[Libreoffice-bugs] [Bug 52575] New: 0310 COMBINING CANDRABINDU double-rendered in Graphite font

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=52575

             Bug #: 52575
           Summary: 0310 COMBINING CANDRABINDU double-rendered in Graphite
                    font
    Classification: Unclassified
           Product: LibreOffice
           Version: 3.7.0.0.alpha0+ Master
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
        AssignedTo: libreoffice-bugs at lists.freedesktop.org
        ReportedBy: samjnaa at gmail.com


Created attachment 64767
  --> https://bugs.freedesktop.org/attachment.cgi?id=64767
Test material to reproduce and test the bug

Please find attached a ZIP file with requisite test material. I've adapted the
Lohit Tamil font (https://fedorahosted.org/lohit/) to Graphite under the name
Krishna Tamil. (Note: I removed all OT tables.)

I've included the plain TTF without Graphite tables, the GDL and the compiled
Gr-Enabled TTF. Please install the Gr-Enabled font and open the ODT. 

The first page shows many instances of 0BCD TAMIL SIGN VIRAMA applied to
various Tamil clusters (whole set of Tamil syllables in fact). The combining
mark is programmed to be centered above its base and that it does. 

The next page shows the same text with 0310 COMBINING CANDRABINDU instead. You
can see that the candrabindu is duplicated in many cases. It seems that for
vowels U and after both as independent vowels and vowel signs (see fifth item
onwards per line) the duplication occurs. It also occurs for TTII (fifth row
fourth item). 

Curiously, if I break the line before any item with doubled candrabindu, the
doubling disappears for the first few items of the newly broken line. Again,
sometimes it's three items and sometimes it's four. 

For comparison I've included the output of XeTeX which does not duplicate the
candrabindu.

Bug reproducible on LibO 3.5.3 release version on Kubuntu Precise, 3.5.4 on Win
XP, and yesterday's daily* of 3.7.0 on Win XP.

* =
http://dev-builds.libreoffice.org/daily/Win-x86@6/master/2012-07-26_02.09.47/master~2012-07-26_02.09.47_LibO-Dev_3.7.0.0.alpha0_Win_x86_install_en-US.msi

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