[MPEG-OTSPEC] Does OpenType have a one to many GSUB-like feature please?

[Erwin Denissen]

Hi William,

 > Does OpenType have a one to many GSUB-like feature please?

There is a substitution lookup type that replaces one glyph with a 
collection of glyphs. See:

https://learn.microsoft.com/en-us/typography/opentype/spec/gsub#lookuptype-2-multiple-substitution-subtable

 > I am wondering if a font could have a table where the
 > codepoint (or postscript name) of an emoji is substituted
 > by the codepoints of a sequence of regular text
 > characters, with the output then routed to a
 > text to speech system.

There is no such system AFAIK, but you can always make up your own font 
table for your own use.

Best regards,

Erwin Denissen

High-Logic
http://www.high-logic.com/


On 23-Dec-22 3:47 PM, William_J_G Overington wrote:
> Hi
> 
> 
> Does OpenType have a one to many GSUB-like feature please?
> 
> 
> The reason I ask is because I have seen, as a result of a feature in 
> Emoji Wrap - Issue 58, which arrived today, notes about a study about 
> accessibility to emoji in messages in relation to a recipient who has 
> vision issues.
> 
> 
> https://rit.az1.qualtrics.com/jfe/form/SV_5uuo92seRMFzV66
> 
> 
> I am wondering if there is an OpenType feature that is like the reverse 
> of using a liga table to substitute a ligature glyph from two or more 
> characters in the original text.
> 
> 
> I am wondering if a font could have a table where the codepoint (or 
> postscript name) of an emoji is substituted by the codepoints of a 
> sequence of regular text characters, with the output then routed to a 
> text to speech system.
> 
> 
> Best regards,
> 
> 
> William Overington
> 
> 
> Friday 23 December 2022
> 
> 
> 
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