Re: Question about the directionality of "Old Hungarian" (document N3531)

From: Asmus Freytag (
Date: Mon Nov 03 2008 - 22:15:47 CST

  • Next message: Kent Karlsson: "RE: Question about the directionality of "Old Hungarian" (document N3531)"

    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

    This archive was generated by hypermail 2.1.5 : Mon Nov 03 2008 - 22:19:02 CST