Hello,

thank you for your answer. I did it yesterday as you said and it works fine. There seems to be even no loss of speed doing this.
But now another question.
I have a Bitmap sized bigger than 256*256 which I want to rotate...
If I build it out of 4 tiles, how to rotate then? I think I can only rotate one image at a time, and the position of the other parts have to be exactly correct not to get black lines in the rotation. I am no mathematics expert, so a little hint or maybe a little piece of code could help me very much with this.

I think if I can manage this I have all I need to proceed with PowerDraw/Asphyre. That would be great, because even on a machine with GeForce2MX onboard I achieve about 100 FPS in windowed mode... thats great...