From: Asmus Freytag (firstname.lastname@example.org)
Date: Mon Nov 03 2008 - 22:15:47 CST
On 11/3/2008 4:39 PM, John Hudson wrote:
> Kent Karlsson wrote:
>> It does NOT cover the RTL case, as I wrote. There is not
>> even a loophole (which I think is a bad approach anyway) in
>> the bidi algorithm that would cover Old Hungarian as RTL
>> overridden as LTR to even sometimes produce mirrored glyphs.
> POI: there is an OpenType working group who are spec'ing new layout
> features for LTR/RTL *glyph* mirroring, for inclusion in the v1.6 of the
> OT spec. Unicode provides for some mirroring at the character level,
Can you be a bit more precise as to where Unicode provides for mirroring
on the character level in your understanding. That's a subject rife with
potential misunderstandings, so it would be great to make sure there
aren't any involved this time.
> while other mirroring must happen at the glyph level, which implies font
> features; and of course the result of glyph mirroring must not reverse
> the result of character mirroring.
> I believe this approach will resolve the kind of glyph mirroring issues
> Kent describes. Indeed, Old Hungarian came up in our discussions as an
> example of a default RTL script that might require an <ltra> variant
> GSUB feature.
> John Hudson
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