[comp.graphics] Algorithms to Rotate a 2-D raster image?

markc@hpcvlx.cv.hp.com (Mark Cook) (12/06/89)

I'm expanding the capabilities of an X Windows-based raster graphics
editor and I'm having some trouble finding an algorithm which will
allow me to apply an arbitrary amount of rotation to a rectangular
raster image.  I have an abbreviated copy of the Catmull-Smith 2-pass
transform, but am having trouble translating it into the appropriate
Xlib transforms.

If anyone has examples of other raster rotation schemes which I could
convert to Xlib, I'd greatly appreciate seeing how else it can be done.

Thanks in advance,

	Mark F. Cook

USMail: User Interface Technical Support
	Hewlett-Packard - Corvallis Information Systems
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