RE: [Indic-computing-devel] Testing OpenType support

[Andy W. <And...@bt...>]

Arun M wrote:

> >   In Devanagari what should be the output of a sequence like
> > 
> > <consonant><virama><ZWNJ>
> > 
> > Should we apply 'haln' feature of OpenType here ?
> 
> 
>   No response :( 
> 
> Is it because i was not clear or on one know how devanagari works ?

I did not answer - I was sure that someone else would!
(The answer is yes)

> ICU and Pango renderer allows 'haln'  form of the consonant 
> when a sequence like one above comes. For Malayalam its not 
> the right thing. 
> So just wanted to know if its special case for Malayalam.

I am confused. Why do you think that this is not the right thing for
Malayalam?
According to the Unicode encoding model, consonant + virama + ZWNJ
should render a visible Halant. In Uniscribe, ICU and Pango, this causes
lookups in feature 'haln' to be applied. Therefore the feature 'haln'
should only be used to create visible Halant forms of consonants. Do you
think that is wrong for Malayalam?

Andy