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diff --git a/core/fpdfapi/page/cpdf_sampledfunc.h b/core/fpdfapi/page/cpdf_sampledfunc.h
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+++ b/core/fpdfapi/page/cpdf_sampledfunc.h
@@ -0,0 +1,52 @@
+// 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_FPDFAPI_PAGE_CPDF_SAMPLEDFUNC_H_
+#define CORE_FPDFAPI_PAGE_CPDF_SAMPLEDFUNC_H_
+
+#include <vector>
+
+#include "core/fpdfapi/page/cpdf_function.h"
+#include "core/fpdfapi/parser/cpdf_stream_acc.h"
+#include "core/fxcrt/cfx_retain_ptr.h"
+
+class CPDF_SampledFunc : public CPDF_Function {
+ public:
+  struct SampleEncodeInfo {
+    float encode_max;
+    float encode_min;
+    uint32_t sizes;
+  };
+
+  struct SampleDecodeInfo {
+    float decode_max;
+    float decode_min;
+  };
+
+  CPDF_SampledFunc();
+  ~CPDF_SampledFunc() override;
+
+  // CPDF_Function
+  bool v_Init(CPDF_Object* pObj) override;
+  bool v_Call(float* inputs, float* results) const override;
+
+  const std::vector<SampleEncodeInfo>& GetEncodeInfo() const {
+    return m_EncodeInfo;
+  }
+  uint32_t GetBitsPerSample() const { return m_nBitsPerSample; }
+  CFX_RetainPtr<CPDF_StreamAcc> GetSampleStream() const {
+    return m_pSampleStream;
+  }
+
+ private:
+  std::vector<SampleEncodeInfo> m_EncodeInfo;
+  std::vector<SampleDecodeInfo> m_DecodeInfo;
+  uint32_t m_nBitsPerSample;
+  uint32_t m_SampleMax;
+  CFX_RetainPtr<CPDF_StreamAcc> m_pSampleStream;
+};
+
+#endif  // CORE_FPDFAPI_PAGE_CPDF_SAMPLEDFUNC_H_