boost/gil/io/get_reader.hpp
// // 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> 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 enable_if< mpl::and_< detail::is_supported_path_spec< String > , is_format_tag< FormatTag > > >::type > { typedef typename get_read_device< String , FormatTag >::type device_t; typedef reader< device_t , FormatTag , ConversionPolicy > type; }; template< typename Device , typename FormatTag , typename ConversionPolicy > struct get_reader< Device , FormatTag , ConversionPolicy , typename enable_if< mpl::and_< detail::is_adaptable_input_device< FormatTag , Device > , is_format_tag< FormatTag > > >::type > { typedef typename get_read_device< Device , FormatTag >::type device_t; typedef reader< device_t , FormatTag , ConversionPolicy > type; }; /// \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 enable_if< mpl::and_< detail::is_supported_path_spec< String > , is_format_tag< FormatTag > > >::type > { typedef typename get_read_device< String , FormatTag >::type device_t; typedef dynamic_image_reader< device_t , FormatTag > type; }; template< typename Device , typename FormatTag > struct get_dynamic_image_reader< Device , FormatTag , typename enable_if< mpl::and_< detail::is_adaptable_input_device< FormatTag , Device > , is_format_tag< FormatTag > > >::type > { typedef typename get_read_device< Device , FormatTag >::type device_t; typedef dynamic_image_reader< device_t , FormatTag > type; }; ///////////////////////////////////////////////////////////// /// \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 enable_if< mpl::and_< detail::is_supported_path_spec< String > , is_format_tag< FormatTag > > >::type > { typedef typename get_read_device< String , FormatTag >::type device_t; typedef reader_backend< device_t , FormatTag > type; }; template< typename Device , typename FormatTag > struct get_reader_backend< Device , FormatTag , typename enable_if< mpl::and_< detail::is_adaptable_input_device< FormatTag , Device > , is_format_tag< FormatTag > > >::type > { typedef typename get_read_device< Device , FormatTag >::type device_t; typedef reader_backend< device_t , FormatTag > type; }; /// \brief Helper metafunction to generate image scanline_reader type. template< typename T , typename FormatTag > struct get_scanline_reader { typedef typename get_read_device< T , FormatTag >::type device_t; typedef scanline_reader< device_t , FormatTag > type; }; } // namespace gil } // namespace boost #endif