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

git/fs: mount .git/fs: mount/attach disallowed

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,5 +1,10 @@

 2018-06-28  Alexei Podtelezhnikov  <[email protected]>

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

+	(FT_Vector_Rotate): Simplify.

+

+2018-06-28  Alexei Podtelezhnikov  <[email protected]>

+

 	* src/base/ftobjs.c (FT_Set_Charmap): Robustify.

 2018-06-25  Werner Lemberg  <[email protected]>

--- a/src/base/fttrigon.c

+++ b/src/base/fttrigon.c

@@ -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

     {