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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
#include "core/fpdfapi/page/cpdf_stitchfunc.h"
#include <utility>
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fxcrt/fx_memory.h"
CPDF_StitchFunc::CPDF_StitchFunc()
: CPDF_Function(Type::kType3Stitching),
m_pBounds(nullptr),
m_pEncode(nullptr) {}
CPDF_StitchFunc::~CPDF_StitchFunc() {
FX_Free(m_pBounds);
FX_Free(m_pEncode);
}
bool CPDF_StitchFunc::v_Init(CPDF_Object* pObj,
std::set<CPDF_Object*>* pVisited) {
CPDF_Dictionary* pDict = pObj->GetDict();
if (!pDict) {
return false;
}
if (m_nInputs != kRequiredNumInputs) {
return false;
}
CPDF_Array* pArray = pDict->GetArrayFor("Functions");
if (!pArray) {
return false;
}
uint32_t nSubs = pArray->GetCount();
if (nSubs == 0)
return false;
m_nOutputs = 0;
for (uint32_t i = 0; i < nSubs; i++) {
CPDF_Object* pSub = pArray->GetDirectObjectAt(i);
if (pSub == pObj)
return false;
std::unique_ptr<CPDF_Function> pFunc(CPDF_Function::Load(pSub, pVisited));
if (!pFunc)
return false;
// Check that the input dimensionality is 1, and that all output
// dimensionalities are the same.
if (pFunc->CountInputs() != kRequiredNumInputs)
return false;
if (pFunc->CountOutputs() != m_nOutputs) {
if (m_nOutputs)
return false;
m_nOutputs = pFunc->CountOutputs();
}
m_pSubFunctions.push_back(std::move(pFunc));
}
m_pBounds = FX_Alloc(float, nSubs + 1);
m_pBounds[0] = m_pDomains[0];
pArray = pDict->GetArrayFor("Bounds");
if (!pArray)
return false;
for (uint32_t i = 0; i < nSubs - 1; i++)
m_pBounds[i + 1] = pArray->GetFloatAt(i);
m_pBounds[nSubs] = m_pDomains[1];
m_pEncode = FX_Alloc2D(float, nSubs, 2);
pArray = pDict->GetArrayFor("Encode");
if (!pArray)
return false;
for (uint32_t i = 0; i < nSubs * 2; i++)
m_pEncode[i] = pArray->GetFloatAt(i);
return true;
}
bool CPDF_StitchFunc::v_Call(const float* inputs, float* results) const {
float input = inputs[0];
size_t i;
for (i = 0; i < m_pSubFunctions.size() - 1; i++) {
if (input < m_pBounds[i + 1])
break;
}
input = Interpolate(input, m_pBounds[i], m_pBounds[i + 1], m_pEncode[i * 2],
m_pEncode[i * 2 + 1]);
int nresults;
return m_pSubFunctions[i]->Call(&input, kRequiredNumInputs, results,
&nresults);
}
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