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/* -*- mode:c++; tab-width:4; c-basic-offset:4 -*- */
/*
* libopenraw - nefcfaiterator.h
*
* Copyright (C) 2008 Rafael Avila de Espindola.
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include "nefcfaiterator.h"
namespace OpenRaw {
namespace Internals {
NefCfaIterator::NefCfaIterator(const NefDiffIterator& diffs, size_t rows,
size_t columns, const uint16_t init[2][2])
: m_diffs(diffs), m_rows(rows),
m_columns(columns), m_row(0),
m_column(0)
{
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < 2; ++j) {
m_vpred[i][j] = init[i][j];
}
m_hpred[i] = 0x148;
}
}
uint16_t NefCfaIterator::get()
{
int diff = m_diffs.get();
uint16_t ret;
if (m_column < 2) {
ret = m_vpred[m_row & 1][m_column] + diff;
m_vpred[m_row & 1][m_column] = ret;
} else {
ret = m_hpred[m_column & 1] + diff;
}
m_hpred[m_column & 1] = ret;
m_column++;
if (m_column == m_columns) {
m_column = 0;
m_row++;
}
return ret;
}
}
}
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