t2objs.c

qt-embedded-2.3.8.tar.gz源码

        FT_TRACE2(( "[not a valid OpenType/CFF font]\n" ));
        goto Bad_Format;
      }

      /* If we are performing a simple font format check, exit immediately */
      if ( face_index < 0 )
        return T2_Err_Ok;

      sfnt_format = 1;

      /* now, the font can be either an OpenType/CFF font, or a SVG CEF */
      /* font in the later case; it doesn't have a `head' table         */
      error = face->goto_table( face, TTAG_head, stream, 0 );
      if ( !error )
      {
        pure_cff = 0;

        /* Load font directory */
        error = sfnt->load_face( stream, face,
                                 face_index, num_params, params );
        if ( error )
          goto Exit;
      }
      else
      {
        /* load the `cmap' table by hand */
        error = sfnt->load_charmaps( face, stream );
        if ( error )
          goto Exit;

        /* XXX: for now, we don't load the GPOS table, as OpenType Layout */
        /* support will be added later to FreeType 2 as a separate module */
      }

      /* now, load the CFF part of the file */
      error = face->goto_table( face, TTAG_CFF, stream, 0 );
      if ( error )
        goto Exit;
    }
    else
    {
      /* rewind to start of file; we are going to load a pure-CFF font */
      if ( FILE_Seek( 0 ) )
        goto Exit;
      error = FT_Err_Ok;
    }

    /* now load and parse the CFF table in the file */
    {
      CFF_Font*  cff;
      FT_Memory  memory = face->root.memory;
      FT_Face    root;
      FT_UInt    flags;
      FT_ULong   base_offset;


      if ( ALLOC( cff, sizeof ( *cff ) ) )
        goto Exit;

      base_offset = FILE_Pos();

      face->extra.data = cff;
      error = T2_Load_CFF_Font( stream, face_index, cff );
      if ( error )
        goto Exit;

      /* Complement the root flags with some interesting information. */
      /* Note that this is only necessary for pure CFF and CEF fonts  */

      root = &face->root;
      if ( pure_cff )
      {
        CFF_Font_Dict*  dict = &cff->top_font.font_dict;


        /* we need the `PSNames' module for pure-CFF and CEF formats */
        if ( !psnames )
        {
          FT_ERROR(( "T2_Init_Face:" ));
          FT_ERROR(( " cannot open CFF & CEF fonts\n" ));
          FT_ERROR(( "             " ));
          FT_ERROR(( " without the `PSNames' module\n" ));
          goto Bad_Format;
        }

        /* Set up num_faces. */
        root->num_faces = cff->num_faces;

        /* compute number of glyphs */
        if ( dict->cid_registry )
          root->num_glyphs = dict->cid_count;
        else
          root->num_glyphs = cff->charstrings_index.count;

        /* set global bbox, as well as EM size */
        root->units_per_EM = 1000;
        root->bbox         = dict->font_bbox;
        root->ascender     = (FT_Short)root->bbox.yMax;
        root->descender    = (FT_Short)root->bbox.yMin;
        root->height       = ( ( root->ascender - root->descender ) * 12 ) / 10;

        /* retrieve font family & style name */
        root->family_name = T2_Get_Name( &cff->name_index, face_index );
        if ( dict->cid_registry )
        {
          root->style_name = T2_StrCopy( memory, "Regular" );  /* XXXX */
        }
        else
        {
          root->style_name = T2_Get_String( &cff->string_index,
                                            dict->weight,
                                            psnames );
        }

        /*******************************************************************/
        /*                                                                 */
        /* Compute face flags.                                             */
        /*                                                                 */
        flags = FT_FACE_FLAG_SCALABLE  |    /* scalable outlines */
                FT_FACE_FLAG_HORIZONTAL;    /* horizontal data   */

        if ( sfnt_format )
          flags |= FT_FACE_FLAG_SFNT;

        /* fixed width font? */
        if ( dict->is_fixed_pitch )
          flags |= FT_FACE_FLAG_FIXED_WIDTH;

/* XXXX: WE DO NOT SUPPORT KERNING METRICS IN THE GPOS TABLE FOR NOW */
#if 0
        /* kerning available? */
        if ( face->kern_pairs )
          flags |= FT_FACE_FLAG_KERNING;
#endif

        root->face_flags = flags;

        /*******************************************************************/
        /*                                                                 */
        /* Compute style flags.                                            */
        /*                                                                 */
        flags = 0;

        if ( dict->italic_angle )
          flags |= FT_STYLE_FLAG_ITALIC;

        /* XXX: may not be correct */
        if ( cff->top_font.private_dict.force_bold )
          flags |= FT_STYLE_FLAG_BOLD;

        root->style_flags = flags;

        /* set the charmaps if any */
        if ( sfnt_format )
        {
          /*****************************************************************/
          /*                                                               */
          /* Polish the charmaps.                                          */
          /*                                                               */
          /*   Try to set the charmap encoding according to the platform & */
          /*   encoding ID of each charmap.                                */
          /*                                                               */
          TT_CharMap  charmap;
          FT_Int      n;


          charmap            = face->charmaps;
          root->num_charmaps = face->num_charmaps;

          /* allocate table of pointers */
          if ( ALLOC_ARRAY( root->charmaps, root->num_charmaps, FT_CharMap ) )
            goto Exit;

          for ( n = 0; n < root->num_charmaps; n++, charmap++ )
          {
            FT_Int  platform = charmap->cmap.platformID;
            FT_Int  encoding = charmap->cmap.platformEncodingID;


            charmap->root.face        = (FT_Face)face;
            charmap->root.platform_id = platform;
            charmap->root.encoding_id = encoding;
            charmap->root.encoding    = find_encoding( platform, encoding );

            /* now, set root->charmap with a unicode charmap */
            /* wherever available                            */
            if ( !root->charmap                                &&
                 charmap->root.encoding == ft_encoding_unicode )
              root->charmap = (FT_CharMap)charmap;

            root->charmaps[n] = (FT_CharMap)charmap;
          }
        }
      }
    }

  Exit:
    return error;

  Bad_Format:
    error = FT_Err_Unknown_File_Format;
    goto Exit;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    T2_Done_Face                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finalizes a given face object.                                     */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A pointer to the face object to destroy.                   */
  /*                                                                       */
  FT_LOCAL
  void  T2_Done_Face( T2_Face  face )
  {
    FT_Memory        memory = face->root.memory;
    SFNT_Interface*  sfnt   = (SFNT_Interface*)face->sfnt;


    if ( sfnt )
      sfnt->done_face( face );

    {
      CFF_Font*  cff = (CFF_Font*)face->extra.data;


      if ( cff )
      {
        T2_Done_CFF_Font( cff );
        FREE( face->extra.data );
      }
    }
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    T2_Init_Driver                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a given OpenType driver object.                        */
  /*                                                                       */
  /* <Input>                                                               */
  /*    driver :: A handle to the target driver object.                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF
  FT_Error  T2_Init_Driver( T2_Driver  driver )
  {
    /* init extension registry if needed */

#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE

    return TT_Init_Extensions( driver );

#else

    FT_UNUSED( driver );

    return T2_Err_Ok;

#endif
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    T2_Done_Driver                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finalizes a given OpenType driver.                                 */
  /*                                                                       */
  /* <Input>                                                               */
  /*    driver :: A handle to the target OpenType driver.                  */
  /*                                                                       */
  FT_LOCAL_DEF
  void  T2_Done_Driver( T2_Driver  driver )
  {
    /* destroy extensions registry if needed */

#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE

    TT_Done_Extensions( driver );

#else

    FT_UNUSED( driver );

#endif
  }


/* END */