Re: OpenType Features

[Simon Albrecht]

On 31.01.2016 07:14, Jay Anderson wrote:
> An update for those interested. I got something working.

Brilliant! Looking forward to have this in LilyPond :-)

>   The attached
> patch is certainly not ready to be merged, but I'm curious if the
> chosen interface seems reasonable (see smallcaps.ly which is
> attached). It adds a new 'font-features' property to the
> font-interface (at least that's what I think I'm doing
> http://www.lilypond.org/doc/v2.18/Documentation/internals/font_002dinterface).

It definitely looks like a good way to go, except that I wouldn’t know 
how to use multiple features at the same time. Would it be possible to 
input font-features as a symbol list, i.e. (random example)
{ \override TextScript.font-features = onum.smcp 4-"foo" }
ossia
\markup { \override #'(font-features . (onum smcp)) "foo" } ?
Or at least as a list of strings.

Even better would be a possibility to accumulate features, like in

%%%%%%%%%%%%%%%%
\version "2.19.36"

\useFontFeatures #'(ss01 onum)

\score {
  \new Staff \with { instrumentName = \markup { \use-font-features 
#'(dlig) Th09 } }
  { 1-\markup { \concat { C \use-font-features #'(subs) 1 } or C1 } }
}
%%%%%%%%%%%%%%%%

I don’t quite know how to implement that in a way which offers full 
flexibility, though.

Best regards, Simon