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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 "data_fetcher_shared_memory.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
namespace {
static bool SetMotionBuffer(content::DeviceMotionHardwareBuffer* buffer,
bool enabled) {
if (!buffer)
return false;
buffer->seqlock.WriteBegin();
buffer->data.allAvailableSensorsAreActive = enabled;
buffer->seqlock.WriteEnd();
return true;
}
static bool SetOrientationBuffer(
content::DeviceOrientationHardwareBuffer* buffer, bool enabled) {
if (!buffer)
return false;
buffer->seqlock.WriteBegin();
buffer->data.allAvailableSensorsAreActive = enabled;
buffer->seqlock.WriteEnd();
return true;
}
static bool SetLightBuffer(content::DeviceLightHardwareBuffer* buffer,
double lux) {
if (!buffer)
return false;
buffer->seqlock.WriteBegin();
buffer->data.value = lux;
buffer->seqlock.WriteEnd();
return true;
}
} // namespace
namespace content {
DataFetcherSharedMemory::DataFetcherSharedMemory()
: motion_buffer_(NULL), orientation_buffer_(NULL), light_buffer_(NULL) {
}
DataFetcherSharedMemory::~DataFetcherSharedMemory() {
}
bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
DCHECK(buffer);
switch (consumer_type) {
case CONSUMER_TYPE_MOTION:
motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer);
UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionDefaultAvailable", false);
return SetMotionBuffer(motion_buffer_, true);
case CONSUMER_TYPE_ORIENTATION:
orientation_buffer_ =
static_cast<DeviceOrientationHardwareBuffer*>(buffer);
UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationDefaultAvailable",
false);
return SetOrientationBuffer(orientation_buffer_, true);
case CONSUMER_TYPE_LIGHT:
light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer);
return SetLightBuffer(light_buffer_,
std::numeric_limits<double>::infinity());
default:
NOTREACHED();
}
return false;
}
bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
switch (consumer_type) {
case CONSUMER_TYPE_MOTION:
return SetMotionBuffer(motion_buffer_, false);
case CONSUMER_TYPE_ORIENTATION:
return SetOrientationBuffer(orientation_buffer_, false);
case CONSUMER_TYPE_LIGHT:
return SetLightBuffer(light_buffer_, -1);
default:
NOTREACHED();
}
return false;
}
} // namespace content
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