1 // Copyright 2017 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6 
7 #ifndef CORE_FPDFAPI_PAGE_CPDF_FUNCTION_H_
8 #define CORE_FPDFAPI_PAGE_CPDF_FUNCTION_H_
9 
10 #include <memory>
11 #include <set>
12 #include <vector>
13 
14 class CPDF_ExpIntFunc;
15 class CPDF_Object;
16 class CPDF_SampledFunc;
17 class CPDF_StitchFunc;
18 
19 class CPDF_Function {
20  public:
21   enum class Type {
22     kTypeInvalid = -1,
23     kType0Sampled = 0,
24     kType2ExpotentialInterpolation = 2,
25     kType3Stitching = 3,
26     kType4PostScript = 4,
27   };
28 
29   static std::unique_ptr<CPDF_Function> Load(const CPDF_Object* pFuncObj);
30   static Type IntegerToFunctionType(int iType);
31 
32   virtual ~CPDF_Function();
33 
34   bool Call(const float* inputs,
35             uint32_t ninputs,
36             float* results,
37             int* nresults) const;
CountInputs()38   uint32_t CountInputs() const { return m_nInputs; }
CountOutputs()39   uint32_t CountOutputs() const { return m_nOutputs; }
GetDomain(int i)40   float GetDomain(int i) const { return m_Domains[i]; }
GetRange(int i)41   float GetRange(int i) const { return m_Ranges[i]; }
42   float Interpolate(float x,
43                     float xmin,
44                     float xmax,
45                     float ymin,
46                     float ymax) const;
47 
48   const CPDF_SampledFunc* ToSampledFunc() const;
49   const CPDF_ExpIntFunc* ToExpIntFunc() const;
50   const CPDF_StitchFunc* ToStitchFunc() const;
51 
52  protected:
53   explicit CPDF_Function(Type type);
54 
55   static std::unique_ptr<CPDF_Function> Load(
56       const CPDF_Object* pFuncObj,
57       std::set<const CPDF_Object*>* pVisited);
58   bool Init(const CPDF_Object* pObj, std::set<const CPDF_Object*>* pVisited);
59   virtual bool v_Init(const CPDF_Object* pObj,
60                       std::set<const CPDF_Object*>* pVisited) = 0;
61   virtual bool v_Call(const float* inputs, float* results) const = 0;
62 
63   const Type m_Type;
64   uint32_t m_nInputs;
65   uint32_t m_nOutputs;
66   std::vector<float> m_Domains;
67   std::vector<float> m_Ranges;
68 };
69 
70 #endif  // CORE_FPDFAPI_PAGE_CPDF_FUNCTION_H_
71