Tibetan fonts

[Tom]

Hi,

I did typeset few books in Heirloom Troff with quite good outcome.
For next book I need to use Tibetan font and unfortunately I can't make 
work in Heirloom Troff and Groff, only Neatroff does work.

Right now I'm eager to completely switch to Groff. I can make any font 
work in Groff but not Tibetan. To my basic knowledge, I guess it is all 
about blwm and blws not accessible. There are only few Tibetan fonts 
with complex glyph composition which works in Neatroff. In groff I have 
managed only BabelStoneTibetan to display but several glyphs doesn't 
compose.

For viewing I have attached Groff and Neatroff pdfs.

YagpoTibetanUni: 100% composing in Neatroff but 100% failed in Groff and 
Heirloom troff.
BabelStoneTibetan: 100% failed in Groff and Neatroff.

I have tried various tibetan fonts, as well NotoSerifTibetan present in 
linux repositories. All those fonts don't work and groff yields:
troff:<standard input>:20: warning: special character 'u0F04' not defined
troff:<standard input>:20: warning: special character 'u0F05' not defined
troff:<standard input>:20: warning: special character 'u0F0D' not defined
...

If I understand enough, the warnings are about missing glyph mappings.

Would you mind to have a look and check if Tibetan fonts are possible to 
make work in Groff ? I appreciate for any hints, and direction I can 
follow to make it happen.


Regards,
Tom

OK_YagpoTibetanUni_neatroff.pdf
Description: Adobe PDF document

BabelStoneTibetan_groff.pdf
Description: Adobe PDF document

BabelStoneTibetan_neatroff.pdf
Description: Adobe PDF document