Re: Arabic & Arabic Extended Languages have 4 or 2 Glyps ...

From: peter_constable@sil.org
Date: Tue Dec 21 1999 - 08:37:03 EST


       Subject:
       Re: Arabic & Arabic Extended Languages have 4 or 2 Glyps for
       one
       ---------------------------------
       
       
       In fact, the best option is probably not exactly either:

       Map the glyph for the isolate from the cmap using the Unicode
       value in the Arabic block; if you use glyphs that correspond to
       characters in the compatibility areas (>= U+FB00), then also
       map these glyphs from the cmap using the Unicode values in that
       range. For any other glyphs, however, do not map them directly
       from the cmap; i.e. don't assign them to *any* Unicode value,
       PUA or otherwise. These glyphs should only be accessible using
       OpenType substitution tables.

       You'll be able to create OpenType tables using a tool that MS
       will be making available soon - VOLT (Visual OpenType Layout
       Tool). Check out http:
       //www.microsoft.com/typography/creators.htm for further
       details, and/or join the OpenType list.

       Peter

       From: <liwal@liwal.net> AT Internet on 12/21/99 03:31 AM

       Received on: 12/21/99

       To: Peter Constable/IntlAdmin/WCT, <unicode@unicode.org> AT
             Internet@Ccmail
       cc:
       Subject: Arabic & Arabic Extended Languages have 4 or 2 Glyps
             for one


       Hi;

       I am developing a Unicode base font for Windows 2k, the font
       have Glyps for 4 Languages i.e. Pashto, Farsi, Urdu and Arabic.
       Arabic & Arabic Extended
        Languages have 4 or 2 Glyps for one letter i.e Isolated,
       Intial, Middle, Final Forms.

       Therefore, I assigned the Unicode Code to the Isolated form and
       planning to use Private Use Area for others, but there are some
       of the Glyps found in "Arabic Presentation Form A" compatablity
       Area which confused me that:

       1- I should use Glyps found in "Arabic Presentation Form A" and
       assing onthers values from private use Area?

       or

       2- Ignor Compatability Area codes and assinge new codes from
       Private Area?

       Wish you all the best.

       N.R.Liwal



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