t1load.c

奇趣公司比较新的qt/emd版本

    if ( !blend || !blend->num_designs )
    {
      error = t1_allocate_blend( face, num_designs, 0 );
      if ( error )
        goto Exit;
      blend = face->blend;
    }
    else if ( blend->num_designs != (FT_UInt)num_designs )
    {
      FT_ERROR(( "parse_weight_vector:"
                 " /BlendDesignPosition and /WeightVector have\n" ));
      FT_ERROR(( "                    "
                 " different number of elements!\n" ));
      error = T1_Err_Invalid_File_Format;
      goto Exit;
    }

    old_cursor = parser->root.cursor;
    old_limit  = parser->root.limit;

    for ( n = 0; n < num_designs; n++ )
    {
      token = design_tokens + n;
      parser->root.cursor = token->start;
      parser->root.limit  = token->limit;

      blend->default_weight_vector[n] =
      blend->weight_vector[n]         = T1_ToFixed( parser, 0 );
    }

    parser->root.cursor = old_cursor;
    parser->root.limit  = old_limit;

  Exit:
    parser->root.error = error;
  }


  /* e.g., /BuildCharArray [0 0 0 0 0 0 0 0] def           */
  /* we're only interested in the number of array elements */
  static void
  parse_buildchar( T1_Face    face,
                   T1_Loader  loader )
  {
    face->len_buildchar = T1_ToFixedArray( &loader->parser, 0, NULL, 0 );

    return;
  }


#endif /* T1_CONFIG_OPTION_NO_MM_SUPPORT */




  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                      TYPE 1 SYMBOL PARSING                    *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  static FT_Error
  t1_load_keyword( T1_Face         face,
                   T1_Loader       loader,
                   const T1_Field  field )
  {
    FT_Error  error;
    void*     dummy_object;
    void**    objects;
    FT_UInt   max_objects;
    PS_Blend  blend = face->blend;


    /* if the keyword has a dedicated callback, call it */
    if ( field->type == T1_FIELD_TYPE_CALLBACK )
    {
      field->reader( (FT_Face)face, loader );
      error = loader->parser.root.error;
      goto Exit;
    }

    /* now, the keyword is either a simple field, or a table of fields; */
    /* we are now going to take care of it                              */
    switch ( field->location )
    {
    case T1_FIELD_LOCATION_FONT_INFO:
      dummy_object = &face->type1.font_info;
      objects      = &dummy_object;
      max_objects  = 0;

      if ( blend )
      {
        objects     = (void**)blend->font_infos;
        max_objects = blend->num_designs;
      }
      break;

    case T1_FIELD_LOCATION_PRIVATE:
      dummy_object = &face->type1.private_dict;
      objects      = &dummy_object;
      max_objects  = 0;

      if ( blend )
      {
        objects     = (void**)blend->privates;
        max_objects = blend->num_designs;
      }
      break;

    case T1_FIELD_LOCATION_BBOX:
      dummy_object = &face->type1.font_bbox;
      objects      = &dummy_object;
      max_objects  = 0;

      if ( blend )
      {
        objects     = (void**)blend->bboxes;
        max_objects = blend->num_designs;
      }
      break;

    case T1_FIELD_LOCATION_LOADER:
      dummy_object = loader;
      objects      = &dummy_object;
      max_objects  = 0;
      break;

    case T1_FIELD_LOCATION_FACE:
      dummy_object = face;
      objects      = &dummy_object;
      max_objects  = 0;
      break;

#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT
    case T1_FIELD_LOCATION_BLEND:
      dummy_object = face->blend;
      objects      = &dummy_object;
      max_objects  = 0;
      break;
#endif

    default:
      dummy_object = &face->type1;
      objects      = &dummy_object;
      max_objects  = 0;
    }

    if ( field->type == T1_FIELD_TYPE_INTEGER_ARRAY ||
         field->type == T1_FIELD_TYPE_FIXED_ARRAY   )
      error = T1_Load_Field_Table( &loader->parser, field,
                                   objects, max_objects, 0 );
    else
      error = T1_Load_Field( &loader->parser, field,
                             objects, max_objects, 0 );

  Exit:
    return error;
  }


  static void
  parse_private( T1_Face    face,
                 T1_Loader  loader )
  {
    FT_UNUSED( face );

    loader->keywords_encountered |= T1_PRIVATE;
  }


  static int
  read_binary_data( T1_Parser  parser,
                    FT_Long*   size,
                    FT_Byte**  base )
  {
    FT_Byte*  cur;
    FT_Byte*  limit = parser->root.limit;


    /* the binary data has one of the following formats */
    /*                                                  */
    /*   `size' [white*] RD white ....... ND            */
    /*   `size' [white*] -| white ....... |-            */
    /*                                                  */

    T1_Skip_Spaces( parser );

    cur = parser->root.cursor;

    if ( cur < limit && ft_isdigit( *cur ) )
    {
      *size = T1_ToInt( parser );

      T1_Skip_PS_Token( parser );   /* `RD' or `-|' or something else */

      /* there is only one whitespace char after the */
      /* `RD' or `-|' token                          */
      *base = parser->root.cursor + 1;

      parser->root.cursor += *size + 1;
      return !parser->root.error;
    }

    FT_ERROR(( "read_binary_data: invalid size field\n" ));
    parser->root.error = T1_Err_Invalid_File_Format;
    return 0;
  }


  /* We now define the routines to handle the `/Encoding', `/Subrs', */
  /* and `/CharStrings' dictionaries.                                */

  static void
  parse_font_matrix( T1_Face    face,
                     T1_Loader  loader )
  {
    T1_Parser   parser = &loader->parser;
    FT_Matrix*  matrix = &face->type1.font_matrix;
    FT_Vector*  offset = &face->type1.font_offset;
    FT_Face     root   = (FT_Face)&face->root;
    FT_Fixed    temp[6];
    FT_Fixed    temp_scale;


    (void)T1_ToFixedArray( parser, 6, temp, 3 );

    temp_scale = FT_ABS( temp[3] );

    /* Set Units per EM based on FontMatrix values.  We set the value to */
    /* 1000 / temp_scale, because temp_scale was already multiplied by   */
    /* 1000 (in t1_tofixed, from psobjs.c).                              */

    root->units_per_EM = (FT_UShort)( FT_DivFix( 1000 * 0x10000L,
                                                 temp_scale ) >> 16 );

    /* we need to scale the values by 1.0/temp_scale */
    if ( temp_scale != 0x10000L )
    {
      temp[0] = FT_DivFix( temp[0], temp_scale );
      temp[1] = FT_DivFix( temp[1], temp_scale );
      temp[2] = FT_DivFix( temp[2], temp_scale );
      temp[4] = FT_DivFix( temp[4], temp_scale );
      temp[5] = FT_DivFix( temp[5], temp_scale );
      temp[3] = 0x10000L;
    }

    matrix->xx = temp[0];
    matrix->yx = temp[1];
    matrix->xy = temp[2];
    matrix->yy = temp[3];

    /* note that the offsets must be expressed in integer font units */
    offset->x = temp[4] >> 16;
    offset->y = temp[5] >> 16;
  }


  static void
  parse_encoding( T1_Face    face,
                  T1_Loader  loader )
  {
    T1_Parser  parser = &loader->parser;
    FT_Byte*   cur;
    FT_Byte*   limit  = parser->root.limit;

    PSAux_Service  psaux = (PSAux_Service)face->psaux;


    T1_Skip_Spaces( parser );
    cur = parser->root.cursor;
    if ( cur >= limit )
    {
      FT_ERROR(( "parse_encoding: out of bounds!\n" ));
      parser->root.error = T1_Err_Invalid_File_Format;
      return;
    }

    /* if we have a number or `[', the encoding is an array, */
    /* and we must load it now                               */
    if ( ft_isdigit( *cur ) || *cur == '[' )
    {
      T1_Encoding  encode          = &face->type1.encoding;
      FT_Int       count, n;
      PS_Table     char_table      = &loader->encoding_table;
      FT_Memory    memory          = parser->root.memory;
      FT_Error     error;
      FT_Bool      only_immediates = 0;


      /* read the number of entries in the encoding; should be 256 */
      if ( *cur == '[' )
      {
        count           = 256;
        only_immediates = 1;
        parser->root.cursor++;
      }
      else
        count = (FT_Int)T1_ToInt( parser );

      T1_Skip_Spaces( parser );
      if ( parser->root.cursor >= limit )
        return;

      /* we use a T1_Table to store our charnames */
      loader->num_chars = encode->num_chars = count;
      if ( FT_NEW_ARRAY( encode->char_index, count )     ||
           FT_NEW_ARRAY( encode->char_name,  count )     ||
           FT_SET_ERROR( psaux->ps_table_funcs->init(
                           char_table, count, memory ) ) )
      {
        parser->root.error = error;
        return;
      }

      /* We need to `zero' out encoding_table.elements */
      for ( n = 0; n < count; n++ )
      {
        char*  notdef = (char *)".notdef";


        T1_Add_Table( char_table, n, notdef, 8 );
      }

      /* Now we need to read records of the form                */
      /*                                                        */
      /*   ... charcode /charname ...                           */
      /*                                                        */
      /* for each entry in our table.                           */
      /*                                                        */
      /* We simply look for a number followed by an immediate   */
      /* name.  Note that this ignores correctly the sequence   */
      /* that is often seen in type1 fonts:                     */
      /*                                                        */
      /*   0 1 255 { 1 index exch /.notdef put } for dup        */
      /*                                                        */
      /* used to clean the encoding array before anything else. */
      /*                                                        */
      /* Alternatively, if the array is directly given as       */
      /*                                                        */
      /*   /Encoding [ ... ]                                    */
      /*                                                        */
      /* we only read immediates.                               */

      n = 0;
      T1_Skip_Spaces( parser );

      while ( parser->root.cursor < limit )
      {
        cur = parser->root.cursor;

        /* we stop when we encounter a `def' or `]' */
        if ( *cur == 'd' && cur + 3 < limit )
        {
          if ( cur[1] == 'e'         &&
               cur[2] == 'f'         &&
               IS_PS_DELIM( cur[3] ) )
          {
            FT_TRACE6(( "encoding end\n" ));
            cur += 3;
            break;
          }
        }
        if ( *cur == ']' )
        {
          FT_TRACE6(( "encoding end\n" ));
          cur++;
          break;
        }

        /* check whether we've found an entry */
        if ( ft_isdigit( *cur ) || only_immediates )
        {
          FT_Int  charcode;


          if ( only_immediates )
            charcode = n;
          else
          {
            charcode = (FT_Int)T1_ToInt( parser );
            T1_Skip_Spaces( parser );
          }

          cur = parser->root.cursor;

          if ( *cur == '/' && cur + 2 < limit && n < count )
          {
            FT_PtrDist  len;


            cur++;

            parser->root.cursor = cur;
            T1_Skip_PS_Token( parser );
            if ( parser->root.error )
              return;

            len = parser->root.cursor - cur;

            parser->root.error = T1_Add_Table( char_table, charcode,
                                               cur, len + 1 );
            if ( parser->root.error )
              return;
            char_table->elements[charcode][len] = '\0';

            n++;
          }
        }
        else
          T1_Skip_PS_Token( parser );

        T1_Skip_Spaces( parser );
      }

      face->type1.encoding_type = T1_ENCODING_TYPE_ARRAY;
      parser->root.cursor       = cur;
    }

    /* Otherwise, we should have either `StandardEncoding', */
    /* `ExpertEncoding', or `ISOLatin1Encoding'             */