Problems with class kerning

Dario Muhafara's picture

Dear List.

I am trying to kern throw class kerning and i get this line:

"Start of new pair positioning subtable; some pairs may never be accessed: [f ff] [dotlessi i iacute icircumflex idieresis igrave]"

for sure i had made some kind of mistake, can anybody help me with this?
i am thinking about wrong positioning in the classes panel, am i right?

thanks in advance.

k.l.'s picture

Hello! Maybe the first thing to check is whether any glyph appears in more than one leftside class or more than one rightside class.

Tim Ahrens's picture

There is a button with a yin-yang sign in the Kerning Assistance dialogue that helps you detect such kind of mistakes in the class definitions.

Dario Muhafara's picture

hi Tim, hi Karsten!

I checked both things already and seems to be fine. there is no duplicate within the class kern. I have this [f ff] in both kern and metric classes, but should work fine anyway I believe...

Miss Tiffany's picture

Dario, did your problem get resolved?

Dario Muhafara's picture

yes, with i copy his solution to keep it here for anybody else:

You need to do two things --
Go to the OpenType Panel (which contains the feature code)
and delete all the class definitions from the bottom-right
Go to FontLab Options/Preferences (depends on whether you
use Windows or Mac),
click through the submenus "General Options" and "Unicode
and OpenType" -- and therein activate both options:
"Add all glyph classes [...]"
"Do not add metrics classes"

Now go to the OpenType Panel again and compile. Over
here this worked well without error message.

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