[HarfBuzz] disabling Arabic shaping when direction is vertical

[Behdad Esfahbod]

On 14-09-23 04:20 AM, Behdad Esfahbod wrote:
> On 14-09-15 05:40 PM, Jonathan Kew wrote:
>> > Hi Behdad,
>> > 
>> > If the harfbuzz buffer direction is vertical (TTB or BTT), I think we should
>> > refrain from doing Arabic shaping.[1]
>> > 
>> > We could do this, for example, by adding an early return such as
>> >   if (unlikely (HB_DIRECTION_IS_VERTICAL (buffer->props.direction)))
>> >     return;
>> > in setup_masks_arabic(), so that the shaping analysis and setting of per-glyph
>> > features doesn't happen. WDYT?
> I can agree to that.  In that case, lets also not collect the features.

Bringing this back up so we fix.

-- 
behdad
http://behdad.org/