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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_light_event_pump.h"
#include "base/time/time.h"
#include "content/common/device_sensors/device_light_messages.h"
#include "content/public/renderer/render_thread.h"
#include "third_party/WebKit/public/platform/WebDeviceLightListener.h"
namespace {
// Default rate for firing of DeviceLight events.
const int kDefaultLightPumpFrequencyHz = 5;
const int kDefaultLightPumpDelayMicroseconds =
base::Time::kMicrosecondsPerSecond / kDefaultLightPumpFrequencyHz;
} // namespace
namespace content {
DeviceLightEventPump::DeviceLightEventPump(RenderThread* thread)
: DeviceSensorEventPump<blink::WebDeviceLightListener>(thread),
last_seen_data_(-1) {
pump_delay_microseconds_ = kDefaultLightPumpDelayMicroseconds;
}
DeviceLightEventPump::~DeviceLightEventPump() {
}
bool DeviceLightEventPump::OnControlMessageReceived(
const IPC::Message& message) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(DeviceLightEventPump, message)
IPC_MESSAGE_HANDLER(DeviceLightMsg_DidStartPolling, OnDidStart)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void DeviceLightEventPump::FireEvent() {
DCHECK(listener());
DeviceLightData data;
if (reader_->GetLatestData(&data) && ShouldFireEvent(data.value)) {
last_seen_data_ = data.value;
listener()->didChangeDeviceLight(data.value);
}
}
bool DeviceLightEventPump::ShouldFireEvent(double lux) const {
if (lux < 0)
return false;
if (lux == std::numeric_limits<double>::infinity()) {
// no sensor data can be provided, fire an Infinity event to Blink.
return true;
}
return lux != last_seen_data_;
}
bool DeviceLightEventPump::InitializeReader(base::SharedMemoryHandle handle) {
if (!reader_)
reader_.reset(new DeviceLightSharedMemoryReader());
return reader_->Initialize(handle);
}
void DeviceLightEventPump::SendStartMessage() {
RenderThread::Get()->Send(new DeviceLightHostMsg_StartPolling());
}
void DeviceLightEventPump::SendStopMessage() {
last_seen_data_ = -1;
RenderThread::Get()->Send(new DeviceLightHostMsg_StopPolling());
}
void DeviceLightEventPump::SendFakeDataForTesting(void* fake_data) {
double data = *static_cast<double*>(fake_data);
listener()->didChangeDeviceLight(data);
}
} // namespace content
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