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

[Dohyun Kim]

2013/4/18 Behdad Esfahbod <behdad at behdad.org>:
> When are the OpenType features applied, after all those processes are done?

If possible, please apply "ccmp" feature before all those processes.
And "*jmo" features after all those processes.

> Are the '*jmo' features applied to all glyphs?

No. Only to those well-formed syllable block <M? L V T?>.

>
> 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/



--
Dohyun Kim
College of Law, Dongguk University
Seoul, Republic of Korea