kc3-lang/freetype/src/psaux/t1decode.c

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• Hash : d15bc0d1
  Author :
  Date : 2002-04-12T09:31:48
  

  * README.UNX: updated the Unix-specific quick-compilation guide to warn about the GNU Make requirement at compile time.. * include/freetype/config/ftstdlib.h, include/freetype/config/ftconfig.h, include/freetype/config/ftheader.h, include/freetype/internal/ftmemory.h, include/freetype/internal/ftobjs.h, src/autohint/ahoptim.c, src/base/ftdbgmem.c, src/base/ftdebug.c, src/base/ftmac.c, src/base/ftobjs.c, src/base/ftsystem.c, src/cache/ftcimage.c, src/cache/ftcsbits.c, src/cff/cffdriver.c, src/cff/cffload.c, src/cff/cffobjs.c, src/cid/cidload.c, src/cid/cidparse.c, src/cid/cidriver.c, src/pcf/pcfdriver.c, src/pcf/pcfread.c, src/psaux/t1cmap.c, src/psaux/t1decode.c, src/pshinter/pshalgo1.c, src/pshinter/pshalgo2.c, src/pshinter/pshrec.c, src/psnames/psmodule.c, src/raster/ftraster.c, src/sfnt/sfdriver.c, src/sfnt/ttload.c, src/sfnt/ttpost.c, src/smooth/ftgrays.c, src/type1/t1afm.c, src/type1/t1driver.c, src/type1/t1gload.c, src/type1/t1load.c, src/type1/t1objs.c, src/type1/t1parse.c: added the new configuration file "ftstdlib.h" used to define aliases for all ISO C library functions used by the engine (e.g. strlen, qsort, setjmp, etc...) this eases the porting of FreeType 2 to exotic environments like XFree86 modules/extensions.. also removed many #include <string.h>, #include <stdlib.h>, etc... from the engine's sources where they're not needed..

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• src/psaux/t1decode.c

• /***************************************************************************/
  /*                                                                         */
  /*  t1decode.c                                                             */
  /*                                                                         */
  /*    PostScript Type 1 decoding routines (body).                          */
  /*                                                                         */
  /*  Copyright 2000-2001, 2002 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 <ft2build.h>
  #include FT_INTERNAL_DEBUG_H
  #include FT_INTERNAL_POSTSCRIPT_HINTS_H
  #include FT_OUTLINE_H
  
  #include "t1decode.h"
  #include "psobjs.h"
  
  #include "psauxerr.h"
  
  
    /*************************************************************************/
    /*                                                                       */
    /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
    /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
    /* messages during execution.                                            */
    /*                                                                       */
  #undef  FT_COMPONENT
  #define FT_COMPONENT  trace_t1decode
  
  
    typedef enum  T1_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 */
  
    } T1_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 */
    };
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    t1_lookup_glyph_by_stdcharcode                                     */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Looks up a given glyph by its StandardEncoding charcode.  Used to  */
    /*    implement the SEAC Type 1 operator.                                */
    /*                                                                       */
    /* <Input>                                                               */
    /*    face     :: The current face object.                               */
    /*                                                                       */
    /*    charcode :: The character code to look for.                        */
    /*                                                                       */
    /* <Return>                                                              */
    /*    A glyph index in the font face.  Returns -1 if the corresponding   */
    /*    glyph wasn't found.                                                */
    /*                                                                       */
    static FT_Int
    t1_lookup_glyph_by_stdcharcode( T1_Decoder  decoder,
                                    FT_Int      charcode )
    {
      FT_UInt           n;
      const FT_String*  glyph_name;
      PSNames_Service   psnames = decoder->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 < decoder->num_glyphs; n++ )
      {
        FT_String*  name = (FT_String*)decoder->glyph_names[n];
  
  
        if ( name && name[0] == glyph_name[0] &&
             ft_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 :: The current CID decoder.                                */
    /*                                                                       */
    /*    asb     :: The accent's side bearing.                              */
    /*                                                                       */
    /*    adx     :: The horizontal offset of the accent.                    */
    /*                                                                       */
    /*    ady     :: The vertical offset of the accent.                      */
    /*                                                                       */
    /*    bchar   :: The base character's StandardEncoding charcode.         */
    /*                                                                       */
    /*    achar   :: The accent character's StandardEncoding charcode.       */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0 means success.                             */
    /*                                                                       */
    static FT_Error
    t1operator_seac( T1_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;
  #if 0
      FT_Int       n_base_points;
      FT_Outline*  base = decoder->builder.base;
  #endif
      FT_Vector    left_bearing, advance;
  
  
      /* seac weirdness */
      adx += decoder->builder.left_bearing.x;
  
      /* `glyph_names' is set to 0 for CID fonts which do not */
      /* include an encoding.  How can we deal with these?    */
      if ( decoder->glyph_names == 0 )
      {
        FT_ERROR(( "t1operator_seac:" ));
        FT_ERROR(( " glyph names table not available in this font!\n" ));
        return PSaux_Err_Syntax_Error;
      }
  
      bchar_index = t1_lookup_glyph_by_stdcharcode( decoder, bchar );
      achar_index = t1_lookup_glyph_by_stdcharcode( decoder, achar );
  
      if ( bchar_index < 0 || achar_index < 0 )
      {
        FT_ERROR(( "t1operator_seac:" ));
        FT_ERROR(( " invalid seac character code arguments\n" ));
        return PSaux_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->internal->loader;
        FT_SubGlyph     subg;
  
  
        /* reallocate subglyph array if necessary */
        error = FT_GlyphLoader_CheckSubGlyphs( 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;
        goto Exit;
      }
  
      /* First load `bchar' in builder */
      /* now load the unscaled outline */
  
      FT_GlyphLoader_Prepare( decoder->builder.loader );  /* prepare loader */
  
      error = T1_Decoder_Parse_Glyph( decoder, bchar_index );
      if ( error )
        goto Exit;
  
  #if 0
      n_base_points = base->n_points;
  #endif
  
      /* 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;
  
      decoder->builder.pos_x = adx - asb;
      decoder->builder.pos_y = ady;
  
      /* Now load `achar' on top of */
      /* the base outline           */
      error = T1_Decoder_Parse_Glyph( decoder, achar_index );
      if ( error )
        goto Exit;
  
      /* restore the left side bearing and   */
      /* advance width of the base character */
  
      decoder->builder.left_bearing = left_bearing;
      decoder->builder.advance      = advance;
  
      /* XXX: old code doesn't work with PostScript hinter */
  #if 0
      /* Finally, move the accent */
      if ( decoder->builder.load_points )
      {
        FT_Outline  dummy;
  
  
        dummy.n_points = (short)( base->n_points - n_base_points );
        dummy.points   = base->points + n_base_points;
  
        FT_Outline_Translate( &dummy, adx - asb, ady );
      }
  #else
      decoder->builder.pos_x = 0;
      decoder->builder.pos_y = 0;
  #endif
  
    Exit:
      return error;
    }
  
  
    /*************************************************************************/
    /*                                                                       */
    /* <Function>                                                            */
    /*    T1_Decoder_Parse_Charstrings                                       */
    /*                                                                       */
    /* <Description>                                                         */
    /*    Parses a given Type 1 charstrings program.                         */
    /*                                                                       */
    /* <Input>                                                               */
    /*    decoder         :: The current Type 1 decoder.                     */
    /*                                                                       */
    /*    charstring_base :: The base address of the charstring stream.      */
    /*                                                                       */
    /*    charstring_len  :: The length in bytes of the charstring stream.   */
    /*                                                                       */
    /* <Return>                                                              */
    /*    FreeType error code.  0 means success.                             */
    /*                                                                       */
    FT_LOCAL_DEF( FT_Error )
    T1_Decoder_Parse_Charstrings( T1_Decoder  decoder,
                                  FT_Byte*    charstring_base,
                                  FT_UInt     charstring_len )
    {
      FT_Error         error;
      T1_Decoder_Zone  zone;
      FT_Byte*         ip;
      FT_Byte*         limit;
      T1_Builder       builder = &decoder->builder;
      FT_Pos           x, y, orig_x, orig_y;
  
      T1_Hints_Funcs   hinter;
  
  
      /* we don't want to touch the source code -- use macro trick */
  #define start_point    T1_Builder_Start_Point
  #define check_points   T1_Builder_Check_Points
  #define add_point      T1_Builder_Add_Point
  #define add_point1     T1_Builder_Add_Point1
  #define add_contour    T1_Builder_Add_Contour
  #define close_contour  T1_Builder_Close_Contour
  
      /* First of all, initialize the decoder */
      decoder->top  = decoder->stack;
      decoder->zone = decoder->zones;
      zone          = decoder->zones;
  
      builder->path_begun  = 0;
  
      hinter = (T1_Hints_Funcs)builder->hints_funcs;
  
      zone->base           = charstring_base;
      limit = zone->limit  = charstring_base + charstring_len;
      ip    = zone->cursor = zone->base;
  
      error = PSaux_Err_Ok;
  
      x = orig_x = builder->pos_x;
      y = orig_y = builder->pos_y;
  
      /* begin hints recording session, if any */
      if ( hinter )
        hinter->open( hinter->hints );
  
      /* now, execute loop */
      while ( ip < limit )
      {
        FT_Long*     top   = decoder->top;
        T1_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_Decoder_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_Decoder_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_Decoder_Parse_Charstrings: "
                       "unexpected EOF in integer\n" ));
            goto Syntax_Error;
          }
  
          value = (FT_Int32)( ((FT_Long)ip[0] << 24) |
                              ((FT_Long)ip[1] << 16) |
                              ((FT_Long)ip[2] << 8 ) |
                                        ip[3] );
          ip += 4;
          break;
  
        default:
          if ( ip[-1] >= 32 )
          {
            if ( ip[-1] < 247 )
              value = (FT_Long)ip[-1] - 139;
            else
            {
              if ( ++ip > limit )
              {
                FT_ERROR(( "T1_Decoder_Parse_Charstrings: " ));
                FT_ERROR(( "unexpected EOF in integer\n" ));
                goto Syntax_Error;
              }
  
              if ( ip[-2] < 251 )
                value =  ( ( (FT_Long)ip[-2] - 247 ) << 8 ) + ip[-1] + 108;
              else
                value = -( ( ( (FT_Long)ip[-2] - 251 ) << 8 ) + ip[-1] + 108 );
            }
          }
          else
          {
            FT_ERROR(( "T1_Decoder_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_Decoder_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  idx;
  
  
              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    */
              idx = decoder->num_flex_vectors++;
              if ( idx > 0 && idx < 7 )
                add_point( builder,
                           x,
                           y,
                           (FT_Byte)( idx == 3 || idx == 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_Decoder_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_Decoder_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_Decoder_Parse_Charstrings: "
                         "invalid escape (12+%d)\n", ip[-1] ));
              goto Syntax_Error;
            }
  
            if ( ip[0] != 12 || ip[1] != 17 )
            {
              FT_ERROR(( "T1_Decoder_Parse_Charstrings: " ));
              FT_ERROR(( "`pop' expected, found (%d %d)\n", ip[0], ip[1] ));
              goto Syntax_Error;
            }
            ip += 2;
  
            if ( hinter )
              hinter->reset( hinter->hints, builder->current->n_points );
  
            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 */
            {
              PS_Blend  blend = decoder->blend;
              FT_UInt   num_points, nn, mm;
              FT_Long*  delta;
              FT_Long*  values;
  
  
              if ( !blend )
              {
                FT_ERROR(( "T1_Decoder_Parse_Charstrings: " ));
                FT_ERROR(( "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_Decoder_Parse_Charstrings: " ));
                FT_ERROR(( "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  tmp = values[0];
  
  
                for ( mm = 1; mm < blend->num_designs; mm++ )
                  tmp += FT_MulFix( *delta++, blend->weight_vector[mm] );
  
                *values++ = tmp;
              }
              /* note that `top' will be incremented later by calls to `pop' */
              break;
            }
  
          default:
          Unexpected_OtherSubr:
            FT_ERROR(( "T1_Decoder_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 );
  
            /* close hints recording session */
            if ( hinter )
            {
              if (hinter->close( hinter->hints, builder->current->n_points ))
                goto Syntax_Error;
  
              /* apply hints to the loaded glyph outline now */
              hinter->apply( hinter->hints,
                             builder->current,
                             (PSH_Globals)builder->hints_globals );
            }
  
            /* add current outline to the glyph slot */
            FT_GlyphLoader_Add( builder->loader );
  
            /* return now! */
            FT_TRACE4(( "\n\n" ));
            return PSaux_Err_Ok;
  
          case op_hsbw:
            FT_TRACE4(( " hsbw" ));
  
            builder->left_bearing.x += top[0];
            builder->advance.x       = top[1];
            builder->advance.y       = 0;
  
            orig_x = builder->last.x = x = builder->pos_x + top[0];
            orig_y = builder->last.y = y = builder->pos_y;
  
            FT_UNUSED( orig_y );
  
            /* 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 PSaux_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 = builder->pos_x + top[0];
            builder->last.y = y = builder->pos_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 PSaux_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];
            if ( !decoder->flex_state )
              builder->path_begun = 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];
            if ( !decoder->flex_state )
              builder->path_begun = 0;
            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];
            if ( !decoder->flex_state )
              builder->path_begun = 0;
            break;
  
          case op_div:
            FT_TRACE4(( " div" ));
  
            if ( top[1] )
            {
              *top = top[0] / top[1];
              ++top;
            }
            else
            {
              FT_ERROR(( "T1_Decoder_Parse_Charstrings: division by 0\n" ));
              goto Syntax_Error;
            }
            break;
  
          case op_callsubr:
            {
              FT_Int  idx;
  
  
              FT_TRACE4(( " callsubr" ));
  
              idx = top[0];
              if ( idx < 0 || idx >= (FT_Int)decoder->num_subrs )
              {
                FT_ERROR(( "T1_Decoder_Parse_Charstrings: "
                           "invalid subrs index\n" ));
                goto Syntax_Error;
              }
  
              if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS )
              {
                FT_ERROR(( "T1_Decoder_Parse_Charstrings: "
                           "too many nested subrs\n" ));
                goto Syntax_Error;
              }
  
              zone->cursor = ip;  /* save current instruction pointer */
  
              zone++;
  
              /* The Type 1 driver stores subroutines without the seed bytes. */
              /* The CID driver stores subroutines with seed bytes.  This     */
              /* case is taken care of when decoder->subrs_len == 0.          */
              zone->base = decoder->subrs[idx];
  
              if ( decoder->subrs_len )
                zone->limit = zone->base + decoder->subrs_len[idx];
              else
              {
                /* We are using subroutines from a CID font.  We must adjust */
                /* for the seed bytes.                                       */
                zone->base  += ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
                zone->limit  = decoder->subrs[idx + 1];
              }
  
              zone->cursor = zone->base;
  
              if ( !zone->base )
              {
                FT_ERROR(( "T1_Decoder_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" ));
  
            /* theoretically, the arguments are already on the stack */
            top++;
            break;
  
          case op_return:
            FT_TRACE4(( " return" ));
  
            if ( zone <= decoder->zones )
            {
              FT_ERROR(( "T1_Decoder_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" ));
  
            /* record horizontal hint */
            if ( hinter )
            {
              /* top[0] += builder->left_bearing.y; */
              hinter->stem( hinter->hints, 1, top );
            }
  
            break;
  
          case op_hstem3:
            FT_TRACE4(( " hstem3" ));
  
            /* record horizontal counter-controlled hints */
            if ( hinter )
              hinter->stem3( hinter->hints, 1, top );
  
            break;
  
          case op_vstem:
            FT_TRACE4(( " vstem" ));
  
            /* record vertical  hint */
            if ( hinter )
            {
              top[0] += orig_x;
              hinter->stem( hinter->hints, 0, top );
            }
  
            break;
  
          case op_vstem3:
            FT_TRACE4(( " vstem3" ));
  
            /* record vertical counter-controlled hints */
            if ( hinter )
            {
              FT_Pos  dx = orig_x;
  
  
              top[0] += dx;
              top[2] += dx;
              top[4] += dx;
              hinter->stem3( hinter->hints, 0, top );
            }
            break;
  
          case op_setcurrentpoint:
            FT_TRACE4(( " setcurrentpoint" ));
  
            FT_ERROR(( "T1_Decoder_Parse_Charstrings: " ));
            FT_ERROR(( "unexpected `setcurrentpoint'\n" ));
            goto Syntax_Error;
  
          default:
            FT_ERROR(( "T1_Decoder_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 PSaux_Err_Syntax_Error;
  
    Stack_Underflow:
      return PSaux_Err_Stack_Underflow;
  
    Memory_Error:
      return builder->error;
    }
  
  
    /* parse a single Type 1 glyph */
    FT_LOCAL_DEF( FT_Error )
    T1_Decoder_Parse_Glyph( T1_Decoder  decoder,
                            FT_UInt     glyph )
    {
      return decoder->parse_callback( decoder, glyph );
    }
  
  
    /* initialize T1 decoder */
    FT_LOCAL_DEF( FT_Error )
    T1_Decoder_Init( T1_Decoder           decoder,
                     FT_Face              face,
                     FT_Size              size,
                     FT_GlyphSlot         slot,
                     FT_Byte**            glyph_names,
                     PS_Blend             blend,
                     FT_Bool              hinting,
                     T1_Decoder_Callback  parse_callback )
    {
      FT_MEM_SET( decoder, 0, sizeof ( *decoder ) );
  
      /* retrieve PSNames interface from list of current modules */
      {
        PSNames_Service  psnames = 0;
  
  
        psnames = (PSNames_Service)FT_Get_Module_Interface(
                    FT_FACE_LIBRARY(face), "psnames" );
        if ( !psnames )
        {
          FT_ERROR(( "T1_Decoder_Init: " ));
          FT_ERROR(( "the `psnames' module is not available\n" ));
          return PSaux_Err_Unimplemented_Feature;
        }
  
        decoder->psnames = psnames;
      }
  
      T1_Builder_Init( &decoder->builder, face, size, slot, hinting );
  
      decoder->num_glyphs     = face->num_glyphs;
      decoder->glyph_names    = glyph_names;
      decoder->blend          = blend;
      decoder->parse_callback = parse_callback;
  
      decoder->funcs          = t1_decoder_funcs;
  
      return 0;
    }
  
  
    /* finalize T1 decoder */
    FT_LOCAL_DEF( void )
    T1_Decoder_Done( T1_Decoder  decoder )
    {
      T1_Builder_Done( &decoder->builder );
    }
  
  
  /* END */
  

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