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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/renderer/device_sensors/device_orientation_event_pump.h"
#include <cmath>
#include "base/logging.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_thread.h"
#include "content/renderer/render_thread_impl.h"
#include "services/device/public/mojom/sensor.mojom.h"
#include "services/service_manager/public/cpp/interface_provider.h"
namespace {
bool IsAngleDifferentThreshold(bool has_angle1,
double angle1,
bool has_angle2,
double angle2) {
if (has_angle1 != has_angle2)
return true;
return (has_angle1 &&
std::fabs(angle1 - angle2) >=
content::DeviceOrientationEventPump::kOrientationThreshold);
}
bool IsSignificantlyDifferent(const device::OrientationData& data1,
const device::OrientationData& data2) {
return IsAngleDifferentThreshold(data1.has_alpha, data1.alpha,
data2.has_alpha, data2.alpha) ||
IsAngleDifferentThreshold(data1.has_beta, data1.beta, data2.has_beta,
data2.beta) ||
IsAngleDifferentThreshold(data1.has_gamma, data1.gamma,
data2.has_gamma, data2.gamma);
}
} // namespace
namespace content {
template class DeviceSensorEventPump<blink::WebDeviceOrientationListener>;
const double DeviceOrientationEventPump::kOrientationThreshold = 0.1;
DeviceOrientationEventPump::DeviceOrientationEventPump(RenderThread* thread,
bool absolute)
: DeviceSensorEventPump<blink::WebDeviceOrientationListener>(thread),
relative_orientation_sensor_(
this,
device::mojom::SensorType::RELATIVE_ORIENTATION_EULER_ANGLES),
absolute_orientation_sensor_(
this,
device::mojom::SensorType::ABSOLUTE_ORIENTATION_EULER_ANGLES),
absolute_(absolute),
fall_back_to_absolute_orientation_sensor_(!absolute) {}
DeviceOrientationEventPump::~DeviceOrientationEventPump() {}
void DeviceOrientationEventPump::SendStartMessage() {
// When running layout tests, those observers should not listen to the
// actual hardware changes. In order to make that happen, don't connect
// the other end of the mojo pipe to anything.
//
// TODO(sammc): Remove this when JS layout test support for shared buffers
// is ready and the layout tests are converted to use that for mocking.
// https://crbug.com/774183
if (!RenderThreadImpl::current() ||
RenderThreadImpl::current()->layout_test_mode()) {
return;
}
SendStartMessageImpl();
}
void DeviceOrientationEventPump::SendStopMessage() {
// SendStopMessage() gets called both when the page visibility changes and if
// all device orientation event listeners are unregistered. Since removing
// the event listener is more rare than the page visibility changing,
// Sensor::Suspend() is used to optimize this case for not doing extra work.
relative_orientation_sensor_.Stop();
// This is needed in case we fallback to using the absolute orientation
// sensor. In this case, the relative orientation sensor is marked as
// SensorState::SHOULD_SUSPEND, and if the relative orientation sensor
// is not available, the absolute orientation sensor should also be marked as
// SensorState::SHOULD_SUSPEND, but only after the
// absolute_orientation_sensor_.Start() is called for initializing
// the absolute orientation sensor in
// DeviceOrientationEventPump::DidStartIfPossible().
if (relative_orientation_sensor_.sensor_state ==
SensorState::SHOULD_SUSPEND &&
fall_back_to_absolute_orientation_sensor_) {
should_suspend_absolute_orientation_sensor_ = true;
}
absolute_orientation_sensor_.Stop();
}
void DeviceOrientationEventPump::SendFakeDataForTesting(void* fake_data) {
if (!listener())
return;
device::OrientationData data =
*static_cast<device::OrientationData*>(fake_data);
listener()->DidChangeDeviceOrientation(data);
}
void DeviceOrientationEventPump::FireEvent() {
device::OrientationData data;
DCHECK(listener());
GetDataFromSharedMemory(&data);
if (ShouldFireEvent(data)) {
data_ = data;
listener()->DidChangeDeviceOrientation(data);
}
}
void DeviceOrientationEventPump::DidStartIfPossible() {
if (!absolute_ && !relative_orientation_sensor_.sensor &&
fall_back_to_absolute_orientation_sensor_ && sensor_provider_) {
// When relative orientation sensor is not available fall back to using
// the absolute orientation sensor but only on the first failure.
fall_back_to_absolute_orientation_sensor_ = false;
absolute_orientation_sensor_.Start(sensor_provider_.get());
if (should_suspend_absolute_orientation_sensor_) {
// The absolute orientation sensor needs to be marked as
// SensorState::SUSPENDED when it is successfully initialized.
absolute_orientation_sensor_.sensor_state = SensorState::SHOULD_SUSPEND;
should_suspend_absolute_orientation_sensor_ = false;
}
return;
}
DeviceSensorEventPump::DidStartIfPossible();
}
void DeviceOrientationEventPump::SendStartMessageImpl() {
if (!sensor_provider_) {
RenderFrame* const render_frame = GetRenderFrame();
if (!render_frame)
return;
render_frame->GetRemoteInterfaces()->GetInterface(
mojo::MakeRequest(&sensor_provider_));
sensor_provider_.set_connection_error_handler(
base::BindOnce(&DeviceSensorEventPump::HandleSensorProviderError,
base::Unretained(this)));
}
if (absolute_) {
absolute_orientation_sensor_.Start(sensor_provider_.get());
} else {
fall_back_to_absolute_orientation_sensor_ = true;
should_suspend_absolute_orientation_sensor_ = false;
relative_orientation_sensor_.Start(sensor_provider_.get());
}
}
bool DeviceOrientationEventPump::SensorsReadyOrErrored() const {
if (!relative_orientation_sensor_.ReadyOrErrored() ||
!absolute_orientation_sensor_.ReadyOrErrored()) {
return false;
}
// At most one sensor can be successfully initialized.
DCHECK(!relative_orientation_sensor_.sensor ||
!absolute_orientation_sensor_.sensor);
return true;
}
void DeviceOrientationEventPump::GetDataFromSharedMemory(
device::OrientationData* data) {
data->all_available_sensors_are_active = true;
if (!absolute_ && relative_orientation_sensor_.SensorReadingCouldBeRead()) {
// For DeviceOrientation Event, this provides relative orientation data.
data->all_available_sensors_are_active =
relative_orientation_sensor_.reading.timestamp() != 0.0;
if (!data->all_available_sensors_are_active)
return;
data->alpha = relative_orientation_sensor_.reading.orientation_euler.z;
data->beta = relative_orientation_sensor_.reading.orientation_euler.x;
data->gamma = relative_orientation_sensor_.reading.orientation_euler.y;
data->has_alpha = !std::isnan(
relative_orientation_sensor_.reading.orientation_euler.z.value());
data->has_beta = !std::isnan(
relative_orientation_sensor_.reading.orientation_euler.x.value());
data->has_gamma = !std::isnan(
relative_orientation_sensor_.reading.orientation_euler.y.value());
data->absolute = false;
} else if (absolute_orientation_sensor_.SensorReadingCouldBeRead()) {
// For DeviceOrientationAbsolute Event, this provides absolute orientation
// data.
//
// For DeviceOrientation Event, this provides absolute orientation data if
// relative orientation data is not available.
data->all_available_sensors_are_active =
absolute_orientation_sensor_.reading.timestamp() != 0.0;
if (!data->all_available_sensors_are_active)
return;
data->alpha = absolute_orientation_sensor_.reading.orientation_euler.z;
data->beta = absolute_orientation_sensor_.reading.orientation_euler.x;
data->gamma = absolute_orientation_sensor_.reading.orientation_euler.y;
data->has_alpha = !std::isnan(
absolute_orientation_sensor_.reading.orientation_euler.z.value());
data->has_beta = !std::isnan(
absolute_orientation_sensor_.reading.orientation_euler.x.value());
data->has_gamma = !std::isnan(
absolute_orientation_sensor_.reading.orientation_euler.y.value());
data->absolute = true;
} else {
data->absolute = absolute_;
}
}
bool DeviceOrientationEventPump::ShouldFireEvent(
const device::OrientationData& data) const {
if (!data.all_available_sensors_are_active)
return false;
if (!data.has_alpha && !data.has_beta && !data.has_gamma) {
// no data can be provided, this is an all-null event.
return true;
}
return IsSignificantlyDifferent(data_, data);
}
} // namespace content
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