cffdrivr.c

source code: Covert TXT to PDF

    Exit:
      return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    cff_get_char_index                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Uses a charmap to return a given character code's glyph index.     */
  /*                                                                       */
  /* <Input>                                                               */
  /*    charmap  :: A handle to the source charmap object.                 */
  /*    charcode :: The character code.                                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Glyph index.  0 means `undefined character code'.                  */
  /*                                                                       */
  static FT_UInt
  cff_get_char_index( TT_CharMap  charmap,
                      FT_Long     charcode )
  {
    FT_Error       error;
    CFF_Face       face;
    TT_CMapTable*  cmap;


    cmap = &charmap->cmap;
    face = (CFF_Face)charmap->root.face;

    /* Load table if needed */
    if ( !cmap->loaded )
    {
      SFNT_Interface*  sfnt = (SFNT_Interface*)face->sfnt;


      error = sfnt->load_charmap( face, cmap, face->root.stream );
      if ( error )
        return 0;

      cmap->loaded = TRUE;
    }

    return ( cmap->get_index ? cmap->get_index( cmap, charcode ) : 0 );
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    cff_get_next_char                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Uses a charmap to return the next encoded charcode.                */
  /*                                                                       */
  /* <Input>                                                               */
  /*    charmap  :: A handle to the source charmap object.                 */
  /*    charcode :: The character code.                                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Char code.  0 means `no encoded chars above the given one'.        */
  /*                                                                       */
  static FT_Long
  cff_get_next_char( TT_CharMap  charmap,
                     FT_Long     charcode )
  {
    FT_Error       error;
    CFF_Face       face;
    TT_CMapTable*  cmap;


    cmap = &charmap->cmap;
    face = (CFF_Face)charmap->root.face;

    /* Load table if needed */
    if ( !cmap->loaded )
    {
      SFNT_Interface*  sfnt = (SFNT_Interface*)face->sfnt;


      error = sfnt->load_charmap( face, cmap, face->root.stream );
      if ( error )
        return 0;

      cmap->loaded = TRUE;
    }

    return ( cmap->get_next_char ? cmap->get_next_char( cmap, charcode ) : 0 );
  }


  /*************************************************************************/
  /*                                                                       */
  /* <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_Interface*  psnames;
    FT_Memory           memory = FT_FACE_MEMORY( face );
    FT_String*          name;
    FT_UShort           sid;
    FT_UInt             i;
    FT_Int              result;


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

    psnames = (PSNames_Interface*)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_Get_Name( &cff->string_index, sid - 391 );
      else
        name = (FT_String *)psnames->adobe_std_strings( sid );

      result = strcmp( glyph_name, name );

      if ( sid > 390 )
        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*  interface )
  {
    FT_Module  sfnt;

#ifndef FT_CONFIG_OPTION_NO_GLYPH_NAMES

    if ( strcmp( (const char*)interface, "glyph_name" ) == 0 )
      return (FT_Module_Interface)cff_get_glyph_name;

    if ( strcmp( (const char*)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, interface ) : 0;
  }


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

  FT_CALLBACK_TABLE_DEF
  const FT_Driver_Class  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 ),

    (FTDriver_initFace)     CFF_Face_Init,
    (FTDriver_doneFace)     CFF_Face_Done,
    (FTDriver_initSize)     CFF_Size_Init,
    (FTDriver_doneSize)     CFF_Size_Done,
    (FTDriver_initGlyphSlot)CFF_GlyphSlot_Init,
    (FTDriver_doneGlyphSlot)CFF_GlyphSlot_Done,

    (FTDriver_setCharSizes) CFF_Size_Reset,
    (FTDriver_setPixelSizes)CFF_Size_Reset,

    (FTDriver_loadGlyph)    Load_Glyph,
    (FTDriver_getCharIndex) cff_get_char_index,

    (FTDriver_getKerning)   Get_Kerning,
    (FTDriver_attachFile)   0,
    (FTDriver_getAdvances)  0,
    
    (FTDriver_getNextChar)  cff_get_next_char
  };


#ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    getDriverClass                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This function is used when compiling the TrueType driver as a      */
  /*    shared library (`.DLL' or `.so').  It will be used by the          */
  /*    high-level library of FreeType to retrieve the address of the      */
  /*    driver's generic interface.                                        */
  /*                                                                       */
  /*    It shouldn't be implemented in a static build, as each driver must */
  /*    have the same function as an exported entry point.                 */
  /*                                                                       */
  /* <Return>                                                              */
  /*    The address of the TrueType's driver generic interface.  The       */
  /*    format-specific interface can then be retrieved through the method */
  /*    interface->get_format_interface.                                   */
  /*                                                                       */
  FT_EXPORT_DEF( const FT_Driver_Class* )
  getDriverClass( void )
  {
    return &cff_driver_class;
  }


#endif /* CONFIG_OPTION_DYNAMIC_DRIVERS */


/* END */