Function CGRegisterScreenRefreshCallback 

pub unsafe extern "C-unwind" fn CGRegisterScreenRefreshCallback(
    callback: CGScreenRefreshCallback,
    user_info: *mut c_void,
) -> CGError

👎Deprecated: No longer supported

Available on crate features CGError and CGRemoteOperation only.

Safety

• callback must be implemented correctly.
• user_info must be a valid pointer or null.