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diff --git a/core/fxge/dib/cfx_filtereddib.h b/core/fxge/dib/cfx_filtereddib.h
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index 0000000000..3a16bb0750
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+++ b/core/fxge/dib/cfx_filtereddib.h
@@ -0,0 +1,50 @@
+// Copyright 2017 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_FXGE_DIB_CFX_FILTEREDDIB_H_
+#define CORE_FXGE_DIB_CFX_FILTEREDDIB_H_
+
+#include <vector>
+
+#include "core/fxcrt/cfx_retain_ptr.h"
+#include "core/fxge/dib/cfx_dibsource.h"
+
+class CFX_FilteredDIB : public CFX_DIBSource {
+ public:
+  template <typename T, typename... Args>
+  friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
+
+  ~CFX_FilteredDIB() override;
+
+  virtual FXDIB_Format GetDestFormat() = 0;
+  virtual uint32_t* GetDestPalette() = 0;
+  virtual void TranslateScanline(const uint8_t* src_buf,
+                                 std::vector<uint8_t>* dest_buf) const = 0;
+  virtual void TranslateDownSamples(uint8_t* dest_buf,
+                                    const uint8_t* src_buf,
+                                    int pixels,
+                                    int Bpp) const = 0;
+
+  void LoadSrc(const CFX_RetainPtr<CFX_DIBSource>& pSrc);
+
+ protected:
+  CFX_FilteredDIB();
+
+  // CFX_DIBSource
+  const uint8_t* GetScanline(int line) const override;
+  void DownSampleScanline(int line,
+                          uint8_t* dest_scan,
+                          int dest_bpp,
+                          int dest_width,
+                          bool bFlipX,
+                          int clip_left,
+                          int clip_width) const override;
+
+  CFX_RetainPtr<CFX_DIBSource> m_pSrc;
+  mutable std::vector<uint8_t> m_Scanline;
+};
+
+#endif  // CORE_FXGE_DIB_CFX_FILTEREDDIB_H_