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//                        Intel License Agreement
//                For Open Source Computer Vision Library
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//M*/

#ifndef _GRFMT_PNG_H_
#define _GRFMT_PNG_H_

#ifdef HAVE_PNG

#include "grfmt_base.h"
#include "bitstrm.h"

/* libpng version only */

class GrFmtPngReader : public GrFmtReader
{
public:
    
    GrFmtPngReader( const char* filename );
    ~GrFmtPngReader();

    bool  CheckFormat( const char* signature );
    bool  ReadData( uchar* data, int step, int color );
    bool  ReadHeader();
    void  Close();

protected:

    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;
    int   m_bit_depth;
};


class GrFmtPngWriter : public GrFmtWriter
{
public:
    
    GrFmtPngWriter( const char* filename );
    ~GrFmtPngWriter();

    bool  WriteImage( const uchar* data, int step,
                      int width, int height, bool isColor );

protected:
};


// PNG filter factory
class GrFmtPng : public GrFmtFilterFactory
{
public:
    
    GrFmtPng();
    ~GrFmtPng();

    GrFmtReader* NewReader( const char* filename );
    GrFmtWriter* NewWriter( const char* filename );
    bool CheckSignature( const char* signature );
};

#endif

#endif/*_GRFMT_PNG_H_*/