/* Definitions and headers for communication with X protocol.
   Copyright (C) 1989, 1993-1994, 1998-2022 Free Software Foundation,
   Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */

#ifndef XTERM_H
#define XTERM_H

#include <X11/Xlib.h>
#include <X11/cursorfont.h>

/* Include Xutil.h after keysym.h to work around a bug that prevents
   correct recognition of AltGr key in some X versions.  */

#include <X11/keysym.h>
#include <X11/Xutil.h>

#include <X11/Xatom.h>
#include <X11/Xresource.h>

#ifdef HAVE_XINPUT2
#include <X11/extensions/XInput2.h>
#endif

#ifdef USE_X_TOOLKIT
#include <X11/StringDefs.h>
#include <X11/IntrinsicP.h>	/* CoreP.h needs this */
#include <X11/CoreP.h>		/* foul, but we need this to use our own
				   window inside a widget instead of one
				   that Xt creates... */
#ifdef X_TOOLKIT_EDITRES
#include <X11/Xmu/Editres.h>
#endif

typedef Widget xt_or_gtk_widget;
#endif

#ifdef USE_GTK
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#endif /* USE_GTK */

#ifndef USE_GTK
#define GTK_CHECK_VERSION(i, j, k) false
#endif

#ifdef HAVE_XRENDER
#include <X11/extensions/Xrender.h>
#endif

#ifdef USE_GTK
/* Some definitions to reduce conditionals.  */
typedef GtkWidget *xt_or_gtk_widget;
#undef XSync
/* gdk_window_process_all_updates is deprecated in GDK 3.22.  */
#if GTK_CHECK_VERSION (3, 22, 0)
#define XSync(d, b) do { XSync ((d), (b)); } while (false)
#else
#define XSync(d, b) do { gdk_window_process_all_updates (); \
                         XSync (d, b);  } while (false)
#endif
#endif /* USE_GTK */

/* Number of "failable requests" to store.  */
#define N_FAILABLE_REQUESTS 128

#ifdef USE_CAIRO
#include <cairo-xlib.h>
#ifdef CAIRO_HAS_PDF_SURFACE
#include <cairo-pdf.h>
#endif
#ifdef CAIRO_HAS_PS_SURFACE
#include <cairo-ps.h>
#endif
#ifdef CAIRO_HAS_SVG_SURFACE
#include <cairo-svg.h>
#endif
#ifdef USE_CAIRO_XCB
#include <cairo-xcb.h>
#endif
#endif

#ifdef HAVE_X_I18N
#include <X11/Xlocale.h>
#endif

#ifdef USE_XCB
#include <X11/Xlib-xcb.h>
#endif

#ifdef HAVE_XKB
#include <X11/XKBlib.h>
#endif

#ifdef HAVE_XSYNC
#include <X11/extensions/sync.h>
#endif

#include "dispextern.h"
#include "termhooks.h"

INLINE_HEADER_BEGIN

/* Black and white pixel values for the screen which frame F is on.  */
#define BLACK_PIX_DEFAULT(f)					\
  BlackPixel (FRAME_X_DISPLAY (f), FRAME_X_SCREEN_NUMBER (f))
#define WHITE_PIX_DEFAULT(f)					\
  WhitePixel (FRAME_X_DISPLAY (f), FRAME_X_SCREEN_NUMBER (f))

/* The mask of events that text windows always want to receive.  This
   includes mouse movement events, since handling the mouse-font text property
   means that we must track mouse motion all the time.  */

#define STANDARD_EVENT_SET      \
  (KeyPressMask			\
   | ExposureMask		\
   | ButtonPressMask		\
   | ButtonReleaseMask		\
   | PointerMotionMask		\
   | StructureNotifyMask	\
   | FocusChangeMask		\
   | LeaveWindowMask		\
   | EnterWindowMask		\
   | PropertyChangeMask		\
   | VisibilityChangeMask)

#ifdef HAVE_X11R6_XIM
/* Data structure passed to xim_instantiate_callback.  */
struct xim_inst_t
{
  struct x_display_info *dpyinfo;
  char *resource_name;
};
#endif /* HAVE_X11R6_XIM */

#ifdef HAVE_XINPUT2
#if HAVE_XISCROLLCLASSINFO_TYPE && defined XIScrollClass
#define HAVE_XINPUT2_1
#endif
#if HAVE_XITOUCHCLASSINFO_TYPE && defined XITouchClass
#define HAVE_XINPUT2_2
#endif
#if HAVE_XIBARRIERRELEASEPOINTERINFO_DEVICEID && defined XIBarrierPointerReleased
#define HAVE_XINPUT2_3
#endif
#if HAVE_XIGESTURECLASSINFO_TYPE && defined XIGestureClass
#define HAVE_XINPUT2_4
#endif
#endif

/* Structure recording X pixmap and reference count.
   If REFCOUNT is 0 then this record is free to be reused.  */

struct x_bitmap_record
{
#ifdef USE_CAIRO
  cairo_pattern_t *stipple;
#endif
  Pixmap pixmap;
  bool have_mask;
  Pixmap mask;
  char *file;
  int refcount;
  /* Record some info about this pixmap.  */
  int height, width, depth;
};
\f
#if defined USE_CAIRO || defined HAVE_XRENDER
struct x_gc_ext_data
{
#define MAX_CLIP_RECTS 2
  /* Number of clipping rectangles.  */
  int n_clip_rects;

  /* Clipping rectangles.  */
  XRectangle clip_rects[MAX_CLIP_RECTS];
};
#endif

#ifdef USE_CAIRO
extern cairo_pattern_t *x_bitmap_stipple (struct frame *, Pixmap);
#endif

\f
struct color_name_cache_entry
{
  struct color_name_cache_entry *next;

  /* The color values of the cached color entry.  */
  XColor rgb;

  /* The name of the cached color.  */
  char *name;

  /* Whether or not RGB is valid (i.e. the color actually exists).  */
  bool_bf valid : 1;
};

#ifdef HAVE_XINPUT2

#ifdef HAVE_XINPUT2_1

struct xi_scroll_valuator_t
{
  /* The ID of the valuator.  */
  int number;

  /* Whether or not it represents X axis movement.  */
  bool_bf horizontal : 1;

  /* Whether or not the value is currently invalid.  */
  bool_bf invalid_p : 1;

  /* The current value.  */
  double current_value;

  /* Value used to tally up deltas until a threshold is met.  */
  double emacs_value;

  /* The scroll increment.  */
  double increment;
};

#endif

#ifdef HAVE_XINPUT2_2

struct xi_touch_point_t
{
  struct xi_touch_point_t *next;

  int number;
  double x, y;
};

#endif

struct xi_device_t
{
  /* The numerical ID of this device.  */
  int device_id;

#ifdef HAVE_XINPUT2_1
  /* The number of scroll valuators in `valuators'.  */
  int scroll_valuator_count;
#endif

  /* Whether or not the device is grabbed and its use.  */
  int grab, use;

  /* The attached device.  Only valid if USE is some kind of master
     device.  */
  int attachment;

#ifdef HAVE_XINPUT2_2
  /* Whether or not this device is a direct touch device.  */
  bool direct_p;
#endif

#ifdef HAVE_XINPUT2_1
  /* An array of scroll valuators Emacs knows about.  */
  struct xi_scroll_valuator_t *valuators;
#endif

#ifdef HAVE_XINPUT2_2
  /* An array of in-progress touchscreen events.  */
  struct xi_touch_point_t *touchpoints;
#endif

  /* The name of this device.  */
  Lisp_Object name;

  /* The time at which `focus_frame' became the keyboard focus (only
     applies to master devices).  */
  Time focus_frame_time;

  /* The frame that is currently this device's keyboard focus, or
     NULL.  */
  struct frame *focus_frame;

  /* The time at which `focus_frame' became the implicit keyboard
     focus.  */
  Time focus_implicit_time;

  /* The frame that is currently this device's implicit keyboard
     focus, or NULL.  */
  struct frame *focus_implicit_frame;

  /* The window on which the last motion event happened.  */
  Window last_motion_window;

  /* The rounded integer coordinates of the last motion event.  */
  int last_motion_x, last_motion_y;
};
#endif

extern Status x_parse_color (struct frame *, const char *, XColor *);

struct x_failable_request
{
  /* The first request making up this sequence.  */
  unsigned long start;

  /* If this is zero, then the request has not yet been made.
     Otherwise, this is the request that ends this sequence.  */
  unsigned long end;
};

#ifdef HAVE_XFIXES

struct x_monitored_selection
{
  /* The name of the selection.  */
  Atom name;

  /* The current owner of the selection.  */
  Window owner;
};

/* An invalid window.  */
#define X_INVALID_WINDOW 0xffffffff

#endif

\f
/* For each X display, we have a structure that records
   information about it.  */

struct x_display_info
{
  /* Chain of all x_display_info structures.  */
  struct x_display_info *next;

  /* The generic display parameters corresponding to this X display. */
  struct terminal *terminal;

  /* This says how to access this display in Xlib.  */
  Display *display;

  /* A connection number (file descriptor) for the display.  */
  int connection;

  /* This is a cons cell of the form (NAME . FONT-LIST-CACHE).  */
  Lisp_Object name_list_element;

  /* Number of frames that are on this display.  */
  int reference_count;

  /* The Screen this connection is connected to.  */
  Screen *screen;

  /* Dots per inch of the screen.  */
  double resx, resy;

  /* The Visual being used for this display.  */
  Visual *visual;

  /* The visual information corresponding to VISUAL.  */
  XVisualInfo visual_info;

#ifdef HAVE_XRENDER
  /* The picture format for this display.  */
  XRenderPictFormat *pict_format;
#endif

  /* The colormap being used.  */
  Colormap cmap;

  /* Number of planes on this screen.  */
  int n_planes;

  /* Mask of things that cause the mouse to be grabbed.  */
  int grabbed;

  /* Emacs bitmap-id of the default icon bitmap for this frame.
     Or -1 if none has been allocated yet.  */
  ptrdiff_t icon_bitmap_id;

  /* The root window of this screen.  */
  Window root_window;

  /* Client leader window.  */
  Window client_leader_window;

  /* The cursor to use for vertical scroll bars.  */
  Cursor vertical_scroll_bar_cursor;

  /* The cursor to use for horizontal scroll bars.  */
  Cursor horizontal_scroll_bar_cursor;

  /* The invisible cursor used for pointer blanking.
     Unused if this display supports Xfixes extension.  */
  Cursor invisible_cursor;

#ifdef HAVE_XFIXES
  /* Whether or not to use Xfixes for pointer blanking.  */
  bool fixes_pointer_blanking;
#endif

#ifdef USE_GTK
  /* The GDK cursor for scroll bars and popup menus.  */
  GdkCursor *xg_cursor;
#endif

  /* X Resource data base */
  XrmDatabase rdb;

  /* Minimum width over all characters in all fonts in font_table.  */
  int smallest_char_width;

  /* Minimum font height over all fonts in font_table.  */
  int smallest_font_height;

  /* Reusable Graphics Context for drawing a cursor in a non-default face. */
  GC scratch_cursor_gc;

  /* Information about the range of text currently shown in
     mouse-face.  */
  Mouse_HLInfo mouse_highlight;

  /* Logical identifier of this display.  */
  unsigned x_id;

  /* Default name for all frames on this display.  */
  char *x_id_name;

  /* The number of fonts opened for this display.  */
  int n_fonts;

  /* Pointer to bitmap records.  */
  struct x_bitmap_record *bitmaps;

  /* Allocated size of bitmaps field.  */
  ptrdiff_t bitmaps_size;

  /* Last used bitmap index.  */
  ptrdiff_t bitmaps_last;

  /* Which modifier keys are on which modifier bits?

     With each keystroke, X returns eight bits indicating which modifier
     keys were held down when the key was pressed.  The interpretation
     of the top five modifier bits depends on what keys are attached
     to them.  If the Meta_L and Meta_R keysyms are on mod5, then mod5
     is the meta bit.

     meta_mod_mask is a mask containing the bits used for the meta key.
     It may have more than one bit set, if more than one modifier bit
     has meta keys on it.  Basically, if EVENT is a KeyPress event,
     the meta key is pressed if (EVENT.state & meta_mod_mask) != 0.

     shift_lock_mask is LockMask if the XK_Shift_Lock keysym is on the
     lock modifier bit, or zero otherwise.  Non-alphabetic keys should
     only be affected by the lock modifier bit if XK_Shift_Lock is in
     use; XK_Caps_Lock should only affect alphabetic keys.  With this
     arrangement, the lock modifier should shift the character if
     (EVENT.state & shift_lock_mask) != 0.  */
  unsigned int meta_mod_mask, shift_lock_mask;

  /* These are like meta_mod_mask, but for different modifiers.  */
  unsigned alt_mod_mask, super_mod_mask, hyper_mod_mask;

  /* Communication with window managers.  */
  Atom Xatom_wm_protocols;

  /* Kinds of protocol things we may receive.  */
  Atom Xatom_wm_take_focus;
  Atom Xatom_wm_save_yourself;
  Atom Xatom_wm_delete_window;

  /* Atom for indicating window state to the window manager.  */
  Atom Xatom_wm_change_state;
  Atom Xatom_wm_state;

  /* Other WM communication */
  Atom Xatom_wm_configure_denied; /* When our config request is denied */
  Atom Xatom_wm_window_moved;     /* When the WM moves us.  */
  Atom Xatom_wm_client_leader;    /* Id of client leader window.  */
  Atom Xatom_wm_transient_for;    /* Id of whatever window we are
				     transient for. */

  /* EditRes protocol */
  Atom Xatom_editres;

  /* More atoms, which are selection types.  */
  Atom Xatom_CLIPBOARD, Xatom_TIMESTAMP, Xatom_TEXT, Xatom_DELETE,
    Xatom_COMPOUND_TEXT, Xatom_UTF8_STRING,
    Xatom_MULTIPLE, Xatom_INCR, Xatom_EMACS_TMP, Xatom_TARGETS, Xatom_NULL,
    Xatom_ATOM, Xatom_ATOM_PAIR, Xatom_CLIPBOARD_MANAGER,
    Xatom_EMACS_SERVER_TIME_PROP;

  /* More atoms for font properties.  The last three are private
     properties, see the comments in src/fontset.h.  */
  Atom Xatom_PIXEL_SIZE, Xatom_AVERAGE_WIDTH,
    Xatom_MULE_BASELINE_OFFSET, Xatom_MULE_RELATIVE_COMPOSE,
    Xatom_MULE_DEFAULT_ASCENT;

  /* More atoms for Ghostscript support.  */
  Atom Xatom_DONE, Xatom_PAGE;

  /* Atoms used in toolkit scroll bar client messages.  */
  Atom Xatom_Scrollbar, Xatom_Horizontal_Scrollbar;

  /* Atom used in XEmbed client messages.  */
  Atom Xatom_XEMBED, Xatom_XEMBED_INFO;

  /* Atom used to determine whether or not the screen is composited.  */
  Atom Xatom_NET_WM_CM_Sn;

  /* Atoms used by the Motif drag and drop protocols.  */
  Atom Xatom_MOTIF_WM_HINTS, Xatom_MOTIF_DRAG_WINDOW,
    Xatom_MOTIF_DRAG_TARGETS, Xatom_MOTIF_DRAG_AND_DROP_MESSAGE,
    Xatom_MOTIF_DRAG_INITIATOR_INFO, Xatom_MOTIF_DRAG_RECEIVER_INFO;

  /* Atoms used by Emacs internally.  */
  Atom Xatom_EMACS_DRAG_ATOM;

  /* Special selections used by the Motif drop protocol to indicate
     success or failure.  */
  Atom Xatom_XmTRANSFER_SUCCESS, Xatom_XmTRANSFER_FAILURE;

  /* Atoms used by both versions of the OffiX DND protocol (the "old
     KDE" protocol in x-dnd.el). */
  Atom Xatom_DndProtocol, Xatom_DND_PROTOCOL;

  /* The frame (if any) which has the X window that has keyboard focus.
     Zero if none.  This is examined by Ffocus_frame in xfns.c.  Note
     that a mere EnterNotify event can set this; if you need to know the
     last frame specified in a FocusIn or FocusOut event, use
     x_focus_event_frame.  */
  struct frame *x_focus_frame;

  /* The last frame mentioned in a FocusIn or FocusOut event.  This is
     separate from x_focus_frame, because whether or not LeaveNotify
     events cause us to lose focus depends on whether or not we have
     received a FocusIn event for it.

     This field is not used when the input extension is being
     utilized.  */
  struct frame *x_focus_event_frame;

  /* The frame which currently has the visual highlight, and should get
     keyboard input (other sorts of input have the frame encoded in the
     event).  It points to the X focus frame's selected window's
     frame.  It differs from x_focus_frame when we're using a global
     minibuffer.  */
  struct frame *highlight_frame;

  /* The frame waiting to be auto-raised in XTread_socket.  */
  struct frame *x_pending_autoraise_frame;

  /* The frame where the mouse was last time we reported a ButtonPress event.  */
  struct frame *last_mouse_frame;

  /* The frame where the mouse was last time we reported a mouse position.  */
  struct frame *last_mouse_glyph_frame;

  /* The frame where the mouse was last time we reported a mouse motion.  */
  struct frame *last_mouse_motion_frame;

  /* The scroll bar in which the last X motion event occurred.  */
  struct scroll_bar *last_mouse_scroll_bar;

  /* Time of last user interaction as returned in X events on this
     display.  */
  Time last_user_time;

  /* Position where the mouse was last time we reported a motion.
     This is a position on last_mouse_motion_frame.  It is used in
     some situations to report the mouse position as well: see
     XTmouse_position.  */
  int last_mouse_motion_x;
  int last_mouse_motion_y;

  /* Where the mouse was last time we reported a mouse position.
     This is a rectangle on last_mouse_glyph_frame.  */
  XRectangle last_mouse_glyph;

  /* Time of last mouse movement on this display.  This is a hack because
     we would really prefer that XTmouse_position would return the time
     associated with the position it returns, but there doesn't seem to be
     any way to wrest the time-stamp from the server along with the position
     query.  So, we just keep track of the time of the last movement we
     received, and return that in hopes that it's somewhat accurate.  */
  Time last_mouse_movement_time;

  /* Whether or not the last mouse motion was synthetic.  */
  bool last_mouse_movement_time_send_event;

  /* The gray pixmap.  */
  Pixmap gray;

#ifdef HAVE_X_I18N
  /* XIM (X Input method).  */
  XIM xim;
  XIMStyles *xim_styles;
  struct xim_inst_t *xim_callback_data;
  XIMStyle preferred_xim_style;

  /* The named coding system to use for this input method.  */
  Lisp_Object xim_coding;
#endif

  /* A cache mapping color names to RGB values.  */
  struct color_name_cache_entry **color_names;

  /* The number of buckets for each hash in that hash table.  */
  ptrdiff_t *color_names_length;

  /* The size of that hash table.  */
  int color_names_size;

  /* If non-null, a cache of the colors in the color map.  Don't
     use this directly, call x_color_cells instead.  */
  XColor *color_cells;
  int ncolor_cells;

  /* Bits and shifts to use to compose pixel values on TrueColor visuals.  */
  int red_bits, blue_bits, green_bits, alpha_bits;
  int red_offset, blue_offset, green_offset, alpha_offset;
  unsigned long alpha_mask;

  /* The type of window manager we have.  If we move FRAME_OUTER_WINDOW
     to x/y 0/0, some window managers (type A) puts the window manager
     decorations outside the screen and FRAME_OUTER_WINDOW exactly at 0/0.
     Other window managers (type B) puts the window including decorations
     at 0/0, so FRAME_OUTER_WINDOW is a bit below 0/0.
     Record the type of WM in use so we can compensate for type A WMs.  */
  enum
    {
      X_WMTYPE_UNKNOWN,
      X_WMTYPE_A,
      X_WMTYPE_B
    } wm_type;


  /* Atoms that are drag and drop atoms */
  Atom *x_dnd_atoms;
  ptrdiff_t x_dnd_atoms_size;
  ptrdiff_t x_dnd_atoms_length;

  /* The unique drag and drop atom used on Motif.  None if it was not
     already computed.  */
  Atom motif_drag_atom;

  /* Its name.  */
  char motif_drag_atom_name[sizeof "_EMACS_ATOM_%lu" - 3
			    + INT_STRLEN_BOUND (unsigned long)];

  /* When it was owned.  */
  Time motif_drag_atom_time;

  /* The frame that currently owns `motif_drag_atom'.  */
  struct frame *motif_drag_atom_owner;

  /* The drag window for this display.  */
  Window motif_drag_window;

  /* Extended window manager hints, Atoms supported by the window manager and
     atoms for setting the window type.  */
  Atom Xatom_net_supported, Xatom_net_supporting_wm_check;
  Atom *net_supported_atoms;
  int nr_net_supported_atoms;
  Window net_supported_window;
  Atom Xatom_net_window_type, Xatom_net_window_type_tooltip;
  Atom Xatom_net_active_window;

  /* Atoms dealing with EWMH (i.e. _NET_...) */
  Atom Xatom_net_wm_state, Xatom_net_wm_state_fullscreen,
    Xatom_net_wm_state_maximized_horz, Xatom_net_wm_state_maximized_vert,
    Xatom_net_wm_state_sticky, Xatom_net_wm_state_above, Xatom_net_wm_state_below,
    Xatom_net_wm_state_hidden, Xatom_net_wm_state_skip_taskbar,
    Xatom_net_wm_state_shaded, Xatom_net_frame_extents, Xatom_net_current_desktop,
    Xatom_net_workarea, Xatom_net_wm_opaque_region, Xatom_net_wm_ping,
    Xatom_net_wm_sync_request, Xatom_net_wm_sync_request_counter,
    Xatom_net_wm_sync_fences, Xatom_net_wm_frame_drawn, Xatom_net_wm_frame_timings,
    Xatom_net_wm_user_time, Xatom_net_wm_user_time_window,
    Xatom_net_client_list_stacking, Xatom_net_wm_pid,
    Xatom_net_wm_bypass_compositor;

  /* XSettings atoms and windows.  */
  Atom Xatom_xsettings_sel, Xatom_xsettings_prop, Xatom_xsettings_mgr;
  Window xsettings_window;

  /* Frame name and icon name */
  Atom Xatom_net_wm_name, Xatom_net_wm_icon_name;
  /* Frame opacity */
  Atom Xatom_net_wm_window_opacity;

  /* SM */
  Atom Xatom_SM_CLIENT_ID;

  /* DND source.  */
  Atom Xatom_XdndAware, Xatom_XdndSelection, Xatom_XdndTypeList,
    Xatom_XdndActionCopy, Xatom_XdndActionMove, Xatom_XdndActionLink,
    Xatom_XdndActionAsk, Xatom_XdndActionPrivate, Xatom_XdndActionList,
    Xatom_XdndActionDescription, Xatom_XdndProxy, Xatom_XdndEnter,
    Xatom_XdndPosition, Xatom_XdndStatus, Xatom_XdndLeave, Xatom_XdndDrop,
    Xatom_XdndFinished;

  /* XDS source and target.  */
  Atom Xatom_XdndDirectSave0, Xatom_XdndActionDirectSave, Xatom_text_plain;

#ifdef HAVE_XKB
  /* Virtual modifiers */
  Atom Xatom_Meta, Xatom_Super, Xatom_Hyper, Xatom_ShiftLock, Xatom_Alt;
#endif

  /* Core modifier map when XKB is not present.  */
  XModifierKeymap *modmap;

#ifdef HAVE_XRANDR
  bool xrandr_supported_p;
  int xrandr_event_base;
  int xrandr_error_base;
  int xrandr_major_version;
  int xrandr_minor_version;
#endif

#if defined HAVE_XRANDR || defined USE_GTK
  /* This is used to determine if the monitor configuration really
     changed upon receiving a monitor change event.  */
  Lisp_Object last_monitor_attributes_list;
#endif

#if defined USE_CAIRO || defined HAVE_XRENDER
  XExtCodes *ext_codes;
#endif

#ifdef USE_XCB
  xcb_connection_t *xcb_connection;
  xcb_visualtype_t *xcb_visual;
#endif

#ifdef HAVE_XDBE
  bool supports_xdbe;
#endif

#ifdef HAVE_XINPUT2
  bool supports_xi2;

  /* The minor version of the input extension.  (Major is always
     2.x.) */
  int xi2_version;

  /* The generic event opcode of XI2 events.  */
  int xi2_opcode;

  /* The number of devices on this display known to Emacs.  */
  int num_devices;

  /* Array of all input extension devices on this display known to
     Emacs.  */
  struct xi_device_t *devices;

  /* Pending keystroke time.  */
  Time pending_keystroke_time;

  /* Pending keystroke source.  If a core KeyPress event arrives with
     the same timestamp as pending_keystroke_time, it will be treated
     as originating from this device.  */
  int pending_keystroke_source;

#if defined USE_GTK && !defined HAVE_GTK3
  /* This means the two variables above shouldn't be reset the first
     time a KeyPress event arrives, since they were set from a raw key
     press event that was sent before the first (real, not sent by an
     input method) core key event.  */
  bool pending_keystroke_time_special_p;
#endif

  /* The client pointer.  We keep a record client-side to avoid
     calling XISetClientPointer all the time.  */
  int client_pointer_device;
#endif

#ifdef HAVE_XKB
  bool supports_xkb;
  int xkb_event_type;
  XkbDescPtr xkb_desc;
#endif

#ifdef USE_GTK
  bool prefer_native_input;
#endif

#ifdef HAVE_XRENDER
  bool xrender_supported_p;
  int xrender_major;
  int xrender_minor;
#endif

#ifdef HAVE_XFIXES
  bool xfixes_supported_p;
  int xfixes_major;
  int xfixes_minor;
  int xfixes_event_base;
#endif

#ifdef HAVE_XSYNC
  bool xsync_supported_p;
  int xsync_major;
  int xsync_minor;
#endif

#ifdef HAVE_XINERAMA
  bool xinerama_supported_p;
#endif

#ifdef HAVE_XCOMPOSITE
  bool composite_supported_p;
  int composite_major;
  int composite_minor;
#endif

#ifdef HAVE_XSHAPE
  bool xshape_supported_p;
  int xshape_major;
  int xshape_minor;
  int xshape_event_base;
  int xshape_error_base;
#endif

#ifdef USE_TOOLKIT_SCROLL_BARS
  Lisp_Object *protected_windows;
  int n_protected_windows;
  int protected_windows_max;
#endif

  /* The current dimensions of the screen.  This is updated when a
     ConfigureNotify is received for the root window, and is zero if
     that didn't happen.  */
  int screen_width;
  int screen_height;

  /* The mm width and height of the screen.  Updated on
     RRScreenChangeNotify.  */
  int screen_mm_width;
  int screen_mm_height;

  /* Circular buffer of request serial ranges to ignore inside an
     error handler in increasing order.  */
  struct x_failable_request failable_requests[N_FAILABLE_REQUESTS];

  /* Pointer to the next request in `failable_requests'.  */
  struct x_failable_request *next_failable_request;

#ifdef HAVE_XFIXES
  /* Array of selections being monitored and their owners.  */
  struct x_monitored_selection *monitored_selections;

  /* Window used to monitor those selections.  */
  Window selection_tracking_window;

  /* The number of those selections.  */
  int n_monitored_selections;
#endif

  /* The pending drag-and-drop time for middle-click based
     drag-and-drop emulation.  */
  Time pending_dnd_time;

#if defined HAVE_XSYNC && !defined USE_GTK && defined HAVE_CLOCK_GETTIME
  /* Whether or not the server time is probably the same as
     "clock_gettime (CLOCK_MONOTONIC, ...)".  */
  bool server_time_monotonic_p;

  /* The time difference between the X server clock and the monotonic
     clock, or 0 if unknown (if the difference is legitimately 0,
     server_time_monotonic_p will be true).  */
  int_fast64_t server_time_offset;
#endif
};

#ifdef HAVE_X_I18N
/* Whether or not to use XIM if we have it.  */
extern bool use_xim;
#endif

#ifdef HAVE_XINPUT2
/* Defined in xmenu.c. */
extern int popup_activated_flag;
#endif

/* This is a chain of structures for all the X displays currently in use.  */
extern struct x_display_info *x_display_list;

extern struct x_display_info *x_display_info_for_display (Display *);
extern struct frame *x_top_window_to_frame (struct x_display_info *, int);
extern struct x_display_info *x_term_init (Lisp_Object, char *, char *);
extern bool x_display_ok (const char *);

extern void select_visual (struct x_display_info *);

extern Window tip_window;
extern Lisp_Object tip_dx;
extern Lisp_Object tip_dy;
extern Lisp_Object tip_frame;

/* Each X frame object points to its own struct x_output object
   in the output_data.x field.  The x_output structure contains
   the information that is specific to X windows.  */

struct x_output
{
#if defined (USE_X_TOOLKIT) || defined (USE_GTK)
  /* Height of menu bar widget, in pixels.  This value
     is not meaningful if the menubar is turned off.  */
  int menubar_height;
#endif

  /* Height of tool bar widget, in pixels.  top_height is used if tool bar
     at top, bottom_height if tool bar is at the bottom.
     Zero if not using an external tool bar or if tool bar is vertical.  */
  int toolbar_top_height, toolbar_bottom_height;

  /* Width of tool bar widget, in pixels.  left_width is used if tool bar
     at left, right_width if tool bar is at the right.
     Zero if not using an external tool bar or if tool bar is horizontal.  */
  int toolbar_left_width, toolbar_right_width;

  /* The tiled border used when the mouse is out of the frame.  */
  Pixmap border_tile;

  /* Here are the Graphics Contexts for the default font.  */
  GC normal_gc;				/* Normal video */
  GC reverse_gc;			/* Reverse video */
  GC cursor_gc;				/* cursor drawing */

  /* The X window used for this frame.
     May be zero while the frame object is being created
     and the X window has not yet been created.  */
  Window window_desc;

  /* The drawable to which we're rendering.  In the single-buffered
     base, the window itself.  In the double-buffered case, the
     window's back buffer.  */
  Drawable draw_desc;

#ifdef HAVE_XRENDER
  /* The Xrender picture that corresponds to this drawable.  None
     means no picture format was found, or the Xrender extension is
     not present.  */
  Picture picture;
#endif

  /* The X window used for the bitmap icon;
     or 0 if we don't have a bitmap icon.  */
  Window icon_desc;

  /* The X window that is the parent of this X window.
     Usually this is a window that was made by the window manager,
     but it can be the root window, and it can be explicitly specified
     (see the explicit_parent field, below).  */
  Window parent_desc;

#ifdef USE_X_TOOLKIT
  /* The widget of this screen.  This is the window of a "shell" widget.  */
  Widget widget;
  /* The XmPanedWindows...  */
  Widget column_widget;
  /* The widget of the edit portion of this screen; the window in
     "window_desc" is inside of this.  */
  Widget edit_widget;

  Widget menubar_widget;
#endif

#ifndef USE_GTK
  /* A window used to store the user time property.  May be None or
     the frame's outer window.  */
  Window user_time_window;
#endif

#ifdef USE_GTK
  /* The widget of this screen.  This is the window of a top widget.  */
  GtkWidget *widget;
  /* The widget of the edit portion of this screen; the window in
     "window_desc" is inside of this.  */
  GtkWidget *edit_widget;
  /* The widget used for laying out widgets vertically.  */
  GtkWidget *vbox_widget;
  /* The widget used for laying out widgets horizontally.  */
  GtkWidget *hbox_widget;
  /* The menubar in this frame.  */
  GtkWidget *menubar_widget;
  /* The tool bar in this frame  */
  GtkWidget *toolbar_widget;
  /* True if tool bar is packed into the hbox widget (i.e. vertical).  */
  bool_bf toolbar_in_hbox : 1;
  bool_bf toolbar_is_packed : 1;

  /* The last size hints set.  */
  GdkGeometry size_hints;
  long hint_flags;

  GtkTooltip *ttip_widget;
  GtkWidget *ttip_lbl;
  GtkWindow *ttip_window;

  GtkIMContext *im_context;

#ifdef HAVE_GTK3
  /* The CSS providers used for scroll bar foreground and background
     colors.  */
  GtkCssProvider *scrollbar_foreground_css_provider;
  GtkCssProvider *scrollbar_background_css_provider;
#endif
#endif /* USE_GTK */

  /* If >=0, a bitmap index.  The indicated bitmap is used for the
     icon. */
  ptrdiff_t icon_bitmap;

  /* Default ASCII font of this frame.  */
  struct font *font;

  /* The baseline offset of the default ASCII font.  */
  int baseline_offset;

  /* If a fontset is specified for this frame instead of font, this
     value contains an ID of the fontset, else -1.  */
  int fontset;

  unsigned long cursor_pixel;
  unsigned long border_pixel;
  unsigned long mouse_pixel;
  unsigned long cursor_foreground_pixel;

  /* Foreground color for scroll bars.  A value of -1 means use the
     default (black for non-toolkit scroll bars).  */
  unsigned long scroll_bar_foreground_pixel;

  /* Background color for scroll bars.  A value of -1 means use the
     default (background color of the frame for non-toolkit scroll
     bars).  */
  unsigned long scroll_bar_background_pixel;

#if defined (USE_LUCID) && defined (USE_TOOLKIT_SCROLL_BARS)
  /* Top and bottom shadow colors for 3D Lucid scrollbars.
     -1 means let the scroll compute them itself.  */
  unsigned long scroll_bar_top_shadow_pixel;
  unsigned long scroll_bar_bottom_shadow_pixel;
#endif

  /* Descriptor for the cursor in use for this window.  */
  Cursor text_cursor;
  Cursor nontext_cursor;
  Cursor modeline_cursor;
  Cursor hand_cursor;
  Cursor hourglass_cursor;
  Cursor horizontal_drag_cursor;
  Cursor vertical_drag_cursor;
  Cursor current_cursor;
  Cursor left_edge_cursor;
  Cursor top_left_corner_cursor;
  Cursor top_edge_cursor;
  Cursor top_right_corner_cursor;
  Cursor right_edge_cursor;
  Cursor bottom_right_corner_cursor;
  Cursor bottom_edge_cursor;
  Cursor bottom_left_corner_cursor;

  /* Window whose cursor is hourglass_cursor.  This window is temporarily
     mapped to display an hourglass cursor.  */
  Window hourglass_window;

  /* These are the current window manager hints.  It seems that
     XSetWMHints, when presented with an unset bit in the `flags'
     member of the hints structure, does not leave the corresponding
     attribute unchanged; rather, it resets that attribute to its
     default value.  For example, unless you set the `icon_pixmap'
     field and the `IconPixmapHint' bit, XSetWMHints will forget what
     your icon pixmap was.  This is rather troublesome, since some of
     the members (for example, `input' and `icon_pixmap') want to stay
     the same throughout the execution of Emacs.  So, we keep this
     structure around, just leaving values in it and adding new bits
     to the mask as we go.  */
  XWMHints wm_hints;

  /* This is the Emacs structure for the X display this frame is on.  */
  struct x_display_info *display_info;

  /* This is a button event that wants to activate the menubar.
     We save it here until the command loop gets to think about it.  */
  XEvent *saved_menu_event;

  /* This is the widget id used for this frame's menubar in lwlib.  */
#ifdef USE_X_TOOLKIT
  int id;
#endif

  /* True means hourglass cursor is currently displayed.  */
  bool_bf hourglass_p : 1;

  /* True means our parent is another application's window
     and was explicitly specified.  */
  bool_bf explicit_parent : 1;

  /* True means tried already to make this frame visible.  */
  bool_bf asked_for_visible : 1;

  /* True if this frame was ever previously visible.  */
  bool_bf has_been_visible : 1;

  /* Xt waits for a ConfigureNotify event from the window manager in
     EmacsFrameSetCharSize when the shell widget is resized.  For some
     window managers like fvwm2 2.2.5 and KDE 2.1 this event doesn't
     arrive for an unknown reason and Emacs hangs in Xt.  If this is
     false, tell Xt not to wait.  */
  bool_bf wait_for_wm : 1;

  /* True if this frame's alpha value is the same for both the active
     and inactive states.  */
  bool_bf alpha_identical_p : 1;

#ifdef HAVE_XDBE
  /* Flag that indicates whether we've modified the back buffer and
     need to publish our modifications to the front buffer at a
     convenient time.  */
  bool_bf need_buffer_flip : 1;

  /* Flag that indicates whether or not the frame contents are
     complete and can be safely flushed while handling async
     input.  */
  bool_bf complete : 1;
#endif

#ifdef HAVE_X_I18N
  /* Input context (currently, this means Compose key handler setup).  */
  XIC xic;
  XIMStyle xic_style;
  XFontSet xic_xfs;
#endif

#ifdef HAVE_XSYNC
  /* The "basic frame counter" used for resize synchronization.  */
  XSyncCounter basic_frame_counter;

  /* The "extended frame counter" used for frame synchronization.  */
  XSyncCounter extended_frame_counter;

  /* The pending value of the basic counter.  */
  XSyncValue pending_basic_counter_value;

  /* The current value of the extended counter.  */
  XSyncValue current_extended_counter_value;

  /* The configure event value of the extended counter.  */
  XSyncValue resize_counter_value;

  /* Whether or not basic resize synchronization is in progress.  */
  bool_bf sync_end_pending_p : 1;

  /* Whether or not extended resize synchronization is in
     progress.  */
  bool_bf ext_sync_end_pending_p : 1;

#ifdef HAVE_GTK3
  /* Whether or not GDK resize synchronization is in progress.  */
  bool_bf xg_sync_end_pending_p : 1;
#endif

  /* Whether or Emacs is waiting for the compositing manager to draw a
     frame.  */
  bool_bf waiting_for_frame_p : 1;

  /* Whether or not Emacs just skipped waiting for a frame due to a
     timeout.  */
  bool_bf draw_just_hung_p : 1;

#if !defined USE_GTK && defined HAVE_CLOCK_GETTIME
  /* Whether or not Emacs should wait for the compositing manager to
     draw frames before starting a new frame.  */
  bool_bf use_vsync_p : 1;

  /* The time (in microseconds) it took to draw the last frame.  */
  uint_fast64_t last_frame_time;

  /* A temporary time used to calculate that value.  */
  uint_fast64_t temp_frame_time;

#ifdef HAVE_XSYNCTRIGGERFENCE
  /* An array of two sync fences that are triggered in order after a
     frame completes.  Not initialized if the XSync extension is too
     old to support sync fences.  */
  XSyncFence sync_fences[2];
#endif
#endif
#endif

  /* Relief GCs, colors etc.  */
  struct relief
  {
    GC gc;
    unsigned long pixel;
  }
  black_relief, white_relief;

  /* The background for which the above relief GCs were set up.
     They are changed only when a different background is involved.  */
  unsigned long relief_background;

  /* Keep track of focus.  May be EXPLICIT if we received a FocusIn for this
     frame, or IMPLICIT if we received an EnterNotify.
     FocusOut and LeaveNotify clears EXPLICIT/IMPLICIT.

     Not used when the input extension is being utilized.  */
  int focus_state;

  /* The offset we need to add to compensate for type A WMs.  */
  int move_offset_top;
  int move_offset_left;

/* Extreme 'short' and 'long' values suitable for libX11.  */
#define X_SHRT_MAX 0x7fff
#define X_SHRT_MIN (-1 - X_SHRT_MAX)
#define X_LONG_MAX 0x7fffffff
#define X_LONG_MIN (-1 - X_LONG_MAX)
#define X_ULONG_MAX 0xffffffffUL

#ifdef USE_CAIRO
  /* Cairo drawing context.  */
  cairo_t *cr_context;
  /* Width and height reported by the last ConfigureNotify event.
     They are used when creating the cairo surface next time.  */
  int cr_surface_desired_width, cr_surface_desired_height;
#endif

#ifdef HAVE_X_I18N
  ptrdiff_t preedit_size;
  char *preedit_chars;
  bool preedit_active;
  int preedit_caret;
#endif

#ifdef HAVE_XINPUT2
  XIEventMask *xi_masks;
  int num_xi_masks;
#endif

  /* Whether or not we are certain we know the offset from the root
     window to this frame.  */
  bool window_offset_certain_p;

  /* The offset of the edit window from the root window.  This is
     strictly an optimization to avoid extraneous synchronizing in
     some cases.  */
  int root_x, root_y;
};

enum
{
  /* Values for focus_state, used as bit mask.
     EXPLICIT means we received a FocusIn for the frame and know it has
     the focus.  IMPLICIT means we received an EnterNotify and the frame
     may have the focus if no window manager is running.
     FocusOut and LeaveNotify clears EXPLICIT/IMPLICIT. */
  FOCUS_NONE     = 0,
  FOCUS_IMPLICIT = 1,
  FOCUS_EXPLICIT = 2
};

/* Return the X output data for frame F.  */
#define FRAME_X_OUTPUT(f) ((f)->output_data.x)
#define FRAME_OUTPUT_DATA(f) FRAME_X_OUTPUT (f)

/* Return the X window used for displaying data in frame F.  */
#define FRAME_X_WINDOW(f) ((f)->output_data.x->window_desc)
#define FRAME_NATIVE_WINDOW(f) FRAME_X_WINDOW (f)

/* Return the drawable used for rendering to frame F.  */
#define FRAME_X_RAW_DRAWABLE(f) ((f)->output_data.x->draw_desc)

extern void x_mark_frame_dirty (struct frame *f);

/* Return the drawable used for rendering to frame F and mark the
   frame as needing a buffer flip later.  There's no easy way to run
   code after any drawing command, but we can run code whenever
   someone asks for the handle necessary to draw.  */
#define FRAME_X_DRAWABLE(f)                             \
  (x_mark_frame_dirty ((f)), FRAME_X_RAW_DRAWABLE ((f)))

#ifdef HAVE_XDBE
#define FRAME_X_DOUBLE_BUFFERED_P(f)            \
  (FRAME_X_WINDOW (f) != FRAME_X_RAW_DRAWABLE (f))

/* Return the need-buffer-flip flag for frame F.  */
#define FRAME_X_NEED_BUFFER_FLIP(f) ((f)->output_data.x->need_buffer_flip)

/* Return whether or not the frame F has been completely drawn.  Used
   while handling async input.  */
#define FRAME_X_COMPLETE_P(f) ((f)->output_data.x->complete)
#endif

/* Return the outermost X window associated with the frame F.  */
#ifdef USE_X_TOOLKIT
#define FRAME_OUTER_WINDOW(f) ((f)->output_data.x->widget ?             \
                               XtWindow ((f)->output_data.x->widget) :  \
                               FRAME_X_WINDOW (f))
#else
#ifdef USE_GTK

#ifdef HAVE_GTK3
#define DEFAULT_GDK_DISPLAY() \
  gdk_x11_display_get_xdisplay (gdk_display_get_default ())
#else
#undef GDK_WINDOW_XID
#define GDK_WINDOW_XID(w) GDK_WINDOW_XWINDOW (w)
#define DEFAULT_GDK_DISPLAY() GDK_DISPLAY ()
#define gtk_widget_get_preferred_size(a, ign, b) \
  gtk_widget_size_request (a, b)
#endif

#define GTK_WIDGET_TO_X_WIN(w) \
  ((w) && gtk_widget_get_window (w) \
   ? GDK_WINDOW_XID (gtk_widget_get_window (w)) : 0)

#define FRAME_GTK_OUTER_WIDGET(f) ((f)->output_data.x->widget)
#define FRAME_GTK_WIDGET(f) ((f)->output_data.x->edit_widget)
#define FRAME_OUTER_WINDOW(f)                                   \
       (FRAME_GTK_OUTER_WIDGET (f) ?                            \
        GTK_WIDGET_TO_X_WIN (FRAME_GTK_OUTER_WIDGET (f)) :      \
         FRAME_X_WINDOW (f))

#else /* !USE_GTK */
#define FRAME_OUTER_WINDOW(f) (FRAME_X_WINDOW (f))
#endif /* !USE_GTK */
#endif

#if defined (USE_X_TOOLKIT) || defined (USE_GTK)
#define FRAME_MENUBAR_HEIGHT(f) ((f)->output_data.x->menubar_height)
#else
#define FRAME_MENUBAR_HEIGHT(f) ((void) f, 0)
#endif /* USE_X_TOOLKIT || USE_GTK */

#define FRAME_FONT(f) ((f)->output_data.x->font)
#define FRAME_FONTSET(f) ((f)->output_data.x->fontset)
#define FRAME_TOOLBAR_TOP_HEIGHT(f) ((f)->output_data.x->toolbar_top_height)
#define FRAME_TOOLBAR_BOTTOM_HEIGHT(f) \
  ((f)->output_data.x->toolbar_bottom_height)
#define FRAME_TOOLBAR_HEIGHT(f) \
  (FRAME_TOOLBAR_TOP_HEIGHT (f) + FRAME_TOOLBAR_BOTTOM_HEIGHT (f))
#define FRAME_TOOLBAR_LEFT_WIDTH(f) ((f)->output_data.x->toolbar_left_width)
#define FRAME_TOOLBAR_RIGHT_WIDTH(f) ((f)->output_data.x->toolbar_right_width)
#define FRAME_TOOLBAR_WIDTH(f) \
  (FRAME_TOOLBAR_LEFT_WIDTH (f) + FRAME_TOOLBAR_RIGHT_WIDTH (f))
#define FRAME_BASELINE_OFFSET(f) ((f)->output_data.x->baseline_offset)

/* This gives the x_display_info structure for the display F is on.  */
#define FRAME_DISPLAY_INFO(f) ((f)->output_data.x->display_info)

/* This is the `Display *' which frame F is on.  */
#define FRAME_X_DISPLAY(f) (FRAME_DISPLAY_INFO (f)->display)

/* This is the `Screen *' which frame F is on.  */
#define FRAME_X_SCREEN(f) (FRAME_DISPLAY_INFO (f)->screen)

/* This is the screen index number of screen which frame F is on.  */
#define FRAME_X_SCREEN_NUMBER(f) XScreenNumberOfScreen (FRAME_X_SCREEN (f))

/* This is the Visual which frame F is on.  */
#define FRAME_X_VISUAL(f) FRAME_DISPLAY_INFO (f)->visual

/* And its corresponding visual info.  */
#define FRAME_X_VISUAL_INFO(f) (&FRAME_DISPLAY_INFO (f)->visual_info)

#ifdef HAVE_XRENDER
#define FRAME_X_PICTURE_FORMAT(f) FRAME_DISPLAY_INFO (f)->pict_format
#define FRAME_X_PICTURE(f) ((f)->output_data.x->picture)
#define FRAME_CHECK_XR_VERSION(f, major, minor)			\
  (FRAME_DISPLAY_INFO (f)->xrender_supported_p			\
   && ((FRAME_DISPLAY_INFO (f)->xrender_major == (major)	\
	&& FRAME_DISPLAY_INFO (f)->xrender_minor >= (minor))	\
       || (FRAME_DISPLAY_INFO (f)->xrender_major > (major))))
#endif

#ifdef HAVE_XSYNC
#define FRAME_X_BASIC_COUNTER(f)		\
  FRAME_X_OUTPUT (f)->basic_frame_counter
#define FRAME_X_EXTENDED_COUNTER(f)		\
  FRAME_X_OUTPUT (f)->extended_frame_counter
#define FRAME_X_WAITING_FOR_DRAW(f)		\
  FRAME_X_OUTPUT (f)->waiting_for_frame_p
#define FRAME_X_DRAW_JUST_HUNG(f)		\
  FRAME_X_OUTPUT (f)->draw_just_hung_p
#define FRAME_X_COUNTER_VALUE(f)		\
  FRAME_X_OUTPUT (f)->current_extended_counter_value
#endif

/* This is the Colormap which frame F uses.  */
#define FRAME_X_COLORMAP(f) FRAME_DISPLAY_INFO (f)->cmap

#define FRAME_XIC(f) ((f)->output_data.x->xic)
#define FRAME_X_XIM(f) (FRAME_DISPLAY_INFO (f)->xim)
#define FRAME_X_XIM_STYLES(f) (FRAME_DISPLAY_INFO (f)->xim_styles)
#define FRAME_XIC_STYLE(f) ((f)->output_data.x->xic_style)
#define FRAME_XIC_FONTSET(f) ((f)->output_data.x->xic_xfs)
#define FRAME_X_XIM_CODING(f)				\
  (SYMBOLP (Vx_input_coding_system)			\
   ? Vx_input_coding_system				\
   : (!NILP (FRAME_DISPLAY_INFO (f)->xim_coding)	\
      ? FRAME_DISPLAY_INFO(f)->xim_coding		\
      : Vlocale_coding_system))

/* X-specific scroll bar stuff.  */

/* We represent scroll bars as lisp vectors.  This allows us to place
   references to them in windows without worrying about whether we'll
   end up with windows referring to dead scroll bars; the garbage
   collector will free it when its time comes.

   We use struct scroll_bar as a template for accessing fields of the
   vector.  */

struct scroll_bar
{
  /* These fields are shared by all vectors.  */
  union vectorlike_header header;

  /* The window we're a scroll bar for.  */
  Lisp_Object window;

  /* The next and previous in the chain of scroll bars in this frame.  */
  Lisp_Object next, prev;

  /* Fields after 'prev' are not traced by the GC.  */

  /* The X window representing this scroll bar.  */
  Window x_window;

  /* The position and size of the scroll bar in pixels, relative to the
     frame.  */
  int top, left, width, height;

  /* The starting and ending positions of the handle, relative to the
     handle area (i.e. zero is the top position, not
     SCROLL_BAR_TOP_BORDER).  If they're equal, that means the handle
     hasn't been drawn yet.

     These are not actually the locations where the beginning and end
     are drawn; in order to keep handles from becoming invisible when
     editing large files, we establish a minimum height by always
     drawing handle bottoms VERTICAL_SCROLL_BAR_MIN_HANDLE pixels below
     where they would be normally; the bottom and top are in a
     different coordinate system.  */
  int start, end;

  /* If the scroll bar handle is currently being dragged by the user,
     this is the number of pixels from the top of the handle to the
     place where the user grabbed it.  If the handle isn't currently
     being dragged, this is -1.  */
  int dragging;

#if defined (USE_TOOLKIT_SCROLL_BARS) && defined (USE_LUCID)
  /* Last scroll bar part seen in xaw_jump_callback and xaw_scroll_callback.  */
  enum scroll_bar_part last_seen_part;
#endif

#if defined (USE_TOOLKIT_SCROLL_BARS) && !defined (USE_GTK)
  /* Last value of whole for horizontal scrollbars.  */
  int whole;
#endif

  /* True if the scroll bar is horizontal.  */
  bool horizontal;
} GCALIGNED_STRUCT;

/* Turning a lisp vector value into a pointer to a struct scroll_bar.  */
#define XSCROLL_BAR(vec) ((struct scroll_bar *) XVECTOR (vec))

#ifdef USE_X_TOOLKIT

/* Extract the X widget of the scroll bar from a struct scroll_bar.
   XtWindowToWidget should be fast enough since Xt uses a hash table
   to map windows to widgets.  */

#define SCROLL_BAR_X_WIDGET(dpy, ptr) \
  XtWindowToWidget (dpy, ptr->x_window)

/* Store a widget id in a struct scroll_bar.  */

#define SET_SCROLL_BAR_X_WIDGET(ptr, w)		\
  do {						\
    Window window = XtWindow (w);		\
    ptr->x_window = window;			\
  } while (false)

#endif /* USE_X_TOOLKIT */

/* Return the inside width of a vertical scroll bar, given the outside
   width.  */
#define VERTICAL_SCROLL_BAR_INSIDE_WIDTH(f, width) \
  ((width) \
   - VERTICAL_SCROLL_BAR_LEFT_BORDER \
   - VERTICAL_SCROLL_BAR_RIGHT_BORDER)

/* Return the length of the rectangle within which the top of the
   handle must stay.  This isn't equivalent to the inside height,
   because the scroll bar handle has a minimum height.

   This is the real range of motion for the scroll bar, so when we're
   scaling buffer positions to scroll bar positions, we use this, not
   VERTICAL_SCROLL_BAR_INSIDE_HEIGHT.  */
#define VERTICAL_SCROLL_BAR_TOP_RANGE(f, height) \
  (VERTICAL_SCROLL_BAR_INSIDE_HEIGHT (f, height) - VERTICAL_SCROLL_BAR_MIN_HANDLE)

/* Return the inside height of vertical scroll bar, given the outside
   height.  See VERTICAL_SCROLL_BAR_TOP_RANGE too.  */
#define VERTICAL_SCROLL_BAR_INSIDE_HEIGHT(f, height) \
  ((height) - VERTICAL_SCROLL_BAR_TOP_BORDER - VERTICAL_SCROLL_BAR_BOTTOM_BORDER)

/* Return the inside height of a horizontal scroll bar, given the outside
   height.  */
#define HORIZONTAL_SCROLL_BAR_INSIDE_HEIGHT(f, height)	\
  ((height) \
   - HORIZONTAL_SCROLL_BAR_TOP_BORDER \
   - HORIZONTAL_SCROLL_BAR_BOTTOM_BORDER)

/* Return the length of the rectangle within which the left part of the
   handle must stay.  This isn't equivalent to the inside width, because
   the scroll bar handle has a minimum width.

   This is the real range of motion for the scroll bar, so when we're
   scaling buffer positions to scroll bar positions, we use this, not
   HORIZONTAL_SCROLL_BAR_INSIDE_WIDTH.  */
#define HORIZONTAL_SCROLL_BAR_LEFT_RANGE(f, width) \
  (HORIZONTAL_SCROLL_BAR_INSIDE_WIDTH (f, width) - HORIZONTAL_SCROLL_BAR_MIN_HANDLE)

/* Return the inside width of horizontal scroll bar, given the outside
   width.  See HORIZONTAL_SCROLL_BAR_LEFT_RANGE too.  */
#define HORIZONTAL_SCROLL_BAR_INSIDE_WIDTH(f, width) \
  ((width) - HORIZONTAL_SCROLL_BAR_LEFT_BORDER - HORIZONTAL_SCROLL_BAR_LEFT_BORDER)


/* Border widths for scroll bars.

   Scroll bar windows don't have any X borders; their border width is
   set to zero, and we redraw borders ourselves.  This makes the code
   a bit cleaner, since we don't have to convert between outside width
   (used when relating to the rest of the screen) and inside width
   (used when sizing and drawing the scroll bar window itself).

   The handle moves up and down/back and forth in a rectangle inset
   from the edges of the scroll bar.  These are widths by which we
   inset the handle boundaries from the scroll bar edges.  */
#define VERTICAL_SCROLL_BAR_LEFT_BORDER (2)
#define VERTICAL_SCROLL_BAR_RIGHT_BORDER (2)
#define VERTICAL_SCROLL_BAR_TOP_BORDER (2)
#define VERTICAL_SCROLL_BAR_BOTTOM_BORDER (2)

#define HORIZONTAL_SCROLL_BAR_LEFT_BORDER (2)
#define HORIZONTAL_SCROLL_BAR_RIGHT_BORDER (2)
#define HORIZONTAL_SCROLL_BAR_TOP_BORDER (2)
#define HORIZONTAL_SCROLL_BAR_BOTTOM_BORDER (2)

/* Minimum lengths for scroll bar handles, in pixels.  */
#define VERTICAL_SCROLL_BAR_MIN_HANDLE (5)
#define HORIZONTAL_SCROLL_BAR_MIN_HANDLE (5)

/* If a struct input_event has a kind which is SELECTION_REQUEST_EVENT
   or SELECTION_CLEAR_EVENT, then its contents are really described
   by this structure.  */

/* For an event of kind SELECTION_REQUEST_EVENT,
   this structure really describes the contents.  */

struct selection_input_event
{
  ENUM_BF (event_kind) kind : EVENT_KIND_WIDTH;
  struct x_display_info *dpyinfo;
  /* We spell it with an "o" here because X does.  */
  Window requestor;
  Atom selection, target, property;
  Time time;
};

/* Unlike macros below, this can't be used as an lvalue.  */
INLINE Display *
SELECTION_EVENT_DISPLAY (struct selection_input_event *ev)
{
  return ev->dpyinfo->display;
}
#define SELECTION_EVENT_DPYINFO(eventp) \
  ((eventp)->dpyinfo)
/* We spell it with an "o" here because X does.  */
#define SELECTION_EVENT_REQUESTOR(eventp)	\
  ((eventp)->requestor)
#define SELECTION_EVENT_SELECTION(eventp)	\
  ((eventp)->selection)
#define SELECTION_EVENT_TARGET(eventp)	\
  ((eventp)->target)
#define SELECTION_EVENT_PROPERTY(eventp)	\
  ((eventp)->property)
#define SELECTION_EVENT_TIME(eventp)	\
  ((eventp)->time)

/* From xfns.c.  */

extern void x_free_gcs (struct frame *);
extern void x_relative_mouse_position (struct frame *, int *, int *);
extern void x_real_pos_and_offsets (struct frame *, int *, int *, int *,
                                    int *, int *, int *, int *, int *,
				    int *);
extern void x_default_font_parameter (struct frame *, Lisp_Object);

/* From xrdb.c.  */

extern XrmDatabase x_load_resources (Display *, const char *, const char *,
				     const char *);
extern const char *x_get_string_resource (void *, const char *, const char *);

/* Defined in xterm.c */

typedef void (*x_special_error_handler) (Display *, XErrorEvent *, char *,
					 void *);

extern bool x_text_icon (struct frame *, const char *);
extern void x_catch_errors (Display *);
extern void x_catch_errors_with_handler (Display *, x_special_error_handler,
					 void *);
extern void x_catch_errors_for_lisp (struct x_display_info *);
extern void x_uncatch_errors_for_lisp (struct x_display_info *);
extern void x_check_errors_for_lisp (struct x_display_info *,
				     const char *)
  ATTRIBUTE_FORMAT_PRINTF (2, 0);
extern void x_check_errors (Display *, const char *)
  ATTRIBUTE_FORMAT_PRINTF (2, 0);
extern bool x_had_errors_p (Display *);
extern void x_unwind_errors_to (int);
extern void x_uncatch_errors (void);
extern void x_uncatch_errors_after_check (void);
extern void x_ignore_errors_for_next_request (struct x_display_info *);
extern void x_stop_ignoring_errors (struct x_display_info *);
extern void x_clear_errors (Display *);
extern void x_set_window_size (struct frame *, bool, int, int);
extern void x_set_last_user_time_from_lisp (struct x_display_info *, Time);
extern void x_make_frame_visible (struct frame *);
extern void x_make_frame_invisible (struct frame *);
extern void x_iconify_frame (struct frame *);
extern void x_free_frame_resources (struct frame *);
extern void x_wm_set_size_hint (struct frame *, long, bool, int, int);
#if defined HAVE_XSYNCTRIGGERFENCE && !defined USE_GTK \
  && defined HAVE_CLOCK_GETTIME
extern void x_sync_init_fences (struct frame *);
#endif
extern bool x_embed_frame (struct x_display_info *, struct frame *);

extern void x_delete_terminal (struct terminal *);
extern Cursor x_create_font_cursor (struct x_display_info *, int);
extern unsigned long x_copy_color (struct frame *, unsigned long);
#ifdef USE_X_TOOLKIT
extern XtAppContext Xt_app_con;
extern void x_activate_timeout_atimer (void);
#endif
#ifdef USE_LUCID
extern bool x_alloc_lighter_color_for_widget (Widget, Display *, Colormap,
					      unsigned long *,
					      double, int);
#endif
extern bool x_alloc_nearest_color (struct frame *, Colormap, XColor *);
extern void x_query_colors (struct frame *f, XColor *, int);
extern void x_clear_area (struct frame *f, int, int, int, int);
#if (defined USE_LUCID && defined HAVE_XINPUT2) \
  || (!defined USE_X_TOOLKIT && !defined USE_GTK)
extern void x_mouse_leave (struct x_display_info *);
#endif
extern void x_wait_for_cell_change (Lisp_Object, struct timespec);

#ifndef USE_GTK
extern int x_dispatch_event (XEvent *, Display *);
#endif
extern int x_x_to_emacs_modifiers (struct x_display_info *, int);
extern int x_emacs_to_x_modifiers (struct x_display_info *, intmax_t);
#ifdef USE_CAIRO
extern void x_cr_destroy_frame_context (struct frame *);
extern void x_cr_update_surface_desired_size (struct frame *, int, int);
extern cairo_t *x_begin_cr_clip (struct frame *, GC);
extern void x_end_cr_clip (struct frame *);
extern void x_set_cr_source_with_gc_foreground (struct frame *, GC, bool);
extern void x_set_cr_source_with_gc_background (struct frame *, GC, bool);
extern void x_cr_draw_frame (cairo_t *, struct frame *);
extern Lisp_Object x_cr_export_frames (Lisp_Object, cairo_surface_type_t);
#endif

#ifdef HAVE_XFIXES
extern Window x_find_selection_owner (struct x_display_info *, Atom);
#endif

#ifdef HAVE_XRENDER
extern void x_xrender_color_from_gc_background (struct frame *, GC,
						XRenderColor *, bool);
extern void x_xr_ensure_picture (struct frame *);
extern void x_xr_apply_ext_clip (struct frame *, GC);
extern void x_xr_reset_ext_clip (struct frame *);
#endif

extern void x_translate_coordinates (struct frame *, int, int, int *, int *);
extern void x_translate_coordinates_to_root (struct frame *, int, int,
					     int *, int *);
extern Lisp_Object x_handle_translate_coordinates (struct frame *, Lisp_Object,
						   int, int);

extern Bool x_query_pointer (Display *, Window, Window *, Window *, int *,
			     int *, int *, int *, unsigned int *);

#ifdef HAVE_GTK3
extern void x_scroll_bar_configure (GdkEvent *);
#endif

#define DEFER_SELECTIONS						\
  x_defer_selection_requests ();					\
  record_unwind_protect_void (x_release_selection_requests_and_flush)

extern void x_defer_selection_requests (void);
extern void x_release_selection_requests_and_flush (void);
extern void x_handle_pending_selection_requests (void);
extern bool x_detect_pending_selection_requests (void);
extern Lisp_Object x_dnd_begin_drag_and_drop (struct frame *, Time, Atom,
					      Lisp_Object, Atom *, const char **,
					      size_t, bool, Atom *, int,
					      Lisp_Object, bool);
extern void x_dnd_do_unsupported_drop (struct x_display_info *, Lisp_Object,
				       Lisp_Object, Lisp_Object, Window, int,
				       int, Time);

extern int x_display_pixel_height (struct x_display_info *);
extern int x_display_pixel_width (struct x_display_info *);

INLINE unsigned long
x_make_truecolor_pixel (struct x_display_info *dpyinfo, int r, int g, int b)
{
  unsigned long pr, pg, pb, pa = dpyinfo->alpha_mask;

  /* Scale down RGB values to the visual's bits per RGB, and shift
     them to the right position in the pixel color.  Note that the
     original RGB values are 16-bit values, as usual in X.  */
  pr = (r >> (16 - dpyinfo->red_bits))   << dpyinfo->red_offset;
  pg = (g >> (16 - dpyinfo->green_bits)) << dpyinfo->green_offset;
  pb = (b >> (16 - dpyinfo->blue_bits))  << dpyinfo->blue_offset;

  /* Assemble the pixel color.  */
  return pr | pg | pb | pa;
}

/* If display has an immutable color map, freeing colors is not
   necessary and some servers don't allow it, so we won't do it.  That
   also allows us to make other optimizations relating to server-side
   reference counts.  */
INLINE bool
x_mutable_colormap (XVisualInfo *visual)
{
  int class = visual->class;
  return (class != StaticColor && class != StaticGray && class != TrueColor);
}

extern void x_set_sticky (struct frame *, Lisp_Object, Lisp_Object);
extern void x_set_shaded (struct frame *, Lisp_Object, Lisp_Object);
extern void x_set_skip_taskbar (struct frame *, Lisp_Object, Lisp_Object);
extern void x_set_z_group (struct frame *, Lisp_Object, Lisp_Object);
extern bool x_wm_supports (struct frame *, Atom);
extern bool x_wm_supports_1 (struct x_display_info *, Atom);
extern void x_wait_for_event (struct frame *, int);
extern void x_clear_under_internal_border (struct frame *f);

extern void tear_down_x_back_buffer (struct frame *f);
extern void initial_set_up_x_back_buffer (struct frame *f);

/* Defined in xfns.c.  */
extern void x_real_positions (struct frame *, int *, int *);
extern void x_change_tab_bar_height (struct frame *, int);
extern void x_change_tool_bar_height (struct frame *, int);
extern void x_implicitly_set_name (struct frame *, Lisp_Object, Lisp_Object);
extern void x_set_scroll_bar_default_width (struct frame *);
extern void x_set_scroll_bar_default_height (struct frame *);
#ifdef USE_LUCID
extern void xlw_monitor_dimensions_at_pos (Display *, Screen *, int, int,
					   int *, int *, int *, int *);
#endif

/* Defined in xselect.c.  */

extern void x_handle_property_notify (const XPropertyEvent *);
extern void x_handle_selection_notify (const XSelectionEvent *);
extern void x_handle_selection_event (struct selection_input_event *);
extern void x_clear_frame_selections (struct frame *);
extern Lisp_Object x_atom_to_symbol (struct x_display_info *, Atom);
extern Atom symbol_to_x_atom (struct x_display_info *, Lisp_Object);

extern bool x_handle_dnd_message (struct frame *,
				  const XClientMessageEvent *,
				  struct x_display_info *,
				  struct input_event *,
				  bool, int, int);
extern int x_check_property_data (Lisp_Object);
extern void x_fill_property_data (Display *,
                                  Lisp_Object,
                                  void *,
				  int,
                                  int);
extern Lisp_Object x_property_data_to_lisp (struct frame *,
                                            const unsigned char *,
                                            Atom,
                                            int,
                                            unsigned long);
extern void x_clipboard_manager_save_frame (Lisp_Object);
extern void x_clipboard_manager_save_all (void);

extern Lisp_Object x_timestamp_for_selection (struct x_display_info *,
					      Lisp_Object);
extern void x_own_selection (Lisp_Object, Lisp_Object, Lisp_Object,
			     Lisp_Object, Time);
extern Atom x_intern_cached_atom (struct x_display_info *, const char *,
				  bool);
extern char *x_get_atom_name (struct x_display_info *, Atom, bool *)
  ATTRIBUTE_MALLOC ATTRIBUTE_DEALLOC_FREE;

#ifdef USE_GTK
extern bool xg_set_icon (struct frame *, Lisp_Object);
extern bool xg_set_icon_from_xpm_data (struct frame *, const char **);
#endif /* USE_GTK */

extern void xic_free_xfontset (struct frame *);
extern void create_frame_xic (struct frame *);
extern void destroy_frame_xic (struct frame *);
extern void xic_set_preeditarea (struct window *, int, int);
extern void xic_set_statusarea (struct frame *);
extern void xic_set_xfontset (struct frame *, const char *);
extern bool x_defined_color (struct frame *, const char *, Emacs_Color *,
                             bool, bool);
extern void x_preserve_selections (struct x_display_info *, Lisp_Object,
				   Lisp_Object);
extern Lisp_Object x_get_keyboard_modifiers (struct x_display_info *);
#ifdef HAVE_X_I18N
extern void free_frame_xic (struct frame *);
# if defined HAVE_X_WINDOWS && defined USE_X_TOOLKIT
extern char *xic_create_fontsetname (const char *, bool);
# endif
#endif

/* Defined in xfaces.c */

#ifdef USE_X_TOOLKIT
extern void x_free_dpy_colors (Display *, Screen *, Colormap,
                               unsigned long *, int);
#endif /* USE_X_TOOLKIT */

/* Defined in xmenu.c */

#if defined USE_X_TOOLKIT || defined USE_GTK
extern Lisp_Object xw_popup_dialog (struct frame *, Lisp_Object, Lisp_Object);
#endif

#if defined USE_GTK || defined USE_MOTIF
extern void x_menu_set_in_use (bool);
#endif
extern void x_menu_wait_for_event (void *data);
extern void initialize_frame_menubar (struct frame *);

/* Defined in xsmfns.c */
#ifdef HAVE_X_SM
extern void x_session_initialize (struct x_display_info *dpyinfo);
extern bool x_session_have_connection (void);
extern void x_session_close (void);
#endif

#ifdef HAVE_X_I18N
#define STYLE_OFFTHESPOT (XIMPreeditArea | XIMStatusArea)
#define STYLE_OVERTHESPOT (XIMPreeditPosition | XIMStatusNothing)
#define STYLE_ROOT (XIMPreeditNothing | XIMStatusNothing)
#define STYLE_CALLBACK (XIMPreeditCallbacks | XIMStatusNothing)
#define STYLE_NONE (XIMPreeditNothing | XIMStatusNothing)
#endif

#ifdef USE_GTK
extern struct input_event xg_pending_quit_event;
#endif

extern bool x_dnd_in_progress;
extern bool x_dnd_waiting_for_finish;
extern struct frame *x_dnd_frame;
extern struct frame *x_dnd_finish_frame;
extern int x_error_message_count;

#ifdef HAVE_XINPUT2
extern struct xi_device_t *xi_device_from_id (struct x_display_info *, int);
extern bool xi_frame_selected_for (struct frame *, unsigned long);
#ifndef USE_GTK
extern unsigned int xi_convert_event_state (XIDeviceEvent *);
#endif
#endif

extern void mark_xterm (void);

/* Is the frame embedded into another application? */

#define FRAME_X_EMBEDDED_P(f) (FRAME_X_OUTPUT (f)->explicit_parent != 0)

#define STORE_NATIVE_RECT(nr,rx,ry,rwidth,rheight)	\
  ((nr).x = (rx),					\
   (nr).y = (ry),					\
   (nr).width = (rwidth),				\
   (nr).height = (rheight))

INLINE_HEADER_END

#endif /* XTERM_H */