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Re: [pygame] blitting from-to surface with per-pixel alpha doesn't work...

D. Gyimesi wrote: 
The tank have turrets that are need to be rotated around its pivots
(when you move the mouse), and the whole tank should be rotatable around
its own pivot (when you press WASD). For example when you move the tank
and you want to turn to any directions.

Have you thought about using a limited number of pre-drawn frames showing the tank parts facing different directions? You'd have to calculate that a tank facing E with its turret 90 degrees to the right should use the "turret facing S" frame, but that'd save you the "expensive" rotation of images each frame.

Kris