Consider the PlgBlt API function, I have used it to rotate images but it is only implemented on some versions of windows (viz., those derived from NT).
Cheers.
"Life is full of learning, and then there is wisdom"
PlGBlit is a little limiting, frankly. You might want to investigate the idea of SetWorldTransform.
However, the goal that the actual quality won't be impacted is, I'm afraid, more-or-less unachievable. But, since you are dealing with jpegs (and therefore - probably - photos) this shouldn't be too much of a problem, as the apparant quality should hardly be impacted by SetWorldTransform
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