[MPEG-OTSPEC] Hints, TT and CFF (was: Re: Proposal to make OFF complete)

[Behdad Esfahbod]

On Wed, Sep 16, 2020 at 5:32 PM Dave Crossland <dcrossland at google.com>
wrote:

> On Wed, Sep 16, 2020, 4:08 PM Behdad Esfahbod <behdad at behdad.org> wrote:
>
>> On Thu, Aug 27, 2020 at 7:50 AM Dave Crossland <dcrossland at google.com>
>> wrote:
>>
>>> Haha, awesome!
>>>
>>> I must admit my ignorance with regards to CFF2, but, isn't one of the
>>> major features of CFF2 that hints can vary?
>>>
>>
>> Major in what way? Yes, CFF2 hints can vary. Also yes, TT-based varfonts'
>> hints can also vary.
>>
>
> Major in that Ken's fonts don't take advantage of it, and yet a "business
> case" for CFF and CFF2 that I've heard is that rendering is superior
> because of the hinting model..
>
> Ignoring the major problem though: that CFF/CFF2 hinting interpretation is
>> FULLY UNSPECIFIED. So varying or not is moot.
>>
>
> I'm eager to hear your thoughts on the thread where this was discussed, as
> Terence I believe proposed that TTF hinting is also unspecified.
>

I'm not going to reply to Terence's email because it qualifies for
"whataboutism". That is, TTF hinting might be underspecified. But that
doesn't detract from my point, that CFF/CFF2 hinting is FULLY unspecified.
That sounds more like Eric's reply though. Terence's goes into CVT details
that I find wrong / irrelevant.
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