I believe there is a bug in the SHZ instruction. I believe SHZ should not move the phantom points in the zone.
The attached font contains one interesting glyph "~" and lots of glyphs which are vertical bars and are included to show spacing. The interesting glyph moves the zone by 4 pixels. In freetype this increases the advance width of the glyph. On the mac (with it's native rasterizer) the advance width is not increased. The example images were taken with a 9ppem rasterization. ftstring -m "A~A" 9 Untitled1.ttf The attached patch fixes the problem I see...
Untitled1.ttf
Description: application/font-ttf
Untitled1-mac.png
Description: PNG image
Untitled1-freetype.png
Description: PNG image
--- ttinterp.c~ 2007-01-19 16:44:07.000000000 -0800
+++ ttinterp.c 2007-01-19 17:14:22.000000000 -0800
@@ -5466,8 +5466,14 @@
if ( COMPUTE_Point_Displacement( &dx, &dy, &zp, &refp ) )
return;
- if ( CUR.zp2.n_points > 0 )
+ /* XXX: UNDOCUMENTED! SHZ doesn't move the phantom points */
+ /* Twilight zone has no contours, so use n_points. */
+ /* Normal zone n_points includes phantoms, so must use end*/
+ /* of last contour */
+ if ( CUR.GS.gep2 == 0 && CUR.zp2.n_points > 0 )
last_point = (FT_UShort)(CUR.zp2.n_points - 1);
+ else if ( CUR.GS.gep2 == 1 && CUR.zp2.n_contours > 0 )
+ last_point = (FT_UShort)(CUR.zp2.contours[ CUR.zp2.n_contours-1 ]);
else
last_point = 0;
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