pub type BlobFifo = Option<unsafe extern "C" fn(arg1: *const Image, arg2: *const c_void, arg3: usize) -> *mut c_int>;
pub enum BlobFifo { None, Some(unsafe extern "C" fn(*const _Image, *const c_void, usize) -> *mut i32), }
No value.
Some value of type T.
T