1 files changed, 808 insertions, 0 deletions
diff --git a/dom/vr/VRDisplay.cpp b/dom/vr/VRDisplay.cpp
new file mode 100644
index 0000000000..47e02890af
--- /dev/null
+++ b/dom/vr/VRDisplay.cpp
@@ -0,0 +1,808 @@
+/* -*- 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 "nsWrapperCache.h"
+
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ElementBinding.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/UserActivation.h"
+#include "mozilla/dom/VRDisplay.h"
+#include "mozilla/dom/VRDisplayBinding.h"
+#include "mozilla/HoldDropJSObjects.h"
+#include "mozilla/Base64.h"
+#include "mozilla/ProfilerMarkers.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/gfx/DataSurfaceHelpers.h"
+#include "Navigator.h"
+#include "gfxUtils.h"
+#include "gfxVR.h"
+#include "VRDisplayClient.h"
+#include "VRManagerChild.h"
+#include "VRDisplayPresentation.h"
+#include "nsIObserverService.h"
+#include "nsIFrame.h"
+#include "nsISupportsPrimitives.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+namespace dom {
+
+VRFieldOfView::VRFieldOfView(nsISupports* aParent, double aUpDegrees,
+                             double aRightDegrees, double aDownDegrees,
+                             double aLeftDegrees)
+    : mParent(aParent),
+      mUpDegrees(aUpDegrees),
+      mRightDegrees(aRightDegrees),
+      mDownDegrees(aDownDegrees),
+      mLeftDegrees(aLeftDegrees) {}
+
+VRFieldOfView::VRFieldOfView(nsISupports* aParent,
+                             const gfx::VRFieldOfView& aSrc)
+    : mParent(aParent),
+      mUpDegrees(aSrc.upDegrees),
+      mRightDegrees(aSrc.rightDegrees),
+      mDownDegrees(aSrc.downDegrees),
+      mLeftDegrees(aSrc.leftDegrees) {}
+
+bool VRDisplayCapabilities::HasPosition() const {
+  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Position) ||
+         bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated);
+}
+
+bool VRDisplayCapabilities::HasOrientation() const {
+  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Orientation);
+}
+
+bool VRDisplayCapabilities::HasExternalDisplay() const {
+  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_External);
+}
+
+bool VRDisplayCapabilities::CanPresent() const {
+  return bool(mFlags & gfx::VRDisplayCapabilityFlags::Cap_Present);
+}
+
+uint32_t VRDisplayCapabilities::MaxLayers() const {
+  return CanPresent() ? 1 : 0;
+}
+
+void VRDisplay::UpdateDisplayClient(
+    already_AddRefed<gfx::VRDisplayClient> aClient) {
+  mClient = std::move(aClient);
+}
+
+/*static*/
+bool VRDisplay::RefreshVRDisplays(uint64_t aWindowId) {
+  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
+  return vm && vm->RefreshVRDisplaysWithCallback(aWindowId);
+}
+
+/*static*/
+void VRDisplay::UpdateVRDisplays(nsTArray<RefPtr<VRDisplay>>& aDisplays,
+                                 nsPIDOMWindowInner* aWindow) {
+  nsTArray<RefPtr<VRDisplay>> displays;
+
+  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
+  nsTArray<RefPtr<gfx::VRDisplayClient>> updatedDisplays;
+  if (vm) {
+    vm->GetVRDisplays(updatedDisplays);
+    for (size_t i = 0; i < updatedDisplays.Length(); i++) {
+      RefPtr<gfx::VRDisplayClient> display = updatedDisplays[i];
+      bool isNewDisplay = true;
+      for (size_t j = 0; j < aDisplays.Length(); j++) {
+        if (aDisplays[j]->GetClient()->GetDisplayInfo().GetDisplayID() ==
+            display->GetDisplayInfo().GetDisplayID()) {
+          displays.AppendElement(aDisplays[j]);
+          isNewDisplay = false;
+        } else {
+          RefPtr<gfx::VRDisplayClient> ref = display;
+          aDisplays[j]->UpdateDisplayClient(do_AddRef(display));
+          displays.AppendElement(aDisplays[j]);
+          isNewDisplay = false;
+        }
+      }
+
+      if (isNewDisplay) {
+        displays.AppendElement(new VRDisplay(aWindow, display));
+      }
+    }
+  }
+
+  aDisplays = std::move(displays);
+}
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(VRFieldOfView, mParent)
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRFieldOfView, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRFieldOfView, Release)
+
+JSObject* VRFieldOfView::WrapObject(JSContext* aCx,
+                                    JS::Handle<JSObject*> aGivenProto) {
+  return VRFieldOfView_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(VREyeParameters)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VREyeParameters)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent, mFOV)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+  tmp->mOffset = nullptr;
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VREyeParameters)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent, mFOV)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VREyeParameters)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mOffset)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VREyeParameters, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VREyeParameters, Release)
+
+VREyeParameters::VREyeParameters(nsISupports* aParent,
+                                 const gfx::Point3D& aEyeTranslation,
+                                 const gfx::VRFieldOfView& aFOV,
+                                 const gfx::IntSize& aRenderSize)
+    : mParent(aParent),
+      mEyeTranslation(aEyeTranslation),
+      mRenderSize(aRenderSize) {
+  mFOV = new VRFieldOfView(aParent, aFOV);
+  mozilla::HoldJSObjects(this);
+}
+
+VREyeParameters::~VREyeParameters() { mozilla::DropJSObjects(this); }
+
+VRFieldOfView* VREyeParameters::FieldOfView() { return mFOV; }
+
+void VREyeParameters::GetOffset(JSContext* aCx,
+                                JS::MutableHandle<JSObject*> aRetval,
+                                ErrorResult& aRv) {
+  if (!mOffset) {
+    // Lazily create the Float32Array
+    mOffset =
+        dom::Float32Array::Create(aCx, this, 3, mEyeTranslation.components);
+    if (!mOffset) {
+      aRv.NoteJSContextException(aCx);
+      return;
+    }
+  }
+  aRetval.set(mOffset);
+}
+
+JSObject* VREyeParameters::WrapObject(JSContext* aCx,
+                                      JS::Handle<JSObject*> aGivenProto) {
+  return VREyeParameters_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+VRStageParameters::VRStageParameters(
+    nsISupports* aParent, const gfx::Matrix4x4& aSittingToStandingTransform,
+    const gfx::Size& aSize)
+    : mParent(aParent),
+      mSittingToStandingTransform(aSittingToStandingTransform),
+      mSittingToStandingTransformArray(nullptr),
+      mSize(aSize) {
+  mozilla::HoldJSObjects(this);
+}
+
+VRStageParameters::~VRStageParameters() { mozilla::DropJSObjects(this); }
+
+JSObject* VRStageParameters::WrapObject(JSContext* aCx,
+                                        JS::Handle<JSObject*> aGivenProto) {
+  return VRStageParameters_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(VRStageParameters)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VRStageParameters)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+  tmp->mSittingToStandingTransformArray = nullptr;
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VRStageParameters)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VRStageParameters)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(
+      mSittingToStandingTransformArray)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRStageParameters, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRStageParameters, Release)
+
+void VRStageParameters::GetSittingToStandingTransform(
+    JSContext* aCx, JS::MutableHandle<JSObject*> aRetval, ErrorResult& aRv) {
+  if (!mSittingToStandingTransformArray) {
+    // Lazily create the Float32Array
+    mSittingToStandingTransformArray = dom::Float32Array::Create(
+        aCx, this, 16, mSittingToStandingTransform.components);
+    if (!mSittingToStandingTransformArray) {
+      aRv.NoteJSContextException(aCx);
+      return;
+    }
+  }
+  aRetval.set(mSittingToStandingTransformArray);
+}
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(VRDisplayCapabilities, mParent)
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRDisplayCapabilities, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRDisplayCapabilities, Release)
+
+JSObject* VRDisplayCapabilities::WrapObject(JSContext* aCx,
+                                            JS::Handle<JSObject*> aGivenProto) {
+  return VRDisplayCapabilities_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+VRPose::VRPose(nsISupports* aParent, const gfx::VRHMDSensorState& aState)
+    : Pose(aParent), mVRState(aState) {
+  mozilla::HoldJSObjects(this);
+}
+
+VRPose::VRPose(nsISupports* aParent) : Pose(aParent) {
+  mVRState.inputFrameID = 0;
+  mVRState.timestamp = 0.0;
+  mVRState.flags = gfx::VRDisplayCapabilityFlags::Cap_None;
+  mozilla::HoldJSObjects(this);
+}
+
+VRPose::~VRPose() { mozilla::DropJSObjects(this); }
+
+void VRPose::GetPosition(JSContext* aCx, JS::MutableHandle<JSObject*> aRetval,
+                         ErrorResult& aRv) {
+  const bool valid =
+      bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position) ||
+      bool(mVRState.flags &
+           gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated);
+  SetFloat32Array(aCx, this, aRetval, mPosition,
+                  valid ? mVRState.pose.position : nullptr, 3, aRv);
+}
+
+void VRPose::GetLinearVelocity(JSContext* aCx,
+                               JS::MutableHandle<JSObject*> aRetval,
+                               ErrorResult& aRv) {
+  const bool valid =
+      bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Position) ||
+      bool(mVRState.flags &
+           gfx::VRDisplayCapabilityFlags::Cap_PositionEmulated);
+  SetFloat32Array(aCx, this, aRetval, mLinearVelocity,
+                  valid ? mVRState.pose.linearVelocity : nullptr, 3, aRv);
+}
+
+void VRPose::GetLinearAcceleration(JSContext* aCx,
+                                   JS::MutableHandle<JSObject*> aRetval,
+                                   ErrorResult& aRv) {
+  const bool valid = bool(
+      mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_LinearAcceleration);
+  SetFloat32Array(aCx, this, aRetval, mLinearAcceleration,
+                  valid ? mVRState.pose.linearAcceleration : nullptr, 3, aRv);
+}
+
+void VRPose::GetOrientation(JSContext* aCx,
+                            JS::MutableHandle<JSObject*> aRetval,
+                            ErrorResult& aRv) {
+  const bool valid =
+      bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Orientation);
+  SetFloat32Array(aCx, this, aRetval, mOrientation,
+                  valid ? mVRState.pose.orientation : nullptr, 4, aRv);
+}
+
+void VRPose::GetAngularVelocity(JSContext* aCx,
+                                JS::MutableHandle<JSObject*> aRetval,
+                                ErrorResult& aRv) {
+  const bool valid =
+      bool(mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_Orientation);
+  SetFloat32Array(aCx, this, aRetval, mAngularVelocity,
+                  valid ? mVRState.pose.angularVelocity : nullptr, 3, aRv);
+}
+
+void VRPose::GetAngularAcceleration(JSContext* aCx,
+                                    JS::MutableHandle<JSObject*> aRetval,
+                                    ErrorResult& aRv) {
+  const bool valid = bool(
+      mVRState.flags & gfx::VRDisplayCapabilityFlags::Cap_AngularAcceleration);
+  SetFloat32Array(aCx, this, aRetval, mAngularAcceleration,
+                  valid ? mVRState.pose.angularAcceleration : nullptr, 3, aRv);
+}
+
+void VRPose::Update(const gfx::VRHMDSensorState& aState) { mVRState = aState; }
+
+JSObject* VRPose::WrapObject(JSContext* aCx,
+                             JS::Handle<JSObject*> aGivenProto) {
+  return VRPose_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+/* virtual */
+JSObject* VRDisplay::WrapObject(JSContext* aCx,
+                                JS::Handle<JSObject*> aGivenProto) {
+  return VRDisplay_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+VRDisplay::VRDisplay(nsPIDOMWindowInner* aWindow, gfx::VRDisplayClient* aClient)
+    : DOMEventTargetHelper(aWindow),
+      mClient(aClient),
+      mDepthNear(0.01f)  // Default value from WebVR Spec
+      ,
+      mDepthFar(10000.0f)  // Default value from WebVR Spec
+      ,
+      mVRNavigationEventDepth(0),
+      mShutdown(false) {
+  const gfx::VRDisplayInfo& info = aClient->GetDisplayInfo();
+  mCapabilities = new VRDisplayCapabilities(aWindow, info.GetCapabilities());
+  if (info.GetCapabilities() &
+      gfx::VRDisplayCapabilityFlags::Cap_StageParameters) {
+    mStageParameters = new VRStageParameters(
+        aWindow, info.GetSittingToStandingTransform(), info.GetStageSize());
+  }
+  mozilla::HoldJSObjects(this);
+  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+  if (MOZ_LIKELY(obs)) {
+    obs->AddObserver(this, "inner-window-destroyed", false);
+  }
+}
+
+VRDisplay::~VRDisplay() {
+  MOZ_ASSERT(mShutdown);
+  mozilla::DropJSObjects(this);
+}
+
+void VRDisplay::LastRelease() {
+  // We don't want to wait for the CC to free up the presentation
+  // for use in other documents, so we do this in LastRelease().
+  Shutdown();
+}
+
+already_AddRefed<VREyeParameters> VRDisplay::GetEyeParameters(VREye aEye) {
+  gfx::VRDisplayState::Eye eye = aEye == VREye::Left
+                                     ? gfx::VRDisplayState::Eye_Left
+                                     : gfx::VRDisplayState::Eye_Right;
+  RefPtr<VREyeParameters> params = new VREyeParameters(
+      GetParentObject(), mClient->GetDisplayInfo().GetEyeTranslation(eye),
+      mClient->GetDisplayInfo().GetEyeFOV(eye),
+      mClient->GetDisplayInfo().SuggestedEyeResolution());
+  return params.forget();
+}
+
+VRDisplayCapabilities* VRDisplay::Capabilities() { return mCapabilities; }
+
+VRStageParameters* VRDisplay::GetStageParameters() { return mStageParameters; }
+
+uint32_t VRDisplay::DisplayId() const {
+  const gfx::VRDisplayInfo& info = mClient->GetDisplayInfo();
+  return info.GetDisplayID();
+}
+
+void VRDisplay::GetDisplayName(nsAString& aDisplayName) const {
+  const gfx::VRDisplayInfo& info = mClient->GetDisplayInfo();
+  CopyUTF8toUTF16(MakeStringSpan(info.GetDisplayName()), aDisplayName);
+}
+
+void VRDisplay::UpdateFrameInfo() {
+  /**
+   * The WebVR 1.1 spec Requires that VRDisplay.getPose and
+   * VRDisplay.getFrameData must return the same values until the next
+   * VRDisplay.submitFrame.
+   *
+   * mFrameInfo is marked dirty at the end of the frame or start of a new
+   * composition and lazily created here in order to receive mid-frame
+   * pose-prediction updates while still ensuring conformance to the WebVR spec
+   * requirements.
+   *
+   * If we are not presenting WebVR content, the frame will never end and we
+   * should return the latest frame data always.
+   */
+  mFrameInfo.Clear();
+
+  if ((mFrameInfo.IsDirty() && IsPresenting()) ||
+      mClient->GetDisplayInfo().GetPresentingGroups() == 0) {
+    const gfx::VRHMDSensorState& state = mClient->GetSensorState();
+    const gfx::VRDisplayInfo& info = mClient->GetDisplayInfo();
+    mFrameInfo.Update(info, state, mDepthNear, mDepthFar);
+  }
+}
+
+bool VRDisplay::GetFrameData(VRFrameData& aFrameData) {
+  UpdateFrameInfo();
+  if (!(mFrameInfo.mVRState.flags &
+        gfx::VRDisplayCapabilityFlags::Cap_Orientation)) {
+    // We must have at minimum Cap_Orientation for a valid pose.
+    return false;
+  }
+  aFrameData.Update(mFrameInfo);
+  return true;
+}
+
+already_AddRefed<VRPose> VRDisplay::GetPose() {
+  UpdateFrameInfo();
+  RefPtr<VRPose> obj = new VRPose(GetParentObject(), mFrameInfo.mVRState);
+
+  return obj.forget();
+}
+
+void VRDisplay::ResetPose() {
+  // ResetPose is deprecated and unimplemented
+  // We must keep this stub function around as its referenced by
+  // VRDisplay.webidl. Not asserting here, as that could break existing web
+  // content.
+}
+
+void VRDisplay::StartVRNavigation() { mClient->StartVRNavigation(); }
+
+void VRDisplay::StartHandlingVRNavigationEvent() {
+  mHandlingVRNavigationEventStart = TimeStamp::Now();
+  ++mVRNavigationEventDepth;
+  TimeDuration timeout =
+      TimeDuration::FromMilliseconds(StaticPrefs::dom_vr_navigation_timeout());
+  // A 0 or negative TimeDuration indicates that content may take
+  // as long as it wishes to respond to the event, as long as
+  // it happens before the event exits.
+  if (timeout.ToMilliseconds() > 0) {
+    mClient->StopVRNavigation(timeout);
+  }
+}
+
+void VRDisplay::StopHandlingVRNavigationEvent() {
+  MOZ_ASSERT(mVRNavigationEventDepth > 0);
+  --mVRNavigationEventDepth;
+  if (mVRNavigationEventDepth == 0) {
+    mClient->StopVRNavigation(TimeDuration::FromMilliseconds(0));
+  }
+}
+
+bool VRDisplay::IsHandlingVRNavigationEvent() {
+  if (mVRNavigationEventDepth == 0) {
+    return false;
+  }
+  if (mHandlingVRNavigationEventStart.IsNull()) {
+    return false;
+  }
+  TimeDuration timeout =
+      TimeDuration::FromMilliseconds(StaticPrefs::dom_vr_navigation_timeout());
+  return timeout.ToMilliseconds() <= 0 ||
+         (TimeStamp::Now() - mHandlingVRNavigationEventStart) <= timeout;
+}
+
+void VRDisplay::OnPresentationGenerationChanged() { ExitPresentInternal(); }
+
+already_AddRefed<Promise> VRDisplay::RequestPresent(
+    const nsTArray<VRLayer>& aLayers, CallerType aCallerType,
+    ErrorResult& aRv) {
+  nsCOMPtr<nsIGlobalObject> global = GetParentObject();
+  if (!global) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  RefPtr<Promise> promise = Promise::Create(global, aRv);
+  NS_ENSURE_TRUE(!aRv.Failed(), nullptr);
+
+  bool isChromePresentation = aCallerType == CallerType::System;
+  uint32_t presentationGroup =
+      isChromePresentation ? gfx::kVRGroupChrome : gfx::kVRGroupContent;
+
+  mClient->SetXRAPIMode(gfx::VRAPIMode::WebVR);
+  if (!UserActivation::IsHandlingUserInput() && !isChromePresentation &&
+      !IsHandlingVRNavigationEvent() && StaticPrefs::dom_vr_require_gesture() &&
+      !IsPresenting()) {
+    // The WebVR API states that if called outside of a user gesture, the
+    // promise must be rejected.  We allow VR presentations to start within
+    // trusted events such as vrdisplayactivate, which triggers in response to
+    // HMD proximity sensors and when navigating within a VR presentation.
+    // This user gesture requirement is not enforced for chrome/system code.
+    promise->MaybeRejectWithUndefined();
+  } else if (!IsPresenting() && IsAnyPresenting(presentationGroup)) {
+    // Only one presentation allowed per VRDisplay on a
+    // first-come-first-serve basis.
+    // If this Javascript context is presenting, then we can replace our
+    // presentation with a new one containing new layers but we should never
+    // replace the presentation of another context.
+    // Simultaneous presentations in other groups are allowed in separate
+    // Javascript contexts to enable browser UI from chrome/system contexts.
+    // Eventually, this restriction will be loosened to enable multitasking
+    // use cases.
+    promise->MaybeRejectWithUndefined();
+  } else {
+    if (mPresentation) {
+      mPresentation->UpdateLayers(aLayers);
+    } else {
+      mPresentation = mClient->BeginPresentation(aLayers, presentationGroup);
+    }
+    mFrameInfo.Clear();
+    promise->MaybeResolve(JS::UndefinedHandleValue);
+  }
+  return promise.forget();
+}
+
+NS_IMETHODIMP
+VRDisplay::Observe(nsISupports* aSubject, const char* aTopic,
+                   const char16_t* aData) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (strcmp(aTopic, "inner-window-destroyed") == 0) {
+    nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
+    NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
+
+    uint64_t innerID;
+    nsresult rv = wrapper->GetData(&innerID);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (!GetOwner() || GetOwner()->WindowID() == innerID) {
+      Shutdown();
+    }
+
+    return NS_OK;
+  }
+
+  // This should not happen.
+  return NS_ERROR_FAILURE;
+}
+
+already_AddRefed<Promise> VRDisplay::ExitPresent(ErrorResult& aRv) {
+  nsCOMPtr<nsIGlobalObject> global = GetParentObject();
+  if (!global) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  RefPtr<Promise> promise = Promise::Create(global, aRv);
+  NS_ENSURE_TRUE(!aRv.Failed(), nullptr);
+
+  if (!IsPresenting()) {
+    // We can not exit a presentation outside of the context that
+    // started the presentation.
+    promise->MaybeRejectWithUndefined();
+  } else {
+    promise->MaybeResolve(JS::UndefinedHandleValue);
+    ExitPresentInternal();
+  }
+
+  return promise.forget();
+}
+
+void VRDisplay::ExitPresentInternal() { mPresentation = nullptr; }
+
+void VRDisplay::Shutdown() {
+  mShutdown = true;
+  ExitPresentInternal();
+  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+  if (MOZ_LIKELY(obs)) {
+    obs->RemoveObserver(this, "inner-window-destroyed");
+  }
+}
+
+void VRDisplay::GetLayers(nsTArray<VRLayer>& result) {
+  if (mPresentation) {
+    mPresentation->GetDOMLayers(result);
+  } else {
+    result = nsTArray<VRLayer>();
+  }
+}
+
+void VRDisplay::SubmitFrame() {
+  AUTO_PROFILER_TRACING_MARKER("VR", "SubmitFrameAtVRDisplay", OTHER);
+
+  if (mClient && !mClient->IsPresentationGenerationCurrent()) {
+    mPresentation = nullptr;
+    mClient->MakePresentationGenerationCurrent();
+  }
+
+  if (mPresentation) {
+    mPresentation->SubmitFrame();
+  }
+  mFrameInfo.Clear();
+}
+
+int32_t VRDisplay::RequestAnimationFrame(FrameRequestCallback& aCallback,
+                                         ErrorResult& aError) {
+  if (mShutdown) {
+    return 0;
+  }
+
+  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
+
+  int32_t handle;
+  aError = vm->ScheduleFrameRequestCallback(aCallback, &handle);
+  return handle;
+}
+
+void VRDisplay::CancelAnimationFrame(int32_t aHandle, ErrorResult& aError) {
+  gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
+  vm->CancelFrameRequestCallback(aHandle);
+}
+
+bool VRDisplay::IsPresenting() const {
+  // IsPresenting returns true only if this Javascript context is presenting
+  // and will return false if another context is presenting.
+  return mPresentation != nullptr;
+}
+
+bool VRDisplay::IsAnyPresenting(uint32_t aGroupMask) const {
+  // IsAnyPresenting returns true if either this VRDisplay object or any other
+  // from anther Javascript context is presenting with a group matching
+  // aGroupMask.
+  if (mPresentation && (mPresentation->GetGroup() & aGroupMask)) {
+    return true;
+  }
+  if (mClient->GetDisplayInfo().GetPresentingGroups() & aGroupMask) {
+    return true;
+  }
+  return false;
+}
+
+bool VRDisplay::IsConnected() const { return mClient->GetIsConnected(); }
+
+uint32_t VRDisplay::PresentingGroups() const {
+  return mClient->GetDisplayInfo().GetPresentingGroups();
+}
+
+uint32_t VRDisplay::GroupMask() const {
+  return mClient->GetDisplayInfo().GetGroupMask();
+}
+
+void VRDisplay::SetGroupMask(const uint32_t& aGroupMask) {
+  mClient->SetGroupMask(aGroupMask);
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(VRDisplay, DOMEventTargetHelper,
+                                   mCapabilities, mStageParameters)
+
+NS_IMPL_ADDREF_INHERITED(VRDisplay, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(VRDisplay, DOMEventTargetHelper)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(VRDisplay)
+  NS_INTERFACE_MAP_ENTRY(nsIObserver)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, DOMEventTargetHelper)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(VRFrameData)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(VRFrameData)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent, mPose)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+  tmp->mLeftProjectionMatrix = nullptr;
+  tmp->mLeftViewMatrix = nullptr;
+  tmp->mRightProjectionMatrix = nullptr;
+  tmp->mRightViewMatrix = nullptr;
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(VRFrameData)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent, mPose)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(VRFrameData)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mLeftProjectionMatrix)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mLeftViewMatrix)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mRightProjectionMatrix)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mRightViewMatrix)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(VRFrameData, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(VRFrameData, Release)
+
+VRFrameData::VRFrameData(nsISupports* aParent)
+    : mParent(aParent),
+      mLeftProjectionMatrix(nullptr),
+      mLeftViewMatrix(nullptr),
+      mRightProjectionMatrix(nullptr),
+      mRightViewMatrix(nullptr) {
+  mozilla::HoldJSObjects(this);
+  mPose = new VRPose(aParent);
+}
+
+VRFrameData::~VRFrameData() { mozilla::DropJSObjects(this); }
+
+/* static */
+already_AddRefed<VRFrameData> VRFrameData::Constructor(
+    const GlobalObject& aGlobal) {
+  RefPtr<VRFrameData> obj = new VRFrameData(aGlobal.GetAsSupports());
+  return obj.forget();
+}
+
+JSObject* VRFrameData::WrapObject(JSContext* aCx,
+                                  JS::Handle<JSObject*> aGivenProto) {
+  return VRFrameData_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+VRPose* VRFrameData::Pose() { return mPose; }
+
+double VRFrameData::Timestamp() const {
+  // Converting from seconds to milliseconds
+  return mFrameInfo.mVRState.timestamp * 1000.0f;
+}
+
+void VRFrameData::GetLeftProjectionMatrix(JSContext* aCx,
+                                          JS::MutableHandle<JSObject*> aRetval,
+                                          ErrorResult& aRv) {
+  Pose::SetFloat32Array(aCx, this, aRetval, mLeftProjectionMatrix,
+                        mFrameInfo.mLeftProjection.components, 16, aRv);
+}
+
+void VRFrameData::GetLeftViewMatrix(JSContext* aCx,
+                                    JS::MutableHandle<JSObject*> aRetval,
+                                    ErrorResult& aRv) {
+  Pose::SetFloat32Array(aCx, this, aRetval, mLeftViewMatrix,
+                        mFrameInfo.mLeftView.components, 16, aRv);
+}
+
+void VRFrameData::GetRightProjectionMatrix(JSContext* aCx,
+                                           JS::MutableHandle<JSObject*> aRetval,
+                                           ErrorResult& aRv) {
+  Pose::SetFloat32Array(aCx, this, aRetval, mRightProjectionMatrix,
+                        mFrameInfo.mRightProjection.components, 16, aRv);
+}
+
+void VRFrameData::GetRightViewMatrix(JSContext* aCx,
+                                     JS::MutableHandle<JSObject*> aRetval,
+                                     ErrorResult& aRv) {
+  Pose::SetFloat32Array(aCx, this, aRetval, mRightViewMatrix,
+                        mFrameInfo.mRightView.components, 16, aRv);
+}
+
+void VRFrameData::Update(const VRFrameInfo& aFrameInfo) {
+  mFrameInfo = aFrameInfo;
+  mPose->Update(mFrameInfo.mVRState);
+}
+
+void VRFrameInfo::Update(const gfx::VRDisplayInfo& aInfo,
+                         const gfx::VRHMDSensorState& aState, float aDepthNear,
+                         float aDepthFar) {
+  mVRState = aState;
+  if (mTimeStampOffset == 0.0f) {
+    /**
+     * A mTimeStampOffset value of 0.0f indicates that this is the first
+     * iteration and an offset has not yet been set.
+     *
+     * Generate a value for mTimeStampOffset such that if aState.timestamp is
+     * monotonically increasing, aState.timestamp + mTimeStampOffset will never
+     * be a negative number and will start at a pseudo-random offset
+     * between 1000.0f and 11000.0f seconds.
+     *
+     * We use a pseudo random offset rather than 0.0f just to discourage users
+     * from making the assumption that the timestamp returned in the WebVR API
+     * has a base of 0, which is not necessarily true in all UA's.
+     */
+    mTimeStampOffset =
+        float(rand()) / float(RAND_MAX) * 10000.0f + 1000.0f - aState.timestamp;
+  }
+  mVRState.timestamp = aState.timestamp + mTimeStampOffset;
+
+  // Avoid division by zero within ConstructProjectionMatrix
+  const float kEpsilon = 0.00001f;
+  if (fabs(aDepthFar - aDepthNear) < kEpsilon) {
+    aDepthFar = aDepthNear + kEpsilon;
+  }
+
+  const gfx::VRFieldOfView leftFOV =
+      aInfo.mDisplayState.eyeFOV[gfx::VRDisplayState::Eye_Left];
+  mLeftProjection =
+      leftFOV.ConstructProjectionMatrix(aDepthNear, aDepthFar, true);
+  const gfx::VRFieldOfView rightFOV =
+      aInfo.mDisplayState.eyeFOV[gfx::VRDisplayState::Eye_Right];
+  mRightProjection =
+      rightFOV.ConstructProjectionMatrix(aDepthNear, aDepthFar, true);
+  memcpy(mLeftView.components, aState.leftViewMatrix,
+         sizeof(aState.leftViewMatrix));
+  memcpy(mRightView.components, aState.rightViewMatrix,
+         sizeof(aState.rightViewMatrix));
+}
+
+VRFrameInfo::VRFrameInfo() : mTimeStampOffset(0.0f) {
+  mVRState.inputFrameID = 0;
+  mVRState.timestamp = 0.0;
+  mVRState.flags = gfx::VRDisplayCapabilityFlags::Cap_None;
+}
+
+bool VRFrameInfo::IsDirty() { return mVRState.timestamp == 0; }
+
+void VRFrameInfo::Clear() { mVRState.Clear(); }
+
+}  // namespace dom
+}  // namespace mozilla