Question: FG and hb-shape give different results

[Patrick Gundlach]

This is related to a proprietary font and a vague question, I hope it is still okay to open it here.

The font MinionPro-Regular.otf shows for the word fish and no features turned on or off the following output:

f_i	532	0	0	0	234	
s	363	0	0	2	84	
h	534	0	0	3	73	

which is what I expect. (Same result when I activate the liga feature).

Now with harfbuzz (hb-shape) I get the following:

$ hb-shape MinionPro-Regular.otf fish
[f=0+306|i=1+265|s=2+363|h=3+534]

also with +liga:

hb-shape --features="+liga"  MinionPro-Regular.otf fish    
[f=0+306|i=1+265|s=2+363|h=3+534]

hb-shape --version                                     
hb-shape (HarfBuzz) 7.1.0
Available shapers: graphite2,ot,coretext,fallback

Question: is fontgoggles using special parameters when invoking the shaper? How can I reproduce the result from fontgoggles?

(FG Version 1.7.4 (1.7.4))

[Just van Rossum]

I'm getting [f_i=0+532|s=2+363|h=3+534] from hb-shape, although my version isn't quite up to date. FontGoggles uses uharfbuzz, but isn't doing anything special, really.

[Patrick Gundlach]

Thank you very much. I close this as it is now my job to find out why hb-shape is doing what it does.