screensaver.cpp

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#include "screensaver.h"

#include <QX11Info>
#include <QStringList>
#include <QProcess>
#include <QTimer>
#include <X11/Xlib.h>

#ifdef X11_Xscreensaver_FOUND
#  include <X11/extensions/scrnsaver.h>
#endif
#ifdef X11_dpms_FOUND
#include <X11/extensions/dpms.h>
#endif

namespace {

   Display *display = nullptr;
   bool extensionSupported = false;
   bool dpmsSupported = false;
   QTimer *timer = nullptr;

   bool init()
   {
      if (display != nullptr) {
         return true;
      }
      display = QX11Info::display();
      if (display == nullptr) {
         return false;
      }
#ifdef X11_Xscreensaver_FOUND
      int dummy;
      extensionSupported = (XScreenSaverQueryExtension(display, &dummy, &dummy) == True);
#endif
#ifdef X11_dpms_FOUND
      dpmsSupported = (DPMSCapable(display) == True);
#endif
      return true;
   }

}

namespace ScreenSaver {

   void allowSaverAndStandby(bool allow)
   {
      if (!init())
         return;
#ifdef X11_Xscreensaver_FOUND
      if (extensionSupported) {
         XScreenSaverSuspend(display, allow ? False : True);
         return;
      }
#endif
      if (allow) {
         if (timer != nullptr) {
            timer->stop();
         }
      } else {
         if (timer == nullptr) {
            timer = new QTimer;
            QObject::connect(timer, &QTimer::timeout, forceUnlockAndScreenOn);
         }
         timer->setSingleShot(false);
         timer->start(55000);
      }
   }

   void forceUnlockAndScreenOn()
   {
      if (!init())
         return;
      QProcess::startDetached("xscreensaver-command", QStringList() << "-deactivate");
#ifdef X11_dpms_FOUND
      CARD16 power_level;
      BOOL state;
      if (DPMSInfo(display, &power_level, &state) && state) {
         DPMSForceLevel(display, DPMSModeOn);
         return;
      }
#endif
   }

}