Hi, Jonathan, I asked my font vendor and they explained that when specific kerning pair accompanies a kerning class, it work as "class exception" rather than a correction to the kerning for classes. There are several words about it in Opentype specification. (Unfortunately, I didn't find anything about cumulative behaviour of several specific pairs.)
Do you know how exactly XeTeX deal with it? Vadim >> I finally found the explanation. Mea culpa, it was in the kerning in >> the font. All 3 lookup tables contained kerning -50 for small caps >> Cyrillic `t' and `a', and the was another one of -60 in kerning >> classes, which gave the total of -210. >> >> I'm not sure if it is allowed and what should be the default behavior >> of typesetting program -- to add them of to use the last. > > Are all those lookup tables assigned to the 'kern' feature within the same > script and language system? If so, then they're cumulative. If the lookups > are each assigned to a different script/language, then they shouldn't all be > applied at the same time. > > JK > > >> If it is >> stated somewhere and you can point me to it, i will complain to my >> font vendor. And of course I will check for such cases myself and wipe >> out extra kerning. > > > > > -------------------------------------------------- > Subscriptions, Archive, and List information, etc.: > http://tug.org/mailman/listinfo/xetex > -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
