[HarfBuzz] Post Base Substitution fails with Malayalam repha

[Cibu Johny (സിബു)]

A related observation: The noto font does not seems to have this issue. It
does not have explicit <dot-reph, cha, virama, cha> glyph. The dot-reph
glyph is reordered to after the last virama.

Font is available at:
https://noto.googlecode.com/svn/trunk/fonts/individual/unhinted/NotoSansMalayalam.ttf



2013/9/14 Rajeesh K Nambiar <rajeeshknambiar at gmail.com>

> On Fri, Sep 13, 2013 at 5:41 PM, Rajeesh K Nambiar
> <rajeeshknambiar at gmail.com> wrote:
>
> >
> > I guess it would be easiest for us to update the fonts if Dotreph is
> > not reordered at all.
> > Also see an earlier discussion -
> > http://lists.freedesktop.org/archives/harfbuzz/2013-July/003433.html
> >
>
> Found another issue with Dotreph in conjunction with 'akhn' rules.
> Font Rachana:
> http://rajeeshknambiar.fedorapeople.org/smc-fonts-6.0/Rachana-6.0.ttf
> At the moment, it has 'akhn' rule for <Dotreph+Cha+Virama+Cha> mapped
> to glyph dotrephch1ch1.
>
> The word 'ചൎച്ച്' <Cha+Dotreph+Cha+Virama+Cha+Virama> is incorrectly
> shaped - the final Virama is reordered before
> <Dotreph+Cha+Virama+Cha>.
> hb-shape output: [ch1=0+1488|xx=1+184|dotrephch1ch1=1+1488]
> Correct output: [ch1,dotrephch1ch1,xx].
>
>
> ---
> Cheers,
> Rajeesh
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