Glyph not reposition correctly, GPOS not apply about fontkit HOT 5 CLOSED

Which specific font (name + version + font maker) is this for?

from fontkit.

This is national standard font of Thailand. I use it many times with pdfkit < 0.8 without problem.

"TH Sarabun New"
You can try this font

THSarabunNew.zip

Sample test
for GPOS
ดีปี ด่ ป่ ดู ฤู

for GSUB
ดู ญ ญู ฐ ฐู

from fontkit.

Old PDFKit did not use fontkit, and thus did not apply GPOS. New PDFKit uses fontkit, but we don't have a thai shaper yet, so it is using the default shaper, which may be misbehaving here.

from fontkit.

Turns out this font is actually an AAT font (i.e. it has a morx table). However, we were still applying fallback positioning using unicode properties. As of d357519, I have turned this off for AAT fonts. Now it will only be applied if there is both no AAT and no GPOS support.

Published in v1.6.1.

from fontkit.

It's working now. Thank you very much for your effort.

from fontkit.