Move appcache/file_sytem/device_orientation subdirectories of chrome\browser ...

chrome/browser/device_orientation/accelerometer_mac.cc

-// Copyright (c) 2011 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.
-//
-// This file is based on the SMSLib library.
-//
-// SMSLib Sudden Motion Sensor Access Library
-// Copyright (c) 2010 Suitable Systems
-// All rights reserved.
-//
-// Developed by: Daniel Griscom
-//               Suitable Systems
-//               http://www.suitable.com
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal with the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to
-// permit persons to whom the Software is furnished to do so, subject to
-// the following conditions:
-//
-// - Redistributions of source code must retain the above copyright notice,
-// this list of conditions and the following disclaimers.
-//
-// - Redistributions in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimers in the
-// documentation and/or other materials provided with the distribution.
-//
-// - Neither the names of Suitable Systems nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this Software without specific prior written permission.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-// IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR
-// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-// SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
-//
-// For more information about SMSLib, see
-//    <http://www.suitable.com/tools/smslib.html>
-// or contact
-//    Daniel Griscom
-//    Suitable Systems
-//    1 Centre Street, Suite 204
-//    Wakefield, MA 01880
-//    (781) 665-0053
-
-#include "chrome/browser/device_orientation/accelerometer_mac.h"
-
-#include <math.h>
-#include <sys/sysctl.h>
-
-#include "base/logging.h"
-#include "base/scoped_ptr.h"
-#include "chrome/browser/device_orientation/orientation.h"
-
-namespace device_orientation {
-
-struct AccelerometerMac::GenericMacbookSensor {
-  // Name of device to be read.
-  const char* service_name;
-
-  // Number of bytes of the axis data.
-  int axis_size;
-
-  // Default calibration value for zero g.
-  float zero_g;
-
-  // Default calibration value for one g (negative when axis is inverted).
-  float one_g;
-
-  // Kernel function index.
-  unsigned int function;
-
-  // Size of the sensor record to be sent/received.
-  unsigned int record_size;
-};
-
-struct AccelerometerMac::AxisData {
-  // Location of the first byte representing the axis in the sensor data.
-  int index;
-
-  // Axis inversion flag. The value changes often between models.
-  bool inverted;
-};
-
-// Sudden Motion Sensor descriptor.
-struct AccelerometerMac::SensorDescriptor {
-  // Prefix of model to be tested.
-  const char* model_name;
-
-  // Axis-specific data (x,y,z order).
-  AxisData axis[3];
-};
-
-// Typical sensor parameters in MacBook models.
-const AccelerometerMac::GenericMacbookSensor
-  AccelerometerMac::kGenericSensor = {
-  "SMCMotionSensor", 2,
-  0, 251,
-  5, 40
-};
-
-// Supported sensor descriptors. Add entries here to enhance compatibility.
-// All non-tested entries from SMSLib have been removed.
-const AccelerometerMac::SensorDescriptor
-    AccelerometerMac::kSupportedSensors[] = {
-  // Tested by tommyw on a 13" MacBook.
-  { "MacBook1,1",    { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by S.Selz. (via avi) on a 13" MacBook.
-  { "MacBook2,1",    { { 0, true  }, { 2, false }, { 4, true  } } },
-
-  // Tested by verhees on a 13" MacBook.
-  { "MacBook3,1",    { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by adlr on a 13" MacBook.
-  { "MacBook4,1",    { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by tommyw on a 13" MacBook.
-  { "MacBook6,1",    { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by avi on a 13" MacBook.
-  { "MacBook7,1",    { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by crc on a 13" MacBook Air.
-  { "MacBookAir1,1", { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by sfiera, pjw on a 13" MacBook Air.
-  { "MacBookAir2,1", { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Note: MacBookAir3,1 (11" MacBook Air) and MacBookAir3,2 (13" MacBook Air)
-  // have no accelerometer sensors.
-
-  // Tested by crc on a 15" MacBook Pro.
-  { "MacBookPro1,1", { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by L.V. (via avi) on a 17" MacBook Pro.
-  { "MacBookPro2,1", { { 0, true  }, { 2, false }, { 4, true  } } },
-
-  // Tested by leandrogracia on a 15" MacBook Pro.
-  { "MacBookPro2,2", { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by leandrogracia on a 15" MacBook Pro.
-  // TODO(avi): this model name was also used for the 17" version; verify that
-  // these parameters are also valid for that model.
-  { "MacBookPro3,1", { { 0, false }, { 2, true  }, { 4, true  } } },
-
-  // Tested by leandrogracia on a 15" MacBook Pro.
-  // Tested by Eric Shapiro (via avi) on a 17" MacBook Pro.
-  { "MacBookPro4,1", { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by leandrogracia on a 15" MacBook Pro.
-  { "MacBookPro5,1", { { 0, false }, { 2, false }, { 4, false } } },
-
-  // Tested by S.Selz. (via avi) on a 17" MacBook Pro.
-  { "MacBookPro5,2", { { 0, false }, { 2, false }, { 4, false } } },
-
-  // Tested by dmaclach on a 15" MacBook Pro.
-  { "MacBookPro5,3", { { 2, false }, { 0, false }, { 4, true  } } },
-
-  // Tested by leandrogracia on a 15" MacBook Pro.
-  { "MacBookPro5,4", { { 0, false }, { 2, false }, { 4, false } } },
-
-  // Tested by leandrogracia on a 13" MacBook Pro.
-  { "MacBookPro5,5", { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Tested by khom, leadpipe on a 17" MacBook Pro.
-  { "MacBookPro6,1", { { 0, false }, { 2, false }, { 4, false } } },
-
-  // Tested by leandrogracia on a 15" MacBook Pro.
-  { "MacBookPro6,2", { { 0, true  }, { 2, false }, { 4, true  } } },
-
-  // Tested by leandrogracia on a 13" MacBook Pro.
-  { "MacBookPro7,1", { { 0, true  }, { 2, true  }, { 4, false } } },
-
-  // Generic MacBook accelerometer sensor data, used for for both future models
-  // and past models for which there has been no testing. Note that this generic
-  // configuration may well have problems with inverted axes.
-  // TODO(avi): Find these past models and test on them; test on future models.
-  //  MacBook5,1
-  //  MacBook5,2
-  //  MacBookPro1,2
-  //  MacBookPro3,1 (17" to compare to 15")
-  { "", { { 0, true  }, { 2, true  }, { 4, false } } }
-};
-
-// Create a AccelerometerMac object and return NULL if no valid sensor found.
-DataFetcher* AccelerometerMac::Create() {
-  scoped_ptr<AccelerometerMac> accelerometer(new AccelerometerMac);
-  return accelerometer->Init() ? accelerometer.release() : NULL;
-}
-
-AccelerometerMac::~AccelerometerMac() {
-  IOServiceClose(io_connection_);
-}
-
-AccelerometerMac::AccelerometerMac()
-    : sensor_(NULL),
-      io_connection_(0) {
-}
-
-//  Retrieve per-axis accelerometer values.
-//
-//  Axes and angles are defined according to the W3C DeviceOrientation Draft.
-//  See here: http://dev.w3.org/geo/api/spec-source-orientation.html
-//
-//  Note: only beta and gamma angles are provided. Alpha is set to zero.
-//
-//  Returns false in case of error or non-properly initialized object.
-//
-bool AccelerometerMac::GetOrientation(Orientation* orientation) {
-  DCHECK(sensor_);
-
-  // Reset output record memory buffer.
-  std::fill(output_record_.begin(), output_record_.end(), 0x00);
-
-  // Read record data from memory.
-  const size_t kInputSize = kGenericSensor.record_size;
-  size_t output_size = kGenericSensor.record_size;
-
-  if (IOConnectCallStructMethod(io_connection_, kGenericSensor.function,
-      static_cast<const char *>(&input_record_[0]), kInputSize,
-      &output_record_[0], &output_size) != KERN_SUCCESS) {
-    return false;
-  }
-
-  // Calculate per-axis calibrated values.
-  float axis_value[3];
-
-  for (int i = 0; i < 3; ++i) {
-    int sensor_value = 0;
-    int size  = kGenericSensor.axis_size;
-    int index = sensor_->axis[i].index;
-
-    // Important Note: Little endian is assumed as this code is Mac-only
-    //                 and PowerPC is currently not supported.
-    memcpy(&sensor_value, &output_record_[index], size);
-
-    sensor_value = ExtendSign(sensor_value, size);
-
-    // Correct value using the current calibration.
-    axis_value[i] = static_cast<float>(sensor_value - kGenericSensor.zero_g) /
-                    kGenericSensor.one_g;
-
-    // Make sure we reject any NaN or infinite values.
-    if (!isfinite(axis_value[i]))
-      return false;
-
-    // Clamp value to the [-1, 1] range.
-    if (axis_value[i] < -1.0)
-      axis_value[i] = -1.0;
-    else if (axis_value[i] > 1.0)
-      axis_value[i] = 1.0;
-
-    // Apply axis inversion.
-    if (sensor_->axis[i].inverted)
-      axis_value[i] = -axis_value[i];
-  }
-
-  // Transform the accelerometer values to W3C draft angles.
-  //
-  // Accelerometer values are just dot products of the sensor axes
-  // by the gravity vector 'g' with the result for the z axis inverted.
-  //
-  // To understand this transformation calculate the 3rd row of the z-x-y
-  // Euler angles rotation matrix (because of the 'g' vector, only 3rd row
-  // affects to the result). Note that z-x-y matrix means R = Ry * Rx * Rz.
-  // Then, assume alpha = 0 and you get this:
-  //
-  // x_acc = sin(gamma)
-  // y_acc = - cos(gamma) * sin(beta)
-  // z_acc = cos(beta) * cos(gamma)
-  //
-  // After that the rest is just a bit of trigonometry.
-  //
-  // Also note that alpha can't be provided but it's assumed to be always zero.
-  // This is necessary in order to provide enough information to solve
-  // the equations.
-  //
-  const double kRad2deg = 180.0 / M_PI;
-
-  orientation->alpha_ = 0.0;
-  orientation->beta_  = kRad2deg * atan2(-axis_value[1], axis_value[2]);
-  orientation->gamma_ = kRad2deg * asin(axis_value[0]);
-
-  // Make sure that the interval boundaries comply with the specification. At
-  // this point, beta is [-180, 180] and gamma is [-90, 90], but the spec has
-  // the upper bound open on both.
-  if (orientation->beta_ == 180.0) {
-    orientation->beta_ = -180.0;  // -180 == 180 (upside-down)
-  }
-  if (orientation->gamma_ == 90.0) {
-    static double just_less_than_90 = nextafter(90, 0);
-    orientation->gamma_ = just_less_than_90;
-  }
-
-  // At this point, DCHECKing is paranoia. Never hurts.
-  DCHECK_GE(orientation->beta_, -180.0);
-  DCHECK_LT(orientation->beta_,  180.0);
-  DCHECK_GE(orientation->gamma_, -90.0);
-  DCHECK_LT(orientation->gamma_,  90.0);
-
-  orientation->can_provide_alpha_ = false;
-  orientation->can_provide_beta_  = true;
-  orientation->can_provide_gamma_ = true;
-
-  return true;
-}
-
-// Probe the local hardware looking for a supported sensor device
-// and initialize an I/O connection to it.
-bool AccelerometerMac::Init() {
-  // Allocate local variables for model name string (size from SMSLib).
-  static const int kNameSize = 32;
-  char local_model[kNameSize];
-
-  // Request model name to the kernel.
-  size_t name_size = kNameSize;
-  int params[2] = { CTL_HW, HW_MODEL };
-  if (sysctl(params, 2, local_model, &name_size, NULL, 0) != 0)
-    return NULL;
-
-  const SensorDescriptor* sensor_candidate = NULL;
-
-  // Look for the current model in the supported sensor list.
-  const int kNumSensors = arraysize(kSupportedSensors);
-
-  for (int i = 0; i < kNumSensors; ++i) {
-    // Check if the supported sensor model name is a prefix
-    // of the local hardware model (empty names are accepted).
-    const char* p1 = kSupportedSensors[i].model_name;
-    for (const char* p2 = local_model; *p1 != '\0' && *p1 == *p2; ++p1, ++p2)
-      continue;
-    if (*p1 != '\0')
-      continue;
-
-    // Local hardware found in the supported sensor list.
-    sensor_candidate = &kSupportedSensors[i];
-
-    // Get a dictionary of the services matching to the one in the sensor.
-    CFMutableDictionaryRef dict =
-        IOServiceMatching(kGenericSensor.service_name);
-    if (dict == NULL)
-      continue;
-
-    // Get an iterator for the matching services.
-    io_iterator_t device_iterator;
-    if (IOServiceGetMatchingServices(kIOMasterPortDefault, dict,
-        &device_iterator) != KERN_SUCCESS) {
-      continue;
-    }
-
-    // Get the first device in the list.
-    io_object_t device = IOIteratorNext(device_iterator);
-    IOObjectRelease(device_iterator);
-    if (device == 0)
-      continue;
-
-    // Try to open device.
-    kern_return_t result;
-    result = IOServiceOpen(device, mach_task_self(), 0, &io_connection_);
-    IOObjectRelease(device);
-    if (result != KERN_SUCCESS || io_connection_ == 0)
-      return false;
-
-    // Local sensor service confirmed by IOKit.
-    sensor_ = sensor_candidate;
-    break;
-  }
-
-  if (sensor_ == NULL)
-    return false;
-
-  // Allocate and initialize input/output records.
-  input_record_.resize(kGenericSensor.record_size, 0x01);
-  output_record_.resize(kGenericSensor.record_size, 0x00);
-
-  // Try to retrieve the current orientation.
-  Orientation test_orientation;
-  return GetOrientation(&test_orientation);
-}
-
-// Extend the sign of an integer of less than 32 bits to a 32-bit integer.
-int AccelerometerMac::ExtendSign(int value, size_t size) {
-  switch (size) {
-  case 1:
-    if (value & 0x00000080)
-      return value | 0xffffff00;
-    break;
-
-  case 2:
-    if (value & 0x00008000)
-      return value | 0xffff0000;
-    break;
-
-  case 3:
-    if (value & 0x00800000)
-      return value | 0xff000000;
-    break;
-
-  default:
-    LOG(FATAL) << "Invalid integer size for sign extension: " << size;
-  }
-
-  return value;
-}
-
-}  // namespace device_orientation