read_image_info.hpp

//
// Copyright 2007-2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev
//
// 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_IO_READ_IMAGE_INFO_HPP
#define BOOST_GIL_IO_READ_IMAGE_INFO_HPP

#include <boost/gil/io/base.hpp>
#include <boost/gil/io/device.hpp>
#include <boost/gil/io/get_reader.hpp>
#include <boost/gil/io/path_spec.hpp>

#include <boost/mpl/and.hpp>
#include <boost/type_traits/is_base_and_derived.hpp>

#include <type_traits>

namespace boost{ namespace gil {


template <typename Device, typename FormatTag>
inline
auto read_image_info(Device& file, image_read_settings<FormatTag> const& settings,
    typename std::enable_if
    <
        mpl::and_
        <
            detail::is_adaptable_input_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
    -> typename get_reader_backend<Device, FormatTag>::type
{
    return make_reader_backend(file, settings);
}

template <typename Device, typename FormatTag>
inline
auto read_image_info(Device& file, FormatTag const&,
    typename std::enable_if
    <
        mpl::and_
        <
            detail::is_adaptable_input_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
    -> typename get_reader_backend<Device, FormatTag>::type
{
    return read_image_info(file, image_read_settings<FormatTag>());
}

template <typename String, typename FormatTag>
inline
auto read_image_info(
    String const& file_name, image_read_settings<FormatTag> const& settings,
    typename std::enable_if
    <
        mpl::and_
        <
            is_format_tag<FormatTag>,
            detail::is_supported_path_spec<String>
        >::value
    >::type* /*dummy*/ = nullptr)
    -> typename get_reader_backend<String, FormatTag>::type
{
    return make_reader_backend(file_name, settings);
}

template <typename String, typename FormatTag>
inline
auto read_image_info(String const& file_name, FormatTag const&,
    typename std::enable_if
    <
        mpl::and_
        <
            is_format_tag<FormatTag>,
            detail::is_supported_path_spec<String>
        >::value
    >::type* /*dummy*/ = nullptr)
    -> typename get_reader_backend<String, FormatTag>::type
{
    return read_image_info(file_name, image_read_settings<FormatTag>());
}

}} // namespace boost::gil

#endif