blob: ac17b282a987c2d9530734457af16ee94fcd54fa [file] [log] [blame]
// 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_expintfunc.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fxcrt/fx_memory.h"
CPDF_ExpIntFunc::CPDF_ExpIntFunc()
: CPDF_Function(Type::kType2ExpotentialInterpolation) {}
CPDF_ExpIntFunc::~CPDF_ExpIntFunc() {
FX_Free(m_pBeginValues);
FX_Free(m_pEndValues);
}
bool CPDF_ExpIntFunc::v_Init(const CPDF_Object* pObj,
std::set<const CPDF_Object*>* pVisited) {
const CPDF_Dictionary* pDict = pObj->GetDict();
if (!pDict)
return false;
{
const CPDF_Number* pExponent = ToNumber(pDict->GetObjectFor("N"));
if (!pExponent)
return false;
m_Exponent = pExponent->GetNumber();
}
const CPDF_Array* pArray0 = pDict->GetArrayFor("C0");
if (pArray0 && m_nOutputs == 0)
m_nOutputs = pArray0->GetCount();
if (m_nOutputs == 0)
m_nOutputs = 1;
const CPDF_Array* pArray1 = pDict->GetArrayFor("C1");
m_pBeginValues = FX_Alloc2D(float, m_nOutputs, 2);
m_pEndValues = FX_Alloc2D(float, m_nOutputs, 2);
for (uint32_t i = 0; i < m_nOutputs; i++) {
m_pBeginValues[i] = pArray0 ? pArray0->GetFloatAt(i) : 0.0f;
m_pEndValues[i] = pArray1 ? pArray1->GetFloatAt(i) : 1.0f;
}
FX_SAFE_UINT32 nOutputs = m_nOutputs;
nOutputs *= m_nInputs;
if (!nOutputs.IsValid())
return false;
m_nOrigOutputs = m_nOutputs;
m_nOutputs = nOutputs.ValueOrDie();
return true;
}
bool CPDF_ExpIntFunc::v_Call(const float* inputs, float* results) const {
for (uint32_t i = 0; i < m_nInputs; i++)
for (uint32_t j = 0; j < m_nOrigOutputs; j++) {
results[i * m_nOrigOutputs + j] =
m_pBeginValues[j] + FXSYS_pow(inputs[i], m_Exponent) *
(m_pEndValues[j] - m_pBeginValues[j]);
}
return true;
}