    // Copyright (C) 2006  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #undef DLIB_IMAGE_LOADEr_ABSTRACT_
    #ifdef DLIB_IMAGE_LOADEr_ABSTRACT_

    #include <iosfwd>
    #include "../algs.h"
    #include "../pixel.h"

    namespace dlib
    {
        class image_load_error : public dlib::error
        {
            /*!
                WHAT THIS OBJECT REPRESENTS
                    This is an exception used to indicate a failure to load an image.
                    Its type member variable will be set to EIMAGE_LOAD.
            !*/
        };

    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        void load_bmp (
            image_type& image,
            std::istream& in
        );
        /*!
            requires
                - image_type == is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<typename image_type::type> is defined
            ensures
                - #image == the image of the MS Windows BMP file that was available
                  in the input stream in.
                - #image[0][0] will be the upper left corner of the image
                - #image[image.nr()-1][image.nc()-1] will be the lower right
                  corner of the image
                - Performs any color space conversion necessary to convert the
                  BMP image data into the pixel type used by the given image
                  object.
            throws
                - image_load_error
                    This exception is thrown if there is an error that prevents us
                    from loading the image.  If this exception is thrown then
                    #image will have an initial value for its type.
                - std::bad_alloc
                    If this exception is thrown then #image will have an initial
                    value for its type.
        !*/

    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        void load_bmp (
            image_type& image,
            const std::string& file_name
        );
        /*!
            requires
                - image_type == is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<typename image_type::type> is defined
            ensures
                - opens the file indicated by file_name with an input file stream named fin
                  and performs:
                  load_bmp(image,fin);
        !*/

    // ----------------------------------------------------------------------------------------

        /*!
            dlib dng file format:
                This is a file format I created for this library.  It is a lossless
                compressed image format that is similar to the PNG format but uses
                the dlib PPM compression algorithms instead of the DEFLATE algorithm.
        !*/

        template <
            typename image_type
            >
        void load_dng (
            image_type& image,
            std::istream& in
        );
        /*!
            requires
                - image_type == is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<typename image_type::type> is defined
            ensures
                - #image == the image of the dlib dng file that was available
                  in the input stream in.
                - #image[0][0] will be the upper left corner of the image
                - #image[image.nr()-1][image.nc()-1] will be the lower right
                  corner of the image
                - Performs any color space conversion necessary to convert the
                  dng image data into the pixel type used by the given image
                  object.
            throws
                - image_load_error
                    This exception is thrown if there is an error that prevents us
                    from loading the image.  If this exception is thrown then
                    #image will have an initial value for its type.
                - std::bad_alloc
                    If this exception is thrown then #image will have an initial
                    value for its type.
        !*/

    // ----------------------------------------------------------------------------------------

        template <
            typename image_type
            >
        void load_dng (
            image_type& image,
            const std::string& file_name
        );
        /*!
            requires
                - image_type == is an implementation of array2d/array2d_kernel_abstract.h
                - pixel_traits<typename image_type::type> is defined
            ensures
                - opens the file indicated by file_name with an input file stream named fin
                  and performs:
                  load_dng(image,fin);
        !*/

    // ----------------------------------------------------------------------------------------

    }

    #endif // DLIB_IMAGE_LOADEr_ABSTRACT_