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34 lines
818 B
C++
34 lines
818 B
C++
#ifndef IMG_DELTASTREAM_H
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#define IMG_DELTASTREAM_H
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#include "bitstream.h"
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namespace IMG {
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class DeltaStream : public BitStream1 {
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public:
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DeltaStream(const SubFile &file, SubFile::Handle &hdl, quint32 length)
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: BitStream1(file, hdl, length) {}
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bool init(quint8 info, bool extraBit, bool extended);
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bool readNext(qint32 &lonDelta, qint32 &latDelta)
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{
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return hasNext()
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? (readDelta(_lonBits, _lonSign, _extraBit, lonDelta)
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&& readDelta(_latBits, _latSign, false, latDelta)) : false;
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}
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bool atEnd() const {return !hasNext();}
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private:
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bool hasNext() const {return bitsAvailable() >= _readBits;}
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bool sign(int &val);
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bool readDelta(int bits, int sign, int extraBit, qint32 &delta);
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int _lonSign, _latSign, _extraBit;
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quint32 _lonBits, _latBits, _readBits;
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};
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}
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#endif // IMG_DELTASTREAM_H
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