How do you measure? When I get time to build Sile, I'm first going to remove FreeType dep... <div class="gmail_quote">On Aug 9, 2015 4:58 PM, "Simon Cozens" <<a href="mailto:simon@simon-cozens.org">simon@simon-cozens.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 09/08/2015 09:15, Simon Cozens wrote: > OK, I'm now trying to set the scaling to the font upem, but I'm not > getting that working either. After a bit of fiddling I have now got it working, using: hb_face_t* hbFace = hb_ft_face_create_cached(face); hb_ft_font = hb_font_create (hbFace); unsigned int upem = hb_face_get_upem(hbFace); hb_font_set_scale(hb_ft_font, upem, upem); hb_ft_font_set_funcs(hb_ft_font); It's about 50% slower than using Freetype functions directly, which is a big shame(!), but computers always get faster and I'm sure this way gives me more flexibility later... See latest version: <a href="https://github.com/simoncozens/sile/blob/master/src/justenoughharfbuzz.c#L263" rel="noreferrer" target="_blank">https://github.com/simoncozens/sile/blob/master/src/justenoughharfbuzz.c#L263</a> </blockquote></div>