Zakero_Yetani.h

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/******************************************************************************
 * Copyright 2020 Andrew Moore
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */
 
#ifndef zakero_Yetani_h
#define zakero_Yetani_h
 
/******************************************************************************
 * Includes
 */
 
#include <iostream>
#include <thread>
 
// POSIX
#include <poll.h>
 
// Linux
#include <linux/input-event-codes.h>
 
// Wayland
#include <wayland/wayland-client.h>
 
// Zakero
#include "Zakero_Base.h"
#include "Zakero_MemoryPool.h"
 
 
/******************************************************************************
 * Macros
 */
 
// {{{ Macros
 
#define ZAKERO_YETANI__ERROR_DATA \
        X(Error_None                                   ,  0 , "No Error"                                                         ) \
        X(Error_Compositor_Was_Not_Found               ,  1 , "Could not find the Compositor object in the Global Repository."   ) \
        X(Error_Connection_Failed                      ,  2 , "Failed to connect to the Wayland Server."                         ) \
        X(Error_Cursor_Already_Exists                  ,  3 , "A cursor with that name already exists."                          ) \
        X(Error_Cursor_Does_Not_Exist                  ,  4 , "No cursors exists with that name."                                ) \
        X(Error_Cursor_Frame_Time_Too_Large            ,  5 , "The cursor time per frame is too large, must be <= Size_Max."     ) \
        X(Error_Cursor_Frame_Time_Too_Small            ,  6 , "The cursor time per frame is too small, must be greater than 0."  ) \
        X(Error_Cursor_Image_Data_Is_Empty             ,  7 , "The cursor image data can not be empty."                          ) \
        X(Error_Cursor_Name_Is_Invalid                 ,  8 , "The cursor name is invalid."                                      ) \
        X(Error_Cursor_Not_Attached                    ,  9 , "The specified cursor is not attached/in-use."                     ) \
        X(Error_Cursor_Size_Too_Small                  , 10 , "The cursor size, both width and height must be greater than 0."   ) \
        X(Error_Invalid_Display_Name                   , 11 , "An invalid dispaly name was given to the Wayland Server."         ) \
        X(Error_Minimum_Size_Greater_Than_Maximum_Size , 12 , "The minimum window size is larger than the maximum window size."  ) \
        X(Error_No_Output_Available                    , 13 , "No output devices are available."                                 ) \
        X(Error_Registry_Not_Available                 , 14 , "Unable to get the registery."                                     ) \
        X(Error_Server_Side_Decorations_Not_Available  , 15 , "The Wayland Compositor does not support Server Side Decorations." ) \
        X(Error_Shm_Was_Not_Found                      , 16 , "Could not find the Shm object in the Global Repository."          ) \
        X(Error_Wayland_Not_Available                  , 17 , "Could not find the Wayland Server."                               ) \
        X(Error_Window_Initialization_Failed           , 18 , "The window was not able to be initialized."                       ) \
        X(Error_Window_Size_Too_Small                  , 19 , "The window size was too small."                                   ) \
        X(Error_Xdg_WM_Base_Was_Not_Found              , 20 , "Could not find the XDG WM Base object the Global Repository."     ) \
 
        /* --- To Be Deleted --- */
        /*
        X(Error_Window_Already_Exists                  , 100 , "A window with that name already exists."                          ) \
        X(Error_Window_Does_Not_Exist                  , 101 , "No windows exists with that name."                                ) \
        X(Error_Window_Name_Can_Not_Be_Empty           , 102 , "Windows can not have empty names."                                ) \
        X(Error_EventLoop_Is_Already_Running           , 103 , "Can't start the event loop since it is already running."          ) \
        X(Error_Connection_Not_Initialized             , 104 , "Not connected to the Wayland Server."                             ) \
        X(Error_Connection_Already_Established         , 105 , "Must disconnect before establishing a new connection."            ) \
        X(Error_Seat_Was_Not_Found                     , 106 , "Could not find the Seat object in the Global Repository."         ) \
        X(Error_Present_Current_Image_First            , 107 , "The next image has already been retrieved and must be presented." ) \
        X(Error_No_Image_Is_Available                  , 108 , "No image is available to be retrieved."                           ) \
        X(Error_Window_Is_Locked                       , 109 , "The window access is restricted due to being locked."             ) \
        X(Error_Cursor_Image_Data_Size_Is_Invalid      , 110 , "The cursor image data size does not match the configuration."     ) \
        */
 
// }}}
 
/******************************************************************************
 * Generated Code
 *
 * The code is this section was created by "wayland-protocol/protocol.sh".  The 
 * generated code is required since the XDG/Wayland headers are not officially 
 * distributed.  Plus, there are many versions of the generated code with 
 * slight variations.  By including the code directly, the generated code is 
 * from a known baseline.
 *
 * TL;DR: The code you are looking for is in the Yetani class.
 */
 
/*
 * The "wayland-protocol/protocol.sh" script uses this fold as markers to know 
 * where to add and remove code.
 */
// {{{ Generated Code
// {{{ xdg-decoration-unstable-v1
struct xdg_toplevel;
struct zxdg_decoration_manager_v1;
struct zxdg_toplevel_decoration_v1;
extern const struct wl_interface zxdg_decoration_manager_v1_interface;
extern const struct wl_interface zxdg_toplevel_decoration_v1_interface;
static inline void
zxdg_decoration_manager_v1_set_user_data(struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1, void *user_data)
{
 wl_proxy_set_user_data((struct wl_proxy *) zxdg_decoration_manager_v1, user_data);
}
static inline void *
zxdg_decoration_manager_v1_get_user_data(struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1)
{
 return wl_proxy_get_user_data((struct wl_proxy *) zxdg_decoration_manager_v1);
}
static inline uint32_t
zxdg_decoration_manager_v1_get_version(struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1)
{
 return wl_proxy_get_version((struct wl_proxy *) zxdg_decoration_manager_v1);
}
static inline void
zxdg_decoration_manager_v1_destroy(struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1)
{
 wl_proxy_marshal((struct wl_proxy *) zxdg_decoration_manager_v1,
    0);
 wl_proxy_destroy((struct wl_proxy *) zxdg_decoration_manager_v1);
}
static inline struct zxdg_toplevel_decoration_v1 *
zxdg_decoration_manager_v1_get_toplevel_decoration(struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1, struct xdg_toplevel *toplevel)
{
 struct wl_proxy *id;
 id = wl_proxy_marshal_constructor((struct wl_proxy *) zxdg_decoration_manager_v1,
    1, &zxdg_toplevel_decoration_v1_interface, NULL, toplevel);
 return (struct zxdg_toplevel_decoration_v1 *) id;
}
enum zxdg_toplevel_decoration_v1_error {
 ZXDG_TOPLEVEL_DECORATION_V1_ERROR_UNCONFIGURED_BUFFER = 0,
 ZXDG_TOPLEVEL_DECORATION_V1_ERROR_ALREADY_CONSTRUCTED = 1,
 ZXDG_TOPLEVEL_DECORATION_V1_ERROR_ORPHANED = 2,
};
enum zxdg_toplevel_decoration_v1_mode {
 ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE = 1,
 ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE = 2,
};
struct zxdg_toplevel_decoration_v1_listener {
 void (*configure)(void *data,
     struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1,
     uint32_t mode);
};
static inline int
zxdg_toplevel_decoration_v1_add_listener(struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1,
      const struct zxdg_toplevel_decoration_v1_listener *listener, void *data)
{
 return wl_proxy_add_listener((struct wl_proxy *) zxdg_toplevel_decoration_v1,
         (void (**)(void)) listener, data);
}
static inline void
zxdg_toplevel_decoration_v1_set_user_data(struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1, void *user_data)
{
 wl_proxy_set_user_data((struct wl_proxy *) zxdg_toplevel_decoration_v1, user_data);
}
static inline void *
zxdg_toplevel_decoration_v1_get_user_data(struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1)
{
 return wl_proxy_get_user_data((struct wl_proxy *) zxdg_toplevel_decoration_v1);
}
static inline uint32_t
zxdg_toplevel_decoration_v1_get_version(struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1)
{
 return wl_proxy_get_version((struct wl_proxy *) zxdg_toplevel_decoration_v1);
}
static inline void
zxdg_toplevel_decoration_v1_destroy(struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1)
{
 wl_proxy_marshal((struct wl_proxy *) zxdg_toplevel_decoration_v1,
    0);
 wl_proxy_destroy((struct wl_proxy *) zxdg_toplevel_decoration_v1);
}
static inline void
zxdg_toplevel_decoration_v1_set_mode(struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1, uint32_t mode)
{
 wl_proxy_marshal((struct wl_proxy *) zxdg_toplevel_decoration_v1,
    1, mode);
}
static inline void
zxdg_toplevel_decoration_v1_unset_mode(struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1)
{
 wl_proxy_marshal((struct wl_proxy *) zxdg_toplevel_decoration_v1,
    2);
}
#ifdef ZAKERO_YETANI_IMPLEMENTATION
extern const struct wl_interface xdg_toplevel_interface;
extern const struct wl_interface zxdg_toplevel_decoration_v1_interface;
static const struct wl_interface *xdg_decoration_unstable_v1_types[] = {
 NULL,
 &zxdg_toplevel_decoration_v1_interface,
 &xdg_toplevel_interface,
};
static const struct wl_message zxdg_decoration_manager_v1_requests[] = {
 { "destroy", "", xdg_decoration_unstable_v1_types + 0 },
 { "get_toplevel_decoration", "no", xdg_decoration_unstable_v1_types + 1 },
};
const struct wl_interface zxdg_decoration_manager_v1_interface = {
 "zxdg_decoration_manager_v1", 1,
 2, zxdg_decoration_manager_v1_requests,
 0, NULL,
};
static const struct wl_message zxdg_toplevel_decoration_v1_requests[] = {
 { "destroy", "", xdg_decoration_unstable_v1_types + 0 },
 { "set_mode", "u", xdg_decoration_unstable_v1_types + 0 },
 { "unset_mode", "", xdg_decoration_unstable_v1_types + 0 },
};
static const struct wl_message zxdg_toplevel_decoration_v1_events[] = {
 { "configure", "u", xdg_decoration_unstable_v1_types + 0 },
};
const struct wl_interface zxdg_toplevel_decoration_v1_interface = {
 "zxdg_toplevel_decoration_v1", 1,
 3, zxdg_toplevel_decoration_v1_requests,
 1, zxdg_toplevel_decoration_v1_events,
};
#endif // ZAKERO_YETANI_IMPLEMENTATION
// }}}
// {{{ xdg-shell
struct wl_output;
struct wl_seat;
struct wl_surface;
struct xdg_popup;
struct xdg_positioner;
struct xdg_surface;
struct xdg_toplevel;
struct xdg_wm_base;
extern const struct wl_interface xdg_wm_base_interface;
extern const struct wl_interface xdg_positioner_interface;
extern const struct wl_interface xdg_surface_interface;
extern const struct wl_interface xdg_toplevel_interface;
extern const struct wl_interface xdg_popup_interface;
enum xdg_wm_base_error {
 XDG_WM_BASE_ERROR_ROLE = 0,
 XDG_WM_BASE_ERROR_DEFUNCT_SURFACES = 1,
 XDG_WM_BASE_ERROR_NOT_THE_TOPMOST_POPUP = 2,
 XDG_WM_BASE_ERROR_INVALID_POPUP_PARENT = 3,
 XDG_WM_BASE_ERROR_INVALID_SURFACE_STATE = 4,
 XDG_WM_BASE_ERROR_INVALID_POSITIONER = 5,
};
struct xdg_wm_base_listener {
 void (*ping)(void *data,
       struct xdg_wm_base *xdg_wm_base,
       uint32_t serial);
};
static inline int
xdg_wm_base_add_listener(struct xdg_wm_base *xdg_wm_base,
    const struct xdg_wm_base_listener *listener, void *data)
{
 return wl_proxy_add_listener((struct wl_proxy *) xdg_wm_base,
         (void (**)(void)) listener, data);
}
static inline void
xdg_wm_base_set_user_data(struct xdg_wm_base *xdg_wm_base, void *user_data)
{
 wl_proxy_set_user_data((struct wl_proxy *) xdg_wm_base, user_data);
}
static inline void *
xdg_wm_base_get_user_data(struct xdg_wm_base *xdg_wm_base)
{
 return wl_proxy_get_user_data((struct wl_proxy *) xdg_wm_base);
}
static inline uint32_t
xdg_wm_base_get_version(struct xdg_wm_base *xdg_wm_base)
{
 return wl_proxy_get_version((struct wl_proxy *) xdg_wm_base);
}
static inline void
xdg_wm_base_destroy(struct xdg_wm_base *xdg_wm_base)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_wm_base,
    0);
 wl_proxy_destroy((struct wl_proxy *) xdg_wm_base);
}
static inline struct xdg_positioner *
xdg_wm_base_create_positioner(struct xdg_wm_base *xdg_wm_base)
{
 struct wl_proxy *id;
 id = wl_proxy_marshal_constructor((struct wl_proxy *) xdg_wm_base,
    1, &xdg_positioner_interface, NULL);
 return (struct xdg_positioner *) id;
}
static inline struct xdg_surface *
xdg_wm_base_get_xdg_surface(struct xdg_wm_base *xdg_wm_base, struct wl_surface *surface)
{
 struct wl_proxy *id;
 id = wl_proxy_marshal_constructor((struct wl_proxy *) xdg_wm_base,
    2, &xdg_surface_interface, NULL, surface);
 return (struct xdg_surface *) id;
}
static inline void
xdg_wm_base_pong(struct xdg_wm_base *xdg_wm_base, uint32_t serial)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_wm_base,
    3, serial);
}
enum xdg_positioner_error {
 XDG_POSITIONER_ERROR_INVALID_INPUT = 0,
};
enum xdg_positioner_anchor {
 XDG_POSITIONER_ANCHOR_NONE = 0,
 XDG_POSITIONER_ANCHOR_TOP = 1,
 XDG_POSITIONER_ANCHOR_BOTTOM = 2,
 XDG_POSITIONER_ANCHOR_LEFT = 3,
 XDG_POSITIONER_ANCHOR_RIGHT = 4,
 XDG_POSITIONER_ANCHOR_TOP_LEFT = 5,
 XDG_POSITIONER_ANCHOR_BOTTOM_LEFT = 6,
 XDG_POSITIONER_ANCHOR_TOP_RIGHT = 7,
 XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT = 8,
};
enum xdg_positioner_gravity {
 XDG_POSITIONER_GRAVITY_NONE = 0,
 XDG_POSITIONER_GRAVITY_TOP = 1,
 XDG_POSITIONER_GRAVITY_BOTTOM = 2,
 XDG_POSITIONER_GRAVITY_LEFT = 3,
 XDG_POSITIONER_GRAVITY_RIGHT = 4,
 XDG_POSITIONER_GRAVITY_TOP_LEFT = 5,
 XDG_POSITIONER_GRAVITY_BOTTOM_LEFT = 6,
 XDG_POSITIONER_GRAVITY_TOP_RIGHT = 7,
 XDG_POSITIONER_GRAVITY_BOTTOM_RIGHT = 8,
};
enum xdg_positioner_constraint_adjustment {
 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_NONE = 0,
 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_X = 1,
 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_Y = 2,
 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_X = 4,
 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_Y = 8,
 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_X = 16,
 XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_Y = 32,
};
static inline void
xdg_positioner_set_user_data(struct xdg_positioner *xdg_positioner, void *user_data)
{
 wl_proxy_set_user_data((struct wl_proxy *) xdg_positioner, user_data);
}
static inline void *
xdg_positioner_get_user_data(struct xdg_positioner *xdg_positioner)
{
 return wl_proxy_get_user_data((struct wl_proxy *) xdg_positioner);
}
static inline uint32_t
xdg_positioner_get_version(struct xdg_positioner *xdg_positioner)
{
 return wl_proxy_get_version((struct wl_proxy *) xdg_positioner);
}
static inline void
xdg_positioner_destroy(struct xdg_positioner *xdg_positioner)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    0);
 wl_proxy_destroy((struct wl_proxy *) xdg_positioner);
}
static inline void
xdg_positioner_set_size(struct xdg_positioner *xdg_positioner, int32_t width, int32_t height)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    1, width, height);
}
static inline void
xdg_positioner_set_anchor_rect(struct xdg_positioner *xdg_positioner, int32_t x, int32_t y, int32_t width, int32_t height)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    2, x, y, width, height);
}
static inline void
xdg_positioner_set_anchor(struct xdg_positioner *xdg_positioner, uint32_t anchor)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    3, anchor);
}
static inline void
xdg_positioner_set_gravity(struct xdg_positioner *xdg_positioner, uint32_t gravity)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    4, gravity);
}
static inline void
xdg_positioner_set_constraint_adjustment(struct xdg_positioner *xdg_positioner, uint32_t constraint_adjustment)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    5, constraint_adjustment);
}
static inline void
xdg_positioner_set_offset(struct xdg_positioner *xdg_positioner, int32_t x, int32_t y)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    6, x, y);
}
static inline void
xdg_positioner_set_reactive(struct xdg_positioner *xdg_positioner)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    7);
}
static inline void
xdg_positioner_set_parent_size(struct xdg_positioner *xdg_positioner, int32_t parent_width, int32_t parent_height)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    8, parent_width, parent_height);
}
static inline void
xdg_positioner_set_parent_configure(struct xdg_positioner *xdg_positioner, uint32_t serial)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_positioner,
    9, serial);
}
enum xdg_surface_error {
 XDG_SURFACE_ERROR_NOT_CONSTRUCTED = 1,
 XDG_SURFACE_ERROR_ALREADY_CONSTRUCTED = 2,
 XDG_SURFACE_ERROR_UNCONFIGURED_BUFFER = 3,
};
struct xdg_surface_listener {
 void (*configure)(void *data,
     struct xdg_surface *xdg_surface,
     uint32_t serial);
};
static inline int
xdg_surface_add_listener(struct xdg_surface *xdg_surface,
    const struct xdg_surface_listener *listener, void *data)
{
 return wl_proxy_add_listener((struct wl_proxy *) xdg_surface,
         (void (**)(void)) listener, data);
}
static inline void
xdg_surface_set_user_data(struct xdg_surface *xdg_surface, void *user_data)
{
 wl_proxy_set_user_data((struct wl_proxy *) xdg_surface, user_data);
}
static inline void *
xdg_surface_get_user_data(struct xdg_surface *xdg_surface)
{
 return wl_proxy_get_user_data((struct wl_proxy *) xdg_surface);
}
static inline uint32_t
xdg_surface_get_version(struct xdg_surface *xdg_surface)
{
 return wl_proxy_get_version((struct wl_proxy *) xdg_surface);
}
static inline void
xdg_surface_destroy(struct xdg_surface *xdg_surface)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_surface,
    0);
 wl_proxy_destroy((struct wl_proxy *) xdg_surface);
}
static inline struct xdg_toplevel *
xdg_surface_get_toplevel(struct xdg_surface *xdg_surface)
{
 struct wl_proxy *id;
 id = wl_proxy_marshal_constructor((struct wl_proxy *) xdg_surface,
    1, &xdg_toplevel_interface, NULL);
 return (struct xdg_toplevel *) id;
}
static inline struct xdg_popup *
xdg_surface_get_popup(struct xdg_surface *xdg_surface, struct xdg_surface *parent, struct xdg_positioner *positioner)
{
 struct wl_proxy *id;
 id = wl_proxy_marshal_constructor((struct wl_proxy *) xdg_surface,
    2, &xdg_popup_interface, NULL, parent, positioner);
 return (struct xdg_popup *) id;
}
static inline void
xdg_surface_set_window_geometry(struct xdg_surface *xdg_surface, int32_t x, int32_t y, int32_t width, int32_t height)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_surface,
    3, x, y, width, height);
}
static inline void
xdg_surface_ack_configure(struct xdg_surface *xdg_surface, uint32_t serial)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_surface,
    4, serial);
}
enum xdg_toplevel_resize_edge {
 XDG_TOPLEVEL_RESIZE_EDGE_NONE = 0,
 XDG_TOPLEVEL_RESIZE_EDGE_TOP = 1,
 XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM = 2,
 XDG_TOPLEVEL_RESIZE_EDGE_LEFT = 4,
 XDG_TOPLEVEL_RESIZE_EDGE_TOP_LEFT = 5,
 XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_LEFT = 6,
 XDG_TOPLEVEL_RESIZE_EDGE_RIGHT = 8,
 XDG_TOPLEVEL_RESIZE_EDGE_TOP_RIGHT = 9,
 XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_RIGHT = 10,
};
enum xdg_toplevel_state {
 XDG_TOPLEVEL_STATE_MAXIMIZED = 1,
 XDG_TOPLEVEL_STATE_FULLSCREEN = 2,
 XDG_TOPLEVEL_STATE_RESIZING = 3,
 XDG_TOPLEVEL_STATE_ACTIVATED = 4,
 XDG_TOPLEVEL_STATE_TILED_LEFT = 5,
 XDG_TOPLEVEL_STATE_TILED_RIGHT = 6,
 XDG_TOPLEVEL_STATE_TILED_TOP = 7,
 XDG_TOPLEVEL_STATE_TILED_BOTTOM = 8,
};
struct xdg_toplevel_listener {
 void (*configure)(void *data,
     struct xdg_toplevel *xdg_toplevel,
     int32_t width,
     int32_t height,
     struct wl_array *states);
 void (*close)(void *data,
        struct xdg_toplevel *xdg_toplevel);
};
static inline int
xdg_toplevel_add_listener(struct xdg_toplevel *xdg_toplevel,
     const struct xdg_toplevel_listener *listener, void *data)
{
 return wl_proxy_add_listener((struct wl_proxy *) xdg_toplevel,
         (void (**)(void)) listener, data);
}
static inline void
xdg_toplevel_set_user_data(struct xdg_toplevel *xdg_toplevel, void *user_data)
{
 wl_proxy_set_user_data((struct wl_proxy *) xdg_toplevel, user_data);
}
static inline void *
xdg_toplevel_get_user_data(struct xdg_toplevel *xdg_toplevel)
{
 return wl_proxy_get_user_data((struct wl_proxy *) xdg_toplevel);
}
static inline uint32_t
xdg_toplevel_get_version(struct xdg_toplevel *xdg_toplevel)
{
 return wl_proxy_get_version((struct wl_proxy *) xdg_toplevel);
}
static inline void
xdg_toplevel_destroy(struct xdg_toplevel *xdg_toplevel)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    0);
 wl_proxy_destroy((struct wl_proxy *) xdg_toplevel);
}
static inline void
xdg_toplevel_set_parent(struct xdg_toplevel *xdg_toplevel, struct xdg_toplevel *parent)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    1, parent);
}
static inline void
xdg_toplevel_set_title(struct xdg_toplevel *xdg_toplevel, const char *title)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    2, title);
}
static inline void
xdg_toplevel_set_app_id(struct xdg_toplevel *xdg_toplevel, const char *app_id)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    3, app_id);
}
static inline void
xdg_toplevel_show_window_menu(struct xdg_toplevel *xdg_toplevel, struct wl_seat *seat, uint32_t serial, int32_t x, int32_t y)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    4, seat, serial, x, y);
}
static inline void
xdg_toplevel_move(struct xdg_toplevel *xdg_toplevel, struct wl_seat *seat, uint32_t serial)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    5, seat, serial);
}
static inline void
xdg_toplevel_resize(struct xdg_toplevel *xdg_toplevel, struct wl_seat *seat, uint32_t serial, uint32_t edges)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    6, seat, serial, edges);
}
static inline void
xdg_toplevel_set_max_size(struct xdg_toplevel *xdg_toplevel, int32_t width, int32_t height)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    7, width, height);
}
static inline void
xdg_toplevel_set_min_size(struct xdg_toplevel *xdg_toplevel, int32_t width, int32_t height)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    8, width, height);
}
static inline void
xdg_toplevel_set_maximized(struct xdg_toplevel *xdg_toplevel)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    9);
}
static inline void
xdg_toplevel_unset_maximized(struct xdg_toplevel *xdg_toplevel)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    10);
}
static inline void
xdg_toplevel_set_fullscreen(struct xdg_toplevel *xdg_toplevel, struct wl_output *output)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    11, output);
}
static inline void
xdg_toplevel_unset_fullscreen(struct xdg_toplevel *xdg_toplevel)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    12);
}
static inline void
xdg_toplevel_set_minimized(struct xdg_toplevel *xdg_toplevel)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_toplevel,
    13);
}
enum xdg_popup_error {
 XDG_POPUP_ERROR_INVALID_GRAB = 0,
};
struct xdg_popup_listener {
 void (*configure)(void *data,
     struct xdg_popup *xdg_popup,
     int32_t x,
     int32_t y,
     int32_t width,
     int32_t height);
 void (*popup_done)(void *data,
      struct xdg_popup *xdg_popup);
 void (*repositioned)(void *data,
        struct xdg_popup *xdg_popup,
        uint32_t token);
};
static inline int
xdg_popup_add_listener(struct xdg_popup *xdg_popup,
         const struct xdg_popup_listener *listener, void *data)
{
 return wl_proxy_add_listener((struct wl_proxy *) xdg_popup,
         (void (**)(void)) listener, data);
}
static inline void
xdg_popup_set_user_data(struct xdg_popup *xdg_popup, void *user_data)
{
 wl_proxy_set_user_data((struct wl_proxy *) xdg_popup, user_data);
}
static inline void *
xdg_popup_get_user_data(struct xdg_popup *xdg_popup)
{
 return wl_proxy_get_user_data((struct wl_proxy *) xdg_popup);
}
static inline uint32_t
xdg_popup_get_version(struct xdg_popup *xdg_popup)
{
 return wl_proxy_get_version((struct wl_proxy *) xdg_popup);
}
static inline void
xdg_popup_destroy(struct xdg_popup *xdg_popup)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_popup,
    0);
 wl_proxy_destroy((struct wl_proxy *) xdg_popup);
}
static inline void
xdg_popup_grab(struct xdg_popup *xdg_popup, struct wl_seat *seat, uint32_t serial)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_popup,
    1, seat, serial);
}
static inline void
xdg_popup_reposition(struct xdg_popup *xdg_popup, struct xdg_positioner *positioner, uint32_t token)
{
 wl_proxy_marshal((struct wl_proxy *) xdg_popup,
    2, positioner, token);
}
#ifdef ZAKERO_YETANI_IMPLEMENTATION
extern const struct wl_interface wl_output_interface;
extern const struct wl_interface wl_seat_interface;
extern const struct wl_interface wl_surface_interface;
extern const struct wl_interface xdg_popup_interface;
extern const struct wl_interface xdg_positioner_interface;
extern const struct wl_interface xdg_surface_interface;
extern const struct wl_interface xdg_toplevel_interface;
static const struct wl_interface *xdg_shell_types[] = {
 NULL,
 NULL,
 NULL,
 NULL,
 &xdg_positioner_interface,
 &xdg_surface_interface,
 &wl_surface_interface,
 &xdg_toplevel_interface,
 &xdg_popup_interface,
 &xdg_surface_interface,
 &xdg_positioner_interface,
 &xdg_toplevel_interface,
 &wl_seat_interface,
 NULL,
 NULL,
 NULL,
 &wl_seat_interface,
 NULL,
 &wl_seat_interface,
 NULL,
 NULL,
 &wl_output_interface,
 &wl_seat_interface,
 NULL,
 &xdg_positioner_interface,
 NULL,
};
static const struct wl_message xdg_wm_base_requests[] = {
 { "destroy", "", xdg_shell_types + 0 },
 { "create_positioner", "n", xdg_shell_types + 4 },
 { "get_xdg_surface", "no", xdg_shell_types + 5 },
 { "pong", "u", xdg_shell_types + 0 },
};
static const struct wl_message xdg_wm_base_events[] = {
 { "ping", "u", xdg_shell_types + 0 },
};
const struct wl_interface xdg_wm_base_interface = {
 "xdg_wm_base", 3,
 4, xdg_wm_base_requests,
 1, xdg_wm_base_events,
};
static const struct wl_message xdg_positioner_requests[] = {
 { "destroy", "", xdg_shell_types + 0 },
 { "set_size", "ii", xdg_shell_types + 0 },
 { "set_anchor_rect", "iiii", xdg_shell_types + 0 },
 { "set_anchor", "u", xdg_shell_types + 0 },
 { "set_gravity", "u", xdg_shell_types + 0 },
 { "set_constraint_adjustment", "u", xdg_shell_types + 0 },
 { "set_offset", "ii", xdg_shell_types + 0 },
 { "set_reactive", "3", xdg_shell_types + 0 },
 { "set_parent_size", "3ii", xdg_shell_types + 0 },
 { "set_parent_configure", "3u", xdg_shell_types + 0 },
};
const struct wl_interface xdg_positioner_interface = {
 "xdg_positioner", 3,
 10, xdg_positioner_requests,
 0, NULL,
};
static const struct wl_message xdg_surface_requests[] = {
 { "destroy", "", xdg_shell_types + 0 },
 { "get_toplevel", "n", xdg_shell_types + 7 },
 { "get_popup", "n?oo", xdg_shell_types + 8 },
 { "set_window_geometry", "iiii", xdg_shell_types + 0 },
 { "ack_configure", "u", xdg_shell_types + 0 },
};
static const struct wl_message xdg_surface_events[] = {
 { "configure", "u", xdg_shell_types + 0 },
};
const struct wl_interface xdg_surface_interface = {
 "xdg_surface", 3,
 5, xdg_surface_requests,
 1, xdg_surface_events,
};
static const struct wl_message xdg_toplevel_requests[] = {
 { "destroy", "", xdg_shell_types + 0 },
 { "set_parent", "?o", xdg_shell_types + 11 },
 { "set_title", "s", xdg_shell_types + 0 },
 { "set_app_id", "s", xdg_shell_types + 0 },
 { "show_window_menu", "ouii", xdg_shell_types + 12 },
 { "move", "ou", xdg_shell_types + 16 },
 { "resize", "ouu", xdg_shell_types + 18 },
 { "set_max_size", "ii", xdg_shell_types + 0 },
 { "set_min_size", "ii", xdg_shell_types + 0 },
 { "set_maximized", "", xdg_shell_types + 0 },
 { "unset_maximized", "", xdg_shell_types + 0 },
 { "set_fullscreen", "?o", xdg_shell_types + 21 },
 { "unset_fullscreen", "", xdg_shell_types + 0 },
 { "set_minimized", "", xdg_shell_types + 0 },
};
static const struct wl_message xdg_toplevel_events[] = {
 { "configure", "iia", xdg_shell_types + 0 },
 { "close", "", xdg_shell_types + 0 },
};
const struct wl_interface xdg_toplevel_interface = {
 "xdg_toplevel", 3,
 14, xdg_toplevel_requests,
 2, xdg_toplevel_events,
};
static const struct wl_message xdg_popup_requests[] = {
 { "destroy", "", xdg_shell_types + 0 },
 { "grab", "ou", xdg_shell_types + 22 },
 { "reposition", "3ou", xdg_shell_types + 24 },
};
static const struct wl_message xdg_popup_events[] = {
 { "configure", "iiii", xdg_shell_types + 0 },
 { "popup_done", "", xdg_shell_types + 0 },
 { "repositioned", "3u", xdg_shell_types + 0 },
};
const struct wl_interface xdg_popup_interface = {
 "xdg_popup", 3,
 3, xdg_popup_requests,
 3, xdg_popup_events,
};
#endif // ZAKERO_YETANI_IMPLEMENTATION
// }}}
// }}}
 
namespace zakero
{
        // {{{ Declaration
 
        class Yetani
        {
                public:
#define X(name_, val_, mesg_) \
                        static constexpr int name_ = val_;
                        ZAKERO_YETANI__ERROR_DATA
#undef X
 
                        virtual ~Yetani() noexcept;
 
                        // {{{ Type : Key
 
                        enum struct KeyState
                        {       Released = 0
                        ,       Pressed  = 1
                        ,       Repeat   = 2
                        };
 
                        struct Key
                        {
                                uint32_t time;
                                uint32_t code;
                                KeyState state;
                        };
 
                        static constexpr uint32_t KeyModifier_Shift    = 0x00000001;
                        static constexpr uint32_t KeyModifier_CapsLock = 0x00000002;
                        static constexpr uint32_t KeyModifier_Control  = 0x00000004;
                        static constexpr uint32_t KeyModifier_Alt      = 0x00000008;
                        static constexpr uint32_t KeyModifier_NumLock  = 0x00000010;
                        static constexpr uint32_t KeyModifier_Meta     = 0x00000040;
 
                        struct KeyModifier
                        {
                                uint32_t pressed = 0;
                                uint32_t latched = 0;
                                uint32_t locked  = 0;
                                uint32_t group   = 0;
                        };
 
                        // }}}
                        // {{{ Type : Point
 
                        struct PointMm
                        {
                                uint32_t time;
                                float    x;
                                float    y;
 
                                friend bool operator==(Yetani::PointMm&, Yetani::PointMm&) noexcept;
                        };
 
                        struct PointPercent
                        {
                                uint32_t time;
                                float    x;
                                float    y;
 
                                friend bool operator==(Yetani::PointPercent&, Yetani::PointPercent&) noexcept;
                        };
 
                        struct PointPixel
                        {
                                uint32_t time;
                                int32_t  x;
                                int32_t  y;
 
                                friend bool operator==(Yetani::PointPixel&, Yetani::PointPixel&) noexcept;
                        };
 
                        // }}}
                        // {{{ Type : Pointer Axis
 
                        enum struct PointerAxisSource
                        {       Unknown
                        ,       Continuous
                        ,       Finger
                        ,       Wheel
                        ,       Wheel_Tilt
                        };
 
                        enum struct PointerAxisType
                        {       Unknown
                        ,       Horizontal
                        ,       Vertical
                        };
 
                        struct PointerAxis
                        {
                                uint32_t                  time;
                                int32_t                   steps;
                                float                     distance;
                                Yetani::PointerAxisSource source;
                                Yetani::PointerAxisType   type;
                        };
 
                        // }}}
                        // {{{ Type : Pointer Button
 
                        enum struct PointerButtonState
                        {       Released = 0
                        ,       Pressed  = 1
                        };
 
                        struct PointerButton
                        {
                                uint32_t                   code;
                                Yetani::PointerButtonState state;
                        };
 
                        // }}}
                        // {{{ Type : Size
 
                        struct SizeMm
                        {
                                float width;
                                float height;
 
                                friend bool operator==(Yetani::SizeMm&, Yetani::SizeMm&) noexcept;
                        };
 
                        struct SizePercent
                        {
                                float width;
                                float height;
 
                                friend bool operator==(Yetani::SizePercent&, Yetani::SizePercent&) noexcept;
                        };
 
                        struct SizePixel
                        {
                                int32_t width;
                                int32_t height;
 
                                friend bool operator==(Yetani::SizePixel&, Yetani::SizePixel&) noexcept;
                        };
 
                        // }}}
                        // {{{ Connection
 
                        static Yetani* connect() noexcept;
                        static Yetani* connect(const std::string&) noexcept;
                        static Yetani* connect(std::error_code&) noexcept;
                        static Yetani* connect(const std::string&, std::error_code&) noexcept;
 
                        // }}}
                        // {{{ Cursor
 
                        struct CursorConfig
                        {
                                Yetani::SizePixel         size           = {};
                                wl_shm_format             format         = WL_SHM_FORMAT_ARGB8888;
                                int32_t                   hotspot_x      = 0;
                                int32_t                   hotspot_y      = 0;
                                std::chrono::milliseconds time_per_frame = std::chrono::milliseconds(0);
                                const std::vector<void*>& image_data;
                        };
 
                        // -------------------------------------------------- //
 
                        std::error_code cursorCreate(const std::string&, const Yetani::CursorConfig&) noexcept;
                        std::error_code cursorDestroy(const std::string&) noexcept;
 
                        // }}}
                        // {{{ Keyboard
 
                        int32_t keyRepeatDelay() const noexcept;
                        int32_t keyRepeatRate() const noexcept;
 
                        // }}}
                        // {{{ Output : Wayland
 
                        struct Output
                        {
                                std::string make                     = "";
                                std::string model                    = "";
                                int32_t     x                        = 0;
                                int32_t     y                        = 0;
                                int32_t     width                    = 0;
                                int32_t     height                   = 0;
                                uint32_t    physical_width_mm        = 0;
                                uint32_t    physical_height_mm       = 0;
                                int32_t     subpixel                 = 0;
                                int32_t     refresh_mHz              = 0;
                                int32_t     scale_factor             = 0;
                                int32_t     transform                = 0;
                                uint32_t    flags                    = 0;
                                float       pixels_per_mm_horizontal = 0.0;
                                float       pixels_per_mm_vertical   = 0.0;
                        };
 
                        // -------------------------------------------------- //
 
                        using OutputId = uint32_t;
 
                        using LambdaOutputId = std::function<void(const Yetani::OutputId)>;
 
                        using VectorOutputId = std::vector<OutputId>;
 
                        // -------------------------------------------------- //
 
                        Yetani::Output         output(const Yetani::OutputId) const noexcept;
                        Yetani::VectorOutputId outputVector() const noexcept;
                        static std::string     outputSubpixelName(int32_t) noexcept;
                        static std::string     outputTransformName(int32_t) noexcept;
 
                        Yetani::PointMm        outputConvertToMm(const Yetani::OutputId, const Yetani::PointPixel&) const noexcept;
                        Yetani::PointPercent   outputConvertToPercent(const Yetani::OutputId, const Yetani::PointPixel&) const noexcept;
                        Yetani::PointPixel     outputConvertToPixel(const Yetani::OutputId, const Yetani::PointMm&) const noexcept;
                        Yetani::PointPixel     outputConvertToPixel(const Yetani::OutputId, const Yetani::PointPercent&) const noexcept;
 
                        Yetani::SizeMm         outputConvertToMm(const Yetani::OutputId, const Yetani::SizePixel&) const noexcept;
                        Yetani::SizePercent    outputConvertToPercent(const Yetani::OutputId, const Yetani::SizePixel&) const noexcept;
                        Yetani::SizePixel      outputConvertToPixel(const Yetani::OutputId, const Yetani::SizeMm&) const noexcept;
                        Yetani::SizePixel      outputConvertToPixel(const Yetani::OutputId, const Yetani::SizePercent&) const noexcept;
 
                        void                   outputOnAdd(Yetani::LambdaOutputId) noexcept;
                        void                   outputOnChange(Yetani::LambdaOutputId) noexcept;
                        void                   outputOnRemove(Yetani::LambdaOutputId) noexcept;
 
                        // }}}
                        // {{{ Output : Xdg
 
                        /* Future
                        struct XdgOutput
                        {
                                std::string xdg_name;
                                std::string xdg_description;
                                int32_t     xdg_logical_x;
                                int32_t     xdg_logical_y;
                                int32_t     xdg_logical_width;
                                int32_t     xdg_logical_height;
                        };
 
                        using MapXdgOutputData = std::unordered_map<OutputId, XdgOutput>;
 
                        // -------------------------------------------------- //
 
                        const MapOutputIdXdgOutput& xdgOutputMap() const noexcept;
                        */
 
                        // }}}
                        // {{{ Shared Memory
 
                        using VectorShmFormat = std::vector<wl_shm_format>;
 
                        // -------------------------------------------------- //
 
                        const Yetani::VectorShmFormat& shmFormatAvailable() const noexcept;
                        static uint8_t                 shmFormatBytesPerPixel(const wl_shm_format) noexcept;
                        static std::string             shmFormatDescription(const wl_shm_format) noexcept;
                        static std::string             shmFormatName(const wl_shm_format) noexcept;
 
                        // }}}
                        // {{{ Window
 
                        enum struct WindowDecorations
                        {       Client_Side
                        ,       Server_Side
                        };
 
                        enum struct WindowMode
                        {       Normal
                        ,       Fullscreen
                        ,       Maximized
                        };
 
                        // -------------------------------------------------- //
 
                        using Lambda                  = std::function<void()>;
                        using LambdaKey               = std::function<void(const Yetani::Key&, const Yetani::KeyModifier&)>;
                        using LambdaAxis              = std::function<void(const Yetani::PointerAxis&, const Yetani::KeyModifier&)>;
                        using LambdaButtonMm          = std::function<void(const Yetani::PointerButton&, const Yetani::PointMm&, const Yetani::KeyModifier&)>;
                        using LambdaButtonPercent     = std::function<void(const Yetani::PointerButton&, const Yetani::PointPercent&, const Yetani::KeyModifier&)>;
                        using LambdaButtonPixel       = std::function<void(const Yetani::PointerButton&, const Yetani::PointPixel&, const Yetani::KeyModifier&)>;
                        using LambdaPointMm           = std::function<void(const Yetani::PointMm&, const Yetani::KeyModifier&)>;
                        using LambdaPointPercent      = std::function<void(const Yetani::PointPercent&, const Yetani::KeyModifier&)>;
                        using LambdaPointPixel        = std::function<void(const Yetani::PointPixel&, const Yetani::KeyModifier&)>;
                        using LambdaBool              = std::function<void(bool)>;
                        using LambdaWindowDecorations = std::function<void(Yetani::WindowDecorations)>;
                        using LambdaWindowMode        = std::function<void(Yetani::WindowMode)>;
                        using LambdaSizeMm            = std::function<void(const Yetani::SizeMm&)>;
                        using LambdaSizePercent       = std::function<void(const Yetani::SizePercent&)>;
                        using LambdaSizePixel         = std::function<void(const Yetani::SizePixel&)>;
 
                        // -------------------------------------------------- //
 
                        class Window
                        {
                                public:
                                        Window(void*);
                                        virtual ~Window();
 
                                        // {{{ Configuration
 
                                        void                 classSet(const std::string&) noexcept;
                                        void                 titleSet(const std::string&) noexcept;
 
                                        // }}}
                                        // {{{ Decorations
 
                                        std::error_code      decorationsSet(const Yetani::WindowDecorations) noexcept;
                                        void                 decorationsOnChange(Yetani::LambdaWindowDecorations) noexcept;
 
                                        // }}}
                                        // {{{ Size
 
                                        std::error_code      sizeSet(const Yetani::SizeMm&) noexcept;
                                        std::error_code      sizeSet(const Yetani::SizePercent&) noexcept;
                                        std::error_code      sizeSet(const Yetani::SizePixel&) noexcept;
                                        std::error_code      sizeSetMinMax(const Yetani::SizeMm&, const Yetani::SizeMm&) noexcept;
                                        std::error_code      sizeSetMinMax(const Yetani::SizePercent&, const Yetani::SizePercent&) noexcept;
                                        std::error_code      sizeSetMinMax(const Yetani::SizePixel&, const Yetani::SizePixel&) noexcept;
                                        void                 sizeOnChange(Yetani::LambdaSizeMm) noexcept;
                                        void                 sizeOnChange(Yetani::LambdaSizePercent) noexcept;
                                        void                 sizeOnChange(Yetani::LambdaSizePixel) noexcept;
 
                                        // }}}
                                        // {{{ Window Mode
 
                                        Yetani::WindowMode   windowMode() noexcept;
                                        bool                 windowModeIs(const Yetani::WindowMode) noexcept;
                                        void                 windowModeSet(const Yetani::WindowMode) noexcept;
                                        void                 windowModeOnChange(Yetani::LambdaWindowMode) noexcept;
 
                                        void                 minimize() noexcept;
 
                                        // }}}
                                        // {{{ Rendering
 
                                        std::error_code      imageNext(uint8_t*&, Yetani::SizePixel&) noexcept;
                                        void                 imagePresent() noexcept;
                                        uint32_t             time() const noexcept;
                                        uint8_t              bytesPerPixel() const noexcept;
 
                                        // }}}
                                        // {{{ Conversion
 
                                        Yetani::PointMm      convertToMm(const Yetani::PointPixel&) const noexcept;
                                        Yetani::PointPercent convertToPercent(const Yetani::PointPixel&) const noexcept;
                                        Yetani::PointPixel   convertToPixel(const Yetani::PointMm&) const noexcept;
                                        Yetani::PointPixel   convertToPixel(const Yetani::PointPercent&) const noexcept;
 
                                        Yetani::SizeMm       convertToMm(const Yetani::SizePixel&) const noexcept;
                                        Yetani::SizePercent  convertToPercent(const Yetani::SizePixel&) const noexcept;
                                        Yetani::SizePixel    convertToPixel(const Yetani::SizeMm&) const noexcept;
                                        Yetani::SizePixel    convertToPixel(const Yetani::SizePercent&) const noexcept;
 
                                        // }}}
                                        // {{{ Cursor
 
                                        std::error_code      cursorUse(const std::string&) noexcept;
                                        void                 cursorHide() noexcept;
                                        void                 cursorShow() noexcept;
 
                                        // }}}
                                        // {{{ Keyboard
 
                                        void                 keyboardOnEnter(Yetani::Lambda) noexcept;
                                        void                 keyboardOnLeave(Yetani::Lambda) noexcept;
                                        void                 keyboardOnKey(Yetani::LambdaKey) noexcept;
 
                                        // }}}
                                        // {{{ Pointer
 
                                        void                 pointerOnAxis(Yetani::LambdaAxis) noexcept;
                                        void                 pointerOnButton(Yetani::LambdaButtonMm) noexcept;
                                        void                 pointerOnButton(Yetani::LambdaButtonPercent) noexcept;
                                        void                 pointerOnButton(Yetani::LambdaButtonPixel) noexcept;
                                        void                 pointerOnEnter(Yetani::LambdaPointMm) noexcept;
                                        void                 pointerOnEnter(Yetani::LambdaPointPercent) noexcept;
                                        void                 pointerOnEnter(Yetani::LambdaPointPixel) noexcept;
                                        void                 pointerOnLeave(Yetani::Lambda) noexcept;
                                        void                 pointerOnMotion(Yetani::LambdaPointMm) noexcept;
                                        void                 pointerOnMotion(Yetani::LambdaPointPercent) noexcept;
                                        void                 pointerOnMotion(Yetani::LambdaPointPixel) noexcept;
 
                                        // Not Used? Or Future?
                                        void                 pointerOnAxisSource(Yetani::Lambda) noexcept;
                                        void                 pointerOnAxisStop(Yetani::Lambda) noexcept;
                                        void                 pointerOnAxisDiscrete(Yetani::Lambda) noexcept;
 
                                        // }}}
                                        // {{{ Events
 
                                        void                 onCloseRequest(Yetani::Lambda) noexcept;
                                        void                 onFocusChange(Yetani::LambdaBool) noexcept;
 
                                        // }}}
 
                                        struct Memory
                                        {
                                                struct wl_shm_pool* wl_shm_pool;
                                                zakero::MemoryPool  memory_pool;
                                        };
 
                                private:
                                        Yetani*                             yetani;
                                        struct wl_buffer*                   wl_buffer;
                                        struct wl_surface*                  wl_surface;
                                        struct xdg_surface*                 xdg_surface;
                                        struct xdg_toplevel*                xdg_toplevel;
                                        struct zxdg_toplevel_decoration_v1* xdg_decoration;
                                        Yetani::Window::Memory              window_memory;
                                        wl_shm_format                       pixel_format;
 
                                        Window(const Window&) = delete;
                                        Window& operator=(const Window&) = delete;
                        };
 
                        // -------------------------------------------------- //
 
                        static constexpr wl_shm_format SHM_FORMAT_DEFAULT = WL_SHM_FORMAT_XRGB8888;
 
                        // -------------------------------------------------- //
 
                        Yetani::Window* windowCreate(const Yetani::SizeMm&, std::error_code&) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizeMm&, const wl_shm_format = SHM_FORMAT_DEFAULT) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizeMm&, const wl_shm_format, std::error_code&) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizePercent&, std::error_code&) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizePercent&, const wl_shm_format = SHM_FORMAT_DEFAULT) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizePercent&, const wl_shm_format, std::error_code&) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizePixel&, std::error_code&) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizePixel&, const wl_shm_format = SHM_FORMAT_DEFAULT) noexcept;
                        Yetani::Window* windowCreate(const Yetani::SizePixel&, const wl_shm_format, std::error_code&) noexcept;
 
                        // }}}
 
                private:
                        static constexpr uint32_t Size_Max = (uint32_t)std::numeric_limits<int32_t>::max();
 
                        Yetani() noexcept;
 
                        // {{{ Type
 
                        using VectorWlSurface = std::vector<struct wl_surface*>;
 
                        // }}}
                        // {{{ Connection
 
                        void disconnect() noexcept;
 
                        // }}}
                        // {{{ Cursor
 
                        struct Cursor
                        {
                                struct wl_surface*        wl_surface      = nullptr;
                                std::vector<::wl_buffer*> buffer_vector   = {};
                                wl_shm_format             format          = WL_SHM_FORMAT_ARGB8888;
                                int64_t                   next_frame_time = 0;
                                size_t                    buffer_index    = 0;
                                uint32_t                  time_per_frame  = 0;
                                int32_t                   width           = 0;
                                int32_t                   height          = 0;
                                int32_t                   hotspot_x       = 0;
                                int32_t                   hotspot_y       = 0;
                        };
 
                        using MapStringCursor = std::unordered_map<std::string, Yetani::Cursor>;
 
                        MapStringCursor cursor_map;
 
                        // -------------------------------------------------- //
 
                        struct CursorSurface
                        {
                                struct wl_pointer* wl_pointer;
                                struct wl_surface* wl_surface;
                                uint32_t           serial;
                                int32_t            hotspot_x;
                                int32_t            hotspot_y;
                                bool               is_visible;
                        };
 
                        using MapCursorSurface = std::unordered_map<struct wl_surface*, Yetani::CursorSurface>;
 
                        MapCursorSurface cursor_surface_map;
 
                        // -------------------------------------------------- //
 
                        zakero::MemoryPool  cursor_memory_pool;
                        mutable std::mutex  cursor_mutex;
                        struct wl_shm_pool* cursor_shm_pool;
                        struct wl_pointer*  cursor_pointer;
 
                        // -------------------------------------------------- //
 
                        void            cursorAnimate() noexcept;
                        std::error_code cursorCreateCursor(const std::string&, const Yetani::CursorConfig&) noexcept;
                        void            cursorEnter(struct wl_pointer*, uint32_t, struct wl_surface*) noexcept;
                        void            cursorLeave(struct wl_surface*) noexcept;
                        void            cursorHide(struct wl_surface*) noexcept;
                        void            cursorShow(struct wl_surface*) noexcept;
                        bool            cursorIsHidden(struct wl_surface*) const noexcept;
                        void            cursorSetup() noexcept;
                        void            cursorTeardown() noexcept;
                        std::error_code cursorAttach(const std::string&, struct wl_surface*) noexcept;
                        std::error_code cursorDetach(struct wl_surface*) noexcept;
 
                        // }}}
                        // {{{ Event Loop
 
                        std::jthread      event_loop;
                        std::atomic<bool> event_loop_is_running;
 
                        // -------------------------------------------------- //
 
                        void        eventLoopStart() noexcept;
                        static void eventLoop(std::stop_token, Yetani*) noexcept;
 
                        // }}}
                        // {{{ Wayland
 
                        struct wl_compositor*   compositor;
                        struct wl_display*      display;
                        struct wl_registry*     registry;
                        struct wl_shm*          shm;
                        Yetani::VectorShmFormat shm_format_vector;
 
                        // }}}
                        // {{{ Wayland : Seat
 
                        struct Seat
                        {
                                struct wl_keyboard* wl_keyboard = nullptr;
                                struct wl_pointer*  wl_pointer  = nullptr;
                                struct wl_touch*    wl_touch    = nullptr;
                                std::string         name        = "";
                                uint32_t            version     = 0;
                        };
 
                        using MapSeat     = std::map<struct wl_seat*, Seat>;
                        using MapIdWlSeat = std::map<uint32_t, struct wl_seat*>;
 
                        Yetani::MapSeat     seat_map;
                        Yetani::MapIdWlSeat id_to_seat;
 
                        // -------------------------------------------------- //
 
                        struct wl_seat* seat;
 
                        // -------------------------------------------------- //
 
                        void seatDestroy(struct wl_seat*&) noexcept;
 
                        // }}}
                        // {{{ Wayland : Seat : Keyboard
 
                        struct KeyRepeatData
                        {
                                std::chrono::time_point<std::chrono::steady_clock> trigger_time = {};
                                uint32_t                                           base_time    = 0;
                        };
 
                        using KeyRepeatMap = std::map<uint32_t, Yetani::KeyRepeatData>;
 
                        // -------------------------------------------------- //
 
                        struct KeyboardEvent
                        {
                                Yetani::Lambda    on_enter = {};
                                Yetani::Lambda    on_leave = {};
                                Yetani::LambdaKey on_key   = {};
                        };
 
                        using MapKeyboardEvent = std::unordered_map<struct wl_surface*, Yetani::KeyboardEvent>;
 
                        // -------------------------------------------------- //
 
                        struct Keyboard
                        {
                                struct wl_surface*       wl_surface   = nullptr;
                                Yetani::KeyboardEvent*   event        = nullptr;
                                Yetani::MapKeyboardEvent event_map    = {};
                                Yetani::KeyModifier      modifier     = {};
                                Yetani::KeyRepeatMap     repeat_map   = {};
                                char*                    keymap       = nullptr;
                                uint32_t                 keymap_size  = 0;
                                int32_t                  repeat_delay = 0;
                                int32_t                  repeat_rate  = 0;
                        };
 
                        Yetani::Keyboard keyboard;
 
                        // -------------------------------------------------- //
 
                        static void keyboardDestroy(Yetani::Keyboard&) noexcept;
                        static void keyboardRepeat(Yetani::Keyboard&) noexcept;
                        static void keyboardRepeatAdd(Yetani::Keyboard&, uint32_t, uint32_t) noexcept;
                        static void keyboardRepeatReleaseAll(Yetani::Keyboard&) noexcept;
                        static void keyboardRepeatRemove(Yetani::Keyboard&, uint32_t) noexcept;
 
                        // }}}
                        // {{{ Wayland : Seat : Pointer
 
                        struct PointerEvent
                        {
                                Yetani::LambdaAxis          on_axis           = {};
                                Yetani::Lambda              on_axis_discrete  = {};
                                Yetani::Lambda              on_axis_source    = {};
                                Yetani::Lambda              on_axis_stop      = {};
                                Yetani::LambdaButtonMm      on_button_mm      = {};
                                Yetani::LambdaButtonPercent on_button_percent = {};
                                Yetani::LambdaButtonPixel   on_button_pixel   = {};
                                Yetani::LambdaPointMm       on_enter_mm       = {};
                                Yetani::LambdaPointPercent  on_enter_percent  = {};
                                Yetani::LambdaPointPixel    on_enter_pixel    = {};
                                Yetani::Lambda              on_leave          = {};
                                Yetani::LambdaPointMm       on_motion_mm      = {};
                                Yetani::LambdaPointPercent  on_motion_percent = {};
                                Yetani::LambdaPointPixel    on_motion_pixel   = {};
                        };
 
                        using MapPointerEvent = std::unordered_map<struct wl_surface*, Yetani::PointerEvent>;
 
                        // -------------------------------------------------- //
 
                        struct Pointer
                        {
                                // --- Common --- //
                                Yetani*                 yetani            = nullptr;
                                struct wl_surface*      wl_surface        = nullptr;
                                struct wl_pointer*      wl_pointer        = nullptr;
                                Yetani::PointerEvent*   event             = nullptr;
                                Yetani::MapPointerEvent event_map         = {};
 
                                // --- Processed Data --- //
                                Yetani::PointMm         point_mm          = {};
                                Yetani::PointPercent    point_percent     = {};
                                Yetani::PointPixel      point_pixel       = {};
 
                                // --- Axis --- //
                                Yetani::PointerAxis     axis              = {};
 
                                // --- Button --- //
                                Yetani::PointerButton   button            = {};
                                uint32_t                button_event_code = 0;
                                bool                    button_is_pressed = false;
                                uint32_t                button_time       = {};
 
                                // --- Enter --- //
                                struct wl_surface*      enter_surface     = nullptr;
                                Yetani::PointPixel      enter_point       = {};
                                uint32_t                enter_serial      = 0;
 
                                // --- Leave --- //
                                struct wl_surface*      leave_surface     = nullptr;
 
                                // --- Motion --- //
                                Yetani::PointPixel      motion_point      = {};
                        };
 
                        Yetani::Pointer pointer;
 
                        // -------------------------------------------------- //
 
                        static void pointerClear(struct Pointer&) noexcept;
 
                        // }}}
                        // {{{ Wayland : Output
 
                        enum struct OutputState
                        {       Done
                        ,       Added
                        ,       Changed
                        };
 
                        // -------------------------------------------------- //
 
                        using VectorWlOutput = std::vector<struct wl_output*>;
 
                        using MapWlOutputOutputState     = std::unordered_map<struct wl_output*, Yetani::OutputState>;
                        using MapOutputIdWlOutput        = std::unordered_map<Yetani::OutputId, struct wl_output*>;
                        using MapWlOutputOutputId        = std::unordered_map<struct wl_output*, Yetani::OutputId>;
                        using MapWlSurfaceVectorWlOutput = std::unordered_map<struct wl_surface*, Yetani::VectorWlOutput>;
                        using MapWlOutputOutput          = std::unordered_map<struct wl_output*, Output>;
 
                        // -------------------------------------------------- //
 
                        struct OutputData
                        {
                                Yetani::MapWlSurfaceVectorWlOutput surface_output_map   = {};
                                Yetani::MapOutputIdWlOutput        outputid_to_wloutput = {};
                                Yetani::MapWlOutputOutput          output_map           = {};
                                Yetani::MapWlOutputOutputId        wloutput_to_outputid = {};
                                mutable std::mutex                 mutex                = {};
                        };
 
                        Yetani::OutputData output_data;
 
                        // -------------------------------------------------- //
 
                        Yetani::LambdaOutputId         on_output_add;
                        Yetani::LambdaOutputId         on_output_change;
                        Yetani::LambdaOutputId         on_output_remove;
 
                        Yetani::MapWlOutputOutput      output_changes_map;
                        Yetani::MapWlOutputOutputState output_state_map;
 
                        Yetani::VectorWlSurface        output_notify_surface_vector;
 
                        // -------------------------------------------------- //
 
                        void                        convertPixel(struct wl_surface*, const int32_t, const int32_t, float&, float&, float&, float&) const noexcept;
 
                        std::pair<float, float>     convertPixelToMm(const Yetani::Output&, int32_t, int32_t) const noexcept;
                        std::pair<float, float>     convertPixelToPercent(const Yetani::Output&, int32_t, int32_t) const noexcept;
                        std::pair<int32_t, int32_t> convertMmToPixel(const Yetani::Output&, float, float) const noexcept;
                        std::pair<int32_t, int32_t> convertPercentToPixel(const Yetani::Output&, float, float) const noexcept;
 
                        static void                 outputNotifySurface(Yetani*, struct wl_output*, struct wl_surface*) noexcept;
 
                        // }}}
                        // {{{ Wayland : Buffer
 
                        struct SurfaceSize;
 
                        struct BufferData
                        {
                                MemoryPool* memory_pool = nullptr;
                                off_t       offset      = 0;
                        };
 
                        using MapBufferData = std::unordered_map<struct wl_buffer*, BufferData>;
 
                        // -------------------------------------------------- //
 
                        struct Buffer
                        {
                                MapBufferData map   = {};
                                std::mutex    mutex = {};
                        };
 
                        Buffer buffer;
 
                        // -------------------------------------------------- //
 
                        static wl_buffer* bufferCreate(Yetani::SurfaceSize&, Yetani::Window::Memory*, Yetani::Buffer*) noexcept;
                        static void       bufferDestroy(struct wl_buffer*&) noexcept;
 
                        // }}}
                        // {{{ Wayland : Surface
 
                        struct SurfaceEvent
                        {
                                Yetani::LambdaSizeMm      on_size_mm_change      = {};
                                Yetani::LambdaSizePercent on_size_percent_change = {};
                                Yetani::LambdaSizePixel   on_size_pixel_change   = {};
                        };
 
                        using MapSurfaceEvent = std::map<struct wl_surface*, Yetani::SurfaceEvent>;
 
                        MapSurfaceEvent surface_event_map;
 
                        // -------------------------------------------------- //
 
                        enum struct SizeUnit
                        {       Millimeter
                        ,       Percent
                        ,       Pixel
                        };
 
                        // This is the data that needs to be locked from resizing
                        // Use mainly by XdgSurface related methods
                        struct SurfaceExtent
                        {
                                Yetani::SizeUnit    preferred_unit    = {};
                                Yetani::SizeMm      preferred_mm      = {};
                                Yetani::SizePercent preferred_percent = {};
                                Yetani::SizeMm      size_mm           = {};
                                Yetani::SizePercent size_percent      = {};
                                Yetani::SizePixel   size_pixel        = {};
                                Yetani::SizePixel   size_pixel_max    = {};
                                Yetani::SizePixel   size_pixel_min    = {};
                        };
 
                        using MapSurfaceExtent = std::unordered_map<struct wl_surface*, Yetani::SurfaceExtent>;
 
                        MapSurfaceExtent surface_extent_map;
                        std::mutex       surface_extent_mutex; // For surface adding and removing
 
                        // -------------------------------------------------- //
 
                        struct SurfaceFrame
                        {
                                struct wl_surface*      wl_surface  = nullptr;
                                std::atomic<wl_buffer*> buffer_next = {};
                                uint32_t                width       = 0;
                                uint32_t                height      = 0;
                                uint32_t                time_ms     = 0;
                        };
 
                        using MapSurfaceFrame = std::unordered_map<struct wl_surface*, Yetani::SurfaceFrame>;
 
                        MapSurfaceFrame surface_frame_map;
 
                        // -------------------------------------------------- //
 
                        struct SurfaceSize
                        {
                                int32_t       width;
                                int32_t       height;
                                int32_t       stride;
                                uint32_t      in_bytes;
                                wl_shm_format pixel_format;
                                uint8_t       bytes_per_pixel;
                        };
 
                        using MapSurfaceSize = std::unordered_map<struct wl_surface*, Yetani::SurfaceSize>;
 
                        MapSurfaceSize surface_size_map;
 
                        // -------------------------------------------------- //
 
                        using MapSurfaceResizeMutex = std::unordered_map<struct wl_surface*, std::mutex>;
 
                        MapSurfaceResizeMutex surface_resize_mutex_map;
 
                        // -------------------------------------------------- //
 
                        static void               surfaceCalculateSize(Yetani*, struct wl_surface*, const Yetani::SizePixel&) noexcept;
                        static struct wl_surface* surfaceCreate(Yetani*, const wl_shm_format, const Yetani::SizePixel&, Yetani::Window::Memory&) noexcept;
                        static void               surfaceDestroy(Yetani*, struct wl_surface*&) noexcept;
 
                        // }}}
                        // {{{ Window
 
                        struct WindowData
                        {
                                Yetani*             yetani;
                                struct wl_shm*      wl_shm;
                                struct wl_output*   wl_output;
                                std::string         file_name;
                                Yetani::SizeMm      size_mm;
                                Yetani::SizePercent size_percent;
                                Yetani::SizePixel   size_pixel;
                                Yetani::SizeUnit    size_unit;
                                wl_shm_format       pixel_format;
                                std::error_code     error;
                        };
 
                        // -------------------------------------------------- //
 
                        Yetani::Window* windowCreate(const Yetani::SizeUnit, const Yetani::SizeMm&, const Yetani::SizePercent&, const Yetani::SizePixel&, const wl_shm_format, std::error_code&) noexcept;
                        void            windowDataInit(Yetani::WindowData&) noexcept;
                        void            windowDataInitOutput(Yetani::WindowData&) noexcept;
                        void            windowInitMemory(Yetani::WindowData&, Yetani::Window::Memory&) noexcept;
                        void            windowInitOutput(Yetani::WindowData&, struct wl_surface*) noexcept;
                        void            windowEraseMemory(Yetani::Window::Memory&) noexcept;
                        void            windowEraseOutput(struct wl_surface*) noexcept;
                        void            windowEraseSurfaceExtent(struct wl_surface*) noexcept;
 
                        // }}}
                        // {{{ Utility
 
                        std::vector<Yetani::Window*> window_vector;
                        std::mutex                   window_vector_mutex;
 
                        // -------------------------------------------------- //
 
                        void windowAdd(Yetani::Window*) noexcept;
                        void windowRemove(Yetani::Window*) noexcept;
 
                        // }}}
                        // {{{ XDG
 
                        enum XdgState : int32_t
                        {       Unknown                    = 0
                        ,       Toplevel_Active            = 1
                        ,       Toplevel_Attach_Buffer     = 2
                        ,       Toplevel_Resizing          = 3
                        ,       Toplevel_Window_Fullscreen = 4
                        ,       Toplevel_Window_Maximized  = 5
                        ,       Toplevel_Window_Normal     = 6
                        ,       Toplevel_Decoration        = 7
                        };
 
                        using VectorXdgStateChange = std::vector<int32_t>;
                        using MapXdgStateChange    = std::unordered_map<struct xdg_surface*, Yetani::VectorXdgStateChange>;
 
                        Yetani::MapXdgStateChange xdg_state_change_map;
                        std::mutex                xdg_state_change_mutex;
 
                        // -------------------------------------------------- //
 
                        struct xdg_wm_base* xdg_wm_base;
 
                        // -------------------------------------------------- //
 
                        static Yetani::WindowMode toWindowMode(const Yetani::XdgState) noexcept;
                        static Yetani::XdgState   toXdgState(const Yetani::WindowMode) noexcept;
 
                        // }}}
                        // {{{ XDG : Surface
 
                        struct XdgSurface
                        {
                                Yetani*            yetani     = nullptr;
                                struct wl_surface* wl_surface = nullptr;
                        };
 
                        using MapXdgSurface = std::unordered_map<struct wl_surface*, Yetani::XdgSurface>;
 
                        Yetani::MapXdgSurface xdg_surface_map;
 
                        // -------------------------------------------------- //
 
                        struct xdg_surface* xdgSurfaceCreate(struct wl_surface*) noexcept;
                        void                xdgSurfaceDestroy(struct wl_surface*, struct xdg_surface*&) noexcept;
                        void                xdgSurfaceSetExtent(struct wl_surface*, const Yetani::SizeUnit&, const Yetani::SizeMm&, const Yetani::SizePercent&, const Yetani::SizePixel&) noexcept;
 
                        // }}}
                        // {{{ XDG : Toplevel
 
                        struct XdgToplevel
                        {
                                Yetani::VectorXdgStateChange* state_change         = nullptr;
                                Yetani::Lambda                close_request_lambda = {};
                                Yetani::LambdaBool            is_active_lambda     = {};
                                bool                          is_active            = false;
                                Yetani::XdgState              window_state         = XdgState::Unknown;
                                Yetani::LambdaWindowMode      window_state_lambda  = {};
                                Yetani::SizePixel             previous_size        = {};
                                struct xdg_toplevel*          xdg_toplevel         = nullptr;
                        };
 
                        using MapXdgToplevel = std::unordered_map<struct xdg_surface*, Yetani::XdgToplevel>;
 
                        MapXdgToplevel xdg_toplevel_map;
 
                        // -------------------------------------------------- //
 
                        struct xdg_toplevel* xdgToplevelCreate(struct xdg_surface*) noexcept;
                        void                 xdgToplevelDestroy(struct xdg_surface*, struct xdg_toplevel*&) noexcept;
                        static void          xdgToplevelSizeChange(Yetani*, struct wl_surface*, const Yetani::SizePixel&) noexcept;
                        static void          xdgToplevelSizeMinMaxChange(Yetani*, struct xdg_toplevel*, struct wl_surface*, const Yetani::SizePixel&, const Yetani::SizePixel&) noexcept;
                        static void          xdgToplevelWindowChange(Yetani*, struct wl_surface*, Yetani::XdgToplevel&, const Yetani::XdgState, const Yetani::SizePixel&) noexcept;
 
                        // }}}
                        // {{{ XDG : Decoration Manager (Unstable)
 
                        struct XdgDecoration
                        {
                                Yetani::VectorXdgStateChange*   state_change = nullptr;
                                Yetani::LambdaWindowDecorations lambda       = {};
                                uint32_t                        state        = 0;
                                bool                            is_present   = false;
                                //struct zxdg_toplevel_decoration_v1* xdg_decoration;
                        };
 
                        using MapXdgDecoration = std::unordered_map<struct xdg_surface*, Yetani::XdgDecoration>;
 
                        MapXdgDecoration xdg_decoration_map;
 
                        // -------------------------------------------------- //
 
                        struct zxdg_decoration_manager_v1* decoration_manager;
 
                        // -------------------------------------------------- //
 
                        struct zxdg_toplevel_decoration_v1* xdgDecorationCreate(struct xdg_surface*, struct xdg_toplevel*) noexcept;
                        void                                xdgDecorationDestroy(struct xdg_surface*, struct xdg_toplevel*, struct zxdg_toplevel_decoration_v1*&) noexcept;
                        static void                         xdgDecorationChange(Yetani::XdgDecoration&, const uint32_t) noexcept;
 
                        // }}}
                        // {{{ Listener Handlers : Wayland
 
                        static struct wl_buffer_listener   buffer_listener;
                        static struct wl_callback_listener frame_callback_listener;
                        static struct wl_keyboard_listener keyboard_listener;
                        static struct wl_output_listener   output_listener;
                        static struct wl_pointer_listener  pointer_listener;
                        static struct wl_registry_listener registry_listener;
                        static struct wl_seat_listener     seat_listener;
                        static struct wl_shm_listener      shm_listener;
                        static struct wl_surface_listener  surface_listener;
 
                        // -------------------------------------------------- //
 
                        static void handlerBufferRelease(void*, struct wl_buffer*) noexcept;
 
                        static void handlerKeyboardEnter(void*, struct wl_keyboard*, uint32_t, struct wl_surface*, struct wl_array*) noexcept;
                        static void handlerKeyboardKey(void*, struct wl_keyboard*, uint32_t, uint32_t, uint32_t, uint32_t) noexcept;
                        static void handlerKeyboardKeymap(void*, struct wl_keyboard*, uint32_t, int32_t, uint32_t) noexcept;
                        static void handlerKeyboardLeave(void*, struct wl_keyboard*, uint32_t, struct wl_surface*) noexcept;
                        static void handlerKeyboardModifiers(void*, struct wl_keyboard*, uint32_t, uint32_t, uint32_t, uint32_t, uint32_t) noexcept;
                        static void handlerKeyboardRepeatInfo(void*, struct wl_keyboard*, int32_t, int32_t) noexcept;
 
                        static void handlerOutputDone(void*, struct wl_output*) noexcept;
                        static void handlerOutputGeometry(void*, struct wl_output*, int32_t, int32_t, int32_t, int32_t, int32_t, const char*, const char*, int32_t) noexcept;
                        static void handlerOutputMode(void*, struct wl_output*, uint32_t, int32_t, int32_t, int32_t) noexcept;
                        static void handlerOutputScale(void*, struct wl_output*, int32_t) noexcept;
                        static void handlerPointerAxis(void*, struct wl_pointer*, uint32_t, uint32_t, wl_fixed_t) noexcept;
                        static void handlerPointerAxisDiscrete(void*, struct wl_pointer*, uint32_t, int32_t) noexcept;
                        static void handlerPointerAxisSource(void*, struct wl_pointer*, uint32_t) noexcept;
                        static void handlerPointerAxisStop(void*, struct wl_pointer*, uint32_t, uint32_t) noexcept;
                        static void handlerPointerButton(void*, struct wl_pointer*, uint32_t, uint32_t, uint32_t, uint32_t) noexcept;
                        static void handlerPointerEnter(void*, struct wl_pointer*, uint32_t, struct wl_surface*, wl_fixed_t, wl_fixed_t) noexcept;
                        static void handlerPointerFrame(void*, struct wl_pointer*) noexcept;
                        static void handlerPointerLeave(void*, struct wl_pointer*, uint32_t, struct wl_surface*) noexcept;
                        static void handlerPointerMotion(void*, struct wl_pointer*, uint32_t, wl_fixed_t, wl_fixed_t) noexcept;
                        static void handlerRegistryGlobal(void*, struct wl_registry*, uint32_t, const char*, uint32_t) noexcept;
                        static void handlerRegistryRemove(void*, struct wl_registry*, uint32_t) noexcept;
                        static void handlerSeatCapabilities(void*, struct wl_seat*, uint32_t) noexcept;
                        static void handlerSeatName(void*, struct wl_seat*, const char*) noexcept;
                        static void handlerShmFormat(void*, struct wl_shm*, uint32_t) noexcept;
                        static void handlerSurfaceEnter(void*, struct wl_surface*, struct wl_output*) noexcept;
                        static void handlerSurfaceLeave(void*, struct wl_surface*, struct wl_output*) noexcept;
                        static void handlerSwapBuffers(void*, struct wl_callback*, uint32_t) noexcept;
 
                        // }}}
                        // {{{ Listener Handlers : Wayland Unstable
                        // }}}
                        // {{{ Listener Handlers : XDG
 
                        static struct xdg_wm_base_listener  xdg_wm_base_listener;
                        static struct xdg_surface_listener  xdg_surface_listener;
                        static struct xdg_toplevel_listener xdg_toplevel_listener;
 
                        // -------------------------------------------------- //
 
                        static void handlerXdgSurfaceConfigure(void*, struct xdg_surface*, uint32_t) noexcept;
                        static void handlerXdgToplevelClose(void*, struct xdg_toplevel*) noexcept;
                        static void handlerXdgToplevelConfigure(void*, struct xdg_toplevel*, int32_t, int32_t, struct wl_array*) noexcept;
                        static void handlerXdgWmBasePing(void*, struct xdg_wm_base*, uint32_t) noexcept;
 
                        // }}}
                        // {{{ Listener Handlers : XDG Unstable
 
                        static struct zxdg_toplevel_decoration_v1_listener xdg_toplevel_decoration_listener;
 
                        // -------------------------------------------------- //
 
                        static void handlerXdgToplevelDecorationConfigure(void*, struct zxdg_toplevel_decoration_v1*, uint32_t mode) noexcept;
 
                        // }}}
 
                        Yetani(const Yetani&) = delete;
                        Yetani& operator=(const Yetani&) = delete;
        }; // class Yetani
 
        // }}}
        // {{{ Convenience
 
        std::string to_string(const wl_shm_format&) noexcept;
        std::string to_string(const std::error_code&) noexcept;
        std::string to_string(const Yetani::Key&) noexcept;
        std::string to_string(const Yetani::KeyModifier&) noexcept;
        std::string to_string(const Yetani::KeyState&) noexcept;
        std::string to_string(const Yetani::Output&) noexcept;
        std::string to_string(const Yetani::PointMm&) noexcept;
        std::string to_string(const Yetani::PointPercent&) noexcept;
        std::string to_string(const Yetani::PointPixel&) noexcept;
        std::string to_string(const Yetani::PointerAxis&) noexcept;
        std::string to_string(const Yetani::PointerAxisSource&) noexcept;
        std::string to_string(const Yetani::PointerAxisType&) noexcept;
        std::string to_string(const Yetani::PointerButtonState&) noexcept;
        std::string to_string(const Yetani::WindowMode&) noexcept;
 
        // }}}
}
 
// {{{ Implementation
 
#ifdef ZAKERO_YETANI_IMPLEMENTATION
 
// {{{ Macros
 
// {{{ Macros : Doxygen
 
#ifdef ZAKERO__DOXYGEN_DEFINE_DOCS
 
// Only used for generating Doxygen documentation
 
#define ZAKERO_YETANI_IMPLEMENTATION
 
#define ZAKERO_YETANI_ENABLE_DEBUG
 
#define ZAKERO_YETANI_ENABLE_SAFE_MODE
 
#endif // ZAKERO__DOXYGEN_DEFINE_DOCS
 
// }}}
 
#ifdef ZAKERO_YETANI_ENABLE_DEBUG
#define ZAKERO_YETANI__DEBUG_DISABLED false
#else
#define ZAKERO_YETANI__DEBUG_DISABLED true
#endif
 
 
#ifndef ZAKERO_YETANI_ENABLE_DEBUG_STREAM
#define ZAKERO_YETANI_ENABLE_DEBUG_STREAM std::cerr
#endif
 
 
#define ZAKERO_YETANI__DEBUG                   \
        if(ZAKERO_YETANI__DEBUG_DISABLED) {}   \
        else ZAKERO_YETANI_ENABLE_DEBUG_STREAM \
                << __FILE__"("                 \
                << std::to_string(__LINE__)    \
                << ") "                        \
                << __PRETTY_FUNCTION__         \
                << " "
 
#define ZAKERO_YETANI__DEBUG_VAR(var_)   \
        ZAKERO_YETANI__DEBUG             \
                << #var_ << ": " << var_ \
                << "\n";
 
#define ZAKERO_YETANI__DEBUG_BOOL(var_)                    \
        ZAKERO_YETANI__DEBUG                               \
                << #var_ << ": " << std::boolalpha << var_ \
                << "\n";
 
#define ZAKERO_YETANI__ERROR(err_) std::error_code(err_, YetaniErrorCategory)
 
 
#define ZAKERO_YETANI__SHM_FORMAT \
        X(WL_SHM_FORMAT_ARGB8888        , 4 , "32-bit ARGB format, [31:0] A:R:G:B 8:8:8:8 little endian"                                          ) \
        X(WL_SHM_FORMAT_XRGB8888        , 4 , "32-bit RGB format, [31:0] x:R:G:B 8:8:8:8 little endian"                                           ) \
        X(WL_SHM_FORMAT_C8              , 1 , "8-bit color index format, [7:0] C"                                                                 ) \
        X(WL_SHM_FORMAT_RGB332          , 1 , "8-bit RGB format, [7:0] R:G:B 3:3:2"                                                               ) \
        X(WL_SHM_FORMAT_BGR233          , 1 , "8-bit BGR format, [7:0] B:G:R 2:3:3"                                                               ) \
        X(WL_SHM_FORMAT_XRGB4444        , 2 , "16-bit xRGB format, [15:0] x:R:G:B 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_XBGR4444        , 2 , "16-bit xBGR format, [15:0] x:B:G:R 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_RGBX4444        , 2 , "16-bit RGBx format, [15:0] R:G:B:x 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_BGRX4444        , 2 , "16-bit BGRx format, [15:0] B:G:R:x 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_ARGB4444        , 2 , "16-bit ARGB format, [15:0] A:R:G:B 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_ABGR4444        , 2 , "16-bit ABGR format, [15:0] A:B:G:R 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_RGBA4444        , 2 , "16-bit RBGA format, [15:0] R:G:B:A 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_BGRA4444        , 2 , "16-bit BGRA format, [15:0] B:G:R:A 4:4:4:4 little endian"                                          ) \
        X(WL_SHM_FORMAT_XRGB1555        , 2 , "16-bit xRGB format, [15:0] x:R:G:B 1:5:5:5 little endian"                                          ) \
        X(WL_SHM_FORMAT_XBGR1555        , 2 , "16-bit xBGR 1555 format, [15:0] x:B:G:R 1:5:5:5 little endian"                                     ) \
        X(WL_SHM_FORMAT_RGBX5551        , 2 , "16-bit RGBx 5551 format, [15:0] R:G:B:x 5:5:5:1 little endian"                                     ) \
        X(WL_SHM_FORMAT_BGRX5551        , 2 , "16-bit BGRx 5551 format, [15:0] B:G:R:x 5:5:5:1 little endian"                                     ) \
        X(WL_SHM_FORMAT_ARGB1555        , 2 , "16-bit ARGB 1555 format, [15:0] A:R:G:B 1:5:5:5 little endian"                                     ) \
        X(WL_SHM_FORMAT_ABGR1555        , 2 , "16-bit ABGR 1555 format, [15:0] A:B:G:R 1:5:5:5 little endian"                                     ) \
        X(WL_SHM_FORMAT_RGBA5551        , 2 , "16-bit RGBA 5551 format, [15:0] R:G:B:A 5:5:5:1 little endian"                                     ) \
        X(WL_SHM_FORMAT_BGRA5551        , 2 , "16-bit BGRA 5551 format, [15:0] B:G:R:A 5:5:5:1 little endian"                                     ) \
        X(WL_SHM_FORMAT_RGB565          , 2 , "16-bit RGB 565 format, [15:0] R:G:B 5:6:5 little endian"                                           ) \
        X(WL_SHM_FORMAT_BGR565          , 2 , "16-bit BGR 565 format, [15:0] B:G:R 5:6:5 little endian"                                           ) \
        X(WL_SHM_FORMAT_RGB888          , 3 , "24-bit RGB format, [23:0] R:G:B little endian"                                                     ) \
        X(WL_SHM_FORMAT_BGR888          , 3 , "24-bit BGR format, [23:0] B:G:R little endian"                                                     ) \
        X(WL_SHM_FORMAT_XBGR8888        , 4 , "32-bit xBGR format, [31:0] x:B:G:R 8:8:8:8 little endian"                                          ) \
        X(WL_SHM_FORMAT_RGBX8888        , 4 , "32-bit RGBx format, [31:0] R:G:B:x 8:8:8:8 little endian"                                          ) \
        X(WL_SHM_FORMAT_BGRX8888        , 4 , "32-bit BGRx format, [31:0] B:G:R:x 8:8:8:8 little endian"                                          ) \
        X(WL_SHM_FORMAT_ABGR8888        , 4 , "32-bit ABGR format, [31:0] A:B:G:R 8:8:8:8 little endian"                                          ) \
        X(WL_SHM_FORMAT_RGBA8888        , 4 , "32-bit RGBA format, [31:0] R:G:B:A 8:8:8:8 little endian"                                          ) \
        X(WL_SHM_FORMAT_BGRA8888        , 4 , "32-bit BGRA format, [31:0] B:G:R:A 8:8:8:8 little endian"                                          ) \
        X(WL_SHM_FORMAT_XRGB2101010     , 4 , "32-bit xRGB format, [31:0] x:R:G:B 2:10:10:10 little endian"                                       ) \
        X(WL_SHM_FORMAT_XBGR2101010     , 4 , "32-bit xBGR format, [31:0] x:B:G:R 2:10:10:10 little endian"                                       ) \
        X(WL_SHM_FORMAT_RGBX1010102     , 4 , "32-bit RGBx format, [31:0] R:G:B:x 10:10:10:2 little endian"                                       ) \
        X(WL_SHM_FORMAT_BGRX1010102     , 4 , "32-bit BGRx format, [31:0] B:G:R:x 10:10:10:2 little endian"                                       ) \
        X(WL_SHM_FORMAT_ARGB2101010     , 4 , "32-bit ARGB format, [31:0] A:R:G:B 2:10:10:10 little endian"                                       ) \
        X(WL_SHM_FORMAT_ABGR2101010     , 4 , "32-bit ABGR format, [31:0] A:B:G:R 2:10:10:10 little endian"                                       ) \
        X(WL_SHM_FORMAT_RGBA1010102     , 4 , "32-bit RGBA format, [31:0] R:G:B:A 10:10:10:2 little endian"                                       ) \
        X(WL_SHM_FORMAT_BGRA1010102     , 4 , "32-bit BGRA format, [31:0] B:G:R:A 10:10:10:2 little endian"                                       ) \
        X(WL_SHM_FORMAT_YUYV            , 4 , "packed YCbCr format, [31:0] Cr0:Y1:Cb0:Y0 8:8:8:8 little endian"                                   ) \
        X(WL_SHM_FORMAT_YVYU            , 4 , "packed YCbCr format, [31:0] Cb0:Y1:Cr0:Y0 8:8:8:8 little endian"                                   ) \
        X(WL_SHM_FORMAT_UYVY            , 4 , "packed YCbCr format, [31:0] Y1:Cr0:Y0:Cb0 8:8:8:8 little endian"                                   ) \
        X(WL_SHM_FORMAT_VYUY            , 4 , "packed YCbCr format, [31:0] Y1:Cb0:Y0:Cr0 8:8:8:8 little endian"                                   ) \
        X(WL_SHM_FORMAT_AYUV            , 4 , "packed AYCbCr format, [31:0] A:Y:Cb:Cr 8:8:8:8 little endian"                                      ) \
        X(WL_SHM_FORMAT_NV12            , 8 , "2 plane YCbCr Cr:Cb format, 2x2 subsampled Cr:Cb plane"                                            ) \
        X(WL_SHM_FORMAT_NV21            , 8 , "2 plane YCbCr Cb:Cr format, 2x2 subsampled Cb:Cr plane"                                            ) \
        X(WL_SHM_FORMAT_NV16            , 8 , "2 plane YCbCr Cr:Cb format, 2x1 subsampled Cr:Cb plane"                                            ) \
        X(WL_SHM_FORMAT_NV61            , 8 , "2 plane YCbCr Cb:Cr format, 2x1 subsampled Cb:Cr plane"                                            ) \
        X(WL_SHM_FORMAT_YUV410          , 8 , "3 plane YCbCr format, 4x4 subsampled Cb (1) and Cr (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YVU410          , 8 , "3 plane YCbCr format, 4x4 subsampled Cr (1) and Cb (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YUV411          , 8 , "3 plane YCbCr format, 4x1 subsampled Cb (1) and Cr (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YVU411          , 8 , "3 plane YCbCr format, 4x1 subsampled Cr (1) and Cb (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YUV420          , 8 , "3 plane YCbCr format, 2x2 subsampled Cb (1) and Cr (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YVU420          , 8 , "3 plane YCbCr format, 2x2 subsampled Cr (1) and Cb (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YUV422          , 8 , "3 plane YCbCr format, 2x1 subsampled Cb (1) and Cr (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YVU422          , 8 , "3 plane YCbCr format, 2x1 subsampled Cr (1) and Cb (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YUV444          , 8 , "3 plane YCbCr format, non-subsampled Cb (1) and Cr (2) planes"                                     ) \
        X(WL_SHM_FORMAT_YVU444          , 8 , "3 plane YCbCr format, non-subsampled Cr (1) and Cb (2) planes"                                     ) \
        X(WL_SHM_FORMAT_R8              , 1 , "[7:0] R"                                                                                           ) \
        X(WL_SHM_FORMAT_R16             , 2 , "[15:0] R little endian"                                                                            ) \
        X(WL_SHM_FORMAT_RG88            , 2 , "[15:0] R:G 8:8 little endian"                                                                      ) \
        X(WL_SHM_FORMAT_GR88            , 2 , "[15:0] G:R 8:8 little endian"                                                                      ) \
        X(WL_SHM_FORMAT_RG1616          , 4 , "[31:0] R:G 16:16 little endian"                                                                    ) \
        X(WL_SHM_FORMAT_GR1616          , 4 , "[31:0] G:R 16:16 little endian"                                                                    ) \
        X(WL_SHM_FORMAT_XRGB16161616F   , 8 , "[63:0] x:R:G:B 16:16:16:16 little endian"                                                          ) \
        X(WL_SHM_FORMAT_XBGR16161616F   , 8 , "[63:0] x:B:G:R 16:16:16:16 little endian"                                                          ) \
        X(WL_SHM_FORMAT_ARGB16161616F   , 8 , "[63:0] A:R:G:B 16:16:16:16 little endian"                                                          ) \
        X(WL_SHM_FORMAT_ABGR16161616F   , 8 , "[63:0] A:B:G:R 16:16:16:16 little endian"                                                          ) \
        X(WL_SHM_FORMAT_XYUV8888        , 4 , "[31:0] X:Y:Cb:Cr 8:8:8:8 little endian"                                                            ) \
        X(WL_SHM_FORMAT_VUY888          , 3 , "[23:0] Cr:Cb:Y 8:8:8 little endian"                                                                ) \
        X(WL_SHM_FORMAT_VUY101010       , 4 , "Y followed by U then V, 10:10:10. Non-linear modifier only"                                        ) \
        X(WL_SHM_FORMAT_Y210            , 8 , "[63:0] Cr0:0:Y1:0:Cb0:0:Y0:0 10:6:10:6:10:6:10:6 little endian per 2 Y pixels"                     ) \
        X(WL_SHM_FORMAT_Y212            , 8 , "[63:0] Cr0:0:Y1:0:Cb0:0:Y0:0 12:4:12:4:12:4:12:4 little endian per 2 Y pixels"                     ) \
        X(WL_SHM_FORMAT_Y216            , 8 , "[63:0] Cr0:Y1:Cb0:Y0 16:16:16:16 little endian per 2 Y pixels"                                     ) \
        X(WL_SHM_FORMAT_Y410            , 4 , "[31:0] A:Cr:Y:Cb 2:10:10:10 little endian"                                                         ) \
        X(WL_SHM_FORMAT_Y412            , 8 , "[63:0] A:0:Cr:0:Y:0:Cb:0 12:4:12:4:12:4:12:4 little endian"                                        ) \
        X(WL_SHM_FORMAT_Y416            , 8 , "[63:0] A:Cr:Y:Cb 16:16:16:16 little endian"                                                        ) \
        X(WL_SHM_FORMAT_XVYU2101010     , 4 , "[31:0] X:Cr:Y:Cb 2:10:10:10 little endian"                                                         ) \
        X(WL_SHM_FORMAT_XVYU12_16161616 , 8 , "[63:0] X:0:Cr:0:Y:0:Cb:0 12:4:12:4:12:4:12:4 little endian"                                        ) \
        X(WL_SHM_FORMAT_XVYU16161616    , 8 , "[63:0] X:Cr:Y:Cb 16:16:16:16 little endian"                                                        ) \
        X(WL_SHM_FORMAT_Y0L0            , 8 , "[63:0] A3:A2:Y3:0:Cr0:0:Y2:0:A1:A0:Y1:0:Cb0:0:Y0:0  1:1:8:2:8:2:8:2:1:1:8:2:8:2:8:2 little endian" ) \
        X(WL_SHM_FORMAT_X0L0            , 8 , "[63:0] X3:X2:Y3:0:Cr0:0:Y2:0:X1:X0:Y1:0:Cb0:0:Y0:0  1:1:8:2:8:2:8:2:1:1:8:2:8:2:8:2 little endian" ) \
        X(WL_SHM_FORMAT_Y0L2            , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_X0L2            , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_YUV420_8BIT     , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_YUV420_10BIT    , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_XRGB8888_A8     , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_XBGR8888_A8     , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_RGBX8888_A8     , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_BGRX8888_A8     , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_RGB888_A8       , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_BGR888_A8       , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_RGB565_A8       , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_BGR565_A8       , 8 , "[63:0] X3:X2:Y3:Cr0:Y2:X1:X0:Y1:Cb0:Y0  1:1:10:10:10:1:1:10:10:10 little endian"                   ) \
        X(WL_SHM_FORMAT_NV24            , 0 , "[UNKNOWN SIZE] non-subsampled Cr:Cb plane"                                                         ) \
        X(WL_SHM_FORMAT_NV42            , 0 , "[UNKNOWN SIZE] non-subsampled Cb:Cr plane"                                                         ) \
        X(WL_SHM_FORMAT_P210            , 0 , "[UNKNOWN SIZE] 2x1 subsampled Cr:Cb plane, 10 bits per channel"                                    ) \
        X(WL_SHM_FORMAT_P010            , 0 , "[UNKNOWN SIZE] 2x2 subsampled Cr:Cb plane, 10 bits per channel"                                    ) \
        X(WL_SHM_FORMAT_P012            , 0 , "[UNKNOWN SIZE] 2x2 subsampled Cr:Cb plane, 12 bits per channel"                                    ) \
        X(WL_SHM_FORMAT_P016            , 0 , "[UNKNOWN SIZE] 2x2 subsampled Cr:Cb plane, 16 bits per channel"                                    ) \
 
 
#define ZAKERO_YETANI__OUTPUT_SUBPIXEL \
        X(WL_OUTPUT_SUBPIXEL_UNKNOWN        , "Unkown Subpixel Format" ) \
        X(WL_OUTPUT_SUBPIXEL_NONE           , "No Subpixels"           ) \
        X(WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB , "Horizontal RGB"         ) \
        X(WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR , "Horizontal BGR"         ) \
        X(WL_OUTPUT_SUBPIXEL_VERTICAL_RGB   , "Vertical RGB"           ) \
        X(WL_OUTPUT_SUBPIXEL_VERTICAL_BGR   , "Vertical BGR"           ) \
 
 
#define ZAKERO_YETANI__OUTPUT_TRANSFORM \
        X(WL_OUTPUT_TRANSFORM_NORMAL      , "No Transform"                                  ) \
        X(WL_OUTPUT_TRANSFORM_90          , "90 degrees Counter-Clockwise"                  ) \
        X(WL_OUTPUT_TRANSFORM_180         , "180 degrees Counter-Clockwise"                 ) \
        X(WL_OUTPUT_TRANSFORM_270         , "270 degrees Counter-Clockwise"                 ) \
        X(WL_OUTPUT_TRANSFORM_FLIPPED     , "180 degree flip around a vertical axis"        ) \
        X(WL_OUTPUT_TRANSFORM_FLIPPED_90  , "Flig and rotate 90 degrees counter-clockwise"  ) \
        X(WL_OUTPUT_TRANSFORM_FLIPPED_180 , "Flig and rotate 180 degrees counter-clockwise" ) \
 
 
#define ZAKERO_YETANI__ARRAY_FOR_EACH(type_, pos_, array_)                                   \
        for(type_ pos_ = (type_)(array_)->data                                       \
                ; (const char*)pos_ < ((const char*)(array_)->data + (array_)->size) \
                ; (pos_)++                                                           \
                )
 
// }}}
 
namespace zakero
{
// {{{ Anonymous Namespace
 
namespace
{
        // {{{ Cursor Names (Not used yet)
        /*
         * \brief Common cursor names
         *
         * These were found in:
         * - gdkcursor-wayland.c
         * - /usr/share/icons/whiteglass/cursors
        const std::array<const char*, 131> common_cursor_names =
        {       "X_cursor"
        ,       "alias"
        ,       "all-scroll"
        ,       "arrow"
        ,       "base_arrow_down"
        ,       "base_arrow_up"
        ,       "bd_double_arrow"
        ,       "boat"
        ,       "bottom_left_corner"
        ,       "bottom_right_corner"
        ,       "bottom_side"
        ,       "bottom_tee"
        ,       "cell"
        ,       "center_ptr"
        ,       "circle"
        ,       "closedhand"
        ,       "col-resize"
        ,       "color-picker"
        ,       "context-menu"
        ,       "copy"
        ,       "cross"
        ,       "cross_reverse"
        ,       "crossed_circle"
        ,       "crosshair"
        ,       "default"
        ,       "dnd-copy"
        ,       "dnd-link"
        ,       "dnd-move"
        ,       "dnd-no-drop"
        ,       "dnd-none"
        ,       "dot"
        ,       "dot_box_mask"
        ,       "double_arrow"
        ,       "down-arrow"
        ,       "draft"
        ,       "draft_large"
        ,       "draft_small"
        ,       "draped_box"
        ,       "e-resize"
        ,       "ew-resize"
        ,       "exchange"
        ,       "fd_double_arrow"
        ,       "fleur"
        ,       "forbidden"
        ,       "grab"
        ,       "grabbing"
        ,       "gumby"
        ,       "h_double_arrow"
        ,       "half-busy"
        ,       "hand"
        ,       "hand1"
        ,       "hand2"
        ,       "help"
        ,       "ibeam"
        ,       "left-arrow"
        ,       "left_ptr"
        ,       "left_ptr_help"
        ,       "left_ptr_watch"
        ,       "left_side"
        ,       "left_tee"
        ,       "link"
        ,       "ll_angle"
        ,       "lr_angle"
        ,       "move"
        ,       "n-resize"
        ,       "ne-resize"
        ,       "nesw-resize"
        ,       "no-drop"
        ,       "not-allowed"
        ,       "ns-resize"
        ,       "nw-resize"
        ,       "nwse-resize"
        ,       "openhand"
        ,       "pencil"
        ,       "pirate"
        ,       "plus"
        ,       "pointer"
        ,       "pointing_hand"
        ,       "progress"
        ,       "question_arrow"
        ,       "right-arrow"
        ,       "right_ptr"
        ,       "right_side"
        ,       "right_tee"
        ,       "row-resize"
        ,       "s-resize"
        ,       "sailboat"
        ,       "sb_down_arrow"
        ,       "sb_h_double_arrow"
        ,       "sb_left_arrow"
        ,       "sb_right_arrow"
        ,       "sb_up_arrow"
        ,       "sb_v_double_arrow"
        ,       "se-resize"
        ,       "shuttle"
        ,       "size-bdiag"
        ,       "size-fdiag"
        ,       "size-hor"
        ,       "size-ver"
        ,       "size_all"
        ,       "size_bdiag"
        ,       "size_fdiag"
        ,       "size_hor"
        ,       "size_ver"
        ,       "sizing"
        ,       "split_h"
        ,       "split_v"
        ,       "sw-resize"
        ,       "target"
        ,       "tcross"
        ,       "text"
        ,       "top_left_arrow"
        ,       "top_left_corner"
        ,       "top_right_corner"
        ,       "top_side"
        ,       "top_tee"
        ,       "trek"
        ,       "ul_angle"
        ,       "up-arrow"
        ,       "ur_angle"
        ,       "v_double_arrow"
        ,       "vertical-text"
        ,       "w-resize"
        ,       "wait"
        ,       "watch"
        ,       "wayland-cursor"
        ,       "whats_this"
        ,       "x-cursor"
        ,       "xterm"
        ,       "zoom-in"
        ,       "zoom-out"
        };
         */
        // }}}
 
        class YetaniErrorCategory_
                : public std::error_category
        {
                public:
                        constexpr YetaniErrorCategory_() noexcept
                        {
                        }
 
                        const char* name() const noexcept override
                        {
                                return "zakero.Yetani";
                        }
 
                        std::string message(int condition
                                ) const noexcept override
                        {
                                switch(condition)
                                {
#define X(name_, val_, mesg_) \
                                        case val_: return mesg_;
                                        ZAKERO_YETANI__ERROR_DATA
#undef X
                                }
 
                                return "Unknown error condition";
                        }
        } YetaniErrorCategory;
 
 
        Yetani::Lambda                  Lambda_DoNothing                  = []() noexcept {};
        Yetani::LambdaKey               LambdaKey_DoNothing               = [](const Yetani::Key&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaAxis              LambdaAxis_DoNothing              = [](const Yetani::PointerAxis&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaButtonMm          LambdaButtonMm_DoNothing          = [](const Yetani::PointerButton&, const Yetani::PointMm&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaButtonPercent     LambdaButtonPercent_DoNothing     = [](const Yetani::PointerButton&, const Yetani::PointPercent&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaButtonPixel       LambdaButtonPixel_DoNothing       = [](const Yetani::PointerButton&, const Yetani::PointPixel&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaPointMm           LambdaPointMm_DoNothing           = [](const Yetani::PointMm&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaPointPercent      LambdaPointPercent_DoNothing      = [](const Yetani::PointPercent&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaPointPixel        LambdaPointPixel_DoNothing        = [](const Yetani::PointPixel&, const Yetani::KeyModifier&) noexcept {};
        Yetani::LambdaBool              LambdaBool_DoNothing              = [](const bool) noexcept {};
        Yetani::LambdaOutputId          LambdaOutputId_DoNothing          = [](const Yetani::OutputId) noexcept {};
        Yetani::LambdaWindowDecorations LambdaWindowDecorations_DoNothing = [](const Yetani::WindowDecorations) noexcept {};
        Yetani::LambdaWindowMode        LambdaWindowMode_DoNothing        = [](const Yetani::WindowMode) noexcept {};
        Yetani::LambdaSizeMm            LambdaSizeMm_DoNothing            = [](const Yetani::SizeMm&) noexcept {};
        Yetani::LambdaSizePercent       LambdaSizePercent_DoNothing       = [](const Yetani::SizePercent&) noexcept {};
        Yetani::LambdaSizePixel         LambdaSizePixel_DoNothing         = [](const Yetani::SizePixel&) noexcept {};
        inline size_t sizeInBytes(const Yetani::SizePixel& size   
                , const wl_shm_format                      format 
                ) noexcept
        {
                return size.width
                        * size.height
                        * Yetani::shmFormatBytesPerPixel(format)
                        ;
        }
 
 
        template<class Type 
                >
        std::error_code validateMinMax(const Type& min 
                , const Type&                      max 
                ) noexcept
        {
                if((min.width < 0)
                        || (min.height < 0)
                        || (max.width < 0)
                        || (max.height < 0)
                        )
                {
                        return ZAKERO_YETANI__ERROR(Yetani::Error_Window_Size_Too_Small);
                }
 
                if((min.width > 0)
                        && (max.width > 0)
                        && (min.width > max.width)
                        )
                {
                        return ZAKERO_YETANI__ERROR(Yetani::Error_Minimum_Size_Greater_Than_Maximum_Size);
                }
 
                if((min.height > 0)
                        && (max.height > 0)
                        && (min.height > max.height)
                        )
                {
                        return ZAKERO_YETANI__ERROR(Yetani::Error_Minimum_Size_Greater_Than_Maximum_Size);
                }
 
                return ZAKERO_YETANI__ERROR(Yetani::Error_None);
        }
}
 
// }}}
// {{{ Documentation
 
/* Disabled because Doxygen does not support "enum classes"
 *
 * \var Yetani::Released
 * \brief The key was released
 *
 * \var Yetani::Pressed
 * \brief The key was pressed
 *
 * \var Yetani::Repeat
 * \brief The key is being held down
 */
 
/* Disabled because Doxygen does not support "enum classes"
 *
 * \var Yetani::Unknown
 * \brief Unknown
 *
 * \var Yetani::Continuous
 * \brief Continuous
 *
 * \var Yetani::Finger
 * \brief Finger
 *
 * \var Yetani::Wheel
 * \brief Wheel
 *
 * \var Yetani::Wheel_Tilt
 * \brief Wheel Tilt
 */
 
/* Disabled because Doxygen does not support "enum classes"
 *
 * \var Yetani::Unknown
 * \brief Unknown
 *
 * \var Yetani::Horizontal
 * \brief Horizontal
 *
 * \var Yetani::Vertical
 * \brief Vertical
 */
 
/* Disabled because Doxygen does not support "enum classes"
 *
 * \var Yetani::Released
 * \brief Released
 *
 * \var Yetani::Pressed
 * \brief Pressed
 */
 
// }}}
// {{{ Static Member Initialization
// {{{ Listener Handler : Wayland
 
struct wl_buffer_listener Yetani::buffer_listener =
{       .release = &Yetani::handlerBufferRelease
};
 
struct wl_callback_listener Yetani::frame_callback_listener =
{       .done = &Yetani::handlerSwapBuffers
};
 
struct wl_keyboard_listener Yetani::keyboard_listener =
{       .keymap      = &Yetani::handlerKeyboardKeymap
,       .enter       = &Yetani::handlerKeyboardEnter
,       .leave       = &Yetani::handlerKeyboardLeave
,       .key         = &Yetani::handlerKeyboardKey
,       .modifiers   = &Yetani::handlerKeyboardModifiers
,       .repeat_info = &Yetani::handlerKeyboardRepeatInfo
};
 
struct wl_output_listener Yetani::output_listener =
{       .geometry = &Yetani::handlerOutputGeometry
,       .mode     = &Yetani::handlerOutputMode
,       .done     = &Yetani::handlerOutputDone
,       .scale    = &Yetani::handlerOutputScale
};
 
struct wl_pointer_listener Yetani::pointer_listener =
{       .enter         = &Yetani::handlerPointerEnter
,       .leave         = &Yetani::handlerPointerLeave
,       .motion        = &Yetani::handlerPointerMotion
,       .button        = &Yetani::handlerPointerButton
,       .axis          = &Yetani::handlerPointerAxis
,       .frame         = &Yetani::handlerPointerFrame
,       .axis_source   = &Yetani::handlerPointerAxisSource
,       .axis_stop     = &Yetani::handlerPointerAxisStop
,       .axis_discrete = &Yetani::handlerPointerAxisDiscrete
};
 
struct wl_registry_listener Yetani::registry_listener =
{       .global        = &Yetani::handlerRegistryGlobal
,       .global_remove = &Yetani::handlerRegistryRemove
};
 
struct wl_seat_listener Yetani::seat_listener =
{       .capabilities = &Yetani::handlerSeatCapabilities
,       .name         = &Yetani::handlerSeatName
};
 
struct wl_shm_listener Yetani::shm_listener =
{       .format = &Yetani::handlerShmFormat
};
 
struct wl_surface_listener  Yetani::surface_listener =
{       .enter = &Yetani::handlerSurfaceEnter
,       .leave = &Yetani::handlerSurfaceLeave
};
 
// }}}
// {{{ Listener Handler : Wayland Unstable
// }}}
// {{{ Listener Handler : XDG
 
struct xdg_wm_base_listener Yetani::xdg_wm_base_listener =
{       .ping = &Yetani::handlerXdgWmBasePing
};
 
struct xdg_surface_listener Yetani::xdg_surface_listener =
{       .configure = &Yetani::handlerXdgSurfaceConfigure
};
 
struct xdg_toplevel_listener Yetani::xdg_toplevel_listener =
{       .configure = &Yetani::handlerXdgToplevelConfigure
,       .close     = &Yetani::handlerXdgToplevelClose
};
 
// }}}
// {{{ Listener Handler : XDG Unstable
 
struct zxdg_toplevel_decoration_v1_listener Yetani::xdg_toplevel_decoration_listener =
{       .configure = &Yetani::handlerXdgToplevelDecorationConfigure
};
 
// }}}
// }}}
// {{{ Constructor / Destructor
 
Yetani::Yetani() noexcept
        : cursor_map()
        , cursor_surface_map()
        , cursor_memory_pool(
                std::string("Zakero.Yetani.")
                + std::to_string(ZAKERO_STEADY_TIME_NOW(nanoseconds))
                )
        , cursor_mutex()
        , cursor_shm_pool(nullptr)
        , cursor_pointer(nullptr)
        , event_loop()
        , event_loop_is_running(false)
        , compositor(nullptr)
        , display(nullptr)
        , registry(nullptr)
        , shm(nullptr)
        , shm_format_vector()
        , seat_map()
        , id_to_seat()
        , seat(nullptr)
        , keyboard()
        , pointer()
        , output_data()
        , on_output_add(LambdaOutputId_DoNothing)
        , on_output_change(LambdaOutputId_DoNothing)
        , on_output_remove(LambdaOutputId_DoNothing)
        , output_changes_map()
        , output_state_map()
        , output_notify_surface_vector()
        , buffer()
        , surface_event_map()
        , surface_extent_map()
        , surface_extent_mutex()
        , surface_frame_map()
        , surface_size_map()
        , surface_resize_mutex_map()
        , window_vector()
        , window_vector_mutex()
        , xdg_state_change_map()
        , xdg_state_change_mutex()
        , xdg_wm_base(nullptr)
        , xdg_surface_map()
        , xdg_toplevel_map()
        , xdg_decoration_map()
        , decoration_manager(nullptr)
{
}
 
 
Yetani::~Yetani() noexcept
{
        if(event_loop_is_running || event_loop.joinable())
        {
                event_loop.request_stop();
                event_loop.join();
        }
 
        disconnect();
}
 
// }}}
// {{{ Connection
 
Yetani* Yetani::connect() noexcept
{
        std::error_code error; 
 
        return Yetani::connect("", error);
}
 
 
Yetani* Yetani::connect(const std::string& display 
        ) noexcept
{
        std::error_code error; 
 
        return Yetani::connect(display, error);
}
 
 
Yetani* Yetani::connect(std::error_code& error 
        ) noexcept
{
        return Yetani::connect("", error);
}
 
Yetani* Yetani::connect(const std::string& display 
        , std::error_code&                 error   
        ) noexcept
{
        Yetani* yetani = new Yetani();
 
        const char* display_name = nullptr;
 
        if(display.empty() == false)
        {
                display_name = display.c_str();
        }
 
        // --- Get the Display --- //
        yetani->display = wl_display_connect(display_name);
        if(yetani->display == nullptr)
        {
                delete yetani;
 
                const char* session = getenv("XDG_SESSION_TYPE");
 
                if(session != nullptr
                        && strcasecmp(session, "wayland") != 0
                        )
                {
                        error = ZAKERO_YETANI__ERROR(Error_Wayland_Not_Available);
                }
                else if(display.empty())
                {
                        error = ZAKERO_YETANI__ERROR(Error_Connection_Failed);
                }
                else
                {
                        error = ZAKERO_YETANI__ERROR(Error_Invalid_Display_Name);
                }
 
                return nullptr;
        }
 
        // --- Get the Registry --- //
        yetani->registry = wl_display_get_registry(yetani->display);
        if(yetani->registry == nullptr)
        {
                delete yetani;
 
                error = ZAKERO_YETANI__ERROR(Error_Registry_Not_Available);
 
                return nullptr;
        }
 
        wl_registry_add_listener(yetani->registry, &registry_listener, yetani);
 
        // --- Wait for all Global Objects to be registered --- //
        wl_display_dispatch(yetani->display);
        wl_display_roundtrip(yetani->display);
 
        // --- Validate required Global Objects --- //
        if(yetani->compositor == nullptr)
        {
                delete yetani;
 
                error = ZAKERO_YETANI__ERROR(Error_Compositor_Was_Not_Found);
 
                return nullptr;
        }
 
        if(yetani->shm == nullptr)
        {
                delete yetani;
 
                error = ZAKERO_YETANI__ERROR(Error_Shm_Was_Not_Found);
 
                return nullptr;
        }
 
        if(yetani->xdg_wm_base == nullptr)
        {
                delete yetani;
 
                error = ZAKERO_YETANI__ERROR(Error_Xdg_WM_Base_Was_Not_Found);
 
                return nullptr;
        }
 
        yetani->cursorSetup();
 
        yetani->eventLoopStart();
 
        error = ZAKERO_YETANI__ERROR(Error_None);
 
        return yetani;
}
 
 
void Yetani::disconnect() noexcept
{
        cursorTeardown();
 
        if(decoration_manager != nullptr)
        {
                zxdg_decoration_manager_v1_destroy(decoration_manager);
                decoration_manager = nullptr;
        }
 
        if(xdg_wm_base != nullptr)
        {
                xdg_wm_base_destroy(xdg_wm_base);
                xdg_wm_base = nullptr;
        }
 
        if(shm != nullptr)
        {
                wl_shm_destroy(shm);
                shm = nullptr;
        }
 
        // Seat
        id_to_seat.clear();
 
        while(seat_map.empty() == false)
        {
                auto iter = std::begin(seat_map);
 
                struct wl_seat* wl_seat = iter->first;
 
                seatDestroy(wl_seat);
        }
 
        // Wayland Output Devices
        {
                std::lock_guard<std::mutex> lock(output_data.mutex);
 
                for(auto& iter : output_data.output_map)
                {
                        struct wl_output* wayland_output = iter.first;
 
                        wl_output_destroy(wayland_output);
                }
 
                output_changes_map.clear();
                output_state_map.clear();
                output_data.output_map.clear();
                output_data.wloutput_to_outputid.clear();
                output_data.outputid_to_wloutput.clear();
        }
 
        if(registry != nullptr)
        {
                wl_registry_destroy(registry);
                registry = nullptr;
        }
 
        if(compositor != nullptr)
        {
                wl_compositor_destroy(compositor);
                compositor = nullptr;
        }
 
        if(display != nullptr)
        {
                wl_display_disconnect(display);
                display = nullptr;
        }
 
        return;
}
 
// }}}
// {{{ Cursor
 
void Yetani::cursorAnimate() noexcept
{
        int64_t time_now = ZAKERO_STEADY_TIME_NOW(milliseconds);
 
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        for(auto& iter : cursor_map)
        {
                Yetani::Cursor& cursor = iter.second;
 
                if(cursor.next_frame_time <= time_now)
                {
                        const int64_t time_over = time_now - cursor.next_frame_time;
                        cursor.next_frame_time = time_now + cursor.time_per_frame - time_over;
 
                        cursor.buffer_index = (cursor.buffer_index + 1) % cursor.buffer_vector.size();
 
                        wl_surface_attach(cursor.wl_surface, cursor.buffer_vector[cursor.buffer_index], 0, 0);
                        wl_surface_damage(cursor.wl_surface
                                , 0, 0
                                , cursor.width, cursor.height
                                );
 
                        wl_surface_commit(cursor.wl_surface);
                }
        }
}
 
 
std::error_code Yetani::cursorCreate(const std::string& name   
        , const Yetani::CursorConfig&                   config 
        ) noexcept
{
        if(name.empty())
        {
                return ZAKERO_YETANI__ERROR(Error_Cursor_Name_Is_Invalid);
        }
 
        if(cursor_map.contains(name) == true)
        {
                return ZAKERO_YETANI__ERROR(Error_Cursor_Already_Exists);
        }
 
        if(config.size.width <= 0 || config.size.height <= 0)
        {
                return ZAKERO_YETANI__ERROR(Error_Cursor_Size_Too_Small);
        }
 
        if(config.image_data.empty())
        {
                return ZAKERO_YETANI__ERROR(Error_Cursor_Image_Data_Is_Empty);
        }
        else if(config.image_data.size() > 1)
        {
                if(config.time_per_frame.count() <= 0)
                {
                        return ZAKERO_YETANI__ERROR(Error_Cursor_Frame_Time_Too_Small);
                }
 
                if(config.time_per_frame.count() > Size_Max)
                {
                        return ZAKERO_YETANI__ERROR(Error_Cursor_Frame_Time_Too_Large);
                }
        }
 
        std::error_code error = cursorCreateCursor(name, config);
 
        return error;
}
 
 
std::error_code Yetani::cursorCreateCursor(const std::string& cursor_name   
        , const Yetani::CursorConfig&                         cursor_config 
        ) noexcept
{
        const uint8_t bytes_per_pixel = shmFormatBytesPerPixel(cursor_config.format);
        const size_t  frame_count     = cursor_config.image_data.size();
 
        Yetani::Cursor cursor =
        {       .wl_surface      = wl_compositor_create_surface(compositor)
        ,       .buffer_vector   = { frame_count, nullptr }
        ,       .format          = cursor_config.format
        ,       .next_frame_time = ZAKERO_STEADY_TIME_NOW(milliseconds)
        ,       .buffer_index    = 0
        ,       .time_per_frame  = uint32_t(cursor_config.time_per_frame.count())
        ,       .width           = cursor_config.size.width
        ,       .height          = cursor_config.size.height
        ,       .hotspot_x       = cursor_config.hotspot_x
        ,       .hotspot_y       = cursor_config.hotspot_y
        };
 
        if(cursor.time_per_frame == 0)
        {
                cursor.time_per_frame = Size_Max;
        }
 
        const int    stride     = cursor.width * bytes_per_pixel;
        const size_t image_size = stride * cursor.height;
 
        for(size_t i = 0; i < frame_count; i++)
        {
                std::error_code error;
 
                off_t offset = cursor_memory_pool.alloc(image_size, error);
                if(error)
                {
                        while(i > 0)
                        {
                                i--;
 
                                struct wl_buffer* buffer = cursor.buffer_vector[i];
                                cursor.buffer_vector[i] = nullptr;
 
                                off_t offset = (off_t)wl_buffer_get_user_data(buffer);
                                wl_buffer_destroy(buffer);
 
                                cursor_memory_pool.free(offset);
                        }
 
                        return error;
                }
 
                uint32_t* p = (uint32_t*)cursor_memory_pool.addressOf(offset);
                memcpy(p, (uint8_t*)cursor_config.image_data[i], image_size);
 
                cursor.buffer_vector[i] = wl_shm_pool_create_buffer(cursor_shm_pool
                        , offset
                        , cursor.width
                        , cursor.height
                        , stride
                        , cursor.format
                        );
 
                wl_buffer_set_user_data(cursor.buffer_vector[i], (void*)offset);
        }
 
        wl_surface_attach(cursor.wl_surface, cursor.buffer_vector[0], 0, 0);
        wl_surface_commit(cursor.wl_surface);
 
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        cursor_map[cursor_name] = cursor;
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
std::error_code Yetani::cursorDestroy(const std::string& name 
        ) noexcept
{
        Yetani::Cursor cursor;
 
        {
                std::lock_guard<std::mutex> lock(cursor_mutex);
 
                if(cursor_map.contains(name) == false)
                {
                        return ZAKERO_YETANI__ERROR(Error_Cursor_Does_Not_Exist);
                }
 
                cursor = cursor_map[name];
 
                cursor_map.erase(name);
        }
 
        auto iter = std::begin(cursor_surface_map);
        auto iter_end = std::end(cursor_surface_map);
        while(iter != iter_end)
        {
                if(cursor.wl_surface == iter->second.wl_surface)
                {
                        iter = cursor_surface_map.erase(iter);
                }
                else
                {
                        iter++;
                }
        }
 
        if(cursor.wl_surface)
        {
                wl_surface_destroy(cursor.wl_surface);
                cursor.wl_surface = nullptr;
        }
 
        for(wl_buffer* buffer : cursor.buffer_vector)
        {
                off_t offset = (off_t)wl_buffer_get_user_data(buffer);
                wl_buffer_destroy(buffer);
 
                cursor_memory_pool.free(offset);
        }
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
void Yetani::cursorEnter(wl_pointer* wl_pointer 
        , uint32_t                   serial     
        , struct wl_surface*         wl_surface 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        cursor_pointer = wl_pointer;
 
        if(cursor_surface_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::CursorSurface& cursor_surface = cursor_surface_map[wl_surface];
 
        cursor_surface.wl_pointer = wl_pointer;
        cursor_surface.serial     = serial;
 
        if(cursor_surface.is_visible)
        {
                wl_pointer_set_cursor(cursor_surface.wl_pointer
                        , cursor_surface.serial
                        , cursor_surface.wl_surface
                        , cursor_surface.hotspot_x
                        , cursor_surface.hotspot_y
                        );
        }
        else
        {
                wl_pointer_set_cursor(cursor_surface.wl_pointer
                        , cursor_surface.serial
                        , nullptr
                        , 0
                        , 0
                        );
        }
}
 
 
void Yetani::cursorLeave(struct wl_surface* wl_surface 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        cursor_pointer = nullptr;
 
        if(cursor_surface_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::CursorSurface& cursor_surface = cursor_surface_map[wl_surface];
 
        cursor_surface.wl_pointer = nullptr;
        cursor_surface.serial     = 0;
}
 
 
void Yetani::cursorHide(struct wl_surface* wl_surface 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        if(cursor_surface_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::CursorSurface& cursor_surface = cursor_surface_map[wl_surface];
 
        cursor_surface.is_visible = false;
 
        if(cursor_surface.wl_pointer != nullptr)
        {
                wl_pointer_set_cursor(cursor_surface.wl_pointer
                        , cursor_surface.serial
                        , nullptr
                        , 0
                        , 0
                        );
        }
}
 
 
void Yetani::cursorShow(struct wl_surface* wl_surface 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        if(cursor_surface_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::CursorSurface& cursor_surface = cursor_surface_map[wl_surface];
 
        cursor_surface.is_visible = true;
 
        if(cursor_surface.wl_pointer != nullptr)
        {
                wl_pointer_set_cursor(cursor_surface.wl_pointer
                        , cursor_surface.serial
                        , cursor_surface.wl_surface
                        , cursor_surface.hotspot_x
                        , cursor_surface.hotspot_y
                        );
        }
}
 
 
bool Yetani::cursorIsHidden(struct wl_surface* wl_surface 
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        if(cursor_surface_map.contains(wl_surface) == false)
        {
                return true;
        }
 
        const Yetani::CursorSurface& cursor_surface = cursor_surface_map.at(wl_surface);
 
        return !(cursor_surface.is_visible);
}
 
 
void Yetani::cursorSetup() noexcept
{
        cursor_map.clear();
 
        uint64_t bytes = zakero::convert((uint64_t)4, zakero::Storage::Kilobyte, zakero::Storage::Byte);
        cursor_memory_pool.init(bytes, true, zakero::MemoryPool::Alignment::Bits_32);
 
        cursor_memory_pool.sizeOnChange([&](size_t new_size)
        {
                wl_shm_pool_resize(cursor_shm_pool, new_size);
        });
 
        cursor_shm_pool = wl_shm_create_pool(shm, cursor_memory_pool.fd(), cursor_memory_pool.size());
}
 
 
void Yetani::cursorTeardown() noexcept
{
        while(cursor_map.empty() == false)
        {
                const auto& iter = cursor_map.begin();
 
                const std::string& name = iter->first;
 
                cursorDestroy(name);
        }
 
        if(cursor_shm_pool != nullptr)
        {
                wl_shm_pool_destroy(cursor_shm_pool);
        }
}
 
 
std::error_code Yetani::cursorAttach(const std::string& cursor_name 
        , struct wl_surface*                            wl_surface  
        ) noexcept
{
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        if(cursor_map.contains(cursor_name) == false)
        {
                return ZAKERO_YETANI__ERROR(Error_Cursor_Does_Not_Exist);
        }
 
        if(cursor_surface_map.contains(wl_surface) == false)
        {
                cursor_surface_map[wl_surface] =
                {       .wl_pointer = cursor_pointer
                ,       .wl_surface = nullptr
                ,       .serial     = 0
                ,       .hotspot_x  = 0
                ,       .hotspot_y  = 0
                ,       .is_visible = true
                };
        }
 
        Yetani::CursorSurface& cursor_surface = cursor_surface_map[wl_surface];
        Yetani::Cursor&        cursor         = cursor_map[cursor_name];
 
        cursor_surface.wl_surface = cursor.wl_surface;
        cursor_surface.hotspot_x  = cursor.hotspot_x;
        cursor_surface.hotspot_y  = cursor.hotspot_y;
 
        if(cursor_surface.wl_pointer != nullptr)
        {
                if(cursor_surface.is_visible)
                {
                        wl_pointer_set_cursor(cursor_surface.wl_pointer
                                , cursor_surface.serial
                                , cursor_surface.wl_surface
                                , cursor_surface.hotspot_x
                                , cursor_surface.hotspot_y
                                );
                }
                else
                {
                        wl_pointer_set_cursor(cursor_surface.wl_pointer
                                , cursor_surface.serial
                                , nullptr
                                , 0
                                , 0
                                );
                }
        }
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
std::error_code Yetani::cursorDetach(struct wl_surface* wl_surface 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(cursor_mutex);
 
        if(cursor_surface_map.contains(wl_surface) == false)
        {
                return ZAKERO_YETANI__ERROR(Error_Cursor_Not_Attached);
        }
 
        Yetani::CursorSurface& cursor_surface = cursor_surface_map[wl_surface];
 
        if(cursor_surface.wl_pointer != nullptr)
        {
                wl_pointer_set_cursor(cursor_surface.wl_pointer
                        , cursor_surface.serial
                        , nullptr
                        , 0
                        , 0
                        );
        }
 
        cursor_surface_map.erase(wl_surface);
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
// }}}
// {{{ Event Loop
 
//#define ZAKERO_YETANI__ENABLE_THREAD_SCHEDULER
 
void Yetani::eventLoopStart() noexcept
{
        event_loop = std::jthread(&Yetani::eventLoop, this);
 
        while(event_loop_is_running.load() == false)
        {
                // Wait for the thread to start
                std::this_thread::sleep_for(std::chrono::nanoseconds(42));
        }
 
        #ifdef ZAKERO_YETANI__ENABLE_THREAD_SCHEDULER
        int policy = SCHED_FIFO;
        int priority_min = sched_get_priority_min(policy);
        int priority_max = sched_get_priority_max(policy);
 
        sched_param sched =
        {       .sched_priority = (priority_min + priority_max) / 2
        };
 
        pthread_setschedparam(event_loop.native_handle(), policy, &sched);
        #endif
}
 
 
void Yetani::eventLoop(std::stop_token thread_token 
        , Yetani*                      yetani       
        ) noexcept
{
        struct pollfd fd_status =
        {       .fd      = wl_display_get_fd(yetani->display)
        ,       .events  = POLLIN | POLLOUT
        ,       .revents = 0
        };
 
        yetani->event_loop_is_running.store(true);
 
        // Handle events and render window contents
        while(thread_token.stop_requested() == false)
        {
                poll(&fd_status, 1, 1);
 
                if(fd_status.revents & POLLIN)
                {
                        wl_display_dispatch(yetani->display);
                }
 
                yetani->cursorAnimate();
 
                keyboardRepeat(yetani->keyboard);
 
                if(fd_status.revents & POLLOUT)
                {
                        wl_display_flush(yetani->display);
                }
 
                #ifdef ZAKERO_YETANI__ENABLE_THREAD_SCHEDULER
                std::this_thread::yield();
                #endif
        }
 
        yetani->event_loop_is_running.store(false);
}
 
// }}}
// {{{ Shared Memory
 
const Yetani::VectorShmFormat& Yetani::shmFormatAvailable() const noexcept
{
        return shm_format_vector;
}
 
 
uint8_t Yetani::shmFormatBytesPerPixel(const wl_shm_format shm_format 
        ) noexcept
{
        switch(shm_format)
        {
#define X(value_, bytes_, desc_) \
                case value_: return bytes_;
                ZAKERO_YETANI__SHM_FORMAT
#undef X
                default: return 0;
        }
}
 
 
std::string Yetani::shmFormatDescription(const wl_shm_format shm_format 
        ) noexcept
{
        switch(shm_format)
        {
#define X(value_, bytes_, desc_) \
                case value_: return desc_;
                ZAKERO_YETANI__SHM_FORMAT
#undef X
                default: return "";
        }
}
 
 
std::string Yetani::shmFormatName(const wl_shm_format shm_format 
        ) noexcept
{
        switch(shm_format)
        {
#define X(value_, bytes_, desc_) \
                case value_: return #value_;
                ZAKERO_YETANI__SHM_FORMAT
#undef X
                default: return "";
        }
}
 
// }}}
// {{{ Utility
 
 
// }}}
// {{{ Wayland : Buffer
 
struct wl_buffer* Yetani::bufferCreate(Yetani::SurfaceSize& surface_size  
        , Yetani::Window::Memory*                           window_memory 
        , Yetani::Buffer*                                   buffer        
        ) noexcept
{
        off_t offset = window_memory->memory_pool.alloc(surface_size.in_bytes);
 
        struct wl_buffer* wl_buffer = wl_shm_pool_create_buffer(window_memory->wl_shm_pool
                , offset
                , surface_size.width
                , surface_size.height
                , surface_size.stride
                , surface_size.pixel_format
                );
 
        wl_buffer_set_user_data(wl_buffer, buffer);
 
        buffer->mutex.lock();
        {
                buffer->map[wl_buffer] =
                {       .memory_pool = &window_memory->memory_pool
                ,       .offset      = offset
                };
        }
        buffer->mutex.unlock();
 
        return wl_buffer;
}
 
 
void Yetani::bufferDestroy(struct wl_buffer*& wl_buffer 
        ) noexcept
{
        Yetani::Buffer* buffer = (Yetani::Buffer*)wl_buffer_get_user_data(wl_buffer);
 
        wl_buffer_destroy(wl_buffer);
 
        buffer->mutex.lock();
        {
                BufferData& buffer_data = buffer->map[wl_buffer];
 
                buffer_data.memory_pool->free(buffer_data.offset);
 
                buffer->map.erase(wl_buffer);
        }
        buffer->mutex.unlock();
 
        wl_buffer = nullptr;
}
 
// }}}
// {{{ Wayland : Output
 
Yetani::Output Yetani::output(const Yetani::OutputId output_id 
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                ZAKERO_YETANI__DEBUG
                        << "Invalid output_id: "
                        << std::to_string(output_id)
                        ;
 
                return {};
        }
 
        struct wl_output* wl_output = output_data.outputid_to_wloutput.at(output_id);
 
        return output_data.output_map.at(wl_output);
}
 
 
Yetani::VectorOutputId Yetani::outputVector() const noexcept
{
        Yetani::VectorOutputId vector;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        for(const auto& iter : output_data.outputid_to_wloutput)
        {
                vector.push_back(iter.first);
        }
 
        return vector;
}
 
 
std::string Yetani::outputSubpixelName(int32_t subpixel_format 
        ) noexcept
{
        switch(subpixel_format)
        {
#define X(value_, name_) \
                case value_: return name_;
                ZAKERO_YETANI__OUTPUT_SUBPIXEL
#undef X
                default: return "";
        }
}
 
 
std::string Yetani::outputTransformName(int32_t transform 
        ) noexcept
{
        switch(transform)
        {
#define X(value_, name_) \
                case value_: return name_;
                ZAKERO_YETANI__OUTPUT_TRANSFORM
#undef X
                default: return "";
        }
}
 
 
Yetani::PointMm Yetani::outputConvertToMm(const Yetani::OutputId output_id 
        , const Yetani::PointPixel&                              point     
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { point.time, 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertPixelToMm(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::PointPercent Yetani::outputConvertToPercent(const Yetani::OutputId output_id 
        , const Yetani::PointPixel&                                        point     
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { point.time, 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertPixelToPercent(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::PointPixel Yetani::outputConvertToPixel(const Yetani::OutputId output_id 
        , const Yetani::PointMm&                                       point     
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { point.time, 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertMmToPixel(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::PointPixel Yetani::outputConvertToPixel(const Yetani::OutputId output_id 
        , const Yetani::PointPercent&                                  point     
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { point.time, 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertPercentToPixel(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::SizeMm Yetani::outputConvertToMm(const Yetani::OutputId output_id 
        , const Yetani::SizePixel&                              size      
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertPixelToMm(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
 
Yetani::SizePercent Yetani::outputConvertToPercent(const Yetani::OutputId output_id 
        , const Yetani::SizePixel&                                        size      
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertPixelToPercent(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
 
Yetani::SizePixel Yetani::outputConvertToPixel(const Yetani::OutputId output_id 
        , const Yetani::SizeMm&                                       size      
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertMmToPixel(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
 
Yetani::SizePixel Yetani::outputConvertToPixel(const Yetani::OutputId output_id 
        , const Yetani::SizePercent&                                  size      
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.outputid_to_wloutput.contains(output_id) == false)
        {
                return { 0, 0 };
        }
 
        struct wl_output*     wl_output = output_data.outputid_to_wloutput.at(output_id);
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = convertPercentToPixel(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
 
void Yetani::outputOnAdd(LambdaOutputId lambda 
        ) noexcept
{
        if(lambda == nullptr)
        {
                on_output_add = LambdaOutputId_DoNothing;
        }
        else
        {
                on_output_add = lambda;
        }
}
 
 
void Yetani::outputOnChange(LambdaOutputId lambda 
        ) noexcept
{
        if(lambda == nullptr)
        {
                on_output_change = LambdaOutputId_DoNothing;
        }
        else
        {
                on_output_change = lambda;
        }
}
 
 
void Yetani::outputOnRemove(LambdaOutputId lambda 
        ) noexcept
{
        if(lambda == nullptr)
        {
                on_output_remove = LambdaOutputId_DoNothing;
        }
        else
        {
                on_output_remove = lambda;
        }
}
 
 
void Yetani::convertPixel(struct wl_surface* wl_surface 
        , const int32_t                      pixel_xw   
        , const int32_t                      pixel_yh   
        , float&                             mm_xw      
        , float&                             mm_yh      
        , float&                             pc_xw      
        , float&                             pc_yh      
        ) const noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        const Yetani::VectorWlOutput& vector    = output_data.surface_output_map.at(wl_surface);
        struct wl_output*             wl_output = vector.front();
        const Yetani::Output&         output    = output_data.output_map.at(wl_output);
 
        auto mm = convertPixelToMm(output, pixel_xw, pixel_yh);
        mm_xw = mm.first;
        mm_yh = mm.second;
 
        auto pc = convertPixelToPercent(output, pixel_xw, pixel_yh);
        pc_xw = pc.first;
        pc_yh = pc.second;
}
 
 
std::pair<float, float> Yetani::convertPixelToMm(const Yetani::Output& output 
        , int32_t                                                      xw     
        , int32_t                                                      yh     
        ) const noexcept
{
        const float ratio_h = output.pixels_per_mm_horizontal;
        const float ratio_v = output.pixels_per_mm_vertical;
 
        return
        {       xw / ratio_h
        ,       yh / ratio_v
        };
}
 
 
std::pair<float, float> Yetani::convertPixelToPercent(const Yetani::Output& output 
        , int32_t                                                           xw     
        , int32_t                                                           yh     
        ) const noexcept
{
        return
        {       float(xw) / output.width
        ,       float(yh) / output.height
        };
}
 
 
std::pair<int32_t, int32_t> Yetani::convertMmToPixel(const Yetani::Output& output 
        , float                                                            xw     
        , float                                                            yh     
        ) const noexcept
{
        const float ratio_h = output.pixels_per_mm_horizontal;
        const float ratio_v = output.pixels_per_mm_vertical;
 
        return
        {       int32_t(xw * ratio_h)
        ,       int32_t(yh * ratio_v)
        };
}
 
 
std::pair<int32_t, int32_t> Yetani::convertPercentToPixel(const Yetani::Output& output 
        , float                                                                 xw     
        , float                                                                 yh     
        ) const noexcept
{
        return
        {       int32_t(xw * output.width)
        ,       int32_t(yh * output.height)
        };
}
 
 
void Yetani::outputNotifySurface(Yetani* yetani     
        , struct wl_output*              wl_output  
        , struct wl_surface*             wl_surface 
        ) noexcept
{
        Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
        if(surface_extent.preferred_unit == Yetani::SizeUnit::Pixel)
        {
                return;
        }
 
        Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        Yetani::VectorWlOutput& output_vector = output_data.surface_output_map[wl_surface];
 
        struct wl_output* output_current = output_vector.front();
 
        if(output_current != wl_output)
        {
                return;
        }
 
        Yetani::Output&   output   = output_data.output_map.at(wl_output);
        Yetani::SizePixel new_size = surface_extent.size_pixel;
 
        if(surface_extent.preferred_unit == Yetani::SizeUnit::Millimeter)
        {
                auto p = yetani->convertMmToPixel(output, surface_extent.size_mm.width, surface_extent.size_mm.height);
                new_size = { p.first, p.second };
        }
        else if(surface_extent.preferred_unit == Yetani::SizeUnit::Percent)
        {
                auto p = yetani->convertPercentToPixel(output, surface_extent.size_percent.width, surface_extent.size_percent.height);
                new_size = { p.first, p.second };
        }
 
        if(new_size.width <= 0)
        {
                new_size.width = 1;
        }
 
        if(new_size.height <= 0)
        {
                new_size.height = 1;
        }
 
        yetani->surface_resize_mutex_map[wl_surface].lock();
        {
                surface_extent.size_pixel = new_size;
                surfaceCalculateSize(yetani, wl_surface, new_size);
        }
        yetani->surface_resize_mutex_map[wl_surface].unlock();
}
 
// }}}
// {{{ Wayland : Seat
 
void Yetani::seatDestroy(struct wl_seat*& wl_seat 
        ) noexcept
{
        Yetani::Seat& seat = seat_map[wl_seat];
 
        if(seat.wl_keyboard != nullptr)
        {
                wl_keyboard_release(seat.wl_keyboard);
                seat.wl_keyboard = nullptr;
        }
 
        if(seat.wl_pointer != nullptr)
        {
                wl_pointer_release(seat.wl_pointer);
                seat.wl_pointer = nullptr;
        }
 
        if(seat.wl_touch != nullptr)
        {
                wl_touch_release(seat.wl_touch);
                seat.wl_touch = nullptr;
        }
 
        seat_map.erase(wl_seat);
 
        wl_seat_release(wl_seat);
 
        wl_seat = nullptr;
}
 
// }}}
// {{{ Wayland : Seat : Keyboard
 
int32_t Yetani::keyRepeatDelay() const noexcept
{
        return keyboard.repeat_delay;
}
 
 
int32_t Yetani::keyRepeatRate() const noexcept
{
        return 1000 / keyboard.repeat_rate;
}
 
 
void Yetani::keyboardDestroy(Yetani::Keyboard& keyboard 
        ) noexcept
{
        if(keyboard.keymap != nullptr)
        {
                munmap(keyboard.keymap, keyboard.keymap_size);
        }
 
        keyboard.wl_surface   = nullptr;
        keyboard.event        = nullptr;
        keyboard.modifier     = { 0 };
        keyboard.repeat_rate  = 0;
        keyboard.repeat_delay = {};
        keyboard.keymap       = nullptr;
        keyboard.keymap_size  = 0;
}
 
 
void Yetani::keyboardRepeat(Yetani::Keyboard& keyboard 
        ) noexcept
{
        auto now = std::chrono::steady_clock::now();
 
        for(auto& iter : keyboard.repeat_map)
        {
                Yetani::KeyRepeatData& key_repeat = iter.second;
 
                if(now >= key_repeat.trigger_time)
                {
                        uint32_t key_code = iter.first;
 
                        Yetani::Key key =
                        {       .time  = key_repeat.base_time
                        ,       .code  = key_code
                        ,       .state = Yetani::KeyState::Repeat
                        };
 
                        keyboard.event->on_key(key, keyboard.modifier);
 
                        key_repeat.trigger_time = now
                                + std::chrono::milliseconds(keyboard.repeat_rate)
                                - (now - key_repeat.trigger_time)
                                ;
                        key_repeat.base_time += keyboard.repeat_rate;
                }
        }
}
 
 
void Yetani::keyboardRepeatAdd(Yetani::Keyboard& keyboard 
        , uint32_t                               key_code 
        , uint32_t                               time     
        ) noexcept
{
        auto trigger_time = std::chrono::steady_clock::now()
                + std::chrono::milliseconds(keyboard.repeat_delay)
                ;
 
        keyboard.repeat_map[key_code] =
        {       .trigger_time = trigger_time
        ,       .base_time    = time + keyboard.repeat_delay
        };
}
 
 
void Yetani::keyboardRepeatReleaseAll(Yetani::Keyboard& keyboard 
        ) noexcept
{
        while(keyboard.repeat_map.empty() == false)
        {
                auto iter = keyboard.repeat_map.begin();
 
                uint32_t key_code = iter->first;
 
                Yetani::Key key =
                {       .time  = 0
                ,       .code  = key_code
                ,       .state = Yetani::KeyState::Released
                };
 
                keyboard.event->on_key(key, keyboard.modifier);
 
                keyboard.repeat_map.erase(iter);
        }
}
 
 
void Yetani::keyboardRepeatRemove(Yetani::Keyboard& keyboard 
        , uint32_t                                  key_code 
        ) noexcept
{
        keyboard.repeat_map.erase(key_code);
}
 
// }}}
// {{{ Wayland : Seat : Pointer
 
void Yetani::pointerClear(Yetani::Pointer& pointer 
        ) noexcept
{
        pointer.enter_surface     = nullptr;
        pointer.enter_point       = { 0, 0, 0 };
        pointer.leave_surface     = nullptr;
        pointer.motion_point      = { 0, 0, 0 };
        pointer.button_event_code = 0;
        pointer.button_is_pressed = false;
        pointer.button_time       = 0;
        pointer.axis.time         = 0;
        pointer.axis.type         = Yetani::PointerAxisType::Unknown;
        pointer.axis.distance     = 0;
        pointer.axis.source       = Yetani::PointerAxisSource::Unknown;
        pointer.axis.steps        = 0;
}
 
// }}}
// {{{ Wayland : Surface
 
void Yetani::surfaceCalculateSize(Yetani* yetani     
        , struct wl_surface*              wl_surface 
        , const Yetani::SizePixel&        size       
        ) noexcept
{
        Yetani::SurfaceSize& surface_size = yetani->surface_size_map[wl_surface];
        surface_size.width    = size.width;
        surface_size.height   = size.height;
        surface_size.stride   = size.width * surface_size.bytes_per_pixel;
        surface_size.in_bytes = surface_size.stride * surface_size.height;
 
        Yetani::SurfaceFrame& surface_frame = yetani->surface_frame_map[wl_surface];
        surface_frame.width  = size.width;
        surface_frame.height = size.height;
}
 
 
struct wl_surface* Yetani::surfaceCreate(Yetani* yetani        
        , const wl_shm_format                    pixel_format  
        , const Yetani::SizePixel&               size          
        , Yetani::Window::Memory&                window_memory 
        ) noexcept
{
        struct wl_surface* wl_surface = wl_compositor_create_surface(yetani->compositor);
 
        Yetani::SurfaceSize& surface_size = yetani->surface_size_map[wl_surface];
        surface_size.pixel_format    = pixel_format;
        surface_size.bytes_per_pixel = shmFormatBytesPerPixel(pixel_format);
 
        Yetani::SurfaceFrame& surface_frame = yetani->surface_frame_map[wl_surface];
        surface_frame.wl_surface = wl_surface;
        surface_frame.time_ms    = 0;
        
        surfaceCalculateSize(yetani, wl_surface, size);
 
        surface_frame.buffer_next = bufferCreate(surface_size, &window_memory, &yetani->buffer);
 
        // A future configuration setting
        bool event_keyboard = true;
        if(event_keyboard)
        {
                yetani->keyboard.event_map[wl_surface] =
                {       .on_enter = Lambda_DoNothing
                ,       .on_leave = Lambda_DoNothing
                ,       .on_key   = LambdaKey_DoNothing
                };
        }
 
        // A future configuration setting
        bool event_pointer = true;
        if(event_pointer)
        {
                yetani->pointer.event_map[wl_surface] =
                {       .on_axis           = LambdaAxis_DoNothing
                ,       .on_axis_discrete  = Lambda_DoNothing
                ,       .on_axis_source    = Lambda_DoNothing
                ,       .on_axis_stop      = Lambda_DoNothing
                ,       .on_button_mm      = LambdaButtonMm_DoNothing
                ,       .on_button_percent = LambdaButtonPercent_DoNothing
                ,       .on_button_pixel   = LambdaButtonPixel_DoNothing
                ,       .on_enter_mm       = LambdaPointMm_DoNothing
                ,       .on_enter_percent  = LambdaPointPercent_DoNothing
                ,       .on_enter_pixel    = LambdaPointPixel_DoNothing
                ,       .on_leave          = Lambda_DoNothing
                ,       .on_motion_mm      = LambdaPointMm_DoNothing
                ,       .on_motion_percent = LambdaPointPercent_DoNothing
                ,       .on_motion_pixel   = LambdaPointPixel_DoNothing
                };
        }
 
        yetani->surface_event_map[wl_surface] =
        {       .on_size_mm_change      = LambdaSizeMm_DoNothing
        ,       .on_size_percent_change = LambdaSizePercent_DoNothing
        ,       .on_size_pixel_change   = LambdaSizePixel_DoNothing
        };
 
        wl_surface_add_listener(wl_surface
                , &surface_listener
                , yetani
                );
 
        return wl_surface;
}
 
 
void Yetani::surfaceDestroy(Yetani* yetani     
        , struct wl_surface*&       wl_surface 
        ) noexcept
{
        if(wl_surface == nullptr)
        {
                return;
        }
 
        if(yetani->surface_frame_map.contains(wl_surface))
        {
                Yetani::SurfaceFrame& surface_frame = yetani->surface_frame_map[wl_surface];
 
                struct wl_buffer* wl_buffer = nullptr;
                wl_buffer = surface_frame.buffer_next.exchange(nullptr);
 
                if(wl_buffer != nullptr)
                {
                        bufferDestroy(wl_buffer);
                }
        }
 
        if(yetani->keyboard.event_map.contains(wl_surface))
        {
                yetani->keyboard.event_map.erase(wl_surface);
        }
 
        if(yetani->pointer.event_map.contains(wl_surface))
        {
                yetani->pointer.event_map.erase(wl_surface);
        }
 
        yetani->surface_size_map.erase(wl_surface);
        yetani->surface_frame_map.erase(wl_surface);
        yetani->surface_event_map.erase(wl_surface);
 
        yetani->cursorDetach(wl_surface);
 
        wl_surface_destroy(wl_surface);
        wl_surface = nullptr;
}
 
// }}}
// {{{ Wayland : Listener Handlers : Buffer
 
void Yetani::handlerBufferRelease(void* //data
        , struct wl_buffer*             wl_buffer 
        ) noexcept
{
        Yetani::bufferDestroy(wl_buffer);
}
 
// }}}
// {{{ Wayland : Listener Handlers : Keyboard
 
void Yetani::handlerKeyboardEnter(void* data        
        , struct wl_keyboard*        // wl_keyboard
        , uint32_t                   // serial
        , struct wl_surface*            wl_surface  
        , struct wl_array*              key_array   
        ) noexcept
{
        Yetani::Keyboard& keyboard = *((Yetani::Keyboard*)data);
 
        if(keyboard.wl_surface != nullptr)
        {
                keyboardRepeatReleaseAll(keyboard);
 
                keyboard.event->on_leave();
        }
 
        keyboard.wl_surface = wl_surface;
 
        if(keyboard.event_map.contains(wl_surface))
        {
                keyboard.event = &(keyboard.event_map[wl_surface]);
        }
        else
        {
                keyboard.event = &(keyboard.event_map[nullptr]);
        }
 
        keyboard.event->on_enter();
 
        if(key_array->size > 0)
        {
                Yetani::Key key =
                {       .time  = 0
                ,       .code  = 0
                ,       .state = Yetani::KeyState::Pressed
                };
 
                ZAKERO_YETANI__ARRAY_FOR_EACH(uint32_t*, key_iter, key_array)
                {
                        key.code = *key_iter;
 
                        keyboard.event->on_key(key, keyboard.modifier);
 
                        keyboardRepeatAdd(keyboard, key.code, 0);
                }
        }
}
 
 
void Yetani::handlerKeyboardKey(void* data        
        , struct wl_keyboard*      // wl_keyboard
        , uint32_t                 // serial
        , uint32_t                    time        
        , uint32_t                    key_code    
        , uint32_t                    state       
        ) noexcept
{
        Yetani::Keyboard& keyboard = *((Yetani::Keyboard*)data);
 
        Yetani::Key key =
        {       .time = time
        ,       .code = key_code
        ,       .state = (state == WL_KEYBOARD_KEY_STATE_PRESSED)
                        ? Yetani::KeyState::Pressed
                        : Yetani::KeyState::Released
        };
 
        keyboard.event->on_key(key, keyboard.modifier);
 
        if(key.state == Yetani::KeyState::Pressed
                && keyboard.repeat_rate > 0
                )
        {
                keyboardRepeatAdd(keyboard, key_code, time);
        }
        else if(key.state == Yetani::KeyState::Released)
        {
                keyboardRepeatRemove(keyboard, key_code);
        }
}
 
 
void Yetani::handlerKeyboardKeymap(void* data        
        , struct wl_keyboard*         // wl_keyboard
        , uint32_t                       format      
        , int32_t                        fd          
        , uint32_t                       size        
        ) noexcept
{
        Yetani::Keyboard& keyboard = *((Yetani::Keyboard*)data);
 
        if(format == WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1)
        {
                if(keyboard.keymap != nullptr)
                {
                        munmap(keyboard.keymap
                                , keyboard.keymap_size
                                );
                }
 
                keyboard.keymap = (char*)mmap(nullptr
                        , size
                        , PROT_READ
                        , MAP_NORESERVE | MAP_PRIVATE
                        , fd
                        , 0
                        );
                keyboard.keymap_size = size;
        }
        else // (format == WL_KEYBOARD_KEYMAP_FORMAT_NO_KEYMAP)
        {
                if(keyboard.keymap != nullptr)
                {
                        munmap(keyboard.keymap
                                , keyboard.keymap_size
                                );
 
                        keyboard.keymap      = nullptr;
                        keyboard.keymap_size = 0;
                }
        }
}
 
 
void Yetani::handlerKeyboardLeave(void* data        
        , struct wl_keyboard*        // wl_keyboard
        , uint32_t                   // serial
        , struct wl_surface*            wl_surface  
        ) noexcept
{
        Yetani::Keyboard& keyboard = *((Yetani::Keyboard*)data);
 
        if(keyboard.wl_surface == wl_surface)
        {
                keyboardRepeatReleaseAll(keyboard);
 
                keyboard.event->on_leave();
 
                keyboard.event = &(keyboard.event_map[nullptr]);
                keyboard.wl_surface = nullptr;
        }
}
 
 
void Yetani::handlerKeyboardModifiers(void* data         
        , struct wl_keyboard*            // wl_keyboard
        , uint32_t                       // serial
        , uint32_t                          mods_pressed 
        , uint32_t                          mods_latched 
        , uint32_t                          mods_locked  
        , uint32_t                          group        
        ) noexcept
{
        Yetani::Keyboard& keyboard = *((Yetani::Keyboard*)data);
 
        keyboard.modifier.pressed = mods_pressed;
        keyboard.modifier.latched = mods_latched;
        keyboard.modifier.locked  = mods_locked;
        keyboard.modifier.group   = group;
}
 
 
void Yetani::handlerKeyboardRepeatInfo(void* data        
        , struct wl_keyboard*             // wl_keyboard
        , int32_t                            rate        
        , int32_t                            delay       
        ) noexcept
{
        Yetani::Keyboard& keyboard = *((Yetani::Keyboard*)data);
 
        keyboard.repeat_delay = delay;
        keyboard.repeat_rate  = 1000 / rate;
}
 
// }}}
// {{{ Wayland : Listener Handlers : Output
 
void Yetani::handlerOutputDone(void* data      
        , struct wl_output*          wl_output 
        ) noexcept
{
        Yetani*          yetani    = (Yetani*)data;
        Yetani::Output&  output    = yetani->output_data.output_map[wl_output];
        Yetani::Output&  changes   = yetani->output_changes_map[wl_output];
        Yetani::OutputId output_id = yetani->output_data.wloutput_to_outputid[wl_output];
 
        output = changes;
        output.pixels_per_mm_horizontal = output.width / float(output.physical_width_mm);
        output.pixels_per_mm_vertical   = output.height / float(output.physical_height_mm);
 
        ZAKERO_YETANI__DEBUG << "\n" << to_string(output) << "\n";
 
        switch(yetani->output_state_map[wl_output])
        {
                case Yetani::OutputState::Done:
                        // Do Nothing
                        break;
 
                case Yetani::OutputState::Added:
                        yetani->on_output_add(output_id);
                        break;
 
                case Yetani::OutputState::Changed:
                        yetani->on_output_change(output_id);
 
                        for(auto wl_surface : yetani->output_notify_surface_vector)
                        {
                                outputNotifySurface(yetani, wl_output, wl_surface);
                        }
 
                        break;
        }
 
        yetani->output_state_map[wl_output] = Yetani::OutputState::Done;
}
 
 
void Yetani::handlerOutputGeometry(void* data            
        , struct wl_output*              wl_output       
        , int32_t                        x               
        , int32_t                        y               
        , int32_t                        physical_width  
        , int32_t                        physical_height 
        , int32_t                        subpixel        
        , const char*                    make            
        , const char*                    model           
        , int32_t                        transform       
        ) noexcept
{
        Yetani*         yetani         = (Yetani*)data;
        Yetani::Output& output_changes = yetani->output_changes_map[wl_output];
 
        if(yetani->output_state_map[wl_output] != Yetani::OutputState::Added)
        {
                yetani->output_state_map[wl_output] = Yetani::OutputState::Changed;
        }
 
        output_changes.x                  = x;
        output_changes.y                  = y;
        output_changes.physical_width_mm  = physical_width;
        output_changes.physical_height_mm = physical_height;
        output_changes.subpixel           = subpixel;
        output_changes.make               = std::string(make);
        output_changes.model              = std::string(model);
        output_changes.transform          = transform;
}
 
 
void Yetani::handlerOutputMode(void* data      
        , struct wl_output*          wl_output 
        , uint32_t                   flags     
        , int32_t                    width     
        , int32_t                    height    
        , int32_t                    refresh   
        ) noexcept
{
        Yetani*         yetani         = (Yetani*)data;
        Yetani::Output& output_changes = yetani->output_changes_map[wl_output];
 
        if(yetani->output_state_map[wl_output] != Yetani::OutputState::Added)
        {
                yetani->output_state_map[wl_output] = Yetani::OutputState::Changed;
        }
 
        output_changes.flags       = flags;
        output_changes.width       = width;
        output_changes.height      = height;
        output_changes.refresh_mHz = refresh;
}
 
 
void Yetani::handlerOutputScale(void* data      
        , struct wl_output*           wl_output 
        , int32_t                     factor    
        ) noexcept
{
        Yetani* yetani         = (Yetani*)data;
        Output& output_changes = yetani->output_changes_map[wl_output];
 
        if(yetani->output_state_map[wl_output] != Yetani::OutputState::Added)
        {
                yetani->output_state_map[wl_output] = Yetani::OutputState::Changed;
        }
 
        output_changes.scale_factor = factor;
}
 
// }}}
// {{{ Wayland : Listener Handlers : Pointer
 
void Yetani::handlerPointerAxis(void* data       
        , struct wl_pointer*          //wl_pointer ///< The Wayland Pointer
        , uint32_t                    time       
        , uint32_t                    axis       
        , wl_fixed_t                  value      
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
 
        pointer.axis.time     = time;
        pointer.axis.distance = (float)wl_fixed_to_double(value);
 
        if(axis == WL_POINTER_AXIS_HORIZONTAL_SCROLL)
        {
                pointer.axis.type = Yetani::PointerAxisType::Horizontal;
        }
        else if(axis == WL_POINTER_AXIS_VERTICAL_SCROLL)
        {
                pointer.axis.type = Yetani::PointerAxisType::Vertical;
        }
        else
        {
                pointer.axis.type = Yetani::PointerAxisType::Unknown;
        }
}
 
 
void Yetani::handlerPointerAxisDiscrete(void* data       
        , struct wl_pointer*                  //wl_pointer ///< The Wayland Pointer
        , uint32_t                            //axis       ///< The axis
        , int32_t                             discrete   
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
 
        pointer.axis.steps = discrete;
}
 
 
void Yetani::handlerPointerAxisSource(void* data        
        , struct wl_pointer*                //wl_pointer  ///< The Wayland Pointer
        , uint32_t                          axis_source 
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
 
        switch(axis_source)
        {
                case WL_POINTER_AXIS_SOURCE_WHEEL:
                        pointer.axis.source = Yetani::PointerAxisSource::Wheel;
                        break;
 
                case WL_POINTER_AXIS_SOURCE_FINGER:
                        pointer.axis.source = Yetani::PointerAxisSource::Finger;
                        break;
 
                case WL_POINTER_AXIS_SOURCE_CONTINUOUS:
                        pointer.axis.source = Yetani::PointerAxisSource::Continuous;
                        break;
 
                case WL_POINTER_AXIS_SOURCE_WHEEL_TILT:
                        pointer.axis.source = Yetani::PointerAxisSource::Wheel_Tilt;
                        break;
 
                default:
                        pointer.axis.source = Yetani::PointerAxisSource::Unknown;
        }
}
 
 
void Yetani::handlerPointerAxisStop(void*
        , struct wl_pointer*
        , uint32_t
        , uint32_t
        ) noexcept
{
        // --- Ignored ---
        //
        // Wayland documentation suggests that the "axis stop" can be used for
        // kinetic scrolling or to determine when one axis motions begins anew.
        // 
        // This is not needed.
        // - For kinetic scrolling: Have the default scrolling be kinetic and
        //   treat axis input as a new (or additive) velocity.
        // - For separation of axis motion, why?  If there is a pause in the
        //   motion, that reflects the user input.
}
 
 
void Yetani::handlerPointerButton(void* data       
        , struct wl_pointer*            //wl_pointer ///< The Wayland Pointer
        , uint32_t                      //serial     ///< The Event Id
        , uint32_t                      time       
        , uint32_t                      button     
        , uint32_t                      state      
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
 
        pointer.button.code = button;
        pointer.button_time = time;
 
        if(state == WL_POINTER_BUTTON_STATE_RELEASED)
        {
                pointer.button.state = Yetani::PointerButtonState::Released;
        }
        else if(state == WL_POINTER_BUTTON_STATE_PRESSED)
        {
                pointer.button.state = Yetani::PointerButtonState::Pressed;
        }
}
 
 
void Yetani::handlerPointerEnter(void* data       
        , struct wl_pointer*           //wl_pointer ///< The Wayland Pointer
        , uint32_t                     serial     
        , struct wl_surface*           wl_surface 
        , wl_fixed_t                   surface_x  
        , wl_fixed_t                   surface_y  
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
 
        pointer.enter_serial  = serial;
        pointer.enter_surface = wl_surface;
 
        pointer.enter_point =
        {       .time = 0
        ,       .x    = wl_fixed_to_int(surface_x)
        ,       .y    = wl_fixed_to_int(surface_y)
        };
}
 
 
void Yetani::handlerPointerFrame(void* data       
        , struct wl_pointer*           wl_pointer 
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
        Yetani*          yetani  = pointer.yetani;
 
        if(pointer.enter_surface != nullptr)
        {
                if(pointer.wl_surface != nullptr)
                {
                        yetani->cursorLeave(pointer.wl_surface);
                        pointer.event_map[pointer.wl_surface].on_leave();
                }
 
                yetani->cursorEnter(wl_pointer
                        , pointer.enter_serial
                        , pointer.enter_surface
                        );
 
                pointer.wl_surface  = pointer.enter_surface;
                pointer.point_pixel = pointer.enter_point;
 
                if(pointer.event_map.contains(pointer.wl_surface))
                {
                        pointer.event = &(pointer.event_map[pointer.wl_surface]);
                }
                else
                {
                        pointer.event = &(pointer.event_map[nullptr]);
                }
 
                yetani->convertPixel(pointer.enter_surface
                        , pointer.point_pixel.x  , pointer.point_pixel.y
                        , pointer.point_mm.x     , pointer.point_mm.y
                        , pointer.point_percent.x, pointer.point_percent.y
                        );
 
                pointer.event->on_enter_pixel(pointer.point_pixel
                        , yetani->keyboard.modifier
                        );
                pointer.event->on_enter_mm(pointer.point_mm
                        , yetani->keyboard.modifier
                        );
                pointer.event->on_enter_percent(pointer.point_percent
                        , yetani->keyboard.modifier
                        );
        }
 
        if((pointer.motion_point.time != 0)
                && (pointer.wl_surface != nullptr)
                )
        {
                pointer.point_pixel = pointer.motion_point;
 
                yetani->convertPixel(pointer.wl_surface
                        , pointer.point_pixel.x  , pointer.point_pixel.y
                        , pointer.point_mm.x     , pointer.point_mm.y
                        , pointer.point_percent.x, pointer.point_percent.y
                        );
                pointer.point_mm.time      = pointer.point_pixel.time;
                pointer.point_percent.time = pointer.point_pixel.time;
 
                pointer.event->on_motion_pixel(pointer.point_pixel
                        , yetani->keyboard.modifier
                        );
                pointer.event->on_motion_mm(pointer.point_mm
                        , yetani->keyboard.modifier
                        );
                pointer.event->on_motion_percent(pointer.point_percent
                        , yetani->keyboard.modifier
                        );
        }
 
        if((pointer.button_time != 0)
                && (pointer.wl_surface != nullptr)
                )
        {
                pointer.point_mm.time      = pointer.button_time;
                pointer.point_percent.time = pointer.button_time;
                pointer.point_pixel.time   = pointer.button_time;
 
                pointer.event->on_button_pixel(pointer.button
                        , pointer.point_pixel
                        , yetani->keyboard.modifier
                        );
                pointer.event->on_button_mm(pointer.button
                        , pointer.point_mm
                        , yetani->keyboard.modifier
                        );
                pointer.event->on_button_percent(pointer.button
                        , pointer.point_percent
                        , yetani->keyboard.modifier
                        );
        }
 
        if((pointer.axis.time != 0)
                && (pointer.wl_surface != nullptr)
                )
        {
                pointer.event->on_axis(pointer.axis
                        , yetani->keyboard.modifier
                        );
        }
 
        if((pointer.leave_surface != nullptr)
                && (pointer.leave_surface == pointer.wl_surface)
                )
        {
                yetani->cursorLeave(pointer.leave_surface);
 
                pointer.event->on_leave();
 
                pointer.event = &(pointer.event_map[nullptr]);
                pointer.wl_surface = nullptr;
        }
 
        pointerClear(pointer);
}
 
 
void Yetani::handlerPointerLeave(void* data       
        , struct wl_pointer*           //wl_pointer ///< The Wayland Pointer
        , uint32_t                     //serial     ///< The Event Id
        , struct wl_surface*           wl_surface 
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
 
        pointer.leave_surface = wl_surface;
}
 
 
void Yetani::handlerPointerMotion(void* data       
        , struct wl_pointer*            //wl_pointer ///< The Wayland Pointer
        , uint32_t                      time       
        , wl_fixed_t                    surface_x  
        , wl_fixed_t                    surface_y  
        ) noexcept
{
        Yetani::Pointer& pointer = *((Yetani::Pointer*)data);
 
        pointer.motion_point =
        {       .time = time
        ,       .x    = wl_fixed_to_int(surface_x)
        ,       .y    = wl_fixed_to_int(surface_y)
        };
}
 
// }}}
// {{{ Wayland : Listener Handlers : Registry
 
void Yetani::handlerRegistryGlobal(void* data      
        , struct wl_registry*            registry  
        , uint32_t                       id        
        , const char*                    interface 
        , uint32_t                       version   
        ) noexcept
{
        Yetani* yetani = (Yetani*)data;
 
        std::string_view interface_name(interface);
        ZAKERO_YETANI__DEBUG_VAR(interface_name);
 
        if(interface_name == wl_compositor_interface.name)
        {
                yetani->compositor = (struct wl_compositor*)
                        wl_registry_bind(registry
                                , id
                                , &wl_compositor_interface
                                , 1
                                );
 
                return;
        }
 
        if(interface_name == wl_output_interface.name)
        {
                struct wl_output* wl_output = (struct wl_output*)wl_registry_bind(registry
                        , id
                        , &wl_output_interface
                        , 2
                        );
 
                yetani->output_data.wloutput_to_outputid[wl_output] = id;
                yetani->output_data.outputid_to_wloutput[id]        = wl_output;
                yetani->output_data.output_map[wl_output]           = {};
                yetani->output_changes_map[wl_output]               = {};
                yetani->output_state_map[wl_output]                 = Yetani::OutputState::Added;
 
                wl_output_add_listener(wl_output
                        , &Yetani::output_listener
                        , yetani
                        );
 
                return;
        }
 
        if(interface_name == wl_seat_interface.name)
        {
                yetani->seat = (struct wl_seat*)
                        wl_registry_bind(registry
                                , id
                                , &wl_seat_interface
                                , version
                                );
 
                yetani->id_to_seat[id] = yetani->seat;
 
                wl_seat_add_listener(yetani->seat
                        , &yetani->seat_listener
                        , yetani
                        );
 
                return;
        }
 
        if(interface_name == wl_shm_interface.name)
        {
                yetani->shm = (struct wl_shm*)
                        wl_registry_bind(registry
                                , id
                                , &wl_shm_interface
                                , version
                                );
 
                wl_shm_add_listener(yetani->shm
                        , &yetani->shm_listener
                        , yetani
                        );
 
                return;
        }
 
        if(interface_name == xdg_wm_base_interface.name)
        {
                yetani->xdg_wm_base = (struct xdg_wm_base*)
                        wl_registry_bind(registry
                                , id
                                , &xdg_wm_base_interface
                                , 1
                                );
 
                xdg_wm_base_add_listener(yetani->xdg_wm_base
                        , &yetani->xdg_wm_base_listener
                        , yetani
                        );
        }
 
        if(interface_name == zxdg_decoration_manager_v1_interface.name)
        {
                yetani->decoration_manager = (struct zxdg_decoration_manager_v1*)
                        wl_registry_bind(registry
                                , id
                                , &zxdg_decoration_manager_v1_interface
                                , 1
                                );
                ZAKERO_YETANI__DEBUG << "--- Using UNSTABLE Decoration Manager ---\n";
        }
}
 
 
void Yetani::handlerRegistryRemove(void* data     
        , struct wl_registry*            //registry ///< The registry object
        , uint32_t                       id       
        ) noexcept
{
        Yetani* yetani = (Yetani*)data;
 
        printf("Got a registry remove event for id %d\n", id);
 
        // Output
        {
                std::lock_guard<std::mutex> lock(yetani->output_data.mutex);
 
                if(yetani->output_data.outputid_to_wloutput.contains(id))
                {
                        struct wl_output* wl_output = yetani->output_data.outputid_to_wloutput[id];
 
                        yetani->output_data.outputid_to_wloutput.erase(id);
                        yetani->output_data.wloutput_to_outputid.erase(wl_output);
 
                        yetani->output_changes_map.erase(wl_output);
                        yetani->output_state_map.erase(wl_output);
 
                        yetani->on_output_remove(id);
                        yetani->output_data.output_map.erase(wl_output);
 
                        return;
                }
        }
 
        // Seat
        {
                if(yetani->id_to_seat.contains(id))
                {
                        struct wl_seat* wl_seat = yetani->id_to_seat[id];
 
                        yetani->seatDestroy(wl_seat);
 
                        yetani->id_to_seat.erase(id);
                }
        }
}
 
// }}}
// {{{ Wayland : Listener Handlers : Seat
 
void Yetani::handlerSeatCapabilities(void* data         
        , struct wl_seat*                  wl_seat      
        , uint32_t                         capabilities 
        ) noexcept
{
        ZAKERO_YETANI__DEBUG_VAR((uint64_t)wl_seat);
 
        Yetani*       yetani = (Yetani*)data;
        Yetani::Seat& seat   = yetani->seat_map[wl_seat];
 
        seat.version = wl_seat_get_version(wl_seat);
 
        if(capabilities & WL_SEAT_CAPABILITY_KEYBOARD)
        {
                ZAKERO_YETANI__DEBUG << "-- Got a keyboard device --\n";
 
                yetani->keyboard.event_map[nullptr] =
                {       .on_enter = Lambda_DoNothing
                ,       .on_leave = Lambda_DoNothing
                ,       .on_key   = LambdaKey_DoNothing
                };
 
                yetani->keyboard.event = &(yetani->keyboard.event_map[nullptr]);
 
                seat.wl_keyboard = wl_seat_get_keyboard(wl_seat);
 
                wl_keyboard_add_listener(seat.wl_keyboard
                        , &Yetani::keyboard_listener
                        , &yetani->keyboard
                        );
        }
 
        if(capabilities & WL_SEAT_CAPABILITY_POINTER)
        {
                ZAKERO_YETANI__DEBUG << "-- Got a pointer device --\n";
 
                yetani->pointer.yetani = yetani;
 
                yetani->pointer.event_map[nullptr] =
                {       .on_axis           = LambdaAxis_DoNothing
                ,       .on_axis_discrete  = Lambda_DoNothing
                ,       .on_axis_source    = Lambda_DoNothing
                ,       .on_axis_stop      = Lambda_DoNothing
                ,       .on_button_mm      = LambdaButtonMm_DoNothing
                ,       .on_button_percent = LambdaButtonPercent_DoNothing
                ,       .on_button_pixel   = LambdaButtonPixel_DoNothing
                ,       .on_enter_mm       = LambdaPointMm_DoNothing
                ,       .on_enter_percent  = LambdaPointPercent_DoNothing
                ,       .on_enter_pixel    = LambdaPointPixel_DoNothing
                ,       .on_leave          = Lambda_DoNothing
                ,       .on_motion_mm      = LambdaPointMm_DoNothing
                ,       .on_motion_percent = LambdaPointPercent_DoNothing
                ,       .on_motion_pixel   = LambdaPointPixel_DoNothing
                };
 
                yetani->pointer.event = &(yetani->pointer.event_map[nullptr]);
 
                seat.wl_pointer = wl_seat_get_pointer(wl_seat);
 
                wl_pointer_add_listener(seat.wl_pointer
                        , &Yetani::pointer_listener
                        , &yetani->pointer
                        );
        }
 
        if(capabilities & WL_SEAT_CAPABILITY_TOUCH)
        {
                ZAKERO_YETANI__DEBUG << "-- Got a touch device --\n";
                seat.wl_touch = wl_seat_get_touch(wl_seat);
 
                //wl_touch_add_listener(seat.wl_touch
                //      , &Yetani::touch_listener
                //      , data
                //      );
        }
}
 
 
void Yetani::handlerSeatName(void* data    
        , struct wl_seat*          wl_seat 
        , const char*              name    
        ) noexcept
{
        ZAKERO_YETANI__DEBUG_VAR((uint64_t)wl_seat);
        ZAKERO_YETANI__DEBUG_VAR(name);
 
        Yetani* yetani = (Yetani*)data;
 
        yetani->seat_map[wl_seat].name = name;
}
 
// }}}
// {{{ Wayland : Listener Handlers : SHM
 
void Yetani::handlerShmFormat(void* data 
        , struct wl_shm*  /* Unused */
        , uint32_t value                 
        ) noexcept
{
        Yetani* yetani = (Yetani*)data;
 
        wl_shm_format format = (wl_shm_format)value;
 
        if(vectorContains(yetani->shm_format_vector, format))
        {
                return;
        }
 
        yetani->shm_format_vector.push_back(format);
}
 
// }}}
// {{{ Wayland : Listener Handlers : Surface
 
void Yetani::handlerSurfaceEnter(void* data       
        , struct wl_surface*           wl_surface 
        , struct wl_output*            wl_output  
        ) noexcept
{
        //ZAKERO_YETANI__DEBUG << "-------------------------------------------\n";
        //ZAKERO_YETANI__DEBUG_VAR(data);
        //ZAKERO_YETANI__DEBUG_VAR(wl_surface);
        //ZAKERO_YETANI__DEBUG_VAR(wl_output);
 
        Yetani* yetani = (Yetani*)data;
        Yetani::OutputData& output_data = yetani->output_data;
 
        output_data.mutex.lock();
        output_data.surface_output_map[wl_surface].push_back(wl_output);
        output_data.mutex.unlock();
}
 
 
void Yetani::handlerSurfaceLeave(void* data       
        , struct wl_surface*           wl_surface 
        , struct wl_output*            wl_output  
        ) noexcept
{
        //ZAKERO_YETANI__DEBUG << "-------------------------------------------\n";
        //ZAKERO_YETANI__DEBUG_VAR(data);
        //ZAKERO_YETANI__DEBUG_VAR(wl_surface);
        //ZAKERO_YETANI__DEBUG_VAR(wl_output);
 
        Yetani* yetani = (Yetani*)data;
 
        Yetani::OutputData& output_data = yetani->output_data;
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        Yetani::VectorWlOutput& output_vector = output_data.surface_output_map[wl_surface];
 
        // Save the current wl_output device id
        struct wl_output* current_output = output_vector.front();
 
        // Remove the wl_output device id
        zakero::vectorErase(output_vector, wl_output);
 
        // Check if the current wl_output device id was removed
        if(current_output == output_vector.front())
        {
                // Current wl_output device was not removed
                // so nothing to do.
 
                return;
        }
 
        Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
 
        if(surface_extent.preferred_unit == Yetani::SizeUnit::Pixel)
        {
                return;
        }
 
        // Convert the relative window size from the old wl_output device
        // to the new wl_output device.
        
        current_output = output_vector.front();
 
        Yetani::Output&   output   = output_data.output_map.at(current_output);
        Yetani::SizePixel new_size;
 
        if(surface_extent.preferred_unit == Yetani::SizeUnit::Millimeter)
        {
                auto p = yetani->convertMmToPixel(output
                        , surface_extent.size_mm.width
                        , surface_extent.size_mm.height
                        );
 
                new_size = { p.first, p.second };
        }
        else // if(surface_extent.preferred_unit == Yetani::SizeUnit::Percent)
        {
                auto p = yetani->convertPercentToPixel(output
                        , surface_extent.size_percent.width
                        , surface_extent.size_percent.height
                        );
 
                new_size = { p.first, p.second };
        }
 
        if(new_size.width <= 0)
        {
                new_size.width = 1;
        }
 
        if(new_size.height <= 0)
        {
                new_size.height = 1;
        }
 
        if((new_size.width != surface_extent.size_pixel.width)
                && (new_size.height != surface_extent.size_pixel.height)
                )
        {
                yetani->surface_resize_mutex_map[wl_surface].lock();
                {
                        XdgSurface& surface = yetani->xdg_surface_map[wl_surface];
 
                        surface_extent.size_pixel = new_size;
                        surfaceCalculateSize(surface.yetani, surface.wl_surface, new_size);
                }
                yetani->surface_resize_mutex_map[wl_surface].unlock();
 
                Yetani::SurfaceEvent& event = yetani->surface_event_map[wl_surface];
                event.on_size_pixel_change(surface_extent.size_pixel);
        }
}
 
// }}}
// {{{ Wayland : Listener Handlers : SwapBuffers
 
void Yetani::handlerSwapBuffers(void* data     
        , struct wl_callback*         callback 
        , uint32_t                    time_ms  
        ) noexcept
{
        Yetani::SurfaceFrame* surface_frame = (Yetani::SurfaceFrame*)data;
 
        wl_callback_destroy(callback);
 
        callback = wl_surface_frame(surface_frame->wl_surface);
 
        wl_callback_add_listener(callback
                , &frame_callback_listener
                , data
                );
 
        struct wl_buffer* wl_buffer = surface_frame->buffer_next.exchange(nullptr);
        if(wl_buffer != nullptr)
        {
                wl_buffer_add_listener(wl_buffer
                        , &Yetani::buffer_listener
                        , wl_buffer_get_user_data(wl_buffer)
                        );
 
                surface_frame->time_ms = time_ms;
 
                wl_surface_attach(surface_frame->wl_surface, wl_buffer, 0, 0);
 
                wl_surface_damage(surface_frame->wl_surface
                        , 0, 0
                        , surface_frame->width, surface_frame->height
                        );
        }
 
        wl_surface_commit(surface_frame->wl_surface);
}
 
// }}}
// {{{ Wayland : Listener Handlers (Unstable)
 
 
// }}}
// {{{ XDG
 
Yetani::WindowMode Yetani::toWindowMode(const Yetani::XdgState state 
        ) noexcept
{
        switch(state)
        {
                case Yetani::XdgState::Toplevel_Window_Fullscreen:
                        return Yetani::WindowMode::Fullscreen;
 
                case Yetani::XdgState::Toplevel_Window_Maximized:
                        return Yetani::WindowMode::Maximized;
 
                default:
                case Yetani::XdgState::Toplevel_Window_Normal:
                        return Yetani::WindowMode::Normal;
        }
}
 
 
Yetani::XdgState Yetani::toXdgState(const Yetani::WindowMode window_mode 
        ) noexcept
{
        switch(window_mode)
        {
                case Yetani::WindowMode::Fullscreen:
                        return Yetani::XdgState::Toplevel_Window_Fullscreen;
 
                case Yetani::WindowMode::Maximized:
                        return Yetani::XdgState::Toplevel_Window_Maximized;
 
                default:
                case Yetani::WindowMode::Normal:
                        return Yetani::XdgState::Toplevel_Window_Normal;
        }
}
 
// }}}
// {{{ XDG : Surface
 
struct xdg_surface* Yetani::xdgSurfaceCreate(struct wl_surface* wl_surface 
        ) noexcept
{
        XdgSurface& surface = xdg_surface_map[wl_surface];
 
        surface.yetani     = this;
        surface.wl_surface = wl_surface;
 
        surface_extent_mutex.lock();
        {
                Yetani::SurfaceExtent& surface_extent = surface_extent_map[wl_surface];
 
                surface_extent.preferred_unit    = Yetani::SizeUnit::Pixel;
                surface_extent.preferred_mm      = { 160, 90 };    // 16:9 * 10mm
                surface_extent.preferred_percent = { 0.32, 0.18 }; // 16:9 * 0.02
                surface_extent.size_mm           = { 160, 90 };    // 16:9 + 10mm
                surface_extent.size_percent      = { 0.32, 0.18 }; // 16:9 * 0.02
                surface_extent.size_pixel        = { 800, 450 };   // 16:9 * 50 pixels
                surface_extent.size_pixel_max    = { 0, 0 };       // No maximum size
                surface_extent.size_pixel_min    = { 0, 0 };       // No minimum size
        }
        surface_extent_mutex.unlock();
 
        output_notify_surface_vector.push_back(wl_surface);
 
        struct xdg_surface* xdg_surface = xdg_wm_base_get_xdg_surface(xdg_wm_base
                , wl_surface
                );
 
        xdg_state_change_mutex.lock();
        {
                xdg_state_change_map[xdg_surface] = {};
        }
        xdg_state_change_mutex.unlock();
 
        xdg_surface_add_listener(xdg_surface
                , &xdg_surface_listener
                , &surface
                );
 
        return xdg_surface;
}
 
 
void Yetani::xdgSurfaceDestroy(struct wl_surface* wl_surface  
        , struct xdg_surface*&                    xdg_surface 
        ) noexcept
{
        if(xdg_surface)
        {
                xdg_surface_destroy(xdg_surface);
        }
 
        zakero::vectorErase(output_notify_surface_vector, wl_surface);
 
        if(xdg_surface_map.contains(wl_surface))
        {
                xdg_surface_map.erase(wl_surface);
        }
 
        xdg_state_change_mutex.lock();
        {
                if(xdg_state_change_map.contains(xdg_surface))
                {
                        xdg_state_change_map.erase(xdg_surface);
                }
        }
        xdg_state_change_mutex.unlock();
 
        surface_extent_mutex.lock();
        {
                if(surface_extent_map.contains(wl_surface))
                {
                        surface_extent_map.erase(wl_surface);
                }
        }
        surface_extent_mutex.unlock();
 
        xdg_surface = nullptr;
}
 
 
void Yetani::xdgSurfaceSetExtent(struct wl_surface* wl_surface   
        , const Yetani::SizeUnit&                   size_unit    
        , const Yetani::SizeMm&                     size_mm      
        , const Yetani::SizePercent&                size_percent 
        , const Yetani::SizePixel&                  size_pixel   
        ) noexcept
{
        Yetani::SurfaceExtent& surface_extent = surface_extent_map[wl_surface];
 
        surface_extent.preferred_unit    = size_unit;
        surface_extent.preferred_mm      = size_mm;
        surface_extent.preferred_percent = size_percent;
        surface_extent.size_mm           = size_mm;
        surface_extent.size_percent      = size_percent;
        surface_extent.size_pixel        = size_pixel;
        surface_extent.size_pixel_max    = { 0, 0 };
        surface_extent.size_pixel_min    = { 0, 0 };
}
 
// }}}
// {{{ XDG : Toplevel
 
struct xdg_toplevel* Yetani::xdgToplevelCreate(struct xdg_surface* xdg_surface 
        ) noexcept
{
        Yetani::XdgToplevel& toplevel = xdg_toplevel_map[xdg_surface];
 
        toplevel.close_request_lambda = Lambda_DoNothing;
        toplevel.state_change         = &(xdg_state_change_map[xdg_surface]);
        toplevel.is_active            = false;
        toplevel.window_state         = Yetani::XdgState::Toplevel_Window_Normal;
        toplevel.is_active_lambda     = LambdaBool_DoNothing;
        toplevel.window_state_lambda  = LambdaWindowMode_DoNothing;
        toplevel.previous_size        = { 0, 0 };
        toplevel.xdg_toplevel         = nullptr;
 
        toplevel.state_change->push_back(Yetani::XdgState::Toplevel_Attach_Buffer);
 
        struct xdg_toplevel* xdg_toplevel = nullptr;
 
        xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
        toplevel.xdg_toplevel = xdg_toplevel;
 
        xdg_toplevel_add_listener(xdg_toplevel
                , &xdg_toplevel_listener
                , &toplevel
                );
 
        return xdg_toplevel;
}
 
 
void Yetani::xdgToplevelDestroy(struct xdg_surface* xdg_surface  
        , struct xdg_toplevel*&                     xdg_toplevel 
        ) noexcept
{
        if(xdg_toplevel != nullptr)
        {
                xdg_toplevel_destroy(xdg_toplevel);
        }
 
        if(xdg_toplevel_map.contains(xdg_surface))
        {
                XdgToplevel& toplevel = xdg_toplevel_map[xdg_surface];
 
                toplevel.close_request_lambda = nullptr;
                toplevel.state_change         = nullptr;
                toplevel.window_state         = Yetani::XdgState::Unknown;
                toplevel.is_active            = false;
                toplevel.is_active_lambda     = nullptr;
                toplevel.window_state_lambda  = nullptr;
 
                xdg_toplevel_map.erase(xdg_surface);
        }
 
        xdg_toplevel = nullptr;
}
 
 
void Yetani::xdgToplevelSizeChange(Yetani* yetani     
        , struct wl_surface*               wl_surface 
        , const Yetani::SizePixel&         size_pixel 
        ) noexcept
{
        Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
        Yetani::SizePixel      new_size       = surface_extent.size_pixel;
 
        if(((surface_extent.size_pixel_min.width == 0) || (size_pixel.width >= surface_extent.size_pixel_min.width))
                && ((surface_extent.size_pixel_max.width == 0) || (size_pixel.width <= surface_extent.size_pixel_max.width))
                )
        {
                new_size.width = size_pixel.width;
        }
 
        if(((surface_extent.size_pixel_min.height == 0) || (size_pixel.height >= surface_extent.size_pixel_min.height))
                && ((surface_extent.size_pixel_max.height == 0) || (size_pixel.height <= surface_extent.size_pixel_max.height))
                )
        {
                new_size.height = size_pixel.height;
        }
 
        if((new_size.width == surface_extent.size_pixel.width)
                && (new_size.height == surface_extent.size_pixel.height)
                )
        {
                return;
        }
 
        // Calculate Sizes
        Yetani::SizeMm      size_mm;
        Yetani::SizePercent size_percent;
        yetani->convertPixel(wl_surface
                , size_pixel.width  , size_pixel.height
                , size_mm.width     , size_mm.height
                , size_percent.width, size_percent.height
                );
 
        yetani->surface_resize_mutex_map[wl_surface].lock();
        {
                surface_extent.size_pixel = new_size;
                surfaceCalculateSize(yetani, wl_surface, new_size);
        }
        yetani->surface_resize_mutex_map[wl_surface].unlock();
 
        Yetani::SurfaceEvent& event = yetani->surface_event_map[wl_surface];
        event.on_size_pixel_change(surface_extent.size_pixel);
        event.on_size_mm_change(surface_extent.size_mm);
        event.on_size_percent_change(surface_extent.size_percent);
}
 
 
void Yetani::xdgToplevelSizeMinMaxChange(Yetani* yetani         
        , struct xdg_toplevel*                   xdg_toplevel   
        , struct wl_surface*                     wl_surface     
        , const Yetani::SizePixel&               size_pixel_min 
        , const Yetani::SizePixel&               size_pixel_max 
        ) noexcept
{
        Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
 
        Yetani::SizePixel size_pixel     = surface_extent.size_pixel;
        bool              need_to_resize = false;
 
        if(size_pixel_max.width > 0
                && size_pixel_max.width < surface_extent.size_pixel.width
                )
        {
                need_to_resize = true;
                size_pixel.width = size_pixel_max.width;
        }
 
        if(size_pixel_max.height > 0
                && size_pixel_max.height < surface_extent.size_pixel.height
                )
        {
                need_to_resize = true;
                size_pixel.height = size_pixel_max.height;
        }
 
        if(size_pixel_min.width > 0
                && size_pixel_min.width > surface_extent.size_pixel.width
                )
        {
                need_to_resize = true;
                size_pixel.width = size_pixel_min.width;
        }
 
        if(size_pixel_min.height > 0
                && size_pixel_min.height > surface_extent.size_pixel.height
                )
        {
                need_to_resize = true;
                size_pixel.height = size_pixel_min.height;
        }
 
        if(need_to_resize)
        {
                xdg_toplevel_set_max_size(xdg_toplevel, 0, 0);
                xdg_toplevel_set_min_size(xdg_toplevel, 0, 0);
 
                yetani->surface_resize_mutex_map[wl_surface].lock();
                {
                        surface_extent.size_pixel = size_pixel;
                        surfaceCalculateSize(yetani, wl_surface, size_pixel);
                }
                yetani->surface_resize_mutex_map[wl_surface].unlock();
        }
 
        xdg_toplevel_set_min_size(xdg_toplevel
                , size_pixel_min.width
                , size_pixel_min.height
                );
 
        xdg_toplevel_set_max_size(xdg_toplevel
                , size_pixel_max.width
                , size_pixel_max.height
                );
 
        surface_extent.size_pixel_min = size_pixel_min;
        surface_extent.size_pixel_max = size_pixel_max;
}
 
 
void Yetani::xdgToplevelWindowChange(Yetani* yetani       
        , struct wl_surface*                 wl_surface   
        , Yetani::XdgToplevel&               toplevel     
        , const Yetani::XdgState             window_state 
        , const Yetani::SizePixel&           size_pixel   
        ) noexcept
{
        Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
        Yetani::SizePixel      new_size{1, 1};
 
        toplevel.window_state = window_state;
 
        if((toplevel.window_state == Yetani::XdgState::Toplevel_Window_Fullscreen)
                || (toplevel.window_state == Yetani::XdgState::Toplevel_Window_Maximized)
                )
        {
                if(toplevel.previous_size.width == 0)
                {
                        xdg_toplevel_set_max_size(toplevel.xdg_toplevel, 0, 0);
                        xdg_toplevel_set_min_size(toplevel.xdg_toplevel, 0, 0);
 
                        toplevel.previous_size = surface_extent.size_pixel;
                }
 
                if((size_pixel.width != 0)
                        && (size_pixel.height != 0)
                        )
                {
                        new_size = size_pixel;
                }
        }
        else if(toplevel.window_state == Yetani::XdgState::Toplevel_Window_Normal)
        {
                xdg_toplevel_set_max_size(toplevel.xdg_toplevel
                        , surface_extent.size_pixel_max.width
                        , surface_extent.size_pixel_max.height
                        );
 
                xdg_toplevel_set_min_size(toplevel.xdg_toplevel
                        , surface_extent.size_pixel_min.width
                        , surface_extent.size_pixel_min.height
                        );
 
                new_size = toplevel.previous_size;
                toplevel.previous_size.width = 0;
        }
 
        if(new_size == surface_extent.size_pixel)
        {
                return;
        }
 
        // Calculate Size
        Yetani::SizeMm      size_mm;
        Yetani::SizePercent size_percent;
        yetani->convertPixel(wl_surface
                , size_pixel.width  , size_pixel.height
                , size_mm.width     , size_mm.height
                , size_percent.width, size_percent.height
                );
 
        yetani->surface_resize_mutex_map[wl_surface].lock();
        {
                surface_extent.size_mm      = size_mm;
                surface_extent.size_percent = size_percent;
                surface_extent.size_pixel   = new_size;
                surfaceCalculateSize(yetani, wl_surface, new_size);
        }
        yetani->surface_resize_mutex_map[wl_surface].unlock();
 
        toplevel.window_state_lambda(Yetani::toWindowMode(toplevel.window_state));
 
        Yetani::SurfaceEvent& event = yetani->surface_event_map[wl_surface];
        event.on_size_pixel_change(surface_extent.size_pixel);
        event.on_size_mm_change(surface_extent.size_mm);
        event.on_size_percent_change(surface_extent.size_percent);
}
 
// }}}
// {{{ XDG : Decoration (Unstable)
 
struct zxdg_toplevel_decoration_v1* Yetani::xdgDecorationCreate(struct xdg_surface* xdg_surface  
        , struct xdg_toplevel*                                                      xdg_toplevel 
        ) noexcept
{
        if(decoration_manager == nullptr)
        {
                return nullptr;
        }
 
        /* *** From the xdg-decoration-unstable-v1 documentation ***
         *
         * Creating an xdg_toplevel_decoration from an xdg_toplevel which has a 
         * buffer attached or committed is a client error.
         */
 
        zxdg_toplevel_decoration_v1* xdg_decoration =
                zxdg_decoration_manager_v1_get_toplevel_decoration(decoration_manager
                        , xdg_toplevel
                        );
 
        Yetani::XdgDecoration& decoration = xdg_decoration_map[xdg_surface];
        decoration.state_change = &(xdg_state_change_map[xdg_surface]);
        decoration.lambda       = LambdaWindowDecorations_DoNothing;
        decoration.state        = 0;
        decoration.is_present   = false;
 
        zxdg_toplevel_decoration_v1_add_listener(xdg_decoration
                , &xdg_toplevel_decoration_listener
                , &decoration
                );
 
        return xdg_decoration;
}
 
 
void Yetani::xdgDecorationDestroy(struct xdg_surface* xdg_surface    
        , struct xdg_toplevel*                        //xdg_toplevel   ///< The XDG Toplevel
        , struct zxdg_toplevel_decoration_v1*&        xdg_decoration 
        ) noexcept
{
        zxdg_toplevel_decoration_v1_destroy(xdg_decoration);
 
        if(xdg_decoration_map.contains(xdg_surface))
        {
                Yetani::XdgDecoration& decoration = xdg_decoration_map[xdg_surface];
                decoration.state_change = nullptr;
                decoration.lambda       = nullptr;
                decoration.state        = 0;
                decoration.is_present   = false;
 
                xdg_decoration_map.erase(xdg_surface);
        }
 
        xdg_decoration = nullptr;
}
 
 
void Yetani::xdgDecorationChange(Yetani::XdgDecoration& decoration       
        , const uint32_t                                decoration_state 
        ) noexcept
{
        if(decoration_state == ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE)
        {
                if(decoration.state != decoration_state)
                {
                        decoration.state    = decoration_state;
                        decoration.is_present = false;
 
                        decoration.lambda(
                                Yetani::WindowDecorations::Client_Side
                                );
                }
        }
        else if(decoration_state == ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE)
        {
                if(decoration.state != decoration_state)
                {
                        decoration.state    = decoration_state;
                        decoration.is_present = true;
                }
                else
                {
                        decoration.is_present = !decoration.is_present;
                }
 
                if(decoration.is_present == true)
                {
                        decoration.lambda(
                                Yetani::WindowDecorations::Server_Side
                                );
                }
                else
                {
                        decoration.lambda(
                                Yetani::WindowDecorations::Client_Side
                                );
                }
        }
}
 
// }}}
// {{{ XDG : Listener Handlers : Surface
 
void Yetani::handlerXdgSurfaceConfigure(void* data        
        , xdg_surface*                        xdg_surface 
        , uint32_t                            serial      
        ) noexcept
{
        Yetani::XdgSurface& surface = *((Yetani::XdgSurface*)data);
        Yetani* yetani = surface.yetani;
 
        xdg_surface_ack_configure(xdg_surface, serial);
 
        VectorXdgStateChange& state_change = yetani->xdg_state_change_map[xdg_surface];
 
        if(state_change.empty())
        {
                return;
        }
 
        auto iter = std::begin(state_change);
        auto iter_end = std::end(state_change);
 
        while(iter != iter_end)
        {
                switch(*iter)
                {
                        case Yetani::XdgState::Toplevel_Active:
                        {
                                Yetani::XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
                                iter++;
                                bool is_active = bool(*iter);
                                if(toplevel.is_active != is_active)
                                {
                                        toplevel.is_active = is_active;
 
                                        toplevel.is_active_lambda(is_active);
                                }
                        } break;
 
                        case Yetani::XdgState::Toplevel_Attach_Buffer:
                        {
                                struct wl_surface* wl_surface = surface.wl_surface;
 
                                SurfaceFrame& surface_frame =
                                        yetani->surface_frame_map[wl_surface];
 
                                wl_surface_attach(surface_frame.wl_surface
                                        , surface_frame.buffer_next
                                        , 0, 0
                                        );
 
                                struct wl_callback* callback = wl_surface_frame(surface_frame.wl_surface);
 
                                wl_callback_add_listener(callback
                                        , &frame_callback_listener
                                        , &surface_frame
                                        );
 
                                wl_surface_commit(surface_frame.wl_surface);
                        } break;
 
                        case Yetani::XdgState::Toplevel_Window_Normal:
                        case Yetani::XdgState::Toplevel_Window_Maximized:
                        case Yetani::XdgState::Toplevel_Window_Fullscreen:
                        {
                                struct wl_surface* wl_surface = surface.wl_surface;
 
                                Yetani::XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
                                Yetani::XdgState window_state = XdgState(*iter);
 
                                Yetani::SizePixel size_pixel;
 
                                iter++;
                                size_pixel.width = *iter;
 
                                iter++;
                                size_pixel.height = *iter;
 
                                if(toplevel.window_state != window_state)
                                {
                                        xdgToplevelWindowChange(yetani
                                                , wl_surface
                                                , toplevel
                                                , window_state
                                                , size_pixel
                                                );
                                }
                        } break;
 
                        case Yetani::XdgState::Toplevel_Resizing:
                        {
                                struct wl_surface* wl_surface = surface.wl_surface;
 
                                Yetani::SizePixel size_pixel;
 
                                iter++;
                                size_pixel.width = *iter;
 
                                iter++;
                                size_pixel.height = *iter;
 
                                if(size_pixel.width > 0
                                        && size_pixel.height > 0
                                        )
                                {
                                        xdgToplevelSizeChange(yetani
                                                , wl_surface
                                                , size_pixel
                                                );
                                }
                        } break;
 
                        case Yetani::XdgState::Toplevel_Decoration:
                        {
                                iter++;
                                uint32_t decoration_state = *iter;
 
                                Yetani::XdgDecoration& decoration = yetani->xdg_decoration_map[xdg_surface];
 
                                xdgDecorationChange(decoration, decoration_state);
                        } break;
                }
 
                iter++;
        }
 
        state_change.clear();
}
 
// }}}
// {{{ XDG : Listener Handlers : Toplevel
 
void Yetani::handlerXdgToplevelClose(void* data         
        , struct xdg_toplevel*             //xdg_toplevel ///< The toplevel surface
        ) noexcept
{
        Yetani::XdgToplevel* toplevel = (Yetani::XdgToplevel*)data;
 
        toplevel->close_request_lambda();
}
 
 
void Yetani::handlerXdgToplevelConfigure(void* data         
        , struct xdg_toplevel*                 //xdg_toplevel ///< The toplevel surface
        , int32_t                              width        
        , int32_t                              height       
        , struct wl_array*                     state_array  
        ) noexcept
{
        Yetani::XdgToplevel* toplevel = (Yetani::XdgToplevel*)data;
 
        Yetani::XdgState window_state = Yetani::XdgState::Toplevel_Window_Normal;
        int32_t is_active = 0;
 
        ZAKERO_YETANI__ARRAY_FOR_EACH(xdg_toplevel_state*, state_iter, state_array)
        {
                xdg_toplevel_state state = *state_iter;
 
                switch(state)
                {
                        case XDG_TOPLEVEL_STATE_MAXIMIZED:
                                window_state = Yetani::XdgState::Toplevel_Window_Maximized;
                                break;
                        case XDG_TOPLEVEL_STATE_FULLSCREEN:
                                window_state = Yetani::XdgState::Toplevel_Window_Fullscreen;
                                break;
                        case XDG_TOPLEVEL_STATE_RESIZING:
                                toplevel->state_change->push_back(Yetani::XdgState::Toplevel_Resizing);
                                toplevel->state_change->push_back(width);
                                toplevel->state_change->push_back(height);
                                break;
                        case XDG_TOPLEVEL_STATE_ACTIVATED:
                                is_active = 1;
                                break;
                        case XDG_TOPLEVEL_STATE_TILED_LEFT:
                                break;
                        case XDG_TOPLEVEL_STATE_TILED_RIGHT:
                                break;
                        case XDG_TOPLEVEL_STATE_TILED_TOP:
                                break;
                        case XDG_TOPLEVEL_STATE_TILED_BOTTOM:
                                break;
                        default:
                                break;
                }
        }
 
        toplevel->state_change->push_back(window_state);
        toplevel->state_change->push_back(width);
        toplevel->state_change->push_back(height);
 
        toplevel->state_change->push_back(Yetani::XdgState::Toplevel_Active);
        toplevel->state_change->push_back(is_active);
}
 
// }}}
// {{{ XDG : Listener Handlers : WM Base
 
void Yetani::handlerXdgWmBasePing(void* //data        ///< User data
        , struct xdg_wm_base*           xdg_wm_base 
        , uint32_t                      serial      
        ) noexcept
{
        xdg_wm_base_pong(xdg_wm_base, serial);
}
 
// }}}
// {{{ XDG : Listener Handlers (Unstable) : Decoration
 
void Yetani::handlerXdgToplevelDecorationConfigure(void* data       
        , struct zxdg_toplevel_decoration_v1*            //decoration ///< The Decoration object
        , uint32_t                                       mode       
        ) noexcept
{
        Yetani::XdgDecoration* deco = (Yetani::XdgDecoration*)data;
 
        deco->state_change->push_back(Yetani::XdgState::Toplevel_Decoration);
        deco->state_change->push_back(mode);
}
 
// }}}
// {{{ Window
 
/* Disabled because Doxygen does not support "enum classes"
 *
 * \var Yetani::Client_Side
 * \brief The user app must draw the decorations.
 *
 * \var Yetani::Server_Side
 * \brief The Wayland Compositor will draw the decorations.
 */
 
/* Disabled because Doxygen does not support "enum classes"
 *
 * \var Yetani::Normal
 * \brief A normal window.
 *
 * \var Yetani::Fullscreen
 * \brief A window that uses the entire screen, no borders.
 *
 * \var Yetani::Maximized
 * \brief A window that uses as much of the screen as possible.
 */
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizeMm& size  
        , std::error_code&                                 error 
        ) noexcept
{
        return windowCreate(Yetani::SizeUnit::Millimeter
                , size
                , { 0, 0 }
                , { 0, 0 }
                , SHM_FORMAT_DEFAULT
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizeMm& size   
        , const wl_shm_format                              format 
        ) noexcept
{
        std::error_code error;
 
        return windowCreate(Yetani::SizeUnit::Millimeter
                , size
                , { 0, 0 }
                , { 0, 0 }
                , format
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizeMm& size   
        , const wl_shm_format                              format 
        , std::error_code&                                 error  
        ) noexcept
{
        return windowCreate(Yetani::SizeUnit::Millimeter
                , size
                , { 0, 0 }
                , { 0, 0 }
                , format
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizePercent& size  
        , std::error_code&                                      error 
        ) noexcept
{
        return windowCreate(Yetani::SizeUnit::Percent
                , { 0, 0 }
                , size
                , { 0, 0 }
                , SHM_FORMAT_DEFAULT
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizePercent& size   
        , const wl_shm_format                                   format 
        ) noexcept
{
        std::error_code error;
 
        return windowCreate(Yetani::SizeUnit::Percent
                , { 0, 0 }
                , size
                , { 0, 0 }
                , format
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizePercent& size   
        , const wl_shm_format                                   format 
        , std::error_code&                                      error  
        ) noexcept
{
        return windowCreate(Yetani::SizeUnit::Percent
                , { 0, 0 }
                , size
                , { 0, 0 }
                , format
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizePixel& size  
        , std::error_code&                                    error 
        ) noexcept
{
        return windowCreate(Yetani::SizeUnit::Pixel
                , { 0, 0 }
                , { 0, 0 }
                , size
                , SHM_FORMAT_DEFAULT
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizePixel& size   
        , const wl_shm_format                                 format 
        ) noexcept
{
        std::error_code error;
 
        return windowCreate(Yetani::SizeUnit::Pixel
                , { 0, 0 }
                , { 0, 0 }
                , size
                , format
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizePixel& size   
        , const wl_shm_format                                 format 
        , std::error_code&                                    error  
        ) noexcept
{
        return windowCreate(Yetani::SizeUnit::Pixel
                , { 0, 0 }
                , { 0, 0 }
                , size
                , format
                , error
                );
}
 
 
Yetani::Window* Yetani::windowCreate(const Yetani::SizeUnit size_unit    
        , const Yetani::SizeMm&                             size_mm      
        , const Yetani::SizePercent&                        size_percent 
        , const Yetani::SizePixel&                          size_pixel   
        , const wl_shm_format                               pixel_format 
        , std::error_code&                                  error        
        ) noexcept
{
        if((size_unit == Yetani::SizeUnit::Millimeter)
                && (size_mm.width <= 0 || size_mm.height <= 0)
                )
        {
                error = ZAKERO_YETANI__ERROR(Error_Window_Size_Too_Small);
 
                return nullptr;
        }
 
        if((size_unit == Yetani::SizeUnit::Percent)
                && (size_percent.width <= 0 || size_percent.height <= 0)
                )
        {
                error = ZAKERO_YETANI__ERROR(Error_Window_Size_Too_Small);
 
                return nullptr;
        }
 
        if((size_unit == Yetani::SizeUnit::Pixel)
                && (size_pixel.width <= 0 || size_pixel.height <= 0)
                )
        {
                error = ZAKERO_YETANI__ERROR(Error_Window_Size_Too_Small);
 
                return nullptr;
        }
 
        const std::string file_name = "Zakero.Yetani."
                + std::to_string(ZAKERO_STEADY_TIME_NOW(nanoseconds))
                ;
 
        struct WindowData window_data =
        {       .yetani       = this
        ,       .wl_shm       = shm
        ,       .wl_output    = nullptr
        ,       .file_name    = file_name
        ,       .size_mm      = size_mm
        ,       .size_percent = size_percent
        ,       .size_pixel   = size_pixel
        ,       .size_unit    = size_unit
        ,       .pixel_format = pixel_format
        ,       .error        = ZAKERO_YETANI__ERROR(Error_None)
        };
 
        windowDataInit(window_data);
 
        if(window_data.error)
        {
                error = window_data.error;
 
                return nullptr;
        }
     
        Yetani::Window* window = new Window(&window_data);
 
        if(window_data.error)
        {
                delete window;
                window = nullptr;
 
                ZAKERO_YETANI__DEBUG << to_string(window_data.error) << "\n";
 
                error = ZAKERO_YETANI__ERROR(Error_Window_Initialization_Failed);
 
                return nullptr;
        }
 
        error = ZAKERO_YETANI__ERROR(Error_None);
 
        return window;
}
 
 
void Yetani::windowDataInit(Yetani::WindowData& window_data 
        ) noexcept
{
        windowDataInitOutput(window_data);
 
        if(window_data.error)
        {
                return;
        }
 
        window_data.size_pixel.width  = std::max(1, window_data.size_pixel.width);
        window_data.size_pixel.height = std::max(1, window_data.size_pixel.height);
 
        window_data.error = ZAKERO_YETANI__ERROR(Error_None);
}
 
 
void Yetani::windowDataInitOutput(Yetani::WindowData& window_data 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.output_map.empty())
        {
                window_data.error = ZAKERO_YETANI__ERROR(Error_No_Output_Available);
 
                return;
        }
 
        const auto& iter = output_data.output_map.begin();
 
        window_data.wl_output  = iter->first;
        Yetani::Output& output = iter->second;
 
        if(window_data.size_unit == Yetani::SizeUnit::Millimeter)
        {
                auto px = convertMmToPixel(output
                        , window_data.size_mm.width
                        , window_data.size_mm.height
                        );
 
                auto pc = convertPixelToPercent(output
                        , px.first
                        , px.second
                        );
 
                window_data.size_mm      = window_data.size_mm;
                window_data.size_percent = { pc.first, pc.second };
                window_data.size_pixel   = { px.first, px.second };
        }
        else if(window_data.size_unit == Yetani::SizeUnit::Percent)
        {
                auto px = convertPercentToPixel(output
                        , window_data.size_percent.width
                        , window_data.size_percent.height
                        );
 
                auto mm = convertPixelToMm(output
                        , px.first
                        , px.second
                        );
 
                window_data.size_mm      = { mm.first, mm.second };
                window_data.size_percent = window_data.size_percent;
                window_data.size_pixel   = { px.first, px.second };
        }
        else if(window_data.size_unit == Yetani::SizeUnit::Pixel)
        {
                auto mm = convertPixelToMm(output
                        , window_data.size_pixel.width
                        , window_data.size_pixel.height
                        );
 
                auto pc = convertPixelToPercent(output
                        , window_data.size_pixel.width
                        , window_data.size_pixel.height
                        );
 
                window_data.size_mm      = { mm.first, mm.second };
                window_data.size_percent = { pc.first, pc.second };
                window_data.size_pixel   = window_data.size_pixel;
        }
 
        window_data.error = ZAKERO_YETANI__ERROR(Error_None);
}
 
 
void Yetani::windowInitMemory(Yetani::WindowData& window_data   
        , Yetani::Window::Memory&                 window_memory 
        ) noexcept
{
        size_t size_in_bytes = sizeInBytes(window_data.size_pixel
                , window_data.pixel_format
                ) * 3;
 
        window_data.error = window_memory.memory_pool.init(size_in_bytes
                , true
                , zakero::MemoryPool::Alignment::Bits_32
                );
 
        if(window_data.error)
        {
                return;
        }
 
        window_memory.wl_shm_pool = wl_shm_create_pool(window_data.wl_shm
                , window_memory.memory_pool.fd()
                , window_memory.memory_pool.size()
                );
 
        window_memory.memory_pool.sizeOnChange([&](size_t new_size)
        {
                wl_shm_pool_resize(window_memory.wl_shm_pool, new_size);
        });
 
        window_data.error = ZAKERO_YETANI__ERROR(Error_None);
}
 
 
void Yetani::windowInitOutput(Yetani::WindowData& window_data 
        , struct wl_surface*                      wl_surface  
        ) noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        output_data.surface_output_map[wl_surface].push_back(window_data.wl_output);
}
 
 
void Yetani::windowEraseMemory(Yetani::Window::Memory& window_memory 
        ) noexcept
{
        if(window_memory.wl_shm_pool)
        {
                wl_shm_pool_destroy(window_memory.wl_shm_pool);
                window_memory.wl_shm_pool = nullptr;
        }
}
 
 
void Yetani::windowEraseOutput(struct wl_surface* wl_surface 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        if(output_data.surface_output_map.contains(wl_surface))
        {
                output_data.surface_output_map.erase(wl_surface);
        }
}
 
 
void Yetani::windowEraseSurfaceExtent(struct wl_surface* wl_surface 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(surface_extent_mutex);
 
        if(surface_extent_map.contains(wl_surface))
        {
                surface_extent_map.erase(wl_surface);
        }
}
 
 
void Yetani::windowAdd(Yetani::Window* window 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(window_vector_mutex);
 
        window_vector.push_back(window);
}
 
 
void Yetani::windowRemove(Yetani::Window* window 
        ) noexcept
{
        std::lock_guard<std::mutex> lock(window_vector_mutex);
 
        zakero::vectorErase(window_vector, window);
}
 
// }}}
// {{{ Window : Documentation
 
// }}}
// {{{ Window : Constructor / Destructor
 
Yetani::Window::Window(void* ptr 
        )
        : yetani         {((Yetani::WindowData*)ptr)->yetani}
        , wl_buffer      {nullptr}
        , wl_surface     {nullptr}
        , xdg_surface    {nullptr}
        , xdg_toplevel   {nullptr}
        , xdg_decoration {nullptr}
        , window_memory  {nullptr, ((Yetani::WindowData*)ptr)->file_name}
        , pixel_format   {((Yetani::WindowData*)ptr)->pixel_format}
{
        Yetani::WindowData& window_data = *((Yetani::WindowData*)ptr);
 
        yetani->windowInitMemory(window_data, window_memory);
        if(window_data.error)
        {
                return;
        }
 
        wl_surface = yetani->surfaceCreate(yetani
                , pixel_format
                , window_data.size_pixel
                , window_memory
                );
 
        xdg_surface = yetani->xdgSurfaceCreate(wl_surface);
 
        yetani->xdgSurfaceSetExtent(wl_surface
                , window_data.size_unit
                , window_data.size_mm
                , window_data.size_percent
                , window_data.size_pixel
                );
 
        xdg_toplevel = yetani->xdgToplevelCreate(xdg_surface);
 
        xdg_decoration = yetani->xdgDecorationCreate(xdg_surface, xdg_toplevel);
 
        wl_surface_commit(wl_surface);
 
        yetani->windowInitOutput(window_data, wl_surface);
        if(window_data.error)
        {
                return;
        }
 
        yetani->windowAdd(this);
}
 
 
Yetani::Window::~Window()
{
        yetani->windowRemove(this);
 
        if(xdg_decoration != nullptr)
        {
                yetani->xdgDecorationDestroy(xdg_surface, xdg_toplevel, xdg_decoration);
        }
 
        if(xdg_toplevel != nullptr)
        {
                yetani->xdgToplevelDestroy(xdg_surface, xdg_toplevel);
        }
 
        if(xdg_surface != nullptr)
        {
                yetani->xdgSurfaceDestroy(wl_surface, xdg_surface);
        }
 
        if(wl_surface != nullptr)
        {
                yetani->windowEraseOutput(wl_surface);
                yetani->surfaceDestroy(yetani, wl_surface);
                yetani->windowEraseSurfaceExtent(wl_surface);
        }
 
        yetani->windowEraseMemory(window_memory);
}
 
// }}}
// {{{ Window : Cursor
 
std::error_code Yetani::Window::cursorUse(const std::string& name 
        ) noexcept
{
        if(name.empty())
        {
                return yetani->cursorDetach(wl_surface);
        }
 
        return yetani->cursorAttach(name, wl_surface);
}
 
 
void Yetani::Window::cursorHide() noexcept
{
        yetani->cursorHide(wl_surface);
}
 
 
void Yetani::Window::cursorShow() noexcept
{
        yetani->cursorShow(wl_surface);
}
 
// }}}
// {{{ Window : Settings
 
void Yetani::Window::classSet(const std::string& class_name 
        ) noexcept
{
        xdg_toplevel_set_app_id(xdg_toplevel, class_name.c_str());
}
 
 
void Yetani::Window::titleSet(const std::string& title 
        ) noexcept
{
        xdg_toplevel_set_title(xdg_toplevel, title.c_str());
}
 
 
std::error_code Yetani::Window::decorationsSet(const Yetani::WindowDecorations decorations 
        ) noexcept
{
        if(yetani->decoration_manager == nullptr)
        {
                return ZAKERO_YETANI__ERROR(Error_Server_Side_Decorations_Not_Available);
        }
 
        uint32_t decoration_state = decorations == Yetani::WindowDecorations::Server_Side
                ? ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE
                : ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE
                ;
 
        zxdg_toplevel_decoration_v1_set_mode(xdg_decoration
                , decoration_state
                );
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
Yetani::WindowMode Yetani::Window::windowMode() noexcept
{
        XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
        Yetani::WindowMode window_mode = Yetani::toWindowMode(toplevel.window_state);
 
        return window_mode;
}
 
 
bool Yetani::Window::windowModeIs(const Yetani::WindowMode window_mode 
        ) noexcept
{
        XdgState window_state = Yetani::toXdgState(window_mode);
 
        XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
        if(toplevel.window_state == window_state)
        {
                return true;
        }
 
        return false;
}
 
 
void Yetani::Window::windowModeSet(const Yetani::WindowMode window_mode 
        ) noexcept
{
        XdgState window_state = Yetani::toXdgState(window_mode);
 
        XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
        if(toplevel.window_state == window_state)
        {
                return;
        }
 
        switch(window_mode)
        {
                case WindowMode::Fullscreen:
                        xdg_toplevel_set_fullscreen(xdg_toplevel, nullptr);
                        break;
 
                case WindowMode::Maximized:
                        xdg_toplevel_set_maximized(xdg_toplevel);
                        break;
 
                case WindowMode::Normal:
                        xdg_toplevel_unset_fullscreen(xdg_toplevel);
                        xdg_toplevel_unset_maximized(xdg_toplevel);
                        break;
        }
}
 
 
std::error_code Yetani::Window::sizeSet(const Yetani::SizeMm& size 
        ) noexcept
{
        if(size.width <= 0 || size.height <= 0)
        {
                return ZAKERO_YETANI__ERROR(Error_Window_Size_Too_Small);
        }
 
        Yetani::SizePixel size_pixel = convertToPixel(size);
 
        if(size_pixel.width <= 0)
        {
                size_pixel.width = 1;
        }
 
        if(size_pixel.height <= 0)
        {
                size_pixel.height = 1;
        }
 
        yetani->surface_resize_mutex_map[wl_surface].lock();
        {
                Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
 
                surface_extent.preferred_unit = Yetani::SizeUnit::Millimeter;
                surface_extent.preferred_mm   = size;
                surface_extent.size_pixel     = size_pixel;
 
                surfaceCalculateSize(yetani, wl_surface, size_pixel);
        }
        yetani->surface_resize_mutex_map[wl_surface].unlock();
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
std::error_code Yetani::Window::sizeSet(const Yetani::SizePercent& size 
        ) noexcept
{
        if(size.width <= 0 || size.height <= 0)
        {
                return ZAKERO_YETANI__ERROR(Error_Window_Size_Too_Small);
        }
 
        Yetani::SizePixel size_pixel = convertToPixel(size);
 
        if(size_pixel.width <= 0)
        {
                size_pixel.width = 1;
        }
 
        if(size_pixel.height <= 0)
        {
                size_pixel.height = 1;
        }
 
        yetani->surface_resize_mutex_map[wl_surface].lock();
        {
                Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
 
                surface_extent.preferred_unit    = Yetani::SizeUnit::Percent;
                surface_extent.preferred_percent = size;
                surface_extent.size_pixel        = size_pixel;
 
                surfaceCalculateSize(yetani, wl_surface, size_pixel);
        }
        yetani->surface_resize_mutex_map[wl_surface].unlock();
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
std::error_code Yetani::Window::sizeSet(const Yetani::SizePixel& size 
        ) noexcept
{
        if(size.width <= 0 || size.height <= 0)
        {
                return ZAKERO_YETANI__ERROR(Error_Window_Size_Too_Small);
        }
 
        yetani->surface_resize_mutex_map[wl_surface].lock();
        {
                Yetani::SurfaceExtent& surface_extent = yetani->surface_extent_map[wl_surface];
 
                surface_extent.preferred_unit = Yetani::SizeUnit::Pixel;
                surface_extent.size_pixel     = size;
 
                surfaceCalculateSize(yetani, wl_surface, size);
        }
        yetani->surface_resize_mutex_map[wl_surface].unlock();
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
std::error_code Yetani::Window::sizeSetMinMax(const Yetani::SizeMm& size_min 
        , const Yetani::SizeMm&                                     size_max 
        ) noexcept
{
        std::error_code error = validateMinMax<Yetani::SizeMm>(size_min, size_max);
        if(error)
        {
                return error;
        }
 
        Yetani::SizePixel size_pixel_min;
        Yetani::SizePixel size_pixel_max;
 
        {
                Yetani::OutputData& output_data = yetani->output_data;
 
                std::lock_guard<std::mutex> lock(output_data.mutex);
 
                Yetani::VectorWlOutput& vector    = output_data.surface_output_map[wl_surface];
                struct wl_output*       wl_output = vector.front();
                const Yetani::Output&   output    = output_data.output_map[wl_output];
 
                auto min = yetani->convertMmToPixel(output, size_min.width, size_min.height);
                size_pixel_min = { min.first, min.second };
 
                auto max = yetani->convertMmToPixel(output, size_max.width, size_max.height);
                size_pixel_max = { max.first, max.second };
        }
 
        yetani->xdgToplevelSizeMinMaxChange(yetani
                , xdg_toplevel
                , wl_surface
                , size_pixel_min
                , size_pixel_max
                );
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
std::error_code Yetani::Window::sizeSetMinMax(const Yetani::SizePercent& size_min 
        , const Yetani::SizePercent&                                     size_max 
        ) noexcept
{
        std::error_code error = validateMinMax<Yetani::SizePercent>(size_min, size_max);
        if(error)
        {
                return error;
        }
 
        Yetani::SizePixel size_pixel_min;
        Yetani::SizePixel size_pixel_max;
 
        {
                Yetani::OutputData& output_data = yetani->output_data;
 
                std::lock_guard<std::mutex> lock(output_data.mutex);
 
                Yetani::VectorWlOutput& vector    = output_data.surface_output_map[wl_surface];
                struct wl_output*       wl_output = vector.front();
                const Yetani::Output&   output    = output_data.output_map[wl_output];
 
                auto min = yetani->convertPercentToPixel(output, size_min.width, size_min.height);
                size_pixel_min = { min.first, min.second };
 
                auto max = yetani->convertPercentToPixel(output, size_max.width, size_max.height);
                size_pixel_max = { max.first, max.second };
        }
 
        yetani->xdgToplevelSizeMinMaxChange(yetani
                , xdg_toplevel
                , wl_surface
                , size_pixel_min
                , size_pixel_max
                );
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
std::error_code Yetani::Window::sizeSetMinMax(const Yetani::SizePixel& size_min 
        , const Yetani::SizePixel&                                     size_max 
        ) noexcept
{
        std::error_code error = validateMinMax<Yetani::SizePixel>(size_min, size_max);
        if(error)
        {
                return error;
        }
 
        yetani->xdgToplevelSizeMinMaxChange(yetani
                , xdg_toplevel
                , wl_surface
                , size_min
                , size_max
                );
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
// }}}
// {{{ Window : Rendering
 
std::error_code Yetani::Window::imageNext(uint8_t*& image 
        , Yetani::SizePixel&                        size  
        ) noexcept
{
        if(wl_buffer != nullptr)
        {
                bufferDestroy(wl_buffer);
        }
 
        Yetani::SurfaceSize& surface_size = yetani->surface_size_map[wl_surface];
 
        yetani->surface_resize_mutex_map[wl_surface].lock();
        {
                wl_buffer = bufferCreate(surface_size
                        , &window_memory
                        , &yetani->buffer
                        );
        }
        yetani->surface_resize_mutex_map[wl_surface].unlock();
 
        image = window_memory.memory_pool.addressOf(
                yetani->buffer.map[wl_buffer].offset
                );
 
        size = { surface_size.width, surface_size.height }; 
 
        return ZAKERO_YETANI__ERROR(Error_None);
}
 
 
void Yetani::Window::imagePresent() noexcept
{
        if(wl_buffer == nullptr)
        {
                // This nullptr check is needed because:
                // - If imagePresent() is called before imageNext() then 
                //   wl_buffer could be nullptr.
                // - There is a chance that a valid "buffer_next" can be
                //   replaced with a nullptr, and this will cause a
                //   frame-drop.
 
                return;
        }
 
        Yetani::SurfaceFrame& surface_frame = yetani->surface_frame_map[wl_surface];
 
        wl_buffer = surface_frame.buffer_next.exchange(wl_buffer);
}
 
 
uint32_t Yetani::Window::time() const noexcept
{
        Yetani::SurfaceFrame& surface_frame = yetani->surface_frame_map[wl_surface];
 
        return surface_frame.time_ms;
}
 
// }}}
// {{{ Window : Misc
 
uint8_t Yetani::Window::bytesPerPixel() const noexcept
{
        return yetani->shmFormatBytesPerPixel(pixel_format);
}
 
 
void Yetani::Window::minimize() noexcept
{
        xdg_toplevel_set_minimized(xdg_toplevel);
}
 
// }}}
// {{{ Window : Measurement Conversion
 
Yetani::PointMm Yetani::Window::convertToMm(const Yetani::PointPixel& point 
        ) const noexcept
{
        const Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map.at(wl_surface).front();
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = yetani->convertPixelToMm(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::PointPercent Yetani::Window::convertToPercent(const Yetani::PointPixel& point 
        ) const noexcept
{
        const Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map.at(wl_surface).front();
        const Yetani::Output& output    = output_data.output_map.at(wl_output);
 
        auto p = yetani->convertPixelToPercent(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::PointPixel Yetani::Window::convertToPixel(const Yetani::PointMm& point 
        ) const noexcept
{
        Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map[wl_surface].front();
        const Yetani::Output& output    = output_data.output_map[wl_output];
 
        auto p = yetani->convertMmToPixel(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::PointPixel Yetani::Window::convertToPixel(const Yetani::PointPercent& point 
        ) const noexcept
{
        Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map[wl_surface].front();
        const Yetani::Output& output    = output_data.output_map[wl_output];
 
        auto p = yetani->convertPercentToPixel(output, point.x, point.y);
 
        return { point.time, p.first, p.second };
}
 
 
Yetani::SizeMm Yetani::Window::convertToMm(const Yetani::SizePixel& size 
        ) const noexcept
{
        Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map[wl_surface].front();
        const Yetani::Output& output    = output_data.output_map[wl_output];
 
        auto p = yetani->convertPixelToMm(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
 
Yetani::SizePercent Yetani::Window::convertToPercent(const Yetani::SizePixel& size 
        ) const noexcept
{
        Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map[wl_surface].front();
        const Yetani::Output& output    = output_data.output_map[wl_output];
 
        auto p = yetani->convertPixelToPercent(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
 
Yetani::SizePixel Yetani::Window::convertToPixel(const Yetani::SizeMm& size 
        ) const noexcept
{
        Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map[wl_surface].front();
        const Yetani::Output& output    = output_data.output_map[wl_output];
 
        auto p = yetani->convertMmToPixel(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
 
Yetani::SizePixel Yetani::Window::convertToPixel(const Yetani::SizePercent& size 
        ) const noexcept
{
        Yetani::OutputData& output_data = yetani->output_data;
 
        std::lock_guard<std::mutex> lock(output_data.mutex);
 
        struct wl_output*     wl_output = output_data.surface_output_map[wl_surface].front();
        const Yetani::Output& output    = output_data.output_map[wl_output];
 
        auto p = yetani->convertPercentToPixel(output, size.width, size.height);
 
        return { p.first, p.second };
}
 
// }}}
// {{{ Window : Event Handling
 
void Yetani::Window::onCloseRequest(Yetani::Lambda lambda 
        ) noexcept
{
        XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
        if(lambda == nullptr)
        {
                toplevel.close_request_lambda = Lambda_DoNothing;
        }
        else
        {
                toplevel.close_request_lambda = lambda;
        }
}
 
 
void Yetani::Window::decorationsOnChange(Yetani::LambdaWindowDecorations lambda 
        ) noexcept
{
        XdgDecoration& decoration = yetani->xdg_decoration_map[xdg_surface];
 
        if(lambda == nullptr)
        {
                decoration.lambda = LambdaWindowDecorations_DoNothing;
        }
        else
        {
                decoration.lambda = lambda;
        }
}
 
 
void Yetani::Window::onFocusChange(Yetani::LambdaBool lambda 
        ) noexcept
{
        XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
        if(lambda == nullptr)
        {
                toplevel.is_active_lambda = LambdaBool_DoNothing;
        }
        else
        {
                toplevel.is_active_lambda = lambda;
        }
}
 
 
void Yetani::Window::keyboardOnEnter(Yetani::Lambda lambda 
        ) noexcept
{
        if(yetani->keyboard.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::KeyboardEvent& event = yetani->keyboard.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_enter = Lambda_DoNothing;
        }
        else
        {
                event.on_enter = lambda;
        }
}
 
 
void Yetani::Window::keyboardOnLeave(Yetani::Lambda lambda 
        ) noexcept
{
        if(yetani->keyboard.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::KeyboardEvent& event = yetani->keyboard.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_leave = Lambda_DoNothing;
        }
        else
        {
                event.on_leave = lambda;
        }
}
 
 
void Yetani::Window::keyboardOnKey(Yetani::LambdaKey lambda 
        ) noexcept
{
        if(yetani->keyboard.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::KeyboardEvent& event = yetani->keyboard.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_key = LambdaKey_DoNothing;
        }
        else
        {
                event.on_key = lambda;
        }
}
 
 
void Yetani::Window::windowModeOnChange(Yetani::LambdaWindowMode lambda 
        ) noexcept
{
        XdgToplevel& toplevel = yetani->xdg_toplevel_map[xdg_surface];
 
        if(lambda == nullptr)
        {
                toplevel.window_state_lambda = LambdaWindowMode_DoNothing;
        }
        else
        {
                toplevel.window_state_lambda = lambda;
        }
}
 
 
void Yetani::Window::sizeOnChange(Yetani::LambdaSizeMm lambda 
        ) noexcept
{
        Yetani::SurfaceEvent& event = yetani->surface_event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_size_mm_change = LambdaSizeMm_DoNothing;
        }
        else
        {
                event.on_size_mm_change = lambda;
        }
}
 
 
void Yetani::Window::sizeOnChange(Yetani::LambdaSizePercent lambda 
        ) noexcept
{
        Yetani::SurfaceEvent& event = yetani->surface_event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_size_percent_change = LambdaSizePercent_DoNothing;
        }
        else
        {
                event.on_size_percent_change = lambda;
        }
}
 
 
void Yetani::Window::sizeOnChange(Yetani::LambdaSizePixel lambda 
        ) noexcept
{
        Yetani::SurfaceEvent& event = yetani->surface_event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_size_pixel_change = LambdaSizePixel_DoNothing;
        }
        else
        {
                event.on_size_pixel_change = lambda;
        }
}
 
 
void Yetani::Window::pointerOnButton(Yetani::LambdaButtonMm lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_button_mm = LambdaButtonMm_DoNothing;
        }
        else
        {
                event.on_button_mm = lambda;
        }
}
 
 
void Yetani::Window::pointerOnButton(Yetani::LambdaButtonPercent lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_button_percent = LambdaButtonPercent_DoNothing;
        }
        else
        {
                event.on_button_percent = lambda;
        }
}
 
 
void Yetani::Window::pointerOnButton(Yetani::LambdaButtonPixel lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_button_pixel = LambdaButtonPixel_DoNothing;
        }
        else
        {
                event.on_button_pixel = lambda;
        }
}
 
 
void Yetani::Window::pointerOnEnter(Yetani::LambdaPointMm lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_enter_mm = LambdaPointMm_DoNothing;
        }
        else
        {
                event.on_enter_mm = lambda;
        }
}
 
 
void Yetani::Window::pointerOnEnter(Yetani::LambdaPointPercent lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_enter_percent = LambdaPointPercent_DoNothing;
        }
        else
        {
                event.on_enter_percent = lambda;
        }
}
 
 
void Yetani::Window::pointerOnEnter(Yetani::LambdaPointPixel lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_enter_pixel = LambdaPointPixel_DoNothing;
        }
        else
        {
                event.on_enter_pixel = lambda;
        }
}
 
 
void Yetani::Window::pointerOnLeave(Yetani::Lambda lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_leave = Lambda_DoNothing;
        }
        else
        {
                event.on_leave = lambda;
        }
}
 
 
void Yetani::Window::pointerOnMotion(Yetani::LambdaPointMm lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_motion_mm = LambdaPointMm_DoNothing;
        }
        else
        {
                event.on_motion_mm = lambda;
        }
}
 
 
void Yetani::Window::pointerOnMotion(Yetani::LambdaPointPercent lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_motion_percent = LambdaPointPercent_DoNothing;
        }
        else
        {
                event.on_motion_percent = lambda;
        }
}
 
 
void Yetani::Window::pointerOnMotion(Yetani::LambdaPointPixel lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_motion_pixel = LambdaPointPixel_DoNothing;
        }
        else
        {
                event.on_motion_pixel = lambda;
        }
}
 
 
void Yetani::Window::pointerOnAxis(Yetani::LambdaAxis lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_axis = LambdaAxis_DoNothing;
        }
        else
        {
                event.on_axis = lambda;
        }
}
 
 
void Yetani::Window::pointerOnAxisSource(Yetani::Lambda lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_axis_source = Lambda_DoNothing;
        }
        else
        {
                event.on_axis_source = lambda;
        }
}
 
 
void Yetani::Window::pointerOnAxisStop(Yetani::Lambda lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_axis_stop = Lambda_DoNothing;
        }
        else
        {
                event.on_axis_stop = lambda;
        }
}
 
 
void Yetani::Window::pointerOnAxisDiscrete(Yetani::Lambda lambda 
        ) noexcept
{
        if(yetani->pointer.event_map.contains(wl_surface) == false)
        {
                return;
        }
 
        Yetani::PointerEvent& event = yetani->pointer.event_map[wl_surface];
 
        if(lambda == nullptr)
        {
                event.on_axis_discrete = Lambda_DoNothing;
        }
        else
        {
                event.on_axis_discrete = lambda;
        }
}
 
// }}}
// {{{ Window : Helpers
 
 
// }}}
// {{{ Convenience
 
std::string to_string(const wl_shm_format& shm_format 
        ) noexcept
{
        return Yetani::shmFormatName(shm_format);
}
 
 
std::string to_string(const Yetani::Key& key 
        ) noexcept
{
        return std::string()
                + "{ \"time\": "    + std::to_string(key.time)
                + ", \"code\": "    + std::to_string(key.code)
                + ", \"state\": \"" + zakero::to_string(key.state) + "\""
                + " }";
}
 
 
std::string to_string(const Yetani::KeyModifier& key_modifier 
        ) noexcept
{
        auto mod_to_str = [](std::string& s, uint32_t m)
        {
                s += "[";
                std::string delim = "";
 
                if(m & Yetani::KeyModifier_Shift)
                {
                        s += delim + "\"Shift\"";
                        delim = ",";
                }
 
                if(m & Yetani::KeyModifier_CapsLock)
                {
                        s += delim + "\"CapsLock\"";
                        delim = ",";
                }
 
                if(m & Yetani::KeyModifier_Control)
                {
                        s += delim + "\"Control\"";
                        delim = ",";
                }
 
                if(m & Yetani::KeyModifier_Alt)
                {
                        s += delim + "\"Alt\"";
                        delim = ",";
                }
 
                if(m & Yetani::KeyModifier_NumLock)
                {
                        s += delim + "\"NumLock\"";
                }
 
                if(m & Yetani::KeyModifier_Meta)
                {
                        s += delim + "\"Meta\"";
                }
 
                s += "]";
        };
 
        std::string str = "{ \"pressed\": ";
        mod_to_str(str, key_modifier.pressed);
 
        str += ", \"latched\": ";
        mod_to_str(str, key_modifier.latched);
 
        str += ", \"locked\": ";
        mod_to_str(str, key_modifier.locked);
 
        str += " }";
 
        return str;
}
 
 
std::string to_string(const Yetani::KeyState& key_state 
        ) noexcept
{
        switch(key_state)
        {
                case Yetani::KeyState::Pressed:  return "Pressed";
                case Yetani::KeyState::Released: return "Released";
                case Yetani::KeyState::Repeat:   return "Repeat";
                default:                         return "";
        }
}
 
 
std::string to_string(const Yetani::Output& output 
        ) noexcept
{
        return std::string()
                + "{ \"x\": "                        + std::to_string(output.x)
                + ", \"y\": "                        + std::to_string(output.y)
                + ", \"physical_width_mm\": "        + std::to_string(output.physical_width_mm)
                + ", \"physical_height_mm\": "       + std::to_string(output.physical_height_mm)
                + ", \"subpixel\": "                 + std::to_string(output.subpixel)
                + ", \"subpixel_name\": \""          + Yetani::outputSubpixelName(output.subpixel) + "\""
                + ", \"make\": \""                   + output.make + "\""
                + ", \"model\": \""                  + output.model + "\""
                + ", \"transform\": "                + std::to_string(output.transform)
                + ", \"transform_name\": \""         + Yetani::outputTransformName(output.transform) + "\""
                + ", \"flags\": "                    + std::to_string(output.flags)
                + ", \"width\": "                    + std::to_string(output.width)
                + ", \"height\": "                   + std::to_string(output.height)
                + ", \"refresh_mHz\": "              + std::to_string(output.refresh_mHz)
                + ", \"scale_factor\": "             + std::to_string(output.scale_factor)
                + ", \"pixels_per_mm_horizontal\": " + std::to_string(output.pixels_per_mm_horizontal)
                + ", \"pixels_per_mm_vertical\": "   + std::to_string(output.pixels_per_mm_vertical)
                + " }";
}
 
 
std::string to_string(const Yetani::PointMm& point 
        ) noexcept
{
        return std::string()
                + "{ \"time\": " + std::to_string(point.time)
                + ", \"x\": "    + std::to_string(point.x)
                + ", \"y\": "    + std::to_string(point.y)
                + " }";
}
 
 
std::string to_string(const Yetani::PointPercent& point 
        ) noexcept
{
        return std::string()
                + "{ \"time\": " + std::to_string(point.time)
                + ", \"x\": "    + std::to_string(point.x)
                + ", \"y\": "    + std::to_string(point.y)
                + " }";
}
 
 
std::string to_string(const Yetani::PointPixel& point 
        ) noexcept
{
        return std::string()
                + "{ \"time\": " + std::to_string(point.time)
                + ", \"x\": "    + std::to_string(point.x)
                + ", \"y\": "    + std::to_string(point.y)
                + " }";
}
 
 
std::string to_string(const Yetani::PointerAxis& axis 
        ) noexcept
{
        return std::string()
                + "{ \"time\": "     + std::to_string(axis.time)
                + ", \"steps\": "    + std::to_string(axis.steps)
                + ", \"distance\": " + std::to_string(axis.distance)
                + ", \"source\": "   + zakero::to_string(axis.source)
                + ", \"type\": "     + zakero::to_string(axis.type)
                + " }";
}
 
 
std::string to_string(const Yetani::PointerAxisSource& source 
        ) noexcept
{
        switch(source)
        {
                case Yetani::PointerAxisSource::Continuous: return "Continuous";
                case Yetani::PointerAxisSource::Finger:     return "Finger";
                case Yetani::PointerAxisSource::Wheel:      return "Wheel";
                case Yetani::PointerAxisSource::Wheel_Tilt: return "Wheel Tilt";
                case Yetani::PointerAxisSource::Unknown:    [[fallthrough]];
                default:                                    return "";
        }
}
 
 
std::string to_string(const Yetani::PointerAxisType& type 
        ) noexcept
{
        switch(type)
        {
                case Yetani::PointerAxisType::Horizontal: return "Horizontal";
                case Yetani::PointerAxisType::Vertical:   return "Vertical";
                case Yetani::PointerAxisType::Unknown:    [[fallthrough]];
                default:                                  return "";
        }
}
 
 
std::string to_string(const Yetani::PointerButton& button 
        ) noexcept
{
        return std::string()
                + "{ \"code\": " + std::to_string(button.code)
                + ", \"state\": " + zakero::to_string(button.state)
                + " }";
}
 
 
std::string to_string(const Yetani::PointerButtonState& button_state 
        ) noexcept
{
        switch(button_state)
        {
                case Yetani::PointerButtonState::Pressed:  return "Pressed";
                case Yetani::PointerButtonState::Released: return "Released";
                default:                                   return "";
        }
}
 
 
std::string to_string(const Yetani::SizeMm& size 
        ) noexcept
{
        return std::string()
                + "{ \"width\": "  + std::to_string(size.width)
                + ", \"height\": " + std::to_string(size.height)
                + " }";
}
 
 
std::string to_string(const Yetani::SizePercent& size 
        ) noexcept
{
        return std::string()
                + "{ \"width\": "  + std::to_string(size.width)
                + ", \"height\": " + std::to_string(size.height)
                + " }";
}
 
 
std::string to_string(const Yetani::SizePixel& size 
        ) noexcept
{
        return std::string()
                + "{ \"width\": "  + std::to_string(size.width)
                + ", \"height\": " + std::to_string(size.height)
                + " }";
}
 
 
std::string to_string(const Yetani::WindowMode& window_mode 
        ) noexcept
{
        switch(window_mode)
        {
                case Yetani::WindowMode::Fullscreen: return "Fullscreen";
                case Yetani::WindowMode::Maximized:  return "Maximized";
                case Yetani::WindowMode::Normal:     return "Normal";
                default:                             return "";
        }
}
 
 
bool operator==(Yetani::PointMm& lhs 
        , Yetani::PointMm&       rhs 
        ) noexcept
{
        return zakero::equalish(lhs.x, rhs.x, 0.001)
                &&  zakero::equalish(lhs.y, rhs.y, 0.001)
                ;
}
 
 
bool operator==(Yetani::PointPercent& lhs 
        , Yetani::PointPercent&       rhs 
        ) noexcept
{
        return zakero::equalish(lhs.x, rhs.x, 0.00001)
                &&  zakero::equalish(lhs.y, rhs.y, 0.00001)
                ;
}
 
 
bool operator==(Yetani::PointPixel& lhs 
        , Yetani::PointPixel&       rhs 
        ) noexcept
{
        return (lhs.x == rhs.x) && (lhs.y == rhs.y);
}
 
 
bool operator==(Yetani::SizeMm& lhs 
        , Yetani::SizeMm&       rhs 
        ) noexcept
{
        return zakero::equalish(lhs.width, rhs.width, 0.001)
                &&  zakero::equalish(lhs.height, rhs.height, 0.001)
                ;
}
 
 
bool operator==(Yetani::SizePercent& lhs 
        , Yetani::SizePercent&       rhs 
        ) noexcept
{
        return zakero::equalish(lhs.width, rhs.width, 0.00001)
                &&  zakero::equalish(lhs.height, rhs.height, 0.00001)
                ;
}
 
 
bool operator==(Yetani::SizePixel& lhs 
        , Yetani::SizePixel&       rhs 
        ) noexcept
{
        return (lhs.width == rhs.width) && (lhs.height == rhs.height);
}
 
// }}}
 
}
 
#endif // ZAKERO_YETANI_IMPLEMENTATION
 
// }}}
 
#endif // zakero_Yetani_h