[MPEG-OTSPEC] VARC, glyf, and TT-instructions

[Skef Iterum]

On 1/24/24 23:47, Laurence Penney wrote:
>> On 25 Jan 2024, at 01:25, Skef Iterum via mpeg-otspec 
>> <mpeg-otspec at lists.aau.at> wrote:
>
>     There is a distinction between whether the text path itself is
>     skewed or
>     rotated and whether a component in a composite is skewed or rotated.
>     Asking around it seems as though with the existing glyf components
>     instructions are /not/ automatically turned off when
>     "compositing", but
>     perhaps that info is wrong.
>
>     Either way, though, that seems like something the specification should
>     clarify.
>
> I asked similar questions when I was getting my head around TT 
> hinting, and recall being told that skewed or rotated components were 
> not hinted. The person I asked would most likely have been Greg Hitchcock.
>
Josh Hadley on our team got curious about this and did an experiment or two
in VTT. As far as we can tell there is no automatic disabling of hints 
when using
"not nice" transformations, at least in that tool. We can provide a specific
example or two if anyone needs them.

It's possible that the "client side" implementations work differently 
than the
development tools but designers are likely to take the guidance of those 
tools
unless there is very strong conventional wisdom pointing in a different
direction.

Skef
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