[XeTeX] Incorrect rendering of Vedic Sanskrit accents

[David M. Jones]

> Date: Fri, 22 May 2015 17:18:34 +0200
> From: Zdenek Wagner <zdenek.wagner at gmail.com>
> 
> Hi David,
> 
> as far as I understand rendering Devanagari fonts, this is handled by
> the GPOS tables. I would therefore suspect a bug in the font that
> should be reported to the font desogner.

The fact that luaTeX renders the examples correctly would seem to rule
that out.  But no, switching fonts doesn't change the basic behaviour.

David.

> I do not know Snaskrit, I am
> not able to judge whether the positions of Vedic accents are correct
> or not. Could you try the same sample with other Devanagari fonts and
> see what happends?
> Zdeněk Wagner
> http://hroch486.icpf.cas.cz/wagner/
> http://icebearsoft.euweb.cz
> 
> 
> 2015-05-22 16:14 GMT+02:00 David M. Jones <dmj at dmj.ams.org>:
> > I posted this to the XeTeX sourceforge tracker a couple of weeks ago,
> > and it was suggested that I also mention it here.  The sourceforge
> > ticket is
> >
> >     https://sourceforge.net/p/xetex/bugs/111/
> >
> > and the zip file is
> >
> >     https://sourceforge.net/p/xetex/bugs/111/attachment/xetex-indic-bug.zip
> >
> > Cheers,
> > David.
> >
> > P.S. There's actually a third class of bug that is clearly visible in
> > the table at the top of my document, but which I didn't mention
> > explicitly: XeTeX won't typeset one of the Devanagari combining
> > characters in isolation without adding a prothetic dotted circle
> > (U+25CC).
> >
> > ===========================================================================
> >
> > On a lark, I've been experimenting with typesetting Vedic Sanskrit,
> > specifically verses from the Ṛg-Veda, using the Murty Hindi font from
> > Tiro Typeworks.  So far, XeTeX works beautifully, with two exceptions
> > involving the Vedic udatta and anudatta accent marks:
> >
> > a) They don't attach properly to the Devanagari digits 1 and 3, and
> >
> > b) They don't combine properly with the candrabindu, anusvara, and
> >    visarga signs.
> >
> > luaTeX does render these correctly, so it doesn't appear to be a
> > problem with the font itself.
> >
> > I've included a zip file with a test file and sample output from
> > luaTeX and XeTeX.
> >
> > Is this a bug, or am I missing something obvious?
> >
> >
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