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
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*************************************************************************
This project implements a complete(!) JPEG (Recommendation ITU-T
T.81 | ISO/IEC 10918-1) codec, plus a library that can be used to
encode and decode JPEG streams.
It also implements ISO/IEC 18477 aka JPEG XT which is an extension
towards intermediate, high-dynamic-range lossy and lossless coding
of JPEG. In specific, it supports ISO/IEC 18477-3/-6/-7/-8 encoding.
Note that only Profiles C and D of ISO/IEC 18477-7 are supported
here. Check the JPEG XT reference software for a full implementation
of ISO/IEC 18477-7.
Copyright (C) 2012-2018 Thomas Richter, University of Stuttgart and
Accusoft. (C) 2019-2020 Thomas Richter, Fraunhofer IIS.
This program is available under two licenses, GPLv3 and the ITU
Software licence Annex A Option 2, RAND conditions.
For the full text of the GPU license option, see README.license.gpl.
For the full text of the ITU license option, see README.license.itu.
You may freely select between these two options.
For the GPL option, please note the following:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*************************************************************************/
/*
**
** This is the base class for all predictors, to be used for the
** lossless predictive mode. It performs the prediction, based
** on the mode, in a virtual subclass.
**
** $Id: predictorbase.cpp,v 1.5 2017/08/17 13:24:00 thor Exp $
**
*/
/// Includes
#include "tools/environment.hpp"
#include "codestream/predictorbase.hpp"
#include "codestream/predictor.hpp"
#if ACCUSOFT_CODE
///
/// PredictorBase::CreatePredictor
// Create a predictor of the given preshift and mode.
template<PredictorBase::PredictionMode mode>
PredictorBase *PredictorBase::CreatePredictor(class Environ *env,UBYTE preshift,
LONG neutral)
{
switch(preshift) {
case 0:
return new(env) Predictor<mode,0>(neutral);
case 1:
return new(env) Predictor<mode,1>(neutral);
case 2:
return new(env) Predictor<mode,2>(neutral);
case 3:
return new(env) Predictor<mode,3>(neutral);
case 4:
return new(env) Predictor<mode,4>(neutral);
case 5:
return new(env) Predictor<mode,5>(neutral);
case 6:
return new(env) Predictor<mode,6>(neutral);
case 7:
return new(env) Predictor<mode,7>(neutral);
case 8:
return new(env) Predictor<mode,8>(neutral);
case 9:
return new(env) Predictor<mode,9>(neutral);
case 10:
return new(env) Predictor<mode,10>(neutral);
case 11:
return new(env) Predictor<mode,11>(neutral);
case 12:
return new(env) Predictor<mode,12>(neutral);
case 13:
return new(env) Predictor<mode,13>(neutral);
case 14:
return new(env) Predictor<mode,14>(neutral);
case 15:
return new(env) Predictor<mode,15>(neutral);
case 16:
return new(env) Predictor<mode,16>(neutral);
case 17:
return new(env) Predictor<mode,17>(neutral);
case 18:
return new(env) Predictor<mode,18>(neutral);
case 19:
return new(env) Predictor<mode,19>(neutral);
case 20:
return new(env) Predictor<mode,20>(neutral);
}
return NULL;
}
///
/// PredictorBase::CreatePredictor
// Create a predictor of the given preshift and mode.
PredictorBase *PredictorBase::CreatePredictor(class Environ *env,PredictorBase::PredictionMode mode,UBYTE preshift,LONG neutral)
{
switch(mode) {
case None:
return CreatePredictor<None>(env,preshift,neutral);
case Left:
return CreatePredictor<Left>(env,preshift,neutral);
case Top:
return CreatePredictor<Top>(env,preshift,neutral);
case LeftTop:
return CreatePredictor<LeftTop>(env,preshift,neutral);
case Linear:
return CreatePredictor<Linear>(env,preshift,neutral);
case WeightA:
return CreatePredictor<WeightA>(env,preshift,neutral);
case WeightB:
return CreatePredictor<WeightB>(env,preshift,neutral);
case Diagonal:
return CreatePredictor<Diagonal>(env,preshift,neutral);
case Neutral:
return CreatePredictor<Neutral>(env,preshift,neutral);
}
return NULL;
}
///
/// PredictorBase::CreatePredictorChain
// Create a prediction chain for the given neutral value and
// the given prediction mode. The mode "none" is used to
// indicate the differential mode.
// This requires an array of four predictors to be used for
// life-time management. The first element is the initial predictor.
void PredictorBase::CreatePredictorChain(class Environ *m_pEnviron,class PredictorBase *chain[4],
PredictionMode mode,UBYTE preshift,
LONG neutral)
{
if (preshift > 20)
JPG_THROW(OVERFLOW_PARAMETER,"PredictorBase::CreatePredictorChain",
"lossless predictive point transformation value is out of range, no code provisioned for it");
assert(chain[0] == NULL && chain[1] == NULL && chain[2] == NULL && chain[3] == NULL);
switch(mode) {
case None:
// This is differential. It only requires a single predictor.
chain[0] = CreatePredictor(m_pEnviron,mode,preshift,0);
assert(chain[0]);
// This predictor stays the same no matter how we move.
chain[0]->m_pNextRight = chain[0];
chain[0]->m_pNextDown = chain[0];
break;
case Left:
case Top:
case LeftTop:
case Linear:
case WeightA:
case WeightB:
case Diagonal:
// It starts with the neutral predictor top left.
chain[0] = CreatePredictor(m_pEnviron,Neutral,preshift,neutral);
chain[1] = CreatePredictor(m_pEnviron,Left ,preshift,0);
chain[2] = CreatePredictor(m_pEnviron,Top ,preshift,0);
chain[3] = CreatePredictor(m_pEnviron,mode ,preshift,0);
assert(chain[0] && chain[1] && chain[2] && chain[3]);
//
// Now link them in.
chain[0]->m_pNextRight = chain[1];
chain[1]->m_pNextRight = chain[1];
chain[0]->m_pNextDown = chain[2];
chain[1]->m_pNextDown = chain[3];
chain[2]->m_pNextRight = chain[3];
chain[2]->m_pNextDown = chain[2];
chain[3]->m_pNextRight = chain[3];
chain[3]->m_pNextDown = chain[3];
break;
default:
JPG_THROW(INVALID_PARAMETER,"PredictorBase::CreatePredictorChain",
"unable to initiate a lossless predictive scan, invalid prediction mode specified");
break;
}
}
///
///
#endif
|
