[luatex] Please document units_per_em
luigi.scarso at gmail.com
Tue Dec 8 13:51:33 CET 2020
On Tue, Dec 8, 2020 at 1:39 PM Patrick Gundlach <patrick at gundla.ch> wrote:
> Hello all,
> I could not find the key units_per_em in the font table (6.1 The font
> tables), I assume this is just an oversight. Perhaps this could be
> Thank you
I think so. Iirc, It should be related to the unusual em-size:
* There is a new <tfmtable> key: 'units_per_em' (defaults to 0).
This is part of a fix for bug #200 (Problem with CFF fonts having
em-size other than 1000): there is a special correction to the
embedded cff font itself and the font scale if the font to be output
is opentype or type1 in unicode encoding and the 'units_per_em
differs' from zero.
<tfmtable>.units_per_em has to be passed back to luatex from
the lua font loading code for this to work.
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