# dlib C++ Library - webp_loader_abstract.h

    // Copyright (C) 2022  Davis E. King (davis@dlib.net), Martin Sandsmark, Adrià Arrufat
    // License: Boost Software License   See LICENSE.txt for the full license.
    #undef DLIB_WEBP_IMPORT_ABSTRACT
    #ifdef DLIB_WEBP_IMPORT_ABSTRACT

    #include "image_loader_abstract.h"
    #include "../algs.h"
    #include "../pixel.h"
    #include "../dir_nav.h"
    #include "../image_processing/generic_image.h"

    namespace dlib
    {

        class webp_loader : noncopyable
        {
            /*!
                WHAT THIS OBJECT REPRESENTS
                    This object represents a class capable of loading WEBP image files.
                    Once an instance of it is created to contain a WEBP file from
                    disk you can obtain the image stored in it via get_image().
            !*/

        public:

            webp_loader(
                const char* filename
            );
            /*!
                ensures
                    - loads the WEBP file with the given file name into this object
                throws
                    - std::bad_alloc
                    - image_load_error
                      This exception is thrown if there is some error that prevents
                      us from loading the given WEBP file.
            !*/

            webp_loader(
                const std::string& filename
            );
            /*!
                ensures
                    - loads the WEBP file with the given file name into this object
                throws
                    - std::bad_alloc
                    - image_load_error
                      This exception is thrown if there is some error that prevents
                      us from loading the given WEBP file.
            !*/

            webp_loader(
                const dlib::file& f
            );
            /*!
                ensures
                    - loads the WEBP file with the given file name into this object
                throws
                    - std::bad_alloc
                    - image_load_error
                      This exception is thrown if there is some error that prevents
                      us from loading the given WEBP file.
            !*/

            webp_loader(
                const unsigned char* imgbuffer,
                size_t buffersize
            );
            /*!
                ensures
                    - loads the WEBP from memory imgbuffer of size buffersize into this object
                throws
                    - image_load_error
                      This exception is thrown if there is some error that prevents
                      us from loading the given WEBP buffer.
            !*/

            ~webp_loader(
            );
            /*!
                ensures
                    - all resources associated with *this has been released
            !*/

            template<
                typename image_type
                >
            void get_image(
                image_type& img
            ) const;
            /*!
                requires
                    - image_type == an image object that implements the interface defined in
                      dlib/image_processing/generic_image.h
                ensures
                    - loads the WEBP image stored in this object into img
            !*/

        };

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

        template <
            typename image_type
            >
        void load_webp (
            image_type& image,
            const std::string& file_name
        );
        /*!
            requires
                - image_type == an image object that implements the interface defined in
                  dlib/image_processing/generic_image.h
            ensures
                - performs: webp_loader(file_name).get_image(image);
        !*/

        template <
            typename image_type
            >
        void load_webp (
            image_type& image,
            const unsigned char* imgbuff,
            size_t imgbuffsize
        );
        /*!
            requires
                - image_type == an image object that implements the interface defined in
                  dlib/image_processing/generic_image.h
            ensures
                - performs: webp_loader(imgbuff, imgbuffsize).get_image(image);
        !*/

        template <
            typename image_type
            >
        void load_webp (
            image_type& image,
            const char* imgbuff,
            size_t imgbuffsize
        );
        /*!
            requires
                - image_type == an image object that implements the interface defined in
                  dlib/image_processing/generic_image.h
            ensures
                - performs: webp_loader((unsigned char*)imgbuff, imgbuffsize).get_image(image);
        !*/

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

    }

    #endif // DLIB_WEBP_IMPORT_ABSTRACT