Hi! I'm trying to understand how the OpenType layout works for GSUB rules in a right-to-left direction scripts, and I have questions that I can't find the answer to.
In the case of precomposed Hebrew letters with combined marks (such as alefdagesh-hb uniFB30
- Does it make a sense to add a composition for them in ccmp?
- If so, should I wrap these rules in a lookup with the script hebr and language IWR labels? The documentation says that ccmp is not script/languages sensitive, so looks like it doesn't make a sense.
- Is it necessary to specify the right-to-left (RTL) direction for such a lookup?
sub alef-hb dagesh-hb by alefdagesh-hb;
Thanks in advance.