[HarfBuzz] question about indic matra group rule

[datao zhang]

> Date: Mon, 17 Jun 2013 08:52:47 +0100
> From: richard.wordingham at ntlworld.com
> To: harfbuzz at lists.freedesktop.org
> Subject: Re: [HarfBuzz] question about indic matra group rule
> 
> On Mon, 17 Jun 2013 12:06:43 +0800
> datao zhang <dataozhang at hotmail.com> wrote:
>  
> > I feel confuse for the syllable rule in
> > hb-ot-shape-complex-indic-machine.rl: halant_or_matra_group =
> > (final_halant_group | (h.ZWJ)? matra_group{0,4}); 
> > I can't image there any case for indic script which 4 matra followed.
> 
> I take it that by 'Indic script' you mean 'Indian Indic script'.  There
> are many words with 3 matras in Tibetan, and 4 different matras can
> occur with simple monosyllables in Tai Tham.  These, however, happen not
> to use the generic Indic shaper in HarfBuzz.
> 
> Informal Malayalam, however, does double some two-part vowels.
> 
> > Another issue is caused that you decompose matra before syllable
> > analysis and allow more than one matra followed. ex: if we have two
> > matras: (0xDD9,0xDD9). They will be treated as one syllable. I don't
> > know what benefit we can get from such rule.
> 
> Decomposition is usually easier than composition, and the two-part
> vowels need to be decomposed at some stage - consonant vowel ligatures
> generally work with parts rather than with whole vowels.
>  Anyway, it looks strange when (U+0D9A,U+0DDE,U+0DDE) combined as one syllable as in attachment. in windows 7, it looks like: കൌൌ
 
 

   
 


 

 
 

  

 

 Dean
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