[HarfBuzz] New Indic standard?

Behdad Esfahbod behdad at behdad.org
Thu Aug 20 09:12:48 PDT 2009

On 08/20/2009 12:32 AM, Shriramana Sharma wrote:
> On 2009-Aug-19 22:40, Behdad Esfahbod wrote:
>> There's not much coding involved. It would be most efficient if the local
>> people focus on gathering the Indic data, and those of us who know the
>> code,
>> can focus on the coding part.
> Can you state precisely what "Indic data" is required?

Basically what you list yourself.  Something in a simple XML or other 
machine-readable format so we can process it.

Something as simple as:

INPUT: U+1234,U+5678 # some comment
FONT: Some Font Name 24
OUTPUT: <1,0,0>,<5,10,30>

Where the output tuples are glyph id, X and Y.
Something like that can be processed into whatever format we end up adopting 


> I presume basic
> support for the correct positioning of vowel matra-s already exists --
> there are reordrant matra-s and there are enclosing ones. I don't know
> whether support for consonant ligatures is to be provided by the
> renderer or is it totally taken care of by the font maker in OpenType
> programming? Off hand, the following is the list of aspects to be
> catered to while rendering Indic scripts with examples:
> 1. vowel matra-s:
> a. following - AA, II in Deva
> b. preceding - I in Deva
> c. enclosing - O, OO, AU in Tamil and Malayalam
> d. ligating - I and II in Tamil and Malayalam, many in Kannada and
> Telugu, RA + U/UU in Deva
> 2. ligatures
> 3. conjoining forms of types C1 and C2 (see
> http://unicode.org/review/pr-37.pdf as said before)
> 4. ligatures of consonants with virama (eyelash RA of Marathi, khanda ta
> of Bengali, NA of Telugu)
> 5. etc
> An exhaustive list must be created.
> Is there a wiki where we can contribute and collect detailed information
> on how the Indic scripts are to be laid out? (past participle of
> "layout" is "layouted"??) Can the IndLinux wiki be used for this purpose?
> Shriramana Sharma.

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