opencv/cxcore.go
func (mat *Mat) SetData(data unsafe.Pointer, step int) {
	C.cvSetData(unsafe.Pointer(mat), data, C.int(step))
}
func (mat *Mat) SetData(data unsafe.Pointer, step int) {
	C.cvSetData(unsafe.Pointer(mat), data, C.int(step))
}
/* SetData assigns user data to the matrix header. */