On Wed, Aug 11, 2010 at 09:39:07PM +0100, Michael Lynch wrote: > On 11/08/2010 20:54, Michael Lynch wrote: > >Hello all, > > > >I'm trying to test for the existence of an OpenType font feature before > >it's used in a document. > > > >I want a command that will transparently emulate an acceptable > >alternative in the event that the feature doesn't exist, whilst logging > >the problem in the log file. Since the command is part of a package I'm > >creating, I think this is preferable to it failing outright. > > > >One of the features I'd like to test for is small caps. I'm not > >optimistic, as in a plain XeTeX document, > > > >\font\a="Times New Roman:+smcp" at 12pt > > > >doesn't register as causing any problems, even though this call doesn't > >produce anything different to > > > >\font\a="Times New Roman" at 12pt > > > >Have I missed something? opentype-info.tex iterates through all the > >features, so there might be some way to check each one as it goes past, > >but this does seem pretty laborious. I don't really have the experience > >of TeX to know how to do something with that either though. > > > >Thanks, > > > >Mike > > > > One thing I'd forgotten is that with XeLaTeX, fontspec warns when > features aren't available. Looking at the package, it seems that > \fontspec_check_ot_feat is responsible, but this package is about as > complicated as any I've looked at and I'm not quite sure how it > should be used. > > Will, or someone else suitably knowledgeable, can you explain how > this could be used for this?
Fontspec 2 has public API for checking font features, check fontspec manual ยง18 Programing details. Regards, Khaled -- Khaled Hosny Arabic localiser and member of Arabeyes.org team Free font developer -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
