[Device Service] Move Gamepad Blink headers to be part of the Gamepad client library

device/gamepad/public/cpp/gamepad.h

+// 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.
+
+#ifndef DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPAD_H_
+#define DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPAD_H_
+
+#include <stddef.h>
+
+namespace device {
+
+#pragma pack(push, 4)
+
+class GamepadButton {
+ public:
+  GamepadButton() : pressed(false), touched(false), value(0.) {}
+  GamepadButton(bool pressed, bool touched, double value)
+      : pressed(pressed), touched(touched), value(value) {}
+  bool pressed;
+  bool touched;
+  double value;
+};
+
+class GamepadVector {
+ public:
+  GamepadVector() : not_null(false) {}
+
+  bool not_null;
+  float x, y, z;
+};
+
+class GamepadQuaternion {
+ public:
+  GamepadQuaternion() : not_null(false) {}
+
+  bool not_null;
+  float x, y, z, w;
+};
+
+class GamepadPose {
+ public:
+  GamepadPose() : not_null(false) {}
+
+  bool not_null;
+
+  bool has_orientation;
+  bool has_position;
+
+  GamepadQuaternion orientation;
+  GamepadVector position;
+  GamepadVector angular_velocity;
+  GamepadVector linear_velocity;
+  GamepadVector angular_acceleration;
+  GamepadVector linear_acceleration;
+};
+
+enum GamepadHand {

[dcheng, 2017/04/12 23:33:27]

Consider making this scoped, since it looks like all the references already
fully qualify the name when they reference enumerator values.

(That would also allow the enumerator names to be shortened to kNone, kLeft,
kRight. A followup would be fine)

[juncai, 2017/04/13 23:55:52]

Done.

+  kGamepadHandNone = 0,
+  kGamepadHandLeft = 1,
+  kGamepadHandRight = 2
+};
+
+// UTF-16 character type
+#if defined(WIN32)
+typedef wchar_t UChar;

[dcheng, 2017/04/12 23:33:27]

Oh... I see.
Nit: prefer using over typedef

[juncai, 2017/04/13 23:55:52]

Done.

+#else
+typedef unsigned short UChar;
+#endif
+
+// This structure is intentionally POD and fixed size so that it can be shared
+// memory between hardware polling threads and the rest of the browser. See
+// also gamepads.h.
+class Gamepad {
+ public:
+  static const size_t kIdLengthCap = 128;
+  static const size_t kMappingLengthCap = 16;
+  static const size_t kAxesLengthCap = 16;
+  static const size_t kButtonsLengthCap = 32;
+
+  Gamepad();
+  Gamepad(const Gamepad& other);
+
+  // Is there a gamepad connected at this index?
+  bool connected;
+
+  // Device identifier (based on manufacturer, model, etc.).
+  UChar id[kIdLengthCap];
+
+  // Monotonically increasing value referring to when the data were last
+  // updated.
+  unsigned long long timestamp;
+
+  // Number of valid entries in the axes array.
+  unsigned axes_length;
+
+  // Normalized values representing axes, in the range [-1..1].
+  double axes[kAxesLengthCap];
+
+  // Number of valid entries in the buttons array.
+  unsigned buttons_length;
+
+  // Button states
+  GamepadButton buttons[kButtonsLengthCap];
+
+  // Mapping type (for example "standard")
+  UChar mapping[kMappingLengthCap];
+
+  GamepadPose pose;
+
+  GamepadHand hand;
+
+  unsigned display_id;
+};
+
+#pragma pack(pop)
+
+}  // namespace device
+
+#endif  // DEVICE_GAMEPAD_PUBLIC_CPP_GAMEPAD_H_