[fontforge-users] Contextual substitutions

[marcelo magalhaes]

Hello,

I'm working in a typeface called Coiny (Latin and Tamil )

https://github.com/marcelommp/Coiny

and after have a good experience with basic subs at this moment I'm having
some troubles with contextual substitutions.

I've been testing some tutorials and reading a lot of materials but I'm
stuck at this point.

Here a image of what I need:

Loading Image...

On the left side in grey backgroun an exemple of the string I need working
in Catamaran Typeface and on the right side the same string with Coiny
typeface in blue background.

I tried a lot with the lookups even creating mark classes:

Loading Image...

I Know how to resolve this creating a new glyph and doing a basic
substitution but I think this isn't smart and probably increase the size
file.

Thanks,

Marcelo