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gtk/gdk/x11/gdkscreen-x11.c
William Jon McCann 469d333aa2 docs: use Returns: consistently 
Instead of Return value:
2014-02-19 18:56:05 -05:00

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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 <glib.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xatom.h>
#ifdef HAVE_SOLARIS_XINERAMA
#include <X11/extensions/xinerama.h>
#endif
#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);
static void deinit_multihead (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;
};
struct _GdkX11Monitor
{
GdkRectangle geometry;
XID output;
int width_mm;
int height_mm;
char * output_name;
char * manufacturer;
};
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);
deinit_multihead (GDK_SCREEN (object));
G_OBJECT_CLASS (gdk_x11_screen_parent_class)->finalize (object);
}
static gint
gdk_x11_screen_get_n_monitors (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->n_monitors;
}
static gint
gdk_x11_screen_get_primary_monitor (GdkScreen *screen)
{
return GDK_X11_SCREEN (screen)->primary_monitor;
}
static gint
gdk_x11_screen_get_monitor_width_mm (GdkScreen *screen,
gint monitor_num)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
return x11_screen->monitors[monitor_num].width_mm;
}
static gint
gdk_x11_screen_get_monitor_height_mm (GdkScreen *screen,
gint monitor_num)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
return x11_screen->monitors[monitor_num].height_mm;
}
static gchar *
gdk_x11_screen_get_monitor_plug_name (GdkScreen *screen,
gint monitor_num)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
return g_strdup (x11_screen->monitors[monitor_num].output_name);
}
/**
* 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);
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_screen->n_monitors, None);
return x11_screen->monitors[monitor_num].output;
}
static void
gdk_x11_screen_get_monitor_geometry (GdkScreen *screen,
gint monitor_num,
GdkRectangle *dest)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
if (dest)
{
*dest = x11_screen->monitors[monitor_num].geometry;
dest->x /= x11_screen->window_scale;
dest->y /= x11_screen->window_scale;
dest->width /= x11_screen->window_scale;
dest->height /= x11_screen->window_scale;
}
}
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;
}
static void
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) / x11_screen->window_scale;
area->height = gdk_screen_get_height (screen) / x11_screen->window_scale;
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 void
gdk_x11_screen_get_monitor_workarea (GdkScreen *screen,
gint monitor_num,
GdkRectangle *dest)
{
GdkRectangle workarea;
gdk_x11_screen_get_monitor_geometry (screen, monitor_num, dest);
/* The EWMH constrains workarea to be a rectangle, so it
* can't adequately deal with L-shaped monitor arrangements.
* As a workaround, we ignore the workarea for anything
* but the primary monitor. Since that is where the 'desktop
* chrome' usually lives, this works ok in practice.
*/
if (monitor_num == GDK_X11_SCREEN (screen)->primary_monitor)
{
get_work_area (screen, &workarea);
if (gdk_rectangle_intersect (dest, &workarea, &workarea))
*dest = workarea;
}
}
static gint
gdk_x11_screen_get_monitor_scale_factor (GdkScreen *screen,
gint monitor_num)
{
GdkX11Screen *screen_x11 = GDK_X11_SCREEN (screen);
return screen_x11->window_scale;
}
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 void
init_monitor_geometry (GdkX11Monitor *monitor,
int x, int y, int width, int height)
{
monitor->geometry.x = x;
monitor->geometry.y = y;
monitor->geometry.width = width;
monitor->geometry.height = height;
monitor->output = None;
monitor->width_mm = -1;
monitor->height_mm = -1;
monitor->output_name = NULL;
monitor->manufacturer = NULL;
}
static gboolean
init_fake_xinerama (GdkScreen *screen)
{
#ifdef G_ENABLE_DEBUG
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
XSetWindowAttributes atts;
Window win;
gint w, h;
if (!(_gdk_debug_flags & GDK_DEBUG_XINERAMA))
return FALSE;
/* Fake Xinerama mode by splitting the screen into 4 monitors.
* Also draw a little cross to make the monitor boundaries visible.
*/
w = WidthOfScreen (x11_screen->xscreen);
h = HeightOfScreen (x11_screen->xscreen);
x11_screen->n_monitors = 4;
x11_screen->monitors = g_new0 (GdkX11Monitor, 4);
init_monitor_geometry (&x11_screen->monitors[0], 0, 0, w / 2, h / 2);
init_monitor_geometry (&x11_screen->monitors[1], w / 2, 0, w / 2, h / 2);
init_monitor_geometry (&x11_screen->monitors[2], 0, h / 2, w / 2, h / 2);
init_monitor_geometry (&x11_screen->monitors[3], w / 2, h / 2, w / 2, h / 2);
atts.override_redirect = 1;
atts.background_pixel = WhitePixel(GDK_SCREEN_XDISPLAY (screen),
x11_screen->screen_num);
win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
x11_screen->xroot_window, 0, h / 2, w, 1, 0,
DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
x11_screen->screen_num),
InputOutput,
DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
x11_screen->screen_num),
CWOverrideRedirect|CWBackPixel,
&atts);
XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
win = XCreateWindow(GDK_SCREEN_XDISPLAY (screen),
x11_screen->xroot_window, w/2 , 0, 1, h, 0,
DefaultDepth(GDK_SCREEN_XDISPLAY (screen),
x11_screen->screen_num),
InputOutput,
DefaultVisual(GDK_SCREEN_XDISPLAY (screen),
x11_screen->screen_num),
CWOverrideRedirect|CWBackPixel,
&atts);
XMapRaised(GDK_SCREEN_XDISPLAY (screen), win);
return TRUE;
#endif
return FALSE;
}
static void
free_monitors (GdkX11Monitor *monitors,
gint n_monitors)
{
int i;
for (i = 0; i < n_monitors; ++i)
{
g_free (monitors[i].output_name);
g_free (monitors[i].manufacturer);
}
g_free (monitors);
}
#ifdef HAVE_RANDR
static int
monitor_compare_function (GdkX11Monitor *monitor1,
GdkX11Monitor *monitor2)
{
/* Sort the leftmost/topmost monitors first.
* For "cloned" monitors, sort the bigger ones first
* (giving preference to taller monitors over wider
* monitors)
*/
if (monitor1->geometry.x != monitor2->geometry.x)
return monitor1->geometry.x - monitor2->geometry.x;
if (monitor1->geometry.y != monitor2->geometry.y)
return monitor1->geometry.y - monitor2->geometry.y;
if (monitor1->geometry.height != monitor2->geometry.height)
return - (monitor1->geometry.height - monitor2->geometry.height);
if (monitor1->geometry.width != monitor2->geometry.width)
return - (monitor1->geometry.width - monitor2->geometry.width);
return 0;
}
#endif
static gboolean
init_randr13 (GdkScreen *screen)
{
#ifdef HAVE_RANDR
GdkDisplay *display = gdk_screen_get_display (screen);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
Display *dpy = GDK_SCREEN_XDISPLAY (screen);
XRRScreenResources *resources;
RROutput primary_output;
RROutput first_output = None;
int i;
GArray *monitors;
gboolean randr12_compat = FALSE;
if (!display_x11->have_randr13)
return FALSE;
resources = XRRGetScreenResourcesCurrent (x11_screen->xdisplay,
x11_screen->xroot_window);
if (!resources)
return FALSE;
monitors = g_array_sized_new (FALSE, TRUE, sizeof (GdkX11Monitor),
resources->noutput);
for (i = 0; i < resources->noutput; ++i)
{
XRROutputInfo *output =
XRRGetOutputInfo (dpy, resources, resources->outputs[i]);
/* Non RandR1.2 X driver have output name "default" */
randr12_compat |= !g_strcmp0 (output->name, "default");
if (output->connection == RR_Disconnected)
{
XRRFreeOutputInfo (output);
continue;
}
if (output->crtc)
{
GdkX11Monitor monitor;
XRRCrtcInfo *crtc = XRRGetCrtcInfo (dpy, resources, output->crtc);
monitor.geometry.x = crtc->x;
monitor.geometry.y = crtc->y;
monitor.geometry.width = crtc->width;
monitor.geometry.height = crtc->height;
monitor.output = resources->outputs[i];
monitor.width_mm = output->mm_width;
monitor.height_mm = output->mm_height;
monitor.output_name = g_strdup (output->name);
/* FIXME: need EDID parser */
monitor.manufacturer = NULL;
g_array_append_val (monitors, monitor);
XRRFreeCrtcInfo (crtc);
}
XRRFreeOutputInfo (output);
}
if (resources->noutput > 0)
first_output = resources->outputs[0];
XRRFreeScreenResources (resources);
/* non RandR 1.2 X driver doesn't return any usable multihead data */
if (randr12_compat)
{
guint n_monitors = monitors->len;
free_monitors ((GdkX11Monitor *)g_array_free (monitors, FALSE),
n_monitors);
return FALSE;
}
g_array_sort (monitors,
(GCompareFunc) monitor_compare_function);
x11_screen->n_monitors = monitors->len;
x11_screen->monitors = (GdkX11Monitor *)g_array_free (monitors, FALSE);
x11_screen->primary_monitor = 0;
primary_output = XRRGetOutputPrimary (x11_screen->xdisplay,
x11_screen->xroot_window);
for (i = 0; i < x11_screen->n_monitors; ++i)
{
if (x11_screen->monitors[i].output == primary_output)
{
x11_screen->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 (x11_screen->monitors[i].output_name, "LVDS", 4) == 0)
{
x11_screen->primary_monitor = i;
break;
}
/* No primary specified and no LVDS found */
if (x11_screen->monitors[i].output == first_output)
x11_screen->primary_monitor = i;
}
return x11_screen->n_monitors > 0;
#endif
return FALSE;
}
static gboolean
init_solaris_xinerama (GdkScreen *screen)
{
#ifdef HAVE_SOLARIS_XINERAMA
Display *dpy = GDK_SCREEN_XDISPLAY (screen);
int screen_no = gdk_screen_get_number (screen);
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
XRectangle monitors[MAXFRAMEBUFFERS];
unsigned char hints[16];
gint result;
int n_monitors;
int i;
if (!XineramaGetState (dpy, screen_no))
return FALSE;
result = XineramaGetInfo (dpy, screen_no, monitors, hints, &n_monitors);
/* Yes I know it should be Success but the current implementation
* returns the num of monitor
*/
if (result == 0)
{
return FALSE;
}
x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
x11_screen->n_monitors = n_monitors;
for (i = 0; i < n_monitors; i++)
{
init_monitor_geometry (&x11_screen->monitors[i],
monitors[i].x, monitors[i].y,
monitors[i].width, monitors[i].height);
}
x11_screen->primary_monitor = 0;
return TRUE;
#endif /* HAVE_SOLARIS_XINERAMA */
return FALSE;
}
static gboolean
init_xfree_xinerama (GdkScreen *screen)
{
#ifdef HAVE_XFREE_XINERAMA
Display *dpy = GDK_SCREEN_XDISPLAY (screen);
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
XineramaScreenInfo *monitors;
int i, n_monitors;
if (!XineramaIsActive (dpy))
return FALSE;
monitors = XineramaQueryScreens (dpy, &n_monitors);
if (n_monitors <= 0 || monitors == NULL)
{
/* If Xinerama doesn't think we have any monitors, try acting as
* though we had no Xinerama. If the "no monitors" condition
* is because XRandR 1.2 is currently switching between CRTCs,
* we'll be notified again when we have our monitor back,
* and can go back into Xinerama-ish mode at that point.
*/
if (monitors)
XFree (monitors);
return FALSE;
}
x11_screen->n_monitors = n_monitors;
x11_screen->monitors = g_new0 (GdkX11Monitor, n_monitors);
for (i = 0; i < n_monitors; ++i)
{
init_monitor_geometry (&x11_screen->monitors[i],
monitors[i].x_org, monitors[i].y_org,
monitors[i].width, monitors[i].height);
}
XFree (monitors);
x11_screen->primary_monitor = 0;
return TRUE;
#endif /* HAVE_XFREE_XINERAMA */
return FALSE;
}
static gboolean
init_solaris_xinerama_indices (GdkX11Screen *x11_screen)
{
#ifdef HAVE_SOLARIS_XINERAMA
XRectangle x_monitors[MAXFRAMEBUFFERS];
unsigned char hints[16];
gint result;
gint monitor_num;
gint x_n_monitors;
gint i;
if (!XineramaGetState (x11_screen->xdisplay, x11_screen->screen_num))
return FALSE;
result = XineramaGetInfo (x11_screen->xdisplay, x11_screen->screen_num,
x_monitors, hints, &x_n_monitors);
if (result == 0)
return FALSE;
for (monitor_num = 0; monitor_num < x11_screen->n_monitors; ++monitor_num)
{
for (i = 0; i < x_n_monitors; ++i)
{
if (x11_screen->monitors[monitor_num].geometry.x == x_monitors[i].x &&
x11_screen->monitors[monitor_num].geometry.y == x_monitors[i].y &&
x11_screen->monitors[monitor_num].geometry.width == x_monitors[i].width &&
x11_screen->monitors[monitor_num].geometry.height == x_monitors[i].height)
{
g_hash_table_insert (x11_screen->xinerama_matches,
GINT_TO_POINTER (monitor_num),
GINT_TO_POINTER (i));
}
}
}
return TRUE;
#endif /* HAVE_SOLARIS_XINERAMA */
return FALSE;
}
static gboolean
init_xfree_xinerama_indices (GdkX11Screen *x11_screen)
{
#ifdef HAVE_XFREE_XINERAMA
XineramaScreenInfo *x_monitors;
gint monitor_num;
gint x_n_monitors;
gint i;
if (!XineramaIsActive (x11_screen->xdisplay))
return FALSE;
x_monitors = XineramaQueryScreens (x11_screen->xdisplay, &x_n_monitors);
if (x_n_monitors <= 0 || x_monitors == NULL)
{
if (x_monitors)
XFree (x_monitors);
return FALSE;
}
for (monitor_num = 0; monitor_num < x11_screen->n_monitors; ++monitor_num)
{
for (i = 0; i < x_n_monitors; ++i)
{
if (x11_screen->monitors[monitor_num].geometry.x == x_monitors[i].x_org &&
x11_screen->monitors[monitor_num].geometry.y == x_monitors[i].y_org &&
x11_screen->monitors[monitor_num].geometry.width == x_monitors[i].width &&
x11_screen->monitors[monitor_num].geometry.height == x_monitors[i].height)
{
g_hash_table_insert (x11_screen->xinerama_matches,
GINT_TO_POINTER (monitor_num),
GINT_TO_POINTER (i));
}
}
}
XFree (x_monitors);
return TRUE;
#endif /* HAVE_XFREE_XINERAMA */
return FALSE;
}
static void
init_xinerama_indices (GdkX11Screen *x11_screen)
{
int opcode, firstevent, firsterror;
x11_screen->xinerama_matches = g_hash_table_new (g_direct_hash, g_direct_equal);
if (XQueryExtension (x11_screen->xdisplay, "XINERAMA",
&opcode, &firstevent, &firsterror))
{
x11_screen->xinerama_matches = g_hash_table_new (g_direct_hash, g_direct_equal);
/* Solaris Xinerama first, then XFree/Xorg Xinerama
* to match the order in init_multihead()
*/
if (init_solaris_xinerama_indices (x11_screen) == FALSE)
init_xfree_xinerama_indices (x11_screen);
}
}
gint
_gdk_x11_screen_get_xinerama_index (GdkScreen *screen,
gint monitor_num)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
gpointer val;
g_return_val_if_fail (monitor_num < x11_screen->n_monitors, -1);
if (x11_screen->xinerama_matches == NULL)
init_xinerama_indices (x11_screen);
if (g_hash_table_lookup_extended (x11_screen->xinerama_matches, GINT_TO_POINTER (monitor_num), NULL, &val))
return (GPOINTER_TO_INT(val));
return -1;
}
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 monitor_num;
for (monitor_num = 0; monitor_num < x11_screen->n_monitors; monitor_num++)
{
gint monitor_x = x11_screen->monitors[monitor_num].geometry.x;
gint monitor_y = x11_screen->monitors[monitor_num].geometry.y;
gint monitor_max_x = monitor_x + x11_screen->monitors[monitor_num].geometry.width;
gint monitor_max_y = monitor_y + x11_screen->monitors[monitor_num].geometry.height;
if (left && left_most_pos > monitor_x)
{
left_most_pos = monitor_x;
*left = monitor_num;
}
if (right && right_most_pos < monitor_max_x)
{
right_most_pos = monitor_max_x;
*right = monitor_num;
}
if (top && top_most_pos > monitor_y)
{
top_most_pos = monitor_y;
*top = monitor_num;
}
if (bottom && bottom_most_pos < monitor_max_y)
{
bottom_most_pos = monitor_max_y;
*bottom = monitor_num;
}
}
}
static void
deinit_multihead (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
free_monitors (x11_screen->monitors, x11_screen->n_monitors);
g_clear_pointer (&x11_screen->xinerama_matches, g_hash_table_destroy);
x11_screen->n_monitors = 0;
x11_screen->monitors = NULL;
}
static gboolean
compare_monitor (GdkX11Monitor *m1,
GdkX11Monitor *m2)
{
if (m1->geometry.x != m2->geometry.x ||
m1->geometry.y != m2->geometry.y ||
m1->geometry.width != m2->geometry.width ||
m1->geometry.height != m2->geometry.height)
return FALSE;
if (m1->width_mm != m2->width_mm ||
m1->height_mm != m2->height_mm)
return FALSE;
if (g_strcmp0 (m1->output_name, m2->output_name) != 0)
return FALSE;
if (g_strcmp0 (m1->manufacturer, m2->manufacturer) != 0)
return FALSE;
return TRUE;
}
static gboolean
compare_monitors (GdkX11Monitor *monitors1, gint n_monitors1,
GdkX11Monitor *monitors2, gint n_monitors2)
{
gint i;
if (n_monitors1 != n_monitors2)
return FALSE;
for (i = 0; i < n_monitors1; i++)
{
if (!compare_monitor (monitors1 + i, monitors2 + i))
return FALSE;
}
return TRUE;
}
static void
init_multihead (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
int opcode, firstevent, firsterror;
/* There are four different implementations of multihead support:
*
* 1. Fake Xinerama for debugging purposes
* 2. RandR 1.2
* 3. Solaris Xinerama
* 4. XFree86/Xorg Xinerama
*
* We use them in that order.
*/
if (init_fake_xinerama (screen))
return;
if (init_randr13 (screen))
return;
if (XQueryExtension (GDK_SCREEN_XDISPLAY (screen), "XINERAMA",
&opcode, &firstevent, &firsterror))
{
if (init_solaris_xinerama (screen))
return;
if (init_xfree_xinerama (screen))
return;
}
/* No multihead support of any kind for this screen */
x11_screen->n_monitors = 1;
x11_screen->monitors = g_new0 (GdkX11Monitor, 1);
x11_screen->primary_monitor = 0;
init_monitor_geometry (x11_screen->monitors, 0, 0,
WidthOfScreen (x11_screen->xscreen),
HeightOfScreen (x11_screen->xscreen));
}
static void
update_bounding_box (GdkScreen *screen)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
gint i, x1, y1, x2, y2;
x1 = y1 = G_MAXINT;
x2 = y2 = G_MININT;
for (i = 0; i < x11_screen->n_monitors; i++)
{
GdkX11Monitor *monitor;
monitor = &x11_screen->monitors[i];
x1 = MIN (x1, monitor->geometry.x);
y1 = MIN (y1, monitor->geometry.y);
x2 = MAX (x2, monitor->geometry.x + monitor->geometry.width);
y2 = MAX (y2, monitor->geometry.y + monitor->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");
#ifdef HAVE_CAIRO_SURFACE_SET_DEVICE_SCALE
scale_str = g_getenv ("GDK_SCALE");
#else
scale_str = "1";
#endif
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_multihead (screen);
init_randr_support (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,
int scale)
{
GList *toplevels, *l;
GdkWindow *root;
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);
}
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)
{
GdkX11Screen *x11_screen = GDK_X11_SCREEN (screen);
gint n_monitors;
gint primary_monitor;
GdkX11Monitor *monitors;
gboolean changed;
primary_monitor = x11_screen->primary_monitor;
n_monitors = x11_screen->n_monitors;
monitors = x11_screen->monitors;
x11_screen->n_monitors = 0;
x11_screen->monitors = NULL;
init_multihead (screen);
changed =
!compare_monitors (monitors, n_monitors,
x11_screen->monitors, x11_screen->n_monitors) ||
x11_screen->primary_monitor != primary_monitor;
free_monitors (monitors, n_monitors);
if (changed)
{
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_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_type_transformable (G_VALUE_TYPE (setting), G_VALUE_TYPE (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;
}
g_value_transform (setting, value);
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_n_monitors = gdk_x11_screen_get_n_monitors;
screen_class->get_primary_monitor = gdk_x11_screen_get_primary_monitor;
screen_class->get_monitor_width_mm = gdk_x11_screen_get_monitor_width_mm;
screen_class->get_monitor_height_mm = gdk_x11_screen_get_monitor_height_mm;
screen_class->get_monitor_plug_name = gdk_x11_screen_get_monitor_plug_name;
screen_class->get_monitor_geometry = gdk_x11_screen_get_monitor_geometry;
screen_class->get_monitor_workarea = gdk_x11_screen_get_monitor_workarea;
screen_class->get_monitor_scale_factor = gdk_x11_screen_get_monitor_scale_factor;
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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