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 #include "core/fpdfapi/page/cpdf_expintfunc.h" 8 9 #include "core/fpdfapi/parser/cpdf_array.h" 10 #include "core/fpdfapi/parser/cpdf_dictionary.h" 11 #include "core/fxcrt/fx_memory.h" 12 13 CPDF_ExpIntFunc::CPDF_ExpIntFunc() 14 : CPDF_Function(Type::kType2ExpotentialInterpolation), 15 m_pBeginValues(nullptr), 16 m_pEndValues(nullptr) {} 17 18 CPDF_ExpIntFunc::~CPDF_ExpIntFunc() { 19 FX_Free(m_pBeginValues); 20 FX_Free(m_pEndValues); 21 } 22 23 bool CPDF_ExpIntFunc::v_Init(CPDF_Object* pObj) { 24 CPDF_Dictionary* pDict = pObj->GetDict(); 25 if (!pDict) 26 return false; 27 28 CPDF_Array* pArray0 = pDict->GetArrayFor("C0"); 29 if (m_nOutputs == 0) { 30 m_nOutputs = 1; 31 if (pArray0) 32 m_nOutputs = pArray0->GetCount(); 33 } 34 35 CPDF_Array* pArray1 = pDict->GetArrayFor("C1"); 36 m_pBeginValues = FX_Alloc2D(float, m_nOutputs, 2); 37 m_pEndValues = FX_Alloc2D(float, m_nOutputs, 2); 38 for (uint32_t i = 0; i < m_nOutputs; i++) { 39 m_pBeginValues[i] = pArray0 ? pArray0->GetFloatAt(i) : 0.0f; 40 m_pEndValues[i] = pArray1 ? pArray1->GetFloatAt(i) : 1.0f; 41 } 42 43 m_Exponent = pDict->GetFloatFor("N"); 44 m_nOrigOutputs = m_nOutputs; 45 if (m_nOutputs && m_nInputs > INT_MAX / m_nOutputs) 46 return false; 47 48 m_nOutputs *= m_nInputs; 49 return true; 50 } 51 52 bool CPDF_ExpIntFunc::v_Call(float* inputs, float* results) const { 53 for (uint32_t i = 0; i < m_nInputs; i++) 54 for (uint32_t j = 0; j < m_nOrigOutputs; j++) { 55 results[i * m_nOrigOutputs + j] = 56 m_pBeginValues[j] + FXSYS_pow(inputs[i], m_Exponent) * 57 (m_pEndValues[j] - m_pBeginValues[j]); 58 } 59 return true; 60 } 61
