Device Orientation API on Chrome OS

content/browser/device_sensors/sensor_manager_chromeos_unittest.cc

+// Copyright 2015 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/browser/device_sensors/sensor_manager_chromeos.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "chromeos/accelerometer/accelerometer_types.h"
+#include "content/common/device_sensors/device_orientation_hardware_buffer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+const double kMeanGravity = 9.80665;
+
+// Isolated content::SensorManagerChromeOS from the active
+// chromeos::AccelerometerReader. This allows for direct control over which
+// accelerometer events are provided to the sensor manager.
+class TestSensorManagerChromeOS : public content::SensorManagerChromeOS {
+ public:
+  TestSensorManagerChromeOS() {}
+  ~TestSensorManagerChromeOS() override {};
+
+ protected:
+  void StartObservingAccelerometer() override {}
+  void StopObservingAccelerometer() override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestSensorManagerChromeOS);
+};
+
+}  // namespace
+
+namespace content {
+
+class SensorManagerChromeOSTest : public testing::Test {
+ public:
+  SensorManagerChromeOSTest() {
+    orientation_buffer_.reset(new DeviceOrientationHardwareBuffer);
+  }
+
+  ~SensorManagerChromeOSTest() override {}
+
+  void OnAccelerationIncludingGravity(double x, double y, double z) {
+    chromeos::AccelerometerUpdate update;
+    update.Set(chromeos::ACCELEROMETER_SOURCE_SCREEN, x, y, z);
+    sensor_manager_->OnAccelerometerUpdated(update);
+  }
+
+  DeviceOrientationHardwareBuffer* orientation_buffer() {
+    return orientation_buffer_.get();
+  }
+
+  SensorManagerChromeOS* sensor_manager() { return sensor_manager_.get(); }
+
+  // testing::Test:
+  void SetUp() override {
+    testing::Test::SetUp();
+    sensor_manager_.reset(new TestSensorManagerChromeOS);
+    sensor_manager_->StartFetchingDeviceOrientationData(
+        orientation_buffer_.get());
+  }
+
+  void TearDown() override {
+    sensor_manager_->StopFetchingDeviceOrientationData();
+    testing::Test::TearDown();
+  }
+
+ private:
+  scoped_ptr<TestSensorManagerChromeOS> sensor_manager_;
+
+  scoped_ptr<DeviceOrientationHardwareBuffer> orientation_buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(SensorManagerChromeOSTest);
+};
+
+// Tests that starting to process orientation data will update the associated
+// buffer.
+TEST_F(SensorManagerChromeOSTest, OrientationBuffer) {
+  DeviceOrientationHardwareBuffer* buffer = orientation_buffer();
+  EXPECT_TRUE(buffer->data.hasAbsolute);
+  EXPECT_FALSE(buffer->data.hasAlpha);
+  EXPECT_FALSE(buffer->data.hasBeta);
+  EXPECT_FALSE(buffer->data.hasGamma);
+  EXPECT_FALSE(buffer->data.allAvailableSensorsAreActive);
+
+  OnAccelerationIncludingGravity(0.0f, 0.0f, 1.0f);
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.alpha);
+  EXPECT_FALSE(buffer->data.hasAlpha);
+  EXPECT_TRUE(buffer->data.hasBeta);
+  EXPECT_TRUE(buffer->data.hasGamma);
+  EXPECT_TRUE(buffer->data.allAvailableSensorsAreActive);
+
+  sensor_manager()->StopFetchingDeviceOrientationData();
+  EXPECT_FALSE(buffer->data.allAvailableSensorsAreActive);
+}
+
+// Tests a device resting flat.
+TEST_F(SensorManagerChromeOSTest, NeutralOrientation) {
+  OnAccelerationIncludingGravity(0.0f, 0.0f, -kMeanGravity);
+  DeviceOrientationHardwareBuffer* buffer = orientation_buffer();
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.beta);
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.gamma);
+}
+
+// Tests an upside-down device, such that the W3C boundary [-180,180) causes the
+// beta value to become negative.
+TEST_F(SensorManagerChromeOSTest, UpsideDown) {
+  OnAccelerationIncludingGravity(0.0f, 0.0f, kMeanGravity);
+  DeviceOrientationHardwareBuffer* buffer = orientation_buffer();
+  EXPECT_FLOAT_EQ(-180.0f, buffer->data.beta);
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.gamma);
+}
+
+// Tests for positive beta value before the device is completely upside-down
+TEST_F(SensorManagerChromeOSTest, BeforeUpsideDownBoundary) {
+  OnAccelerationIncludingGravity(0.0f, -kMeanGravity / 2.0f,
+                                 kMeanGravity / 2.0f);
+  DeviceOrientationHardwareBuffer* buffer = orientation_buffer();
+  EXPECT_FLOAT_EQ(135.0f, buffer->data.beta);
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.gamma);
+}
+
+// Tests a device lying on its left-edge.
+TEST_F(SensorManagerChromeOSTest, LeftEdge) {
+  OnAccelerationIncludingGravity(-kMeanGravity, 0.0f, 0.0f);
+  DeviceOrientationHardwareBuffer* buffer = orientation_buffer();
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.beta);
+  EXPECT_FLOAT_EQ(-90.0f, buffer->data.gamma);
+}
+
+// Tests a device lying on its right-edge, such that the W3C boundary [-90,90)
+// causes the gamma value to become negative.
+TEST_F(SensorManagerChromeOSTest, RightEdge) {
+  OnAccelerationIncludingGravity(kMeanGravity, 0.0f, 0.0f);
+  DeviceOrientationHardwareBuffer* buffer = orientation_buffer();
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.beta);
+  EXPECT_FLOAT_EQ(-90.0f, buffer->data.gamma);
+}
+
+// Tests for positive gamma value before the device is completely on its right
+// side.
+TEST_F(SensorManagerChromeOSTest, BeforeRightEdgeBoundary) {
+  OnAccelerationIncludingGravity(kMeanGravity / 2.0f, 0.0f,
+                                 -kMeanGravity / 2.0f);
+  DeviceOrientationHardwareBuffer* buffer = orientation_buffer();
+  EXPECT_FLOAT_EQ(0.0f, buffer->data.beta);
+  EXPECT_FLOAT_EQ(45.0f, buffer->data.gamma);
+}
+
+}  // namespace content