[HarfBuzz] hangul shaper patches

[Roozbeh Pournader]

Jonathan,

I was wondering if the new patches would have all the canonically
equivalent characters sequences rendered the same way. Microsoft people
have said publicly that their Hangul shaper intentionally doesn't do that.


On Sun, Jan 19, 2014 at 5:30 PM, Jonathan Kew <jfkthame at googlemail.com>wrote:

> Hi Behdad,
>
> I'm attaching a series of patches for improvements to the Hangul shaper.
> These provide support for Old Hangul sequences that do not have a
> precomposed Unicode form, and handle the tone-mark reordering.
>
> With these patches, we exactly match uniscribe on the wikipedia test
> corpus using malgun.ttf, except for (a) cases where there's a character
> that's not supported in the font, so uniscribe gives .notdef but harfbuzz
> finds a compatibility fallback, and (b) a handful of words where there's an
> <LV, T> sequence that uniscribe doesn't support (it has no corresponding
> LVT syllable), but we handle by decomposing to <L, V, T> and applying jamo
> features.
>
> JK
>
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