Re: Jumpy variations

Alexei Podtelezhnikov <[email protected]> Tue, 26 Aug 2025 08:32:20 -0400
Newsgroups gmane.comp.fonts.freetype.devel
Message-ID <CAJU=AjWcckEKyNJUg-Y8P9DeKDQhM=vX3OwfJXaNWZoSOtMJ8A@mail.gmail.com>
On Mon, Aug 25, 2025 at 11:56=E2=80=AFAM Alexei Podtelezhnikov
<[email protected]> wrote:

> Playing with ftmulti I noticed that almost all variable fonts exhibit jum=
py heights and advances when varying individual axes, instead of monotonous=
 changes. I could associate this weird behavior with the bytecode hinting. =
Without it or with autohining, the heights and advances are changing smooth=
ly.

The best way to see this behaviour is
% ftgrid.exe -f6 ~/Fonts/Adobe/SourceSans3VF-Roman.ttf

When you start increasing the weight [F4] the advance line wiggles.

Alexei