[Bug 795327] Request to add Lohit Tamil Classical with old Tamil ligatures of -aa and -ai

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https://bugzilla.redhat.com/show_bug.cgi?id=795327

Shriramana Sharma <samjnaa at gmail.com> changed:

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--- Comment #1 from Shriramana Sharma <samjnaa at gmail.com> 2012-03-25 08:00:47 EDT ---
Created attachment 572521
  --> https://bugzilla.redhat.com/attachment.cgi?id=572521
Additional glyphs for classical Tamil orthography

Please find attached the finalized extra glyphs required for Classical Tamil
Orthography. Sorry for the delay in finalizing.

I have designed them based on existing glyphs so as to following the existing
design as far as possible. Hope you find them acceptable. I have also included
a PDF demonstrating the classical orthography using the new glyphs.

A few points:

The bearings of the additional glyphs for NNAA NNNAA and RRAA are the same as
those of RU because I felt that is the closest similar glyph but feel free to
change them. I notice that not all the glyphs have the same bearings, so you
probably know better than me what exact values to give.

But for the elephant's trunk (alternate form of ை to be used when combining
with ண ன ல ள) I find that allotting an RSB of -124 (minus 124) makes it
properly overlap the glyphs of the relevant consonants to give it the connected
appearance, because the consonants have LSB-s around 52-57. I have tested this
by zooming to 1000% to be sure that no minor gaps are present. 

I don't know why the LSB-s of the consonants are all different but again I
leave it to you to ensure that the elephant's trunk correctly overlaps with the
consonants. 

After importing the glyphs into the font and adding the requisite OT
programming, please post the font for testing. Thank you very much.

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