Quickest Drawing Method

FROM : spiderlama
DATE : Sun Jul 22 08:25:42 2007

I'm writing an app which will constantly write an image to the 
screen. I would like to know the quickest way to draw an image to the 
screen (the image needs to be composed first).

Currently I have a borderless window the size of the screen with 
clear background, and I set the window background to an image.

I would like it to be an animation, like the Dock resizing; how is 
the Dock drawn without a window, and how can I accomplish this?

Cheers
Matt