Bug 90962

Summary:	Nice to have an API to retrieve ligature related information.
Product:	HarfBuzz	Reporter:	Hak Matsuda <hakuro>
Component:	src	Assignee:	Behdad Esfahbod <freedesktop>
Status:	NEEDINFO ---	QA Contact:
Severity:	normal
Priority:	medium	CC:	freedesktop
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Hak Matsuda 2015-06-13 01:38:16 UTC

AFAIK, there is no API to retrieve a ligature information (if a glyph is a ligature).
hb_ot_layout_get_ligature_carets() only works when a OT font supports the information.
If there is an API that can retrieve,
- If the glyph is a ligature,
- How many caret positions it may have,
that would be handy.
For now, those need to be retrieved with a conjunction of other line breaking components.

Comment 1 Behdad Esfahbod 2015-06-16 06:45:19 UTC

Hi Hak,

What do you exactly need to do?  Some of that information is returned as part of shaping result in the cluster field.

hb_ot_layout_get_glyph_class() is also close.  But as you noted, again, this depends on what the font developer decided to set for glyph class and has no meaning outside the font.

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