gecko-dev/dom/vr/VREventObserver.cpp
Kearwood "Kip" Gilbert b91be1697a Bug 1402147 - Part 1: Fire VRDisplayConnect event for VR displays that are already enumerated when a page is loaded r=daoshengmu
MozReview-Commit-ID: 7zQOSYJ6tkg

--HG--
extra : rebase_source : e2535cb282475795a6107a002cce629049258b38
2018-01-04 14:27:03 -08:00

169 lines
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "VREventObserver.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "VRManagerChild.h"
#include "mozilla/Telemetry.h"
namespace mozilla {
namespace dom {
using namespace gfx;
/**
* This class is used by nsGlobalWindow to implement window.onvrdisplayactivate,
* window.onvrdisplaydeactivate, window.onvrdisplayconnected,
* window.onvrdisplaydisconnected, and window.onvrdisplaypresentchange.
*/
VREventObserver::VREventObserver(nsGlobalWindowInner* aGlobalWindow)
: mWindow(aGlobalWindow)
, mIs2DView(true)
, mHasReset(false)
{
MOZ_ASSERT(aGlobalWindow);
UpdateSpentTimeIn2DTelemetry(false);
VRManagerChild* vmc = VRManagerChild::Get();
if (vmc) {
vmc->AddListener(this);
}
}
VREventObserver::~VREventObserver()
{
DisconnectFromOwner();
}
void
VREventObserver::DisconnectFromOwner()
{
// In the event that nsGlobalWindow is deallocated, VREventObserver may
// still be AddRef'ed elsewhere. Ensure that we don't UAF by
// dereferencing mWindow.
UpdateSpentTimeIn2DTelemetry(true);
mWindow = nullptr;
// Unregister from VRManagerChild
if (VRManagerChild::IsCreated()) {
VRManagerChild* vmc = VRManagerChild::Get();
vmc->RemoveListener(this);
}
}
void
VREventObserver::UpdateSpentTimeIn2DTelemetry(bool aUpdate)
{
// mHasReset for avoiding setting the telemetry continuously
// for the telemetry is already been set when it is at the background.
// then, it would be set again when the process is exit and calling
// VREventObserver::DisconnectFromOwner().
if (mWindow && mIs2DView && aUpdate && mHasReset) {
// The WebVR content is closed, and we will collect the telemetry info
// for the users who view it in 2D view only.
Telemetry::Accumulate(Telemetry::WEBVR_USERS_VIEW_IN, 0);
Telemetry::AccumulateTimeDelta(Telemetry::WEBVR_TIME_SPENT_VIEWING_IN_2D,
mSpendTimeIn2DView);
mHasReset = false;
} else if (!aUpdate) {
mSpendTimeIn2DView = TimeStamp::Now();
mHasReset = true;
}
}
void
VREventObserver::NotifyAfterLoad()
{
if (VRManagerChild::IsCreated()) {
VRManagerChild* vmc = VRManagerChild::Get();
vmc->FireDOMVRDisplayConnectEventsForLoad(this);
}
}
void
VREventObserver::NotifyVRDisplayMounted(uint32_t aDisplayID)
{
if (mWindow && mWindow->AsInner()->IsCurrentInnerWindow()) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
mWindow->DispatchVRDisplayActivate(aDisplayID,
VRDisplayEventReason::Mounted);
}
}
void
VREventObserver::NotifyVRDisplayNavigation(uint32_t aDisplayID)
{
if (mWindow && mWindow->AsInner()->IsCurrentInnerWindow()) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
mWindow->DispatchVRDisplayActivate(aDisplayID,
VRDisplayEventReason::Navigation);
}
}
void
VREventObserver::NotifyVRDisplayRequested(uint32_t aDisplayID)
{
if (mWindow && mWindow->AsInner()->IsCurrentInnerWindow()) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
mWindow->DispatchVRDisplayActivate(aDisplayID,
VRDisplayEventReason::Requested);
}
}
void
VREventObserver::NotifyVRDisplayUnmounted(uint32_t aDisplayID)
{
if (mWindow && mWindow->AsInner()->IsCurrentInnerWindow()) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
mWindow->DispatchVRDisplayDeactivate(aDisplayID,
VRDisplayEventReason::Unmounted);
}
}
void
VREventObserver::NotifyVRDisplayConnect(uint32_t aDisplayID)
{
/**
* We do not call nsGlobalWindow::NotifyActiveVRDisplaysChanged here, as we
* can assume that a newly enumerated display is not presenting WebVR
* content.
*/
if (mWindow && mWindow->AsInner()->IsCurrentInnerWindow()) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
mWindow->DispatchVRDisplayConnect(aDisplayID);
}
}
void
VREventObserver::NotifyVRDisplayDisconnect(uint32_t aDisplayID)
{
if (mWindow && mWindow->AsInner()->IsCurrentInnerWindow()) {
mWindow->NotifyActiveVRDisplaysChanged();
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
mWindow->DispatchVRDisplayDisconnect(aDisplayID);
}
}
void
VREventObserver::NotifyVRDisplayPresentChange(uint32_t aDisplayID)
{
// When switching to HMD present mode, it is no longer
// to be a 2D view.
mIs2DView = false;
if (mWindow && mWindow->AsInner()->IsCurrentInnerWindow()) {
mWindow->NotifyActiveVRDisplaysChanged();
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
mWindow->DispatchVRDisplayPresentChange(aDisplayID);
}
}
} // namespace dom
} // namespace mozilla