Two issues though:
From my understanding, it's not a transpose filter, but a rotation one, fixed to 90 degree angles. Unless I'm missing something in the code, it's not doing any actual flipping, like vf_transpose does. It should also be calling nppiTranspose_8u_C1R somewhere after/before the call to nppiRotate_8u_C1R. Or use a transformation matrix to do the transposition in one step, assuming libnpp has a function for that.
It's possible that I missed it doing the transpose somewhere, so please correct me if I'm wrong.
I'd also strongly prefer this filter to be compatible with the arguments of normal vf_transpose, and behave the same for the same arguments. Additional parameters with more functions are fine.
Timo
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