cffgload.c

source code: Covert TXT to PDF

            if ( index >= 0 )
            {
              while ( index > 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;
                index--;
              }
            }
            else
            {
              while ( index < 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;
                index++;
              }
            }
            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    index = (FT_Int)( args[1] >> 16 );


            FT_TRACE4(( " put" ));

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

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


            FT_TRACE4(( " get" ));

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

            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  index = (FT_UInt)( ( args[0] >> 16 ) +
                                        decoder->locals_bias );


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

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

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

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

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

            if ( !zone->base )
            {
              FT_ERROR(( "CFF_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  index = (FT_UInt)( ( args[0] >> 16 ) +
                                        decoder->globals_bias );


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

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

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

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

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

            if ( !zone->base )
            {
              FT_ERROR(( "CFF_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_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" ));

    return error;

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

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

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

  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 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 = 0;
    CFF_Decoder  decoder;
    FT_Int       glyph_index;
    CFF_Font*    cff = (CFF_Font*)face->other;


    *max_advance = 0;

    /* Initialize load decoder */
    CFF_Init_Decoder( &decoder, face, 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_Access_Element( &cff->charstrings_index, glyph_index,
                                  &charstring, &charstring_len );
      if ( !error )
      {
        CFF_Prepare_Decoder( &decoder, glyph_index );
        error = CFF_Parse_CharStrings( &decoder, charstring, charstring_len );

        CFF_Forget_Element( &cff->charstrings_index, &charstring );
      }

      /* ignore the error if one has occurred -- skip to next glyph */
      error = 0;
    }

    *max_advance = decoder.builder.advance.x;

    return CFF_Err_Ok;
  }


#endif /* 0 */


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /**********                                                      *********/
  /**********                                                      *********/
  /**********               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.       *********/
  /**********                                                      *********/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


  FT_LOCAL_DEF FT_Error
  CFF_Load_Glyph( CFF_GlyphSlot  glyph,
                  CFF_Size       size,
                  FT_Int         glyph_index,
                  FT_Int         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;


    if ( load_flags & FT_LOAD_NO_RECURSE )
      load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;

    glyph->x_scale = 0x10000L;
    glyph->y_scale = 0x10000L;
    if ( size )
    {
      glyph->x_scale = size->metrics.x_scale;
      glyph->y_scale = size->metrics.y_scale;
    }

    glyph->root.outline.n_points   = 0;
    glyph->root.outline.n_contours = 0;

    hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
                       ( load_flags & FT_LOAD_NO_HINTING ) == 0 );

    glyph->root.format = ft_glyph_format_outline;  /* by default */

    {
      FT_Byte*  charstring;
      FT_ULong  charstring_len;


      CFF_Init_Decoder( &decoder, face, size, glyph, hinting );

      decoder.builder.no_recurse =
        (FT_Bool)( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );

      /* now load the unscaled outline */
      error = CFF_Access_Element( &cff->charstrings_index, glyph_index,
                                  &charstring, &charstring_len );
      if ( !error )
      {
        CFF_Index csindex = cff->charstrings_index;


        CFF_Prepare_Decoder( &decoder, glyph_index );
        error = CFF_Parse_CharStrings( &decoder, charstring, charstring_len );

        CFF_Forget_Element( &cff->charstrings_index, &charstring );

        /* We set control_data and control_len if charstrings is loaded.  */
        /* See how charstring loads at CFF_Access_Element() in cffload.c. */

        glyph->root.control_data =
          csindex.bytes + csindex.offsets[glyph_index] - 1;
        glyph->root.control_len =
          charstring_len;
      }

      /* save new glyph tables */
      CFF_Builder_Done( &decoder.builder );
    }

    font_matrix = cff->top_font.font_dict.font_matrix;
    font_offset = cff->top_font.font_dict.font_offset;

    /* 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 left side bearing and */
      /* advance width.                                          */
      if ( load_flags & FT_LOAD_NO_RECURSE )
      {
        FT_Slot_Internal  internal = glyph->root.internal;


        glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
        glyph->root.metrics.horiAdvance  = decoder.glyph_width;
        internal->glyph_matrix           = font_matrix;
        internal->glyph_delta            = font_offset;
        internal->glyph_transformed      = 1;
      }
      else
      {
        FT_BBox            cbox;
        FT_Glyph_Metrics*  metrics = &glyph->root.metrics;


        /* copy the _unscaled_ advance width */
        metrics->horiAdvance                    = decoder.glyph_width;
        glyph->root.linearHoriAdvance           = decoder.glyph_width;
        glyph->root.internal->glyph_tra