Bug 70509

Summary:	Candrabindu+Visarga doesn't work in Devanagari
Product:	HarfBuzz	Reporter:	Roozbeh Pournader <roozbeh>
Component:	src	Assignee:	Behdad Esfahbod <freedesktop>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	freedesktop
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Roozbeh Pournader 2013-10-15 20:38:31 UTC

According to one of our Sanskrit contacts, the following combination is valid in Sanskrit. But it results in a dotted circle in HarfBuzz:

रुँः

The sequence is:
U+0930 U+0941 U+0901      U+0903
RA     U      CANDRABINDU VISARGA

Comment 1 Roozbeh Pournader 2013-10-15 20:41:55 UTC

Here's what Peter Constable has written about it <http://www.unicode.org/mail-arch/unicode-ml/y2009-m05/0026.html>:

"As for combinations of candrabindu and visarga, unfortunately there were some early decisions in Uniscribe to impose certain restrictions on Indic sequences, and while I've worked at getting those relaxed in sensible ways this is one restriction that is still there -- a known issue that I plan to have eliminated in a future version."

Comment 2 Behdad Esfahbod 2013-10-16 09:18:45 UTC

Will be fixed in tonight's push.commit 5c558877da5db8c734ba072f01e5e4797876619c
Author: Behdad Esfahbod <behdad@behdad.org>
Date:   Wed Oct 16 11:14:15 2013 +0200

    [indic] Allow up to two syllable modifiers
    
    Bug 70509 - Candrabindu+Visarga doesn't work in Devanagari
    https://bugs.freedesktop.org/show_bug.cgi?id=70509
    
    We categorize both bindus and visarga as syllable-modifiers.
    OT spec doesn't actually say what characters go in the syllable
    modifier category, and allows one.  We just allow up to two now.
    
    Test case: U+0930,U+0941,U+0901,U+0903
    
    Uniscribe currently doesn't support that and produces a
    dotted circle.

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