/
    /**********                                                   *********/
    /**********                                                   *********/
    /**********************************************************************/
    /**********************************************************************/
    /**********************************************************************/
  
  /*********************************************************************
   *
   * <Function>
   *    Z1_Init_Builder
   *
   * <Description>
   *    Initialise a given glyph builder.
   *
   * <Input>
   *    builder :: glyph builder to initialise
   *    face    :: current face object
   *    size    :: current size object
   *    glyph   :: current glyph object
   *
   *********************************************************************/
  
    LOCAL_FUNC
    void  Z1_Init_Builder( Z1_Builder*   builder,
                           T1_Face       face,
                           Z1_Size       size,
                           Z1_GlyphSlot  glyph )
    {
      builder->path_begun  = 0;
      builder->load_points = 1;
  
      builder->face   = face;
      builder->glyph  = glyph;
      builder->memory = face->root.memory;
  
      if (glyph)
      {
        FT_GlyphLoader*  loader = glyph->root.loader;
        
        builder->loader = loader;
        builder->current = &loader->current.outline;
        builder->base    = &loader->base.outline;
  
        FT_GlyphLoader_Rewind(loader);
      }
  
      if (size)
      {
        builder->scale_x = size->root.metrics.x_scale;
        builder->scale_y = size->root.metrics.y_scale;
      }
  
      builder->pos_x = 0;
      builder->pos_y = 0;
  
      builder->left_bearing.x = 0;
      builder->left_bearing.y = 0;
      builder->advance.x      = 0;
      builder->advance.y      = 0;
    }
  
  
  /*********************************************************************
   *
   * <Function>
   *    Z1_Done_Builder
   *
   * <Description>
   *    Finalise a given glyph builder. Its content can still be
   *    used after the call, but the function saves important information
   *    within the corresponding glyph slot.
   *
   * <Input>
   *    builder :: glyph builder to initialise
   *
   *********************************************************************/
  
    LOCAL_FUNC
    void Z1_Done_Builder( Z1_Builder*  builder )
    {
      Z1_GlyphSlot  glyph = builder->glyph;
  
      if (glyph)
        glyph->root.outline = *builder->base;
    }
  
  
  
  /*********************************************************************
   *
   * <Function>
   *    Z1_Init_Decoder
   *
   * <Description>
   *    Initialise a given Type 1 decoder for parsing
   *
   * <Input>
   *    decoder :: Type 1 decoder to initialise
   *    funcs   :: hinter functions interface
   *
   *********************************************************************/
  
    LOCAL_FUNC
    void  Z1_Init_Decoder( Z1_Decoder* decoder )
    {
      decoder->top              = 0;
      decoder->zone             = 0;
      decoder->flex_state       = 0;
      decoder->num_flex_vectors = 0;
      decoder->blend            = 0;
  
      /* Clear loader */
      MEM_Set( &decoder->builder, 0, sizeof(decoder->builder) );
    }
  
  
    /* check that there is enough room for "count" more points */
    static
    FT_Error  check_points( Z1_Builder*  builder,
                            FT_Int       count )
    {
      return FT_GlyphLoader_Check_Points( builder->loader, count, 0 );
    }
  
  
    /* add a new point, do not check room */
    static
    void  add_point( Z1_Builder*  builder,
                     FT_Pos       x,
                     FT_Pos       y,
                     FT_Byte      flag )
    {
      FT_Outline*  outline = builder->current;
  
      if (builder->load_points)
      {
        FT_Vector*  point   = outline->points + outline->n_points;
        FT_Byte*    control = (FT_Byte*)outline->tags + outline->n_points;
  
        point->x = x;
        point->y = y;
        *control = ( flag ? FT_Curve_Tag_On : FT_Curve_Tag_Cubic );
  
        builder->last = *point;
      }
  
      outline->n_points++;
    }
  
  
    /* check room for a new on-curve point, then add it */
    static
    FT_Error  add_point1( Z1_Builder*  builder,
                          FT_Pos       x,
                          FT_Pos       y )
    {
      FT_Error  error;
  
      error = check_points(builder,1);
      if (!error)
        add_point( builder, x, y, 1 );
  
      return error;
    }
  
  
    /* check room for a new contour, then add it */
    static
    FT_Error  add_contour( Z1_Builder*  builder )
    {
      FT_Outline*  outline = builder->current;
      FT_Error     error;
  
      if (!builder->load_points)
      {
        outline->n_contours++;
        return FT_Err_Ok;
      }
  
      /* realloc contours array if necessary */
      error = FT_GlyphLoader_Check_Points( builder->loader, 0, 1 );
      if (!error)
      {
        if (outline->n_contours > 0)
          outline->contours[ outline->n_contours-1 ] = outline->n_points-1;
          
        outline->n_contours++;
      }
      return error;
    }
  
    /* if a path was begun, add its first on-curve point */
    static
    FT_Error  start_point( Z1_Builder*  builder,
                           FT_Pos       x,
                           FT_Pos       y )
    {
      /* test wether we're building a new contour */
      if (!builder->path_begun)
      {
        FT_Error  error;
  
        builder->path_begun = 1;
        error = add_contour( builder );
        if (error) return error;
      }
      return add_point1( builder, x, y );
    }
  
  
    /* close the current contour */
    static
    void  close_contour( Z1_Builder*  builder )
    {
      FT_Outline*  outline = builder->current;
  
      /* XXXX : we must not include the last point in the path if it */
      /*        is located on the first point..                      */
      if (outline->n_points > 1)
      {
        FT_Int      first = 0;
        FT_Vector*  p1    = outline->points + first;
        FT_Vector*  p2    = outline->points + outline->n_points-1;
        
        if (outline->n_contours > 1)
        {
          first = outline->contours[outline->n_contours-2]+1;
          p1    = outline->points + first;
        }
          
        if ( p1->x == p2->x && p1->y == p2->y )
          outline->n_points--;
      }
      
      if ( outline->n_contours > 0 )
        outline->contours[outline->n_contours-1] = outline->n_points-1;
    }
  
  
  /*********************************************************************
   *
   * <Function>
   *    lookup_glyph_by_stdcharcode
   *
   * <Description>
   *    Lookup a given glyph by its StandardEncoding charcode. Used
   *    to implement the SEAC Type 1 operator.
   *
   * <Input>
   *    face     :: current face object
   *    charcode :: charcode to look for
   *
   * <Return>
   *    glyph index in font face. Returns -1 if the corresponding
   *    glyph wasn't found.
   *
   *********************************************************************/
  
    static
    FT_Int    lookup_glyph_by_stdcharcode( T1_Face  face,
                                           FT_Int   charcode )
    {
      FT_Int              n;
      const FT_String*    glyph_name;
      PSNames_Interface*  psnames = (PSNames_Interface*)face->psnames;
  
      /* check range of standard char code */
      if (charcode < 0 || charcode > 255)
        return -1;
  
      glyph_name = psnames->adobe_std_strings(
                      psnames->adobe_std_encoding[charcode]);
  
      for ( n = 0; n < face->type1.num_glyphs; n++ )
      {
        FT_String*  name = (FT_String*)face->type1.glyph_names[n];
  
        if ( name && strcmp(name,glyph_name) == 0 )
          return n;
      }
  
      return -1;
    }
  
  
  
  /*********************************************************************
   *
   * <Function>
   *    t1operator_seac
   *
   * <Description>
   *    Implements the "seac" Type 1 operator for a Type 1 decoder
   *
   * <Input>
   *    decoder  :: current Type 1 decoder
   *    asb      :: accent's side bearing
   *    adx      :: horizontal position of accent
   *    ady      :: vertical position of accent
   *    bchar    :: base character's StandardEncoding charcode
   *    achar    :: accent character's StandardEncoding charcode
   *
   * <Return>
   *    Error code. 0 means success.
   *
   *********************************************************************/
  
    static
    FT_Error  t1operator_seac( Z1_Decoder*  decoder,
                               FT_Pos       asb,
                               FT_Pos       adx,
                               FT_Pos       ady,
                               FT_Int       bchar,
                               FT_Int       achar )
    {
      FT_Error     error;
      FT_Int       bchar_index, achar_index, n_base_points;
      FT_Outline*  cur  = decoder->builder.current;
      FT_Outline*  base = decoder->builder.base;
      FT_Vector    left_bearing, advance;
      T1_Face      face  = decoder->builder.face;
      T1_Font*     type1 = &face->type1;
  
      bchar_index = lookup_glyph_by_stdcharcode( face, bchar );
      achar_index = lookup_glyph_by_stdcharcode( face, achar );
  
      if ( bchar_index < 0 || achar_index < 0 )
      {
        FT_ERROR(( "t1operator_seac: invalid seac character code arguments\n" ));
        return T1_Err_Syntax_Error;
      }
  
      /* if we are trying to load a composite glyph, do not load the */
      /* accent character and return the array of subglyphs.         */
      if ( decoder->builder.no_recurse )
      {
  
        FT_GlyphSlot     glyph = (FT_GlyphSlot)decoder->builder.glyph;
        FT_GlyphLoader*  loader = glyph->loader;
        FT_SubGlyph*     subg;
  
        /* reallocate subglyph array if necessary */
        error = FT_GlyphLoader_Check_Subglyphs( loader, 2 );
        if (error) goto Exit;
        
        subg = loader->current.subglyphs;
  
        /* subglyph 0 = base character */
        subg->index = bchar_index;
        subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES |
                      FT_SUBGLYPH_FLAG_USE_MY_METRICS;
        subg->arg1  = 0;
        subg->arg2  = 0;
        subg++;
  
        /* subglyph 1 = accent character */
        subg->index = achar_index;
        subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES;
        subg->arg1  = adx - asb;
        subg->arg2  = ady;
  
        /* set up remaining glyph fields */
        glyph->num_subglyphs = 2;
        glyph->subglyphs     = loader->base.subglyphs;
        glyph->format        = ft_glyph_format_composite;
        
        loader->current.num_subglyphs = 2;
      }
  
      /* First load `bchar' in builder */
      /* now load the unscaled outline */
      
      FT_GlyphLoader_Prepare( decoder->builder.loader );  /* prepare loader */
  
      error = Z1_Parse_CharStrings( decoder,
                                    type1->charstrings    [bchar_index],
                                    type1->charstrings_len[bchar_index],
                                    type1->num_subrs,
                                    type1->subrs,
                                    type1->subrs_len );
      if ( error ) goto Exit;
  
      n_base_points = cur->n_points;
  
      {
        /* save the left bearing and width of the base character */
        /* as they will be erased by the next load.              */
  
        left_bearing = decoder->builder.left_bearing;
        advance      = decoder->builder.advance;
  
        decoder->builder.left_bearing.x = 0;
        decoder->builder.left_bearing.y = 0;
  
        /* Now load `achar' on top of */
        /* the base outline           */
        error = Z1_Parse_CharStrings( decoder,
                                      type1->charstrings    [achar_index],
                                      type1->charstrings_len[achar_index],
                                      type1->num_subrs,
                                      type1->subrs,
                                      type1->subrs_len );
        if ( error ) return error;
  
        /* restore the left side bearing and   */
        /* advance width of the base character */
  
        decoder->builder.left_bearing = left_bearing;
        decoder->builder.advance      = advance;
  
        /* Finally, move the accent */
        if ( decoder->builder.load_points )
        {
          FT_Outline  dummy;
          
          dummy.n_points = base->n_points - n_base_points;
          dummy.points   = base->points   + n_base_points;
          FT_Outline_Translate( &dummy, adx - asb, ady );
        }
      }
    Exit:
      return error;
    }
  
  
  /*********************************************************************
   *
   * <Function>
   *    Z1_Parse_CharStrings
   *
   * <Description>
   *    Parses a given Type 1 charstrings program
   *
   * <Input>
   *    decoder          :: current Type 1 decoder
   *    charstring_base  :: base of the charstring stream
   *    charstring_len   :: length in bytes of the charstring stream
   *    num_subrs        :: number of sub-routines
   *    subrs_base       :: array of sub-routines addresses
   *    subrs_len        :: array of sub-routines lengths
   *
   * <Return>
   *    Error code. 0 means success.
   *
   *********************************************************************/
  
  #define USE_ARGS(n)  top -= n; if (top < decoder->stack) goto Stack_Underflow
  
    LOCAL_FUNC
    FT_Error   Z1_Parse_CharStrings( Z1_Decoder*  decoder,
                                     FT_Byte*     charstring_base,
                                     FT_Int       charstring_len,
                                     FT_Int       num_subrs,
                                     FT_Byte**    subrs_base,
                                     FT_Int*      subrs_len )
    {
      FT_Error            error;
      Z1_Decoder_Zone*    zone;
      FT_Byte*            ip;
      FT_Byte*            limit;
      Z1_Builder*         builder = &decoder->builder;
      FT_Outline*         outline;
      FT_Pos              x, y;
  
      /* First of all, initialise the decoder */
      decoder->top  = decoder->stack;
      decoder->zone = decoder->zones;
      zone          = decoder->zones;
  
      builder->path_begun  = 0;
  
      zone->base           = charstring_base;
      limit = zone->limit  = charstring_base + charstring_len;
      ip    = zone->cursor = zone->base;
  
      error   = T1_Err_Ok;
      outline = builder->current;
  
      x = builder->pos_x;
      y = builder->pos_y;
  
      /* now, execute loop */
      while ( ip < limit )
      {
        FT_Int*      top      = decoder->top;
        Z1_Operator  op       = op_none;
        FT_Long      value    = 0;
  
        /********************************************************************/
        /*                                                                  */
        /* Decode operator or operand                                       */
        /*                                                                  */
        /*                                                                  */
  
        /* First of all, decompress operator or value */
        switch (*ip++)
        {
          case 1:  op = op_hstem;     break;
  
          case 3:  op = op_vstem;     break;
          case 4:  op = op_vmoveto;   break;
          case 5:  op = op_rlineto;   break;
          case 6:  op = op_hlineto;   break;
          case 7:  op = op_vlineto;   break;
          case 8:  op = op_rrcurveto; break;
          case 9:  op = op_closepath; break;
          case 10: op = op_callsubr;  break;
          case 11: op = op_return;    break;
  
          case 13: op = op_hsbw;      break;
          case 14: op = op_endchar;   break;
  
          case 21: op = op_rmoveto;   break;
          case 22: op = op_hmoveto;   break;
  
          case 30: op = op_vhcurveto; break;
          case 31: op = op_hvcurveto; break;
  
          case 12:
            {
              if (ip > limit)
              {
                FT_ERROR(( "T1.Parse_CharStrings : invalid escape (12+EOF)\n" ));
                goto Syntax_Error;
              }
  
              switch (*ip++)
              {
                case 0:  op = op_dotsection;      break;
                case 1:  op = op_vstem3;          break;
                case 2:  op = op_hstem3;          break;
                case 6:  op = op_seac;            break;
                case 7:  op = op_sbw;             break;
                case 12: op = op_div;             break;
                case 16: op = op_callothersubr;   break;
                case 17: op = op_pop;             break;
                case 33: op = op_setcurrentpoint; break;
  
                default:
                  FT_ERROR(( "T1.Parse_CharStrings : invalid escape (12+%d)\n",
                           ip[-1] ));
                  goto Syntax_Error;
              }
            }
            break;
  
          case 255:    /* four bytes integer */
            {
              if (ip+4 > limit)
              {
                FT_ERROR(( "T1.Parse_CharStrings : unexpected EOF in integer\n" ));
                goto Syntax_Error;
              }
  
              value = ((long)ip[0] << 24) |
                      ((long)ip[1] << 16) |
                      ((long)ip[2] << 8)  |
                             ip[3];
              ip += 4;
            }
            break;
  
          default:
            if (ip[-1] >= 32)
            {
              if (ip[-1] < 247)
                value = (long)ip[-1] - 139;
              else
              {
                if (++ip > limit)
                {
                  FT_ERROR(( "T1.Parse_CharStrings : unexpected EOF in integer\n" ));
                  goto Syntax_Error;
                }
  
                if (ip[-2] < 251)
                  value =  ((long)(ip[-2]-247) << 8) + ip[-1] + 108;
                else
                  value = -((((long)ip[-2]-251) << 8) + ip[-1] + 108 );
              }
            }
            else
            {
              FT_ERROR(( "T1.Parse_CharStrings : invalid byte (%d)\n",
                       ip[-1] ));
              goto Syntax_Error;
            }
        }
  
        /********************************************************************/
        /*                                                                  */
        /*  Push value on stack, or process operator                        */
        /*                                                                  */
        /*                                                                  */
        if ( op == op_none )
        {
          if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS )
          {
            FT_ERROR(( "T1.Parse_CharStrings : Stack overflow !!\n" ));
            goto Syntax_Error;
          }
  
          FT_TRACE4(( " %ld", value ));
          *top++       = value;
          decoder->top = top;
        }
        else if ( op == op_callothersubr )  /* callothersubr */
        {
          FT_TRACE4(( " callothersubr" ));
          if ( top - decoder->stack < 2 )
            goto Stack_Underflow;
  
          top -= 2;
          switch ( top[1] )
          {
            case 1: /* start flex feature ---------------------- */
              {
                if ( top[0] != 0 ) goto Unexpected_OtherSubr;
  
                decoder->flex_state        = 1;
                decoder->num_flex_vectors  = 0;
                if ( start_point(builder, x, y) ||
                     check_points(builder,6) ) goto Memory_Error;
              }
              break;
  
            case 2: /* add flex vectors ------------------------ */
              {
                FT_Int      index;
  
                if ( top[0] != 0 ) goto Unexpected_OtherSubr;
  
                /* note that we should not add a point for index 0 */
                /* this will move our current position to the flex */
                /* point without adding any point to the outline   */
                index = decoder->num_flex_vectors++;
                if (index > 0 && index < 7)
                  add_point( builder,
                             x,
                             y,
                             (FT_Byte)( index==3 || index==6 ) );
              }
              break;
  
            case 0: /* end flex feature ------------------------- */
              {
                if ( top[0] != 3 ) goto Unexpected_OtherSubr;
  
                if ( decoder->flex_state       == 0 ||
                     decoder->num_flex_vectors != 7 )
                {
                  FT_ERROR(( "T1.Parse_CharStrings: unexpected flex end\n" ));
                  goto Syntax_Error;
                }
  
                /* now consume the remaining "pop pop setcurpoint" */
                if ( ip+6 > limit ||
                     ip[0] != 12  || ip[1] != 17 || /* pop */
                     ip[2] != 12  || ip[3] != 17 || /* pop */
                     ip[4] != 12  || ip[5] != 33 )  /* setcurpoint */
                {
                  FT_ERROR(( "T1.Parse_CharStrings: invalid flex charstring\n" ));
                  goto Syntax_Error;
                }
  
                ip += 6;
                decoder->flex_state = 0;
                break;
              }
  
            case 3:  /* change hints ---------------------------- */
              {
                if ( top[0] != 1 ) goto Unexpected_OtherSubr;
  
                /* eat the following "pop" */
                if (ip+2 > limit)
                {
                  FT_ERROR(( "T1.Parse_CharStrings: invalid escape (12+%d)\n",
                           ip[-1] ));
                  goto Syntax_Error;
                }
  
                if (ip[0] != 12 || ip[1] != 17)
                {
                  FT_ERROR(( "T1.Parse_CharStrings: 'pop' expected, found (%d %d)\n",
                           ip[0], ip[1] ));
                  goto Syntax_Error;
                }
                ip += 2;
                break;;
              }
  
            case 12:
            case 13:
              {
                /* counter control hints, clear stack */
                top = decoder->stack;
                break;
              }
            
            case 14:
            case 15:
            case 16:
            case 17:
            case 18: /* multiple masters */
              {
                T1_Blend*  blend = decoder->blend;
                FT_UInt    num_points, nn, mm;
                FT_Int*    delta;
                FT_Int*    values;
                
                if (!blend)
                {
                  FT_ERROR(( "T1.Parse_CharStrings: unexpected multiple masters operator !!\n" ));
                  goto Syntax_Error;
                }
                
                num_points = top[1] - 13 + (top[1] == 18);
                if (top[0] != (FT_Int)(num_points*blend->num_designs))
                {
                  FT_ERROR(( "T1.Parse_CharStrings: incorrect number of mm arguments\n" ));
                  goto Syntax_Error;
                }
                
                top       -= blend->num_designs*num_points;
                if (top < decoder->stack)
                  goto Stack_Underflow;
  
                /* we want to compute:                                   */
                /*                                                       */
                /*  a0*w0 + a1*w1 + ... + ak*wk                          */
                /*                                                       */
                /* but we only have the a0, a1-a0, a2-a0, .. ak-a0       */
                /* however, given that w0 + w1 + ... + wk == 1, we can   */
                /* rewrite it easily as:                                 */
                /*                                                       */
                /*  a0 + (a1-a0)*w1 + (a2-a0)*w2 + .. + (ak-a0)*wk       */
                /*                                                       */
                /* where k == num_designs-1                              */
                /*                                                       */
                /* I guess that's why it's written in this "compact"     */
                /* form..                                                */
                /*                                                       */
                /*                                                       */
                delta  = top + num_points;
                values = top;
                for ( nn = 0; nn < num_points; nn++ )
                {
                  FT_Int  x = values[0];
                  for ( mm = 1; mm < blend->num_designs; mm++ )
                    x += FT_MulFix( *delta++, blend->weight_vector[mm] );
  
                  *values++ = x;
                }
                /* note that "top" will be incremented later by calls to "pop" */
                break;
              }
            
            default:
            Unexpected_OtherSubr:
              FT_ERROR(( "T1.Parse_CharStrings: invalid othersubr [%d %d]!!\n",
                         top[0], top[1] ));
              goto Syntax_Error;
          }
          decoder->top = top;
        }
        else  /* general operator */
        {
          FT_Int  num_args = t1_args_count[op];
  
          if ( top - decoder->stack < num_args )
            goto Stack_Underflow;
  
          top -= num_args;
  
          switch (op)
          {
            case op_endchar: /*************************************************/
            {
              FT_TRACE4(( " endchar" ));
              close_contour( builder );
  
              /* add current outline to the glyph slot */
              FT_GlyphLoader_Add( builder->loader );
  
              /* return now !! */
              FT_TRACE4(( "\n\n" ));
              return T1_Err_Ok;
            }
  
  
            case op_hsbw: /****************************************************/
            {
              FT_TRACE4(( " hsbw" ));
              builder->left_bearing.x += top[0];
              builder->advance.x       = top[1];
              builder->advance.y       = 0;
  
              builder->last.x = x = top[0];
              builder->last.y = y = 0;
  
              /* the "metrics_only" indicates that we only want to compute */
              /* the glyph's metrics (lsb + advance width), not load the   */
              /* rest of it.. so exit immediately                          */
              if (builder->metrics_only)
                return T1_Err_Ok;
  
              break;
            }
  
  
            case op_seac: /****************************************************/
              /* return immediately after the processing */
              return t1operator_seac( decoder, top[0], top[1],
                                               top[2], top[3], top[4] );
  
            case op_sbw:  /****************************************************/
            {
              FT_TRACE4(( " sbw" ));
              builder->left_bearing.x += top[0];
              builder->left_bearing.y += top[1];
              builder->advance.x       = top[2];
              builder->advance.y       = top[3];
  
              builder->last.x = x = top[0];
              builder->last.y = y = top[1];
  
              /* the "metrics_only" indicates that we only want to compute */
              /* the glyph's metrics (lsb + advance width), not load the   */
              /* rest of it.. so exit immediately                          */
              if (builder->metrics_only)
                return T1_Err_Ok;
  
              break;
            }
  
  
            case op_closepath:  /**********************************************/
            {
              FT_TRACE4(( " closepath" ));
              close_contour( builder );
              builder->path_begun = 0;
            }
            break;
  
  
            case op_hlineto:  /************************************************/
            {
              FT_TRACE4(( " hlineto" ));
              if ( start_point( builder, x, y ) ) goto Memory_Error;
  
              x += top[0];
              goto Add_Line;
            }
  
  
            case op_hmoveto:  /************************************************/
            {
              FT_TRACE4(( " hmoveto" ));
              x += top[0];
              break;
            }
  
  
            case op_hvcurveto:  /**********************************************/
            {
              FT_TRACE4(( " hvcurveto" ));
              if ( start_point( builder, x, y ) ||
                   check_points( builder, 3 )   ) goto Memory_Error;
  
              x += top[0];
              add_point( builder, x, y, 0 );
              x += top[1];
              y += top[2];
              add_point( builder, x, y, 0 );
              y += top[3];
              add_point( builder, x, y, 1 );
              break;
            }
  
  
            case op_rlineto: /*************************************************/
            {
              FT_TRACE4(( " rlineto" ));
              if ( start_point( builder, x, y ) ) goto Memory_Error;
  
              x += top[0];
              y += top[1];
     Add_Line:
              if (add_point1( builder, x, y )) goto Memory_Error;
              break;
            }
  
  
            case op_rmoveto: /*************************************************/
            {
              FT_TRACE4(( " rmoveto" ));
              x += top[0];
              y += top[1];
              break;
            }
  
            case op_rrcurveto: /***********************************************/
            {
              FT_TRACE4(( " rcurveto" ));
              if ( start_point( builder, x, y ) ||
                   check_points( builder, 3 )   ) goto Memory_Error;
  
              x += top[0];
              y += top[1];
              add_point( builder, x, y, 0 );
  
              x += top[2];
              y += top[3];
              add_point( builder, x, y, 0 );
  
              x += top[4];
              y += top[5];
              add_point( builder, x, y, 1 );
              break;
            }
  
  
            case op_vhcurveto:  /**********************************************/
            {
              FT_TRACE4(( " vhcurveto" ));
              if ( start_point( builder, x, y ) ||
                   check_points( builder, 3 )   ) goto Memory_Error;
  
              y += top[0];
              add_point( builder, x, y, 0 );
              x += top[1];
              y += top[2];
              add_point( builder, x, y, 0 );
              x += top[3];
              add_point( builder, x, y, 1 );
              break;
            }
  
  
            case op_vlineto:  /************************************************/
              {
                FT_TRACE4(( " vlineto" ));
                if ( start_point( builder, x, y ) ) goto Memory_Error;
  
                y += top[0];
                goto Add_Line;
              }
  
  
            case op_vmoveto:  /************************************************/
              {
                FT_TRACE4(( " vmoveto" ));
                y += top[0];
                break;
              }
  
  
            case op_div:  /****************************************************/
            {
              FT_TRACE4(( " div" ));
              if (top[1])
              {
                *top = top[0] / top[1];
                ++top;
              }
              else
              {
                FT_ERROR(( "T1.Parse_CharStrings : division by 0\n" ));
                goto Syntax_Error;
              }
              break;
            }
  
  
            case op_callsubr:  /***********************************************/
            {
              FT_Int  index;
  
              FT_TRACE4(( " callsubr" ));
              index = top[0];
              if ( index < 0 || index >= num_subrs )
              {
                FT_ERROR(( "T1.Parse_CharStrings : invalid subrs index\n" ));
                goto Syntax_Error;
              }
  
              if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS )
              {
                FT_ERROR(( "T1.Parse_CharStrings : too many nested subrs\n" ));
                goto Syntax_Error;
              }
  
              zone->cursor = ip;  /* save current instruction pointer */
  
              zone++;
              zone->base    = subrs_base[index];
              zone->limit   = zone->base + subrs_len[index];
              zone->cursor  = zone->base;
  
              if (!zone->base)
              {
                FT_ERROR(( "T1.Parse_CharStrings : invoking empty subrs !!\n" ));
                goto Syntax_Error;
              }
  
              decoder->zone = zone;
              ip            = zone->base;
              limit         = zone->limit;
              break;
            }
  
  
            case op_pop:  /****************************************************/
            {
              FT_TRACE4(( " pop" ));
              /* theorically, the arguments are already on the stack */
              top++;
              break;
            }
  
  
            case op_return:  /************************************************/
            {
              FT_TRACE4(( " return" ));
              if ( zone <= decoder->zones )
              {
                FT_ERROR(( "T1.Parse_CharStrings : unexpected return\n" ));
                goto Syntax_Error;
              }
  
              zone--;
              ip            = zone->cursor;
              limit         = zone->limit;
              decoder->zone = zone;
              break;
            }
  
            case op_dotsection:  /*********************************************/
            {
              FT_TRACE4(( " dotsection" ));
              break;
            }
  
            case op_hstem:  /**************************************************/
            {
              FT_TRACE4(( " hstem" ));
              break;
            }
  
            case op_hstem3:  /*************************************************/
            {
              FT_TRACE4(( " hstem3" ));
              break;
            }
  
            case op_vstem:  /**************************************************/
            {
              FT_TRACE4(( " vstem" ));
              break;
            }
  
            case op_vstem3:  /*************************************************/
            {
              FT_TRACE4(( " vstem3" ));
              break;
            }
  
            case op_setcurrentpoint:  /*****************************************/
            {
              FT_TRACE4(( " setcurrentpoint" ));
              FT_ERROR(( "T1.Parse_CharStrings : unexpected SETCURRENTPOINT\n" ));
              goto Syntax_Error;
            }
  
            default:
              FT_ERROR(( "T1.Parse_CharStrings : unhandled opcode %d\n", op ));
              goto Syntax_Error;
          }
  
          decoder->top = top;
  
        } /* general operator processing */
  
  
      } /* while ip < limit */
      FT_TRACE4(( "..end..\n\n" ));
      return error;
  
    Syntax_Error:
      return T1_Err_Syntax_Error;
  
    Stack_Underflow:
      return T1_Err_Stack_Underflow;
  
    Memory_Error:
      return builder->error;
    }
  
  
  
    /**********************************************************************/
    /**********************************************************************/
    /**********************************************************************/
    /**********                                                   *********/
    /**********                                                   *********/
    /**********           COMPUTE THE MAXIMUM ADVANCE WIDTH       *********/
    /**********                                                   *********/
    /**********   The following code is in charge of computing    *********/
    /**********   the maximum advance width of the font. It       *********/
    /**********   quickly process each glyph charstring to        *********/
    /**********   extract the value from either a "sbw" or "seac" *********/
    /**********   operator.                                       *********/
    /**********                                                   *********/
    /**********************************************************************/
    /**********************************************************************/
    /**********************************************************************/
  
    LOCAL_FUNC
    FT_Error  Z1_Compute_Max_Advance( T1_Face  face,
                                      FT_Int  *max_advance )
    {
      FT_Error    error;
      Z1_Decoder  decoder;
      FT_Int      glyph_index;
      T1_Font*    type1 = &face->type1;
  
      *max_advance = 0;
  
      /* Initialise load decoder */
      Z1_Init_Decoder( &decoder );
      Z1_Init_Builder( &decoder.builder, face, 0, 0 );
  
      decoder.blend                = face->blend;
      decoder.builder.metrics_only = 1;
      decoder.builder.load_points  = 0;
  
      /* For each glyph, parse the glyph charstring and extract */
      /* the advance width..                                    */
      for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
      {
        /* now get load the unscaled outline */
        error = Z1_Parse_CharStrings( &decoder,
                                      type1->charstrings    [glyph_index],
                                      type1->charstrings_len[glyph_index],
                                      type1->num_subrs,
                                      type1->subrs,
                                      type1->subrs_len );
        /* ignore the error if one occured - skip to next glyph */
      }
  
      *max_advance = decoder.builder.advance.x;
      return T1_Err_Ok;
    }
  
  
    /**********************************************************************/
    /**********************************************************************/
    /**********************************************************************/
    /**********                                                   *********/
    /**********                                                   *********/
    /**********              UNHINTED GLYPH LOADER                *********/
    /**********                                                   *********/
    /**********   The following code is in charge of loading a    *********/
    /**********   single outline. It completely ignores hinting   *********/
    /**********   and is used when FT_LOAD_NO_HINTING is set.     *********/
    /**********                                                   *********/
    /**********************************************************************/
    /**********************************************************************/
    /**********************************************************************/
  
  
    LOCAL_FUNC
    FT_Error  Z1_Load_Glyph( Z1_GlyphSlot  glyph,
                             Z1_Size       size,
                             FT_Int        glyph_index,
                             FT_Int        load_flags )
    {
      FT_Error        error;
      Z1_Decoder      decoder;
      T1_Face         face = (T1_Face)glyph->root.face;
      FT_Bool         hinting;
      T1_Font*        type1 = &face->type1;
  
      if (load_flags & FT_LOAD_NO_RECURSE)
        load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
  
      glyph->x_scale = size->root.metrics.x_scale;
      glyph->y_scale = size->root.metrics.y_scale;
  
      glyph->root.outline.n_points   = 0;
      glyph->root.outline.n_contours = 0;
  
      hinting = ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
                ( load_flags & FT_LOAD_NO_HINTING ) == 0;
  
      glyph->root.format = ft_glyph_format_outline;
  
      {
        Z1_Init_Decoder( &decoder );
        Z1_Init_Builder( &decoder.builder, face, size, glyph );
  
        decoder.blend              = ((T1_Face)glyph->root.face)->blend;
        decoder.builder.no_recurse = (FT_Bool)!!(load_flags & FT_LOAD_NO_RECURSE);
  
        /* now load the unscaled outline */
        error = Z1_Parse_CharStrings( &decoder,
                                      type1->charstrings    [glyph_index],
                                      type1->charstrings_len[glyph_index],
                                      type1->num_subrs,
                                      type1->subrs,
                                      type1->subrs_len );
  
        /* save new glyph tables */
        Z1_Done_Builder( &decoder.builder );
      }
  
      /* Now, set the metrics.. - this is rather simple, as : */
      /* the left side bearing is the xMin, and the top side  */
      /* bearing the yMax..                                   */
      if (!error)
      {
        /* for composite glyphs, return only the left side bearing and the */
        /* advance width..                                                 */
        if ( load_flags & FT_LOAD_NO_RECURSE )
        {
          glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
          glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;
        }
        else
        {
          FT_BBox           cbox;
          FT_Glyph_Metrics* metrics = &glyph->root.metrics;
  
          /* copy the _unscaled_ advance width */
          metrics->horiAdvance  = decoder.builder.advance.x;
  
          /* make up vertical metrics */
          metrics->vertBearingX = 0;
          metrics->vertBearingY = 0;
          metrics->vertAdvance  = 0;
  
          glyph->root.format = ft_glyph_format_outline;
  
          glyph->root.outline.flags &= ft_outline_owner;
          if ( size && size->root.metrics.y_ppem < 24 )
            glyph->root.outline.flags |= ft_outline_high_precision;
  
          glyph->root.outline.flags |= ft_outline_reverse_fill;
  
          /*
          glyph->root.outline.second_pass    = TRUE;
          glyph->root.outline.high_precision = ( size->root.metrics.y_ppem < 24 );
          glyph->root.outline.dropout_mode   = 2;
          */
  
          if ( (load_flags & FT_LOAD_NO_SCALE) == 0 )
          {
            /* scale the outline and the metrics */
            FT_Int       n;
            FT_Outline*  cur = decoder.builder.base;
            FT_Vector*   vec = cur->points;
            FT_Fixed     x_scale = glyph->x_scale;
            FT_Fixed     y_scale = glyph->y_scale;
  
            /* First of all, scale the points */
            for ( n = cur->n_points; n > 0; n--, vec++ )
            {
              vec->x = FT_MulFix( vec->x, x_scale );
              vec->y = FT_MulFix( vec->y, y_scale );
            }
  
            FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
  
            /* Then scale the metrics */
            metrics->horiAdvance  = FT_MulFix( metrics->horiAdvance,  x_scale );
            metrics->vertAdvance  = FT_MulFix( metrics->vertAdvance,  y_scale );
  
            metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
            metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
          }
  
          /* apply the font matrix */
          FT_Outline_Transform( &glyph->root.outline, &face->type1.font_matrix );
  
          /* compute the other metrics */
          FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
  
          /* grid fit the bounding box if necessary */
          if (hinting)
          {
            cbox.xMin &= -64;
            cbox.yMin &= -64;
            cbox.xMax = ( cbox.xMax+63 ) & -64;
            cbox.yMax = ( cbox.yMax+63 ) & -64;
          }
  
          metrics->width  = cbox.xMax - cbox.xMin;
          metrics->height = cbox.yMax - cbox.yMin;
  
          metrics->horiBearingX = cbox.xMin;
          metrics->horiBearingY = cbox.yMax;
        }
      }
      return error;
    }
  
  

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