1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
// 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_function.h"
#include <vector>
#include "core/fpdfapi/page/cpdf_expintfunc.h"
#include "core/fpdfapi/page/cpdf_psfunc.h"
#include "core/fpdfapi/page/cpdf_sampledfunc.h"
#include "core/fpdfapi/page/cpdf_stitchfunc.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "third_party/base/ptr_util.h"
// static
std::unique_ptr<CPDF_Function> CPDF_Function::Load(CPDF_Object* pFuncObj) {
std::set<CPDF_Object*> visited;
return Load(pFuncObj, &visited);
}
// static
std::unique_ptr<CPDF_Function> CPDF_Function::Load(
CPDF_Object* pFuncObj,
std::set<CPDF_Object*>* pVisited) {
if (!pFuncObj)
return nullptr;
if (pdfium::ContainsKey(*pVisited, pFuncObj))
return nullptr;
pdfium::ScopedSetInsertion<CPDF_Object*> insertion(pVisited, pFuncObj);
int iType = -1;
if (CPDF_Stream* pStream = pFuncObj->AsStream())
iType = pStream->GetDict()->GetIntegerFor("FunctionType");
else if (CPDF_Dictionary* pDict = pFuncObj->AsDictionary())
iType = pDict->GetIntegerFor("FunctionType");
std::unique_ptr<CPDF_Function> pFunc;
Type type = IntegerToFunctionType(iType);
if (type == Type::kType0Sampled)
pFunc = pdfium::MakeUnique<CPDF_SampledFunc>();
else if (type == Type::kType2ExpotentialInterpolation)
pFunc = pdfium::MakeUnique<CPDF_ExpIntFunc>();
else if (type == Type::kType3Stitching)
pFunc = pdfium::MakeUnique<CPDF_StitchFunc>();
else if (type == Type::kType4PostScript)
pFunc = pdfium::MakeUnique<CPDF_PSFunc>();
if (!pFunc || !pFunc->Init(pFuncObj, pVisited))
return nullptr;
return pFunc;
}
// static
CPDF_Function::Type CPDF_Function::IntegerToFunctionType(int iType) {
switch (iType) {
case 0:
case 2:
case 3:
case 4:
return static_cast<Type>(iType);
default:
return Type::kTypeInvalid;
}
}
CPDF_Function::CPDF_Function(Type type)
: m_pDomains(nullptr), m_pRanges(nullptr), m_Type(type) {}
CPDF_Function::~CPDF_Function() {
FX_Free(m_pDomains);
FX_Free(m_pRanges);
}
bool CPDF_Function::Init(CPDF_Object* pObj, std::set<CPDF_Object*>* pVisited) {
CPDF_Stream* pStream = pObj->AsStream();
CPDF_Dictionary* pDict = pStream ? pStream->GetDict() : pObj->AsDictionary();
CPDF_Array* pDomains = pDict->GetArrayFor("Domain");
if (!pDomains)
return false;
m_nInputs = pDomains->GetCount() / 2;
if (m_nInputs == 0)
return false;
{
size_t nInputs = m_nInputs * 2;
m_pDomains = FX_Alloc(float, nInputs);
for (size_t i = 0; i < nInputs; ++i)
m_pDomains[i] = pDomains->GetFloatAt(i);
}
CPDF_Array* pRanges = pDict->GetArrayFor("Range");
m_nOutputs = pRanges ? pRanges->GetCount() / 2 : 0;
// Ranges are required for type 0 and type 4 functions. A non-zero
// |m_nOutputs| here implied Ranges meets the requirements.
{
bool bRangeRequired =
m_Type == Type::kType0Sampled || m_Type == Type::kType4PostScript;
if (bRangeRequired && m_nOutputs == 0)
return false;
}
if (m_nOutputs > 0) {
size_t nOutputs = m_nOutputs * 2;
m_pRanges = FX_Alloc(float, nOutputs);
for (size_t i = 0; i < nOutputs; ++i)
m_pRanges[i] = pRanges->GetFloatAt(i);
}
uint32_t old_outputs = m_nOutputs;
if (!v_Init(pObj, pVisited))
return false;
if (m_pRanges && m_nOutputs > old_outputs) {
FX_SAFE_SIZE_T nOutputs = m_nOutputs;
nOutputs *= 2;
m_pRanges = FX_Realloc(float, m_pRanges, nOutputs.ValueOrDie());
memset(m_pRanges + (old_outputs * 2), 0,
sizeof(float) * (m_nOutputs - old_outputs) * 2);
}
return true;
}
bool CPDF_Function::Call(const float* inputs,
uint32_t ninputs,
float* results,
int* nresults) const {
if (m_nInputs != ninputs)
return false;
*nresults = m_nOutputs;
std::vector<float> clamped_inputs(m_nInputs);
for (uint32_t i = 0; i < m_nInputs; i++) {
clamped_inputs[i] =
pdfium::clamp(inputs[i], m_pDomains[i * 2], m_pDomains[i * 2 + 1]);
}
if (!v_Call(clamped_inputs.data(), results))
return false;
if (!m_pRanges)
return true;
for (uint32_t i = 0; i < m_nOutputs; i++) {
results[i] =
pdfium::clamp(results[i], m_pRanges[i * 2], m_pRanges[i * 2 + 1]);
}
return true;
}
// See PDF Reference 1.7, page 170.
float CPDF_Function::Interpolate(float x,
float xmin,
float xmax,
float ymin,
float ymax) const {
float divisor = xmax - xmin;
return ymin + (divisor ? (x - xmin) * (ymax - ymin) / divisor : 0);
}
const CPDF_SampledFunc* CPDF_Function::ToSampledFunc() const {
return m_Type == Type::kType0Sampled
? static_cast<const CPDF_SampledFunc*>(this)
: nullptr;
}
const CPDF_ExpIntFunc* CPDF_Function::ToExpIntFunc() const {
return m_Type == Type::kType2ExpotentialInterpolation
? static_cast<const CPDF_ExpIntFunc*>(this)
: nullptr;
}
const CPDF_StitchFunc* CPDF_Function::ToStitchFunc() const {
return m_Type == Type::kType3Stitching
? static_cast<const CPDF_StitchFunc*>(this)
: nullptr;
}
|
