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gtk2/gdk/x11/gdkscreen-x11.c
Matthias Clasen f44baf51d9 Avoid a division by zero 
It appears that xvfb returns nonsense in its xrandr resources.
Avoid a crash when that happens.

https://bugzilla.gnome.org/show_bug.cgi?id=768999
2016-07-25 08:32:24 -04:00

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/*
* gdkscreen-x11.c
*
* Copyright 2001 Sun Microsystems Inc.
*
* Erwann Chenede <erwann.chenede@sun.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gdkscreen-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkprivate-x11.h"
#include "xsettings-client.h"
#include "gdkmonitor-x11.h"
#include <glib.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xatom.h>
#ifdef HAVE_XFREE_XINERAMA
#include <X11/extensions/Xinerama.h>
#endif
#ifdef HAVE_RANDR
#include <X11/extensions/Xrandr.h>
#endif
#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif
static void gdk_x11_screen_dispose (GObject *object);
static void gdk_x11_screen_finalize (GObject *object);
static void init_randr_support (GdkScreen *screen);
enum
{
WINDOW_MANAGER_CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE (GdkX11Screen, gdk_x11_screen, GDK_TYPE_SCREEN)
typedef struct _NetWmSupportedAtoms NetWmSupportedAtoms;
struct _NetWmSupportedAtoms
{
Atom *atoms;
gulong n_atoms;
};
static void
gdk_x11_screen_init (GdkX11Screen *screen)
{
}
static GdkDisplay *
gdk_x11_screen_get_display (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->display;
}
static gint
gdk_x11_screen_get_width (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->width / GDK_X11_SCREEN (screen)->window_scale;
}
static gint
gdk_x11_screen_get_height (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->height / GDK_X11_SCREEN (screen)->window_scale;
}
static gint
gdk_x11_screen_get_width_mm (GdkScreen *screen)
{
return WidthMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
}
static gint
gdk_x11_screen_get_height_mm (GdkScreen *screen)
{
return HeightMMOfScreen (GDK_X11_SCREEN (screen)->xscreen);
}
static gint
gdk_x11_screen_get_number (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->screen_num;
}
static GdkWindow *
gdk_x11_screen_get_root_window (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->root_window;
}
static void
gdk_x11_screen_dispose (GObject *object)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
int i;
for (i = 0; i < 32; ++i)
{
if (x11_screen->subwindow_gcs[i])
{
XFreeGC (x11_screen->xdisplay, x11_screen->subwindow_gcs[i]);
x11_screen->subwindow_gcs[i] = 0;
}
}
_gdk_x11_xsettings_finish (x11_screen);
if (x11_screen->root_window)
_gdk_window_destroy (x11_screen->root_window, TRUE);
for (i = 0; i < x11_screen->nvisuals; i++)
g_object_run_dispose (G_OBJECT (x11_screen->visuals[i]));
G_OBJECT_CLASS (gdk_x11_screen_parent_class)->dispose (object);
x11_screen->xdisplay = NULL;
x11_screen->xscreen = NULL;
x11_screen->screen_num = -1;
x11_screen->xroot_window = None;
x11_screen->wmspec_check_window = None;
}
static void
gdk_x11_screen_finalize (GObject *object)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (object);
gint i;
if (x11_screen->root_window)
g_object_unref (x11_screen->root_window);
/* Visual Part */
for (i = 0; i < x11_screen->nvisuals; i++)
g_object_unref (x11_screen->visuals[i]);
g_free (x11_screen->visuals);
g_hash_table_destroy (x11_screen->visual_hash);
g_free (x11_screen->window_manager_name);
G_OBJECT_CLASS (gdk_x11_screen_parent_class)->finalize (object);
}
/**
* gdk_x11_screen_get_monitor_output:
* @screen: (type GdkX11Screen): a #GdkScreen
* @monitor_num: number of the monitor, between 0 and gdk_screen_get_n_monitors (screen)
*
* Gets the XID of the specified output/monitor.
* If the X server does not support version 1.2 of the RANDR
* extension, 0 is returned.
*
* Returns: the XID of the monitor
*
* Since: 2.14
*/
XID
gdk_x11_screen_get_monitor_output (GdkScreen *screen,
gint monitor_num)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
GdkX11Display *x11_display = GDK_X11_DISPLAY (x11_screen->display);
GdkX11Monitor *monitor;
g_return_val_if_fail (GDK_IS_SCREEN (screen), None);
g_return_val_if_fail (monitor_num >= 0, None);
g_return_val_if_fail (monitor_num < x11_display->monitors->len, None);
monitor = x11_display->monitors->pdata[monitor_num];
return monitor->output;
}
static int
get_current_desktop (GdkScreen *screen)
{
Display *display;
Window win;
Atom current_desktop, type;
int format;
unsigned long n_items, bytes_after;
unsigned char *data_return = NULL;
int workspace = 0;
if (!gdk_x11_screen_supports_net_wm_hint (screen,
gdk_atom_intern_static_string ("_NET_CURRENT_DESKTOP")))
return workspace;
display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (screen));
win = XRootWindow (display, GDK_SCREEN_XNUMBER (screen));
current_desktop = XInternAtom (display, "_NET_CURRENT_DESKTOP", True);
XGetWindowProperty (display,
win,
current_desktop,
0, G_MAXLONG,
False, XA_CARDINAL,
&type, &format, &n_items, &bytes_after,
&data_return);
if (type == XA_CARDINAL && format == 32 && n_items > 0)
workspace = ((long *) data_return)[0];
if (data_return)
XFree (data_return);
return workspace;
}
void
gdk_x11_screen_get_work_area (GdkScreen *screen,
GdkRectangle *area)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
Atom workarea;
Atom type;
Window win;
int format;
gulong num;
gulong leftovers;
gulong max_len = 4 * 32;
guchar *ret_workarea = NULL;
long *workareas;
int result;
int disp_screen;
int desktop;
Display *display;
display = GDK_DISPLAY_XDISPLAY (gdk_screen_get_display (screen));
disp_screen = GDK_SCREEN_XNUMBER (screen);
workarea = XInternAtom (display, "_NET_WORKAREA", True);
/* Defaults in case of error */
area->x = 0;
area->y = 0;
area->width = gdk_screen_get_width (screen);
area->height = gdk_screen_get_height (screen);
if (!gdk_x11_screen_supports_net_wm_hint (screen,
gdk_atom_intern_static_string ("_NET_WORKAREA")))
return;
if (workarea == None)
return;
win = XRootWindow (display, disp_screen);
result = XGetWindowProperty (display,
win,
workarea,
0,
max_len,
False,
AnyPropertyType,
&type,
&format,
&num,
&leftovers,
&ret_workarea);
if (result != Success ||
type == None ||
format == 0 ||
leftovers ||
num % 4 != 0)
goto out;
desktop = get_current_desktop (screen);
if (desktop + 1 > num / 4) /* fvwm gets this wrong */
goto out;
workareas = (long *) ret_workarea;
area->x = workareas[desktop * 4];
area->y = workareas[desktop * 4 + 1];
area->width = workareas[desktop * 4 + 2];
area->height = workareas[desktop * 4 + 3];
area->x /= x11_screen->window_scale;
area->y /= x11_screen->window_scale;
area->width /= x11_screen->window_scale;
area->height /= x11_screen->window_scale;
out:
if (ret_workarea)
XFree (ret_workarea);
}
static GdkVisual *
gdk_x11_screen_get_rgba_visual (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
return x11_screen->rgba_visual;
}
/**
* gdk_x11_screen_get_xscreen:
* @screen: (type GdkX11Screen): a #GdkScreen
*
* Returns the screen of a #GdkScreen.
*
* Returns: (transfer none): an Xlib Screen*
*
* Since: 2.2
*/
Screen *
gdk_x11_screen_get_xscreen (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->xscreen;
}
/**
* gdk_x11_screen_get_screen_number:
* @screen: (type GdkX11Screen): a #GdkScreen
*
* Returns the index of a #GdkScreen.
*
* Returns: the position of @screen among the screens
* of its display
*
* Since: 2.2
*/
int
gdk_x11_screen_get_screen_number (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->screen_num;
}
static Atom
get_cm_atom (GdkX11Screen *x11_screen)
{
return _gdk_x11_get_xatom_for_display_printf (x11_screen->display, "_NET_WM_CM_S%d", x11_screen->screen_num);
}
static gboolean
check_is_composited (GdkDisplay *display,
GdkX11Screen *x11_screen)
{
Window xwindow;
xwindow = XGetSelectionOwner (GDK_DISPLAY_XDISPLAY (display), get_cm_atom (x11_screen));
return xwindow != None;
}
static GdkX11Monitor *
find_monitor_by_output (GdkX11Display *x11_display, XID output)
{
int i;
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->output == output)
return monitor;
}
return NULL;
}
static GdkSubpixelLayout
translate_subpixel_order (int subpixel)
{
switch (subpixel)
{
case 1: return GDK_SUBPIXEL_LAYOUT_HORIZONTAL_RGB;
case 2: return GDK_SUBPIXEL_LAYOUT_HORIZONTAL_BGR;
case 3: return GDK_SUBPIXEL_LAYOUT_VERTICAL_RGB;
case 4: return GDK_SUBPIXEL_LAYOUT_VERTICAL_BGR;
case 5: return GDK_SUBPIXEL_LAYOUT_NONE;
default: return GDK_SUBPIXEL_LAYOUT_UNKNOWN;
}
}
static gboolean
init_randr15 (GdkScreen *screen, gboolean *changed)
{
#ifdef HAVE_RANDR15
GdkDisplay *display = gdk_screen_get_display (screen);
GdkX11Display *x11_display = GDK_X11_DISPLAY (display);
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
XRRScreenResources *resources;
RROutput primary_output = None;
RROutput first_output = None;
int i;
gboolean randr12_compat = FALSE;
XRRMonitorInfo *rr_monitors;
int num_rr_monitors;
int old_primary;
if (!x11_display->have_randr15)
return FALSE;
resources = XRRGetScreenResourcesCurrent (x11_screen->xdisplay,
x11_screen->xroot_window);
if (!resources)
return FALSE;
rr_monitors = XRRGetMonitors (x11_screen->xdisplay,
x11_screen->xroot_window,
True,
&num_rr_monitors);
if (!rr_monitors)
return FALSE;
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
monitor->add = FALSE;
monitor->remove = TRUE;
}
for (i = 0; i < num_rr_monitors; i++)
{
RROutput output = rr_monitors[i].outputs[0];
XRROutputInfo *output_info;
GdkX11Monitor *monitor;
GdkRectangle geometry;
GdkRectangle newgeo;
char *name;
int refresh_rate = 0;
gdk_x11_display_error_trap_push (display);
output_info = XRRGetOutputInfo (x11_screen->xdisplay, resources, output);
if (gdk_x11_display_error_trap_pop (display))
continue;
if (output_info == NULL)
continue;
/* Non RandR1.2+ X driver have output name "default" */
randr12_compat |= !g_strcmp0 (output_info->name, "default");
if (output_info->connection == RR_Disconnected)
{
XRRFreeOutputInfo (output_info);
continue;
}
if (first_output == None)
first_output = output;
if (output_info->crtc)
{
XRRCrtcInfo *crtc = XRRGetCrtcInfo (x11_screen->xdisplay, resources, output_info->crtc);
int j;
for (j = 0; j < resources->nmode; j++)
{
XRRModeInfo *xmode = &resources->modes[j];
if (xmode->id == crtc->mode)
{
if (xmode->hTotal != 0 && xmode->vTotal != 0)
refresh_rate = (1000 * xmode->dotClock) / (xmode->hTotal * xmode->vTotal);
break;
}
}
XRRFreeCrtcInfo (crtc);
}
monitor = find_monitor_by_output (x11_display, output);
if (monitor)
monitor->remove = FALSE;
else
{
monitor = g_object_new (GDK_TYPE_X11_MONITOR,
"display", display,
NULL);
monitor->output = output;
monitor->add = TRUE;
g_ptr_array_add (x11_display->monitors, monitor);
}
gdk_monitor_get_geometry (GDK_MONITOR (monitor), &geometry);
name = g_strndup (output_info->name, output_info->nameLen);
newgeo.x = rr_monitors[i].x / x11_screen->window_scale;
newgeo.y = rr_monitors[i].y / x11_screen->window_scale;
newgeo.width = rr_monitors[i].width / x11_screen->window_scale;
newgeo.height = rr_monitors[i].height / x11_screen->window_scale;
if (newgeo.x != geometry.x ||
newgeo.y != geometry.y ||
newgeo.width != geometry.width ||
newgeo.height != geometry.height ||
rr_monitors[i].mwidth != gdk_monitor_get_width_mm (GDK_MONITOR (monitor)) ||
rr_monitors[i].mheight != gdk_monitor_get_height_mm (GDK_MONITOR (monitor)) ||
g_strcmp0 (name, gdk_monitor_get_model (GDK_MONITOR (monitor))))
*changed = TRUE;
gdk_monitor_set_position (GDK_MONITOR (monitor), newgeo.x, newgeo.y);
gdk_monitor_set_size (GDK_MONITOR (monitor), newgeo.width, newgeo.height);
g_object_notify (G_OBJECT (monitor), "workarea");
gdk_monitor_set_physical_size (GDK_MONITOR (monitor),
rr_monitors[i].mwidth,
rr_monitors[i].mheight);
gdk_monitor_set_subpixel_layout (GDK_MONITOR (monitor),
translate_subpixel_order (output_info->subpixel_order));
gdk_monitor_set_refresh_rate (GDK_MONITOR (monitor), refresh_rate);
gdk_monitor_set_scale_factor (GDK_MONITOR (monitor), x11_screen->window_scale);
gdk_monitor_set_model (GDK_MONITOR (monitor), name);
g_free (name);
if (rr_monitors[i].primary)
primary_output = monitor->output;
XRRFreeOutputInfo (output_info);
}
XRRFreeMonitors (rr_monitors);
XRRFreeScreenResources (resources);
/* non RandR 1.2+ X driver doesn't return any usable multihead data */
if (randr12_compat)
{
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->remove)
gdk_display_monitor_removed (display, GDK_MONITOR (monitor));
}
g_ptr_array_remove_range (x11_display->monitors, 0, x11_display->monitors->len);
return FALSE;
}
for (i = x11_display->monitors->len - 1; i >= 0; i--)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->add)
{
gdk_display_monitor_added (display, GDK_MONITOR (monitor));
*changed = TRUE;
}
else if (monitor->remove)
{
g_object_ref (monitor);
g_ptr_array_remove (x11_display->monitors, monitor);
gdk_display_monitor_removed (display, GDK_MONITOR (monitor));
g_object_unref (monitor);
*changed = TRUE;
}
}
old_primary = x11_display->primary_monitor;
x11_display->primary_monitor = 0;
for (i = 0; i < x11_display->monitors->len; ++i)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->output == primary_output)
{
x11_display->primary_monitor = i;
break;
}
/* No RandR1.3+ available or no primary set, fall back to prefer LVDS as primary if present */
if (primary_output == None &&
g_ascii_strncasecmp (gdk_monitor_get_model (GDK_MONITOR (monitor)), "LVDS", 4) == 0)
{
x11_display->primary_monitor = i;
break;
}
/* No primary specified and no LVDS found */
if (monitor->output == first_output)
x11_display->primary_monitor = i;
}
if (x11_display->primary_monitor != old_primary)
*changed = TRUE;
return x11_display->monitors->len > 0;
#endif
return FALSE;
}
static gboolean
init_randr13 (GdkScreen *screen, gboolean *changed)
{
#ifdef HAVE_RANDR
GdkDisplay *display = gdk_screen_get_display (screen);
GdkX11Display *x11_display = GDK_X11_DISPLAY (display);
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
XRRScreenResources *resources;
RROutput primary_output = None;
RROutput first_output = None;
int i;
gboolean randr12_compat = FALSE;
int old_primary;
if (!x11_display->have_randr13)
return FALSE;
resources = XRRGetScreenResourcesCurrent (x11_screen->xdisplay,
x11_screen->xroot_window);
if (!resources)
return FALSE;
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
monitor->add = FALSE;
monitor->remove = TRUE;
}
for (i = 0; i < resources->noutput; ++i)
{
RROutput output = resources->outputs[i];
XRROutputInfo *output_info =
XRRGetOutputInfo (x11_screen->xdisplay, resources, output);
/* Non RandR1.2+ X driver have output name "default" */
randr12_compat |= !g_strcmp0 (output_info->name, "default");
if (output_info->connection == RR_Disconnected)
{
XRRFreeOutputInfo (output_info);
continue;
}
if (output_info->crtc)
{
GdkX11Monitor *monitor;
XRRCrtcInfo *crtc = XRRGetCrtcInfo (x11_screen->xdisplay, resources, output_info->crtc);
char *name;
GdkRectangle geometry;
GdkRectangle newgeo;
int j;
int refresh_rate = 0;
for (j = 0; j < resources->nmode; j++)
{
XRRModeInfo *xmode = &resources->modes[j];
if (xmode->id == crtc->mode)
{
refresh_rate = (1000 * xmode->dotClock) / (xmode->hTotal *xmode->vTotal);
break;
}
}
monitor = find_monitor_by_output (x11_display, output);
if (monitor)
monitor->remove = FALSE;
else
{
monitor = g_object_new (gdk_x11_monitor_get_type (),
"display", display,
NULL);
monitor->output = output;
monitor->add = TRUE;
g_ptr_array_add (x11_display->monitors, monitor);
}
gdk_monitor_get_geometry (GDK_MONITOR (monitor), &geometry);
name = g_strndup (output_info->name, output_info->nameLen);
newgeo.x = crtc->x / x11_screen->window_scale;
newgeo.y = crtc->y / x11_screen->window_scale;
newgeo.width = crtc->width / x11_screen->window_scale;
newgeo.height = crtc->height / x11_screen->window_scale;
if (newgeo.x != geometry.x ||
newgeo.y != geometry.y ||
newgeo.width != geometry.width ||
newgeo.height != geometry.height ||
output_info->mm_width != gdk_monitor_get_width_mm (GDK_MONITOR (monitor)) ||
output_info->mm_height != gdk_monitor_get_height_mm (GDK_MONITOR (monitor)) ||
g_strcmp0 (name, gdk_monitor_get_model (GDK_MONITOR (monitor))) != 0)
*changed = TRUE;
gdk_monitor_set_position (GDK_MONITOR (monitor), newgeo.x, newgeo.y);
gdk_monitor_set_size (GDK_MONITOR (monitor), newgeo.width, newgeo.height);
g_object_notify (G_OBJECT (monitor), "workarea");
gdk_monitor_set_physical_size (GDK_MONITOR (monitor),
output_info->mm_width,
output_info->mm_height);
gdk_monitor_set_subpixel_layout (GDK_MONITOR (monitor),
translate_subpixel_order (output_info->subpixel_order));
gdk_monitor_set_refresh_rate (GDK_MONITOR (monitor), refresh_rate);
gdk_monitor_set_scale_factor (GDK_MONITOR (monitor), x11_screen->window_scale);
gdk_monitor_set_model (GDK_MONITOR (monitor), name);
g_free (name);
XRRFreeCrtcInfo (crtc);
}
XRRFreeOutputInfo (output_info);
}
if (resources->noutput > 0)
first_output = resources->outputs[0];
XRRFreeScreenResources (resources);
if (randr12_compat)
{
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->remove)
gdk_display_monitor_removed (display, GDK_MONITOR (monitor));
}
g_ptr_array_remove_range (x11_display->monitors, 0, x11_display->monitors->len);
return FALSE;
}
for (i = x11_display->monitors->len - 1; i >= 0; i--)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->add)
{
gdk_display_monitor_added (display, GDK_MONITOR (monitor));
*changed = TRUE;
}
else if (monitor->remove)
{
g_object_ref (monitor);
g_ptr_array_remove (x11_display->monitors, monitor);
gdk_display_monitor_removed (display, GDK_MONITOR (monitor));
g_object_unref (monitor);
*changed = TRUE;
}
}
old_primary = x11_display->primary_monitor;
x11_display->primary_monitor = 0;
primary_output = XRRGetOutputPrimary (x11_screen->xdisplay,
x11_screen->xroot_window);
for (i = 0; i < x11_display->monitors->len; ++i)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->output == primary_output)
{
x11_display->primary_monitor = i;
break;
}
/* No RandR1.3+ available or no primary set, fall back to prefer LVDS as primary if present */
if (primary_output == None &&
g_ascii_strncasecmp (gdk_monitor_get_model (GDK_MONITOR (monitor)), "LVDS", 4) == 0)
{
x11_display->primary_monitor = i;
break;
}
/* No primary specified and no LVDS found */
if (monitor->output == first_output)
x11_display->primary_monitor = i;
}
if (x11_display->primary_monitor != old_primary)
*changed = TRUE;
return x11_display->monitors->len > 0;
#endif
return FALSE;
}
static void
init_no_multihead (GdkScreen *screen, gboolean *changed)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
GdkX11Display *x11_display = GDK_X11_DISPLAY (x11_screen->display);
GdkX11Monitor *monitor;
GdkRectangle geometry;
int i;
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
monitor->add = FALSE;
monitor->remove = TRUE;
}
monitor = find_monitor_by_output (x11_display, 0);
if (monitor)
monitor->remove = FALSE;
else
{
monitor = g_object_new (gdk_x11_monitor_get_type (),
"display", x11_display,
NULL);
monitor->output = 0;
monitor->add = TRUE;
g_ptr_array_add (x11_display->monitors, monitor);
}
gdk_monitor_get_geometry (GDK_MONITOR (monitor), &geometry);
if (0 != geometry.x ||
0 != geometry.y ||
gdk_screen_get_width (screen) != geometry.width ||
gdk_screen_get_height (screen) != geometry.height ||
gdk_screen_get_width_mm (screen) != gdk_monitor_get_width_mm (GDK_MONITOR (monitor)) ||
gdk_screen_get_height_mm (screen) != gdk_monitor_get_height_mm (GDK_MONITOR (monitor)))
*changed = TRUE;
gdk_monitor_set_position (GDK_MONITOR (monitor), 0, 0);
gdk_monitor_set_size (GDK_MONITOR (monitor),
gdk_screen_get_width (screen),
gdk_screen_get_height (screen));
g_object_notify (G_OBJECT (monitor), "workarea");
gdk_monitor_set_physical_size (GDK_MONITOR (monitor),
gdk_screen_get_height_mm (screen),
gdk_screen_get_height_mm (screen));
gdk_monitor_set_scale_factor (GDK_MONITOR (monitor), x11_screen->window_scale);
if (x11_display->primary_monitor != 0)
*changed = TRUE;
x11_display->primary_monitor = 0;
for (i = x11_display->monitors->len - 1; i >= 0; i--)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
if (monitor->add)
{
gdk_display_monitor_added (GDK_DISPLAY (x11_display), GDK_MONITOR (monitor));
*changed = TRUE;
}
else if (monitor->remove)
{
g_object_ref (monitor);
g_ptr_array_remove (x11_display->monitors, monitor);
gdk_display_monitor_removed (GDK_DISPLAY (x11_display), GDK_MONITOR (monitor));
g_object_unref (monitor);
*changed = TRUE;
}
}
}
static gboolean
init_multihead (GdkScreen *screen)
{
gboolean any_changed = FALSE;
if (!init_randr15 (screen, &any_changed) &&
!init_randr13 (screen, &any_changed))
init_no_multihead (screen, &any_changed);
return any_changed;
}
static void
update_bounding_box (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
GdkX11Display *x11_display = GDK_X11_DISPLAY (x11_screen->display);
gint i, x1, y1, x2, y2;
x1 = y1 = G_MAXINT;
x2 = y2 = G_MININT;
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkX11Monitor *monitor = x11_display->monitors->pdata[i];
GdkRectangle geometry;
gdk_monitor_get_geometry (GDK_MONITOR (monitor), &geometry);
x1 = MIN (x1, geometry.x);
y1 = MIN (y1, geometry.y);
x2 = MAX (x2, geometry.x + geometry.width);
y2 = MAX (y2, geometry.y + geometry.height);
}
x11_screen->width = x2 - x1;
x11_screen->height = y2 - y1;
}
GdkScreen *
_gdk_x11_screen_new (GdkDisplay *display,
gint screen_number)
{
GdkScreen *screen;
GdkX11Screen *x11_screen;
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
const char *scale_str;
screen = g_object_new (GDK_TYPE_X11_SCREEN, NULL);
x11_screen = GDK_X11_SCREEN (screen);
x11_screen->display = display;
x11_screen->xdisplay = display_x11->xdisplay;
x11_screen->xscreen = ScreenOfDisplay (display_x11->xdisplay, screen_number);
x11_screen->screen_num = screen_number;
x11_screen->xroot_window = RootWindow (display_x11->xdisplay,screen_number);
x11_screen->wmspec_check_window = None;
/* we want this to be always non-null */
x11_screen->window_manager_name = g_strdup ("unknown");
scale_str = g_getenv ("GDK_SCALE");
if (scale_str)
{
x11_screen->fixed_window_scale = TRUE;
x11_screen->window_scale = atol (scale_str);
if (x11_screen->window_scale == 0)
x11_screen->window_scale = 1;
}
else
x11_screen->window_scale = 1;
init_randr_support (screen);
init_multihead (screen);
_gdk_x11_screen_init_visuals (screen);
_gdk_x11_screen_init_root_window (screen);
update_bounding_box (screen);
return screen;
}
void
_gdk_x11_screen_set_window_scale (GdkX11Screen *x11_screen,
gint scale)
{
GdkX11Display *x11_display = GDK_X11_DISPLAY (x11_screen->display);
GList *toplevels, *l;
GdkWindow *root;
int i;
if (x11_screen->window_scale == scale)
return;
x11_screen->window_scale = scale;
root = x11_screen->root_window;
GDK_WINDOW_IMPL_X11 (root->impl)->window_scale = scale;
toplevels = gdk_screen_get_toplevel_windows (GDK_SCREEN (x11_screen));
for (l = toplevels; l != NULL; l = l->next)
{
GdkWindow *window = l->data;
_gdk_x11_window_set_window_scale (window, scale);
}
for (i = 0; i < x11_display->monitors->len; i++)
{
GdkMonitor *monitor = GDK_MONITOR (x11_display->monitors->pdata[i]);
gdk_monitor_set_scale_factor (monitor, scale);
}
g_signal_emit_by_name (GDK_SCREEN (x11_screen), "monitors-changed");
}
/*
* It is important that we first request the selection
* notification, and then setup the initial state of
* is_composited to avoid a race condition here.
*/
void
_gdk_x11_screen_setup (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
gdk_display_request_selection_notification (x11_screen->display,
gdk_x11_xatom_to_atom_for_display (x11_screen->display, get_cm_atom (x11_screen)));
x11_screen->is_composited = check_is_composited (x11_screen->display, x11_screen);
}
static gboolean
gdk_x11_screen_is_composited (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
return x11_screen->is_composited;
}
static void
init_randr_support (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
/* NB: This is also needed for XSettings, so don't remove. */
XSelectInput (GDK_SCREEN_XDISPLAY (screen),
x11_screen->xroot_window,
StructureNotifyMask);
#ifdef HAVE_RANDR
if (!GDK_X11_DISPLAY (gdk_screen_get_display (screen))->have_randr12)
return;
XRRSelectInput (GDK_SCREEN_XDISPLAY (screen),
x11_screen->xroot_window,
RRScreenChangeNotifyMask
| RRCrtcChangeNotifyMask
| RROutputPropertyNotifyMask);
#endif
}
static void
process_monitors_change (GdkScreen *screen)
{
if (init_multihead (screen))
{
update_bounding_box (screen);
g_signal_emit_by_name (screen, "monitors-changed");
}
}
void
_gdk_x11_screen_size_changed (GdkScreen *screen,
XEvent *event)
{
gint width, height;
#ifdef HAVE_RANDR
GdkX11Display *display_x11;
#endif
width = gdk_screen_get_width (screen);
height = gdk_screen_get_height (screen);
#ifdef HAVE_RANDR
display_x11 = GDK_X11_DISPLAY (gdk_screen_get_display (screen));
if (display_x11->have_randr13 && event->type == ConfigureNotify)
return;
XRRUpdateConfiguration (event);
#else
if (event->type == ConfigureNotify)
{
XConfigureEvent *rcevent = (XConfigureEvent *) event;
Screen *xscreen = gdk_x11_screen_get_xscreen (screen);
xscreen->width = rcevent->width;
xscreen->height = rcevent->height;
}
else
return;
#endif
process_monitors_change (screen);
if (width != gdk_screen_get_width (screen) ||
height != gdk_screen_get_height (screen))
g_signal_emit_by_name (screen, "size-changed");
}
void
_gdk_x11_screen_get_edge_monitors (GdkScreen *screen,
gint *top,
gint *bottom,
gint *left,
gint *right)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
gint top_most_pos = x11_screen->height;
gint left_most_pos = x11_screen->width;
gint bottom_most_pos = 0;
gint right_most_pos = 0;
gint i;
#ifdef HAVE_XFREE_XINERAMA
XineramaScreenInfo *x_monitors;
int x_n_monitors;
#endif
*top = *bottom = *left = *right = -1;
#ifdef HAVE_XFREE_XINERAMA
if (!XineramaIsActive (x11_screen->xdisplay))
return;
x_monitors = XineramaQueryScreens (x11_screen->xdisplay, &x_n_monitors);
if (x_n_monitors <= 0 || x_monitors == NULL)
{
if (x_monitors)
XFree (x_monitors);
return;
}
for (i = 0; i < x_n_monitors; i++)
{
if (left && left_most_pos > x_monitors[i].x_org)
{
left_most_pos = x_monitors[i].x_org;
*left = i;
}
if (right && right_most_pos < x_monitors[i].x_org + x_monitors[i].width)
{
right_most_pos = x_monitors[i].x_org + x_monitors[i].width;
*right = i;
}
if (top && top_most_pos > x_monitors[i].y_org)
{
top_most_pos = x_monitors[i].y_org;
*top = i;
}
if (bottom && bottom_most_pos < x_monitors[i].y_org + x_monitors[i].height)
{
bottom_most_pos = x_monitors[i].y_org + x_monitors[i].height;
*bottom = i;
}
}
XFree (x_monitors);
#endif
}
void
_gdk_x11_screen_window_manager_changed (GdkScreen *screen)
{
g_signal_emit (screen, signals[WINDOW_MANAGER_CHANGED], 0);
}
void
_gdk_x11_screen_process_owner_change (GdkScreen *screen,
XEvent *event)
{
#ifdef HAVE_XFIXES
XFixesSelectionNotifyEvent *selection_event = (XFixesSelectionNotifyEvent *)event;
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
if (selection_event->selection == get_cm_atom (x11_screen))
{
gboolean composited = selection_event->owner != None;
if (composited != x11_screen->is_composited)
{
x11_screen->is_composited = composited;
g_signal_emit_by_name (screen, "composited-changed");
}
}
#endif
}
static gchar *
substitute_screen_number (const gchar *display_name,
gint screen_number)
{
GString *str;
gchar *p;
str = g_string_new (display_name);
p = strrchr (str->str, '.');
if (p && p > strchr (str->str, ':'))
g_string_truncate (str, p - str->str);
g_string_append_printf (str, ".%d", screen_number);
return g_string_free (str, FALSE);
}
static gchar *
gdk_x11_screen_make_display_name (GdkScreen *screen)
{
const gchar *old_display;
old_display = gdk_display_get_name (gdk_screen_get_display (screen));
return substitute_screen_number (old_display,
gdk_screen_get_number (screen));
}
static GdkWindow *
gdk_x11_screen_get_active_window (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
GdkWindow *ret = NULL;
Atom type_return;
gint format_return;
gulong nitems_return;
gulong bytes_after_return;
guchar *data = NULL;
if (!gdk_x11_screen_supports_net_wm_hint (screen,
gdk_atom_intern_static_string ("_NET_ACTIVE_WINDOW")))
return NULL;
if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
"_NET_ACTIVE_WINDOW"),
0, 1, False, XA_WINDOW, &type_return,
&format_return, &nitems_return,
&bytes_after_return, &data)
== Success)
{
if ((type_return == XA_WINDOW) && (format_return == 32) && (data))
{
Window window = *(Window *) data;
if (window != None)
{
ret = gdk_x11_window_foreign_new_for_display (x11_screen->display,
window);
}
}
}
if (data)
XFree (data);
return ret;
}
static GList *
gdk_x11_screen_get_window_stack (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
GList *ret = NULL;
Atom type_return;
gint format_return;
gulong nitems_return;
gulong bytes_after_return;
guchar *data = NULL;
if (!gdk_x11_screen_supports_net_wm_hint (screen,
gdk_atom_intern_static_string ("_NET_CLIENT_LIST_STACKING")))
return NULL;
if (XGetWindowProperty (x11_screen->xdisplay, x11_screen->xroot_window,
gdk_x11_get_xatom_by_name_for_display (x11_screen->display,
"_NET_CLIENT_LIST_STACKING"),
0, G_MAXLONG, False, XA_WINDOW, &type_return,
&format_return, &nitems_return,
&bytes_after_return, &data)
== Success)
{
if ((type_return == XA_WINDOW) && (format_return == 32) &&
(data) && (nitems_return > 0))
{
gulong *stack = (gulong *) data;
GdkWindow *win;
int i;
for (i = 0; i < nitems_return; i++)
{
win = gdk_x11_window_foreign_new_for_display (x11_screen->display,
(Window)stack[i]);
if (win != NULL)
ret = g_list_append (ret, win);
}
}
}
if (data)
XFree (data);
return ret;
}
static gboolean
gdk_x11_screen_get_setting (GdkScreen *screen,
const gchar *name,
GValue *value)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
const GValue *setting;
if (x11_screen->xsettings == NULL)
goto out;
setting = g_hash_table_lookup (x11_screen->xsettings, name);
if (setting == NULL)
goto out;
if (!g_value_transform (setting, value))
{
g_warning ("Cannot transform xsetting %s of type %s to type %s\n",
name,
g_type_name (G_VALUE_TYPE (setting)),
g_type_name (G_VALUE_TYPE (value)));
goto out;
}
return TRUE;
out:
return _gdk_x11_get_xft_setting (screen, name, value);
}
static void
cleanup_atoms(gpointer data)
{
NetWmSupportedAtoms *supported_atoms = data;
if (supported_atoms->atoms)
XFree (supported_atoms->atoms);
g_free (supported_atoms);
}
static Window
get_net_supporting_wm_check (GdkX11Screen *screen,
Window window)
{
GdkDisplay *display;
Atom type;
gint format;
gulong n_items;
gulong bytes_after;
guchar *data;
Window value;
display = screen->display;
type = None;
data = NULL;
value = None;
gdk_x11_display_error_trap_push (display);
XGetWindowProperty (screen->xdisplay, window,
gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTING_WM_CHECK"),
0, G_MAXLONG, False, XA_WINDOW, &type, &format,
&n_items, &bytes_after, &data);
gdk_x11_display_error_trap_pop_ignored (display);
if (type == XA_WINDOW)
value = *(Window *)data;
if (data)
XFree (data);
return value;
}
static void
fetch_net_wm_check_window (GdkScreen *screen)
{
GdkX11Screen *x11_screen;
GdkDisplay *display;
Window window;
GTimeVal tv;
gint error;
x11_screen = GDK_X11_SCREEN (screen);
display = x11_screen->display;
g_return_if_fail (GDK_X11_DISPLAY (display)->trusted_client);
if (x11_screen->wmspec_check_window != None)
return; /* already have it */
g_get_current_time (&tv);
if (ABS (tv.tv_sec - x11_screen->last_wmspec_check_time) < 15)
return; /* we've checked recently */
window = get_net_supporting_wm_check (x11_screen, x11_screen->xroot_window);
if (window == None)
return;
if (window != get_net_supporting_wm_check (x11_screen, window))
return;
gdk_x11_display_error_trap_push (display);
/* Find out if this WM goes away, so we can reset everything. */
XSelectInput (x11_screen->xdisplay, window, StructureNotifyMask);
error = gdk_x11_display_error_trap_pop (display);
if (!error)
{
/* We check the window property again because after XGetWindowProperty()
* and before XSelectInput() the window may have been recycled in such a
* way that XSelectInput() doesn't fail but the window is no longer what
* we want.
*/
if (window != get_net_supporting_wm_check (x11_screen, window))
return;
x11_screen->wmspec_check_window = window;
x11_screen->last_wmspec_check_time = tv.tv_sec;
x11_screen->need_refetch_net_supported = TRUE;
x11_screen->need_refetch_wm_name = TRUE;
/* Careful, reentrancy */
_gdk_x11_screen_window_manager_changed (screen);
}
}
/**
* gdk_x11_screen_supports_net_wm_hint:
* @screen: (type GdkX11Screen): the relevant #GdkScreen.
* @property: a property atom.
*
* 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](http://www.freedesktop.org/Standards/wm-spec) specification.
*
* 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.
* You can monitor the window_manager_changed signal on #GdkScreen to detect
* a window manager change.
*
* Returns: %TRUE if the window manager supports @property
*
* Since: 2.2
**/
gboolean
gdk_x11_screen_supports_net_wm_hint (GdkScreen *screen,
GdkAtom property)
{
gulong i;
GdkX11Screen *x11_screen;
NetWmSupportedAtoms *supported_atoms;
GdkDisplay *display;
Atom atom;
g_return_val_if_fail (GDK_IS_SCREEN (screen), FALSE);
x11_screen = GDK_X11_SCREEN (screen);
display = x11_screen->display;
if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
return FALSE;
supported_atoms = g_object_get_data (G_OBJECT (screen), "gdk-net-wm-supported-atoms");
if (!supported_atoms)
{
supported_atoms = g_new0 (NetWmSupportedAtoms, 1);
g_object_set_data_full (G_OBJECT (screen), "gdk-net-wm-supported-atoms", supported_atoms, cleanup_atoms);
}
fetch_net_wm_check_window (screen);
if (x11_screen->wmspec_check_window == None)
return FALSE;
if (x11_screen->need_refetch_net_supported)
{
/* WM has changed since we last got the supported list,
* refetch it.
*/
Atom type;
gint format;
gulong bytes_after;
x11_screen->need_refetch_net_supported = FALSE;
if (supported_atoms->atoms)
XFree (supported_atoms->atoms);
supported_atoms->atoms = NULL;
supported_atoms->n_atoms = 0;
XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), x11_screen->xroot_window,
gdk_x11_get_xatom_by_name_for_display (display, "_NET_SUPPORTED"),
0, G_MAXLONG, False, XA_ATOM, &type, &format,
&supported_atoms->n_atoms, &bytes_after,
(guchar **)&supported_atoms->atoms);
if (type != XA_ATOM)
return FALSE;
}
if (supported_atoms->atoms == NULL)
return FALSE;
atom = gdk_x11_atom_to_xatom_for_display (display, property);
for (i = 0; i < supported_atoms->n_atoms; i++)
{
if (supported_atoms->atoms[i] == atom)
return TRUE;
}
return FALSE;
}
/**
* gdk_x11_screen_get_window_manager_name:
* @screen: (type GdkX11Screen): a #GdkScreen
*
* Returns the name of the window manager for @screen.
*
* Returns: the name of the window manager screen @screen, or
* "unknown" if the window manager is unknown. The string is owned by GDK
* and should not be freed.
*
* Since: 2.2
**/
const char*
gdk_x11_screen_get_window_manager_name (GdkScreen *screen)
{
GdkX11Screen *x11_screen;
GdkDisplay *display;
x11_screen = GDK_X11_SCREEN (screen);
display = x11_screen->display;
if (!G_LIKELY (GDK_X11_DISPLAY (display)->trusted_client))
return x11_screen->window_manager_name;
fetch_net_wm_check_window (screen);
if (x11_screen->need_refetch_wm_name)
{
/* Get the name of the window manager */
x11_screen->need_refetch_wm_name = FALSE;
g_free (x11_screen->window_manager_name);
x11_screen->window_manager_name = g_strdup ("unknown");
if (x11_screen->wmspec_check_window != None)
{
Atom type;
gint format;
gulong n_items;
gulong bytes_after;
gchar *name;
name = NULL;
gdk_x11_display_error_trap_push (display);
XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
x11_screen->wmspec_check_window,
gdk_x11_get_xatom_by_name_for_display (display,
"_NET_WM_NAME"),
0, G_MAXLONG, False,
gdk_x11_get_xatom_by_name_for_display (display,
"UTF8_STRING"),
&type, &format,
&n_items, &bytes_after,
(guchar **)&name);
gdk_x11_display_error_trap_pop_ignored (display);
if (name != NULL)
{
g_free (x11_screen->window_manager_name);
x11_screen->window_manager_name = g_strdup (name);
XFree (name);
}
}
}
return GDK_X11_SCREEN (screen)->window_manager_name;
}
static void
gdk_x11_screen_class_init (GdkX11ScreenClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GdkScreenClass *screen_class = GDK_SCREEN_CLASS (klass);
object_class->dispose = gdk_x11_screen_dispose;
object_class->finalize = gdk_x11_screen_finalize;
screen_class->get_display = gdk_x11_screen_get_display;
screen_class->get_width = gdk_x11_screen_get_width;
screen_class->get_height = gdk_x11_screen_get_height;
screen_class->get_width_mm = gdk_x11_screen_get_width_mm;
screen_class->get_height_mm = gdk_x11_screen_get_height_mm;
screen_class->get_number = gdk_x11_screen_get_number;
screen_class->get_root_window = gdk_x11_screen_get_root_window;
screen_class->get_system_visual = _gdk_x11_screen_get_system_visual;
screen_class->get_rgba_visual = gdk_x11_screen_get_rgba_visual;
screen_class->is_composited = gdk_x11_screen_is_composited;
screen_class->make_display_name = gdk_x11_screen_make_display_name;
screen_class->get_active_window = gdk_x11_screen_get_active_window;
screen_class->get_window_stack = gdk_x11_screen_get_window_stack;
screen_class->get_setting = gdk_x11_screen_get_setting;
screen_class->visual_get_best_depth = _gdk_x11_screen_visual_get_best_depth;
screen_class->visual_get_best_type = _gdk_x11_screen_visual_get_best_type;
screen_class->visual_get_best = _gdk_x11_screen_visual_get_best;
screen_class->visual_get_best_with_depth = _gdk_x11_screen_visual_get_best_with_depth;
screen_class->visual_get_best_with_type = _gdk_x11_screen_visual_get_best_with_type;
screen_class->visual_get_best_with_both = _gdk_x11_screen_visual_get_best_with_both;
screen_class->query_depths = _gdk_x11_screen_query_depths;
screen_class->query_visual_types = _gdk_x11_screen_query_visual_types;
screen_class->list_visuals = _gdk_x11_screen_list_visuals;
signals[WINDOW_MANAGER_CHANGED] =
g_signal_new (g_intern_static_string ("window-manager-changed"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkX11ScreenClass, window_manager_changed),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE,
0);
}
static guint32
get_netwm_cardinal_property (GdkScreen *screen,
const gchar *name)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
GdkAtom atom;
guint32 prop = 0;
Atom type;
gint format;
gulong nitems;
gulong bytes_after;
guchar *data;
atom = gdk_atom_intern_static_string (name);
if (!gdk_x11_screen_supports_net_wm_hint (screen, atom))
return 0;
XGetWindowProperty (x11_screen->xdisplay,
x11_screen->xroot_window,
gdk_x11_get_xatom_by_name_for_display (GDK_SCREEN_DISPLAY (screen), name),
0, G_MAXLONG,
False, XA_CARDINAL, &type, &format, &nitems,
&bytes_after, &data);
if (type == XA_CARDINAL)
{
prop = *(gulong *)data;
XFree (data);
}
return prop;
}
/**
* gdk_x11_screen_get_number_of_desktops:
* @screen: (type GdkX11Screen): a #GdkScreen
*
* Returns the number of workspaces for @screen when running under a
* window manager that supports multiple workspaces, as described
* in the
* [Extended Window Manager Hints](http://www.freedesktop.org/Standards/wm-spec) specification.
*
* Returns: the number of workspaces, or 0 if workspaces are not supported
*
* Since: 3.10
*/
guint32
gdk_x11_screen_get_number_of_desktops (GdkScreen *screen)
{
return get_netwm_cardinal_property (screen, "_NET_NUMBER_OF_DESKTOPS");
}
/**
* gdk_x11_screen_get_current_desktop:
* @screen: (type GdkX11Screen): a #GdkScreen
*
* Returns the current workspace for @screen when running under a
* window manager that supports multiple workspaces, as described
* in the
* [Extended Window Manager Hints](http://www.freedesktop.org/Standards/wm-spec) specification.
*
* Returns: the current workspace, or 0 if workspaces are not supported
*
* Since: 3.10
*/
guint32
gdk_x11_screen_get_current_desktop (GdkScreen *screen)
{
return get_netwm_cardinal_property (screen, "_NET_CURRENT_DESKTOP");
}
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