t1decode.c

qt-embedded-2.3.8.tar.gz源码

    x = builder->pos_x;
    y = builder->pos_y;

    /* 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_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 = (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_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_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:" ));
            FT_ERROR(( " `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_Long*   delta;
            FT_Long*   values;


            if ( !blend )
            {
              FT_ERROR(( "T1_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_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_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 */