[Sensors] Implement bindings for AbsoluteOrientationSensor

third_party/WebKit/Source/modules/sensor/OrientationSensor.cpp

+// Copyright 2017 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 "modules/sensor/OrientationSensor.h"
+
+#include "bindings/core/v8/ExceptionState.h"
+
+using device::mojom::blink::SensorType;
+
+namespace blink {
+
+Vector<double> OrientationSensor::quaternion(bool& isNull) const {
+  isNull = !canReturnReadings();

[shalamov, 2017/03/23 08:41:06]

Can we return [SameObject] unless reading is changed? We can compare current
timestamp with timestamp in cached Vector and return new object when they are
different.

[Mikhail, 2017/03/24 14:47:09]

Cached using [CachedAttribute]

+  return isNull ? Vector<double>()
+                : Vector<double>({readingValueUnchecked(3),    // W
+                                  readingValueUnchecked(0),    // Vx
+                                  readingValueUnchecked(1),    // Vy
+                                  readingValueUnchecked(2)});  // Vz
+}
+
+void OrientationSensor::populateMatrix(DOMFloat32Array* buffer,
+                                       ExceptionState& exceptionState) {
+  if (buffer->length() < 16) {
+    exceptionState.throwTypeError(
+        "Target buffer must have minimal size of 16.");
+    return;
+  }
+  if (!isActivated()) {
+    exceptionState.throwDOMException(
+        InvalidStateError, "The Sensor must be in 'connected' state.");
+    return;
+  }
+  if (!canReturnReadings())
+    return;
+
+  float x = readingValueUnchecked(0);
+  float y = readingValueUnchecked(1);
+  float z = readingValueUnchecked(2);
+  float w = readingValueUnchecked(3);
+
+  float* out = buffer->data();
+  out[0] = 1.0 - 2 * (y * y - z * z);
+  out[1] = 2 * (x * y - z * w);
+  out[2] = 2 * (x * z + y * w);
+  out[4] = 2 * (x * y + z * w);
+  out[5] = 1.0 - 2 * (x * x - z * z);
+  out[6] = 2 * (y * z - x * w);
+  out[8] = 2 * (x * z - y * w);
+  out[9] = 2 * (y * z + x * w);
+  out[10] = 1.0 - 2 * (x * x - y * y);
+  out[15] = 1.0;
+}
+
+OrientationSensor::OrientationSensor(ExecutionContext* executionContext,
+                                     const SensorOptions& options,
+                                     ExceptionState& exceptionState,
+                                     device::mojom::blink::SensorType type)
+    : Sensor(executionContext, options, exceptionState, type) {}
+
+DEFINE_TRACE(OrientationSensor) {
+  Sensor::trace(visitor);
+}
+
+}  // namespace blink