>> Playing with ftmulti I noticed that almost all variable fonts
>> exhibit jumpy 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 smoothly.
>
> The best way to see this behaviour is
>
> % ftgrid.exe -f6 ~/Fonts/Adobe/SourceSans3VF-Roman.ttf
I couldn't find this font. Link, please! However, the font
`SourceSans3-VariableFont_wght.ttf` (as downloaded from Google Fonts)
doesn't contain any hints – or rather, it contains a pseudo-prep table
with a few instructions while `maxSizeOfInstructions` in the `maxp`
table is incorrectly set to zero...
> When you start increasing the weight [F4] the advance line wiggles.
It would be interesting to see the behaviour with a font that contains
real bytecode instructions...
Werner
