[Libreoffice-bugs] [Bug 52577] New: Right-hand part of vowel signs disappear when reordering numeric diacritics in Graphite font

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=52577

             Bug #: 52577
           Summary: Right-hand part of vowel signs disappear when
                    reordering numeric diacritics 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 64769
  --> https://bugs.freedesktop.org/attachment.cgi?id=64769
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 sample text is very simple.

When transliterating other Indic scripts into Tamil, since Tamil does not have
the full series of class consonants KA KHA GA GHA NGA etc but only has the
first and last members, KA and NGA, one uses 1 2 3 and 4 in either superscript
or subscript form for the missing letters. (Actually 1 is rarely seen but is an
optional choice sometimes required.) The Unicode Standard recommends the usage
of (00B9 and) 00B2 00B3 2074 (and 2081-2084) for the same.

The traditional placement of the numerical diacritic is as close to the
consonant as possible, but in logical order it has to follow the full CONSONANT
+ VOWEL_SIGN combination. This means reordering in the cases where there is a
vowel sign (or part thereof) to the right of the consonant.

I find that in the case of 00B9 00B2 and 00B3, after reordering, the right hand
side vowel sign has been gobbled up. This problem is not seen for the 20xx
characters.

For comparison I've included the output of XeTeX (which uses Gr1) which shows
the correct rendering.

It is also not a Gr2 bug, since gr2fonttest from graphite 1.1.3 outputs:

<quote>
$ gr2fonttest -codes font-grenabled.ttf 0b95 0bbe 00b9
Text codes
 b95     bbe      b9
pos  gid   attach            x       y  ins bw    chars         Unicode
00    65  -1 at 0,0           0.0     0.0   1  30    0   0     b95     b95
01   230  -1 at 0,0           7.7     0.0   1  30    2   2      b9      b9
02    88  -1 at 0,0          11.3     0.0   1  30    1   1     bbe     bbe
Advance width =   17.6

Char    Unicode Before  After
0       0B95    0       0
1       0BBE    2       2
2       00B9    1       1
</quote>

showing that the reordering has been done and the second glyph should display.

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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