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diff --git a/core/fpdfapi/render/cpdf_scaledrenderbuffer.h b/core/fpdfapi/render/cpdf_scaledrenderbuffer.h
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+++ b/core/fpdfapi/render/cpdf_scaledrenderbuffer.h
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+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FPDFAPI_RENDER_CPDF_SCALEDRENDERBUFFER_H_
+#define CORE_FPDFAPI_RENDER_CPDF_SCALEDRENDERBUFFER_H_
+
+#include <memory>
+
+#include "core/fxcrt/fx_coordinates.h"
+#include "core/fxge/cfx_fxgedevice.h"
+
+class CFX_RenderDevice;
+class CPDF_PageObject;
+class CPDF_RenderContext;
+class CPDF_RenderOptions;
+
+class CPDF_ScaledRenderBuffer {
+ public:
+  CPDF_ScaledRenderBuffer();
+  ~CPDF_ScaledRenderBuffer();
+
+  bool Initialize(CPDF_RenderContext* pContext,
+                  CFX_RenderDevice* pDevice,
+                  const FX_RECT& pRect,
+                  const CPDF_PageObject* pObj,
+                  const CPDF_RenderOptions* pOptions,
+                  int max_dpi);
+  CFX_RenderDevice* GetDevice() {
+    return m_pBitmapDevice ? m_pBitmapDevice.get() : m_pDevice;
+  }
+  CFX_Matrix* GetMatrix() { return &m_Matrix; }
+  void OutputToDevice();
+
+ private:
+  CFX_RenderDevice* m_pDevice;
+  CPDF_RenderContext* m_pContext;
+  FX_RECT m_Rect;
+  const CPDF_PageObject* m_pObject;
+  std::unique_ptr<CFX_FxgeDevice> m_pBitmapDevice;
+  CFX_Matrix m_Matrix;
+};
+
+#endif  // CORE_FPDFAPI_RENDER_CPDF_SCALEDRENDERBUFFER_H_