1 files changed, 51 insertions, 0 deletions
diff --git a/gfx/layers/d3d11/DiagnosticsD3D11.h b/gfx/layers/d3d11/DiagnosticsD3D11.h
new file mode 100644
index 0000000000..c4e2226a62
--- /dev/null
+++ b/gfx/layers/d3d11/DiagnosticsD3D11.h
@@ -0,0 +1,51 @@
+/* -*- 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_gfx_layers_d3d11_DiagnosticsD3D11_h
+#define mozilla_gfx_layers_d3d11_DiagnosticsD3D11_h
+
+#include <stdint.h>
+#include "mozilla/RefPtr.h"
+#include <d3d11.h>
+
+namespace mozilla {
+namespace layers {
+
+struct GPUStats;
+
+class DiagnosticsD3D11 {
+ public:
+  DiagnosticsD3D11(ID3D11Device* aDevice, ID3D11DeviceContext* aContext);
+
+  void Start(uint32_t aPixelsPerFrame);
+  void End();
+  void Cancel();
+
+  void Query(GPUStats* aStats);
+
+ private:
+  RefPtr<ID3D11Device> mDevice;
+  RefPtr<ID3D11DeviceContext> mContext;
+
+  // When using the diagnostic overlay, we double-buffer some queries for
+  // frame statistics.
+  struct FrameQueries {
+    FrameQueries() : pixelsPerFrame(0) {}
+
+    RefPtr<ID3D11Query> stats;
+    RefPtr<ID3D11Query> timing;
+    RefPtr<ID3D11Query> frameBegin;
+    RefPtr<ID3D11Query> frameEnd;
+    uint32_t pixelsPerFrame;
+  };
+  FrameQueries mPrevFrame;
+  FrameQueries mCurrentFrame;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // mozilla_gfx_layers_d3d11_DiagnosticsD3D11_h