summaryrefslogtreecommitdiff
path: root/widget/VsyncDispatcher.cpp
blob: 7bb32b89bd3631c4cf02100deebd67383afa09c1 (plain)
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MainThreadUtils.h"
#include "VsyncDispatcher.h"
#include "VsyncSource.h"
#include "gfxPlatform.h"
#include "mozilla/layers/Compositor.h"
#include "mozilla/layers/CompositorBridgeParent.h"
#include "mozilla/layers/CompositorThread.h"

namespace mozilla {

CompositorVsyncDispatcher::CompositorVsyncDispatcher()
  : mCompositorObserverLock("CompositorObserverLock")
  , mDidShutdown(false)
{
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
}

CompositorVsyncDispatcher::~CompositorVsyncDispatcher()
{
  MOZ_ASSERT(XRE_IsParentProcess());
  // We auto remove this vsync dispatcher from the vsync source in the nsBaseWidget
}

void
CompositorVsyncDispatcher::NotifyVsync(TimeStamp aVsyncTimestamp)
{
  MutexAutoLock lock(mCompositorObserverLock);
  if (mCompositorVsyncObserver) {
    mCompositorVsyncObserver->NotifyVsync(aVsyncTimestamp);
  }
}

void
CompositorVsyncDispatcher::ObserveVsync(bool aEnable)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(XRE_IsParentProcess());
  if (mDidShutdown) {
    return;
  }

  if (aEnable) {
    gfxPlatform::GetPlatform()->GetHardwareVsync()->AddCompositorVsyncDispatcher(this);
  } else {
    gfxPlatform::GetPlatform()->GetHardwareVsync()->RemoveCompositorVsyncDispatcher(this);
  }
}

void
CompositorVsyncDispatcher::SetCompositorVsyncObserver(VsyncObserver* aVsyncObserver)
{
  // When remote compositing or running gtests, vsync observation is
  // initiated on the main thread. Otherwise, it is initiated from the compositor
  // thread.
  MOZ_ASSERT(NS_IsMainThread() || CompositorThreadHolder::IsInCompositorThread());

  { // scope lock
    MutexAutoLock lock(mCompositorObserverLock);
    mCompositorVsyncObserver = aVsyncObserver;
  }

  bool observeVsync = aVsyncObserver != nullptr;
  nsCOMPtr<nsIRunnable> vsyncControl = NewRunnableMethod<bool>(this,
                                        &CompositorVsyncDispatcher::ObserveVsync,
                                        observeVsync);
  NS_DispatchToMainThread(vsyncControl);
}

void
CompositorVsyncDispatcher::Shutdown()
{
  // Need to explicitly remove CompositorVsyncDispatcher when the nsBaseWidget shuts down.
  // Otherwise, we would get dead vsync notifications between when the nsBaseWidget
  // shuts down and the CompositorBridgeParent shuts down.
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
  ObserveVsync(false);
  mDidShutdown = true;
  { // scope lock
    MutexAutoLock lock(mCompositorObserverLock);
    mCompositorVsyncObserver = nullptr;
  }
}

RefreshTimerVsyncDispatcher::RefreshTimerVsyncDispatcher()
  : mRefreshTimersLock("RefreshTimers lock")
{
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
}

RefreshTimerVsyncDispatcher::~RefreshTimerVsyncDispatcher()
{
  MOZ_ASSERT(XRE_IsParentProcess());
  MOZ_ASSERT(NS_IsMainThread());
}

void
RefreshTimerVsyncDispatcher::NotifyVsync(TimeStamp aVsyncTimestamp)
{
  MutexAutoLock lock(mRefreshTimersLock);

  for (size_t i = 0; i < mChildRefreshTimers.Length(); i++) {
    mChildRefreshTimers[i]->NotifyVsync(aVsyncTimestamp);
  }

  if (mParentRefreshTimer) {
    mParentRefreshTimer->NotifyVsync(aVsyncTimestamp);
  }
}

void
RefreshTimerVsyncDispatcher::SetParentRefreshTimer(VsyncObserver* aVsyncObserver)
{
  MOZ_ASSERT(NS_IsMainThread());
  { // lock scope because UpdateVsyncStatus runs on main thread and will deadlock
    MutexAutoLock lock(mRefreshTimersLock);
    mParentRefreshTimer = aVsyncObserver;
  }

  UpdateVsyncStatus();
}

void
RefreshTimerVsyncDispatcher::AddChildRefreshTimer(VsyncObserver* aVsyncObserver)
{
  { // scope lock - called on pbackground thread
    MutexAutoLock lock(mRefreshTimersLock);
    MOZ_ASSERT(aVsyncObserver);
    if (!mChildRefreshTimers.Contains(aVsyncObserver)) {
      mChildRefreshTimers.AppendElement(aVsyncObserver);
    }
  }

  UpdateVsyncStatus();
}

void
RefreshTimerVsyncDispatcher::RemoveChildRefreshTimer(VsyncObserver* aVsyncObserver)
{
  { // scope lock - called on pbackground thread
    MutexAutoLock lock(mRefreshTimersLock);
    MOZ_ASSERT(aVsyncObserver);
    mChildRefreshTimers.RemoveElement(aVsyncObserver);
  }

  UpdateVsyncStatus();
}

void
RefreshTimerVsyncDispatcher::UpdateVsyncStatus()
{
  if (!NS_IsMainThread()) {
    NS_DispatchToMainThread(NewRunnableMethod(this,
                                              &RefreshTimerVsyncDispatcher::UpdateVsyncStatus));
    return;
  }

  gfx::VsyncSource::Display& display = gfxPlatform::GetPlatform()->GetHardwareVsync()->GetGlobalDisplay();
  display.NotifyRefreshTimerVsyncStatus(NeedsVsync());
}

bool
RefreshTimerVsyncDispatcher::NeedsVsync()
{
  MOZ_ASSERT(NS_IsMainThread());
  MutexAutoLock lock(mRefreshTimersLock);
  return (mParentRefreshTimer != nullptr) || !mChildRefreshTimers.IsEmpty();
}

} // namespace mozilla