//
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// Copyright 2009 Christian Henning
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#ifndef BOOST_GIL_EXTENSION_IO_PNM_DETAIL_IS_ALLOWED_HPP
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#define BOOST_GIL_EXTENSION_IO_PNM_DETAIL_IS_ALLOWED_HPP
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#include <boost/gil/extension/io/pnm/tags.hpp>
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#include <type_traits>
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namespace boost { namespace gil { namespace detail {
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template< typename View >
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bool is_allowed( const image_read_info< pnm_tag >& info
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, std::true_type // is read_and_no_convert
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)
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{
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pnm_image_type::type asc_type = is_read_supported< typename get_pixel_type< View >::type
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, pnm_tag
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>::_asc_type;
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pnm_image_type::type bin_type = is_read_supported< typename get_pixel_type< View >::type
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, pnm_tag
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>::_bin_type;
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if( info._type == pnm_image_type::mono_asc_t::value )
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{
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// ascii mono images are read gray8_image_t
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return ( asc_type == pnm_image_type::gray_asc_t::value );
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}
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return ( asc_type == info._type
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|| bin_type == info._type
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);
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}
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template< typename View >
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bool is_allowed( const image_read_info< pnm_tag >& /* info */
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, std::false_type // is read_and_convert
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)
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{
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return true;
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}
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} // namespace detail
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} // namespace gil
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} // namespace boost
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#endif
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