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- //
- // Copyright 2009 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_EXTENSION_IO_RAW_DETAIL_IS_ALLOWED_HPP
- #define BOOST_GIL_EXTENSION_IO_RAW_DETAIL_IS_ALLOWED_HPP
- #include <boost/gil/extension/io/raw/tags.hpp>
- #include <boost/gil/io/base.hpp>
- #include <type_traits>
- namespace boost { namespace gil { namespace detail {
- template< typename View >
- bool is_allowed( const image_read_info< raw_tag >& info
- , std::true_type // is read_and_no_convert
- )
- {
- using pixel_t = typename get_pixel_type<View>::type;
- using num_channel_t = typename num_channels<pixel_t>::value_type;
- using channel_t = typename channel_traits<typename element_type<typename View::value_type>::type>::value_type;
- constexpr num_channel_t dst_samples_per_pixel = num_channels<pixel_t>::value;
- constexpr unsigned int dst_bits_per_pixel = detail::unsigned_integral_num_bits<channel_t>::value;
- constexpr bool is_type_signed = std::is_signed<channel_t>::value;
- return (dst_samples_per_pixel == info._samples_per_pixel &&
- dst_bits_per_pixel == static_cast<unsigned int>(info._bits_per_pixel) &&
- !is_type_signed);
- }
- template< typename View >
- bool is_allowed( const image_read_info< raw_tag >& /* info */
- , std::false_type // is read_and_convert
- )
- {
- return true;
- }
- } // namespace detail
- } // namespace gil
- } // namespace boost
- #endif
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