Making the malayalam rendering proper

[ശ്യാ ം കാ രനാട ്ട് | shyam karanattu]

Hi,
I am using GNU Emacs 23.0.60.1 (i686-pc-linux-gnu, GTK+ Version 2.12.9) of 2008-05-07 .
In all unicode enabled gnu emacs that i tried, malayalam is rendered as a stream of unicode letters. Malayalam like other devanagari scripts, often requires to combine two characters(with two different glyphs) to display another glyph which represent the combination(complex script?) 
The picture attached,shows the difference in rendering of the same string in emacs and in gedit.The first one is made in emacs and the second bigger one in gedit.after developing some patches, Pango renders malayalam perfectly from version 1.20 onwards..
How could this be made right.Where can i find more information about the rendering details of emacs?
gpled fonts like the ones available from http://download.savannah.gnu.org/releases/smc/fonts/malayalam-fonts-04/ 
are having sufficient glyphs to render malayalam perfectly..But this bug requires some work regarding rendering right?

thank you
Shyam.K

emacs-rendering-difference.png
Description: PNG image