libopenraw
nefcfaiterator.cpp
1 /* -*- mode:c++; tab-width:4; c-basic-offset:4 -*- */
2 /*
3  * libopenraw - nefcfaiterator.h
4  *
5  * Copyright (C) 2008 Rafael Avila de Espindola.
6  *
7  * This library is free software: you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public License
9  * as published by the Free Software Foundation, either version 3 of
10  * the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library. If not, see
19  * <http://www.gnu.org/licenses/>.
20  */
21 
22 #include "nefcfaiterator.hpp"
23 
24 namespace OpenRaw {
25 namespace Internals {
26 
27 NefCfaIterator::NefCfaIterator(const NefDiffIterator& diffs, size_t rows,
28  size_t columns, const uint16_t init[2][2])
29  : m_diffs(diffs), m_rows(rows),
30  m_columns(columns), m_row(0),
31  m_column(0)
32 {
33  for (int i = 0; i < 2; ++i) {
34  for (int j = 0; j < 2; ++j) {
35  m_vpred[i][j] = init[i][j];
36  }
37  m_hpred[i] = 0x148;
38  }
39 }
40 
41 uint16_t NefCfaIterator::get()
42 {
43  int diff = m_diffs.get();
44  uint16_t ret;
45  if (m_column < 2) {
46  ret = m_vpred[m_row & 1][m_column] + diff;
47  m_vpred[m_row & 1][m_column] = ret;
48 
49  } else {
50  ret = m_hpred[m_column & 1] + diff;
51  }
52  m_hpred[m_column & 1] = ret;
53 
54  m_column++;
55  if (m_column == m_columns) {
56  m_column = 0;
57  m_row++;
58  }
59  return ret;
60 }
61 
62 }
63 }
64 
CIFF is the container for CRW files. It is an attempt from Canon to make this a standard. I guess it failed.
Definition: arwfile.cpp:30