[luatex] tibetan font support

[Khaled Hosny]

Well, I was wrong. A quick search returns that Tibetan OpenType fonts
doesn't need any special handling (i.e. shaper), only ccmp, blws, abvs,
blwm, abvm, calt, and kern features are needed which is already
supported.
The attached ConTeXt file seems to render OK in my eyes, but I don't
read Tibetan, I just compared it with the same string rendered in
Firefox (I used TibetanMachineUniAlpha.ttf font, ttf-tmuni package in
debian).

Regards,
 Khaled

On Wed, Jul 08, 2009 at 01:47:36AM +0300, Khaled Hosny wrote:
> AFAIK, the OpenType layout code that Hans wrote doesn't have an Indic
> shaper, only LGC, Arabic, and CJK scripts are supported. IMO, OpenType
> support for Indic scripts is where you need to look.
> 
> Regards,
>  Khaled
> 
> On Tue, Jul 07, 2009 at 05:09:23PM +0200, Norbert Preining wrote:
> > Hi everyone,
> > 
> > I am confronted with my past when I studied Tibetan, and helped people
> > setting tibetan, at that time with omega.
> > 
> > Now we have many more freely available fonts and I want to make them
> > available for (la)tex, based on luatex, aleph, or whatever.
> > 
> > Tibetan is written a bit like Sanskrit, so you have consonant-stacks.
> > Finally fonts are somehow *decent* that they follow the same layout:
> > 
> > Normal Unicode glyphs are in the *right* positions, so tibetan ka in
> > 0F40, etc.
> > 
> > And consonant stacks that are pre-formed are saved in some private area
> > but with names conforming to what Adobe recommends. So
> > 
> > ka = 0F40
> > ya-subscript = 0FB1
> > 
> > so the pre-formed glyph kya is called "uni0F400FB1"
> > and so on with more (2,3,4) uni chars.
> > 
> > Now my question: Is there any way to handle that *automatically* in
> > luatex? Or has anyone written a automatic OTP conversion tool that does
> > this? The idea is:
> > - basic mappings from latin chars/ascii chars to tibetan letters are
> >   defined
> > - if a combination of uni chars are found and the combined letter is
> >   found (searching longest match first) the string is replaced by
> >   the respective glyph uniXXXXYYYY etc
> > 
> > Thanks a lot and all the best
> > 
> > Norbert
> > 
> > -------------------------------------------------------------------------------
> > Dr. Norbert Preining <preining at logic.at>        Vienna University of Technology
> > Debian Developer <preining at debian.org>                         Debian TeX Group
> > gpg DSA: 0x09C5B094      fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
> > -------------------------------------------------------------------------------
> > ADLESTROP (n.)
> > That part of a suitcase which is designed to get snarled up on
> > conveyor belts at airports. Some of the more modern adlestrop designs
> > have a special 'quick release' feature which enables the case to flip
> > open at this point and fling your underclothes into the conveyor
> > belt's gearing mechanism.
> > 			--- Douglas Adams, The Meaning of Liff
> 
> -- 
>  Khaled Hosny
>  Arabic localiser and member of Arabeyes.org team
>  Free font developer

-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer
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