[Pixman] pixman transform

[Thilo Cestonaro]

Hey!

I try to understand how weston's fbdev compositor trys to transform the 
screen.
As it uses pixman to do this, I come here to hopefully get some answers 
:).

Can someone briefly explain the following functions (what they tend to 
do and what the parameters mean):

pixman_transform_init_identity
pixman_transform_rotate
pixman_transform_translate
pixman_image_set_transform

That would be awesome!

Thanks!

regards
Thilo