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Diffstat (limited to 'src/autofit/afangles.c')
| -rw-r--r-- | src/autofit/afangles.c | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/src/autofit/afangles.c b/src/autofit/afangles.c deleted file mode 100644 index e2360d1..0000000 --- a/src/autofit/afangles.c +++ /dev/null @@ -1,292 +0,0 @@ -/***************************************************************************/ -/* */ -/* afangles.c */ -/* */ -/* Routines used to compute vector angles with limited accuracy */ -/* and very high speed. It also contains sorting routines (body). */ -/* */ -/* Copyright 2003, 2004, 2005, 2006 by */ -/* David Turner, Robert Wilhelm, and Werner Lemberg. */ -/* */ -/* This file is part of the FreeType project, and may only be used, */ -/* modified, and distributed under the terms of the FreeType project */ -/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ -/* this file you indicate that you have read the license and */ -/* understand and accept it fully. */ -/* */ -/***************************************************************************/ - - -#include "aftypes.h" - - -#if 0 - - FT_LOCAL_DEF( FT_Int ) - af_corner_is_flat( FT_Pos x_in, - FT_Pos y_in, - FT_Pos x_out, - FT_Pos y_out ) - { - FT_Pos ax = x_in; - FT_Pos ay = y_in; - - FT_Pos d_in, d_out, d_corner; - - - if ( ax < 0 ) - ax = -ax; - if ( ay < 0 ) - ay = -ay; - d_in = ax + ay; - - ax = x_out; - if ( ax < 0 ) - ax = -ax; - ay = y_out; - if ( ay < 0 ) - ay = -ay; - d_out = ax + ay; - - ax = x_out + x_in; - if ( ax < 0 ) - ax = -ax; - ay = y_out + y_in; - if ( ay < 0 ) - ay = -ay; - d_corner = ax + ay; - - return ( d_in + d_out - d_corner ) < ( d_corner >> 4 ); - } - - - FT_LOCAL_DEF( FT_Int ) - af_corner_orientation( FT_Pos x_in, - FT_Pos y_in, - FT_Pos x_out, - FT_Pos y_out ) - { - FT_Pos delta; - - - delta = x_in * y_out - y_in * x_out; - - if ( delta == 0 ) - return 0; - else - return 1 - 2 * ( delta < 0 ); - } - -#endif - - - /* - * We are not using `af_angle_atan' anymore, but we keep the source - * code below just in case... - */ - - -#if 0 - - - /* - * The trick here is to realize that we don't need a very accurate angle - * approximation. We are going to use the result of `af_angle_atan' to - * only compare the sign of angle differences, or check whether its - * magnitude is very small. - * - * The approximation - * - * dy * PI / (|dx|+|dy|) - * - * should be enough, and much faster to compute. - */ - FT_LOCAL_DEF( AF_Angle ) - af_angle_atan( FT_Fixed dx, - FT_Fixed dy ) - { - AF_Angle angle; - FT_Fixed ax = dx; - FT_Fixed ay = dy; - - - if ( ax < 0 ) - ax = -ax; - if ( ay < 0 ) - ay = -ay; - - ax += ay; - - if ( ax == 0 ) - angle = 0; - else - { - angle = ( AF_ANGLE_PI2 * dy ) / ( ax + ay ); - if ( dx < 0 ) - { - if ( angle >= 0 ) - angle = AF_ANGLE_PI - angle; - else - angle = -AF_ANGLE_PI - angle; - } - } - - return angle; - } - - -#elif 0 - - - /* the following table has been automatically generated with */ - /* the `mather.py' Python script */ - -#define AF_ATAN_BITS 8 - - static const FT_Byte af_arctan[1L << AF_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( AF_Angle ) - af_angle_atan( FT_Fixed dx, - FT_Fixed dy ) - { - AF_Angle angle; - - - /* check trivial cases */ - if ( dy == 0 ) - { - angle = 0; - if ( dx < 0 ) - angle = AF_ANGLE_PI; - return angle; - } - else if ( dx == 0 ) - { - angle = AF_ANGLE_PI2; - if ( dy < 0 ) - angle = -AF_ANGLE_PI2; - return angle; - } - - angle = 0; - if ( dx < 0 ) - { - dx = -dx; - dy = -dy; - angle = AF_ANGLE_PI; - } - - if ( dy < 0 ) - { - FT_Pos tmp; - - - tmp = dx; - dx = -dy; - dy = tmp; - angle -= AF_ANGLE_PI2; - } - - if ( dx == 0 && dy == 0 ) - return 0; - - if ( dx == dy ) - angle += AF_ANGLE_PI4; - else if ( dx > dy ) - angle += af_arctan[FT_DivFix( dy, dx ) >> ( 16 - AF_ATAN_BITS )]; - else - angle += AF_ANGLE_PI2 - - af_arctan[FT_DivFix( dx, dy ) >> ( 16 - AF_ATAN_BITS )]; - - if ( angle > AF_ANGLE_PI ) - angle -= AF_ANGLE_2PI; - - return angle; - } - - -#endif /* 0 */ - - - FT_LOCAL_DEF( void ) - af_sort_pos( FT_UInt count, - FT_Pos* table ) - { - FT_UInt i, j; - FT_Pos swap; - - - for ( i = 1; i < count; i++ ) - { - for ( j = i; j > 0; j-- ) - { - if ( table[j] > table[j - 1] ) - break; - - swap = table[j]; - table[j] = table[j - 1]; - table[j - 1] = swap; - } - } - } - - - FT_LOCAL_DEF( void ) - af_sort_widths( FT_UInt count, - AF_Width table ) - { - FT_UInt i, j; - AF_WidthRec swap; - - - for ( i = 1; i < count; i++ ) - { - for ( j = i; j > 0; j-- ) - { - if ( table[j].org > table[j - 1].org ) - break; - - swap = table[j]; - table[j] = table[j - 1]; - table[j - 1] = swap; - } - } - } - - -/* END */ |