See comments and discussion on the list.

Not functional yet.

Untested.

Just read the comments...

So we can handle Sinhala split matras smartly...  Coming soon.

API additions:

	hb_segment_properties_t
	HB_SEGMENT_PROPERTIES_DEFAULT
	hb_segment_properties_equal()
	hb_segment_properties_hash()

	hb_buffer_set_segment_properties()
	hb_buffer_get_segment_properties()

	hb_ot_layout_glyph_class_t

	hb_shape_plan_t
	hb_shape_plan_create()
	hb_shape_plan_create_cached()
	hb_shape_plan_get_empty()
	hb_shape_plan_reference()
	hb_shape_plan_destroy()
	hb_shape_plan_set_user_data()
	hb_shape_plan_get_user_data()
	hb_shape_plan_execute()

	hb_ot_shape_plan_collect_lookups()

API changes:

	Rename hb_ot_layout_feature_get_lookup_indexes() to
	hb_ot_layout_feature_get_lookups().

New header file:

	hb-shape-plan.h

And a bunch of prototyped but not implemented stuff.  Coming soon.
(Tests fail because of the prototypes right now.)

WinXP doesn't include it.

To match upcoming API.

Two output formats for now: TEXT, and JSON.  For example:

  hb-shape --output-format=json

Deserialization API is added, but not implemented yet.

https://bugzilla.mozilla.org/show_bug.cgi?id=810823

Chromium Issue 158998:	Conditional jump in harfbuzz-ng
http://code.google.com/p/chromium/issues/detail?id=158998

As explained here:

  http://linux.thai.net/~thep/th-otf/shaping.html

Our output now matches Uniscribe for old fonts (eg. XP Tahoma) with no
Thai GSUB table.

It's a simple, right-to-left, script.