shithub: freetype+ttf2subf

ref: 3469d0d038b01c7ddce0fb67da68d79ad2f8b8a6
dir: /src/autohint/ahangles.h/

View raw version
/***************************************************************************/
/*                                                                         */
/*  ahangles.h                                                             */
/*                                                                         */
/*    a routine used to compute vector angles with limited accuracy        */
/*    and very high speed.                                                 */
/*                                                                         */
/*  Copyright 2000: Catharon Productions Inc.                              */
/*  Author: David Turner                                                   */
/*                                                                         */
/*  This file is part of the Catharon Typography Project and shall only    */
/*  be used, modified, and distributed under the terms of the Catharon     */
/*  Open Source License that should come with this file under the name     */
/*  "CatharonLicense.txt". By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/*  Note that this license is compatible with the FreeType license         */
/*                                                                         */
/***************************************************************************/
#ifndef AGANGLES_H
#define AGANGLES_H

#ifdef FT_FLAT_COMPILE
#include "ahtypes.h"
#else
#include <autohint/ahtypes.h>
#endif

#include <freetype/internal/ftobjs.h>

/* PI expressed in ah_angles - we don't really need an important */
/* precision, so 256 should be enough..                          */
#define AH_PI         256
#define AH_2PI        (AH_PI*2)
#define AH_HALF_PI    (AH_PI/2)
#define AH_2PIMASK    (AH_2PI-1)

/* the number of bits to use to express an arc tangent */
/* see the structure of the lookup table..             */
#define AH_ATAN_BITS  8

LOCAL_DEF  const AH_Angle    ah_arctan[ 1L << AH_ATAN_BITS ];

LOCAL_DEF  AH_Angle    ah_angle( FT_Vector* v );

#endif /* AGANGLES_H */