// // Copyright 2012 Christian Henning // // Distributed under the Boost Software License, Version 1.0 // See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt // #ifndef BOOST_GIL_IO_GET_READER_HPP #define BOOST_GIL_IO_GET_READER_HPP #include <boost/gil/io/get_read_device.hpp> #include <boost/gil/detail/mp11.hpp> #include <type_traits> namespace boost { namespace gil { /// \brief Helper metafunction to generate image reader type. template < typename T, typename FormatTag, typename ConversionPolicy, class Enable = void > struct get_reader {}; template <typename String, typename FormatTag, typename ConversionPolicy> struct get_reader < String, FormatTag, ConversionPolicy, typename std::enable_if < mp11::mp_and < detail::is_supported_path_spec<String>, is_format_tag<FormatTag> >::value >::type > { using device_t = typename get_read_device<String, FormatTag>::type; using type = reader<device_t, FormatTag, ConversionPolicy>; }; template <typename Device, typename FormatTag, typename ConversionPolicy> struct get_reader < Device, FormatTag, ConversionPolicy, typename std::enable_if < mp11::mp_and < detail::is_adaptable_input_device<FormatTag, Device>, is_format_tag<FormatTag> >::value >::type > { using device_t = typename get_read_device<Device, FormatTag>::type; using type = reader<device_t, FormatTag, ConversionPolicy>; }; /// \brief Helper metafunction to generate dynamic image reader type. template <typename T, typename FormatTag, class Enable = void> struct get_dynamic_image_reader { }; template <typename String, typename FormatTag> struct get_dynamic_image_reader < String, FormatTag, typename std::enable_if < mp11::mp_and < detail::is_supported_path_spec<String>, is_format_tag<FormatTag> >::value >::type > { using device_t = typename get_read_device<String, FormatTag>::type; using type = dynamic_image_reader<device_t, FormatTag>; }; template <typename Device, typename FormatTag> struct get_dynamic_image_reader < Device, FormatTag, typename std::enable_if < mp11::mp_and < detail::is_adaptable_input_device<FormatTag, Device>, is_format_tag<FormatTag> >::value >::type > { using device_t = typename get_read_device<Device, FormatTag>::type; using type = dynamic_image_reader<device_t, FormatTag>; }; /// \brief Helper metafunction to generate image backend type. template <typename T, typename FormatTag, class Enable = void> struct get_reader_backend { }; template <typename String, typename FormatTag> struct get_reader_backend < String, FormatTag, typename std::enable_if < mp11::mp_and < detail::is_supported_path_spec<String>, is_format_tag<FormatTag> >::value >::type > { using device_t = typename get_read_device<String, FormatTag>::type; using type = reader_backend<device_t, FormatTag>; }; template <typename Device, typename FormatTag> struct get_reader_backend < Device, FormatTag, typename std::enable_if < mp11::mp_and < detail::is_adaptable_input_device<FormatTag, Device>, is_format_tag<FormatTag> >::value >::type > { using device_t = typename get_read_device<Device, FormatTag>::type; using type = reader_backend<device_t, FormatTag>; }; /// \brief Helper metafunction to generate image scanline_reader type. template <typename T, typename FormatTag> struct get_scanline_reader { using device_t = typename get_read_device<T, FormatTag>::type; using type = scanline_reader<device_t, FormatTag>; }; } // namespace gil } // namespace boost #endif