David Carlisle d.p.carlisle at
Tue Oct 15 12:06:43 CEST 2019

On Tue, 15 Oct 2019 at 10:41, Zdenek Wagner <zdenek.wagner at> wrote:
> Hi,
> I do not know much about OTP, I read an article about it many years
> ago but never tried. I know the difference between XeTeX and luatex.
> XeTeX first used ICU, now it makes use of harfbuzz, hence generally
> all scripts are supported and should work. It is still a chance that
> an error will be spotted by maintainers of these libraries even
> outside TeX so we can benefit from users of other systems. In luatex
> the glyph rendering must be programmed in lua.

No, Ulrike's example was with luahbtex which is luatex+harfbuzz (and
likely to be the engine used for lualatex going forward)

> It can be done but
> somebody has to do it. However, these rendering algorithms are used in
> luatex only. Moreover, Devanagari is in luatex broken again and I am
> not able to find a version which worked. And I do ot have time to
> prepare a bug report. It can also be a font specific problem, because
> the same feature can be encoded by several ways. I found that some
> Devanageri fonts work fine in XeTeX, LibreOffice, Kate, <oXygen/>
> (commercial XML editor), but not in MS Office.
> Zdeněk Wagner


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