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Viewing changes to src/3rdparty/freetype/src/autohint/ahangles.h

  • Committer: Bazaar Package Importer
  • Author(s): Adam Conrad
  • Date: 2005-08-24 04:09:09 UTC
  • Revision ID: james.westby@ubuntu.com-20050824040909-xmxe9jfr4a0w5671
Tags: upstream-4.0.0
Import upstream version 4.0.0

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src/3rdparty/freetype/src/autohint/ahangles.h
 
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/***************************************************************************/
 
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/*                                                                         */
 
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/*  ahangles.h                                                             */
 
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/*                                                                         */
 
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/*    A routine used to compute vector angles with limited accuracy        */
 
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/*    and very high speed (specification).                                 */
 
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/*                                                                         */
 
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/*  Copyright 2000-2001, 2002 Catharon Productions Inc.                    */
 
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/*  Author: David Turner                                                   */
 
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/*                                                                         */
 
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/*  This file is part of the Catharon Typography Project and shall only    */
 
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/*  be used, modified, and distributed under the terms of the Catharon     */
 
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/*  Open Source License that should come with this file under the name     */
 
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/*  `CatharonLicense.txt'.  By continuing to use, modify, or distribute    */
 
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/*  this file you indicate that you have read the license and              */
 
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/*  understand and accept it fully.                                        */
 
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/*                                                                         */
 
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/*  Note that this license is compatible with the FreeType license.        */
 
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/*                                                                         */
 
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/***************************************************************************/
 
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#ifndef __AHANGLES_H__
 
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#define __AHANGLES_H__
 
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#include <ft2build.h>
 
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#include FT_INTERNAL_OBJECTS_H
 
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#include "ahtypes.h"
 
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FT_BEGIN_HEADER
 
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  /* PI expressed in ah_angles -- we don't really need an important */
 
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  /* precision, so 256 should be enough                             */
 
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#define AH_PI       256
 
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#define AH_2PI      ( AH_PI * 2 )
 
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#define AH_HALF_PI  ( AH_PI / 2 )
 
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#define AH_2PIMASK  ( AH_2PI - 1 )
 
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  /* the number of bits used to express an arc tangent; */
 
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  /* see the structure of the lookup table              */
 
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#define AH_ATAN_BITS  8
 
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  extern
 
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  const AH_Angle  ah_arctan[1L << AH_ATAN_BITS];
 
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  FT_LOCAL( AH_Angle )
 
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  ah_angle( FT_Vector*  v );
 
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  FT_LOCAL( AH_Angle )
 
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  ah_angle_diff( AH_Angle  angle1,
 
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                 AH_Angle  angle2 );
 
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FT_END_HEADER
 
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#endif /* __AHANGLES_H__ */
 
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/* END */