[XeTeX] problem rendering unicode Devanagari dependent vowel signs and ligatures

[Dominik Wujastyk]

Ah, very interesting!
Dominik

On 3 February 2011 08:20, Leo Brouwer <singhadaya at googlemail.com> wrote:

> I've run Richard's sample (with devamt.ttf, the IBM version of Devanagari
> MT---apparently not an exact equivalent, as it doesn't render "trya"
> correctly), and it appears to me that it's not the fonts, but the lack of*
>  *Script=Devanagari in the font options that's causing the difference.
> Using velthuis-sanskrit mapping *without *Script=Devanagari displays
> visarga & dependent vowels without the circle for *all *fonts I've tried.
> It also doesn't form conjuncts correctly, however. Strangely enough, leaving
> out the script option doesn't seem to make a difference when using Romdev
> mapping, or when inputting Devanagari directly.
>
> \documentclass{article}
>
>  \usepackage{fontspec}
>
> \usepackage{xltxtra}
>
> \usepackage{xunicode}
>
>
>  \newfontfamily{\DMTAFont}[Mapping=velthuis-sanskrit]{Devanagari MT for
> IBM}
>
> \newfontfamily{\DMTBFont}[Mapping=velthuis-sanskrit,
> Script=Devanagari]{Devanagari MT for IBM}
>
>  \newfontfamily{\NakulaAFont}[Mapping=velthuis-sanskrit]{Nakula}
>
> \newfontfamily{\NakulaBFont}[Mapping=velthuis-sanskrit,
> Script=Devanagari]{Nakula}
>
>
>  \begin{document}
>
>
>  Devanagari MT without Script=Devanagari: {\DMTAFont .h .m atrya
> \char"0903 \char"093E}
>
>
>  Devanagari MT: {\DMTBFont .h .m atrya \char"0903 \char"093E}
>
>
>  Nakula without Script=Devanagari: {\NakulaAFont .h .m atrya \char"0903
> \char"093E}
>
>
>  Nakula: {\NakulaBFont .h .m atrya \char"0903 \char"093E}
>
>
>  \end{document}
>
> Thank you for bringing this to my attention; for now, I'll just make some
> macros with velthuis mapping & script turned off for the characters I need.
>
>
> I wonder how much of this is XeTeX and how much of this is an issue of font
>> encoding and design, although I know very little about the internals of
>> either.
>
>
> Yes, I've wondered about this also. Most of the fonts that don't work in
> XeTex display correct conjuncts in word processors, web browsers, etc., so
> it does seem to be something specific about Xetex that's causing the fonts
> to malfunction.
>
> Sincerely,
>
> Leo Brouwer
>
>
>
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