Geometry: Reimplement DOMPoint using V8 extras.

third_party/WebKit/Source/modules/vr/VRPositionState.cpp

 // 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 "modules/vr/VRPositionState.h"
 
+#include "bindings/core/v8/GeometryInterfaces.h"
+
 namespace blink {
 
 namespace {
 
-DOMPoint* vecToDomPoint(const WebVRVector4& vec, bool valid)
+void vecToDomPoint(ScriptValue& value, const WebVRVector4& vec, bool valid)
 {
     if (valid)
-        return DOMPoint::create(vec.x, vec.y, vec.z, vec.w);
-    return nullptr;
+        value = GeometryInterfaces::createDOMPoint(vec.x, vec.y, vec.z, vec.w);
+    value = ScriptValue::createNull(ScriptState::current(v8::Isolate::GetCurrent()));

[haraken, 2016/02/25 11:21:11]

Please don't use ScriptState::current without understanding what you're doing :)

You need to pass the ScriptState from V8 bindings (by adding
[CallWith=ScriptState]) down to this method.

 }
-DOMPoint* vecToDomPoint(const WebVRVector3& vec, bool valid)
+
+void vecToDomPoint(ScriptValue& value, const WebVRVector3& vec, bool valid)
 {
     if (valid)
-        return DOMPoint::create(vec.x, vec.y, vec.z, 1.0);
-    return nullptr;
+        value = GeometryInterfaces::createDOMPoint(vec.x, vec.y, vec.z, 1.0);
+    value = ScriptValue::createNull(ScriptState::current(v8::Isolate::GetCurrent()));
 }
 
 } // namespace
 
 VRPositionState::VRPositionState()
     : m_timeStamp(0.0)
 {
 }
 
 void VRPositionState::setState(const WebHMDSensorState &state)
 {
     m_timeStamp = state.timestamp;
-    m_orientation = vecToDomPoint(state.orientation, state.flags & WebVRSensorStateOrientation);
-    m_position = vecToDomPoint(state.position, state.flags & WebVRSensorStatePosition);
-    m_angularVelocity = vecToDomPoint(state.angularVelocity, state.flags & WebVRSensorStateAngularVelocity);
-    m_linearVelocity = vecToDomPoint(state.linearVelocity, state.flags & WebVRSensorStateLinearVelocity);
-    m_angularAcceleration = vecToDomPoint(state.angularAcceleration, state.flags & WebVRSensorStateAngularAcceleration);
-    m_linearAcceleration =  vecToDomPoint(state.linearAcceleration, state.flags & WebVRSensorStateLinearAcceleration);
+    vecToDomPoint(m_orientation, state.orientation, state.flags & WebVRSensorStateOrientation);

[domenic, 2016/02/24 21:23:04]

Is using references in this way OK according to Blink style? I am not sure
myself; maybe haraken@ or philipj@ can comment.

+    vecToDomPoint(m_position, state.position, state.flags & WebVRSensorStatePosition);
+    vecToDomPoint(m_angularVelocity, state.angularVelocity, state.flags & WebVRSensorStateAngularVelocity);
+    vecToDomPoint(m_linearVelocity, state.linearVelocity, state.flags & WebVRSensorStateLinearVelocity);
+    vecToDomPoint(m_angularAcceleration, state.angularAcceleration, state.flags & WebVRSensorStateAngularAcceleration);
+    vecToDomPoint(m_linearAcceleration, state.linearAcceleration, state.flags & WebVRSensorStateLinearAcceleration);
 }
 
 DEFINE_TRACE(VRPositionState)
 {
-    visitor->trace(m_orientation);
-    visitor->trace(m_position);
-    visitor->trace(m_angularVelocity);
-    visitor->trace(m_linearVelocity);
-    visitor->trace(m_angularAcceleration);
-    visitor->trace(m_linearAcceleration);
 }
 
 } // namespace blink