175 lines
5.9 KiB
C++
175 lines
5.9 KiB
C++
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//
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// Copyright 2007-2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev
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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_READ_VIEW_HPP
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#define BOOST_GIL_IO_READ_VIEW_HPP
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#include <boost/gil/io/base.hpp>
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#include <boost/gil/io/conversion_policies.hpp>
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#include <boost/gil/io/device.hpp>
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#include <boost/gil/io/get_reader.hpp>
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#include <boost/gil/io/path_spec.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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/// \ingroup IO
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/// \brief Reads an image view without conversion. No memory is allocated.
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/// \param reader An image reader.
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/// \param view The image view in which the data is read into.
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/// \param settings Specifies read settings depending on the image format.
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/// \throw std::ios_base::failure
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template <typename Reader, typename View>
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inline
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void read_view(Reader reader, View const& view,
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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_reader<Reader>,
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typename is_format_tag<typename Reader::format_tag_t>::type,
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typename is_read_supported
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<
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typename get_pixel_type<View>::type,
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typename Reader::format_tag_t
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>::type
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>::value
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>::type* /*dummy*/ = nullptr)
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{
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reader.check_image_size(view.dimensions());
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reader.init_view(view, reader._settings);
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reader.apply(view);
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}
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/// \brief Reads an image view without conversion. No memory is allocated.
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/// \param file It's a device. Must satisfy is_input_device metafunction.
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/// \param view The image view in which the data is read into.
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/// \param settings Specifies read settings depending on the image format.
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/// \throw std::ios_base::failure
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template <typename Device, typename View, typename FormatTag>
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inline
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void read_view(
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Device& file,
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View const& view,
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image_read_settings<FormatTag> const& settings,
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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_read_device<FormatTag, Device>,
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typename is_format_tag<FormatTag>::type,
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typename is_read_supported
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<
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typename get_pixel_type<View>::type,
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FormatTag
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>::type
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>::value
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>::type* /*dummy*/ = nullptr)
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{
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using reader_t =
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typename get_reader<Device, FormatTag, detail::read_and_no_convert>::type;
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reader_t reader = make_reader(file, settings, detail::read_and_no_convert());
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read_view(reader, view);
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}
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/// \brief Reads an image view without conversion. No memory is allocated.
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/// \param file It's a device. Must satisfy is_input_device metafunction or is_adaptable_input_device.
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/// \param view The image view in which the data is read into.
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/// \param tag Defines the image format. Must satisfy is_format_tag metafunction.
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/// \throw std::ios_base::failure
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template <typename Device, typename View, typename FormatTag>
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inline
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void read_view(Device& file, View const& view, FormatTag const& tag,
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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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typename is_format_tag<FormatTag>::type,
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detail::is_read_device<FormatTag, Device>,
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typename is_read_supported
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<
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typename get_pixel_type<View>::type,
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FormatTag
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>::type
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>::value>::type* /*dummy*/ = nullptr)
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{
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using reader_t =
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typename get_reader<Device, FormatTag, detail::read_and_no_convert>::type;
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reader_t reader = make_reader(file, tag, detail::read_and_no_convert());
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read_view(reader, view);
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}
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/// \brief Reads an image view without conversion. No memory is allocated.
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/// \param file_name File name. Must satisfy is_supported_path_spec metafunction.
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/// \param view The image view in which the data is read into.
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/// \param settings Specifies read settings depending on the image format.
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/// \throw std::ios_base::failure
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template <typename String, typename View, typename FormatTag>
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inline
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void read_view(
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String const& file_name,
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View const& view,
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image_read_settings<FormatTag> const& settings,
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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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typename detail::is_supported_path_spec<String>::type,
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typename is_format_tag<FormatTag>::type,
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typename is_read_supported
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<
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typename get_pixel_type<View>::type,
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FormatTag
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>::type
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>::value
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>::type* /*dummy*/ = nullptr)
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{
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using reader_t =
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typename get_reader<String, FormatTag, detail::read_and_no_convert>::type;
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reader_t reader = make_reader(file_name, settings, detail::read_and_no_convert());
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read_view(reader, view);
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}
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/// \brief Reads an image view without conversion. No memory is allocated.
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/// \param file_name File name. Must satisfy is_supported_path_spec metafunction.
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/// \param view The image view in which the data is read into.
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/// \param tag Defines the image format. Must satisfy is_format_tag metafunction.
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/// \throw std::ios_base::failure
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template <typename String, typename View, typename FormatTag>
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inline
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void read_view(String const& file_name, View const& view, FormatTag const& tag,
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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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typename detail::is_supported_path_spec<String>::type,
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typename is_format_tag<FormatTag>::type,
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typename is_read_supported
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<
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typename get_pixel_type<View>::type,
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FormatTag
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>::type
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>::value
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>::type* /*dummy*/ = nullptr)
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{
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using reader_t =
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typename get_reader<String, FormatTag, detail::read_and_no_convert>::type;
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reader_t reader = make_reader(file_name, tag, detail::read_and_no_convert());
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read_view(reader, view);
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}
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}} // namespace boost::gil
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#endif
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