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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.
#include <memory>
#include <set>
#include <vector>
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/base/span.h"
class CPDF_ExpIntFunc;
class CPDF_Object;
class CPDF_SampledFunc;
class CPDF_StitchFunc;
class CPDF_Function {
// Valid values are from ISO 32000-1:2008 spec, table 38. DO NOT CHANGE.
enum class Type {
kTypeInvalid = -1,
kType0Sampled = 0,
kType2ExponentialInterpolation = 2,
kType3Stitching = 3,
kType4PostScript = 4,
static std::unique_ptr<CPDF_Function> Load(const CPDF_Object* pFuncObj);
virtual ~CPDF_Function();
absl::optional<uint32_t> Call(pdfium::span<const float> inputs,
pdfium::span<float> results) const;
uint32_t CountInputs() const { return m_nInputs; }
uint32_t CountOutputs() const { return m_nOutputs; }
float GetDomain(int i) const { return m_Domains[i]; }
float GetRange(int i) const { return m_Ranges[i]; }
float Interpolate(float x,
float xmin,
float xmax,
float ymin,
float ymax) const;
#if defined(_SKIA_SUPPORT_) || defined(_SKIA_SUPPORT_PATHS_)
const CPDF_SampledFunc* ToSampledFunc() const;
const CPDF_ExpIntFunc* ToExpIntFunc() const;
const CPDF_StitchFunc* ToStitchFunc() const;
#endif // defined(_SKIA_SUPPORT_) || defined(_SKIA_SUPPORT_PATHS_)
explicit CPDF_Function(Type type);
static std::unique_ptr<CPDF_Function> Load(
const CPDF_Object* pFuncObj,
std::set<const CPDF_Object*>* pVisited);
bool Init(const CPDF_Object* pObj, std::set<const CPDF_Object*>* pVisited);
virtual bool v_Init(const CPDF_Object* pObj,
std::set<const CPDF_Object*>* pVisited) = 0;
virtual bool v_Call(pdfium::span<const float> inputs,
pdfium::span<float> results) const = 0;
const Type m_Type;
uint32_t m_nInputs;
uint32_t m_nOutputs;
std::vector<float> m_Domains;
std::vector<float> m_Ranges;