opencv/modules/imgcodecs/src/grfmt_png.hpp

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#ifndef _GRFMT_PNG_H_
#define _GRFMT_PNG_H_

#ifdef HAVE_PNG

#include "grfmt_base.hpp"
#include "bitstrm.hpp"

namespace cv
{

class PngDecoder CV_FINAL : public BaseImageDecoder
{
public:

    PngDecoder();
    virtual ~PngDecoder();

    bool  readData( Mat& img ) CV_OVERRIDE;
    bool  readHeader() CV_OVERRIDE;
    void  close();

    ImageDecoder newDecoder() const CV_OVERRIDE;

protected:

    static void readDataFromBuf(void* png_ptr, uchar* dst, size_t size);

    int   m_bit_depth;
    void* m_png_ptr;  // pointer to decompression structure
    void* m_info_ptr; // pointer to image information structure
    void* m_end_info; // pointer to one more image information structure
    FILE* m_f;
    int   m_color_type;
    size_t m_buf_pos;
};


class PngEncoder CV_FINAL : public BaseImageEncoder
{
public:
    PngEncoder();
    virtual ~PngEncoder();

    bool  isFormatSupported( int depth ) const CV_OVERRIDE;
    bool  write( const Mat& img, const std::vector<int>& params ) CV_OVERRIDE;

    ImageEncoder newEncoder() const CV_OVERRIDE;

protected:
    static void writeDataToBuf(void* png_ptr, uchar* src, size_t size);
    static void flushBuf(void* png_ptr);
};

}

#endif

#endif/*_GRFMT_PNG_H_*/