Function CGAffineTransformDecompose 

pub extern "C-unwind" fn CGAffineTransformDecompose(
    transform: CGAffineTransform,
) -> CGAffineTransformComponents

Available on crate feature CGAffineTransform only.

Decompose a CGAffineTransform into a scale * shear * rotation * translation

This decomposition method may be used to provide insight into what a arbitrary CGAffineTransform does. This may be necessary, for example, because an algorithm would like to know what the scaling portion of a transform is before rotation, or perhaps because some part of a transform is undesired and your application would like to replace a portion of it with a different transformation.

Since there are many ways to make a affine transform out of other affine transforms this method can not tell us the ordering of geometric steps used to create the original CGAffineTransform. It tells us what the transform does, not how it was made.

Parameter transform: The CGAffineTransform to decompose

Returns: A decomposed set of geometric operations, the product of which is the CGAffineTransform.