https://bugzilla.redhat.com/show_bug.cgi?id=1001645

That moment that you have to accept that you made API mistakes...

Initial setup of gtk-doc. Straight forward setup following the gtk-doc
instructions. Ignore some troublesome types in src/hb-gobject.h. To
build use "./autogen.sh --enable-gtk-doc" then "make". Docs are in
harfbuzz/docs/reference/html/index.html.

See discussion on the list in the thread "Arabic presentation forms
and the uniscribe backend".

Based on patch from Jonathan Kew.

Based on patch from Jonathan Kew and data from Apple.

It's not working correctly though, and I suspect I'm hitting a bug in
CoreText.  When I do this:

hb-shape /Library/Fonts/Zapfino.ttf ZapfinoZapfino --shaper coretext \
--features=-liga

I expect both ligatures to turn off, but only the second one does:

[Z_a_p_f_i_n_o=0+2333|Z=7+395|a=8+285|p_f=9+433|i=11+181|n=12+261|o=13+250]

whereas if I disable 'dlig' instead of 'liga', both are turned off.
Smells...

Doesn't resolve conflicting feature settings.

Rename HB_SCRIPT_CANADIAN_ABORIGINAL to HB_SCRIPT_CANADIAN_SYLLABICS
and a macro for the old name.

Doesn't matter for most users since they should be working in a
fixed sub-pixel scale anyway (ie. 22.10, 26.6, 16.16, etc).

See thread by John Dagget on the list.

Unlike AAT, looks like with CoreText very few OT features can be mapped.
:(

This reverts commit 95212100.

In light of discussion on the mailing list...

As Khaled pointed out, right now setting any features, turns kern
and possibly other features off.

Turning features on globally works now.

As reported by cibu.  Untested.

Windows 8 doesn't, and the spec will be fixed.

Patch from Jonathan Kew.

According to Andrew Glass: "The issue with Myanmar <mark> feature was
fixed via a servicing patch as soon as Windows 8 became available."