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_RAW_DETAIL_IS_ALLOWED_HPP 9 #define BOOST_GIL_EXTENSION_IO_RAW_DETAIL_IS_ALLOWED_HPP 10 11 #include <boost/gil/extension/io/raw/tags.hpp> 12 #include <boost/gil/io/base.hpp> 13 14 #include <type_traits> 15 16 namespace boost { namespace gil { namespace detail { 17 18 template< typename View > is_allowed(const image_read_info<raw_tag> & info,std::true_type)19bool is_allowed( const image_read_info< raw_tag >& info 20 , std::true_type // is read_and_no_convert 21 ) 22 { 23 using pixel_t = typename get_pixel_type<View>::type; 24 using num_channel_t = typename num_channels<pixel_t>::value_type; 25 using channel_t = typename channel_traits<typename element_type<typename View::value_type>::type>::value_type; 26 27 constexpr num_channel_t dst_samples_per_pixel = num_channels<pixel_t>::value; 28 constexpr unsigned int dst_bits_per_pixel = detail::unsigned_integral_num_bits<channel_t>::value; 29 constexpr bool is_type_signed = std::is_signed<channel_t>::value; 30 31 return (dst_samples_per_pixel == info._samples_per_pixel && 32 dst_bits_per_pixel == static_cast<unsigned int>(info._bits_per_pixel) && 33 !is_type_signed); 34 } 35 36 template< typename View > is_allowed(const image_read_info<raw_tag> &,std::false_type)37bool is_allowed( const image_read_info< raw_tag >& /* info */ 38 , std::false_type // is read_and_convert 39 ) 40 { 41 return true; 42 } 43 44 } // namespace detail 45 } // namespace gil 46 } // namespace boost 47 48 #endif 49