Implement gfx::Transform StructTraits

ui/gfx/mojo/transform_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 UI_GFX_IPC_TRANSFORM_STRUCT_TRAITS_H_
+#define UI_GFX_IPC_TRANSFORM_STRUCT_TRAITS_H_
+
+#include "ui/gfx/mojo/transform.mojom.h"
+#include "ui/gfx/transform.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<gfx::mojom::Transform, gfx::Transform> {
+  static mojo::Array<float> matrix(const gfx::Transform& transform) {
+    std::vector<float> storage(16);
+    transform.matrix().asRowMajorf(&storage[0]);
+    mojo::Array<float> matrix;
+    matrix.Swap(&storage);
+    return matrix;
+  }
+
+  static bool Read(gfx::mojom::TransformDataView data, gfx::Transform* out) {
+    mojo::Array<float> matrix;
+    if (!data.ReadMatrix(&matrix))
+      return false;
+    out->matrix().setRowMajorf(&matrix.storage()[0]);
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // UI_GFX_IPC_TRANSFORM_STRUCT_TRAITS_H_