Re: ZWJ, ZWNJ and VS in Latin and other Greek-derived scripts

From: John Hudson (
Date: Thu Jan 25 2007 - 21:13:50 CST

  • Next message: John Hudson: "Re: ZWJ, ZWNJ and VS in Latin and other Greek-derived scripts"

    John H. Jenkins wrote:

    > (Which, BTW, is another reason why typographers hate the idea of
    > requesting ligatures in Latin text using ZWJ. They have to revamp
    > their fonts to support it, and it's a pain.)

    For AAT fonts, I presume this to be the case (not sure about Graphite). For OpenType,
    there is the option that layout engines could take a similar approach as they do for
    Indic, and treat ZWJ as a trigger for applying an OTL feature that would not require a ZWJ
    glyph in the lookup input. So, for instance, <f ZWJ i> could be taken as a trigger for all
    the ligature features in the font -- <liga> <rlig> <dlig> etc -- looking for an input
    match for <f i>.

    At the moment, though no layout engine seems to do this, and the mechanism to support ZWJ
    ligation relies on the presence of the ZWJ glyph in the input string for the <rlig> feature.

    John Hudson

    Tiro Typeworks
    Vancouver, BC
    Marie Antoinette was a woman whose core values were chocolate,
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