swsurface 0.1.4

Software-rendered surface for winit
Documentation 
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// Based on <https://github.com/rust-windowing/winit/blob/master/src/platform/macos/window.rs>
use cocoa::{
    base::{id, nil},
    foundation::NSAutoreleasePool,
};
use objc::{msg_send, sel, sel_impl};
use std::ops::Deref;

#[derive(Debug)]
pub struct IdRef(id);

impl IdRef {
    pub fn new(i: id) -> IdRef {
        IdRef(i)
    }

    #[allow(dead_code)]
    pub fn retain(i: id) -> IdRef {
        if i != nil {
            let _: id = unsafe { msg_send![i, retain] };
        }
        IdRef(i)
    }

    pub fn non_nil(self) -> Option<IdRef> {
        if self.0 == nil {
            None
        } else {
            Some(self)
        }
    }
}

impl Drop for IdRef {
    fn drop(&mut self) {
        if self.0 != nil {
            with_autorelease_pool(|| unsafe {
                let _: () = msg_send![self.0, release];
            });
        }
    }
}

impl Deref for IdRef {
    type Target = id;
    fn deref<'a>(&'a self) -> &'a id {
        &self.0
    }
}

impl Clone for IdRef {
    fn clone(&self) -> IdRef {
        if self.0 != nil {
            let _: id = unsafe { msg_send![self.0, retain] };
        }
        IdRef(self.0)
    }
}

#[derive(Debug)]
pub struct AutoreleasePool(id);

impl AutoreleasePool {
    pub fn new() -> Self {
        Self(unsafe { NSAutoreleasePool::new(nil) })
    }
}

impl Drop for AutoreleasePool {
    fn drop(&mut self) {
        let () = unsafe { msg_send![self.0, release] };
    }
}

pub fn with_autorelease_pool<T>(f: impl FnOnce() -> T) -> T {
    let _arp = AutoreleasePool::new();
    f()
}