[HarfBuzz] New Indic standard?

Behdad Esfahbod behdad.esfahbod at gmail.com
Fri Aug 21 09:37:10 PDT 2009

On 08/21/2009 12:26 PM, Ed Trager wrote:
> OK, so to summarize based on Behdad's and Shriramana's responses:

Thanks Ed, that's a good summary.  I suggest also going through Pango Indic 
bugs reported upstream and in Red Hat bugzilla.  Make sure those sequences are 
included in the test data.


> (1) We need to compile the INPUT data : ideally a nicely organized and
> comprehensive set covering all the possible ligatures, conjuncts, etc.
> for the major Indic scripts.  That's "all" that Behdad needs.
> (2) We need to create a set of graphic images showing the *ideal*
> desired output.  I suppose the following sort of workflow might be
> possible:
>         (2.1). For the "NON-NATIVES" (like myself): compare PANGO vs.
> UNISCRIBE (maybe also vs. ATSUI) graphic renderings of the Unicode
> strings in the test data set:  Visual discrepancies form a "short
> list" of problematic entries that need to be passed on to the
> "NATIVES" for adjudication.
>         (2.2). The "NATIVES" like Shriramana will for the most part be
> able to just "eyeball" problematic or questionable forms.
>         (2.3) Hopefully some of the "NATIVES" are also picky
> typographers who can also point out cases that are technically
> "correct" but which suffer from poor or less-than-ideal placement of
> reph, diacritic vowels, poorly-joined "half" forms, etc.
> (3) Behdad will be motivated to add the necessary modifications to
> PangoView (to spit out the glyph IDs and positioning data that is
> needed for automated testing of the OUTPUT) once some intial
> compilation of data makes it worthwhile to do the work.
> (4) It would also be nice to eventually include in the test data cases
> covering the issues mentioned by Peter Constable in the Unicode Public
> Review Issues #37 "Proposal on Clarification and Consolidation of the
> Function
> of ZERO WIDTH JOINER in Indic Scripts".  Does anyone know if
> Constable's proposal is now accepted as part of the standard?
> - Ed
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