[Bug 484536] New: various smc-fonts have wrong default glyphs

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Summary: various smc-fonts have wrong default glyphs

https://bugzilla.redhat.com/show_bug.cgi?id=484536

           Summary: various smc-fonts have wrong default glyphs
           Product: Fedora
           Version: rawhide
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: medium
          Priority: low
         Component: smc-fonts
        AssignedTo: psatpute(a)redhat.com
        ReportedBy: roozbeh(a)gmail.com
         QAContact: extras-qa(a)fedoraproject.org
                CC: fedora-fonts-bugs-list(a)redhat.com,
                    psatpute(a)redhat.com, rajeeshknambiar(a)gmail.com,
                    fedora-i18n-bugs(a)redhat.com
    Classification: Fedora


Various fonts in the smc-fonts package, especially smc-fonts-meera, which is
installed on every Fedora machine because of being being "default" in compts,
have default glyphs shaped like an R in circle for some Malayalam characters.

For example, Meera has the following default glyphs in places that it should
not have: U+0D44, U+0D62, U+0D63, U+0D71, U+0D72, U+0D73, U+0D74, U+0D79,
U+0D7A, U+0D7B U+0D7C, U+0D7D, U+0D7E, U+0D7F

Also, there are several default glyphs in places that Unicode may use for
future encoding of Malayalam characters, like U+0D00 and U+0D29.

All those R in cirlces should be removed from the font, to make the font
Unicode-complying. Alternatively, Meera can be replaced by a standard font.

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[Bug 484536] various smc-fonts have wrong default glyphs

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--- Comment #1 from Santhosh Thottingal <santhosh.thottingal(a)gmail.com&gt;  2009-02-08
04:04:21 EDT ---
The following code points were added to Unicode 5.1 by Unicode consortium
0D7A MALAYALAM LETTER CHILLU NN(ണ്‍)
0D7B MALAYALAM LETTER CHILLU N(ന്‍)
0D7C MALAYALAM LETTER CHILLU RR(ര്‍)
0D7D MALAYALAM LETTER CHILLU L(ല്‍)
0D7E MALAYALAM LETTER CHILLU LL(ള്‍)
0D7F MALAYALAM LETTER CHILLU K(ക്‍)
Please note that these glyphs are already present in Malayalam(ml_IN) fonts and
mapped to
ണ +  ്  + zwj,
ന + ് + zwj
ര + ്  + zwj
ല + ്  + zwj
ള + ് + zwj
ക + ് + zwj
respectively.
Large amount of data encoded using this standard(5.0) is present in digital
format. By duplicating the encoding by defining new code points for these
glyphs, Unicode brought dual encoding issue for
Malayalam. Dual encoding without canonical equivalence brings chaos to Unicode
Malayalam including security issues. And it makes existing application buggy
while handling Malayalam. So accepting these code
points to our application should be done with extreme care. We should keep
backward compatibility and at the same time we should avoid dual encoding.
There are two options:

a) Unicode consortium should define canonical equivalence between the existing
representation and newly defined duplicate code points
b) Unicode consortium should deprecate the new code points(this is recommended,
since the new code points does not bring any advantage other than issues to
existing data and application both in technical
and security aspects )

It is because of this reason , Swathanthra Malayalam Computing(SMC), the FOSS
developer community which develops/maintains these fonts decided to postpone
adding these glyphs to fonts(Not only to fonts,
but existing applications too) until Unicode resolve the above mentioned
issues. SMC had already informed Unicode about the problems by the document No:
L2/08-038. You can see a copy here
http://wiki.smc.org.in/images/2/23/SMC_Unicode_5.1.pdf. If this bug is a
serious concern for you, you may also contact Unicode consortium to resolve the
issue asap.

 Unicode 5.1 compliance means backward compatibility to 5.0 and older versions
also. If we want to keep backward compatibility we should keep the existing
glyph-code-point mapping. At the same time if we
duplicate those glyphs for another code point in the font, that is a serious
issue.

This bug should postponed till Unicode take any decision on this problem.

Regarding other new code points in Unicode 5.1 version,  we are planning to add
those glyphs to fonts in their next versions(No font in Malayalam has those
glyphs as of now). The R sign in the unassigned
code point positions will be removed as and when Unicode defines characters for
them in future.

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[Bug 484536] various smc-fonts have wrong default glyphs

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Pravin Satpute <psatpute(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |i18n




--- Comment #2 from Pravin Satpute <psatpute(a)redhat.com&gt;  2009-02-09 02:04:09 EDT
---
santhosh,
thanks for update

chill characters are from 7A to 7F so if we are not supporting those characters
we can simply keep blank at those position
but adding shape Ⓡ which has different unicode value U+24c7 in those places
make this font Unicode incompatible

u+ 0d44
u+ 0d62
u+ 0d63
U+ 0d70 -  wrong shape
U+ 0d71
U+ 0d72
U+ 0d73
U+ 0d74
U+ 0d75

also above are some more places where unicode has given shapes then also meera
has Ⓡ sign there
this is wrong
and it makes it unicode incompatible (some out of these are added in Unicode
5.1 in that case only blank is require)

IMHO we do not need to put R shapes in Reserved spaces as those code point are
already not implemented in any application (pango, qt), typing is also not
allowed for those characters and adding those shapes in font increasing its
size unnecessarily

i think there is no harm in removing those shapes from font

It will be very good if we can say Meera font is Unicode 5.0 compatible :)

Roozbeh
Thanks for notifying these thing

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[Bug 484536] [ml_IN] various smc-fonts have wrong default glyphs

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Pravin Satpute <psatpute(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|various smc-fonts have      |[ml_IN] various smc-fonts
                   |wrong default glyphs        |have wrong default glyphs




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[Bug 484536] [ml_IN] various smc-fonts have wrong default glyphs

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--- Comment #3 from Rajeesh <rajeeshknambiar(a)gmail.com&gt;  2009-04-14 05:18:39 EDT
---
smc-fonts-meera and smc-fonts-rachana are updated by removing the Ⓡ shapes. We
are in the process of updating other fonts in the group also. As soon as a new
upstream release is made, I will update and rebuild the fonts.

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[Bug 484536] [ml_IN] various smc-fonts have wrong default glyphs

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--- Comment #4 from Pravin Satpute <psatpute(a)redhat.com&gt;  2009-04-14 05:34:58 EDT
---
thanks for update.

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[Bug 484536] [ml_IN] various smc-fonts have wrong default glyphs

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--- Comment #6 from Rajeesh <rajeeshknambiar(a)gmail.com&gt;  2009-08-18 12:34:46 EDT
---
Fixed all the bugs identified in Meera in new upstream source archive
http://download.savannah.gnu.org/releases/smc/fonts/malayalam-fonts-04.2.zip

Updated smc-fonts package, koji build here :
http://koji.fedoraproject.org/koji/taskinfo?taskID=1612642

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[Bug 484536] [ml_IN] various smc-fonts have wrong default glyphs

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Pravin Satpute <psatpute(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |CLOSED
         Resolution|                            |RAWHIDE




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[Bug 484536] [ml_IN] various smc-fonts have wrong default glyphs

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Praveen Prakash <me.praveen(a)gmail.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |me.praveen(a)gmail.com

--- Comment #7 from Praveen Prakash <me.praveen(a)gmail.com&gt; 2010-02-08 10:32:13 EST
---
This bug cannot closed this way. I'm using ubuntu, so I am not directly aware
this problem from this OS. But from the comments in the ubuntu bug
https://bugs.launchpad.net/ubuntu/+source/ttf-indic-fonts/+bug/515607, I
believe same is here.

Now large amount of user data is coming in Unicode 5.1. So I request font
update to include unicode 5.1 values.

Thanks

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[Bug 484536] [ml_IN] various smc-fonts have wrong default glyphs

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--- Comment #8 from Nicolas Mailhot <nicolas.mailhot(a)laposte.net&gt; 2010-02-09
04:12:26 EST ---
Those are two different problems.

Removing erroneous glyphs is an easy technical fix.
Extending glyph coverage is something else entirely.

It is legitimate to request the second but please do it in a specific bug
report.

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