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* src/base/fttrigon.c (FT_Tan): Improve accuracy. 

(FT_Vector_Rotate): Simplify.
This commit is contained in:
Alexei Podtelezhnikov 2018-06-28 21:42:26 -04:00
parent 4f11209f5c
commit 1fc776b5f1
2 changed files with 9 additions and 12 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-06-28 Alexei Podtelezhnikov <apodtele@gmail.com>
* src/base/fttrigon.c (FT_Tan): Improve accuracy.
(FT_Vector_Rotate): Simplify.
2018-06-28 Alexei Podtelezhnikov <apodtele@gmail.com>
* src/base/ftobjs.c (FT_Set_Charmap): Robustify.

16
src/base/fttrigon.c
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@ -325,10 +325,10 @@
FT_EXPORT_DEF( FT_Fixed )
FT_Tan( FT_Angle angle )
{
FT_Vector v;
FT_Vector v = { 1 << 24, 0 };
FT_Vector_Unit( &v, angle );
ft_trig_pseudo_rotate( &v, angle );
return FT_DivFix( v.y, v.x );
}
@ -372,14 +372,6 @@
}
/* these macros return 0 for positive numbers,
and -1 for negative ones */
#define FT_SIGN_LONG( x ) ( (x) >> ( FT_SIZEOF_LONG * 8 - 1 ) )
#define FT_SIGN_INT( x ) ( (x) >> ( FT_SIZEOF_INT * 8 - 1 ) )
#define FT_SIGN_INT32( x ) ( (x) >> 31 )
#define FT_SIGN_INT16( x ) ( (x) >> 15 )
/* documentation is in fttrigon.h */
FT_EXPORT_DEF( void )
@ -408,8 +400,8 @@
FT_Int32 half = (FT_Int32)1L << ( shift - 1 );
vec->x = ( v.x + half + FT_SIGN_LONG( v.x ) ) >> shift;
vec->y = ( v.y + half + FT_SIGN_LONG( v.y ) ) >> shift;
vec->x = ( v.x + half - ( v.x < 0 ) ) >> shift;
vec->y = ( v.y + half - ( v.y < 0 ) ) >> shift;
}
else
{