ftobjs.h

一个Xpdf应用的例子

  /* typecast a module into a driver easily */
#define FT_DRIVER( x )        ((FT_Driver)(x))

  /* typecast a module as a driver, and get its driver class */
#define FT_DRIVER_CLASS( x )  FT_DRIVER( x )->clazz


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_DriverRec                                                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The root font driver class.  A font driver is responsible for      */
  /*    managing and loading font files of a given format.                 */
  /*                                                                       */
  /*  <Fields>                                                             */
  /*     root         :: Contains the fields of the root module class.     */
  /*                                                                       */
  /*     clazz        :: A pointer to the font driver's class.  Note that  */
  /*                     this is NOT root.clazz.  `class' wasn't used      */
  /*                     as it is a reserved word in C++.                  */
  /*                                                                       */
  /*     faces_list   :: The list of faces currently opened by this        */
  /*                     driver.                                           */
  /*                                                                       */
  /*     extensions   :: A typeless pointer to the driver's extensions     */
  /*                     registry, if they are supported through the       */
  /*                     configuration macro FT_CONFIG_OPTION_EXTENSIONS.  */
  /*                                                                       */
  /*     glyph_loader :: The glyph loader for all faces managed by this    */
  /*                     driver.  This object isn't defined for unscalable */
  /*                     formats.                                          */
  /*                                                                       */
  typedef struct  FT_DriverRec_
  {
    FT_ModuleRec      root;
    FT_Driver_Class*  clazz;

    FT_ListRec        faces_list;
    void*             extensions;

    FT_GlyphLoader*   glyph_loader;

  } FT_DriverRec;


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /****                                                                 ****/
  /****                                                                 ****/
  /****                       L I B R A R I E S                         ****/
  /****                                                                 ****/
  /****                                                                 ****/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


#define FT_DEBUG_HOOK_TRUETYPE   0
#define FT_DEBUG_HOOK_TYPE1      1


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    FT_LibraryRec                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The FreeType library class.  This is the root of all FreeType      */
  /*    data.  Use FT_New_Library() to create a library object, and        */
  /*    FT_Done_Library() to discard it and all child objects.             */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    memory           :: The library's memory object.  Manages memory   */
  /*                        allocation.                                    */
  /*                                                                       */
  /*    generic          :: Client data variable.  Used to extend the      */
  /*                        Library class by higher levels and clients.    */
  /*                                                                       */
  /*    num_modules      :: The number of modules currently registered     */
  /*                        within this library.  This is set to 0 for new */
  /*                        libraries.  New modules are added through the  */
  /*                        FT_Add_Module() API function.                  */
  /*                                                                       */
  /*    modules          :: A table used to store handles to the currently */
  /*                        registered modules. Note that each font driver */
  /*                        contains a list of its opened faces.           */
  /*                                                                       */
  /*    renderers        :: The list of renderers currently registered     */
  /*                        within the library.                            */
  /*                                                                       */
  /*    cur_renderer     :: The current outline renderer.  This is a       */
  /*                        shortcut used to avoid parsing the list on     */
  /*                        each call to FT_Outline_Render().  It is a     */
  /*                        handle to the current renderer for the         */
  /*                        ft_glyph_format_outline format.                */
  /*                                                                       */
  /*    auto_hinter      :: XXX                                            */
  /*                                                                       */
  /*    raster_pool      :: The raster object's render pool.  This can     */
  /*                        ideally be changed dynamically at run-time.    */
  /*                                                                       */
  /*    raster_pool_size :: The size of the render pool in bytes.          */
  /*                                                                       */
  /*    debug_hooks      :: XXX                                            */
  /*                                                                       */
  typedef struct  FT_LibraryRec_
  {
    FT_Memory          memory;           /* library's memory manager */

    FT_Generic         generic;

    FT_Int             version_major;
    FT_Int             version_minor;
    FT_Int             version_patch;

    FT_UInt            num_modules;
    FT_Module          modules[FT_MAX_MODULES];  /* module objects  */

    FT_ListRec         renderers;        /* list of renderers        */
    FT_Renderer        cur_renderer;     /* current outline renderer */
    FT_Module          auto_hinter;

    FT_Byte*           raster_pool;      /* scan-line conversion */
                                          /* render pool          */
    FT_ULong           raster_pool_size; /* size of render pool in bytes */

    FT_DebugHook_Func  debug_hooks[4];

  } FT_LibraryRec;


  FT_BASE( FT_Renderer )
  FT_Lookup_Renderer( FT_Library       library,
                      FT_Glyph_Format  format,
                      FT_ListNode*     node );

  FT_BASE( FT_Error )
  FT_Render_Glyph_Internal( FT_Library    library,
                            FT_GlyphSlot  slot,
                            FT_UInt       render_mode );

  typedef const char*
  (*FT_PSName_Requester)( FT_Face  face );

  typedef FT_Error
  (*FT_Glyph_Name_Requester)( FT_Face     face,
                              FT_UInt     glyph_index,
                              FT_Pointer  buffer,
                              FT_UInt     buffer_max );

  typedef FT_UInt
  (*FT_Name_Index_Requester)( FT_Face     face,
                              FT_String*  glyph_name );


#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM

  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_New_Stream                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Creates a new stream object.                                       */
  /*                                                                       */
  /* <Input>                                                               */
  /*    filepathname :: The name of the stream (usually a file) to be      */
  /*                    opened.                                            */
  /*                                                                       */
  /*    stream       :: A pointer to the stream object.                    */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_EXPORT( FT_Error )
  FT_New_Stream( const char*  filepathname,
                 FT_Stream    astream );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Done_Stream                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Closes and destroys a stream object.                               */
  /*                                                                       */
  /* <Input>                                                               */
  /*    stream :: The stream to be closed and destroyed.                   */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Done_Stream( FT_Stream  stream );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_New_Memory                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Creates a new memory object.                                       */
  /*                                                                       */
  /* <Return>                                                              */
  /*    A pointer to the new memory object.  0 in case of error.           */
  /*                                                                       */
  FT_EXPORT( FT_Memory )
  FT_New_Memory( void );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Done_Memory                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Discards memory manager.                                           */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory :: A handle to the memory manager.                          */
  /*                                                                       */
  FT_EXPORT( void )
  FT_Done_Memory( FT_Memory  memory );

#endif /* !FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */


  /* Define default raster's interface.  The default raster is located in  */
  /* `src/base/ftraster.c'.                                                */
  /*                                                                       */
  /* Client applications can register new rasters through the              */
  /* FT_Set_Raster() API.                                                  */

#ifndef FT_NO_DEFAULT_RASTER
  FT_EXPORT_VAR( FT_Raster_Funcs )  ft_default_raster;
#endif


FT_END_HEADER

#endif /* __FTOBJS_H__ */


/* END */