[HarfBuzz] Fwd: Properly Rendering (Tamil-)Brahmi Short E/O

[Richard Wordingham]

On Fri, 20 Jul 2018 00:04:07 +0200
Vinodh Rajan <vinodh at virtualvinodh.com> wrote:

> I am not sure if this is due to HB doing incorrect clustering of
> Brahmi syllables or just incorrect
> OT features in my font.

There is a further issue.  Is <consonant1, sign_e, virama, consonant2>
a correct Brahmi sequence for two syllables?  I suspect this will be
split up by HarfBuzz as <consonant1, sign_e> <U25CC_glyph, virama,
consonant2>, as seems to happen with Tai Tham.  I'm going by my Tai
Tham font that doesn't attempt to correct the USE, Da Lekh Seri - I am
very rushed at the moment. This would fall foul of the combination of
virama with a consonant that needs to happen before Indic
rearrangement.  If the correct encoding is <consonant1, sign_e, virama,
ZWNJ, consonant2>, then my simple hack should work well. 

Richard.