[HarfBuzz] List OpenType features

[Edu García]

It worked, as expected :).

However, I'm getting some curious results, and I'm not sure if it's because
of my C rustiness or the fact that I'm running Harfbuzz with Emscripten,
but just in case, I'll ask:

With this simple code:

unsigned int count = 80;
hb_tag_t myResult[count];
hb_ot_layout_table_get_feature_tags(hb_font_get_face(hb_font),
HB_OT_TAG_GSUB, 0, &count, myResult);

...I'm getting exactly 11 copies of every tag inside the myResult array (so
positions 0-10 contain "aalt", positions 11-21 contain "c2sc", etc).

Is this expected, a bug (I'm using 1.0.6) or am I doing something glaringly
wrong there?

Thanks, and sorry for the annoying questions :)

On Thu, Nov 19, 2015 at 7:13 AM, Edu García <arcnorj at gmail.com> wrote:

> Thank you both, that's very helpful!
>
> I'll give it a try later, and maybe open a PR to add doc to them (the lack
> of docs is a bit problematic for a project this complex)
> On Nov 18, 2015 11:43 PM, "Adam Twardoch (List)" <list.adam at twardoch.com>
> wrote:
>
>>
>> > On 18 Nov 2015, at 13:40, Nikolay Sivov <bunglehead at gmail.com> wrote:
>> >
>> > On 18.11.2015 15:27, Edu García wrote:
>> >> Thank you!
>> >>
>> >> That's the one I suspected. However, as its second parameter, it wants
>> a
>> >> "hb_tag_t table_tag". What is that table tag, and how do I get it?
>> >
>> > There's only two possible tags you can use in this case -
>> HB_OT_TAG_GSUB and HB_OT_TAG_GPOS.
>>
>> Yes, giving HB_OT_TAG_GSUB will get you the list of substitution features
>> in the font and HB_OT_TAG_GPOS will give you the list of positioning
>> features. GSUB features are always applied before GPOS features. It's
>> possible that the same feature is defined in both tables, then the GSUB
>> portion of the feature will be applied first, GPOS later.
>>
>> A.
>>
>>
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