I need to do some low level hacking on Charis SIL for some linguistics texts that I’m writing. Charis SIL has all the weird diacritics, phonetic symbols, and other characters that I need for the basic text, but it lacks functional small caps, there are a bunch of kerning problems, and there are a few glyph shapes that I want to adjust (the super- and subscript numbers were obviously just scaled down and are thus too light, for example). I’ve never done serious font design, so the only thing I know how to do is add glyphs and tinker with outlines. But now I’m faced with doing some OpenType stuff that I have no understanding of. Are there any good references on how to go about adding small caps, alternate forms, and other OpenType things to a font? Better references than just reading the standard and trying to figure it out on my own?
I’m probably going to use FontForge for the job, since I’m already somewhat familiar with it. I could use FontLab, but I don’t know my way around it at all.
Any suggestions on where to start?