jpeg.h

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// jpeg.h       -- Thatcher Ulrich <tu@tulrich.com> 2002

// This source code has been donated to the Public Domain.  Do
// whatever you want with it.

// Wrapper for jpeg file operations.  The actual work is done by the
// IJG jpeg lib.

#ifndef JPEG_H
#define JPEG_H


#include "tu_config.h"

struct jpeg_decompress_struct;
struct jpeg_compress_struct;
class tu_file;


//
namespace jpeg
{
        class input {
                public:
                DSOEXPORT static input* create(tu_file* in);

//              // Read SWF JPEG2-style header (separate encoding
//              // table followed by image data), and create jpeg
//              // input object.
//              DSOEXPORT static input* create_swf_jpeg2(SDL_RWops* in);


                //
                DSOEXPORT static input* create_swf_jpeg2_header_only(tu_file* in);

                virtual ~input();

                virtual void    discard_partial_buffer() = 0;

                virtual void    start_image() = 0;
                virtual void    finish_image() = 0;

                virtual int     get_height() const = 0;
                virtual int     get_width() const = 0;
                virtual void    read_scanline(unsigned char* rgb_data) = 0;
        };


        // Helper object for writing jpeg image data.
        class output
        {
        public:
                // Create an output object.   Quality goes from 1-100.
                DSOEXPORT static output*        create(tu_file* out, int width, int height, int quality);

                virtual ~output();

                // ...
                virtual void    write_scanline(unsigned char* rgb_data) = 0;
        };
}


#endif // JPEG_H

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