1 files changed, 73 insertions, 0 deletions
diff --git a/gfx/layers/composite/FrameUniformityData.h b/gfx/layers/composite/FrameUniformityData.h
new file mode 100644
index 000000000..3ff1bdc4a
--- /dev/null
+++ b/gfx/layers/composite/FrameUniformityData.h
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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/. */
+
+#ifndef mozilla_layers_FrameUniformityData_h_
+#define mozilla_layers_FrameUniformityData_h_
+
+#include "ipc/IPCMessageUtils.h"
+#include "js/TypeDecls.h"
+#include "mozilla/RefPtr.h"
+
+namespace mozilla {
+namespace layers {
+class Layer;
+
+class FrameUniformityData {
+  friend struct IPC::ParamTraits<FrameUniformityData>;
+
+public:
+  bool ToJS(JS::MutableHandleValue aOutValue, JSContext* aContext);
+  // Contains the calculated frame uniformities
+  std::map<uintptr_t,float> mUniformities;
+};
+
+struct LayerTransforms {
+  LayerTransforms() {}
+
+  gfx::Point GetAverage();
+  gfx::Point GetStdDev();
+
+  // 60 fps * 5 seconds worth of data
+  AutoTArray<gfx::Point, 300> mTransforms;
+};
+
+class LayerTransformRecorder {
+public:
+  LayerTransformRecorder() {}
+  ~LayerTransformRecorder();
+
+  void RecordTransform(Layer* aLayer, const gfx::Point& aTransform);
+  void Reset();
+  void EndTest(FrameUniformityData* aOutData);
+
+private:
+  float CalculateFrameUniformity(uintptr_t aLayer);
+  LayerTransforms* GetLayerTransforms(uintptr_t aLayer);
+  std::map<uintptr_t,LayerTransforms*> mFrameTransforms;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+namespace IPC {
+template<>
+struct ParamTraits<mozilla::layers::FrameUniformityData>
+{
+  typedef mozilla::layers::FrameUniformityData paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam)
+  {
+    WriteParam(aMsg, aParam.mUniformities);
+  }
+
+  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
+  {
+    return ParamTraitsStd<std::map<uintptr_t,float>>::Read(aMsg, aIter, &aResult->mUniformities);
+  }
+};
+
+} // namespace IPC
+
+#endif // mozilla_layers_FrameUniformityData_h_