x11: actually disable screensaver

We already use 2 screensaver APIs when attempting to disable the
screensaver: XResetScreenSaver() (from xlib) and XScreenSaverSuspend
(from the X11 Screen Saver extension). None of these actually work.

On modern desktop Linux, we are expected to make dbus calls using some
freedesktop-defined protocol (and possibly we'd have to fallback to a
Gnome specific one). At least xscreensaver doesn't respect the "old"
APIs either.

Solve this by running the xdg-screensaver script. It's a terrible, ugly
piece of shit (just read the script if you disagree), but at least it
appears to work everywhere. It's also simpler than involving various
dbus client libraries.

I hope this can replace the --heartbeat-cmd option, and maybe we could
remove our own DPMS/XSS code too.

1 files changed, 6 insertions, 0 deletions

diff --git a/video/out/x11_common.h b/video/out/x11_common.h
index f6d73dae00..eeff773bef 100644
--- a/video/out/x11_common.h
+++ b/video/out/x11_common.h
@@ -20,9 +20,12 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include <pthread.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 
+#include "osdep/semaphore.h"
+
 #include "common/common.h"
 
 struct vo;
@@ -57,6 +60,9 @@ struct vo_x11_state {
     bool screensaver_enabled;
     bool dpms_touched;
     double screensaver_time_last;
+    pthread_t screensaver_thread;
+    sem_t screensaver_sem;
+    struct mp_cancel *screensaver_terminate;
 
     XIM xim;
     XIC xic;