https://bugs.documentfoundation.org/show_bug.cgi?id=163215
Bug ID: 163215
Summary: Kashida justification does not work with AAT fonts
Product: LibreOffice
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: graphics stack
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: kha...@libreoffice.org
Currently we verify Kashida insertion positions with HarfBuzz to drop positions
where it is not safe to insert kashida without re-shaping (as we insert Kashida
after shaping). This works fine for OpenType fonts, but HarfBuzz does not (and
can not) do any such validation for AAT fonts, so all Kashida insertion
positions are considered invalid for such fonts and we get no Kashida insertion
at all.
AAT Arabic fonts are rather common on macOS (all Arabic fonts shipped by Apple
seem to be AAT fonts). A suggested fix is to not do any Kashida position
validation for AAT fonts, so basically revert to the old behavior. Almost all
Arabic AAT fonts are rather simple ones that do not do any complex
substitutions, so the validation is superfluous and no validation is better
than no Kashida justification.
For testing, if access to macOS system fonts is not possible,
http://wiki.irmug.com/index.php/X_Series_2 fonts can be used as they are hyprid
OpenType/AAT fonts (and HarfBuzz will use the AAT layout table so OpenType
layout tables are effectively ignored).
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