Trouble with contextual positioning that works on VOLT

yairc22

I have created a font for signwriting:
https://github.com/yairc2223/swfontdev/blob/066fcff36b5d9c5765ba0839d318d445be9c3e6c/yairsw2.ttf
it works well on volt but doesn't work on the following HTML:
https://github.com/yairc2223/swfontdev/blob/066fcff36b5d9c5765ba0839d318d445be9c3e6c/index1.html

Sami Artur Mandelbaum

Hi @yairc22,
In Your VOLT project, there is only 1 character in each group.
Is it right?
Regards
Sami

Simon Cozens

Your font seems to work in Harfbuzz, although I can't completely tell because I'm not sure what output you expect. In the "boxes should disappear" example, I see SW A S20310 SW M turns into .null S20310 .null, which I guess is the boxes disappearing? What is the contextual positioning rule that isn't working for you - what input are you giving and what output do you expect? (Incidentally I've never seen a font with spaces in the glyph names before; that shouldn't be a problem, but it's certainly unusual.)

Can I recommend using the Crowbar debugger for troubleshooting OpenType layout problems?

John Hudson

See also @Kamal Mansour advice:

https://twitter.com/_KamalMansour/status/1501739037853315078?s=20&t=gPGu2qrnxNNhMoxowzz7qA