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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 "device_orientation_event_pump.h"
#include <string.h>
#include <cmath>
#include "content/common/device_sensors/device_orientation_messages.h"
#include "content/public/renderer/render_thread.h"
#include "third_party/WebKit/public/platform/modules/device_orientation/WebDeviceOrientationListener.h"
namespace content {
const double DeviceOrientationEventPump::kOrientationThreshold = 0.1;
DeviceOrientationEventPump::DeviceOrientationEventPump(RenderThread* thread)
: DeviceSensorEventPump<blink::WebDeviceOrientationListener>(thread) {
}
DeviceOrientationEventPump::~DeviceOrientationEventPump() {
}
bool DeviceOrientationEventPump::OnControlMessageReceived(
const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(DeviceOrientationEventPump, message)
IPC_MESSAGE_HANDLER(DeviceOrientationMsg_DidStartPolling, OnDidStart)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void DeviceOrientationEventPump::FireEvent() {
DCHECK(listener());
blink::WebDeviceOrientationData data;
if (reader_->GetLatestData(&data) && ShouldFireEvent(data)) {
memcpy(&data_, &data, sizeof(data));
listener()->didChangeDeviceOrientation(data);
}
}
static bool IsSignificantlyDifferent(bool hasAngle1, double angle1,
bool hasAngle2, double angle2) {
if (hasAngle1 != hasAngle2)
return true;
return (hasAngle1 && std::fabs(angle1 - angle2) >=
DeviceOrientationEventPump::kOrientationThreshold);
}
bool DeviceOrientationEventPump::ShouldFireEvent(
const blink::WebDeviceOrientationData& data) const {
if (!data.allAvailableSensorsAreActive)
return false;
if (!data.hasAlpha && !data.hasBeta && !data.hasGamma) {
// no data can be provided, this is an all-null event.
return true;
}
return IsSignificantlyDifferent(
data_.hasAlpha, data_.alpha, data.hasAlpha, data.alpha) ||
IsSignificantlyDifferent(
data_.hasBeta, data_.beta, data.hasBeta, data.beta) ||
IsSignificantlyDifferent(
data_.hasGamma, data_.gamma, data.hasGamma, data.gamma);
}
bool DeviceOrientationEventPump::InitializeReader(
base::SharedMemoryHandle handle) {
memset(&data_, 0, sizeof(data_));
if (!reader_)
reader_.reset(new DeviceOrientationSharedMemoryReader());
return reader_->Initialize(handle);
}
void DeviceOrientationEventPump::SendStartMessage() {
RenderThread::Get()->Send(new DeviceOrientationHostMsg_StartPolling());
}
void DeviceOrientationEventPump::SendStopMessage() {
RenderThread::Get()->Send(new DeviceOrientationHostMsg_StopPolling());
}
void DeviceOrientationEventPump::SendFakeDataForTesting(void* fake_data) {
blink::WebDeviceOrientationData data =
*static_cast<blink::WebDeviceOrientationData*>(fake_data);
listener()->didChangeDeviceOrientation(data);
}
} // namespace content
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