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RetroArch/gfx/common/x11_common.c

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2017 - Daniel De Matteis
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <unistd.h>
#include <X11/Xatom.h>
#ifdef HAVE_CONFIG_H
#include "../../config.h"
#endif
#ifdef HAVE_XINERAMA
#include <X11/extensions/Xinerama.h>
#endif
#include "x11_common.h"
#include <X11/extensions/xf86vmode.h>
#include <encodings/utf.h>
#include <compat/strl.h>
#ifdef HAVE_DBUS
#include "dbus_common.h"
#endif
#include "../../frontend/frontend_driver.h"
#include "../../input/input_driver.h"
#include "../../input/input_keymaps.h"
#include "../../input/common/input_x11_common.h"
#include "../../configuration.h"
#include "../../verbosity.h"
#define _NET_WM_STATE_ADD 1
#define MOVERESIZE_GRAVITY_CENTER 5
#define MOVERESIZE_X_SHIFT 8
#define MOVERESIZE_Y_SHIFT 9
#define V_DBLSCAN 0x20
/* TODO/FIXME - globals */
bool g_x11_entered = false;
Display *g_x11_dpy = NULL;
unsigned g_x11_screen = 0;
Window g_x11_win = None;
Colormap g_x11_cmap;
/* TODO/FIXME - static globals */
static XF86VidModeModeInfo desktop_mode;
static bool xdg_screensaver_available = true;
static bool g_x11_has_focus = false;
static bool g_x11_true_full = false;
static XConfigureEvent g_x11_xce = {0};
static Atom XA_NET_WM_STATE;
static Atom XA_NET_WM_STATE_FULLSCREEN;
static Atom XA_NET_MOVERESIZE_WINDOW;
static Atom g_x11_quit_atom;
static XIM g_x11_xim;
static XIC g_x11_xic;
static enum retro_key x11_keysym_lut[RETROK_LAST];
static unsigned *x11_keysym_rlut = NULL;
static unsigned x11_keysym_rlut_size = 0;
static void x11_hide_mouse(Display *dpy, Window win)
{
Cursor no_ptr;
Pixmap bm_no;
XColor black, dummy;
static char bm_no_data[] = {0, 0, 0, 0, 0, 0, 0, 0};
Colormap colormap = DefaultColormap(dpy, DefaultScreen(dpy));
if (!XAllocNamedColor(dpy, colormap, "black", &black, &dummy))
return;
bm_no = XCreateBitmapFromData(dpy, win, bm_no_data, 8, 8);
no_ptr = XCreatePixmapCursor(dpy, bm_no, bm_no, &black, &black, 0, 0);
XDefineCursor(dpy, win, no_ptr);
XFreeCursor(dpy, no_ptr);
if (bm_no != None)
XFreePixmap(dpy, bm_no);
XFreeColors(dpy, colormap, &black.pixel, 1, 0);
}
void x11_show_mouse(Display *dpy, Window win, bool state)
{
if (state)
XUndefineCursor(dpy, win);
else
x11_hide_mouse(dpy, win);
}
void x11_set_net_wm_fullscreen(Display *dpy, Window win)
{
XEvent xev = {0};
XA_NET_WM_STATE = XInternAtom(dpy, "_NET_WM_STATE", False);
XA_NET_WM_STATE_FULLSCREEN = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
xev.xclient.type = ClientMessage;
xev.xclient.send_event = True;
xev.xclient.message_type = XA_NET_WM_STATE;
xev.xclient.window = win;
xev.xclient.format = 32;
xev.xclient.data.l[0] = _NET_WM_STATE_ADD;
xev.xclient.data.l[1] = XA_NET_WM_STATE_FULLSCREEN;
XSendEvent(dpy, DefaultRootWindow(dpy), False,
SubstructureRedirectMask | SubstructureNotifyMask,
&xev);
}
/* Try to be nice to tiling WMs if possible. */
void x11_move_window(Display *dpy, Window win, int x, int y,
unsigned width, unsigned height)
{
XEvent xev = {0};
XA_NET_MOVERESIZE_WINDOW = XInternAtom(dpy,
"_NET_MOVERESIZE_WINDOW", False);
xev.xclient.type = ClientMessage;
xev.xclient.send_event = True;
xev.xclient.message_type = XA_NET_MOVERESIZE_WINDOW;
xev.xclient.window = win;
xev.xclient.format = 32;
xev.xclient.data.l[0] = (1 << MOVERESIZE_X_SHIFT)
| (1 << MOVERESIZE_Y_SHIFT);
xev.xclient.data.l[1] = x;
xev.xclient.data.l[2] = y;
XSendEvent(dpy, DefaultRootWindow(dpy), False,
SubstructureRedirectMask | SubstructureNotifyMask,
&xev);
}
static void x11_set_window_class(Display *dpy, Window win)
{
XClassHint hint;
hint.res_name = (char*)"retroarch"; /* Broken header. */
hint.res_class = (char*)"retroarch";
XSetClassHint(dpy, win, &hint);
}
static void x11_set_window_pid(Display *dpy, Window win)
{
long scret = 0;
char *hostname = NULL;
pid_t pid = getpid();
XChangeProperty(dpy, win, XInternAtom(dpy, "_NET_WM_PID", False),
XA_CARDINAL, 32, PropModeReplace, (unsigned char *)&pid, 1);
errno = 0;
if ((scret = sysconf(_SC_HOST_NAME_MAX)) == -1 && errno)
return;
if (!(hostname = (char*)malloc(scret + 1)))
return;
if (gethostname(hostname, scret + 1) == -1)
RARCH_WARN("Failed to get hostname.\n");
else
{
XChangeProperty(dpy, win, XA_WM_CLIENT_MACHINE, XA_STRING, 8,
PropModeReplace, (unsigned char *)hostname, strlen(hostname));
}
free(hostname);
}
void x11_set_window_attr(Display *dpy, Window win)
{
x11_set_window_class(dpy, win);
x11_set_window_pid(dpy, win);
}
static void xdg_screensaver_inhibit(Window wnd)
{
int ret;
char cmd[64];
char title[128];
cmd[0] = '\0';
title[0] = '\0';
RARCH_LOG("[X11]: Suspending screensaver (X11, xdg-screensaver).\n");
if (g_x11_dpy && g_x11_win)
{
/* Make sure the window has a title, even if it's a bogus one, otherwise
* xdg-screensaver will fail and report to stderr, framing RA for its bug.
* A single space character is used so that the title bar stays visibly
* the same, as if there's no title at all. */
video_driver_get_window_title(title, sizeof(title));
if (strlen(title) == 0)
snprintf(title, sizeof(title), " ");
XChangeProperty(g_x11_dpy, g_x11_win, XA_WM_NAME, XA_STRING,
8, PropModeReplace, (const unsigned char*) title,
strlen(title));
}
snprintf(cmd, sizeof(cmd), "xdg-screensaver suspend 0x%x", (int)wnd);
ret = system(cmd);
if (ret == -1)
{
xdg_screensaver_available = false;
RARCH_WARN("Failed to launch xdg-screensaver.\n");
}
else if (WEXITSTATUS(ret))
{
xdg_screensaver_available = false;
RARCH_WARN("Could not suspend screen saver.\n");
}
}
void x11_suspend_screensaver(Window wnd, bool enable)
{
#ifdef HAVE_DBUS
if (dbus_suspend_screensaver(enable))
return;
#endif
if (enable)
if (xdg_screensaver_available)
xdg_screensaver_inhibit(wnd);
}
float x11_get_refresh_rate(void *data)
{
XWindowAttributes attr;
XF86VidModeModeLine modeline;
Screen *screen;
int screenid;
int dotclock;
float refresh;
if (!g_x11_dpy || g_x11_win == None)
return 0.0f;
if (!XGetWindowAttributes(g_x11_dpy, g_x11_win, &attr))
return 0.0f;
screen = attr.screen;
screenid = XScreenNumberOfScreen(screen);
XF86VidModeGetModeLine(g_x11_dpy, screenid, &dotclock, &modeline);
/* non-native modes like 1080p on a 4K display might use DoubleScan */
if (modeline.flags & V_DBLSCAN)
dotclock /= 2;
refresh = (float)dotclock * 1000.0f / modeline.htotal / modeline.vtotal;
return refresh;
}
static bool get_video_mode(
Display *dpy, unsigned width, unsigned height,
XF86VidModeModeInfo *mode, XF86VidModeModeInfo *x11_desktop_mode)
{
int i, num_modes = 0;
bool ret = false;
float refresh_mod = 0.0f;
float minimum_fps_diff = 0.0f;
XF86VidModeModeInfo **modes = NULL;
settings_t *settings = config_get_ptr();
unsigned black_frame_insertion = settings->uints.video_black_frame_insertion;
float video_refresh_rate = settings->floats.video_refresh_rate;
XF86VidModeGetAllModeLines(dpy, DefaultScreen(dpy), &num_modes, &modes);
if (!num_modes)
{
XFree(modes);
return false;
}
*x11_desktop_mode = *modes[0];
/* If we use black frame insertion, we fake a 60 Hz monitor
* for 120 Hz one, etc, so try to match that. */
refresh_mod = 1.0f / (black_frame_insertion + 1.0f);
for (i = 0; i < num_modes; i++)
{
float refresh, diff;
const XF86VidModeModeInfo *m = modes[i];
if (!m)
continue;
if (m->hdisplay != width)
continue;
if (m->vdisplay != height)
continue;
refresh = refresh_mod * m->dotclock * 1000.0f / (m->htotal * m->vtotal);
diff = fabsf(refresh - video_refresh_rate);
if (!ret || diff < minimum_fps_diff)
{
*mode = *m;
minimum_fps_diff = diff;
}
ret = true;
}
XFree(modes);
return ret;
}
bool x11_enter_fullscreen(
Display *dpy, unsigned width,
unsigned height)
{
XF86VidModeModeInfo mode;
if (!get_video_mode(dpy, width, height, &mode, &desktop_mode))
return false;
if (!XF86VidModeSwitchToMode(dpy, DefaultScreen(dpy), &mode))
return false;
XF86VidModeSetViewPort(dpy, DefaultScreen(dpy), 0, 0);
return true;
}
void x11_exit_fullscreen(Display *dpy)
{
XF86VidModeSwitchToMode(dpy, DefaultScreen(dpy), &desktop_mode);
XF86VidModeSetViewPort(dpy, DefaultScreen(dpy), 0, 0);
}
static void x11_init_keyboard_lut(void)
{
const struct rarch_key_map *map = rarch_key_map_x11;
const struct rarch_key_map *map_start = rarch_key_map_x11;
memset(x11_keysym_lut, 0, sizeof(x11_keysym_lut));
x11_keysym_rlut_size = 0;
for (; map->rk != RETROK_UNKNOWN; map++)
{
x11_keysym_lut[map->rk] = (enum retro_key)map->sym;
if (map->sym > x11_keysym_rlut_size)
x11_keysym_rlut_size = map->sym;
}
if (x11_keysym_rlut_size < 65536)
{
if (x11_keysym_rlut)
free(x11_keysym_rlut);
x11_keysym_rlut = (unsigned*)calloc(++x11_keysym_rlut_size, sizeof(unsigned));
for (map = map_start; map->rk != RETROK_UNKNOWN; map++)
x11_keysym_rlut[map->sym] = (enum retro_key)map->rk;
}
else
x11_keysym_rlut_size = 0;
}
bool x11_create_input_context(Display *dpy, Window win, XIM *xim, XIC *xic)
{
x11_destroy_input_context(xim, xic);
x11_init_keyboard_lut();
g_x11_has_focus = true;
*xim = XOpenIM(dpy, NULL, NULL, NULL);
if (!*xim)
{
RARCH_ERR("[X11]: Failed to open input method.\n");
return false;
}
*xic = XCreateIC(*xim, XNInputStyle,
XIMPreeditNothing | XIMStatusNothing, XNClientWindow, win, NULL);
if (!*xic)
{
RARCH_ERR("[X11]: Failed to create input context.\n");
return false;
}
XSetICFocus(*xic);
return true;
}
void x11_destroy_input_context(XIM *xim, XIC *xic)
{
if (*xic)
{
XDestroyIC(*xic);
*xic = NULL;
}
if (*xim)
{
XCloseIM(*xim);
*xim = NULL;
}
memset(x11_keysym_lut, 0, sizeof(x11_keysym_lut));
if (x11_keysym_rlut)
{
free(x11_keysym_rlut);
x11_keysym_rlut = NULL;
}
x11_keysym_rlut_size = 0;
}
bool x11_get_metrics(void *data,
enum display_metric_types type, float *value)
{
unsigned screen_no = 0;
Display *dpy = (Display*)XOpenDisplay(NULL);
int pixels_x = DisplayWidth(dpy, screen_no);
int pixels_y = DisplayHeight(dpy, screen_no);
int physical_width = DisplayWidthMM(dpy, screen_no);
int physical_height = DisplayHeightMM(dpy, screen_no);
(void)pixels_y;
XCloseDisplay(dpy);
switch (type)
{
case DISPLAY_METRIC_PIXEL_WIDTH:
*value = (float)pixels_x;
break;
case DISPLAY_METRIC_PIXEL_HEIGHT:
*value = (float)pixels_y;
break;
case DISPLAY_METRIC_MM_WIDTH:
*value = (float)physical_width;
break;
case DISPLAY_METRIC_MM_HEIGHT:
*value = (float)physical_height;
break;
case DISPLAY_METRIC_DPI:
*value = ((((float)pixels_x) * 25.4) / ((float)physical_width));
break;
case DISPLAY_METRIC_NONE:
default:
*value = 0;
return false;
}
return true;
}
static enum retro_key x11_translate_keysym_to_rk(unsigned sym)
{
size_t i;
/* Fast path */
if (x11_keysym_rlut && sym < x11_keysym_rlut_size)
return (enum retro_key)x11_keysym_rlut[sym];
/* Slow path */
for (i = 0; i < ARRAY_SIZE(x11_keysym_lut); i++)
{
if (x11_keysym_lut[i] != sym)
continue;
return (enum retro_key)i;
}
return RETROK_UNKNOWN;
}
static void x11_handle_key_event(unsigned keycode, XEvent *event, XIC ic, bool filter)
{
int i;
Status status;
uint32_t chars[32];
unsigned key = 0;
uint16_t mod = 0;
unsigned state = event->xkey.state;
bool down = event->type == KeyPress;
int num = 0;
KeySym keysym = 0;
chars[0] = '\0';
/* this code generates the localized chars using keysyms */
if (!filter)
{
if (down)
{
char keybuf[32];
keybuf[0] = '\0';
#ifdef X_HAVE_UTF8_STRING
status = 0;
/* XwcLookupString doesn't seem to work. */
num = Xutf8LookupString(ic, &event->xkey, keybuf,
ARRAY_SIZE(keybuf), &keysym, &status);
/* libc functions need UTF-8 locale to work properly,
* which makes mbrtowc a bit impractical.
*
* Use custom UTF8 -> UTF-32 conversion. */
num = utf8_conv_utf32(chars, ARRAY_SIZE(chars), keybuf, num);
#else
(void)ic;
num = XLookupString(&event->xkey, keybuf,
sizeof(keybuf), &keysym, NULL); /* ASCII only. */
for (i = 0; i < num; i++)
chars[i] = keybuf[i] & 0x7f;
#endif
}
else
keysym = XLookupKeysym(&event->xkey, (state & ShiftMask) || (state & LockMask));
}
/* We can't feed uppercase letters to the keycode translator. Seems like a bad idea
* to feed it keysyms anyway, so here is a little hack... */
if (keysym >= XK_A && keysym <= XK_Z)
keysym += XK_z - XK_Z;
/* Get the real keycode,
that correctly ignores international layouts as windows code does. */
key = x11_translate_keysym_to_rk(keycode);
if (state & ShiftMask)
mod |= RETROKMOD_SHIFT;
if (state & LockMask)
mod |= RETROKMOD_CAPSLOCK;
if (state & ControlMask)
mod |= RETROKMOD_CTRL;
if (state & Mod1Mask)
mod |= RETROKMOD_ALT;
if (state & Mod2Mask)
mod |= RETROKMOD_NUMLOCK;
if (state & Mod4Mask)
mod |= RETROKMOD_META;
input_keyboard_event(down, key, chars[0], mod, RETRO_DEVICE_KEYBOARD);
for (i = 1; i < num; i++)
input_keyboard_event(down, RETROK_UNKNOWN,
chars[i], mod, RETRO_DEVICE_KEYBOARD);
}
bool x11_alive(void *data)
{
while (XPending(g_x11_dpy))
{
XEvent event;
bool filter = false;
unsigned keycode = 0;
/* Can get events from older windows. Check this. */
XNextEvent(g_x11_dpy, &event);
/* IMPORTANT - Get keycode before XFilterEvent
because the event is localizated after the call */
keycode = event.xkey.keycode;
filter = XFilterEvent(&event, g_x11_win);
switch (event.type)
{
case ClientMessage:
if (event.xclient.window == g_x11_win &&
(Atom)event.xclient.data.l[0] == g_x11_quit_atom)
frontend_driver_set_signal_handler_state(1);
break;
case DestroyNotify:
if (event.xdestroywindow.window == g_x11_win)
frontend_driver_set_signal_handler_state(1);
break;
case MapNotify:
if (event.xmap.window == g_x11_win)
g_x11_has_focus = true;
break;
case UnmapNotify:
if (event.xunmap.window == g_x11_win)
g_x11_has_focus = false;
break;
case ConfigureNotify:
if (event.xconfigure.window == g_x11_win)
g_x11_xce = event.xconfigure;
break;
case ButtonPress:
switch (event.xbutton.button)
{
case 1: /* Left click */
#if 0
RARCH_LOG("Click occurred : [%d, %d]\n",
event.xbutton.x_root,
event.xbutton.y_root);
#endif
break;
case 2: /* Grabbed */
/* Middle click */
break;
case 3: /* Right click */
break;
case 4: /* Grabbed */
/* Scroll up */
case 5: /* Scroll down */
case 6: /* Scroll wheel left */
case 7: /* Scroll wheel right */
x_input_poll_wheel(&event.xbutton, true);
break;
}
break;
case EnterNotify:
g_x11_entered = true;
break;
case LeaveNotify:
g_x11_entered = false;
break;
case ButtonRelease:
break;
case KeyRelease:
/* When you receive a key release and the next event is a key press
of the same key combination, then it's auto-repeat and the
key wasn't actually released. */
if(XEventsQueued(g_x11_dpy, QueuedAfterReading))
{
XEvent next_event;
XPeekEvent(g_x11_dpy, &next_event);
if (next_event.type == KeyPress &&
next_event.xkey.time == event.xkey.time &&
next_event.xkey.keycode == event.xkey.keycode)
{
break; /* Key wasn't actually released */
}
}
case KeyPress:
if (event.xkey.window == g_x11_win)
x11_handle_key_event(keycode, &event, g_x11_xic, filter);
break;
}
}
return !((bool)frontend_driver_get_signal_handler_state());
}
void x11_check_window(void *data, bool *quit,
bool *resize, unsigned *width, unsigned *height)
{
unsigned new_width = *width;
unsigned new_height = *height;
x11_get_video_size(data, &new_width, &new_height);
if (new_width != *width || new_height != *height)
{
*width = new_width;
*height = new_height;
*resize = true;
}
x11_alive(data);
*quit = (bool)frontend_driver_get_signal_handler_state();
}
void x11_get_video_size(void *data, unsigned *width, unsigned *height)
{
if (!g_x11_dpy || g_x11_win == None)
{
Display *dpy = (Display*)XOpenDisplay(NULL);
*width = 0;
*height = 0;
if (dpy)
{
int screen = DefaultScreen(dpy);
*width = DisplayWidth(dpy, screen);
*height = DisplayHeight(dpy, screen);
XCloseDisplay(dpy);
}
}
else
{
if (g_x11_xce.width != 0 && g_x11_xce.height != 0)
{
*width = g_x11_xce.width;
*height = g_x11_xce.height;
}
else
{
XWindowAttributes target;
XGetWindowAttributes(g_x11_dpy, g_x11_win, &target);
*width = target.width;
*height = target.height;
}
}
}
bool x11_has_focus_internal(void *data)
{
return g_x11_has_focus;
}
bool x11_has_focus(void *data)
{
Window win;
int rev;
XGetInputFocus(g_x11_dpy, &win, &rev);
return (win == g_x11_win && g_x11_has_focus) || g_x11_true_full;
}
bool x11_connect(void)
{
frontend_driver_destroy_signal_handler_state();
/* Keep one g_x11_dpy alive the entire process lifetime.
* This is necessary for nVidia's EGL implementation for now. */
if (!g_x11_dpy)
{
g_x11_dpy = XOpenDisplay(NULL);
if (!g_x11_dpy)
return false;
}
#ifdef HAVE_DBUS
dbus_ensure_connection();
#endif
memset(&g_x11_xce, 0, sizeof(XConfigureEvent));
return true;
}
void x11_update_title(void *data)
{
char title[128];
title[0] = '\0';
video_driver_get_window_title(title, sizeof(title));
if (title[0])
XChangeProperty(g_x11_dpy, g_x11_win, XA_WM_NAME, XA_STRING,
8, PropModeReplace, (const unsigned char*)title,
strlen(title));
}
bool x11_input_ctx_new(bool true_full)
{
if (!x11_create_input_context(g_x11_dpy, g_x11_win,
&g_x11_xim, &g_x11_xic))
return false;
video_driver_display_type_set(RARCH_DISPLAY_X11);
video_driver_display_set((uintptr_t)g_x11_dpy);
video_driver_window_set((uintptr_t)g_x11_win);
g_x11_true_full = true_full;
return true;
}
void x11_input_ctx_destroy(void)
{
x11_destroy_input_context(&g_x11_xim, &g_x11_xic);
}
void x11_window_destroy(bool fullscreen)
{
if (g_x11_win)
XUnmapWindow(g_x11_dpy, g_x11_win);
if (!fullscreen)
XDestroyWindow(g_x11_dpy, g_x11_win);
g_x11_win = None;
#ifdef HAVE_DBUS
dbus_screensaver_uninhibit();
dbus_close_connection();
#endif
}
void x11_colormap_destroy(void)
{
if (!g_x11_cmap)
return;
XFreeColormap(g_x11_dpy, g_x11_cmap);
g_x11_cmap = None;
}
void x11_install_quit_atom(void)
{
g_x11_quit_atom = XInternAtom(g_x11_dpy,
"WM_DELETE_WINDOW", False);
if (g_x11_quit_atom)
XSetWMProtocols(g_x11_dpy, g_x11_win, &g_x11_quit_atom, 1);
}
static Bool x11_wait_notify(Display *d, XEvent *e, char *arg)
{
return e->type == MapNotify && e->xmap.window == g_x11_win;
}
void x11_event_queue_check(XEvent *event)
{
XIfEvent(g_x11_dpy, event, x11_wait_notify, NULL);
}
static bool x11_check_atom_supported(Display *dpy, Atom atom)
{
Atom XA_NET_SUPPORTED = XInternAtom(dpy, "_NET_SUPPORTED", True);
Atom type;
int format;
unsigned long nitems;
unsigned long bytes_after;
Atom *prop;
int i;
if (XA_NET_SUPPORTED == None)
return false;
XGetWindowProperty(dpy, DefaultRootWindow(dpy), XA_NET_SUPPORTED,
0, UINT_MAX, False, XA_ATOM, &type, &format,&nitems,
&bytes_after, (unsigned char **) &prop);
if (!prop || type != XA_ATOM)
return false;
for (i = 0; i < nitems; i++)
{
if (prop[i] == atom)
{
XFree(prop);
return true;
}
}
XFree(prop);
return false;
}
bool x11_has_net_wm_fullscreen(Display *dpy)
{
XA_NET_WM_STATE_FULLSCREEN = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
return x11_check_atom_supported(dpy, XA_NET_WM_STATE_FULLSCREEN);
}
char *x11_get_wm_name(Display *dpy)
{
Atom type;
int format;
Window window;
Atom XA_NET_SUPPORTING_WM_CHECK = XInternAtom(g_x11_dpy, "_NET_SUPPORTING_WM_CHECK", False);
Atom XA_NET_WM_NAME = XInternAtom(g_x11_dpy, "_NET_WM_NAME", False);
Atom XA_UTF8_STRING = XInternAtom(g_x11_dpy, "UTF8_STRING", False);
unsigned long nitems = 0;
unsigned long bytes_after = 0;
char *title = NULL;
unsigned char *propdata = NULL;
if (!XA_NET_SUPPORTING_WM_CHECK || !XA_NET_WM_NAME)
return NULL;
if (!(XGetWindowProperty(dpy,
DefaultRootWindow(dpy),
XA_NET_SUPPORTING_WM_CHECK,
0,
1,
False,
XA_WINDOW,
&type,
&format,
&nitems,
&bytes_after,
&propdata) == Success &&
propdata))
return NULL;
window = ((Window *) propdata)[0];
XFree(propdata);
if (!(XGetWindowProperty(dpy,
window,
XA_NET_WM_NAME,
0,
8192,
False,
XA_UTF8_STRING,
&type,
&format,
&nitems,
&bytes_after,
&propdata) == Success
&& propdata))
return NULL;
title = strdup((char *) propdata);
XFree(propdata);
return title;
}
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