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 <[email protected] <mailto:[email protected]>> 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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