[MPEG-OTSPEC] [EXTERNAL] Shared GSUB/GPOS notes, was Re: dmap proposal

[Skef Iterum]

On 1/13/24 22:15, Liam R. E. Quin via mpeg-otspec wrote:
> Would it make more sense, instead of a DMAP table, to have a TTC header
> field that lists tables that should be treated as delta tables - i.e.
> look in this GSUB first and then this other one?
I'm not sure whether "DSUB" is a viable idea, but I am pretty sure that
it would need to be used pretty specifically, such that it would probably
make more sense to give it its own name, even if it just uses a subset of
the GSUB infrastructure.
> At any rate i'm working on a revised DMAP proposal, as per the last "ad
> hoc" call, and plan to make it public this coming week after i finish
> working on the other proposal... so then we'll have something concrete
> to discuss.
>
> Right now it's the same as the rather brief DMAP section in the main
> Google Fonts proposal, except it'll have more text and a pretty picture
> to try & give more context. But thats only because its what i have, not
> an expression of an opinion.
It looks like the draft proposal from 2016 that was mentioned at the last
Ad Hoc meeting is appended to Peter's email to this list from December
22nd: https://lists.aau.at/pipermail/mpeg-otspec/2023-December/003177.html
That includes some table format restrictions and some guidance for UVS.

Skef