libqpdf/qpdf/Pl_TIFFPredictor.hh


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#ifndef PL_TIFFPREDICTOR_HH
#define PL_TIFFPREDICTOR_HH

// This pipeline reverses the application of a TIFF predictor as
// described in the TIFF specification.

#include <qpdf/Pipeline.hh>

class Pl_TIFFPredictor: public Pipeline
{
  public:
    enum action_e { a_encode, a_decode };

    Pl_TIFFPredictor(
        char const* identifier,
        Pipeline* next,
        action_e action,
        unsigned int columns,
        unsigned int samples_per_pixel = 1,
        unsigned int bits_per_sample = 8);
    virtual ~Pl_TIFFPredictor();

    virtual void write(unsigned char* data, size_t len);
    virtual void finish();

  private:
    void processRow();

    action_e action;
    unsigned int columns;
    unsigned int bytes_per_row;
    unsigned int samples_per_pixel;
    unsigned int bits_per_sample;
    std::shared_ptr<unsigned char> cur_row;
    size_t pos;
};

#endif // PL_TIFFPREDICTOR_HH