jpeg.hh

#ifndef VTESTBED_JPEG_JPEG_HH
#define VTESTBED_JPEG_JPEG_HH

#include <stdio.h>
#include <jpeglib.h>

namespace vtb {

    namespace jpeg {

        using byte_type = JSAMPLE;

        enum class Color_space: int {
            Unknown = JCS_UNKNOWN,
            Grayscale = JCS_GRAYSCALE,
            RGB = JCS_RGB,
            RGBA = JCS_EXT_RGBA,
            YUV = JCS_YCbCr,
            CMYK = JCS_CMYK,
            YCCK = JCS_YCCK,
        };

        class jpeg_compress: ::jpeg_compress_struct {

        private:
            ::jpeg_error_mgr _err;
            FILE* _outfile = nullptr;

        public:

            jpeg_compress(
                const char* filename,
                Color_space colorspace,
                int width,
                int height,
                int quality,
                int ncomponents
            );

            ~jpeg_compress();

            void write(const byte_type* bytes);
            void write_reverse(const byte_type* bytes);

        private:
            inline void start() { ::jpeg_start_compress(this, TRUE); }
            inline void finish() { ::jpeg_finish_compress(this); }
            inline void close() { ::fclose(this->_outfile); }
            inline void destroy() { ::jpeg_destroy_compress(this); }

        };

    }

}

#endif // vim:filetype=cpp