64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/***************************************************************************/
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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 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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#ifdef FT_FLAT_COMPILE
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#include "ahtypes.h"
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#else
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#include <autohint/ahtypes.h>
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#endif
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#include <freetype/internal/ftobjs.h>
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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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LOCAL_DEF
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AH_Angle ah_angle( FT_Vector* v );
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#endif /* AHANGLES_H */
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/* END */
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