Heinous hackery to transmit zero-copy events in Rust.

heinous.rs

	#[inline]
	unsafe fn with_window_event_db(_in: &CommonEventInfo, block: |&mut DelegateBoard|) {
		let event : &MouseMotionEventInfo = cast::transmute(_in);
		EventPump::with_window_db(event.window_id(), block)
	}

	unsafe fn with_window_db(id: u32, block: |&mut DelegateBoard|) {
		let win = ffi::SDL_GetWindowFromID(id);
		if win.is_not_null() {
			let dbp = ffi::SDL_GetWindowData(win, bytes!("rust_cb", 0).as_ptr() as *i8);
			if dbp.is_not_null() {
				let db : &mut DelegateBoard = cast::transmute(dbp);
				block(db)
			}
		}
	}

	pub fn do_all(&mut self) {
		unsafe {
			while (ffi::SDL_PollEvent(&mut self.data as *mut EventInfo) == 1) {
				let event : &CommonEventInfo = cast::transmute(&self.data);
				match event.etype {
					event::MouseMotion => EventPump::with_window_event_db(event, |db| {
						db.mouse.borrow().with_mut(|this| {
							this.mouse_did_move(cast::transmute(event))
						})
					}),
					event::MouseButtonDown => {},
					event::MouseButtonUp => {},
					event::MouseWheel => {},
					_ => {}
				}
			}
		}
	}