Ejemplo n.º 1
0
  static FT_Error
  T1_Parse_Glyph_And_Get_Char_String( T1_Decoder  decoder,
                                      FT_UInt     glyph_index,
                                      FT_Data*    char_string,
                                      FT_Bool*    force_scaling )
  {
    T1_Face   face  = (T1_Face)decoder->builder.face;
    T1_Font   type1 = &face->type1;
    FT_Error  error = FT_Err_Ok;

    PSAux_Service           psaux         = (PSAux_Service)face->psaux;
    const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
    PS_Decoder              psdecoder;

#ifdef FT_CONFIG_OPTION_INCREMENTAL
    FT_Incremental_InterfaceRec *inc =
                      face->root.internal->incremental_interface;
#endif

#ifdef T1_CONFIG_OPTION_OLD_ENGINE
    PS_Driver  driver = (PS_Driver)FT_FACE_DRIVER( face );
#endif

    decoder->font_matrix = type1->font_matrix;
    decoder->font_offset = type1->font_offset;

#ifdef FT_CONFIG_OPTION_INCREMENTAL

    /* For incremental fonts get the character data using the */
    /* callback function.                                     */
    if ( inc )
      error = inc->funcs->get_glyph_data( inc->object,
                                          glyph_index, char_string );
    else

#endif /* FT_CONFIG_OPTION_INCREMENTAL */

    /* For ordinary fonts get the character data stored in the face record. */
    {
      char_string->pointer = type1->charstrings[glyph_index];
      char_string->length  = (FT_Int)type1->charstrings_len[glyph_index];
    }

    if ( !error )
    {
      /* choose which renderer to use */
#ifdef T1_CONFIG_OPTION_OLD_ENGINE
      if ( driver->hinting_engine == FT_HINTING_FREETYPE ||
           decoder->builder.metrics_only                 )
        error = decoder_funcs->parse_charstrings_old(
                  decoder,
                  (FT_Byte*)char_string->pointer,
                  (FT_UInt)char_string->length );
#else
      if ( decoder->builder.metrics_only )
        error = decoder_funcs->parse_metrics(
                  decoder,
                  (FT_Byte*)char_string->pointer,
                  (FT_UInt)char_string->length );
#endif
      else
      {
        CFF_SubFontRec  subfont;


        psaux->ps_decoder_init( &psdecoder, decoder, TRUE );

        psaux->t1_make_subfont( FT_FACE( face ),
                                &face->type1.private_dict, &subfont );
        psdecoder.current_subfont = &subfont;

        error = decoder_funcs->parse_charstrings(
                  &psdecoder,
                  (FT_Byte*)char_string->pointer,
                  (FT_ULong)char_string->length );

        /* Adobe's engine uses 16.16 numbers everywhere;              */
        /* as a consequence, glyphs larger than 2000ppem get rejected */
        if ( FT_ERR_EQ( error, Glyph_Too_Big ) )
        {
          /* this time, we retry unhinted and scale up the glyph later on */
          /* (the engine uses and sets the hardcoded value 0x10000 / 64 = */
          /* 0x400 for both `x_scale' and `y_scale' in this case)         */
          ((T1_GlyphSlot)decoder->builder.glyph)->hint = FALSE;

          *force_scaling = TRUE;

          error = decoder_funcs->parse_charstrings(
                    &psdecoder,
                    (FT_Byte*)char_string->pointer,
                    (FT_ULong)char_string->length );
        }
      }
    }

#ifdef FT_CONFIG_OPTION_INCREMENTAL

    /* Incremental fonts can optionally override the metrics. */
    if ( !error && inc && inc->funcs->get_glyph_metrics )
    {
      FT_Incremental_MetricsRec  metrics;


      metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
      metrics.bearing_y = 0;
      metrics.advance   = FIXED_TO_INT( decoder->builder.advance.x );
      metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );

      error = inc->funcs->get_glyph_metrics( inc->object,
                                             glyph_index, FALSE, &metrics );

      decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
      decoder->builder.advance.x      = INT_TO_FIXED( metrics.advance );
      decoder->builder.advance.y      = INT_TO_FIXED( metrics.advance_v );
    }

#endif /* FT_CONFIG_OPTION_INCREMENTAL */

    return error;
  }
  T1_Get_Private_Dict( T1_Parser      parser,
                       PSAux_Service  psaux )
  {
    FT_Stream  stream = parser->stream;
    FT_Memory  memory = parser->root.memory;
    FT_Error   error  = FT_Err_Ok;
    FT_ULong   size;


    if ( parser->in_pfb )
    {
      /* in the case of the PFB format, the private dictionary can be  */
      /* made of several segments.  We thus first read the number of   */
      /* segments to compute the total size of the private dictionary  */
      /* then re-read them into memory.                                */
      FT_Long    start_pos = FT_STREAM_POS();
      FT_UShort  tag;


      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error )
          goto Fail;

        if ( tag != 0x8002U )
          break;

        parser->private_len += size;

        if ( FT_STREAM_SKIP( size ) )
          goto Fail;
      }

      /* Check that we have a private dictionary there */
      /* and allocate private dictionary buffer        */
      if ( parser->private_len == 0 )
      {
        FT_ERROR(( "T1_Get_Private_Dict:"
                   " invalid private dictionary section\n" ));
        error = FT_THROW( Invalid_File_Format );
        goto Fail;
      }

      if ( FT_STREAM_SEEK( start_pos )                           ||
           FT_ALLOC( parser->private_dict, parser->private_len ) )
        goto Fail;

      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error || tag != 0x8002U )
        {
          error = FT_Err_Ok;
          break;
        }

        if ( FT_STREAM_READ( parser->private_dict + parser->private_len,
                             size ) )
          goto Fail;

        parser->private_len += size;
      }
    }
    else
    {
      /* We have already `loaded' the whole PFA font file into memory; */
      /* if this is a memory resource, allocate a new block to hold    */
      /* the private dict.  Otherwise, simply overwrite into the base  */
      /* dictionary block in the heap.                                 */

      /* first of all, look at the `eexec' keyword */
      FT_Byte*  cur   = parser->base_dict;
      FT_Byte*  limit = cur + parser->base_len;
      FT_Byte   c;


    Again:
      for (;;)
      {
        c = cur[0];
        if ( c == 'e' && cur + 9 < limit )  /* 9 = 5 letters for `eexec' + */
                                            /* whitespace + 4 chars        */
        {
          if ( cur[1] == 'e' &&
               cur[2] == 'x' &&
               cur[3] == 'e' &&
               cur[4] == 'c' )
            break;
        }
        cur++;
        if ( cur >= limit )
        {
          FT_ERROR(( "T1_Get_Private_Dict:"
                     " could not find `eexec' keyword\n" ));
          error = FT_THROW( Invalid_File_Format );
          goto Exit;
        }
      }

      /* check whether `eexec' was real -- it could be in a comment */
      /* or string (as e.g. in u003043t.gsf from ghostscript)       */

      parser->root.cursor = parser->base_dict;
      /* set limit to `eexec' + whitespace + 4 characters */
      parser->root.limit  = cur + 10;

      cur   = parser->root.cursor;
      limit = parser->root.limit;

      while ( cur < limit )
      {
        if ( *cur == 'e' && ft_strncmp( (char*)cur, "eexec", 5 ) == 0 )
          goto Found;

        T1_Skip_PS_Token( parser );
        if ( parser->root.error )
          break;
        T1_Skip_Spaces  ( parser );
        cur = parser->root.cursor;
      }

      /* we haven't found the correct `eexec'; go back and continue */
      /* searching                                                  */

      cur   = limit;
      limit = parser->base_dict + parser->base_len;
      goto Again;

      /* now determine where to write the _encrypted_ binary private  */
      /* dictionary.  We overwrite the base dictionary for disk-based */
      /* resources and allocate a new block otherwise                 */

    Found:
      parser->root.limit = parser->base_dict + parser->base_len;

      T1_Skip_PS_Token( parser );
      cur   = parser->root.cursor;
      limit = parser->root.limit;

      /* according to the Type1 spec, the first cipher byte must not be  */
      /* an ASCII whitespace character code (blank, tab, carriage return */
      /* or line feed).  We have seen Type 1 fonts with two line feed    */
      /* characters...  So skip now all whitespace character codes.      */
      /* SumatraPDF: stop at \r if it's not used for EOL - cf. https://code.google.com/p/sumatrapdf/issues/detail?id=2408 */
      c = !memchr(cur, '\n', limit - cur) || memchr(cur, '\n', limit - cur) > memchr(cur, '\r', limit - cur);
      while ( cur < limit       &&
              ( *cur == ' '  ||
                *cur == '\t' ||
                ( c && *cur == '\r' ) ||
                *cur == '\n' ) )
        ++cur;
      if ( cur >= limit )
      {
        FT_ERROR(( "T1_Get_Private_Dict:"
                   " `eexec' not properly terminated\n" ));
        error = FT_THROW( Invalid_File_Format );
        goto Exit;
      }

      size = (FT_ULong)( parser->base_len - ( cur - parser->base_dict ) );

      if ( parser->in_memory )
      {
        /* note that we allocate one more byte to put a terminating `0' */
        if ( FT_ALLOC( parser->private_dict, size + 1 ) )
          goto Fail;
        parser->private_len = size;
      }
      else
      {
        parser->single_block = 1;
        parser->private_dict = parser->base_dict;
        parser->private_len  = size;
        parser->base_dict    = 0;
        parser->base_len     = 0;
      }

      /* now determine whether the private dictionary is encoded in binary */
      /* or hexadecimal ASCII format -- decode it accordingly              */

      /* we need to access the next 4 bytes (after the final whitespace */
      /* following the `eexec' keyword); if they all are hexadecimal    */
      /* digits, then we have a case of ASCII storage                   */

      if ( cur + 3 < limit                                &&
           ft_isxdigit( cur[0] ) && ft_isxdigit( cur[1] ) &&
           ft_isxdigit( cur[2] ) && ft_isxdigit( cur[3] ) )
      {
        /* ASCII hexadecimal encoding */
        FT_Long  len;


        parser->root.cursor = cur;
        (void)psaux->ps_parser_funcs->to_bytes( &parser->root,
                                                parser->private_dict,
                                                parser->private_len,
                                                &len,
                                                0 );
        parser->private_len = len;

        /* put a safeguard */
        parser->private_dict[len] = '\0';
      }
      else
        /* binary encoding -- copy the private dict */
        FT_MEM_MOVE( parser->private_dict, cur, size );
    }

    /* we now decrypt the encoded binary private dictionary */
    psaux->t1_decrypt( parser->private_dict, parser->private_len, 55665U );

    if ( parser->private_len < 4 )
    {
      FT_ERROR(( "T1_Get_Private_Dict:"
                 " invalid private dictionary section\n" ));
      error = FT_THROW( Invalid_File_Format );
      goto Fail;
    }

    /* replace the four random bytes at the beginning with whitespace */
    parser->private_dict[0] = ' ';
    parser->private_dict[1] = ' ';
    parser->private_dict[2] = ' ';
    parser->private_dict[3] = ' ';

    parser->root.base   = parser->private_dict;
    parser->root.cursor = parser->private_dict;
    parser->root.limit  = parser->root.cursor + parser->private_len;

  Fail:
  Exit:
    return error;
  }
Ejemplo n.º 3
0
  cid_load_glyph( T1_Decoder  decoder,
                  FT_UInt     glyph_index )
  {
    CID_Face       face = (CID_Face)decoder->builder.face;
    CID_FaceInfo   cid  = &face->cid;
    FT_Byte*       p;
    FT_UInt        fd_select;
    FT_Stream      stream       = face->cid_stream;
    FT_Error       error        = CID_Err_Ok;
    FT_Byte*       charstring   = 0;
    FT_Memory      memory       = face->root.memory;
    FT_ULong       glyph_length = 0;
    PSAux_Service  psaux        = (PSAux_Service)face->psaux;

#ifdef FT_CONFIG_OPTION_INCREMENTAL
    FT_Incremental_InterfaceRec *inc =
                                  face->root.internal->incremental_interface;
#endif


    FT_TRACE4(( "cid_load_glyph: glyph index %d\n", glyph_index ));

#ifdef FT_CONFIG_OPTION_INCREMENTAL

    /* For incremental fonts get the character data using */
    /* the callback function.                             */
    if ( inc )
    {
      FT_Data  glyph_data;


      error = inc->funcs->get_glyph_data( inc->object,
                                          glyph_index, &glyph_data );
      if ( error )
        goto Exit;

      p         = (FT_Byte*)glyph_data.pointer;
      fd_select = (FT_UInt)cid_get_offset( &p, (FT_Byte)cid->fd_bytes );

      if ( glyph_data.length != 0 )
      {
        glyph_length = glyph_data.length - cid->fd_bytes;
        (void)FT_ALLOC( charstring, glyph_length );
        if ( !error )
          ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes,
                     glyph_length );
      }

      inc->funcs->free_glyph_data( inc->object, &glyph_data );

      if ( error )
        goto Exit;
    }

    else

#endif /* FT_CONFIG_OPTION_INCREMENTAL */

    /* For ordinary fonts read the CID font dictionary index */
    /* and charstring offset from the CIDMap.                */
    {
      FT_UInt   entry_len = cid->fd_bytes + cid->gd_bytes;
      FT_ULong  off1;


      if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
                           glyph_index * entry_len )               ||
           FT_FRAME_ENTER( 2 * entry_len )                         )
        goto Exit;

      p            = (FT_Byte*)stream->cursor;
      fd_select    = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
      off1         = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
      p           += cid->fd_bytes;
      glyph_length = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
      FT_FRAME_EXIT();

      if ( fd_select >= (FT_UInt)cid->num_dicts )
      {
        error = CID_Err_Invalid_Offset;
        goto Exit;
      }
      if ( glyph_length == 0 )
        goto Exit;
      if ( FT_ALLOC( charstring, glyph_length ) )
        goto Exit;
      if ( FT_STREAM_READ_AT( cid->data_offset + off1,
                              charstring, glyph_length ) )
        goto Exit;
    }

    /* Now set up the subrs array and parse the charstrings. */
    {
      CID_FaceDict  dict;
      CID_Subrs     cid_subrs = face->subrs + fd_select;
      FT_Int        cs_offset;


      /* Set up subrs */
      decoder->num_subrs = cid_subrs->num_subrs;
      decoder->subrs     = cid_subrs->code;
      decoder->subrs_len = 0;

      /* Set up font matrix */
      dict                 = cid->font_dicts + fd_select;

      decoder->font_matrix = dict->font_matrix;
      decoder->font_offset = dict->font_offset;
      decoder->lenIV       = dict->private_dict.lenIV;

      /* Decode the charstring. */

      /* Adjustment for seed bytes. */
      cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );

      /* Decrypt only if lenIV >= 0. */
      if ( decoder->lenIV >= 0 )
        psaux->t1_decrypt( charstring, glyph_length, 4330 );

      error = decoder->funcs.parse_charstrings(
                decoder, charstring + cs_offset,
                (FT_Int)glyph_length - cs_offset );
    }

    FT_FREE( charstring );

#ifdef FT_CONFIG_OPTION_INCREMENTAL

    /* Incremental fonts can optionally override the metrics. */
    if ( !error && inc && inc->funcs->get_glyph_metrics )
    {
      FT_Incremental_MetricsRec  metrics;


      metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
      metrics.bearing_y = 0;
      metrics.advance   = FIXED_TO_INT( decoder->builder.advance.x );
      metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );

      error = inc->funcs->get_glyph_metrics( inc->object,
                                             glyph_index, FALSE, &metrics );

      decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
      decoder->builder.advance.x      = INT_TO_FIXED( metrics.advance );
      decoder->builder.advance.y      = INT_TO_FIXED( metrics.advance_v );
    }

#endif /* FT_CONFIG_OPTION_INCREMENTAL */

  Exit:
    return error;
  }
Ejemplo n.º 4
0
Archivo: cffgload.c Proyecto: 93i/godot
  cff_slot_load( CFF_GlyphSlot  glyph,
                 CFF_Size       size,
                 FT_UInt        glyph_index,
                 FT_Int32       load_flags )
  {
    FT_Error     error;
    CFF_Decoder  decoder;
    PS_Decoder   psdecoder;
    TT_Face      face = (TT_Face)glyph->root.face;
    FT_Bool      hinting, scaled, force_scaling;
    CFF_Font     cff  = (CFF_Font)face->extra.data;

    PSAux_Service            psaux         = (PSAux_Service)face->psaux;
    const CFF_Decoder_Funcs  decoder_funcs = psaux->cff_decoder_funcs;

    FT_Matrix    font_matrix;
    FT_Vector    font_offset;


    force_scaling = FALSE;

    /* in a CID-keyed font, consider `glyph_index' as a CID and map */
    /* it immediately to the real glyph_index -- if it isn't a      */
    /* subsetted font, glyph_indices and CIDs are identical, though */
    if ( cff->top_font.font_dict.cid_registry != 0xFFFFU &&
         cff->charset.cids                               )
    {
      /* don't handle CID 0 (.notdef) which is directly mapped to GID 0 */
      if ( glyph_index != 0 )
      {
        glyph_index = cff_charset_cid_to_gindex( &cff->charset,
                                                 glyph_index );
        if ( glyph_index == 0 )
          return FT_THROW( Invalid_Argument );
      }
    }
    else if ( glyph_index >= cff->num_glyphs )
      return FT_THROW( Invalid_Argument );

    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->root.metrics.x_scale;
      glyph->y_scale = size->root.metrics.y_scale;
    }

#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS

    /* try to load embedded bitmap if any              */
    /*                                                 */
    /* XXX: The convention should be emphasized in     */
    /*      the documents because it can be confusing. */
    if ( size )
    {
      CFF_Face      cff_face = (CFF_Face)size->root.face;
      SFNT_Service  sfnt     = (SFNT_Service)cff_face->sfnt;
      FT_Stream     stream   = cff_face->root.stream;


      if ( size->strike_index != 0xFFFFFFFFUL      &&
           sfnt->load_eblc                         &&
           ( load_flags & FT_LOAD_NO_BITMAP ) == 0 )
      {
        TT_SBit_MetricsRec  metrics;


        error = sfnt->load_sbit_image( face,
                                       size->strike_index,
                                       glyph_index,
                                       (FT_UInt)load_flags,
                                       stream,
                                       &glyph->root.bitmap,
                                       &metrics );

        if ( !error )
        {
          FT_Bool    has_vertical_info;
          FT_UShort  advance;
          FT_Short   dummy;


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

          glyph->root.metrics.width  = (FT_Pos)metrics.width  << 6;
          glyph->root.metrics.height = (FT_Pos)metrics.height << 6;

          glyph->root.metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6;
          glyph->root.metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6;
          glyph->root.metrics.horiAdvance  = (FT_Pos)metrics.horiAdvance  << 6;

          glyph->root.metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6;
          glyph->root.metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6;
          glyph->root.metrics.vertAdvance  = (FT_Pos)metrics.vertAdvance  << 6;

          glyph->root.format = FT_GLYPH_FORMAT_BITMAP;

          if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
          {
            glyph->root.bitmap_left = metrics.vertBearingX;
            glyph->root.bitmap_top  = metrics.vertBearingY;
          }
          else
          {
            glyph->root.bitmap_left = metrics.horiBearingX;
            glyph->root.bitmap_top  = metrics.horiBearingY;
          }

          /* compute linear advance widths */

          (void)( (SFNT_Service)face->sfnt )->get_metrics( face, 0,
                                                           glyph_index,
                                                           &dummy,
                                                           &advance );
          glyph->root.linearHoriAdvance = advance;

          has_vertical_info = FT_BOOL(
                                face->vertical_info                   &&
                                face->vertical.number_Of_VMetrics > 0 );

          /* get the vertical metrics from the vmtx table if we have one */
          if ( has_vertical_info )
          {
            (void)( (SFNT_Service)face->sfnt )->get_metrics( face, 1,
                                                             glyph_index,
                                                             &dummy,
                                                             &advance );
            glyph->root.linearVertAdvance = advance;
          }
          else
          {
            /* make up vertical ones */
            if ( face->os2.version != 0xFFFFU )
              glyph->root.linearVertAdvance = (FT_Pos)
                ( face->os2.sTypoAscender - face->os2.sTypoDescender );
            else
              glyph->root.linearVertAdvance = (FT_Pos)
                ( face->horizontal.Ascender - face->horizontal.Descender );
          }

          return error;
        }
      }
    }

#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

    /* return immediately if we only want the embedded bitmaps */
    if ( load_flags & FT_LOAD_SBITS_ONLY )
      return FT_THROW( Invalid_Argument );

    /* if we have a CID subfont, use its matrix (which has already */
    /* been multiplied with the root matrix)                       */

    /* this scaling is only relevant if the PS hinter isn't active */
    if ( cff->num_subfonts )
    {
      FT_Long  top_upm, sub_upm;
      FT_Byte  fd_index = cff_fd_select_get( &cff->fd_select,
                                             glyph_index );


      if ( fd_index >= cff->num_subfonts )
        fd_index = (FT_Byte)( cff->num_subfonts - 1 );

      top_upm = (FT_Long)cff->top_font.font_dict.units_per_em;
      sub_upm = (FT_Long)cff->subfonts[fd_index]->font_dict.units_per_em;


      font_matrix = cff->subfonts[fd_index]->font_dict.font_matrix;
      font_offset = cff->subfonts[fd_index]->font_dict.font_offset;

      if ( top_upm != sub_upm )
      {
        glyph->x_scale = FT_MulDiv( glyph->x_scale, top_upm, sub_upm );
        glyph->y_scale = FT_MulDiv( glyph->y_scale, top_upm, sub_upm );

        force_scaling = TRUE;
      }
    }
    else
    {
      font_matrix = cff->top_font.font_dict.font_matrix;
      font_offset = cff->top_font.font_dict.font_offset;
    }

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

    /* top-level code ensures that FT_LOAD_NO_HINTING is set */
    /* if FT_LOAD_NO_SCALE is active                         */
    hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
    scaled  = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 );

    glyph->hint        = hinting;
    glyph->scaled      = scaled;
    glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;  /* by default */

    {
#ifdef CFF_CONFIG_OPTION_OLD_ENGINE
      PS_Driver  driver = (PS_Driver)FT_FACE_DRIVER( face );
#endif


      FT_Byte*  charstring;
      FT_ULong  charstring_len;


      decoder_funcs->init( &decoder, face, size, glyph, hinting,
                           FT_LOAD_TARGET_MODE( load_flags ),
                           cff_get_glyph_data,
                           cff_free_glyph_data );

      /* this is for pure CFFs */
      if ( load_flags & FT_LOAD_ADVANCE_ONLY )
        decoder.width_only = TRUE;

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

      /* now load the unscaled outline */
      error = cff_get_glyph_data( face, glyph_index,
                                  &charstring, &charstring_len );
      if ( error )
        goto Glyph_Build_Finished;

      error = decoder_funcs->prepare( &decoder, size, glyph_index );
      if ( error )
        goto Glyph_Build_Finished;

#ifdef CFF_CONFIG_OPTION_OLD_ENGINE
      /* choose which CFF renderer to use */
      if ( driver->hinting_engine == FT_HINTING_FREETYPE )
        error = decoder_funcs->parse_charstrings_old( &decoder,
                                                      charstring,
                                                      charstring_len,
                                                      0 );
      else
#endif
      {
        psaux->ps_decoder_init( &psdecoder, &decoder, FALSE );

        error = decoder_funcs->parse_charstrings( &psdecoder,
                                                  charstring,
                                                  charstring_len );

        /* Adobe's engine uses 16.16 numbers everywhere;              */
        /* as a consequence, glyphs larger than 2000ppem get rejected */
        if ( FT_ERR_EQ( error, Glyph_Too_Big ) )
        {
          /* this time, we retry unhinted and scale up the glyph later on */
          /* (the engine uses and sets the hardcoded value 0x10000 / 64 = */
          /* 0x400 for both `x_scale' and `y_scale' in this case)         */
          hinting       = FALSE;
          force_scaling = TRUE;
          glyph->hint   = hinting;

          error = decoder_funcs->parse_charstrings( &psdecoder,
                                                    charstring,
                                                    charstring_len );
        }
      }

      cff_free_glyph_data( face, &charstring, charstring_len );

      if ( error )
        goto Glyph_Build_Finished;

#ifdef FT_CONFIG_OPTION_INCREMENTAL
      /* Control data and length may not be available for incremental */
      /* fonts.                                                       */
      if ( face->root.internal->incremental_interface )
      {
        glyph->root.control_data = NULL;
        glyph->root.control_len = 0;
      }
      else
#endif /* FT_CONFIG_OPTION_INCREMENTAL */

      /* We set control_data and control_len if charstrings is loaded. */
      /* See how charstring loads at cff_index_access_element() in     */
      /* cffload.c.                                                    */
      {
        CFF_Index  csindex = &cff->charstrings_index;


        if ( csindex->offsets )
        {
          glyph->root.control_data = csindex->bytes +
                                     csindex->offsets[glyph_index] - 1;
          glyph->root.control_len  = (FT_Long)charstring_len;
        }
      }

  Glyph_Build_Finished:
      /* save new glyph tables, if no error */
      if ( !error )
        decoder.builder.funcs.done( &decoder.builder );
      /* XXX: anything to do for broken glyph entry? */
    }

#ifdef FT_CONFIG_OPTION_INCREMENTAL

    /* Incremental fonts can optionally override the metrics. */
    if ( !error                                                               &&
         face->root.internal->incremental_interface                           &&
         face->root.internal->incremental_interface->funcs->get_glyph_metrics )
    {
      FT_Incremental_MetricsRec  metrics;


      metrics.bearing_x = decoder.builder.left_bearing.x;
      metrics.bearing_y = 0;
      metrics.advance   = decoder.builder.advance.x;
      metrics.advance_v = decoder.builder.advance.y;

      error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
                face->root.internal->incremental_interface->object,
                glyph_index, FALSE, &metrics );

      decoder.builder.left_bearing.x = metrics.bearing_x;
      decoder.builder.advance.x      = metrics.advance;
      decoder.builder.advance.y      = metrics.advance_v;
    }

#endif /* FT_CONFIG_OPTION_INCREMENTAL */

    if ( !error )
    {
      /* Now, set the metrics -- this is rather simple, as   */
      /* the left side bearing is the xMin, and the top side */
      /* bearing the yMax.                                   */

      /* 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;
        FT_Bool            has_vertical_info;


        if ( face->horizontal.number_Of_HMetrics )
        {
          FT_Short   horiBearingX = 0;
          FT_UShort  horiAdvance  = 0;


          ( (SFNT_Service)face->sfnt )->get_metrics( face, 0,
                                                     glyph_index,
                                                     &horiBearingX,
                                                     &horiAdvance );
          metrics->horiAdvance          = horiAdvance;
          metrics->horiBearingX         = horiBearingX;
          glyph->root.linearHoriAdvance = horiAdvance;
        }
        else
        {
          /* copy the _unscaled_ advance width */
          metrics->horiAdvance          = decoder.glyph_width;
          glyph->root.linearHoriAdvance = decoder.glyph_width;
        }

        glyph->root.internal->glyph_transformed = 0;

        has_vertical_info = FT_BOOL( face->vertical_info                   &&
                                     face->vertical.number_Of_VMetrics > 0 );

        /* get the vertical metrics from the vmtx table if we have one */
        if ( has_vertical_info )
        {
          FT_Short   vertBearingY = 0;
          FT_UShort  vertAdvance  = 0;


          ( (SFNT_Service)face->sfnt )->get_metrics( face, 1,
                                                     glyph_index,
                                                     &vertBearingY,
                                                     &vertAdvance );
          metrics->vertBearingY = vertBearingY;
          metrics->vertAdvance  = vertAdvance;
        }
        else
        {
          /* make up vertical ones */
          if ( face->os2.version != 0xFFFFU )
            metrics->vertAdvance = (FT_Pos)( face->os2.sTypoAscender -
                                             face->os2.sTypoDescender );
          else
            metrics->vertAdvance = (FT_Pos)( face->horizontal.Ascender -
                                             face->horizontal.Descender );
        }

        glyph->root.linearVertAdvance = metrics->vertAdvance;

        glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;

        glyph->root.outline.flags = 0;
        if ( size && size->root.metrics.y_ppem < 24 )
          glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;

        glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;

        /* apply the font matrix, if any */
        if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L ||
             font_matrix.xy != 0        || font_matrix.yx != 0        )
        {
          FT_Outline_Transform( &glyph->root.outline, &font_matrix );

          metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
                                            font_matrix.xx );
          metrics->vertAdvance = FT_MulFix( metrics->vertAdvance,
                                            font_matrix.yy );
        }

        if ( font_offset.x || font_offset.y )
        {
          FT_Outline_Translate( &glyph->root.outline,
                                font_offset.x,
                                font_offset.y );

          metrics->horiAdvance += font_offset.x;
          metrics->vertAdvance += font_offset.y;
        }

        if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || force_scaling )
        {
          /* scale the outline and the metrics */
          FT_Int       n;
          FT_Outline*  cur     = &glyph->root.outline;
          FT_Vector*   vec     = cur->points;
          FT_Fixed     x_scale = glyph->x_scale;
          FT_Fixed     y_scale = glyph->y_scale;


          /* First of all, scale the points */
          if ( !hinting || !decoder.builder.hints_funcs )
            for ( n = cur->n_points; n > 0; n--, vec++ )
            {
              vec->x = FT_MulFix( vec->x, x_scale );
              vec->y = FT_MulFix( vec->y, y_scale );
            }

          /* Then scale the metrics */
          metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
          metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
        }

        /* compute the other metrics */
        FT_Outline_Get_CBox( &glyph->root.outline, &cbox );

        metrics->width  = cbox.xMax - cbox.xMin;
        metrics->height = cbox.yMax - cbox.yMin;

        metrics->horiBearingX = cbox.xMin;
        metrics->horiBearingY = cbox.yMax;

        if ( has_vertical_info )
          metrics->vertBearingX = metrics->horiBearingX -
                                    metrics->horiAdvance / 2;
        else
        {
          if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
            ft_synthesize_vertical_metrics( metrics,
                                            metrics->vertAdvance );
        }
      }
    }

    return error;
  }
Ejemplo n.º 5
0
Archivo: t1parse.c Proyecto: 8l/inferno
  T1_Get_Private_Dict( T1_Parser      parser,
                       PSAux_Service  psaux )
  {
    FT_Stream  stream = parser->stream;
    FT_Memory  memory = parser->root.memory;
    FT_Error   error  = 0;
    FT_Long    size;


    if ( parser->in_pfb )
    {
      /* in the case of the PFB format, the private dictionary can be  */
      /* made of several segments.  We thus first read the number of   */
      /* segments to compute the total size of the private dictionary  */
      /* then re-read them into memory.                                */
      FT_Long    start_pos = FT_STREAM_POS();
      FT_UShort  tag;


      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error )
          goto Fail;

        if ( tag != 0x8002U )
          break;

        parser->private_len += size;

        if ( FT_STREAM_SKIP( size ) )
          goto Fail;
      }

      /* Check that we have a private dictionary there */
      /* and allocate private dictionary buffer        */
      if ( parser->private_len == 0 )
      {
        FT_ERROR(( "T1_Get_Private_Dict:" ));
        FT_ERROR(( " invalid private dictionary section\n" ));
        error = T1_Err_Invalid_File_Format;
        goto Fail;
      }

      if ( FT_STREAM_SEEK( start_pos )                             ||
           FT_ALLOC( parser->private_dict, parser->private_len ) )
        goto Fail;

      parser->private_len = 0;
      for (;;)
      {
        error = read_pfb_tag( stream, &tag, &size );
        if ( error || tag != 0x8002U )
        {
          error = T1_Err_Ok;
          break;
        }

        if ( FT_STREAM_READ( parser->private_dict + parser->private_len, size ) )
          goto Fail;

        parser->private_len += size;
      }
    }
    else
    {
      /* we have already `loaded' the whole PFA font file into memory; */
      /* if this is a memory resource, allocate a new block to hold    */
      /* the private dict. Otherwise, simply overwrite into the base   */
      /* dictionary block in the heap.                                 */

      /* first of all, look at the `eexec' keyword */
      FT_Byte*  cur   = parser->base_dict;
      FT_Byte*  limit = cur + parser->base_len;
      FT_Byte   c;


      for (;;)
      {
        c = cur[0];
        if ( c == 'e' && cur + 9 < limit )  /* 9 = 5 letters for `eexec' + */
                                            /* newline + 4 chars           */
        {
          if ( cur[1] == 'e' && cur[2] == 'x' &&
               cur[3] == 'e' && cur[4] == 'c' )
          {
            cur += 6; /* we skip the newling after the `eexec' */

            /* XXX: Some fonts use DOS-linefeeds, i.e. \r\n; we need to */
            /*      skip the extra \n if we find it                     */
            if ( cur[0] == '\n' )
              cur++;

            break;
          }
        }
        cur++;
        if ( cur >= limit )
        {
          FT_ERROR(( "T1_Get_Private_Dict:" ));
          FT_ERROR(( " could not find `eexec' keyword\n" ));
          error = T1_Err_Invalid_File_Format;
          goto Exit;
        }
      }

      /* now determine where to write the _encrypted_ binary private  */
      /* dictionary.  We overwrite the base dictionary for disk-based */
      /* resources and allocate a new block otherwise                 */

      size = (FT_Long)( parser->base_len - ( cur - parser->base_dict ) );

      if ( parser->in_memory )
      {
        /* note that we allocate one more byte to put a terminating `0' */
        if ( FT_ALLOC( parser->private_dict, size + 1 ) )
          goto Fail;
        parser->private_len = size;
      }
      else
      {
        parser->single_block = 1;
        parser->private_dict = parser->base_dict;
        parser->private_len  = size;
        parser->base_dict    = 0;
        parser->base_len     = 0;
      }

      /* now determine whether the private dictionary is encoded in binary */
      /* or hexadecimal ASCII format -- decode it accordingly              */

      /* we need to access the next 4 bytes (after the final \r following */
      /* the `eexec' keyword); if they all are hexadecimal digits, then   */
      /* we have a case of ASCII storage                                  */

      if ( ( hexa_value( cur[0] ) | hexa_value( cur[1] ) |
             hexa_value( cur[2] ) | hexa_value( cur[3] ) ) < 0 )

        /* binary encoding -- `simply' copy the private dict */
        FT_MEM_COPY( parser->private_dict, cur, size );

      else
      {
        /* ASCII hexadecimal encoding */

        FT_Byte*  write;
        FT_Int    count;


        write = parser->private_dict;
        count = 0;

        for ( ;cur < limit; cur++ )
        {
          int  hex1;


          /* check for newline */
          if ( cur[0] == '\r' || cur[0] == '\n' )
            continue;

          /* exit if we have a non-hexadecimal digit that isn't a newline */
          hex1 = hexa_value( cur[0] );
          if ( hex1 < 0 || cur + 1 >= limit )
            break;

          /* otherwise, store byte */
          *write++ = (FT_Byte)( ( hex1 << 4 ) | hexa_value( cur[1] ) );
          count++;
          cur++;
        }

        /* put a safeguard */
        parser->private_len = write - parser->private_dict;
        *write++ = 0;
      }
    }

    /* we now decrypt the encoded binary private dictionary */
    psaux->t1_decrypt( parser->private_dict, parser->private_len, 55665U );
    parser->root.base   = parser->private_dict;
    parser->root.cursor = parser->private_dict;
    parser->root.limit  = parser->root.cursor + parser->private_len;

  Fail:
  Exit:
    return error;
  }