On 01/03/2017 13:37, Joseph Wright wrote:
My guess is for the rare 'override' case one would probably do something
at the macro level in any case (kerning is all wrong to start with).
Kerning is all wrong if you use TFM-based typesetting and then just
reverse the character nodes; but in principle it should be fine if you
use OpenType and actually override the character directionality:
\nopagenumbers
\parindent=0pt
\TeXXeTstate=1
Using \fontname\font\ in TFM typesetting mode:
LVTATVL
\beginR LVTATVL\endR
\bigskip
\font\tenrmOT="[lmroman10-regular.otf]/OT" at 10pt
\tenrmOT
\def\rtl#1{\beginR ^^^^202e#1^^^^202c\endR}
Using \fontname\font\ in OpenType mode:
LVTATVL
\rtl{LVTATVL}
\bye
JK
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