Add struct_traits and typemap for blink::WebGamepad

device/gamepad/public/interfaces/gamepad_struct_traits.h

+// Copyright 2016 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_INTERFACES_GAMEPAD_STRUCT_TRAITS_H_
+#define DEVICE_GAMEPAD_PUBLIC_INTERFACES_GAMEPAD_STRUCT_TRAITS_H_
+
+#include <stddef.h>
+
+#include "device/gamepad/public/interfaces/gamepad.mojom.h"
+#include "mojo/public/cpp/bindings/array_traits_carray.h"
+#include "mojo/public/cpp/bindings/struct_traits.h"
+#include "third_party/WebKit/public/platform/WebGamepad.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<device::mojom::GamepadQuaternionDataView,
+                    blink::WebGamepadQuaternion> {
+  static bool IsNull(const blink::WebGamepadQuaternion& r) {
+    return !r.notNull;
+  }
+  static void SetToNull(blink::WebGamepadQuaternion* out);
+  static float x(const blink::WebGamepadQuaternion& r) { return r.x; }
+  static float y(const blink::WebGamepadQuaternion& r) { return r.y; }
+  static float z(const blink::WebGamepadQuaternion& r) { return r.z; }
+  static float w(const blink::WebGamepadQuaternion& r) { return r.w; }
+  static bool Read(device::mojom::GamepadQuaternionDataView data,
+                   blink::WebGamepadQuaternion* out);
+};
+
+template <>
+struct StructTraits<device::mojom::GamepadVectorDataView,
+                    blink::WebGamepadVector> {
+  static bool IsNull(const blink::WebGamepadVector& r) { return !r.notNull; }
+  static void SetToNull(blink::WebGamepadVector* out);
+  static float x(const blink::WebGamepadVector& r) { return r.x; }
+  static float y(const blink::WebGamepadVector& r) { return r.y; }
+  static float z(const blink::WebGamepadVector& r) { return r.z; }
+  static bool Read(device::mojom::GamepadVectorDataView data,
+                   blink::WebGamepadVector* out);
+};
+
+template <>
+struct StructTraits<device::mojom::GamepadButtonDataView,
+                    blink::WebGamepadButton> {
+  static bool pressed(const blink::WebGamepadButton& r) { return r.pressed; }
+  static bool touched(const blink::WebGamepadButton& r) { return r.touched; }
+  static double value(const blink::WebGamepadButton& r) { return r.value; }
+  static bool Read(device::mojom::GamepadButtonDataView data,
+                   blink::WebGamepadButton* out);
+};
+
+template <>
+struct StructTraits<device::mojom::GamepadPoseDataView, blink::WebGamepadPose> {
+  static bool IsNull(const blink::WebGamepadPose& r) { return !r.notNull; }
+  static void SetToNull(blink::WebGamepadPose* out);
+  static const blink::WebGamepadQuaternion& orientation(
+      const blink::WebGamepadPose& r) {
+    return r.orientation;
+  }
+  static const blink::WebGamepadVector& position(
+      const blink::WebGamepadPose& r) {
+    return r.position;
+  }
+  static const blink::WebGamepadVector& angular_velocity(
+      const blink::WebGamepadPose& r) {
+    return r.angularVelocity;
+  }
+  static const blink::WebGamepadVector& linear_velocity(
+      const blink::WebGamepadPose& r) {
+    return r.linearVelocity;
+  }
+  static const blink::WebGamepadVector& angular_acceleration(
+      const blink::WebGamepadPose& r) {
+    return r.angularAcceleration;
+  }
+  static const blink::WebGamepadVector& linear_acceleration(
+      const blink::WebGamepadPose& r) {
+    return r.linearAcceleration;
+  }
+  static bool Read(device::mojom::GamepadPoseDataView data,
+                   blink::WebGamepadPose* out);
+};
+
+template <>
+struct EnumTraits<device::mojom::GamepadHand, blink::WebGamepadHand> {
+  static device::mojom::GamepadHand ToMojom(blink::WebGamepadHand input);
+  static bool FromMojom(device::mojom::GamepadHand input,
+                        blink::WebGamepadHand* output);
+};
+
+template <>
+struct StructTraits<device::mojom::GamepadDataView, blink::WebGamepad> {
+  static bool connected(const blink::WebGamepad& r) { return r.connected; }
+  static CArray<uint16_t> id(const blink::WebGamepad& r) {
+    return {
+        blink::WebGamepad::idLengthCap, blink::WebGamepad::idLengthCap,
+        reinterpret_cast<uint16_t*>(const_cast<blink::WebUChar*>(&r.id[0]))};

[yzshen1, 2016/11/15 19:17:33]

You could return a ConstCArray, that way you don't need to do const cast. (Here
and below)

[ke.he, 2016/11/16 09:51:41]

Done.

+  }
+  static uint64_t timestamp(const blink::WebGamepad& r) { return r.timestamp; }
+  static uint32_t axes_length(const blink::WebGamepad& r) {
+    return r.axesLength;
+  }
+  static CArray<double> axes(const blink::WebGamepad& r) {
+    return {blink::WebGamepad::axesLengthCap, blink::WebGamepad::axesLengthCap,
+            const_cast<double*>(&r.axes[0])};
+  }
+  static uint32_t buttons_length(const blink::WebGamepad& r) {
+    return r.buttonsLength;
+  }
+  static CArray<blink::WebGamepadButton> buttons(const blink::WebGamepad& r) {
+    return {blink::WebGamepad::buttonsLengthCap,
+            blink::WebGamepad::buttonsLengthCap,
+            const_cast<blink::WebGamepadButton*>(&r.buttons[0])};
+  }
+  static CArray<uint16_t> mapping(const blink::WebGamepad& r) {
+    return {blink::WebGamepad::mappingLengthCap,
+            blink::WebGamepad::mappingLengthCap,
+            reinterpret_cast<uint16_t*>(
+                const_cast<blink::WebUChar*>(&r.mapping[0]))};
+  }
+  static const blink::WebGamepadPose& pose(const blink::WebGamepad& r) {
+    return r.pose;
+  }
+  static const blink::WebGamepadHand& hand(const blink::WebGamepad& r) {
+    return r.hand;
+  }
+  static uint32_t display_id(const blink::WebGamepad& r) { return r.displayId; }
+  static bool Read(device::mojom::GamepadDataView data, blink::WebGamepad* out);
+};
+
+}  // namespace mojo
+
+#endif  // DEVICE_GAMEPAD_PUBLIC_INTERFACES_GAMEPAD_STRUCT_TRAITS_H_