make_writer.hpp

//
// Copyright 2012 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_IO_MAKE_WRITER_HPP
#define BOOST_GIL_IO_MAKE_WRITER_HPP
 
#include <boost/gil/detail/mp11.hpp>
#include <boost/gil/io/get_writer.hpp>
 
#include <type_traits>
 
namespace boost { namespace gil {
 
template <typename String, typename FormatTag>
inline
auto make_writer(String const& file_name, image_write_info<FormatTag> const& info,
    typename std::enable_if
    <
        mp11::mp_and
        <
            detail::is_supported_path_spec<String>,
            is_format_tag<FormatTag>
        >::value>::type* /*dummy*/ = nullptr)
    -> typename get_writer<String, FormatTag>::type
{
    typename get_write_device<String, FormatTag>::type device(
    detail::convert_to_native_string(file_name),
    typename detail::file_stream_device<FormatTag>::write_tag());
 
    return typename get_writer<String, FormatTag>::type(device, info);
}
 
template <typename FormatTag>
inline
auto make_writer(std::wstring const& file_name, image_write_info<FormatTag> const& info)
    -> typename get_writer<std::wstring, FormatTag>::type
{
    const char* str = detail::convert_to_native_string( file_name );
 
    typename get_write_device< std::wstring
                    , FormatTag
                    >::type device( str
                                  , typename detail::file_stream_device< FormatTag >::write_tag()
                                  );
 
    delete[] str;
 
    return typename get_writer< std::wstring
                              , FormatTag
                              >::type( device
                                     , info
                                     );
}
 
template <typename FormatTag>
inline
auto make_writer(detail::filesystem::path const& path, image_write_info<FormatTag> const& info)
    -> typename get_writer<std::wstring, FormatTag>::type
{
    return make_writer(path.wstring(), info);
}
 
template <typename Device, typename FormatTag>
inline
auto make_writer(Device& file, image_write_info<FormatTag> const& info,
    typename std::enable_if
    <
        mp11::mp_and
        <
            typename detail::is_adaptable_output_device<FormatTag, Device>::type,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
    -> typename get_writer<Device, FormatTag>::type
{
    typename get_write_device<Device, FormatTag>::type device(file);
    return typename get_writer<Device, FormatTag>::type(device, info);
}
 
// no image_write_info
 
template <typename String, typename FormatTag>
inline
auto make_writer(String const& file_name, FormatTag const&,
    typename std::enable_if
    <
        mp11::mp_and
        <
            detail::is_supported_path_spec<String>,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
    -> typename get_writer<String, FormatTag>::type
{
    return make_writer(file_name, image_write_info<FormatTag>());
}
 
template <typename FormatTag>
inline
auto make_writer(std::wstring const &file_name, FormatTag const&)
    -> typename get_writer<std::wstring, FormatTag>::type
{
    return make_writer( file_name
                      , image_write_info< FormatTag >()
                      );
}
 
template <typename FormatTag>
inline
auto make_writer(detail::filesystem::path const& path, FormatTag const& tag)
    -> typename get_writer<std::wstring, FormatTag>::type
{
    return make_writer(path.wstring(), tag);
}
 
template <typename Device, typename FormatTag>
inline
auto make_writer(Device& file, FormatTag const&,
    typename std::enable_if
    <
        mp11::mp_and
        <
            typename detail::is_adaptable_output_device<FormatTag, Device>::type,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
    -> typename get_writer<Device, FormatTag>::type
{
    return make_writer(file, image_write_info<FormatTag>());
}
 
}} // namespace boost::gil
 
#endif