Doubt regarding Indic fonts rendering

[bheemesh <bheemesh prodigylabs com>]

Hello Owen,

I have installed gtk+-directfb.2.0.9, and DirectFb-0.9.20 along with 
pango-1.2.5 with fontconfig an freetype.

The installation went on fine & example codes are working fine.
But only for english fonts & it's related fonts. But actually i want to run 
"indic fonts" on my Gtk+ appln. I have installed all the necessary "locales" 
and "fonts" for Indic languages.

But now if run simplest of "calender" example of Gtk+ also, indic fonts are 
not visible.
In fact i tried to set LANG variable to "hi_IN" ( locale for hindi Indic 
font). Then when i execute the calender , directly the hindi fonts apear.

But i want to know how to change fonts across indic fonts, at runtime, not by 
making use of LANG variable.
 Is LANG variable is the only way of changing locale, that is used by Pango, 
or Pango does change locale & fonts by any other mechanism.

If Pango uses other mechanism where exactly it searches for locales & fonts 
as we have folders by name "locale " and "fonts" at various locations like 
"/etc", "usr/share" etc etc.

Pls suggest me a good link or tutorial which describes how pango is able to 
switch across fonts & locales at runtime to run gtk applns with multilingual 
support.

I expect a favorable reply at the earliest.

Thank you very much in advance,

regards,
Bheemesh.