90 Degree rotation algorithm #845
Merlin1846
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The current built-in rotation algorithms are good general-purpose ones; However, if the rotation needed is a multiple of 90 then these algorithms introduce artifacts into the image when a 90-degree (or multiple) rotation should result in a perfect rotation. As such I'm proposing a simple multiple of 90 degrees only rotation algorithm which rotates the image, with no fancy interpolation or anything needed due to the angle limitations.
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