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diff --git a/core/fpdfapi/page/cpdf_function.h b/core/fpdfapi/page/cpdf_function.h
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+++ b/core/fpdfapi/page/cpdf_function.h
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+// 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_FUNCTION_H_
+#define CORE_FPDFAPI_PAGE_CPDF_FUNCTION_H_
+
+#include <memory>
+
+class CPDF_ExpIntFunc;
+class CPDF_Object;
+class CPDF_SampledFunc;
+class CPDF_StitchFunc;
+
+class CPDF_Function {
+ public:
+  enum class Type {
+    kTypeInvalid = -1,
+    kType0Sampled = 0,
+    kType2ExpotentialInterpolation = 2,
+    kType3Stitching = 3,
+    kType4PostScript = 4,
+  };
+
+  static std::unique_ptr<CPDF_Function> Load(CPDF_Object* pFuncObj);
+  static Type IntegerToFunctionType(int iType);
+
+  virtual ~CPDF_Function();
+
+  bool Call(float* inputs,
+            uint32_t ninputs,
+            float* results,
+            int* nresults) const;
+  uint32_t CountInputs() const { return m_nInputs; }
+  uint32_t CountOutputs() const { return m_nOutputs; }
+  float GetDomain(int i) const { return m_pDomains[i]; }
+  float GetRange(int i) const { return m_pRanges[i]; }
+  float Interpolate(float x,
+                    float xmin,
+                    float xmax,
+                    float ymin,
+                    float ymax) const;
+
+  const CPDF_SampledFunc* ToSampledFunc() const;
+  const CPDF_ExpIntFunc* ToExpIntFunc() const;
+  const CPDF_StitchFunc* ToStitchFunc() const;
+
+ protected:
+  explicit CPDF_Function(Type type);
+
+  bool Init(CPDF_Object* pObj);
+  virtual bool v_Init(CPDF_Object* pObj) = 0;
+  virtual bool v_Call(float* inputs, float* results) const = 0;
+
+  uint32_t m_nInputs;
+  uint32_t m_nOutputs;
+  float* m_pDomains;
+  float* m_pRanges;
+  const Type m_Type;
+};
+
+#endif  // CORE_FPDFAPI_PAGE_CPDF_FUNCTION_H_