[MPEG-OTSPEC] Does a rendering system know if a variation selector requested glyph is not available in a font?

[John Hudson]

On 2024-06-21 3:41 pm, William_J_G Overington wrote:
> It did occur to me that, in my opinion, it would be better to encode 
> 256 User-Defined Variation Selectors.

Unless you are anticipating 256 variations of a single character needing 
to be captured in plain text, that would be significant overkill. 
Indeed, even if the arguments of the proposal document are accepted, I 
doubt if 128 codepoints would be assigned to implementing it. I suspect 
64 would be plenty and 48 would /probably/ suffice.

Remember: a) you only need enough variation selectors to address the 
number of variants, not the number of characters of which there are 
variants; and b) these would be the equivalent of PUA variation 
selectors, so with no guaranteed interoperability beyond private 
agreement among font makers and within user communities. So the 
variation selectors would be shared among characters and also across 
fonts for different fields and communities of scholars.

JH


-- 

John Hudson
Tiro Typeworks Ltdwww.tiro.com

Tiro Typeworks is physically located on islands
in the Salish Sea, on the traditional territory
of the Snuneymuxw and Penelakut First Nations.

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