diff options
Diffstat (limited to 'nx-X11/extras/freetype2/src/autohint/ahangles.c')
| -rw-r--r-- | nx-X11/extras/freetype2/src/autohint/ahangles.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/nx-X11/extras/freetype2/src/autohint/ahangles.c b/nx-X11/extras/freetype2/src/autohint/ahangles.c new file mode 100644 index 000000000..ef5a88ee6 --- /dev/null +++ b/nx-X11/extras/freetype2/src/autohint/ahangles.c @@ -0,0 +1,147 @@ +/***************************************************************************/ +/* */ +/* ahangles.h */ +/* */ +/* A routine used to compute vector angles with limited accuracy */ +/* and very high speed (body). */ +/* */ +/* 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. */ +/* */ +/***************************************************************************/ + + +#include <ft2build.h> +#include "ahangles.h" + + + /* the following table has been automatically generated with */ + /* the `mather.py' Python script */ + + const AH_Angle ah_arctan[1L << AH_ATAN_BITS] = + { + 0, 0, 1, 1, 1, 2, 2, 2, + 3, 3, 3, 3, 4, 4, 4, 5, + 5, 5, 6, 6, 6, 7, 7, 7, + 8, 8, 8, 9, 9, 9, 10, 10, + 10, 10, 11, 11, 11, 12, 12, 12, + 13, 13, 13, 14, 14, 14, 14, 15, + 15, 15, 16, 16, 16, 17, 17, 17, + 18, 18, 18, 18, 19, 19, 19, 20, + 20, 20, 21, 21, 21, 21, 22, 22, + 22, 23, 23, 23, 24, 24, 24, 24, + 25, 25, 25, 26, 26, 26, 26, 27, + 27, 27, 28, 28, 28, 28, 29, 29, + 29, 30, 30, 30, 30, 31, 31, 31, + 31, 32, 32, 32, 33, 33, 33, 33, + 34, 34, 34, 34, 35, 35, 35, 35, + 36, 36, 36, 36, 37, 37, 37, 38, + 38, 38, 38, 39, 39, 39, 39, 40, + 40, 40, 40, 41, 41, 41, 41, 42, + 42, 42, 42, 42, 43, 43, 43, 43, + 44, 44, 44, 44, 45, 45, 45, 45, + 46, 46, 46, 46, 46, 47, 47, 47, + 47, 48, 48, 48, 48, 48, 49, 49, + 49, 49, 50, 50, 50, 50, 50, 51, + 51, 51, 51, 51, 52, 52, 52, 52, + 52, 53, 53, 53, 53, 53, 54, 54, + 54, 54, 54, 55, 55, 55, 55, 55, + 56, 56, 56, 56, 56, 57, 57, 57, + 57, 57, 57, 58, 58, 58, 58, 58, + 59, 59, 59, 59, 59, 59, 60, 60, + 60, 60, 60, 61, 61, 61, 61, 61, + 61, 62, 62, 62, 62, 62, 62, 63, + 63, 63, 63, 63, 63, 64, 64, 64 + }; + + + FT_LOCAL_DEF( AH_Angle ) + ah_angle( FT_Vector* v ) + { + FT_Pos dx, dy; + AH_Angle angle; + + + dx = v->x; + dy = v->y; + + /* check trivial cases */ + if ( dy == 0 ) + { + angle = 0; + if ( dx < 0 ) + angle = AH_PI; + return angle; + } + else if ( dx == 0 ) + { + angle = AH_HALF_PI; + if ( dy < 0 ) + angle = -AH_HALF_PI; + return angle; + } + + angle = 0; + if ( dx < 0 ) + { + dx = -v->x; + dy = -v->y; + angle = AH_PI; + } + + if ( dy < 0 ) + { + FT_Pos tmp; + + + tmp = dx; + dx = -dy; + dy = tmp; + angle -= AH_HALF_PI; + } + + if ( dx == 0 && dy == 0 ) + return 0; + + if ( dx == dy ) + angle += AH_PI / 4; + else if ( dx > dy ) + angle += ah_arctan[FT_DivFix( dy, dx ) >> ( 16 - AH_ATAN_BITS )]; + else + angle += AH_HALF_PI - + ah_arctan[FT_DivFix( dx, dy ) >> ( 16 - AH_ATAN_BITS )]; + + if ( angle > AH_PI ) + angle -= AH_2PI; + + return angle; + } + + + FT_LOCAL_DEF( AH_Angle ) + ah_angle_diff( AH_Angle angle1, + AH_Angle angle2 ) + { + AH_Angle delta; + + + delta = ( angle2 - angle1 ); + if ( delta < 0 ) + delta += AH_2PI; + + if ( delta > AH_PI ) + delta -= AH_2PI; + + return delta; + } + +/* END */ |