nefcfaiterator.cpp

00001 /* -*- mode:c++; tab-width:4; c-basic-offset:4 -*- */
00002 /*
00003  * libopenraw - nefcfaiterator.h
00004  *
00005  * Copyright (C) 2008 Rafael Avila de Espindola.
00006  *
00007  * This library is free software: you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public License
00009  * as published by the Free Software Foundation, either version 3 of
00010  * the License, or (at your option) any later version.
00011  *
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with this library.  If not, see
00019  * <http://www.gnu.org/licenses/>.
00020  */
00021 
00022 #include "nefcfaiterator.h"
00023 
00024 namespace OpenRaw {
00025 namespace Internals {
00026 
00027 NefCfaIterator::NefCfaIterator(const NefDiffIterator& diffs, size_t rows,
00028                                size_t columns, const uint16_t init[2][2])
00029     : m_diffs(diffs), m_rows(rows),
00030       m_columns(columns), m_row(0),
00031       m_column(0)
00032 {
00033     for (int i = 0; i < 2; ++i) {
00034         for (int j = 0; j < 2; ++j) {
00035             m_vpred[i][j] = init[i][j];
00036         }
00037         m_hpred[i] = 0x148;
00038     }
00039 }
00040 
00041 uint16_t NefCfaIterator::get()
00042 {
00043     int diff = m_diffs.get();
00044     uint16_t ret;
00045     if (m_column < 2) {
00046         ret = m_vpred[m_row & 1][m_column] + diff;
00047         m_vpred[m_row & 1][m_column] = ret;
00048 
00049     } else {
00050         ret = m_hpred[m_column & 1] + diff;
00051     }
00052     m_hpred[m_column & 1] = ret;
00053 
00054     m_column++;
00055     if (m_column == m_columns) {
00056         m_column = 0;
00057         m_row++;
00058     }
00059     return ret;
00060 }
00061 
00062 }
00063 }
00064 

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