[MPEG-OTSPEC] "anim" feature tag

[Skef Iterum]

 1. Feature variations aren't the only source of non-continuous changes,
    there's also the various things one can do with "location-adjacent"
    masters, such as sudden kerning changes. And while most people
    associate master tricks with kerning and feature variations with
    glyph substitution, either mechanism can be used in either context,
    depending on what you're trying to do.
 2. It's not safe to assume that the font's default location will have
    all of the right choices. The default weight might have a dollar
    sign with two slashes and there might just be no way to make that
    work at all other locations. The choices made for "anim" will
    sometimes be based on a compromise for what can work "everywhere".

Skef

On 1/31/24 01:51, Simon Cozens via mpeg-otspec wrote:
> On 31/01/2024 09:45, Skef Iterum via mpeg-otspec wrote:
>> This is a simple enough idea, but I lack the context to come up with 
>> specifically what the section needs to say -- what advice to give to 
>> designers. Someone closer to the design side of things would do a 
>> better job. If anyone comes up with that wording but doesn't want to 
>> worry about ISO header pages and such, send it to me and I'll wrap it 
>> up into a proposal.
>
> I started to think about what the wording should be: the advice would 
> be that you should replace any glyphs which have such "breaks" by 
> glyphs with glyphs which don't - i.e. replace glyphs which have 
> Feature Variations by those which don't.
>
> Then I realised that instead of having a feature tag, the animation 
> software could just not bother to process Feature Variations, or at 
> least have an option to turn Feature Variation processing off.
>
> S
>
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