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use core::ffi::c_void;
use core::ptr;

use cty::c_ulong;

/// Raw window handle for Xlib.
///
/// ## Construction
/// ```
/// # use raw_window_handle::XlibHandle;
/// let handle = XlibHandle::empty();
/// /* set fields */
/// ```
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct XlibHandle {
    /// An Xlib `Window`.
    pub window: c_ulong,
    /// A pointer to an Xlib `Display`.
    pub display: *mut c_void,
}

/// Raw window handle for Xcb.
///
/// ## Construction
/// ```
/// # use raw_window_handle::XcbHandle;
/// let handle = XcbHandle::empty();
/// /* set fields */
/// ```
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct XcbHandle {
    /// An X11 `xcb_window_t`.
    pub window: u32, // Based on xproto.h
    /// A pointer to an X server `xcb_connection_t`.
    pub connection: *mut c_void,
}

/// Raw window handle for Wayland.
///
/// ## Construction
/// ```
/// # use raw_window_handle::WaylandHandle;
/// let handle = WaylandHandle::empty();
/// /* set fields */
/// ```
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct WaylandHandle {
    /// A pointer to a `wl_surface`.
    pub surface: *mut c_void,
    /// A pointer to a `wl_display`.
    pub display: *mut c_void,
}

impl XlibHandle {
    pub fn empty() -> Self {
        Self {
            window: 0,
            display: ptr::null_mut(),
        }
    }
}

impl XcbHandle {
    pub fn empty() -> Self {
        Self {
            window: 0,
            connection: ptr::null_mut(),
        }
    }
}

impl WaylandHandle {
    pub fn empty() -> Self {
        Self {
            surface: ptr::null_mut(),
            display: ptr::null_mut(),
        }
    }
}