/* -*- 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.hpp"

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;

}

}

}