GDK Reference Manual
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# X Window System Interaction

## Name

X Window System Interaction --

## Synopsis

    #include <gdk/gdk.h>

    #define     GDK_ROOT_WINDOW                 ()
    #define     GDK_ROOT_PARENT                 ()
    #define     GDK_DISPLAY                     ()
    #define     GDK_WINDOW_XDISPLAY             (win)
    #define     GDK_WINDOW_XID                  (win)
    #define     GDK_PIXMAP_XDISPLAY             (pix)
    #define     GDK_PIXMAP_XID                  (pix)
    #define     GDK_DISPLAY_XDISPLAY            (display)
    #define     GDK_DRAWABLE_XDISPLAY           (win)
    #define     GDK_DRAWABLE_XID                (win)
    #define     GDK_IMAGE_XDISPLAY              (image)
    #define     GDK_IMAGE_XIMAGE                (image)
    #define     GDK_GC_XDISPLAY                 (gc)
    #define     GDK_COLORMAP_XDISPLAY           (cmap)
    #define     GDK_COLORMAP_XCOLORMAP          (cmap)
    #define     GDK_SCREEN_XDISPLAY             (screen)
    #define     GDK_SCREEN_XNUMBER              (screen)
    #define     GDK_SCREEN_XSCREEN              (screen)
    #define     GDK_VISUAL_XVISUAL              (vis)
    #define     GDK_FONT_XDISPLAY               (font)
    #define     GDK_FONT_XFONT                  (font)
    #define     GDK_CURSOR_XCURSOR              (cursor)
    #define     GDK_CURSOR_XDISPLAY             (cursor)
    #define     GDK_GC_XGC                      (gc)
    #define     GDK_GC_GET_XGC                  (gc)
    #define     GDK_WINDOW_XWINDOW
    GdkVisual*  gdkx_visual_get                 (VisualID xvisualid);
    GdkVisual*  gdkx_visual_get_for_screen      (GdkScreen *screen,
                                                 VisualID xvisualid);
    GdkColormap* gdkx_colormap_get              (Colormap xcolormap);
    GdkPixmap*  gdk_pixmap_foreign_new          (GdkNativeWindow anid);
    GdkPixmap*  gdk_pixmap_foreign_new_for_display
                                                (GdkDisplay *display,
                                                 GdkNativeWindow anid);
    GdkWindow*  gdk_window_foreign_new          (GdkNativeWindow anid);
    GdkWindow*  gdk_window_foreign_new_for_display
                                                (GdkDisplay *display,
                                                 GdkNativeWindow anid);
    gpointer    gdk_xid_table_lookup            (XID xid);
    gpointer    gdk_xid_table_lookup_for_display
                                                (GdkDisplay *display,
                                                 XID xid);
    GdkWindow*  gdk_window_lookup               (GdkNativeWindow anid);
    GdkWindow*  gdk_window_lookup_for_display   (GdkDisplay *display,
                                                 GdkNativeWindow anid);
    GdkPixmap*  gdk_pixmap_lookup               (GdkNativeWindow anid);
    GdkPixmap*  gdk_pixmap_lookup_for_display   (GdkDisplay *display,
                                                 GdkNativeWindow anid);
    #define     gdk_font_lookup                 (xid)
    #define     gdk_font_lookup_for_display     (display, xid)
    GdkDisplay* gdk_x11_lookup_xdisplay         (Display *xdisplay);
    guint32     gdk_x11_get_server_time         (GdkWindow *window);
    gboolean    gdk_net_wm_supports             (GdkAtom property);
    gboolean    gdk_x11_screen_supports_net_wm_hint
                                                (GdkScreen *screen,
                                                 GdkAtom property);
    Colormap    gdk_x11_colormap_get_xcolormap  (GdkColormap *colormap);
    Display*    gdk_x11_colormap_get_xdisplay   (GdkColormap *colormap);
    Cursor      gdk_x11_cursor_get_xcursor      (GdkCursor *cursor);
    Display*    gdk_x11_cursor_get_xdisplay     (GdkCursor *cursor);
    Display*    gdk_x11_display_get_xdisplay    (GdkDisplay *display);
    Display*    gdk_x11_drawable_get_xdisplay   (GdkDrawable *drawable);
    XID         gdk_x11_drawable_get_xid        (GdkDrawable *drawable);
    G_CONST_RETURN char* gdk_x11_font_get_name  (GdkFont *font);
    Display*    gdk_x11_font_get_xdisplay       (GdkFont *font);
    gpointer    gdk_x11_font_get_xfont          (GdkFont *font);
    Display*    gdk_x11_gc_get_xdisplay         (GdkGC *gc);
    GC          gdk_x11_gc_get_xgc              (GdkGC *gc);
    Window      gdk_x11_get_default_root_xwindow
                                                (void);
    gint        gdk_x11_get_default_screen      (void);
    Display*    gdk_x11_get_default_xdisplay    (void);
    void        gdk_x11_grab_server             ();
    Display*    gdk_x11_image_get_xdisplay      (GdkImage *image);
    XImage*     gdk_x11_image_get_ximage        (GdkImage *image);
    int         gdk_x11_screen_get_screen_number
                                                (GdkScreen *screen);
    Screen*     gdk_x11_screen_get_xscreen      (GdkScreen *screen);
    void        gdk_x11_ungrab_server           ();
    Visual*     gdk_x11_visual_get_xvisual      (GdkVisual *visual);
    Atom        gdk_x11_atom_to_xatom           (GdkAtom atom);
    Atom        gdk_x11_atom_to_xatom_for_display
                                                (GdkDisplay *display,
                                                 GdkAtom atom);
    GdkAtom     gdk_x11_xatom_to_atom           (Atom xatom);
    GdkAtom     gdk_x11_xatom_to_atom_for_display
                                                (GdkDisplay *display,
                                                 Atom xatom);
    Atom        gdk_x11_get_xatom_by_name       (const gchar *atom_name);
    Atom        gdk_x11_get_xatom_by_name_for_display
                                                (GdkDisplay *display,
                                                 const gchar *atom_name);
    G_CONST_RETURN gchar* gdk_x11_get_xatom_name
                                                (Atom xatom);
    G_CONST_RETURN gchar* gdk_x11_get_xatom_name_for_display
                                                (GdkDisplay *display,
                                                 Atom xatom);

## Description

## Details

### GDK_ROOT_WINDOW()

    #define GDK_ROOT_WINDOW()             (gdk_x11_get_default_root_xwindow ())

Obtains the Xlib window id of the root window of the current screen.

### GDK_ROOT_PARENT()

    #define GDK_ROOT_PARENT()             (gdk_get_default_root_window ())

Warning
`GDK_ROOT_PARENT` is deprecated and should not be used in newly-written code.

Obtains the Xlib window id of the root window of the default screen.

### GDK_DISPLAY()

    #define GDK_DISPLAY()                 gdk_display

The current display.

Returns : | an Xlib Display*.

### GDK_WINDOW_XDISPLAY()

    #define     GDK_WINDOW_XDISPLAY(win)

Returns the display of a GdkWindow.

`win` : | a GdkWindow.
Returns : | an Xlib Display*.

### GDK_WINDOW_XID()

    #define     GDK_WINDOW_XID(win)

Returns the X window belonging to a GdkWindow.

`win` : | a GdkWindow.
Returns : | the Xlib Window of `win`.

### GDK_PIXMAP_XDISPLAY()

    #define     GDK_PIXMAP_XDISPLAY(pix)

Returns the display of a GdkPixmap.

`pix` : |
Returns : | an Xlib Display*.

### GDK_PIXMAP_XID()

    #define     GDK_PIXMAP_XID(pix)

Returns the X pixmap belonging to a GdkPixmap.

`pix` : |
Returns : | the Xlib XPixmap of `win`.

### GDK_DISPLAY_XDISPLAY()

    #define     GDK_DISPLAY_XDISPLAY(display)

Returns the display of a GdkDisplay.

`display` : | a GdkDisplay.

### GDK_DRAWABLE_XDISPLAY()

    #define     GDK_DRAWABLE_XDISPLAY(win)

Returns the display of a GdkDrawable.

`win` : | a GdkDrawable.
Returns : | an Xlib Display*.

### GDK_DRAWABLE_XID()

    #define     GDK_DRAWABLE_XID(win)

Returns the X resource (window or pixmap) belonging to a GdkDrawable.

`win` : | a GdkDrawable.
Returns : | the ID of `win`'s X resource.

### GDK_IMAGE_XDISPLAY()

    #define GDK_IMAGE_XDISPLAY(image)     (gdk_x11_image_get_xdisplay (image))

Returns the display of a GdkImage.

`image` : | a GdkImage.
Returns : | an Xlib Display*.

### GDK_IMAGE_XIMAGE()

    #define GDK_IMAGE_XIMAGE(image)       (gdk_x11_image_get_ximage (image))

Returns the X image belonging to a GdkImage.

`image` : | a GdkImage.
Returns : | an XImage*.

### GDK_GC_XDISPLAY()

    #define     GDK_GC_XDISPLAY(gc)

Returns the display of a GdkGC.

`gc` : | a GdkGC.
Returns : | an Xlib Display*.

### GDK_COLORMAP_XDISPLAY()

    #define GDK_COLORMAP_XDISPLAY(cmap)   (gdk_x11_colormap_get_xdisplay (cmap))

Returns the display of a GdkColormap.

`cmap` : | a GdkColormap.
Returns : | an Xlib Display*.

### GDK_COLORMAP_XCOLORMAP()

    #define GDK_COLORMAP_XCOLORMAP(cmap)  (gdk_x11_colormap_get_xcolormap (cmap))

Returns the X colormap belonging to a GdkColormap.

`cmap` : | a GdkColormap.
Returns : | an Xlib Colormap.

### GDK_SCREEN_XDISPLAY()

    #define     GDK_SCREEN_XDISPLAY(screen)

Returns the display of a GdkScreen.

`screen` : | a GdkScreen.
Returns : | an Xlib Display*.

### GDK_SCREEN_XNUMBER()

    #define     GDK_SCREEN_XNUMBER(screen)

Returns the index of a GdkScreen.

`screen` : | a GdkScreen
Returns : | the position of `screen` among the screens of its display.

### GDK_SCREEN_XSCREEN()

    #define     GDK_SCREEN_XSCREEN(screen)

Returns the screen of a GdkScreen.

`screen` : | a GdkScreen
Returns : | an Xlib Screen*.

### GDK_VISUAL_XVISUAL()

    #define     GDK_VISUAL_XVISUAL(vis)

Returns the X visual belonging to a GdkVisual.

`vis` : | a GdkVisual.
Returns : | an Xlib Visual*.

### GDK_FONT_XDISPLAY()

    #define GDK_FONT_XDISPLAY(font)       (gdk_x11_font_get_xdisplay (font))

Warning
`GDK_FONT_XDISPLAY` is deprecated and should not be used in newly-written code.

Returns the display of a GdkFont.

`font` : | a GdkFont.
Returns : | an Xlib Display*.

### GDK_FONT_XFONT()

    #define GDK_FONT_XFONT(font)          (gdk_x11_font_get_xfont (font))

Warning
`GDK_FONT_XFONT` is deprecated and should not be used in newly-written code.

Returns the X font belonging to a GdkFont.

`font` : | a GdkFont.
Returns : | an Xlib XFontStruct* or an XFontSet.

### GDK_CURSOR_XCURSOR()

    #define GDK_CURSOR_XCURSOR(cursor)    (gdk_x11_cursor_get_xcursor (cursor))

Returns the X cursor belonging to a GdkCursor.

`cursor` : | a GdkCursor.
Returns : | an Xlib Cursor.

### GDK_CURSOR_XDISPLAY()

    #define GDK_CURSOR_XDISPLAY(cursor)   (gdk_x11_cursor_get_xdisplay (cursor))

Returns the display of a GdkCursor.

`cursor` : | a GdkCursor.
Returns : | an Xlib Display*.

### GDK_GC_XGC()

    #define     GDK_GC_XGC(gc)

Returns the X GC of a GdkGC.

> Note: Note that the clip origin, clip region and tile/stipple origin fields of the returned GC may not be in sync with `gc`. If you need that, use GDK_GC_GET_XGC().

`gc` : | a GdkGC.
Returns : | an Xlib GC.

### GDK_GC_GET_XGC()

    #define GDK_GC_GET_XGC(gc)	      (GDK_GC_X11(gc)->dirty_mask ? _gdk_x11_gc_flush (gc) : ((GdkGCX11 *)(gc))->xgc)

Returns the X GC of a GdkGC.

`gc` : | a GdkGC.
Returns : | an Xlib GC.

### GDK_WINDOW_XWINDOW

    #define     GDK_WINDOW_XWINDOW

Another name for GDK_DRAWABLE_XID().

### gdkx_visual_get ()

    GdkVisual*  gdkx_visual_get                 (VisualID xvisualid);

Returns a GdkVisual corresponding to a X visual.

`xvisualid` : | a X visual id.
Returns : | the GdkVisual.

### gdkx_visual_get_for_screen ()

    GdkVisual*  gdkx_visual_get_for_screen      (GdkScreen *screen,
                                                 VisualID xvisualid);

Returns a GdkVisual from and X Visual id.

`screen` : | a GdkScreen.
`xvisualid` : | an X Visual ID.
Returns : | a GdkVisual.

### gdkx_colormap_get ()

    GdkColormap* gdkx_colormap_get              (Colormap xcolormap);

Returns a GdkColormap corresponding to a X colormap.

`xcolormap` : | a X colormap.
Returns : | the GdkColormap.

### gdk_pixmap_foreign_new ()

    GdkPixmap*  gdk_pixmap_foreign_new          (GdkNativeWindow anid);

Wraps a native window for the default display in a GdkPixmap. This may fail if the pixmap has been destroyed.

For example in the X backend, a native pixmap handle is an Xlib XID.

`anid` : | a native pixmap handle.
Returns : | the newly-created GdkPixmap wrapper for the native pixmap or `NULL` if the pixmap has been destroyed.

### gdk_pixmap_foreign_new_for_display ()

    GdkPixmap*  gdk_pixmap_foreign_new_for_display
                                                (GdkDisplay *display,
                                                 GdkNativeWindow anid);

Wraps a native window in a GdkPixmap. This may fail if the pixmap has been destroyed.

For example in the X backend, a native pixmap handle is an Xlib XID.

`display` : | The GdkDisplay where `anid` is located.
`anid` : | a native pixmap handle.
Returns : | the newly-created GdkPixmap wrapper for the native pixmap or `NULL` if the pixmap has been destroyed.

### gdk_window_foreign_new ()

    GdkWindow*  gdk_window_foreign_new          (GdkNativeWindow anid);

Wraps a native window for the default display in a GdkWindow. This may fail if the window has been destroyed.

For example in the X backend, a native window handle is an Xlib XID.

`anid` : | a native window handle.
Returns : | the newly-created GdkWindow wrapper for the native window or `NULL` if the window has been destroyed.

### gdk_window_foreign_new_for_display ()

    GdkWindow*  gdk_window_foreign_new_for_display
                                                (GdkDisplay *display,
                                                 GdkNativeWindow anid);

Wraps a native window in a GdkWindow. This may fail if the window has been destroyed.

For example in the X backend, a native window handle is an Xlib XID.

`display` : | the GdkDisplay where the window handle comes from.
`anid` : | a native window handle.
Returns : | the newly-created GdkWindow wrapper for the native window or `NULL` if the window has been destroyed.

### gdk_xid_table_lookup ()

    gpointer    gdk_xid_table_lookup            (XID xid);

Returns the Gdk object associated with the given X id.

`xid` : | an X id.
Returns : | the associated Gdk object, which may be a GdkPixmap, a GdkWindow or a GdkFont.

### gdk_xid_table_lookup_for_display ()

    gpointer    gdk_xid_table_lookup_for_display
                                                (GdkDisplay *display,
                                                 XID xid);

Returns the Gdk object associated with the given X id.

`display` : | the GdkDisplay.
`xid` : | an X id.
Returns : | an GdkObject associated with the given X id.

### gdk_window_lookup ()

    GdkWindow*  gdk_window_lookup               (GdkNativeWindow anid);

Looks up the GdkWindow that wraps the given native window handle.

For example in the X backend, a native window handle is an Xlib XID.

`anid` : | a native window handle.
Returns : | the GdkWindow wrapper for the native window, or `NULL` if there is none.

### gdk_window_lookup_for_display ()

    GdkWindow*  gdk_window_lookup_for_display   (GdkDisplay *display,
                                                 GdkNativeWindow anid);

Looks up the GdkWindow that wraps the given native window handle.

For example in the X backend, a native window handle is an Xlib XID.

`display` : | the GdkDisplay corresponding to the window handle
`anid` : | a native window handle.
Returns : | the GdkWindow wrapper for the native window, or `NULL` if there is none.

### gdk_pixmap_lookup ()

    GdkPixmap*  gdk_pixmap_lookup               (GdkNativeWindow anid);

Looks up the GdkPixmap that wraps the given native pixmap handle.

For example in the X backend, a native pixmap handle is an Xlib XID.

`anid` : | a native pixmap handle.
Returns : | the GdkWindow wrapper for the native window, or `NULL` if there is none.

### gdk_pixmap_lookup_for_display ()

    GdkPixmap*  gdk_pixmap_lookup_for_display   (GdkDisplay *display,
                                                 GdkNativeWindow anid);

Looks up the GdkPixmap that wraps the given native pixmap handle.

For example in the X backend, a native pixmap handle is an Xlib XID.

`display` : | the GdkDisplay associated with `anid`
`anid` : | a native pixmap handle.
Returns : | the GdkWindow wrapper for the native window, or `NULL` if there is none.

### gdk_font_lookup()

    #define gdk_font_lookup(xid)	   ((GdkFont*) gdk_xid_table_lookup (xid))

Warning
`gdk_font_lookup` is deprecated and should not be used in newly-written code.

Obtains the GdkFont for the given Xlib font ID, or `NULL` if no GdkFont has been created for `xid`.

`xid` : |

### gdk_font_lookup_for_display()

    #define gdk_font_lookup_for_display(display, xid) ((GdkFont*) gdk_xid_table_lookup_for_display (display, xid))

Warning
`gdk_font_lookup_for_display` is deprecated and should not be used in newly-written code.

Obtains the GdkFont for the given Xlib font ID on `display`, or `NULL` if no GdkFont has been created for `xid`.

`display` : |
`xid` : |

### gdk_x11_lookup_xdisplay ()

    GdkDisplay* gdk_x11_lookup_xdisplay         (Display *xdisplay);

Find the GdkDisplay corresponding to `display`, if any exists.

`xdisplay` : | a pointer to an X Display
Returns : | the GdkDisplay, if found, otherwise `NULL`.

### gdk_x11_get_server_time ()

    guint32     gdk_x11_get_server_time         (GdkWindow *window);

Routine to get the current X server time stamp.

`window` : | a GdkWindow, used for communication with the server. The window must have GDK_PROPERTY_CHANGE_MASK in its events mask or a hang will result.
Returns : | the time stamp.

### gdk_net_wm_supports ()

    gboolean    gdk_net_wm_supports             (GdkAtom property);

This function is specific to the X11 backend of GDK, and indicates whether the window manager for the default screen supports a certain hint from the Extended Window Manager Hints Specification. See gdk_x11_screen_supports_net_wm_hint() for complete details.

`property` : | a property atom.
Returns : | `TRUE` if the window manager supports `property`

### gdk_x11_screen_supports_net_wm_hint ()

    gboolean    gdk_x11_screen_supports_net_wm_hint
                                                (GdkScreen *screen,
                                                 GdkAtom property);

This function is specific to the X11 backend of GDK, and indicates whether the window manager supports a certain hint from the Extended Window Manager Hints Specification. You can find this specification on http://www.freedesktop.org.

When using this function, keep in mind that the window manager can change over time; so you shouldn't use this function in a way that impacts persistent application state. A common bug is that your application can start up before the window manager does when the user logs in, and before the window manager starts gdk_x11_screen_supports_net_wm_hint() will return `FALSE` for every property.

`screen` : | the relevant GdkScreen.
`property` : | a property atom.
Returns : | `TRUE` if the window manager supports `property`

### gdk_x11_colormap_get_xcolormap ()

    Colormap    gdk_x11_colormap_get_xcolormap  (GdkColormap *colormap);

Returns the X colormap belonging to a GdkColormap.

`colormap` : | a GdkColormap.
Returns : | an Xlib Colormap.

### gdk_x11_colormap_get_xdisplay ()

    Display*    gdk_x11_colormap_get_xdisplay   (GdkColormap *colormap);

Returns the display of a GdkColormap.

`colormap` : | a GdkColormap.
Returns : | an Xlib Display*.

### gdk_x11_cursor_get_xcursor ()

    Cursor      gdk_x11_cursor_get_xcursor      (GdkCursor *cursor);

Returns the X cursor belonging to a GdkCursor.

`cursor` : | a GdkCursor.
Returns : |

### gdk_x11_cursor_get_xdisplay ()

    Display*    gdk_x11_cursor_get_xdisplay     (GdkCursor *cursor);

Returns the display of a GdkCursor.

`cursor` : | a GdkCursor.
Returns : | an Xlib Display*.

### gdk_x11_display_get_xdisplay ()

    Display*    gdk_x11_display_get_xdisplay    (GdkDisplay *display);

Returns the X display of a GdkDisplay.

`display` : | a GdkDisplay
Returns : | an X display.

### gdk_x11_drawable_get_xdisplay ()

    Display*    gdk_x11_drawable_get_xdisplay   (GdkDrawable *drawable);

Returns the display of a GdkDrawable.

`drawable` : | a GdkDrawable.
Returns : | an Xlib Display*.

### gdk_x11_drawable_get_xid ()

    XID         gdk_x11_drawable_get_xid        (GdkDrawable *drawable);

Returns the X resource (window or pixmap) belonging to a GdkDrawable.

`drawable` : | a GdkDrawable.
Returns : | the ID of `win`'s X resource.

### gdk_x11_font_get_name ()

    G_CONST_RETURN char* gdk_x11_font_get_name  (GdkFont *font);

Warning
`gdk_x11_font_get_name` is deprecated and should not be used in newly-written code.

Return the X Logical Font Description (for font->type == GDK_FONT_FONT) or comma separated list of XLFDs (for font->type == GDK_FONT_FONTSET) that was used to load the font. If the same font was loaded via multiple names, which name is returned is undefined.

`font` : | a GdkFont.
Returns : | the name of the font. This string is owned by GDK and must not be modified or freed.

### gdk_x11_font_get_xdisplay ()

    Display*    gdk_x11_font_get_xdisplay       (GdkFont *font);

Warning
`gdk_x11_font_get_xdisplay` is deprecated and should not be used in newly-written code.

Returns the display of a GdkFont.

`font` : | a GdkFont.
Returns : | an Xlib Display*.

### gdk_x11_font_get_xfont ()

    gpointer    gdk_x11_font_get_xfont          (GdkFont *font);

Warning
`gdk_x11_font_get_xfont` is deprecated and should not be used in newly-written code.

Returns the X font belonging to a GdkFont.

`font` : | a GdkFont.
Returns : | an Xlib XFontStruct* or an XFontSet.

### gdk_x11_gc_get_xdisplay ()

    Display*    gdk_x11_gc_get_xdisplay         (GdkGC *gc);

Returns the display of a GdkGC.

`gc` : | a GdkGC.
Returns : | an Xlib Display*.

### gdk_x11_gc_get_xgc ()

    GC          gdk_x11_gc_get_xgc              (GdkGC *gc);

Returns the X GC of a GdkGC.

`gc` : | a GdkGC.
Returns : | an Xlib GC.

### gdk_x11_get_default_root_xwindow ()

    Window      gdk_x11_get_default_root_xwindow
                                                (void);

Gets the root window of the default screen (see gdk_x11_get_default_screen()).

Returns : | an Xlib Window.

### gdk_x11_get_default_screen ()

    gint        gdk_x11_get_default_screen      (void);

Gets the default GTK+ screen number.

Returns : | returns the screen number specified by the --display command line option on the DISPLAY environment variable gdk_init() calls XOpenDisplay().

### gdk_x11_get_default_xdisplay ()

    Display*    gdk_x11_get_default_xdisplay    (void);

Gets the default GTK+ display.

Returns : | the Xlib Display* for the display specified in the `--display` command line option or the `DISPLAY` environment variable.

### gdk_x11_grab_server ()

    void        gdk_x11_grab_server             ();

Call `XGrabServer()` on the default display. To ungrab the server again, use gdk_x11_ungrab_server().

gdk_x11_grab_server()/gdk_x11_ungrab_server() calls can be nested.

### gdk_x11_image_get_xdisplay ()

    Display*    gdk_x11_image_get_xdisplay      (GdkImage *image);

Returns the display of a GdkImage.

`image` : |
Returns : | an Xlib Display*.

### gdk_x11_image_get_ximage ()

    XImage*     gdk_x11_image_get_ximage        (GdkImage *image);

Returns the X image belonging to a GdkImage.

`image` : | a GdkImage.
Returns : | an XImage*.

### gdk_x11_screen_get_screen_number ()

    int         gdk_x11_screen_get_screen_number
                                                (GdkScreen *screen);

Returns the index of a GdkScreen.

`screen` : | a GdkScreen.
Returns : | the position of `screen` among the screens of its display.

### gdk_x11_screen_get_xscreen ()

    Screen*     gdk_x11_screen_get_xscreen      (GdkScreen *screen);

Returns the screen of a GdkScreen.

`screen` : | a GdkScreen.
Returns : | an Xlib Screen*

### gdk_x11_ungrab_server ()

    void        gdk_x11_ungrab_server           ();

Ungrab the default display after it has been grabbed with gdk_x11_grab_server().

### gdk_x11_visual_get_xvisual ()

    Visual*     gdk_x11_visual_get_xvisual      (GdkVisual *visual);

Returns the X visual belonging to a GdkVisual.

`visual` : | a GdkVisual.
Returns : | an Xlib Visual*.

### gdk_x11_atom_to_xatom ()

    Atom        gdk_x11_atom_to_xatom           (GdkAtom atom);

Converts from a GdkAtom to the X atom for the default GDK display with the same string value.

`atom` : | A GdkAtom
Returns : | the X atom corresponding to `atom`.

### gdk_x11_atom_to_xatom_for_display ()

    Atom        gdk_x11_atom_to_xatom_for_display
                                                (GdkDisplay *display,
                                                 GdkAtom atom);

Converts from a GdkAtom to the X atom for a GdkDisplay with the same string value.

`display` : | A GdkDisplay
`atom` : | A GdkAtom
Returns : | the X atom corresponding to `atom`.

### gdk_x11_xatom_to_atom ()

    GdkAtom     gdk_x11_xatom_to_atom           (Atom xatom);

Convert from an X atom for the default display to the corresponding GdkAtom.

`xatom` : | an X atom for the default GDK display
Returns : | the corresponding GdkAtom.

### gdk_x11_xatom_to_atom_for_display ()

    GdkAtom     gdk_x11_xatom_to_atom_for_display
                                                (GdkDisplay *display,
                                                 Atom xatom);

Convert from an X atom for a GdkDisplay to the corresponding GdkAtom.

`display` : | A GdkDisplay
`xatom` : | an X atom
Returns : | the corresponding GdkAtom.

### gdk_x11_get_xatom_by_name ()

    Atom        gdk_x11_get_xatom_by_name       (const gchar *atom_name);

Returns the X atom for GDK's default display corresponding to `atom_name`. This function caches the result, so if called repeatedly it is much faster than `XInternAtom()`, which is a round trip to the server each time.

`atom_name` : | a string
Returns : | a X atom for GDK's default display.

### gdk_x11_get_xatom_by_name_for_display ()

    Atom        gdk_x11_get_xatom_by_name_for_display
                                                (GdkDisplay *display,
                                                 const gchar *atom_name);

Returns the X atom for a GdkDisplay corresponding to `atom_name`. This function caches the result, so if called repeatedly it is much faster than XInternAtom, which is a round trip to the server each time.

`display` : | a GdkDisplay
`atom_name` : | a string
Returns : | a X atom for a GdkDisplay

### gdk_x11_get_xatom_name ()

    G_CONST_RETURN gchar* gdk_x11_get_xatom_name
                                                (Atom xatom);

Returns the name of an X atom for GDK's default display. This function is meant mainly for debugging, so for convenience, unlike `XAtomName()` and gdk_atom_name(), the result doesn't need to be freed. Also, this function will never return `NULL`, even if `xatom` is invalid.

`xatom` : | an X atom for GDK's default display
Returns : | name of the X atom; this string is owned by GTK+, so it shouldn't be modifed or freed.

### gdk_x11_get_xatom_name_for_display ()

    G_CONST_RETURN gchar* gdk_x11_get_xatom_name_for_display
                                                (GdkDisplay *display,
                                                 Atom xatom);

Returns the name of an X atom for its display. This function is meant mainly for debugging, so for convenience, unlike XAtomName() and gdk_atom_name(), the result doesn't need to be freed.

`display` : | the GdkDisplay where `xatom` is defined
`xatom` : | an X atom
Returns : | name of the X atom; this string is owned by GTK+, so it shouldn't be modifed or freed.

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