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44 lines
1.0 KiB
44 lines
1.0 KiB
#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){return false;}
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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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