* src/base/fttrigon.c (FT_Vector_Rotate): Avoid rounding errors

ChangeLog

@@ -1,3 +1,13 @@
+2003-05-15  David Turner  <david@freetype.org>
+
+	* src/base/fttrigon.c (FT_Vector_Rotate): Avoid rounding errors
+	for small values.
+
+2003-05-15  Werner Lemberg  <wl@gnu.org>
+
+	* src/autohint/ahtypes.h (AH_PointRec): Remove unused `in_angle'
+	and `out_angle' fields.
+
 2003-05-14  George Williams  <gww@silcom.com>
 
 	* src/base/ftmac.c (FT_New_Face_From_SFNT): Handle CFF files also.

src/autohint/ahtypes.h

@@ -201,10 +201,6 @@ FT_BEGIN_HEADER
   /*                                                                       */
   /*    out_dir   :: The direction of the outwards vector (point->next).   */
   /*                                                                       */
-  /*    in_angle  :: The angle of the inwards vector.                      */
-  /*                                                                       */
-  /*    out_angle :: The angle of the outwards vector.                     */
-  /*                                                                       */
   /*    next      :: The next point in same contour.                       */
   /*                                                                       */
   /*    prev      :: The previous point in same contour.                   */
@@ -220,9 +216,6 @@ FT_BEGIN_HEADER
     AH_Direction  in_dir;   /* direction of inwards vector  */
     AH_Direction  out_dir;  /* direction of outwards vector */
 
-    AH_Angle      in_angle;
-    AH_Angle      out_angle;
-
     AH_Point      next;     /* next point in contour     */
     AH_Point      prev;     /* previous point in contour */
 

src/base/fttrigon.c

@@ -356,6 +356,14 @@
   }
 
 
+  /* 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 )
@@ -366,8 +374,8 @@
     FT_Vector  v;
 
 
-    v.x = vec->x;
-    v.y = vec->y;
+    v.x   = vec->x;
+    v.y   = vec->y;
 
     if ( angle && ( v.x != 0 || v.y != 0 ) )
     {
@@ -376,10 +384,13 @@
       v.x = ft_trig_downscale( v.x );
       v.y = ft_trig_downscale( v.y );
 
-      if ( shift >= 0 )
+      if ( shift > 0 )
       {
-        vec->x = v.x >> shift;
-        vec->y = v.y >> shift;
+        FT_Int32  half = 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;
       }
       else
       {