[Qt-interest] Using Opentype features with QFont

[Henry de Valence]

Is it possible to specify the opentype features I want to use with a QFont?
For example, suppose I want to paint text using the +onum option for old-style 
numerals. I read the QFont docs but I didn't see how to do that.

Alternatively, if this isn't possible to do with Qt, could someone recommend a 
library that I could use fairly easily from a program written with Qt?

Henry de Valence