On 12/05/2019 05:15, Eli Zaretskii wrote:
OK, thanks.  I think this is a large chunk of the solution to my
problem...

Also, does HarfBuzz support TrueType Collection (TTC) files, and if
so, does it want the data only for the currently selected font or all
of the data?

Assuming you're still stuck, have a look at the "shape" function in
https://github.com/simoncozens/sile/blob/master/src/justenoughharfbuzz.c

The parameters (lua-wrapped) are: text to shape, as a string; the binary contents of the font file; the index of the font in a TTC; the script code, direction as a string, language code, point size, and any list of features.

Simon
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