[MPEG-OTSPEC] Separate `VARC` table proposal

[Behdad Esfahbod]

Hello again,

Over the past few days I experimented with and implemented many more
optimization ideas in the `VARC` table, to make it even more compact. I
updated the proposal briefly:

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

I would welcome any feedback, but otherwise am happy with the results.

Feel free to discuss here, or on:

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

Happy holidays,

behdad
http://behdad.org/


On Sun, Dec 17, 2023 at 7:06 PM Behdad Esfahbod <behdad at behdad.org> wrote:

> 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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