//
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// Copyright 2012 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_IO_GET_READER_HPP
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#define BOOST_GIL_IO_GET_READER_HPP
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#include <boost/gil/io/get_read_device.hpp>
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#include <boost/gil/detail/mp11.hpp>
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#include <type_traits>
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namespace boost { namespace gil {
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/// \brief Helper metafunction to generate image reader type.
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template
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<
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typename T,
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typename FormatTag,
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typename ConversionPolicy,
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class Enable = void
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>
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struct get_reader {};
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template <typename String, typename FormatTag, typename ConversionPolicy>
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struct get_reader
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<
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String,
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FormatTag,
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ConversionPolicy,
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typename std::enable_if
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<
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mp11::mp_and
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<
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detail::is_supported_path_spec<String>,
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is_format_tag<FormatTag>
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>::value
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>::type
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>
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{
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using device_t = typename get_read_device<String, FormatTag>::type;
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using type = reader<device_t, FormatTag, ConversionPolicy>;
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};
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template <typename Device, typename FormatTag, typename ConversionPolicy>
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struct get_reader
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<
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Device,
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FormatTag,
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ConversionPolicy,
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typename std::enable_if
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<
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mp11::mp_and
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<
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detail::is_adaptable_input_device<FormatTag, Device>,
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is_format_tag<FormatTag>
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>::value
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>::type
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>
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{
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using device_t = typename get_read_device<Device, FormatTag>::type;
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using type = reader<device_t, FormatTag, ConversionPolicy>;
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};
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/// \brief Helper metafunction to generate dynamic image reader type.
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template <typename T, typename FormatTag, class Enable = void>
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struct get_dynamic_image_reader
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{
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};
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template <typename String, typename FormatTag>
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struct get_dynamic_image_reader
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<
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String,
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FormatTag,
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typename std::enable_if
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<
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mp11::mp_and
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<
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detail::is_supported_path_spec<String>,
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is_format_tag<FormatTag>
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>::value
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>::type
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>
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{
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using device_t = typename get_read_device<String, FormatTag>::type;
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using type = dynamic_image_reader<device_t, FormatTag>;
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};
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template <typename Device, typename FormatTag>
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struct get_dynamic_image_reader
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<
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Device,
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FormatTag,
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typename std::enable_if
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<
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mp11::mp_and
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<
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detail::is_adaptable_input_device<FormatTag, Device>,
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is_format_tag<FormatTag>
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>::value
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>::type
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>
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{
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using device_t = typename get_read_device<Device, FormatTag>::type;
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using type = dynamic_image_reader<device_t, FormatTag>;
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};
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/// \brief Helper metafunction to generate image backend type.
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template <typename T, typename FormatTag, class Enable = void>
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struct get_reader_backend
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{
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};
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template <typename String, typename FormatTag>
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struct get_reader_backend
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<
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String,
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FormatTag,
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typename std::enable_if
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<
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mp11::mp_and
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<
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detail::is_supported_path_spec<String>,
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is_format_tag<FormatTag>
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>::value
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>::type
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>
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{
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using device_t = typename get_read_device<String, FormatTag>::type;
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using type = reader_backend<device_t, FormatTag>;
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};
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template <typename Device, typename FormatTag>
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struct get_reader_backend
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<
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Device,
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FormatTag,
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typename std::enable_if
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<
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mp11::mp_and
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<
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detail::is_adaptable_input_device<FormatTag, Device>,
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is_format_tag<FormatTag>
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>::value
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>::type
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>
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{
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using device_t = typename get_read_device<Device, FormatTag>::type;
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using type = reader_backend<device_t, FormatTag>;
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};
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/// \brief Helper metafunction to generate image scanline_reader type.
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template <typename T, typename FormatTag>
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struct get_scanline_reader
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{
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using device_t = typename get_read_device<T, FormatTag>::type;
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using type = scanline_reader<device_t, FormatTag>;
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};
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} // namespace gil
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} // namespace boost
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#endif
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