Support for reading and writing Ligatures in a Font

[mattlag]

I'm not sure what the best way to do this would be, from the Font object perspective. Extend the Glyph object? Create a peer to Font.glyphs that is Font.ligatures?

• create a new Ligature
• ask the Font object to return a Glyph object for a ligature

Anyway, just putting this on the radar.

[davelab6]

This is the other side of the #95 coin, about adding support for GSUB rather than GPOS :)

I think ideally opentype.js will port https://github.com/typesupply/feaTools to js

(In the near term you could just support the ligatures that are directly Unicode encoded)

[mattlag]

Ah, I didn't think about ligatures with their own single Unicode value. That is a great idea.

[davelab6]

http://en.wikipedia.org/wiki/List_of_precomposed_Latin_characters_in_Unicode Versus https://github.com/twardoch/ttfdiet :)

[Jolg42]

Note : The GSUB table is now readable / writeable 🎊

[mattlag]

Thank you, @Jolg42!