[Indic-computing-devel] Fwd: Re: [I18n]Event generations..

[Ajay G. <aja...@ya...>]

Here's an email I thought might intrest you guys.

--- Owen Taylor <ot...@re...> wrote:
> To: i1...@XF...
> Subject: Re: [I18n]Event generations..
> From: Owen Taylor <ot...@re...>
> Date: Mon, 17 Jun 2002 15:00:11 -0400 (EDT)
> 
> 
> Ajay Guleria <aja...@ya...> writes:
> 
> > Brian/Owen,
> > 
> > I think the point Viveka Nathan was trying to make was that Indian
> languages
> > e.g. Hindi comprise of vowels (12) and consonants (~31) only. In the text
> > however, shapes of consonants are modified depending on the occurences of
> > vowels unlike English or European languages. 
> > 
> > Is there a possibility within X that the job of generating the complex
> > consonant shapes is passed to some kind of font rendering engine that
> > dynamically generates the character (or ligature) shape based on the
> keystroke
> > sequence? 
> > (Aplogize for my limited X knowledge, but pointers to any documentation
> that
> > can help my understanding would be appreciated.)
> 
> The basic architecture is:
> 
>    keystrokes => [input method] => Text => [layout engine] => Display
> 
> The complex handling of Hindi occurs at the layout engine level, not
> at the input method level.
> 
> (A simple input method that prohibits invalid input or reorders it into
> a valid order may be useful, however.)
> 
> Xlib contains only a very simple "layout engine" capability, which is
> not sufficient for handling Hindi.
> 
> There are various layout engines built on top of Xlib; a few examples:
> 
>  - Motif CTL (complex text layout)
>  - Pango (http://www.pango.org)
>  - Rendering code of the Qt toolkit.
> 
> Pango is the one I'm most familiar with, and it handles various Indic
> languages including Hindi.
> 
> Regards,
>                                         Owen
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