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73 lines
2.0 KiB
73 lines
2.0 KiB
/*
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* Copyright (C) 2015-2022 Département de l'Instruction Publique (DIP-SEM)
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*
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* Copyright (C) 2013 Open Education Foundation
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*
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* Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
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* l'Education Numérique en Afrique (GIP ENA)
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*
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* This file is part of OpenBoard.
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*
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* OpenBoard is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License,
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* with a specific linking exception for the OpenSSL project's
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* "OpenSSL" library (or with modified versions of it that use the
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* same license as the "OpenSSL" library).
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*
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* OpenBoard is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenBoard. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef FILTER_PREDICTOR_H
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#define FILTER_PREDICTOR_H
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#include <string>
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#include "Decoder.h"
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namespace merge_lib
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{
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// this method performs filter prediction processing.
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class FilterPredictor:public Decoder
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{
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public:
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FilterPredictor();
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virtual ~FilterPredictor();
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bool encode(std::string & decoded);
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bool decode(std::string & encoded);
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void initialize(Object * objectWithStream);
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static const std::string PREDICTOR_TOKEN;
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static const std::string DECODE_PARAM_TOKEN;
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int getEarlyChange() const { return _earlyChange;}
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private:
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bool decodeRow(const char *input, std::string &out,const std::string &prev,int curPrediction);
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void obtainDecodeParams(Object*objectWithStream,std::string &dictStr);
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std::string getDictionaryContentStr(std::string & in, size_t &pos );
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int _predictor;
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int _colors;
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int _bits;
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int _columns;
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int _earlyChange;
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int _rowLen;
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int _bytesPerPixel;
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};
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}
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#endif
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