sfnt.h

支持ttf字体转换的工具

  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    TT_CharMap_Load_Func                                               */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads a given TrueType character map into memory.                  */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the parent face object.                      */
  /*                                                                       */
  /*    stream :: A handle to the current stream object.                   */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    cmap   :: A pointer to a cmap object.                              */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The function assumes that the stream is already in use (i.e.,      */
  /*    opened).  In case of error, all partially allocated tables are     */
  /*    released.                                                          */
  /*                                                                       */
  typedef FT_Error
  (*TT_CharMap_Load_Func)( TT_Face       face,
                           TT_CMapTable  cmap,
                           FT_Stream     input );


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    TT_CharMap_Free_Func                                               */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Destroys a character mapping table.                                */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A handle to the parent face object.                        */
  /*                                                                       */
  /*    cmap :: A handle to a cmap object.                                 */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  typedef FT_Error
  (*TT_CharMap_Free_Func)( TT_Face       face,
                           TT_CMapTable  cmap );


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    TT_Load_Table_Func                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads 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 will use `face->goto_table' to seek the stream to     */
  /*    the start of the table.                                            */
  /*                                                                       */
  typedef FT_Error
  (*TT_Load_Table_Func)( TT_Face    face,
                         FT_Stream  stream );


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


  /*************************************************************************/
  /*                                                                       */
  /* <FuncType>                                                            */
  /*    SFNT_Load_Table_Func                                               */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Loads a given SFNT table in memory                                 */
  /*                                                                       */
  typedef FT_Error
  (*SFNT_Load_Table_Func)( FT_Face      face,
                           FT_ULong     tag,
                           FT_Long      offset,
                           FT_Byte*     buffer,
                           FT_ULong*    length );

  /*************************************************************************/
  /*                                                                       */
  /* <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;
    SFNT_Get_Interface_Func      get_interface;

    TT_Load_Any_Func             load_any;
    TT_Load_SFNT_HeaderRec_Func  load_sfnt_header;
    TT_Load_Directory_Func       load_directory;

    /* 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_header;
    TT_Load_Metrics_Func         load_metrics;
    TT_Load_Table_Func           load_charmaps;
    TT_Load_Table_Func           load_max_profile;
    TT_Load_Table_Func           load_os2;
    TT_Load_Table_Func           load_psnames;

    TT_Load_Table_Func           load_names;
    TT_Free_Table_Func           free_names;

    /* optional tables */
    TT_Load_Table_Func           load_hdmx;
    TT_Free_Table_Func           free_hdmx;

    TT_Load_Table_Func           load_kerning;
    TT_Load_Table_Func           load_gasp;
    TT_Load_Table_Func           load_pclt;

    /* see `ttload.h' */
    TT_Load_Table_Func           load_bitmap_header;

    /* see `ttsbit.h' */
    TT_Set_SBit_Strike_Func      set_sbit_strike;
    TT_Load_Table_Func           load_sbits;
    TT_Load_SBit_Image_Func      load_sbit_image;
    TT_Free_Table_Func           free_sbits;

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

    /* see `ttcmap.h' */
    TT_CharMap_Load_Func         load_charmap;
    TT_CharMap_Free_Func         free_charmap;

  } SFNT_Interface;


  /* transitional */
  typedef SFNT_Interface*   SFNT_Service;


FT_END_HEADER

#endif /* __SFNT_H__ */


/* END */