Hi again, > Are there rules that rendering has to be per-pixel consistent, with > what should I compare to see wether my implementation works correct? Sorry about the traffic ... it seems different rounding errors were the cause for the different results, the rotated text was drawn to the BI at the position 0/20, whereas it was rendered at 100/100 to screen.
With adjusted positions I get consistent rendering with rotation also. Sorry for the traffic :-/ Thanks, Clemens