t1driver.c

一个Xpdf应用的例子

    face    = (T1_Face)charmap->face;
    psnames = (PSNames_Interface*)face->psnames;
    if ( psnames )
      switch ( charmap->encoding )
      {
        /*******************************************************************/
        /*                                                                 */
        /* Unicode encoding support                                        */
        /*                                                                 */
      case ft_encoding_unicode:
        /* use the `PSNames' module to synthetize the Unicode charmap */
        result = psnames->lookup_unicode( &face->unicode_map,
                                          (FT_ULong)charcode );

        /* the function returns 0xFFFF if the Unicode charcode has */
        /* no corresponding glyph                                  */
        if ( result == 0xFFFF )
          result = 0;
        goto Exit;

        /*******************************************************************/
        /*                                                                 */
        /* Custom Type 1 encoding                                          */
        /*                                                                 */
      case ft_encoding_adobe_custom:
        {
          T1_Encoding*  encoding = &face->type1.encoding;


          if ( charcode >= encoding->code_first &&
               charcode <= encoding->code_last  )
            result = encoding->char_index[charcode];
          goto Exit;
        }

        /*******************************************************************/
        /*                                                                 */
        /* Adobe Standard & Expert encoding support                        */
        /*                                                                 */
      default:
        if ( charcode < 256 )
        {
          FT_UInt      code;
          FT_Int       n;
          const char*  glyph_name;


          code = psnames->adobe_std_encoding[charcode];
          if ( charmap->encoding == ft_encoding_adobe_expert )
            code = psnames->adobe_expert_encoding[charcode];

          glyph_name = psnames->adobe_std_strings( code );
          if ( !glyph_name )
            break;

          for ( n = 0; n < face->type1.num_glyphs; n++ )
          {
            const char*  gname = face->type1.glyph_names[n];


            if ( gname && gname[0] == glyph_name[0] &&
                 strcmp( gname, glyph_name ) == 0   )
            {
              result = n;
              break;
            }
          }
        }
      }
  Exit:
    return result;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    Get_Next_Char                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Uses a charmap to return the next encoded char.                    */
  /*                                                                       */
  /* <Input>                                                               */
  /*    charmap  :: A handle to the source charmap object.                 */
  /*    charcode :: The character code.                                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Next char code.  0 means `no more char codes'.                     */
  /*                                                                       */
  static FT_Long
  Get_Next_Char( FT_CharMap  charmap,
                 FT_Long     charcode )
  {
    T1_Face             face;
    PSNames_Interface*  psnames;


    face    = (T1_Face)charmap->face;
    psnames = (PSNames_Interface*)face->psnames;

    if ( psnames )
      switch ( charmap->encoding )
      {
        /*******************************************************************/
        /*                                                                 */
        /* Unicode encoding support                                        */
        /*                                                                 */
      case ft_encoding_unicode:
        /* use the `PSNames' module to synthetize the Unicode charmap */
        return psnames->next_unicode( &face->unicode_map,
                                      (FT_ULong)charcode );

        /*******************************************************************/
        /*                                                                 */
        /* Custom Type 1 encoding                                          */
        /*                                                                 */
      case ft_encoding_adobe_custom:
        {
          T1_Encoding*  encoding = &face->type1.encoding;


          charcode++;
          if ( charcode < encoding->code_first )
            charcode = encoding->code_first;
          while ( charcode <= encoding->code_last  )
          {
            if ( encoding->char_index[charcode] )
              return charcode;
            charcode++;
          }
        }

        /*******************************************************************/
        /*                                                                 */
        /* Adobe Standard & Expert encoding support                        */
        /*                                                                 */
      default:
        while ( ++charcode < 256 )
        {
          FT_UInt      code;
          FT_Int       n;
          const char*  glyph_name;


          code = psnames->adobe_std_encoding[charcode];
          if ( charmap->encoding == ft_encoding_adobe_expert )
            code = psnames->adobe_expert_encoding[charcode];

          glyph_name = psnames->adobe_std_strings( code );
          if ( !glyph_name )
            continue;

          for ( n = 0; n < face->type1.num_glyphs; n++ )
          {
            const char*  gname = face->type1.glyph_names[n];


            if ( gname && gname[0] == glyph_name[0] &&
                 strcmp( gname, glyph_name ) == 0   )
              return charcode;
          }
        }
      }

    return 0;
  }


  FT_CALLBACK_TABLE_DEF
  const FT_Driver_Class  t1_driver_class =
  {
    {
      ft_module_font_driver      |
      ft_module_driver_scalable  | 
      ft_module_driver_has_hinter,
      
      sizeof( FT_DriverRec ),

      "type1",
      0x10000L,
      0x20000L,

      0,   /* format interface */

      (FT_Module_Constructor)T1_Driver_Init,
      (FT_Module_Destructor) T1_Driver_Done,
      (FT_Module_Requester)  Get_Interface,
    },

    sizeof( T1_FaceRec ),
    sizeof( T1_SizeRec ),
    sizeof( T1_GlyphSlotRec ),

    (FTDriver_initFace)     T1_Face_Init,
    (FTDriver_doneFace)     T1_Face_Done,
    (FTDriver_initSize)     T1_Size_Init,
    (FTDriver_doneSize)     T1_Size_Done,
    (FTDriver_initGlyphSlot)T1_GlyphSlot_Init,
    (FTDriver_doneGlyphSlot)T1_GlyphSlot_Done,

    (FTDriver_setCharSizes) T1_Size_Reset,
    (FTDriver_setPixelSizes)T1_Size_Reset,
    (FTDriver_loadGlyph)    T1_Load_Glyph,
    (FTDriver_getCharIndex) Get_Char_Index,

#ifdef T1_CONFIG_OPTION_NO_AFM
    (FTDriver_getKerning)   0,
    (FTDriver_attachFile)   0,
#else
    (FTDriver_getKerning)   Get_Kerning,
    (FTDriver_attachFile)   T1_Read_AFM,
#endif
    (FTDriver_getAdvances)  0,
    
    (FTDriver_getNextChar)  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 &t1_driver_class;
  }


#endif /* FT_CONFIG_OPTION_DYNAMIC_DRIVERS */


/* END */