text: // 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
  
  #include "core/fpdfapi/page/cpdf_psfunc.h"
  
  #include "core/fpdfapi/parser/cpdf_stream_acc.h"
  #include "third_party/base/ptr_util.h"
  
  CPDF_PSFunc::CPDF_PSFunc() : CPDF_Function(Type::kType4PostScript) {}
  
  CPDF_PSFunc::~CPDF_PSFunc() {}
  
  bool CPDF_PSFunc::v_Init(const CPDF_Object* pObj,
                           std::set<const CPDF_Object*>* pVisited) {
    auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pObj->AsStream());
    pAcc->LoadAllDataFiltered();
    return m_PS.Parse(pAcc->GetSpan());
  }
  
  bool CPDF_PSFunc::v_Call(const float* inputs, float* results) const {
    CPDF_PSEngine& PS = const_cast<CPDF_PSEngine&>(m_PS);
    PS.Reset();
    for (uint32_t i = 0; i < m_nInputs; i++)
      PS.Push(inputs[i]);
    PS.Execute();
    if (PS.GetStackSize() < m_nOutputs)
      return false;
    for (uint32_t i = 0; i < m_nOutputs; i++)
      results[m_nOutputs - i - 1] = PS.Pop();
    return true;
  }
  