Bug 39351

Summary:	incorrect FORMATTING of Arabic Subtending marks
Product:	LibreOffice	Reporter:	BobH <bobh528>
Component:	Writer	Assignee:	Not Assigned <libreoffice-bugs>
Status:	NEW ---	QA Contact:
Severity:	normal
Priority:	medium	CC:	dr.khaled.hosny, munzirtaha, sasha.libreoffice
Version:	3.4.1 release
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Subtending marks -- works with gedit Subtending marks -- fails with Writer Subtending marks -- test document

Description BobH 2011-07-18 12:51:43 UTC

Created attachment 49267 [details]
Subtending marks -- works with gedit

Brief:

With OpenType rendering, only one digit following a subtending mark (U+0600 .. U+0605, or U+06DD) is rendered correctly; 2nd and following digits are rendered normally.

Extended description:

Subtending marks (U+0600 .. U+0605, U+06DD) are typically followed by digits which, assuming appropriate font logic (OpenType, Graphite, etc), are then rendered with small glyphs positioned within (or above or below) the subtending mark. These are rendered correctly by gedit -- see attached "Subtending Marks -- gedit.jpg". 

NB: The font Scheherazade v1.0005 from https://scripts.sil.org/arabicfonts has the OpenType logic for subtending marks U+0600..U+0603 and U+06DD, and was used for this testing.  Any implementation will have limits on the number of digits supported -- Scheherazade supports up to 2, 3, or 4 digits depending on the subtending mark. I've also included writer doc "Subtending Marks.ODT" which contains test data.

LibreOffice 3.4.1 running on Windows appears to depend on Uniscribe for rendering, and works correctly for the digits from the Arabic block (U+0660 .. U+0669 and U+06F0 .. U+06F9) but not for the "Latin" digits (U+0030 .. U+0039). Nothing you can do about this.

However:

Writer from LibreOffice 3.4.1 on UBuntu 11.04 fails to correctly render more than one digit. That is, the first digit after the subtending mark is correct, subsequent digits are not.  See attached "Subtending Marks -- Writer.jpg"

Bob

Comment 1 BobH 2011-07-18 12:52:42 UTC

Created attachment 49268 [details]
Subtending marks -- fails with Writer

Comment 2 BobH 2011-07-18 12:53:12 UTC

Created attachment 49269 [details]
Subtending marks -- test document

Comment 3 Khaled Hosny 2011-12-07 23:15:04 UTC

This looks very suspiciously like a bug in ICU layout engine (which is what LO use on Linux). The only other application using ICU that I've is XeTeX, but there not even the first correct. This even seems to affect only Scheherazade, other fonts like Amiri (http://www.amirifont.org, disclaimer: mine) or even Arabic Typesetting seem to work fine (though both have different limit on the number digits than Scheherazade).

Comment 4 Björn Michaelsen 2011-12-23 12:21:49 UTC

[This is an automated message.]
This bug was filed before the changes to Bugzilla on 2011-10-16. Thus it
started right out as NEW without ever being explicitly confirmed. The bug is
changed to state NEEDINFO for this reason. To move this bug from NEEDINFO back
to NEW please check if the bug still persists with the 3.5.0 beta1 or beta2 prereleases.
Details on how to test the 3.5.0 beta1 can be found at:
http://wiki.documentfoundation.org/QA/BugHunting_Session_3.5.0.-1

more detail on this bulk operation: http://nabble.documentfoundation.org/RFC-Operation-Spamzilla-tp3607474p3607474.html

Comment 5 sasha.libreoffice 2012-01-27 10:57:27 UTC

reproduced in LibO 3.6.0 master on Fedora 64 bit

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