Punch through features

1

I want to add a feature (rlig) to a font.

  1. Approach 1: Is it possible to manipulate the features table on an existing font? I’m fine with a CLI based solution.
    It’s not a good option to import the font into Glyphs, as it loses information, but this approach won’t work anyway as I don’t have rights to distribute a modified version of the font.

  2. Approach 2: Is it possible to have a font that is ONLY feature information (no glyphs)? When I try to Export such a font, I get this error:

Error: "Glyph "F" not in font (featMapGName2GID)" in Feature rlig in line: 1

The idea is to use MyFont, which contains the feature information I want, but no glyphs, as OS X is smart enough to pull glyphs from the default System Font when they aren’t available in the current font. Make sense?

2
  1. yes. Look into ttx/fonttools or otmaster.
  2. No. Features cannot work across fonts. They always reference glyph IDs in the same font.
3

Thanks! Assuming you have experience with fonttools, are you willing to consult outside the forums for $$$?