[HarfBuzz] Hangul shaping

[Behdad Esfahbod]

Hi,

Can someone please explain Hangul OpenType shaping to me?

I'm trying to understand the ICU Hangul shaper:

http://bugs.icu-project.org/trac/browser/icu/trunk/source/layout/HangulLayoutEngine.cpp

>From what I understand, it decomposes, marks for OpenType features, then
recomposes!  How can that be of any use?

Also, is the preferred way fonts do Hangul as decomposed or composed?  I
imagine decomposed.

Thanks,
behdad