Hi Ulrike,
On Sun, 2025-04-13 at 12:15 +0200, Ulrike Fischer wrote:
> And I didn't find yet examples or a documentation how to define a
> callback that "decorates" the tfm.
I think that this would be the "define_font" callback. You should be
able to take the example from ยง6.3.3 and replace "v.commands = <...>"
with "v.tounicode = { <unicode_codepoint> }" (the documentation says
that this needs to be a UTF-16 string, but a table of integer codepoints
works too).
Luaotfload already hooks into the "define_font" callback, so you should
only need to override "fonts.readers.tfm". Actually, there's already a
function "fonts.mappings.addtounicode", so you could either replace that
with your own function, or add a manipulator that runs before/after
that.
Thanks,
-- Max
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