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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
2 years ago
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//
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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_RAW_DETAIL_IS_ALLOWED_HPP
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#define BOOST_GIL_EXTENSION_IO_RAW_DETAIL_IS_ALLOWED_HPP
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#include <boost/gil/extension/io/raw/tags.hpp>
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#include <boost/gil/io/base.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< raw_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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using pixel_t = typename get_pixel_type<View>::type;
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using num_channel_t = typename num_channels<pixel_t>::value_type;
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using channel_t = typename channel_traits<typename element_type<typename View::value_type>::type>::value_type;
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constexpr num_channel_t dst_samples_per_pixel = num_channels<pixel_t>::value;
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constexpr unsigned int dst_bits_per_pixel = detail::unsigned_integral_num_bits<channel_t>::value;
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constexpr bool is_type_signed = std::is_signed<channel_t>::value;
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return (dst_samples_per_pixel == info._samples_per_pixel &&
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dst_bits_per_pixel == static_cast<unsigned int>(info._bits_per_pixel) &&
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!is_type_signed);
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}
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template< typename View >
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bool is_allowed( const image_read_info< raw_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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