[HarfBuzz] Hangul Shaper (was Re: an issue regarding discrepancy between Korean and Unicode standards

[Behdad Esfahbod]

When are the OpenType features applied, after all those processes are done?
Are the '*jmo' features applied to all glyphs?

On 13-04-16 11:29 PM, Dohyun Kim wrote:
> http://ktug.org/~nomos/harfbuzz-hangul/hangulshaper.pdf
> 
> Regards,
> 
> 2013/4/17 Behdad Esfahbod <behdad at behdad.org>:
>> Ok, given how confusing this thread has become, please create a Google Doc,
>> and write down what you think the HarfBuzz Hangul shaper should do.  Modify it
>> as much as you want, but keep it as short as possible.  Please make the doc
>> commentable by the public, and send the link here.
>>
>> Thanks,
>> behdad
>>
>> On 13-04-16 10:10 AM, Dohyun Kim wrote:
>>> 2013/4/16 Dohyun Kim <nomosnomos at gmail.com>:
>>>> 2013/4/15 Dohyun Kim <nomosnomos at gmail.com>:
>>>>>
>>>>> The behavior of new Uniscribe is quote confusing and seems to be
>>>>> inconsistant on some points.  I cannot describe concisely what it
>>>>> does.  But it is evident that it renders correctly only those input
>>>>> sequence which is compliant to KS X 1026-1.
>>>>>
>>>>
>>>> OK.  My guess about the behavior of new Uniscribe:
>>>>
>>>> 1.  demarcate syllable blocks according to KS X 1026-1
>>>>
>>>>    - between L and L, V and V, T and T, or L and T (these are illegal string)
>>>>    - between V and L, T and L, or M and L (these are legal break point)
>>>>    - between Jamo and non-Jamo character including Hangul syllables
>>>>    - but not between L and V, V and T, T and M, V and M, LVT and M, LV and M.
>>>
>>> Oh, I have left out one stunning thing.  I really dislike this sort of behavior:
>>>
>>>    - The Jamo sequence of <L V T> is divided into <L | V | T>, if
>>> equivalent <LVT> syllable exists.
>>>    - Likewise, <L V> sequence is divided into <L | V>, if it is not
>>> followed by T and equivalent <LV> syllable exists.
>>>
>>>>
>>>> where LVT and LV are Hangul syllables; L, V, and T are Jamos; M means
>>>> Hangul tone marks (U+302E or U+302F)
>>>>
>>>> 2.  reorder Hangul tone marks
>>>>
>>>>     - if syllable block is well-formed, move M from the last to the
>>>> first of the cluster.
>>>>     - if syllable is not well-formed, Uniscribe does not move M.
>>>> Instead, U+25CC is inserted after M.
>>>>
>>>> where "well-formed" means <LVT>, <LV>, <L V T>, or <L V>.
>>>>
>>>
>>> --
>>> Dohyun Kim
>>> College of Law, Dongguk University
>>> Seoul, Republic of Korea
>>>
>>
>> --
>> behdad
>> http://behdad.org/
> 
> 
> 

-- 
behdad
http://behdad.org/