[MPEG-OTSPEC] Separate `VARC` table proposal

[Behdad Esfahbod]

Hi everyone,

Here's my current status on a separate `VARC` table.

After experimenting with using the ItemVariationStore in `VARC`, I managed
to design a data-structure, called MultiItemVariationStore that is much
more efficient.

The fonts generated this way are (sometimes much) more compact than my
previous approach of encoding variable composites in glyf/gvar. So it's a
win-win situation.

Here's the main discussion thread:

  https://github.com/harfbuzz/boring-expansion-spec/issues/103

Here's the current, very terse, draft spec:

  https://github.com/harfbuzz/boring-expansion-spec/blob/main/varc.md

And here's a FontTools patchset:

  https://github.com/fonttools/fonttools/pull/3395


Regards,

behdad
http://behdad.org/
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