1 // 2 // Copyright 2009 Christian Henning 3 // 4 // Distributed under the Boost Software License, Version 1.0 5 // See accompanying file LICENSE_1_0.txt or copy at 6 // http://www.boost.org/LICENSE_1_0.txt 7 // 8 #ifndef BOOST_GIL_EXTENSION_IO_JPEG_DETAIL_IS_ALLOWED_HPP 9 #define BOOST_GIL_EXTENSION_IO_JPEG_DETAIL_IS_ALLOWED_HPP 10 11 #include <boost/gil/extension/io/jpeg/tags.hpp> 12 13 #include <type_traits> 14 15 namespace boost { namespace gil { namespace detail { 16 17 template< typename View > is_allowed(const image_read_info<jpeg_tag> & info,std::true_type)18bool is_allowed( const image_read_info< jpeg_tag >& info 19 , std::true_type // is read_and_no_convert 20 ) 21 { 22 if( info._color_space == JCS_YCbCr ) 23 { 24 // We read JCS_YCbCr files as rgb. 25 return ( is_read_supported< typename View::value_type 26 , jpeg_tag 27 >::_color_space == JCS_RGB ); 28 } 29 30 return ( is_read_supported< typename View::value_type 31 , jpeg_tag 32 >::_color_space == info._color_space ); 33 } 34 35 template< typename View > is_allowed(const image_read_info<jpeg_tag> &,std::false_type)36bool is_allowed( const image_read_info< jpeg_tag >& /* info */ 37 , std::false_type // is read_and_convert 38 ) 39 { 40 return true; 41 } 42 43 } // namespace detail 44 } // namespace gil 45 } // namespace boost 46 47 #endif 48