[HarfBuzz] Arabic: lookup order vs. feature order

[Eric Muller]

Thanks.

I tried with Uniscribe, and it seems that HB applies calt and liga 
together in lookup order, while Uniscribe applies each feature 
independently. I put the details in the issue.

Eric.

On 7/11/17 2:15 AM, Behdad Esfahbod wrote:
> Hi Eric,
>
> We try to follow Uniscribe very closely.  See:
>
> https://github.com/behdad/harfbuzz/blob/master/src/hb-ot-shape-complex-arabic.cc#L181
>
> I'll follow up with your issue on github.
>
> b
>
> On Tue, Jul 11, 2017 at 4:11 AM, Eric Muller <emuller at amazon.com 
> <mailto:emuller at amazon.com>> wrote:
>
>     If I read the Microsoft spec for Arabic, it seems pretty clear
>     that features should be applied one by one, in a specified order.
>     On the other hand, I have the impression that Harfbuzz applies the
>     lookups in lookup order. Is that the case?
>
>     Evidence at <https://github.com/behdad/harfbuzz/issues/505
>     <https://github.com/behdad/harfbuzz/issues/505>>.
>
>     Thanks,
>     Eric.
>
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>
>
>
>
> -- 
> behdad
> http://behdad.org/

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