t1driver.c

Qt/Embedded是一个多平台的C++图形用户界面应用程序框架

         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;
  }


  static
  T1_Error   Init_Face( FT_Stream  stream,
                        FT_Int     face_index,
                        T1_Face    face )
  {
    T1_Error  error;
    
    error = T1_Init_Face(stream, face_index, face);
    if (!error)
    {
      FT_Face      root    = &face->root;
      FT_CharMap   charmap = face->charmaprecs;

      /* synthetize a Unicode charmap if there is support in the "psnames" */
      /* module..                                                          */
      if (face->psnames)
      {
        PSNames_Interface*  psnames = (PSNames_Interface*)face->psnames;
        if (psnames->unicode_value)
        {
          error = psnames->build_unicodes( root->memory,
                                           face->type1.num_glyphs,
                                           (const char**)face->type1.glyph_names,
                                           &face->unicode_map );
          if (!error)
          {
            root->charmap        = charmap;
            charmap->face        = (FT_Face)face;
            charmap->encoding    = ft_encoding_unicode;
            charmap->platform_id = 3;
            charmap->encoding_id = 1;
            charmap++;
          }
          
          /* simply clear the error in case of failure (which really) */
          /* means that out of memory or no unicode glyph names       */
          error = 0;
        }
      }

      /* now, support either the standard, expert, or custom encodings */
      charmap->face        = (FT_Face)face;
      charmap->platform_id = 7;  /* a new platform id for Adobe fonts ?? */
      
      switch (face->type1.encoding_type)
      {
        case t1_encoding_standard:
          charmap->encoding    = ft_encoding_adobe_standard;
          charmap->encoding_id = 0;
          break;
        
        case t1_encoding_expert:
          charmap->encoding    = ft_encoding_adobe_expert;
          charmap->encoding_id = 1;
          break;
        
        default:
          charmap->encoding    = ft_encoding_adobe_custom;
          charmap->encoding_id = 2;
          break;
      }
      
      root->charmaps = face->charmaps;
      root->num_charmaps = charmap - face->charmaprecs + 1;
      face->charmaps[0] = &face->charmaprecs[0];
      face->charmaps[1] = &face->charmaprecs[1];
    }
    return error;
  }

  /******************************************************************/
  /*                                                                */
  /* <Struct> FT_DriverInterface                                    */
  /*                                                                */
  /* <Description>                                                  */
  /*    A structure used to hold a font driver's basic interface    */
  /*    used by the high-level parts of FreeType (or other apps)    */
  /*                                                                */
  /*    Most scalable drivers provide a specialized interface to    */
  /*    access format-specific features. It can be retrieved with   */
  /*    a call to the "get_format_interface", and should be defined */
  /*    in each font driver header (e.g. ttdriver.h, t1driver.h,..) */
  /*                                                                */
  /*    All fields are function pointers ..                         */
  /*                                                                */
  /*                                                                */
  /* <Fields>                                                       */
  /*                                                                */
  /*    new_engine ::                                               */
  /*        used to create and initialise a new driver object       */
  /*                                                                */
  /*    done_engine ::                                              */
  /*        used to finalise and destroy a given driver object      */
  /*                                                                */
  /*    get_format_interface ::                                     */
  /*        return a typeless pointer to the format-specific        */
  /*        driver interface.                                       */
  /*                                                                */
  /*    new_face ::                                                 */
  /*        create a new face object from a resource                */
  /*                                                                */
  /*    done_face ::                                                */
  /*        discards a face object, as well as all child objects    */
  /*        ( sizes, charmaps, glyph slots )                        */
  /*                                                                */
  /*    get_face_properties ::                                      */
  /*        return generic face properties                          */
  /*                                                                */
  /*    get_kerning ::                                              */
  /*        return the kerning vector corresponding to a pair       */
  /*        of glyphs, expressed in unscaled font units.            */
  /*                                                                */
  /*    new_size ::                                                 */
  /*        create and initialise a new scalable size object.       */
  /*                                                                */
  /*    new_fixed_size ::                                           */
  /*        create and initialise a new fixed-size object.          */
  /*                                                                */
  /*    done_size ::                                                */
  /*        finalize a given face size object.                      */
  /*                                                                */
  /*    set_size_resolutions ::                                     */
  /*        reset a scalable size object's output resolutions       */
  /*                                                                */
  /*    set_size_char_sizes ::                                      */
  /*        reset a scalable size object's character size           */
  /*                                                                */
  /*    set_pixel_sizes ::                                          */
  /*        reset a face size object's pixel dimensions. Applies    */
  /*        to both scalable and fixed faces.                       */
  /*                                                                */
  /*    new_glyph_slot ::                                           */
  /*        create and initialise a new glyph slot                  */
  /*                                                                */
  /*    done_glyph_slot ::                                          */
  /*        discard a given glyph slot                              */
  /*                                                                */
  /*    load_glyph ::                                               */
  /*        load a given glyph into a given slot                    */
  /*                                                                */
  /*    get_glyph_metrics ::                                        */
  /*        return a loaded glyph's metrics.                        */
  /*                                                                */

  EXPORT_FUNC
  const  FT_DriverInterface  t1z_driver_interface =
  {
    sizeof( FT_DriverRec ),
    sizeof( T1_FaceRec ),
    sizeof( T1_SizeRec ),
    sizeof( T1_GlyphSlotRec ),
    
    "type1",
    100,
    200,

    0,   /* format interface */

    (FTDriver_initDriver)           T1_Init_Driver,
    (FTDriver_doneDriver)           T1_Done_Driver,

#ifdef T1_CONFIG_OPTION_NO_AFM
    (FTDriver_getInterface)         0,
#else
    (FTDriver_getInterface)         Get_Interface,
#endif

    (FTDriver_initFace)             Init_Face,
    (FTDriver_doneFace)             T1_Done_Face,

#ifdef T1_CONFIG_OPTION_NO_AFM    
    (FTDriver_getKerning)           0,
#else
    (FTDriver_getKerning)           Get_Kerning,
#endif

    (FTDriver_initSize)             T1_Init_Size,
    (FTDriver_doneSize)             T1_Done_Size,
    (FTDriver_setCharSizes)         Set_Char_Sizes,
    (FTDriver_setPixelSizes)        Set_Pixel_Sizes,

    (FTDriver_initGlyphSlot)        T1_Init_GlyphSlot,
    (FTDriver_doneGlyphSlot)        T1_Done_GlyphSlot,
    (FTDriver_loadGlyph)            T1_Load_Glyph,

    (FTDriver_getCharIndex)         Get_Char_Index,
  };


  /******************************************************************/
  /*                                                                */
  /*  <Function> Get_FreeType_Driver_Interface                      */
  /*                                                                */
  /*  <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>                                                      */
  /*     address of TrueType's driver generic interface. The        */
  /*     forma-specific interface can then be retrieved through     */
  /*     the method interface->get_format_interface..               */
  /*                                                                */

#ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
  
  EXPORT_FUNC
  FT_DriverInterface*  getDriverInterface( void )
  {
    return &t1_driver_interface;
  }
  
#endif /* FT_CONFIG_OPTION_DYNAMIC_DRIVERS */