[lltx] microtype and OpenType "opbd" feature

Pablo Rodríguez oinos at web.de
Tue Mar 7 07:20:31 CET 2017


I’m not a LuaLaTeXt user myself (I use ConTeXt), but a friend asked me
how to enable the OpenType feature "opbd" (which is actually
"lfbd"+"rtbd") in LuaLaTeX.

ConTeXt has enabled recently optical bounds for the new font loader:

  \setupbodyfont[ebgaramond, 150pt]
       \input tufte

It requires protrusion to be enabled too.

I asked Will Robertson to implement the "opbd" feature in fontspec
(https://github.com/wspr/fontspec/issues/282), but since protrusion is
involved, it may require also implementation in microtype.

Would it be possible to implement optical bounds in LuaLaTeX?

Many thanks for your help,


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