[PATCH 5/5] usp10/tests: Add shaping tests for fLogicalOrder and fRTL.

[Henri Verbeet]

On 7 March 2017 at 08:21, Henri Verbeet <hverbeet at gmail.com> wrote:
> On 7 March 2017 at 04:30, Sebastian Lackner <sebastian at fds-team.de> wrote:
>> Is this a problem with the fonts shipped on Archlinux, or is something
>> going wrong on the Wide side? The font "Estrangelo Edessa" is provided
>> by /usr/share/fonts/OTF/SyrCOMEdessa.otf which can be downloaded at
>> https://www.archlinux.org/packages/extra/any/xorg-fonts-misc/download/.
>> If you need any logs or want me to open a bug report, please let me
>> know.
>>
> It seems likely that it's related to the font in some way, although
> without looking further into it I couldn't say whether that's because
> the font is e.g. missing a ligature or usp10 applying a feature
> incorrectly. Do you know whether it works correctly with the font from
> e.g. Windows 7?
So I looked into this a bit, and it looks like that while the
Microsoft font has a single glyph for the lamadh-alaph ligature, the
Arch font constructs that ligature out of 3 separate glyphs. Both are
legitimate, but they're different from each other.