Hi, (Forwarding this on on behalf of a fontspec user who would like a new feature. Not currently subscribed so please CC me directly if you have further comment.)
TL;DR: +lfbd feature works in XeTeX but +rtbd does not. If there are further requests for fontspec OpenType feature support, please let me know via Github :) All the best, Will > Begin forwarded message: > > From: Pablo Rodríguez <notificati...@github.com> > Subject: Re: [wspr/fontspec] add optical bounds to fontspec (#282) > Date: 17 March 2017 at 5:18:33 am ACDT > > Will, sorry because I was so stupid not to recognize what I already knew. > > The following works in LuaTeX and (partially) in XeTeX from TL 2016: > > \input ifluatex.sty > \ifluatex\input luaotfload.sty\fi > \font\1="TestOPBD-Regular:+lfbd,+rtbd" > \1 Ἠ > > Ἠ\hfill Ἠ > > Ἦ\hfill ὩὩ > > ἯἯ\hfill ὩὩ > \bye > Output from ConTeXt (sorry, but I don’t know how to get a reasonable page > size in plain TeX): > > > <https://cloud.githubusercontent.com/assets/203767/24013230/047699c2-0a81-11e7-87fa-ede28bcd08f4.png> > What I knew: opbd is handled by the application, not by the font (which > provides both lfbd and rtbd, but no opbd). > > To test both sides of optical margin, I added rtbd values to the font > provided for testing at http://www.ousia.tk/TestOPBD-Regular.otf > <http://www.ousia.tk/TestOPBD-Regular.otf>. > > The partial failure in XeTeX is that rtbd doesn’t seem to work. > > I’m not subscribed to the XeTeX mailing list. If you were, would you be so > kind to report this issue there? > > I guess an option name such as OpticalBounds or OpticalMargins might make > sense here. >
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