[HarfBuzz] Documenting OpenType shaping

[Nathan Willis]

On Tue, Jun 5, 2018 at 12:58 PM, Behdad Esfahbod <behdad.esfahbod at gmail.com>
wrote:

> Hey,
>
> Something I quickly spotted:
>
> """
> "Ra,Halant" sequences that occur elsewhere in the syllable may take on a
> below-base form (called "Rakaar" in Devanagari and most other scripts, and
> called "Raphala" in Bengali).
> """
>
> That should be Halant,Ra.
>
>
Gah. I thought I had caught all those. Fixed now; thanks!

Nate

On Tue, Jun 5, 2018, 7:43 AM Nathan Willis <nwillis at glyphography.com> wrote:
>
>> Hi everyone,
>>
>> I've been working on a set of specification-like documents that describe
>> how OpenType Layout works, specifically for shaping complex scripts. It's
>> not quite complete yet, but we'd appreciate any and all feedback that the
>> community can provide.
>>
>> The repository is here: https://github.com/n8willis/
>> opentype-shaping-documents/
>>
>> As the resident README says, the starting points that we'd currently
>> suggest people look at are
>>
>> - The Indic scripts, which you can get to from here:
>> https://github.com/n8willis/opentype-shaping-documents/
>> blob/master/opentype-shaping-indic-general.md
>> - The Arabic-and-related scripts (N'Ko, Syriac, Mongolian):
>> https://github.com/n8willis/opentype-shaping-documents/
>> blob/master/opentype-shaping-arabic-general.md
>> - Hangul: https://github.com/n8willis/opentype-shaping-documents/
>> blob/master/opentype-shaping-hangul.md
>>
>> A couple of the others are more-or-less complete, although I'm waiting on
>> some question-loops to close with people I've privately been bugging with
>> my questions. That includes Myanmar and Tibetan.
>>
>> I would definitely stay away from the Thai/Lao doc, which is in major
>> churn, and Hebrew, which hopefully lands shortly.
>>
>>
>> In any case, the goal here is to bridge the gap left by Microsoft's
>> "Developing OpenType fonts for Script X" pages, which only offer some
>> details aimed at font designers, and the OpenType/Unicode specs.
>>
>> It's targeting developers who have to implement script shaping. It's
>> based primarily on the HarfBuzz codebase, plus whatever is known about
>> Uniscribe, plus dissecting a lot of fonts. If there's anything that is
>> wrong, or is unclear, or is missing, please open an issue or a PR or just
>> tell me!
>>
>> That goes for the illustrations as well as the text; sometimes it can be
>> tough to tease out an illustration that highlights one specific GSUB
>> feature, when in reality they are meant to work together.
>>
>> Your feedback and help is appreciated!
>>
>> Nate
>>
>> --
>> nathan.p.willis
>> nwillis at glyphography.com <http://identi.ca/n8>
>> _______________________________________________
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>> HarfBuzz at lists.freedesktop.org
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>>
>


-- 
nathan.p.willis
325.480.4729
nwillis at glyphography.com <http://identi.ca/n8>
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