clipCopyRectangles
fun clipCopyRectangles(sourceRectangle: IntRectangle, targetRectangle: IntRectangle, sourceLevel: IntRectangle, targetLevel: IntRectangle): Pair<IntRectangle, IntRectangle>?(source)
Clips the rectangles of an unscaled copy to the levels of the source and target
Return
the clipped source and target rectangles, or null when nothing is left to copy