[Webkit-unassigned] [Bug 101239] Add layout test for handling of ZWJ/ZWNJ in Indic scripts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101239


Glenn Adams <glenn at skynav.com> changed:

           What    |Removed                     |Added
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                 CC|                            |eric at webkit.org,
                   |                            |glenn at skynav.com




--- Comment #1 from Glenn Adams <glenn at skynav.com>  2012-11-05 12:34:10 PST ---
(In reply to comment #0)
> Arabic font does not seems to have any rules based on Zj.

Unicode *does* define shaping behavior around ZWJ/ZWNJ for Arabic script, e.g., see [1], starting on page 252, "The Non-joiner and the Joiner".

[1] http://www.unicode.org/versions/Unicode6.1.0/ch08.pdf

However, in the case of OpenType fonts using GSUB, the font does not typically encode semantic rules around this behavior. Instead, the char/glyph engine (e.g., harfbuzz, etc), would directly implement these semantics in order to determine if contextual substitution, e.g., whether init/medi/fina features, etc., should apply or not.

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