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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>
#include <set>
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);
static std::unique_ptr<CPDF_Function> Load(CPDF_Object* pFuncObj,
std::set<CPDF_Object*>* pVisited);
bool Init(CPDF_Object* pObj, std::set<CPDF_Object*>* pVisited);
virtual bool v_Init(CPDF_Object* pObj, std::set<CPDF_Object*>* pVisited) = 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_
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