cffdrivr.c

下载来的一个看图软件的源代码

  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****             C H A R A C T E R   M A P P I N G S                 ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/

  static FT_Error
  cff_get_glyph_name( CFF_Face    face,
                      FT_UInt     glyph_index,
                      FT_Pointer  buffer,
                      FT_UInt     buffer_max )
  {
    CFF_Font         font   = (CFF_Font)face->extra.data;
    FT_Memory        memory = FT_FACE_MEMORY( face );
    FT_String*       gname;
    FT_UShort        sid;
    PSNames_Service  psnames;
    FT_Error         error;


    psnames = (PSNames_Service)FT_Get_Module_Interface(
                face->root.driver->root.library, "psnames" );

    if ( !psnames )
    {
      FT_ERROR(( "cff_get_glyph_name:" ));
      FT_ERROR(( " cannot open CFF & CEF fonts\n" ));
      FT_ERROR(( "                   " ));
      FT_ERROR(( " without the `PSNames' module\n" ));
      error = CFF_Err_Unknown_File_Format;
      goto Exit;
    }

    /* first, locate the sid in the charset table */
    sid = font->charset.sids[glyph_index];

    /* now, lookup the name itself */
    gname = cff_index_get_sid_string( &font->string_index, sid, psnames );

    if ( gname && buffer_max > 0 )
    {
      FT_UInt  len = (FT_UInt)ft_strlen( gname );


      if ( len >= buffer_max )
        len = buffer_max - 1;

      FT_MEM_COPY( buffer, gname, len );
      ((FT_Byte*)buffer)[len] = 0;
    }

    FT_FREE( gname );
    error = CFF_Err_Ok;

    Exit:
      return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    cff_get_name_index                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Uses the psnames module and the CFF font's charset to to return a  */
  /*    a given glyph name's glyph index.                                  */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face       :: A handle to the source face object.                  */
  /*                                                                       */
  /*    glyph_name :: The glyph name.                                      */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Glyph index.  0 means `undefined character code'.                  */
  /*                                                                       */
  static FT_UInt
  cff_get_name_index( CFF_Face    face,
                      FT_String*  glyph_name )
  {
    CFF_Font         cff;
    CFF_Charset      charset;
    PSNames_Service  psnames;
    FT_Memory        memory = FT_FACE_MEMORY( face );
    FT_String*       name;
    FT_UShort        sid;
    FT_UInt          i;
    FT_Int           result;


    cff     = (CFF_FontRec *)face->extra.data;
    charset = &cff->charset;

    psnames = (PSNames_Service)FT_Get_Module_Interface(
                face->root.driver->root.library, "psnames" );

    for ( i = 0; i < cff->num_glyphs; i++ )
    {
      sid = charset->sids[i];

      if ( sid > 390 )
        name = cff_index_get_name( &cff->string_index, sid - 391 );
      else
        name = (FT_String *)psnames->adobe_std_strings( sid );

      result = ft_strcmp( glyph_name, name );

      if ( sid > 390 )
        FT_FREE( name );

      if ( !result )
        return i;
    }

    return 0;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****                D R I V E R  I N T E R F A C E                   ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/

  static FT_Module_Interface
  cff_get_interface( CFF_Driver   driver,
                     const char*  module_interface )
  {
    FT_Module  sfnt;


#ifndef FT_CONFIG_OPTION_NO_GLYPH_NAMES

    if ( ft_strcmp( (const char*)module_interface, "glyph_name" ) == 0 )
      return (FT_Module_Interface)cff_get_glyph_name;

    if ( ft_strcmp( (const char*)module_interface, "name_index" ) == 0 )
      return (FT_Module_Interface)cff_get_name_index;

#endif

    /* we simply pass our request to the `sfnt' module */
    sfnt = FT_Get_Module( driver->root.root.library, "sfnt" );

    return sfnt ? sfnt->clazz->get_interface( sfnt, module_interface ) : 0;
  }


  /* The FT_DriverInterface structure is defined in ftdriver.h. */

  FT_CALLBACK_TABLE_DEF
  const FT_Driver_ClassRec  cff_driver_class =
  {
    /* begin with the FT_Module_Class fields */
    {
      FT_MODULE_FONT_DRIVER       |
      FT_MODULE_DRIVER_SCALABLE   |
      FT_MODULE_DRIVER_HAS_HINTER,

      sizeof( CFF_DriverRec ),
      "cff",
      0x10000L,
      0x20000L,

      0,   /* module-specific interface */

      (FT_Module_Constructor)cff_driver_init,
      (FT_Module_Destructor) cff_driver_done,
      (FT_Module_Requester)  cff_get_interface,
    },

    /* now the specific driver fields */
    sizeof( TT_FaceRec ),
    sizeof( FT_SizeRec ),
    sizeof( CFF_GlyphSlotRec ),

    (FT_Face_InitFunc)       cff_face_init,
    (FT_Face_DoneFunc)       cff_face_done,
    (FT_Size_InitFunc)       cff_size_init,
    (FT_Size_DoneFunc)       cff_size_done,
    (FT_Slot_InitFunc)       cff_slot_init,
    (FT_Slot_DoneFunc)       cff_slot_done,

    (FT_Size_ResetPointsFunc)cff_size_reset,
    (FT_Size_ResetPixelsFunc)cff_size_reset,

    (FT_Slot_LoadFunc)       Load_Glyph,

    (FT_Face_GetKerningFunc) Get_Kerning,
    (FT_Face_AttachFunc)     0,
    (FT_Face_GetAdvancesFunc)0,
  };


/* END */