[XeTeX] Zapfino

Adam Twardoch list.adam at twardoch.com
Thu Jul 12 00:19:01 CEST 2007

Bruno, thanks for the corrected links.

Since I developed the OpenType Layout features for the font in question 
(Zapfino Extra Pro), it's a matter that seems very interesting to me.

The contextual logic in Zapfino Extra Pro performs backtrack and 
lookahead lookups that go as far as 6 glyphs across, including the space 
character. Unfortunately, different OpenType Layout engines treat the 
space character differently -- some Layout engines execute OpenType 
lookups on an entire line of text while some only execute OpenType 
lookups word-by-word. I may be mistaken but I am under the impression 
that XeTeX currently executes OpenType lookups word-by-word, i.e. as if 
each word were a separate line of text. This means that lookups such as 
the ones I develop that reach across to surrounding words do not work at 

Please make a simple test: type the word "Mutter" three times after each 
other, i.e.:

Mutter Mutter Mutter

In InDesign, you should get three different renderings of that word. 
What's the result in XeTeX?

Adam Twardoch


Adam Twardoch
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