widget/qt/nsIdleServiceQt.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* vim:expandtab:shiftwidth=4:tabstop=4:
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #ifdef MOZ_X11
   9 #include "mozilla/X11Util.h"
  10 #endif
  11 #include "nsIdleServiceQt.h"
  12 #include "nsIServiceManager.h"
  13 #include "nsDebug.h"
  14 #include "prlink.h"
  15
  16 #if defined(MOZ_X11)
  17 typedef bool (*_XScreenSaverQueryExtension_fn)(Display* dpy, int* event_base,
  18                                                  int* error_base);
  19
  20 typedef XScreenSaverInfo* (*_XScreenSaverAllocInfo_fn)(void);
  21
  22 typedef void (*_XScreenSaverQueryInfo_fn)(Display* dpy, Drawable drw,
  23                                           XScreenSaverInfo *info);
  24
  25 static _XScreenSaverQueryExtension_fn _XSSQueryExtension = nullptr;
  26 static _XScreenSaverAllocInfo_fn _XSSAllocInfo = nullptr;
  27 static _XScreenSaverQueryInfo_fn _XSSQueryInfo = nullptr;
  28 #endif
  29
  30 static bool sInitialized = false;
  31
  32 NS_IMPL_ISUPPORTS_INHERITED0(nsIdleServiceQt, nsIdleService)
  33
  34 nsIdleServiceQt::nsIdleServiceQt()
  35 #if defined(MOZ_X11)
  36     : mXssInfo(nullptr)
  37 #endif
  38 {
  39 }
  40
  41 static void Initialize()
  42 {
  43     sInitialized = true;
  44
  45 #if defined(MOZ_X11)
  46     // This will leak - See comments in ~nsIdleServiceQt().
  47     PRLibrary* xsslib = PR_LoadLibrary("libXss.so.1");
  48     if (!xsslib) {
  49         return;
  50     }
  51
  52     _XSSQueryExtension = (_XScreenSaverQueryExtension_fn)
  53         PR_FindFunctionSymbol(xsslib, "XScreenSaverQueryExtension");
  54     _XSSAllocInfo = (_XScreenSaverAllocInfo_fn)
  55         PR_FindFunctionSymbol(xsslib, "XScreenSaverAllocInfo");
  56     _XSSQueryInfo = (_XScreenSaverQueryInfo_fn)
  57         PR_FindFunctionSymbol(xsslib, "XScreenSaverQueryInfo");
  58 #endif
  59 }
  60
  61 nsIdleServiceQt::~nsIdleServiceQt()
  62 {
  63 #if defined(MOZ_X11)
  64     if (mXssInfo)
  65         XFree(mXssInfo);
  66
  67 // It is not safe to unload libXScrnSaver until each display is closed because
  68 // the library registers callbacks through XESetCloseDisplay (Bug 397607).
  69 // (Also the library and its functions are scoped for the file not the object.)
  70 #if 0
  71     if (xsslib) {
  72         PR_UnloadLibrary(xsslib);
  73         xsslib = nullptr;
  74     }
  75 #endif
  76 #endif
  77 }
  78
  79 bool
  80 nsIdleServiceQt::PollIdleTime(uint32_t *aIdleTime)
  81 {
  82 #if defined(MOZ_X11)
  83     // Ask xscreensaver about idle time:
  84     *aIdleTime = 0;
  85
  86     // We might not have a display (cf. in xpcshell)
  87     Display *dplay = mozilla::DefaultXDisplay();
  88     if (!dplay) {
  89         return false;
  90     }
  91
  92     if (!sInitialized) {
  93         Initialize();
  94     }
  95     if (!_XSSQueryExtension || !_XSSAllocInfo || !_XSSQueryInfo) {
  96         return false;
  97     }
  98
  99     int event_base, error_base;
 100     if (_XSSQueryExtension(dplay, &event_base, &error_base)) {
 101         if (!mXssInfo)
 102             mXssInfo = _XSSAllocInfo();
 103         if (!mXssInfo)
 104             return false;
 105
 106         _XSSQueryInfo(dplay, RootWindowOfScreen(DefaultScreenOfDisplay(mozilla::DefaultXDisplay())), mXssInfo);
 107         *aIdleTime = mXssInfo->idle;
 108         return true;
 109     }
 110 #endif
 111
 112     return false;
 113 }
 114
 115 bool
 116 nsIdleServiceQt::UsePollMode()
 117 {
 118 #if defined(MOZ_X11)
 119     return false;
 120 #endif
 121     return true;
 122 }
 123