Question about ligatures!

Scripting
1

hello for all

I work on an Arabic font
I make all ligatures as required ligatures and I want this option as the standard for the font

but I want to give the user the option if he don’t want to use the ligatures to back to the normal style for the letters

how can I make this ??

thanks in advance

2

The answer is yes, and the following is an explanation.

There are three types of ligatures depending on whether you want them active by default and be user-controlled, and there are OpenType names for them:
rlig: Required ligature. Appears by default and the user cannot disable (like lam_alef).
liga: Standard ligature. Appears by default and the user can disable.
dlig: Discretionary ligature. Doesn’t appear by default and the user can enable.

If you have a ligature glyph like feh_yeh-ar, its default behaviour is dlig, meaning if you go to Font Info > Features and update features (button at the bottom left), the ligature is treated as a dlig one. It doesn’t appear by default as explained.

If you want to make them a standard ligature, you add the suffix ‘.liga’ to the glyph name (feh_yeh-ar.liga) and update the features. And if you want to make it a required ligature, similarly add ‘.rlig’.

Some ligatures like lam_alef are always considered rlig, which is why their glyph names are not like ‘lam_alef.rlig’ but still get picked up in rlig feature.

4 Likes
3

Thanks for your time
And for this explaination

I will try this

Really thanks