Extend the geometry APIs.

mojo/services/geometry/cpp/geometry_util.cc

Index: mojo/services/geometry/cpp/geometry_util.cc
diff --git a/mojo/services/geometry/cpp/geometry_util.cc b/mojo/services/geometry/cpp/geometry_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6aad17503136bd786e9792bba0087ffb2fa06ac5
--- /dev/null
+++ b/mojo/services/geometry/cpp/geometry_util.cc
@@ -0,0 +1,27 @@
+// Copyright 2014 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 <string>

[viettrungluu, 2015/12/11 00:15:13]

You want <string.h> (or <cstring>) for memcpy, not <string>.

[jeffbrown, 2015/12/11 19:40:55]

Done.

+#include "mojo/services/geometry/cpp/geometry_util.h"
+
+namespace mojo {
+
+static float kIdentityMatrix[]{1.f, 0.f, 0.f, 0.f,  // comments to prevent

[abarth-chromium, 2015/12/10 22:49:53]

const ?

[jeffbrown, 2015/12/11 19:40:55]

Done.

+                               0.f, 1.f, 0.f, 0.f,  // auto formatter reflow
+                               0.f, 0.f, 1.f, 0.f,  //
+                               0.f, 0.f, 0.f, 1.f};
+
+void SetIdentityTransform(Transform* transform) {
+  transform->matrix.resize(16u);
+  memcpy(transform->matrix.data(), kIdentityMatrix, sizeof(kIdentityMatrix));
+}
+
+void SetTranslationTransform(Transform* transform, float x, float y, float z) {
+  SetIdentityTransform(transform);
+  transform->matrix[3] = x;
+  transform->matrix[7] = y;
+  transform->matrix[11] = z;
+}
+
+}  // namespace mojo