xbmc/windowing/X11/X11DPMSSupport.cpp

   1 /*
   2  *  Copyright (C) 2009-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #include "X11DPMSSupport.h"
  10
  11 #include "ServiceBroker.h"
  12 #include "utils/log.h"
  13 #include "windowing/X11/WinSystemX11.h"
  14
  15 #include <X11/Xlib.h>
  16 #include <X11/extensions/dpms.h>
  17
  18 using namespace KODI::WINDOWING::X11;
  19
  20 namespace
  21 {
  22 // Mapping of PowerSavingMode to X11's mode constants.
  23 const CARD16 X_DPMS_MODES[] =
  24 {
  25   DPMSModeStandby,
  26   DPMSModeSuspend,
  27   DPMSModeOff
  28 };
  29 }
  30
  31 CX11DPMSSupport::CX11DPMSSupport()
  32 {
  33   CWinSystemX11* winSystem = dynamic_cast<CWinSystemX11*>(CServiceBroker::GetWinSystem());
  34   if (!winSystem)
  35     return;
  36
  37   Display* dpy = winSystem->GetDisplay();
  38   if (!dpy)
  39     return;
  40
  41   int event_base, error_base; // we ignore these
  42   if (!DPMSQueryExtension(dpy, &event_base, &error_base))
  43   {
  44     CLog::Log(LOGINFO, "DPMS: X11 extension not present, power-saving will not be available");
  45     return;
  46   }
  47
  48   if (!DPMSCapable(dpy))
  49   {
  50     CLog::Log(LOGINFO, "DPMS: display does not support power-saving");
  51     return;
  52   }
  53
  54   m_supportedModes.push_back(SUSPEND); // best compromise
  55   m_supportedModes.push_back(OFF); // next best
  56   m_supportedModes.push_back(STANDBY); // rather lame, < 80% power according to DPMS spec
  57 }
  58
  59 bool CX11DPMSSupport::EnablePowerSaving(PowerSavingMode mode)
  60 {
  61   CWinSystemX11* winSystem = dynamic_cast<CWinSystemX11*>(CServiceBroker::GetWinSystem());
  62   if (!winSystem)
  63     return false;
  64
  65   Display* dpy = winSystem->GetDisplay();
  66   if (!dpy)
  67     return false;
  68
  69   // This is not needed on my ATI Radeon, but the docs say that DPMSForceLevel
  70   // after a DPMSDisable (from SDL) should not normally work.
  71   DPMSEnable(dpy);
  72   DPMSForceLevel(dpy, X_DPMS_MODES[mode]);
  73   // There shouldn't be any errors if we called DPMSEnable; if they do happen,
  74   // they're asynchronous and messy to detect.
  75   XFlush(dpy);
  76   return true;
  77 }
  78
  79 bool CX11DPMSSupport::DisablePowerSaving()
  80 {
  81   CWinSystemX11* winSystem = dynamic_cast<CWinSystemX11*>(CServiceBroker::GetWinSystem());
  82   if (!winSystem)
  83     return false;
  84
  85   Display* dpy = winSystem->GetDisplay();
  86   if (!dpy)
  87     return false;
  88
  89   DPMSForceLevel(dpy, DPMSModeOn);
  90   DPMSDisable(dpy);
  91   XFlush(dpy);
  92
  93   winSystem->RecreateWindow();
  94
  95   return true;
  96 }