content/browser/device_sensors/data_fetcher_shared_memory_default.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "data_fetcher_shared_memory.h"
   6
   7 #include "base/logging.h"
   8 #include "base/metrics/histogram.h"
   9
  10 namespace {
  11
  12 static bool SetMotionBuffer(content::DeviceMotionHardwareBuffer* buffer,
  13     bool enabled) {
  14   if (!buffer)
  15     return false;
  16   buffer->seqlock.WriteBegin();
  17   buffer->data.allAvailableSensorsAreActive = enabled;
  18   buffer->seqlock.WriteEnd();
  19   return true;
  20 }
  21
  22 static bool SetOrientationBuffer(
  23     content::DeviceOrientationHardwareBuffer* buffer, bool enabled) {
  24   if (!buffer)
  25     return false;
  26   buffer->seqlock.WriteBegin();
  27   buffer->data.allAvailableSensorsAreActive = enabled;
  28   buffer->seqlock.WriteEnd();
  29   return true;
  30 }
  31
  32 }  // namespace
  33
  34 namespace content {
  35
  36 DataFetcherSharedMemory::DataFetcherSharedMemory()
  37     : motion_buffer_(NULL), orientation_buffer_(NULL) {
  38 }
  39
  40 DataFetcherSharedMemory::~DataFetcherSharedMemory() {
  41 }
  42
  43 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
  44   DCHECK(buffer);
  45
  46   switch (consumer_type) {
  47     case CONSUMER_TYPE_MOTION:
  48       motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer);
  49       UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionDefaultAvailable", false);
  50       return SetMotionBuffer(motion_buffer_, true);
  51     case CONSUMER_TYPE_ORIENTATION:
  52       orientation_buffer_ =
  53           static_cast<DeviceOrientationHardwareBuffer*>(buffer);
  54       UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationDefaultAvailable",
  55           false);
  56       return SetOrientationBuffer(orientation_buffer_, true);
  57     default:
  58       NOTREACHED();
  59   }
  60   return false;
  61 }
  62
  63 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
  64   switch (consumer_type) {
  65     case CONSUMER_TYPE_MOTION:
  66       return SetMotionBuffer(motion_buffer_, false);
  67     case CONSUMER_TYPE_ORIENTATION:
  68       return SetOrientationBuffer(orientation_buffer_, false);
  69     default:
  70       NOTREACHED();
  71   }
  72   return false;
  73 }
  74
  75 }  // namespace content