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RE: Mirroring Unicode symbols in Arabian

From: Paul Topping <pault@dessci.com>
Date: Wed, 20 Feb 2013 19:07:20 +0000
To: Khaled Hosny <khaledhosny@eglug.org>, Murray Sargent <murrays@exchange.microsoft.com>
CC: Neil Soiffer <neils@dessci.com>, Kent Karlsson <kent.karlsson14@telia.com>, David Carlisle <davidc@nag.co.uk>, "Daniel Marques" <dani@wiris.com>, "www-math@w3.org" <www-math@w3.org>
Message-ID: <B6C5B1ABA88AF446821B281774E6DB710D6E4D@FERMAT.corp.dessci>
If access to these characters requires use of this OpenType feature, does it imply that such characters will not be accessible from applications that simply process Unicode text strings (eg, web browsers and most other apps)?


> -----Original Message-----
> From: Khaled Ghetas [mailto:dr.khaled.hosny@gmail.com] On Behalf Of
> Khaled Hosny
> Sent: Wednesday, February 20, 2013 9:34 AM
> To: Murray Sargent
> Cc: Neil Soiffer; Kent Karlsson; David Carlisle; Daniel Marques; www-
> math@w3.org
> Subject: Re: Mirroring Unicode symbols in Arabian
> Right, that is is more or less the what is OpenType specification is
> saying, and indeed XITS Math should be fixed to follow the
> specification
> (it was done that way to simplify testing since the system I was using
> wasn't applying the Bidi algorithm).
> http://www.microsoft.com/typography/otspec/TTOCHAP1.htm#ltrrtl

> On Wed, Feb 20, 2013 at 04:35:54PM +0000, Murray Sargent wrote:
> > I think that mirrored characters than don't have a mirrored character
> > counterpart should be accessed by the 'rtlm' OpenType feature. But
> > those that do have a mirrored character counterpart should not use
> the
> > 'rtlm' feature since else they'll get remirrored when shaped. This is
> > the approach I used in my RTL math zone prototype for MathML 3. I
> have
> > a special copy of Cambria Math with 'rtlm' features for various
> > operators such as integrals and summations. The approach works well.
> > The font isn't complete enough though for more than just prototyping.
> >
> > Murray
> >
> > Khaled Ghetas noted:
> >
> > XITS Math fonts has mirrored math characters, but they are accessible
> > only with 'rtlm' OpenType feature (but it is possible to build a
> > special version of it with the RTL glyphs as the default).
> > https://github.com/khaledhosny/xits-math

Received on Wednesday, 20 February 2013 19:07:54 UTC

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