1 files changed, 80 insertions, 0 deletions
diff --git a/gfx/layers/composite/FrameUniformityData.h b/gfx/layers/composite/FrameUniformityData.h
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+++ b/gfx/layers/composite/FrameUniformityData.h
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+/* -*- 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/. */
+
+#ifndef mozilla_layers_FrameUniformityData_h_
+#define mozilla_layers_FrameUniformityData_h_
+
+#include "ipc/IPCMessageUtils.h"
+#include "js/TypeDecls.h"
+#include "ipc/IPCMessageUtilsSpecializations.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/gfx/Point.h"
+#include "nsTArray.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() = default;
+
+  gfx::Point GetAverage();
+  gfx::Point GetStdDev();
+  bool Sanitize();
+
+  // 60 fps * 5 seconds worth of data
+  AutoTArray<gfx::Point, 300> mTransforms;
+};
+
+class LayerTransformRecorder {
+ public:
+  LayerTransformRecorder() = default;
+  ~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);
+  using FrameTransformMap =
+      std::map<uintptr_t, mozilla::UniquePtr<LayerTransforms>>;
+  FrameTransformMap 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_