If I have a Tex font, and I want to really understand how it will be laid out by Tex, and what features of the font to bear in mind when tuning my output to be beautiful, what tools are useful for this?
- I've heard that the usual measure of font size, points per em, is tricky. Is there a good overview of how these measurements are used in font design? One that relates this information to Metafont and True/Open Type fonts?
- I'd like to see where baselines and the em square are on the glyphs of a font. Are there tools to do that?
- Where can I get summary information about fonts? How do I understand the content of .tfm files? Are there tools that generate these summaries?
- Is there relevant information in fontspec?
I've asked this question as a generalisation of How to determine the true size of a font, because the narrow discussion there didn't really settle all the issues.