| /***************************************************************************/ |
| /* */ |
| /* ahangles.h */ |
| /* */ |
| /* A routine used to compute vector angles with limited accuracy */ |
| /* and very high speed (specification). */ |
| /* */ |
| /* Copyright 2000-2001 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_END_HEADER |
| |
| #endif /* __AHANGLES_H__ */ |
| |
| |
| /* END */ |
