sfnt.h

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  /*    PSname :: The address of a string pointer.  Will be NULL in case   */
  /*              of error, otherwise it is a pointer to the glyph name.   */
  /*                                                                       */
  /*              You must not modify the returned string!                 */
  /*                                                                       */
  /* <Output>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  typedef FT_Error
  (*TT_Get_PS_Name_Func)( TT_Face      face,
                          FT_UInt      idx,
                          FT_String**  PSname );


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    TT_Load_Metrics_Func                                               */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Load a metrics table, which is a table with a horizontal and a     */
  /*    vertical version.                                                  */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face     :: A handle to the target face object.                    */
  /*                                                                       */
  /*    stream   :: The input stream.                                      */
  /*                                                                       */
  /*    vertical :: A boolean flag.  If set, load the vertical one.        */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  typedef FT_Error
  (*TT_Load_Metrics_Func)( TT_Face    face,
                           FT_Stream  stream,
                           FT_Bool    vertical );


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    TT_Get_Metrics_Func                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Load the horizontal or vertical header in a face object.           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face     :: A handle to the target face object.                    */
  /*                                                                       */
  /*    stream   :: The input stream.                                      */
  /*                                                                       */
  /*    vertical :: A boolean flag.  If set, load vertical metrics.        */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  typedef FT_Error
  (*TT_Get_Metrics_Func)( TT_Face     face,
                          FT_Bool     vertical,
                          FT_UInt     gindex,
                          FT_Short*   abearing,
                          FT_UShort*  aadvance );


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    TT_Load_Table_Func                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Load a given TrueType table.                                       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the target face object.                      */
  /*                                                                       */
  /*    stream :: The input stream.                                        */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The function uses `face->goto_table' to seek the stream to the     */
  /*    start of the table, except while loading the font directory.       */
  /*                                                                       */
  typedef FT_Error
  (*TT_Load_Table_Func)( TT_Face    face,
                         FT_Stream  stream );


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    TT_Free_Table_Func                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Free a given TrueType table.                                       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A handle to the target face object.                        */
  /*                                                                       */
  typedef void
  (*TT_Free_Table_Func)( TT_Face  face );


  /*
   * @functype:
   *    TT_Face_GetKerningFunc
   *
   * @description:
   *    Return the horizontal kerning value between two glyphs.
   *
   * @input:
   *    face        :: A handle to the source face object.
   *    left_glyph  :: The left glyph index.
   *    right_glyph :: The right glyph index.
   *
   * @return:
   *    The kerning value in font units.
   */
  typedef FT_Int
  (*TT_Face_GetKerningFunc)( TT_Face  face,
                             FT_UInt  left_glyph,
                             FT_UInt  right_glyph );


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    SFNT_Interface                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This structure holds pointers to the functions used to load and    */
  /*    free the basic tables that are required in a `sfnt' font file.     */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    Check the various xxx_Func() descriptions for details.             */
  /*                                                                       */
  typedef struct  SFNT_Interface_
  {
    TT_Loader_GotoTableFunc      goto_table;

    TT_Init_Face_Func            init_face;
    TT_Load_Face_Func            load_face;
    TT_Done_Face_Func            done_face;
    FT_Module_Requester          get_interface;

    TT_Load_Any_Func             load_any;

#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
    TT_Load_SFNT_HeaderRec_Func  load_sfnt_header;
    TT_Load_Directory_Func       load_directory;
#endif

    /* these functions are called by `load_face' but they can also  */
    /* be called from external modules, if there is a need to do so */
    TT_Load_Table_Func           load_head;
    TT_Load_Metrics_Func         load_hhea;
    TT_Load_Table_Func           load_cmap;
    TT_Load_Table_Func           load_maxp;
    TT_Load_Table_Func           load_os2;
    TT_Load_Table_Func           load_post;

    TT_Load_Table_Func           load_name;
    TT_Free_Table_Func           free_name;

    /* optional tables */
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
    TT_Load_Table_Func           load_hdmx_stub;
    TT_Free_Table_Func           free_hdmx_stub;
#endif

    /* this field was called `load_kerning' up to version 2.1.10 */
    TT_Load_Table_Func           load_kern;

    TT_Load_Table_Func           load_gasp;
    TT_Load_Table_Func           load_pclt;

    /* see `ttload.h'; this field was called `load_bitmap_header' up to */
    /* version 2.1.10                                                   */
    TT_Load_Table_Func           load_bhed;

#ifdef FT_CONFIG_OPTION_OLD_INTERNALS

    /* see `ttsbit.h' */
    TT_Set_SBit_Strike_OldFunc   set_sbit_strike_stub;
    TT_Load_Table_Func           load_sbits_stub;

    /*
     *  The following two fields appeared in version 2.1.8, and were placed
     *  between `load_sbits' and `load_sbit_image'.  We support them as a
     *  special exception since they are used by Xfont library within the
     *  X.Org xserver, and because the probability that other rogue clients
     *  use the other version 2.1.7 fields below is _extremely_ low.
     *
     *  Note that this forces us to disable an interesting memory-saving
     *  optimization though...
     */

    TT_Find_SBit_Image_Func      find_sbit_image;
    TT_Load_SBit_Metrics_Func    load_sbit_metrics;

#endif

    TT_Load_SBit_Image_Func      load_sbit_image;

#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
    TT_Free_Table_Func           free_sbits_stub;
#endif

    /* see `ttpost.h' */
    TT_Get_PS_Name_Func          get_psname;
    TT_Free_Table_Func           free_psnames;

#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
    TT_CharMap_Load_Func         load_charmap_stub;
    TT_CharMap_Free_Func         free_charmap_stub;
#endif

    /* starting here, the structure differs from version 2.1.7 */

    /* this field was introduced in version 2.1.8, named `get_psname' */
    TT_Face_GetKerningFunc       get_kerning;

    /* new elements introduced after version 2.1.10 */

    /* load the font directory, i.e., the offset table and */
    /* the table directory                                 */
    TT_Load_Table_Func           load_font_dir;
    TT_Load_Metrics_Func         load_hmtx;

    TT_Load_Table_Func           load_eblc;
    TT_Free_Table_Func           free_eblc;

    TT_Set_SBit_Strike_Func      set_sbit_strike;
    TT_Load_Strike_Metrics_Func  load_strike_metrics;

    TT_Get_Metrics_Func          get_metrics;

  } SFNT_Interface;


  /* transitional */
  typedef SFNT_Interface*   SFNT_Service;


FT_END_HEADER

#endif /* __SFNT_H__ */


/* END */