[ft-devel] Bug in SHZ instruction?

[George Williams]

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

shz.patch
Description: Text document