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gecko-dev/dom/system/nsDeviceSensors.cpp

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/* -*- 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 "mozilla/Hal.h"
#include "mozilla/HalSensor.h"
#include "nsDeviceSensors.h"
#include "nsIDOMEvent.h"
#include "nsIDOMWindow.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMDocument.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIServiceManager.h"
#include "nsIServiceManager.h"
#include "mozilla/Preferences.h"
#include "mozilla/Attributes.h"
#include "mozilla/Services.h"
#include "nsIPermissionManager.h"
#include "mozilla/dom/DeviceLightEvent.h"
#include "mozilla/dom/DeviceOrientationEvent.h"
#include "mozilla/dom/DeviceProximityEvent.h"
#include "mozilla/dom/UserProximityEvent.h"
#include <cmath>
using namespace mozilla;
using namespace mozilla::dom;
using namespace hal;
#undef near
#define DEFAULT_SENSOR_POLL 100
static const nsTArray<nsIDOMWindow*>::index_type NoIndex =
nsTArray<nsIDOMWindow*>::NoIndex;
class nsDeviceSensorData final : public nsIDeviceSensorData
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIDEVICESENSORDATA
nsDeviceSensorData(unsigned long type, double x, double y, double z);
private:
~nsDeviceSensorData();
protected:
unsigned long mType;
double mX, mY, mZ;
};
nsDeviceSensorData::nsDeviceSensorData(unsigned long type, double x, double y, double z)
: mType(type), mX(x), mY(y), mZ(z)
{
}
NS_INTERFACE_MAP_BEGIN(nsDeviceSensorData)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDeviceSensorData)
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(nsDeviceSensorData)
NS_IMPL_RELEASE(nsDeviceSensorData)
nsDeviceSensorData::~nsDeviceSensorData()
{
}
NS_IMETHODIMP nsDeviceSensorData::GetType(uint32_t *aType)
{
NS_ENSURE_ARG_POINTER(aType);
*aType = mType;
return NS_OK;
}
NS_IMETHODIMP nsDeviceSensorData::GetX(double *aX)
{
NS_ENSURE_ARG_POINTER(aX);
*aX = mX;
return NS_OK;
}
NS_IMETHODIMP nsDeviceSensorData::GetY(double *aY)
{
NS_ENSURE_ARG_POINTER(aY);
*aY = mY;
return NS_OK;
}
NS_IMETHODIMP nsDeviceSensorData::GetZ(double *aZ)
{
NS_ENSURE_ARG_POINTER(aZ);
*aZ = mZ;
return NS_OK;
}
NS_IMPL_ISUPPORTS(nsDeviceSensors, nsIDeviceSensors)
nsDeviceSensors::nsDeviceSensors()
{
mIsUserProximityNear = false;
mLastDOMMotionEventTime = TimeStamp::Now();
mEnabled = Preferences::GetBool("device.sensors.enabled", true);
for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
nsTArray<nsIDOMWindow*> *windows = new nsTArray<nsIDOMWindow*>();
mWindowListeners.AppendElement(windows);
}
mLastDOMMotionEventTime = TimeStamp::Now();
}
nsDeviceSensors::~nsDeviceSensors()
{
for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
if (IsSensorEnabled(i))
UnregisterSensorObserver((SensorType)i, this);
}
for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
delete mWindowListeners[i];
}
}
NS_IMETHODIMP nsDeviceSensors::HasWindowListener(uint32_t aType, nsIDOMWindow *aWindow, bool *aRetVal)
{
if (!mEnabled)
*aRetVal = false;
else
*aRetVal = mWindowListeners[aType]->IndexOf(aWindow) != NoIndex;
return NS_OK;
}
class DeviceSensorTestEvent : public Runnable
{
public:
DeviceSensorTestEvent(nsDeviceSensors* aTarget, uint32_t aType)
: mozilla::Runnable("DeviceSensorTestEvent")
, mTarget(aTarget)
, mType(aType)
{
}
NS_IMETHOD Run() override
{
SensorData sensorData;
sensorData.sensor() = static_cast<SensorType>(mType);
sensorData.timestamp() = PR_Now();
sensorData.values().AppendElement(0.5f);
sensorData.values().AppendElement(0.5f);
sensorData.values().AppendElement(0.5f);
sensorData.values().AppendElement(0.5f);
sensorData.accuracy() = SENSOR_ACCURACY_UNRELIABLE;
mTarget->Notify(sensorData);
return NS_OK;
}
private:
RefPtr<nsDeviceSensors> mTarget;
uint32_t mType;
};
static bool sTestSensorEvents = false;
NS_IMETHODIMP nsDeviceSensors::AddWindowListener(uint32_t aType, nsIDOMWindow *aWindow)
{
if (!mEnabled)
return NS_OK;
if (mWindowListeners[aType]->IndexOf(aWindow) != NoIndex)
return NS_OK;
if (!IsSensorEnabled(aType)) {
RegisterSensorObserver((SensorType)aType, this);
}
mWindowListeners[aType]->AppendElement(aWindow);
static bool sPrefCacheInitialized = false;
if (!sPrefCacheInitialized) {
sPrefCacheInitialized = true;
Preferences::AddBoolVarCache(&sTestSensorEvents,
"device.sensors.test.events",
false);
}
if (sTestSensorEvents) {
nsCOMPtr<nsIRunnable> event = new DeviceSensorTestEvent(this, aType);
NS_DispatchToCurrentThread(event);
}
return NS_OK;
}
NS_IMETHODIMP nsDeviceSensors::RemoveWindowListener(uint32_t aType, nsIDOMWindow *aWindow)
{
if (mWindowListeners[aType]->IndexOf(aWindow) == NoIndex)
return NS_OK;
mWindowListeners[aType]->RemoveElement(aWindow);
if (mWindowListeners[aType]->Length() == 0)
UnregisterSensorObserver((SensorType)aType, this);
return NS_OK;
}
NS_IMETHODIMP nsDeviceSensors::RemoveWindowAsListener(nsIDOMWindow *aWindow)
{
for (int i = 0; i < NUM_SENSOR_TYPE; i++) {
RemoveWindowListener((SensorType)i, aWindow);
}
return NS_OK;
}
static bool
WindowCannotReceiveSensorEvent (nsPIDOMWindowInner* aWindow)
{
// Check to see if this window is in the background. If
// it is and it does not have the "background-sensors" permission,
// don't send any device motion events to it.
if (!aWindow || !aWindow->IsCurrentInnerWindow()) {
return true;
}
bool disabled = aWindow->GetOuterWindow()->IsBackground() ||
!aWindow->IsTopLevelWindowActive();
if (!disabled) {
nsCOMPtr<nsPIDOMWindowOuter> top = aWindow->GetScriptableTop();
nsCOMPtr<nsIScriptObjectPrincipal> sop = do_QueryInterface(aWindow);
nsCOMPtr<nsIScriptObjectPrincipal> topSop = do_QueryInterface(top);
if (!sop || !topSop) {
return true;
}
nsIPrincipal* principal = sop->GetPrincipal();
nsIPrincipal* topPrincipal = topSop->GetPrincipal();
if (!principal || !topPrincipal) {
return true;
}
disabled = !principal->Subsumes(topPrincipal);
}
if (disabled) {
nsCOMPtr<nsIPermissionManager> permMgr =
services::GetPermissionManager();
NS_ENSURE_TRUE(permMgr, true);
uint32_t permission = nsIPermissionManager::DENY_ACTION;
permMgr->TestPermissionFromWindow(aWindow, "background-sensors", &permission);
return permission != nsIPermissionManager::ALLOW_ACTION;
}
return false;
}
// Holds the device orientation in Euler angle degrees (azimuth, pitch, roll).
struct Orientation
{
enum OrientationReference
{
kRelative = 0,
kAbsolute
};
static Orientation RadToDeg(const Orientation& aOrient)
{
const static double kRadToDeg = 180.0 / M_PI;
return { aOrient.alpha * kRadToDeg,
aOrient.beta * kRadToDeg,
aOrient.gamma * kRadToDeg };
}
double alpha;
double beta;
double gamma;
};
static Orientation
RotationVectorToOrientation(double aX, double aY, double aZ, double aW)
{
static const double kFuzzyOne = 1.0 - 1e-6;
static const double kCircleRad = 2.0 * M_PI;
Orientation orient = { 2.0 * std::atan2(aY, aW),
M_PI_2,
0.0 };
const double sqX = aX * aX;
const double sqY = aY * aY;
const double sqZ = aZ * aZ;
const double sqW = aW * aW;
const double unitLength = sqX + sqY + sqZ + sqW;
const double xwyz = 2.0 * (aX * aW + aY * aZ) / unitLength;
if (xwyz < -kFuzzyOne) {
orient.alpha *= -1.0;
orient.beta *= -1.0;
} else if (xwyz <= kFuzzyOne) {
const double gammaX = -sqX - sqY + sqZ + sqW;
const double gammaY = 2.0 * (aY * aW - aX * aZ);
const double alphaX = -sqX + sqY - sqZ + sqW;
const double alphaY = 2.0 * (aZ * aW - aX * aY);
const double fac = gammaX > 0 ? 1.0 : -1.0;
orient.alpha = std::fmod(kCircleRad + std::atan2(fac * alphaY, fac * alphaX),
kCircleRad);
orient.beta = fac * std::asin(xwyz);
orient.gamma = std::atan2(fac * gammaY, fac * gammaX);
if (fac < 0.0) {
orient.beta = fmod(M_PI + orient.beta, M_PI);
}
}
return Orientation::RadToDeg(orient);
}
void
nsDeviceSensors::Notify(const mozilla::hal::SensorData& aSensorData)
{
uint32_t type = aSensorData.sensor();
const InfallibleTArray<float>& values = aSensorData.values();
size_t len = values.Length();
double x = len > 0 ? values[0] : 0.0;
double y = len > 1 ? values[1] : 0.0;
double z = len > 2 ? values[2] : 0.0;
double w = len > 3 ? values[3] : 0.0;
PRTime timestamp = aSensorData.timestamp();
nsCOMArray<nsIDOMWindow> windowListeners;
for (uint32_t i = 0; i < mWindowListeners[type]->Length(); i++) {
windowListeners.AppendObject(mWindowListeners[type]->SafeElementAt(i));
}
for (uint32_t i = windowListeners.Count(); i > 0 ; ) {
--i;
nsCOMPtr<nsPIDOMWindowInner> pwindow = do_QueryInterface(windowListeners[i]);
if (WindowCannotReceiveSensorEvent(pwindow)) {
continue;
}
if (nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(pwindow->GetDoc())) {
nsCOMPtr<mozilla::dom::EventTarget> target = do_QueryInterface(windowListeners[i]);
if (type == nsIDeviceSensorData::TYPE_ACCELERATION ||
type == nsIDeviceSensorData::TYPE_LINEAR_ACCELERATION ||
type == nsIDeviceSensorData::TYPE_GYROSCOPE) {
FireDOMMotionEvent(domDoc, target, type, timestamp, x, y, z);
} else if (type == nsIDeviceSensorData::TYPE_ORIENTATION) {
FireDOMOrientationEvent(target, x, y, z, Orientation::kAbsolute);
} else if (type == nsIDeviceSensorData::TYPE_ROTATION_VECTOR) {
const Orientation orient = RotationVectorToOrientation(x, y, z, w);
FireDOMOrientationEvent(target, orient.alpha, orient.beta, orient.gamma,
Orientation::kAbsolute);
} else if (type == nsIDeviceSensorData::TYPE_GAME_ROTATION_VECTOR) {
const Orientation orient = RotationVectorToOrientation(x, y, z, w);
FireDOMOrientationEvent(target, orient.alpha, orient.beta, orient.gamma,
Orientation::kRelative);
} else if (type == nsIDeviceSensorData::TYPE_PROXIMITY) {
FireDOMProximityEvent(target, x, y, z);
} else if (type == nsIDeviceSensorData::TYPE_LIGHT) {
FireDOMLightEvent(target, x);
}
}
}
}
void
nsDeviceSensors::FireDOMLightEvent(mozilla::dom::EventTarget* aTarget,
double aValue)
{
DeviceLightEventInit init;
init.mBubbles = true;
init.mCancelable = false;
init.mValue = round(aValue);
RefPtr<DeviceLightEvent> event =
DeviceLightEvent::Constructor(aTarget, NS_LITERAL_STRING("devicelight"), init);
event->SetTrusted(true);
bool defaultActionEnabled;
aTarget->DispatchEvent(event, &defaultActionEnabled);
}
void
nsDeviceSensors::FireDOMProximityEvent(mozilla::dom::EventTarget* aTarget,
double aValue,
double aMin,
double aMax)
{
DeviceProximityEventInit init;
init.mBubbles = true;
init.mCancelable = false;
init.mValue = aValue;
init.mMin = aMin;
init.mMax = aMax;
RefPtr<DeviceProximityEvent> event =
DeviceProximityEvent::Constructor(aTarget,
NS_LITERAL_STRING("deviceproximity"),
init);
event->SetTrusted(true);
bool defaultActionEnabled;
aTarget->DispatchEvent(event, &defaultActionEnabled);
// Some proximity sensors only support a binary near or
// far measurement. In this case, the sensor should report
// its maximum range value in the far state and a lesser
// value in the near state.
bool near = (aValue < aMax);
if (mIsUserProximityNear != near) {
mIsUserProximityNear = near;
FireDOMUserProximityEvent(aTarget, mIsUserProximityNear);
}
}
void
nsDeviceSensors::FireDOMUserProximityEvent(mozilla::dom::EventTarget* aTarget,
bool aNear)
{
UserProximityEventInit init;
init.mBubbles = true;
init.mCancelable = false;
init.mNear = aNear;
RefPtr<UserProximityEvent> event =
UserProximityEvent::Constructor(aTarget,
NS_LITERAL_STRING("userproximity"),
init);
event->SetTrusted(true);
bool defaultActionEnabled;
aTarget->DispatchEvent(event, &defaultActionEnabled);
}
void
nsDeviceSensors::FireDOMOrientationEvent(EventTarget* aTarget,
double aAlpha,
double aBeta,
double aGamma,
bool aIsAbsolute)
{
DeviceOrientationEventInit init;
init.mBubbles = true;
init.mCancelable = false;
init.mAlpha.SetValue(aAlpha);
init.mBeta.SetValue(aBeta);
init.mGamma.SetValue(aGamma);
init.mAbsolute = aIsAbsolute;
auto Dispatch = [&](EventTarget* aEventTarget, const nsAString& aType)
{
RefPtr<DeviceOrientationEvent> event =
DeviceOrientationEvent::Constructor(aEventTarget, aType, init);
event->SetTrusted(true);
bool dummy;
aEventTarget->DispatchEvent(event, &dummy);
};
Dispatch(aTarget, aIsAbsolute ? NS_LITERAL_STRING("absolutedeviceorientation") :
NS_LITERAL_STRING("deviceorientation"));
// This is used to determine whether relative events have been dispatched
// during the current session, in which case we don't dispatch the additional
// compatibility events.
static bool sIsDispatchingRelativeEvents = false;
sIsDispatchingRelativeEvents = sIsDispatchingRelativeEvents || !aIsAbsolute;
// Android devices with SENSOR_GAME_ROTATION_VECTOR support dispatch
// relative events for "deviceorientation" by default, while other platforms
// and devices without such support dispatch absolute events by default.
if (aIsAbsolute && !sIsDispatchingRelativeEvents) {
// For absolute events on devices without support for relative events,
// we need to additionally dispatch type "deviceorientation" to keep
// backwards-compatibility.
Dispatch(aTarget, NS_LITERAL_STRING("deviceorientation"));
}
}
void
nsDeviceSensors::FireDOMMotionEvent(nsIDOMDocument *domdoc,
EventTarget* target,
uint32_t type,
PRTime timestamp,
double x,
double y,
double z)
{
// Attempt to coalesce events
TimeDuration sensorPollDuration =
TimeDuration::FromMilliseconds(DEFAULT_SENSOR_POLL);
bool fireEvent =
(TimeStamp::Now() > mLastDOMMotionEventTime + sensorPollDuration) ||
sTestSensorEvents;
switch (type) {
case nsIDeviceSensorData::TYPE_LINEAR_ACCELERATION:
if (!mLastAcceleration) {
mLastAcceleration.emplace();
}
mLastAcceleration->mX.SetValue(x);
mLastAcceleration->mY.SetValue(y);
mLastAcceleration->mZ.SetValue(z);
break;
case nsIDeviceSensorData::TYPE_ACCELERATION:
if (!mLastAccelerationIncludingGravity) {
mLastAccelerationIncludingGravity.emplace();
}
mLastAccelerationIncludingGravity->mX.SetValue(x);
mLastAccelerationIncludingGravity->mY.SetValue(y);
mLastAccelerationIncludingGravity->mZ.SetValue(z);
break;
case nsIDeviceSensorData::TYPE_GYROSCOPE:
if (!mLastRotationRate) {
mLastRotationRate.emplace();
}
mLastRotationRate->mAlpha.SetValue(x);
mLastRotationRate->mBeta.SetValue(y);
mLastRotationRate->mGamma.SetValue(z);
break;
}
if (fireEvent) {
if (!mLastAcceleration) {
mLastAcceleration.emplace();
}
if (!mLastAccelerationIncludingGravity) {
mLastAccelerationIncludingGravity.emplace();
}
if (!mLastRotationRate) {
mLastRotationRate.emplace();
}
} else if (!mLastAcceleration ||
!mLastAccelerationIncludingGravity ||
!mLastRotationRate) {
return;
}
nsCOMPtr<nsIDOMEvent> event;
domdoc->CreateEvent(NS_LITERAL_STRING("DeviceMotionEvent"), getter_AddRefs(event));
DeviceMotionEvent* me = static_cast<DeviceMotionEvent*>(event.get());
me->InitDeviceMotionEvent(NS_LITERAL_STRING("devicemotion"),
true,
false,
*mLastAcceleration,
*mLastAccelerationIncludingGravity,
*mLastRotationRate,
Nullable<double>(DEFAULT_SENSOR_POLL),
Nullable<uint64_t>(timestamp));
event->SetTrusted(true);
bool defaultActionEnabled = true;
target->DispatchEvent(event, &defaultActionEnabled);
mLastRotationRate.reset();
mLastAccelerationIncludingGravity.reset();
mLastAcceleration.reset();
mLastDOMMotionEventTime = TimeStamp::Now();
}
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