--- a/misc/libfreetype/src/tools/test_trig.c Tue Jul 16 11:14:27 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,236 +0,0 @@
-#include <ft2build.h>
-#include FT_FREETYPE_H
-#include FT_TRIGONOMETRY_H
-
-#include <math.h>
-#include <stdio.h>
-
-#define PI 3.14159265358979323846
-#define SPI (PI/FT_ANGLE_PI)
-
-/* the precision in 16.16 fixed float points of the checks. Expect */
-/* between 2 and 5 noise LSB bits during operations, due to */
-/* rounding errors.. */
-#define THRESHOLD 64
-
- static error = 0;
-
- static void
- test_cos( void )
- {
- FT_Fixed f1, f2;
- double d1, d2;
- int i;
-
- for ( i = 0; i < FT_ANGLE_2PI; i += 0x10000 )
- {
- f1 = FT_Cos(i);
- d1 = f1/65536.0;
- d2 = cos( i*SPI );
- f2 = (FT_Fixed)(d2*65536.0);
-
- if ( abs( f2-f1 ) > THRESHOLD )
- {
- error = 1;
- printf( "FT_Cos[%3d] = %.7f cos[%3d] = %.7f\n",
- (i >> 16), f1/65536.0, (i >> 16), d2 );
- }
- }
- }
-
-
-
- static void
- test_sin( void )
- {
- FT_Fixed f1, f2;
- double d1, d2;
- int i;
-
- for ( i = 0; i < FT_ANGLE_2PI; i += 0x10000 )
- {
- f1 = FT_Sin(i);
- d1 = f1/65536.0;
- d2 = sin( i*SPI );
- f2 = (FT_Fixed)(d2*65536.0);
-
- if ( abs( f2-f1 ) > THRESHOLD )
- {
- error = 1;
- printf( "FT_Sin[%3d] = %.7f sin[%3d] = %.7f\n",
- (i >> 16), f1/65536.0, (i >> 16), d2 );
- }
- }
- }
-
-
- static void
- test_tan( void )
- {
- FT_Fixed f1, f2;
- double d1, d2;
- int i;
-
- for ( i = 0; i < FT_ANGLE_PI2-0x2000000; i += 0x10000 )
- {
- f1 = FT_Tan(i);
- d1 = f1/65536.0;
- d2 = tan( i*SPI );
- f2 = (FT_Fixed)(d2*65536.0);
-
- if ( abs( f2-f1 ) > THRESHOLD )
- {
- error = 1;
- printf( "FT_Tan[%3d] = %.7f tan[%3d] = %.7f\n",
- (i >> 16), f1/65536.0, (i >> 16), d2 );
- }
- }
- }
-
-
- static void
- test_atan2( void )
- {
- FT_Fixed c2, s2;
- double l, a, c1, s1;
- int i, j;
-
- for ( i = 0; i < FT_ANGLE_2PI; i += 0x10000 )
- {
- l = 5.0;
- a = i*SPI;
-
- c1 = l * cos(a);
- s1 = l * sin(a);
-
- c2 = (FT_Fixed)(c1*65536.0);
- s2 = (FT_Fixed)(s1*65536.0);
-
- j = FT_Atan2( c2, s2 );
- if ( j < 0 )
- j += FT_ANGLE_2PI;
-
- if ( abs( i - j ) > 1 )
- {
- printf( "FT_Atan2( %.7f, %.7f ) = %.5f, atan = %.5f\n",
- c2/65536.0, s2/65536.0, j/65536.0, i/65536.0 );
- }
- }
- }
-
- static void
- test_unit( void )
- {
- FT_Vector v;
- double a, c1, s1;
- FT_Fixed c2, s2;
- int i;
-
- for ( i = 0; i < FT_ANGLE_2PI; i += 0x10000 )
- {
- FT_Vector_Unit( &v, i );
- a = ( i*SPI );
- c1 = cos(a);
- s1 = sin(a);
- c2 = (FT_Fixed)(c1*65536.0);
- s2 = (FT_Fixed)(s1*65536.0);
-
- if ( abs( v.x-c2 ) > THRESHOLD ||
- abs( v.y-s2 ) > THRESHOLD )
- {
- error = 1;
- printf( "FT_Vector_Unit[%3d] = ( %.7f, %.7f ) vec = ( %.7f, %.7f )\n",
- (i >> 16),
- v.x/65536.0, v.y/65536.0,
- c1, s1 );
- }
- }
- }
-
-
- static void
- test_length( void )
- {
- FT_Vector v;
- FT_Fixed l, l2;
- int i;
-
- for ( i = 0; i < FT_ANGLE_2PI; i += 0x10000 )
- {
- l = (FT_Fixed)(500.0*65536.0);
- v.x = (FT_Fixed)( l * cos( i*SPI ) );
- v.y = (FT_Fixed)( l * sin( i*SPI ) );
- l2 = FT_Vector_Length( &v );
-
- if ( abs( l2-l ) > THRESHOLD )
- {
- error = 1;
- printf( "FT_Length( %.7f, %.7f ) = %.5f, length = %.5f\n",
- v.x/65536.0, v.y/65536.0, l2/65536.0, l/65536.0 );
- }
- }
- }
-
-
- static void
- test_rotate( void )
- {
- FT_Fixed c2, s2, c4, s4;
- FT_Vector v;
- double l, ra, a, c1, s1, cra, sra, c3, s3;
- int i, j, rotate;
-
- for ( rotate = 0; rotate < FT_ANGLE_2PI; rotate += 0x10000 )
- {
- ra = rotate*SPI;
- cra = cos( ra );
- sra = sin( ra );
-
- for ( i = 0; i < FT_ANGLE_2PI; i += 0x10000 )
- {
- l = 500.0;
- a = i*SPI;
-
- c1 = l * cos(a);
- s1 = l * sin(a);
-
- v.x = c2 = (FT_Fixed)(c1*65536.0);
- v.y = s2 = (FT_Fixed)(s1*65536.0);
-
- FT_Vector_Rotate( &v, rotate );
-
- c3 = c1 * cra - s1 * sra;
- s3 = c1 * sra + s1 * cra;
-
- c4 = (FT_Fixed)(c3*65536.0);
- s4 = (FT_Fixed)(s3*65536.0);
-
- if ( abs( c4 - v.x ) > THRESHOLD ||
- abs( s4 - v.y ) > THRESHOLD )
- {
- error = 1;
- printf( "FT_Rotate( (%.7f,%.7f), %.5f ) = ( %.7f, %.7f ), rot = ( %.7f, %.7f )\n",
- c1, s1, ra,
- c2/65536.0, s2/65536.0,
- c4/65536.0, s4/65536.0 );
- }
- }
- }
- }
-
-
- int main( void )
- {
- test_cos();
- test_sin();
- test_tan();
- test_atan2();
- test_unit();
- test_length();
- test_rotate();
-
- if (!error)
- printf( "trigonometry test ok !\n" );
-
- return !error;
- }