ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /libfreetype/ahangles.h/
/***************************************************************************/
/* */
/* ahangles.h */
/* */
/* A routine used to compute vector angles with limited accuracy */
/* and very high speed (specification). */
/* */
/* Copyright 2000-2001, 2002 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 __AHANGLES_H__
#define __AHANGLES_H__
#include <ft2build.h>
#include FT_INTERNAL_OBJECTS_H
#include "ahtypes.h"
FT_BEGIN_HEADER
/* 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 used to express an arc tangent; */
/* see the structure of the lookup table */
#define AH_ATAN_BITS 8
extern
const AH_Angle ah_arctan[1L << AH_ATAN_BITS];
FT_LOCAL( AH_Angle )
ah_angle( FT_Vector* v );
FT_LOCAL( AH_Angle )
ah_angle_diff( AH_Angle angle1,
AH_Angle angle2 );
FT_END_HEADER
#endif /* __AHANGLES_H__ */
/* END */