1 files changed, 38 insertions, 0 deletions
diff --git a/gfx/layers/composite/FrameUniformityData.cpp b/gfx/layers/composite/FrameUniformityData.cpp
new file mode 100644
index 0000000000..2589de292e
--- /dev/null
+++ b/gfx/layers/composite/FrameUniformityData.cpp
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FrameUniformityData.h"
+
+#include "mozilla/TimeStamp.h"
+#include "mozilla/dom/APZTestDataBinding.h"
+#include "mozilla/dom/ToJSValue.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace layers {
+
+using namespace gfx;
+
+bool FrameUniformityData::ToJS(JS::MutableHandle<JS::Value> aOutValue,
+                               JSContext* aContext) {
+  dom::FrameUniformityResults results;
+  dom::Sequence<dom::FrameUniformity>& layers =
+      results.mLayerUniformities.Construct();
+
+  for (const auto& [layerAddr, uniformity] : mUniformities) {
+    // FIXME: Make this infallible after bug 968520 is done.
+    MOZ_ALWAYS_TRUE(layers.AppendElement(fallible));
+    dom::FrameUniformity& entry = layers.LastElement();
+
+    entry.mLayerAddress.Construct() = layerAddr;
+    entry.mFrameUniformity.Construct() = uniformity;
+  }
+
+  return dom::ToJSValue(aContext, results, aOutValue);
+}
+
+}  // namespace layers
+}  // namespace mozilla