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sorting ligatures
Posted by cuttin shapes in
23 Sep 2007 — 2:55am
23 Sep 2007 — 2:55am
I'm probably answering my own question but:
if i have ligatures for 'a_m' and 'c_a' and i write the word 'came' how it does it work exactly.
if my coding goes
sub am by a_m;
sub ca by c_a;
then i'm assuming it would use the a_m ligature.
I'm creating a ligature rich font and was wondering if people know of any problems with having a lot ligatures.
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23 Sep 2007 — 4:27am
You answered your question. :) Indeed you need to plan carefully which ligatures shall have priority.
Don't forget the space between 'a' and 'm', or 'c' and 'a' -- 'am' would be considered as one glyph named 'am'.
24 Sep 2007 — 12:58am
One very common mistake is to mix up the priority of overlapping ligatures, e.g.
sub f f i by f_f_i;sub f f by f_f;
sub f i by f_i;
If that ffi ligature is not first, it will get preceded by the others and never appear.
Also, beware of the output of other alternate features (e.g. 'salt') affecting the input of ligatures. You might want an alternate f to be included in your ligature substitution -- or you might not. If you have contextual substitutions ('calt', 'clig'), then you'll have to worry about other alternates and ligatures affecting the context in those features, too.