cffgload.c

奇趣公司比较新的qt/emd版本

            FT_TRACE4(( " rand" ));

            Rand = seed;
            if ( Rand >= 0x8000L )
              Rand++;

            args[0] = Rand;
            seed    = FT_MulFix( seed, 0x10000L - seed );
            if ( seed == 0 )
              seed += 0x2873;
            args++;
          }
          break;

        case cff_op_mul:
          FT_TRACE4(( " mul" ));

          args[0] = FT_MulFix( args[0], args[1] );
          args++;
          break;

        case cff_op_sqrt:
          FT_TRACE4(( " sqrt" ));

          if ( args[0] > 0 )
          {
            FT_Int    count = 9;
            FT_Fixed  root  = args[0];
            FT_Fixed  new_root;


            for (;;)
            {
              new_root = ( root + FT_DivFix( args[0], root ) + 1 ) >> 1;
              if ( new_root == root || count <= 0 )
                break;
              root = new_root;
            }
            args[0] = new_root;
          }
          else
            args[0] = 0;
          args++;
          break;

        case cff_op_drop:
          /* nothing */
          FT_TRACE4(( " drop" ));

          break;

        case cff_op_exch:
          {
            FT_Fixed  tmp;


            FT_TRACE4(( " exch" ));

            tmp     = args[0];
            args[0] = args[1];
            args[1] = tmp;
            args   += 2;
          }
          break;

        case cff_op_index:
          {
            FT_Int  idx = (FT_Int)( args[0] >> 16 );


            FT_TRACE4(( " index" ));

            if ( idx < 0 )
              idx = 0;
            else if ( idx > num_args - 2 )
              idx = num_args - 2;
            args[0] = args[-( idx + 1 )];
            args++;
          }
          break;

        case cff_op_roll:
          {
            FT_Int  count = (FT_Int)( args[0] >> 16 );
            FT_Int  idx   = (FT_Int)( args[1] >> 16 );


            FT_TRACE4(( " roll" ));

            if ( count <= 0 )
              count = 1;

            args -= count;
            if ( args < stack )
              goto Stack_Underflow;

            if ( idx >= 0 )
            {
              while ( idx > 0 )
              {
                FT_Fixed  tmp = args[count - 1];
                FT_Int    i;


                for ( i = count - 2; i >= 0; i-- )
                  args[i + 1] = args[i];
                args[0] = tmp;
                idx--;
              }
            }
            else
            {
              while ( idx < 0 )
              {
                FT_Fixed  tmp = args[0];
                FT_Int    i;


                for ( i = 0; i < count - 1; i++ )
                  args[i] = args[i + 1];
                args[count - 1] = tmp;
                idx++;
              }
            }
            args += count;
          }
          break;

        case cff_op_dup:
          FT_TRACE4(( " dup" ));

          args[1] = args[0];
          args++;
          break;

        case cff_op_put:
          {
            FT_Fixed  val = args[0];
            FT_Int    idx = (FT_Int)( args[1] >> 16 );


            FT_TRACE4(( " put" ));

            if ( idx >= 0 && idx < decoder->len_buildchar )
              decoder->buildchar[idx] = val;
          }
          break;

        case cff_op_get:
          {
            FT_Int    idx = (FT_Int)( args[0] >> 16 );
            FT_Fixed  val = 0;


            FT_TRACE4(( " get" ));

            if ( idx >= 0 && idx < decoder->len_buildchar )
              val = decoder->buildchar[idx];

            args[0] = val;
            args++;
          }
          break;

        case cff_op_store:
          FT_TRACE4(( " store "));

          goto Unimplemented;

        case cff_op_load:
          FT_TRACE4(( " load" ));

          goto Unimplemented;

        case cff_op_dotsection:
          /* this operator is deprecated and ignored by the parser */
          FT_TRACE4(( " dotsection" ));
          break;

        case cff_op_and:
          {
            FT_Fixed  cond = args[0] && args[1];


            FT_TRACE4(( " and" ));

            args[0] = cond ? 0x10000L : 0;
            args++;
          }
          break;

        case cff_op_or:
          {
            FT_Fixed  cond = args[0] || args[1];


            FT_TRACE4(( " or" ));

            args[0] = cond ? 0x10000L : 0;
            args++;
          }
          break;

        case cff_op_eq:
          {
            FT_Fixed  cond = !args[0];


            FT_TRACE4(( " eq" ));

            args[0] = cond ? 0x10000L : 0;
            args++;
          }
          break;

        case cff_op_ifelse:
          {
            FT_Fixed  cond = ( args[2] <= args[3] );


            FT_TRACE4(( " ifelse" ));

            if ( !cond )
              args[0] = args[1];
            args++;
          }
          break;

        case cff_op_callsubr:
          {
            FT_UInt  idx = (FT_UInt)( ( args[0] >> 16 ) +
                                      decoder->locals_bias );


            FT_TRACE4(( " callsubr(%d)", idx ));

            if ( idx >= decoder->num_locals )
            {
              FT_ERROR(( "cff_decoder_parse_charstrings:" ));
              FT_ERROR(( "  invalid local subr index\n" ));
              goto Syntax_Error;
            }

            if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS )
            {
              FT_ERROR(( "cff_decoder_parse_charstrings:"
                         " too many nested subrs\n" ));
              goto Syntax_Error;
            }

            zone->cursor = ip;  /* save current instruction pointer */

            zone++;
            zone->base   = decoder->locals[idx];
            zone->limit  = decoder->locals[idx + 1];
            zone->cursor = zone->base;

            if ( !zone->base || zone->limit == zone->base )
            {
              FT_ERROR(( "cff_decoder_parse_charstrings:"
                         " invoking empty subrs!\n" ));
              goto Syntax_Error;
            }

            decoder->zone = zone;
            ip            = zone->base;
            limit         = zone->limit;
          }
          break;

        case cff_op_callgsubr:
          {
            FT_UInt  idx = (FT_UInt)( ( args[0] >> 16 ) +
                                      decoder->globals_bias );


            FT_TRACE4(( " callgsubr(%d)", idx ));

            if ( idx >= decoder->num_globals )
            {
              FT_ERROR(( "cff_decoder_parse_charstrings:" ));
              FT_ERROR(( " invalid global subr index\n" ));
              goto Syntax_Error;
            }

            if ( zone - decoder->zones >= CFF_MAX_SUBRS_CALLS )
            {
              FT_ERROR(( "cff_decoder_parse_charstrings:"
                         " too many nested subrs\n" ));
              goto Syntax_Error;
            }

            zone->cursor = ip;  /* save current instruction pointer */

            zone++;
            zone->base   = decoder->globals[idx];
            zone->limit  = decoder->globals[idx + 1];
            zone->cursor = zone->base;

            if ( !zone->base || zone->limit == zone->base )
            {
              FT_ERROR(( "cff_decoder_parse_charstrings:"
                         " invoking empty subrs!\n" ));
              goto Syntax_Error;
            }

            decoder->zone = zone;
            ip            = zone->base;
            limit         = zone->limit;
          }
          break;

        case cff_op_return:
          FT_TRACE4(( " return" ));

          if ( decoder->zone <= decoder->zones )
          {
            FT_ERROR(( "cff_decoder_parse_charstrings:"
                       " unexpected return\n" ));
            goto Syntax_Error;
          }

          decoder->zone--;
          zone  = decoder->zone;
          ip    = zone->cursor;
          limit = zone->limit;
          break;

        default:
        Unimplemented:
          FT_ERROR(( "Unimplemented opcode: %d", ip[-1] ));

          if ( ip[-1] == 12 )
            FT_ERROR(( " %d", ip[0] ));
          FT_ERROR(( "\n" ));

          return CFF_Err_Unimplemented_Feature;
        }

      decoder->top = args;

      } /* general operator processing */

    } /* while ip < limit */

    FT_TRACE4(( "..end..\n\n" ));

  Fail:
    return error;

  Syntax_Error:
    FT_TRACE4(( "cff_decoder_parse_charstrings: syntax error!" ));
    return CFF_Err_Invalid_File_Format;

  Stack_Underflow:
    FT_TRACE4(( "cff_decoder_parse_charstrings: stack underflow!" ));
    return CFF_Err_Too_Few_Arguments;

  Stack_Overflow:
    FT_TRACE4(( "cff_decoder_parse_charstrings: stack overflow!" ));
    return CFF_Err_Stack_Overflow;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /**********                                                      *********/
  /**********                                                      *********/
  /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
  /**********                                                      *********/
  /**********    The following code is in charge of computing      *********/
  /**********    the maximum advance width of the font.  It        *********/
  /**********    quickly processes each glyph charstring to        *********/
  /**********    extract the value from either a `sbw' or `seac'   *********/
  /**********    operator.                                         *********/
  /**********                                                      *********/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


#if 0 /* unused until we support pure CFF fonts */


  FT_LOCAL_DEF( FT_Error )
  cff_compute_max_advance( TT_Face  face,
                           FT_Int*  max_advance )
  {
    FT_Error     error = CFF_Err_Ok;
    CFF_Decoder  decoder;
    FT_Int       glyph_index;
    CFF_Font     cff = (CFF_Font)face->other;


    *max_advance = 0;

    /* Initialize load decoder */
    cff_decoder_init( &decoder, face, 0, 0, 0, 0 );

    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 < face->root.num_glyphs;
          glyph_index++ )
    {
      FT_Byte*  charstring;
      FT_ULong  charstring_len;


      /* now get load the unscaled outline */
      error = cff_get_glyph_data( face, glyph_index,
                                  &charstring, &charstring_len );
      if ( !error )
      {
        cff_decoder_prepare( &decoder, glyph_index );
        error = cff_decoder_parse_charstrings( &decoder,
                                               charstring, charstring_len );

        cff_free_glyph_data( face, &charstring, &charstring_len );
      }

      /* ignore the error if one has occurred -- skip to next glyph */
      error = CFF_Err_Ok;
    }

    *max_advance = decoder.builder.advance.x;

    return CFF_Err_Ok;
  }


#endif /* 0 */


  FT_LOCAL_DEF( FT_Error )
  cff_slot_load( CFF_GlyphSlot  glyph,
                 CFF_Size       size,
                 FT_UInt        glyph_index,
                 FT_Int32       load_flags )
  {
    FT_Error     error;
    CFF_Decoder  decoder;
    TT_Face      face     = (TT_Face)glyph->root.face;
    FT_Bool      hinting;
    CFF_Font     cff      = (CFF_Font)face->extra.data;

    FT_Matrix    font_matrix;
    FT_Vector    font_offset;


    /* in a CID-keyed font, consider `glyph_index' as a CID and map */
    /* it immediately to the real gl