src/freetype/autohint/ahangles.h

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ahangles.h                                                             */
   4 /*                                                                         */
   5 /*    A routine used to compute vector angles with limited accuracy        */
   6 /*    and very high speed (specification).                                 */
   7 /*                                                                         */
   8 /*  Copyright 2000 Catharon Productions Inc.                               */
   9 /*  Author: David Turner                                                   */
  10 /*                                                                         */
  11 /*  This file is part of the Catharon Typography Project and shall only    */
  12 /*  be used, modified, and distributed under the terms of the Catharon     */
  13 /*  Open Source License that should come with this file under the name     */
  14 /*  `CatharonLicense.txt'.  By continuing to use, modify, or distribute    */
  15 /*  this file you indicate that you have read the license and              */
  16 /*  understand and accept it fully.                                        */
  17 /*                                                                         */
  18 /*  Note that this license is compatible with the FreeType license.        */
  19 /*                                                                         */
  20 /***************************************************************************/
  21
  22
  23 #ifndef AHANGLES_H
  24 #define AHANGLES_H
  25
  26
  27 #ifdef FT_FLAT_COMPILE
  28
  29 #include "ahtypes.h"
  30
  31 #else
  32
  33 #include <autohint/ahtypes.h>
  34
  35 #endif
  36
  37
  38 #include <freetype/internal/ftobjs.h>
  39
  40
  41   /* PI expressed in ah_angles -- we don't really need an important */
  42   /* precision, so 256 should be enough                             */
  43 #define AH_PI       256
  44 #define AH_2PI      ( AH_PI * 2 )
  45 #define AH_HALF_PI  ( AH_PI / 2 )
  46 #define AH_2PIMASK  ( AH_2PI - 1 )
  47
  48   /* the number of bits used to express an arc tangent; */
  49   /* see the structure of the lookup table              */
  50 #define AH_ATAN_BITS  8
  51
  52   extern
  53   const AH_Angle  ah_arctan[1L << AH_ATAN_BITS];
  54
  55
  56   LOCAL_DEF
  57   AH_Angle  ah_angle( FT_Vector*  v );
  58
  59
  60 #endif /* AHANGLES_H */
  61
  62
  63 /* END */