gil/io/make_writer.hpp

0001 //
0002 // Copyright 2012 Christian Henning
0003 //
0004 // Distributed under the Boost Software License, Version 1.0
0005 // See accompanying file LICENSE_1_0.txt or copy at
0006 // http://www.boost.org/LICENSE_1_0.txt
0007 //
0008 #ifndef BOOST_GIL_IO_MAKE_WRITER_HPP
0009 #define BOOST_GIL_IO_MAKE_WRITER_HPP
0010
0011 #include <boost/gil/detail/mp11.hpp>
0012 #include <boost/gil/io/get_writer.hpp>
0013
0014 #include <type_traits>
0015
0016 namespace boost { namespace gil {
0017
0018 template <typename String, typename FormatTag>
0019 inline
0020 auto make_writer(String const& file_name, image_write_info<FormatTag> const& info,
0021     typename std::enable_if
0022     <
0023         mp11::mp_and
0024         <
0025             detail::is_supported_path_spec<String>,
0026             is_format_tag<FormatTag>
0027         >::value>::type* /*dummy*/ = nullptr)
0028     -> typename get_writer<String, FormatTag>::type
0029 {
0030     typename get_write_device<String, FormatTag>::type device(
0031     detail::convert_to_native_string(file_name),
0032     typename detail::file_stream_device<FormatTag>::write_tag());
0033
0034     return typename get_writer<String, FormatTag>::type(device, info);
0035 }
0036
0037 template <typename FormatTag>
0038 inline
0039 auto make_writer(std::wstring const& file_name, image_write_info<FormatTag> const& info)
0040     -> typename get_writer<std::wstring, FormatTag>::type
0041 {
0042     const char* str = detail::convert_to_native_string( file_name );
0043
0044     typename get_write_device< std::wstring
0045                     , FormatTag
0046                     >::type device( str
0047                                   , typename detail::file_stream_device< FormatTag >::write_tag()
0048                                   );
0049
0050     delete[] str;
0051
0052     return typename get_writer< std::wstring
0053                               , FormatTag
0054                               >::type( device
0055                                      , info
0056                                      );
0057 }
0058
0059 template <typename FormatTag>
0060 inline
0061 auto make_writer(detail::filesystem::path const& path, image_write_info<FormatTag> const& info)
0062     -> typename get_writer<std::wstring, FormatTag>::type
0063 {
0064     return make_writer(path.wstring(), info);
0065 }
0066
0067 template <typename Device, typename FormatTag>
0068 inline
0069 auto make_writer(Device& file, image_write_info<FormatTag> const& info,
0070     typename std::enable_if
0071     <
0072         mp11::mp_and
0073         <
0074             typename detail::is_adaptable_output_device<FormatTag, Device>::type,
0075             is_format_tag<FormatTag>
0076         >::value
0077     >::type* /*dummy*/ = nullptr)
0078     -> typename get_writer<Device, FormatTag>::type
0079 {
0080     typename get_write_device<Device, FormatTag>::type device(file);
0081     return typename get_writer<Device, FormatTag>::type(device, info);
0082 }
0083
0084 // no image_write_info
0085
0086 template <typename String, typename FormatTag>
0087 inline
0088 auto make_writer(String const& file_name, FormatTag const&,
0089     typename std::enable_if
0090     <
0091         mp11::mp_and
0092         <
0093             detail::is_supported_path_spec<String>,
0094             is_format_tag<FormatTag>
0095         >::value
0096     >::type* /*dummy*/ = nullptr)
0097     -> typename get_writer<String, FormatTag>::type
0098 {
0099     return make_writer(file_name, image_write_info<FormatTag>());
0100 }
0101
0102 template <typename FormatTag>
0103 inline
0104 auto make_writer(std::wstring const &file_name, FormatTag const&)
0105     -> typename get_writer<std::wstring, FormatTag>::type
0106 {
0107     return make_writer( file_name
0108                       , image_write_info< FormatTag >()
0109                       );
0110 }
0111
0112 template <typename FormatTag>
0113 inline
0114 auto make_writer(detail::filesystem::path const& path, FormatTag const& tag)
0115     -> typename get_writer<std::wstring, FormatTag>::type
0116 {
0117     return make_writer(path.wstring(), tag);
0118 }
0119
0120 template <typename Device, typename FormatTag>
0121 inline
0122 auto make_writer(Device& file, FormatTag const&,
0123     typename std::enable_if
0124     <
0125         mp11::mp_and
0126         <
0127             typename detail::is_adaptable_output_device<FormatTag, Device>::type,
0128             is_format_tag<FormatTag>
0129         >::value
0130     >::type* /*dummy*/ = nullptr)
0131     -> typename get_writer<Device, FormatTag>::type
0132 {
0133     return make_writer(file, image_write_info<FormatTag>());
0134 }
0135
0136 }} // namespace boost::gil
0137
0138 #endif