Subpixel averaging

[Chong Yidong]

Although Emacs now performs anti-aliasing, it doesn't seem to perform
subpixel averaging.  I, for one, find the anti-aliased text in Emacs
blurry and very uncomfortable to read, especially when using
bright-on-dark color schemes.  As a result, I'm forced to use the old
fonts.

The attached screenshot shows the difference between gedit (top) and
Emacs 23 (bottom).

emacs-aa.png
Description: PNG image

I don't know how easy it is to add subpixel averaging.  Could someone
who has been working on this part of the code enlighten me?  Even if you
are too busy to work on this yourself, I'd appreciate it if you could
point me to the right starting place for adding this feature.