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43 lines
1016 B
C++
43 lines
1016 B
C++
#ifndef PL_TIFFPREDICTOR_HH
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#define PL_TIFFPREDICTOR_HH
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// This pipeline reverses the application of a TIFF predictor as described in the TIFF
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// specification.
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#include <qpdf/Pipeline.hh>
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#include<vector>
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class Pl_TIFFPredictor: public Pipeline
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{
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public:
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enum action_e { a_encode, a_decode };
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Pl_TIFFPredictor(
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char const* identifier,
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Pipeline* next,
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action_e action,
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unsigned int columns,
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unsigned int samples_per_pixel = 1,
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unsigned int bits_per_sample = 8);
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~Pl_TIFFPredictor() override = default;
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void write(unsigned char const* data, size_t len) override;
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void finish() override;
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private:
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void processRow();
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action_e action;
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unsigned int columns;
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unsigned int bytes_per_row;
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unsigned int samples_per_pixel;
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unsigned int bits_per_sample;
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std::vector<unsigned char> cur_row;
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std::vector<long long> previous;
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std::vector<unsigned char> out;
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Pipeline* p_next;
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};
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#endif // PL_TIFFPREDICTOR_HH
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