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read_image_info.hpp
1//
2// Copyright 2007-2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev
3//
4// Distributed under the Boost Software License, Version 1.0
5// See accompanying file LICENSE_1_0.txt or copy at
6// http://www.boost.org/LICENSE_1_0.txt
7//
8#ifndef BOOST_GIL_IO_READ_IMAGE_INFO_HPP
9#define BOOST_GIL_IO_READ_IMAGE_INFO_HPP
10
11#include <boost/gil/io/base.hpp>
12#include <boost/gil/io/device.hpp>
13#include <boost/gil/io/get_reader.hpp>
14#include <boost/gil/io/path_spec.hpp>
15#include <boost/gil/detail/mp11.hpp>
16
17#include <type_traits>
18
19 namespace boost{ namespace gil {
20
22
28 template <typename Device, typename FormatTag>
29 inline
30 auto read_image_info(Device& file, image_read_settings<FormatTag> const& settings,
31 typename std::enable_if
32 <
33 mp11::mp_and
34 <
35 detail::is_adaptable_input_device<FormatTag, Device>,
36 is_format_tag<FormatTag>
37 >::value
38 >::type* /*dummy*/ = nullptr)
39 -> typename get_reader_backend<Device, FormatTag>::type
40{
41 return make_reader_backend(file, settings);
42}
43
49 template <typename Device, typename FormatTag>
50 inline
51 auto read_image_info(Device& file, FormatTag const&,
52 typename std::enable_if
53 <
54 mp11::mp_and
55 <
56 detail::is_adaptable_input_device<FormatTag, Device>,
57 is_format_tag<FormatTag>
58 >::value
59 >::type* /*dummy*/ = nullptr)
60 -> typename get_reader_backend<Device, FormatTag>::type
61{
62 return read_image_info(file, image_read_settings<FormatTag>());
63}
64
70 template <typename String, typename FormatTag>
71 inline
72 auto read_image_info(
73 String const& file_name, image_read_settings<FormatTag> const& settings,
74 typename std::enable_if
75 <
76 mp11::mp_and
77 <
78 is_format_tag<FormatTag>,
79 detail::is_supported_path_spec<String>
80 >::value
81 >::type* /*dummy*/ = nullptr)
82 -> typename get_reader_backend<String, FormatTag>::type
83{
84 return make_reader_backend(file_name, settings);
85}
86
92 template <typename String, typename FormatTag>
93 inline
94 auto read_image_info(String const& file_name, FormatTag const&,
95 typename std::enable_if
96 <
97 mp11::mp_and
98 <
99 is_format_tag<FormatTag>,
100 detail::is_supported_path_spec<String>
101 >::value
102 >::type* /*dummy*/ = nullptr)
103 -> typename get_reader_backend<String, FormatTag>::type
104{
105 return read_image_info(file_name, image_read_settings<FormatTag>());
106}
107
108}} // namespace boost::gil
109
110#endif
boost::gil::read_image_info
auto read_image_info(Device &file, image_read_settings< FormatTag > const &settings, typename std::enable_if< mp11::mp_and< detail::is_adaptable_input_device< FormatTag, Device >, is_format_tag< FormatTag > >::value >::type *=nullptr) -> typename get_reader_backend< Device, FormatTag >::type
Returns the image format backend. Backend is format specific.
Definition: read_image_info.hpp:30
boost
defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)
Definition: algorithm.hpp:36
boost::gil::get_reader_backend
Helper metafunction to generate image backend type.
Definition: get_reader.hpp:115