[Bug 1078661] New: Deprecate the usage of U+0BB8 U+0BCD U+0BB0 U+0BC0 for SRII per latest unicode standard

bugzilla at redhat.com bugzilla at redhat.com
Thu Mar 20 06:41:42 UTC 2014


https://bugzilla.redhat.com/show_bug.cgi?id=1078661

            Bug ID: 1078661
           Summary: Deprecate the usage of  U+0BB8 U+0BCD U+0BB0 U+0BC0
                    for SRII per latest unicode standard
           Product: Fedora
           Version: rawhide
         Component: lohit-tamil-fonts
          Severity: medium
          Assignee: psatpute at redhat.com
          Reporter: srik.lak+public at gmail.com
        QA Contact: extras-qa at fedoraproject.org
                CC: fonts-bugs at lists.fedoraproject.org,
                    i18n-bugs at lists.fedoraproject.org, psatpute at redhat.com



Description of problem:

Complex glyph SRI was changed from  U+0BB8 U+0BCD U+0BB0 U+0BC0 to  U+0BB6
U+0BCD U+0BB0 U+0BC0 in Unicode 4.1. Lohit-Tamil displays the complex glyph for
both forms for backward compatibility. However this also prevents migration to
latest standard as some input tools too offer same functionality leading to
more content created with U+0BB8 U+0BCD U+0BB0 U+0BC0 as SRI which increases
the need for backward compatibility. To break this vicious cycle, I propose
U+0BB8 U+0BCD U+0BB0 U+0BC0 should not be substituted with complex glyph SRI
and should be displayed normally. Apple / iOS fonts already do this complying
with latest unicode standard. Failing to move to single consistent
representation in line with latest unicode leads to fragmentation within
unicode text, a greater cause for worry than backward compatibility.

I understand the larger problem of standardization cannot happen only by
changing this font, but its a start and Lohit being the only maintained free
Tamil font, can help in the process.

Version-Release number of selected component (if applicable):
2.5.3

How reproducible:
Always 

Steps to Reproduce:
1. ஸ்ரீ (U+0BB8 U+0BCD U+0BB0 U+0BC0) should be displayed as ஸ்(U+0BB8 U+0BCD)
ரீ(U+0BB0 U+0BC0) without a space in middle and not compounded form.

Actual results:
U+0BB8 U+0BCD U+0BB0 U+0BC0 giving complex glyph SRI

Expected results:
U+0BB8 U+0BCD U+0BB0 U+0BC0 should not give complex glyph SRI, should give
U+0BB8 U+0BCD and U+0BB0 U+0BC0 seperately.

Change Required:
The line 

Ligature2: "'abvs' Above Base Substitutions in Tamil lookup 0 subtable"
u0BB8_u0BCD.half u0BB0 u0BC0

in Lohit-Tamil.sfd should be removed.

Additional info:
See also bug 450699

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