1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/x/x11_screensaver.h"
#include <memory>
#include "base/command_line.h"
#include "base/no_destructor.h"
#include "base/notreached.h"
#include "ui/base/x/x11_util.h"
#include "ui/gfx/switches.h"
#include "ui/gfx/x/atom_cache.h"
#include "ui/gfx/x/connection.h"
#include "ui/gfx/x/event.h"
#include "ui/gfx/x/property_cache.h"
#include "ui/gfx/x/screensaver.h"
namespace ui {
namespace {
bool IsMitScreensaverActive(x11::ScreenSaver::State state) {
switch (state) {
case x11::ScreenSaver::State::Off:
case x11::ScreenSaver::State::Disabled:
return false;
case x11::ScreenSaver::State::On:
case x11::ScreenSaver::State::Cycle:
return true;
}
NOTREACHED();
}
class ScreensaverStatusWatcher : public x11::EventObserver {
public:
ScreensaverStatusWatcher() {
auto* connection = x11::Connection::Get();
x_screensaver_status_ = std::make_unique<x11::PropertyCache>(
connection, connection->default_root(),
std::vector<x11::Atom>{x11::GetAtom("_SCREENSAVER_STATUS")});
connection->AddEventObserver(this);
connection->screensaver().SelectInput(connection->default_root(),
x11::ScreenSaver::Event::NotifyMask);
auto reply =
connection->screensaver().QueryInfo(connection->default_root()).Sync();
if (reply) {
mit_screensaver_active_ = IsMitScreensaverActive(
static_cast<x11::ScreenSaver::State>(reply->state));
}
}
ScreensaverStatusWatcher(const ScreensaverStatusWatcher&) = delete;
ScreensaverStatusWatcher& operator=(const ScreensaverStatusWatcher&) = delete;
~ScreensaverStatusWatcher() override = default;
bool ScreensaverActive() {
if (mit_screensaver_active_) {
return true;
}
// Ironically, xscreensaver does not use the MIT-SCREENSAVER extension,
// so add a special check for xscreensaver.
auto* status = x_screensaver_status_->GetAs<x11::Atom>(
x11::GetAtom("_SCREENSAVER_STATUS"));
return status && *status == x11::GetAtom("LOCK");
}
private:
void OnEvent(const x11::Event& event) override {
if (auto* notify = event.As<x11::ScreenSaver::NotifyEvent>()) {
mit_screensaver_active_ = IsMitScreensaverActive(notify->state);
}
}
std::unique_ptr<x11::PropertyCache> x_screensaver_status_;
bool mit_screensaver_active_ = false;
};
} // namespace
bool IsXScreensaverActive() {
// Avoid calling into potentially missing X11 APIs in headless mode.
if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kHeadless)) {
return false;
}
static base::NoDestructor<ScreensaverStatusWatcher> watcher;
return watcher->ScreensaverActive();
}
} // namespace ui
|
