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Fast Warping Routines in IDL?

Does anyone know of any public fast generic warping routines written in IDL?
In particular, I'm interested in a REMAP routine that takes arrays of x and
y shifts for an image and maps the old image pixels to the new ones.  I
wrote one with FOR loops, but it's slow.  I'm hoping someone else has
already done something clever for this in IDL.

Myron Brown
JHU Applied Physics Laboratory