arabic.h   [plain text]

/****************************************************************************/
/*                                                                          */
/*  The FreeType project -- a free and portable quality TrueType renderer.  */
/*                                                                          */
/*  Copyright 1996-1999 by                                                  */
/*  D. Turner, R.Wilhelm, and W. Lemberg                                    */
/*                                                                          */
/*  arabic -- An implementation of the contextual algorithm given in the    */
/*  Unicode 2.0 book to assign the `isolated', `initial', `medial', and     */
/*  `final' properties to an input string of character codes for the Arabic */
/*  script.                                                                 */
/*                                                                          */
/****************************************************************************/


#include "freetype.h"
#include "ftxopen.h"


  enum  joining_type_
  {
    isolated = 1,       /* nominal        */
    final    = 2,       /* right_joining  */
    initial  = 4,       /* left_joining   */
    medial   = 8        /* double_joining */
  };

  typedef enum joining_type_  joining_type;


  /* A glyph's property value as needed by e.g. TT_GSUB_Apply_String()
     specifies which features should *not* be applied                  */

  enum  arabic_glyph_property_
  {
    isolated_p = final    | initial | medial,
    final_p    = isolated | initial | medial,
    initial_p  = isolated | final   | medial,
    medial_p   = isolated | final   | initial
  };

  typedef enum arabic_glyph_property_  arabic_glyph_property;


  enum  joining_class_
  {
    right,
    left,               /* not used */
    dual,
    causing,
    none,
    transparent
  };

  typedef enum joining_class_  joining_class;


  TT_Error  Assign_Arabic_Properties( TT_UShort*  string,
                                      TT_UShort*  properties,
                                      TT_UShort   length );
  TT_Error  Build_Arabic_Glyph_Properties( TT_CharMap        char_map,
                                           TT_UShort         max_glyphs,
                                           TTO_GDEFHeader**  gdef );


/* End */