Function attr_to_liq_attr_ptr

imagequant-sys/src/ffi.rs:193–199

(ptr: &Attributes)

#[allow(clippy::cast_ptr_alignment)]
unsafe fn attr_to_liq_attr_ptr(ptr: &Attributes) -> &liq_attr {
    let liq_attr = std::ptr::NonNull::<liq_attr>::dangling();
    let outer_addr = std::ptr::addr_of!(*liq_attr.as_ptr()) as isize;
    let inner_addr = std::ptr::addr_of!((*liq_attr.as_ptr()).inner) as isize;

    &*(ptr as *const Attributes).cast::<u8>().offset(outer_addr - inner_addr).cast::<liq_attr>()
}

#[no_mangle]
#[inline(never)]