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File://usr/include/boost/gil/io/read_and_convert_view.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_AND_CONVERT_VIEW_HPP
#define BOOST_GIL_IO_READ_AND_CONVERT_VIEW_HPP

#include <boost/gil/io/base.hpp>
#include <boost/gil/io/conversion_policies.hpp>
#include <boost/gil/io/device.hpp>
#include <boost/gil/io/get_reader.hpp>
#include <boost/gil/io/path_spec.hpp>
#include <boost/gil/detail/mp11.hpp>

#include <type_traits>

namespace boost{ namespace gil {

/// \ingroup IO

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param reader    An image reader.
/// \param img       The image in which the data is read into.
/// \param settings  Specifies read settings depending on the image format.
/// \param cc        Color converter function object.
/// \throw std::ios_base::failure
template <typename Reader, typename View>
inline
void read_and_convert_view(Reader& reader, View const& view,
    typename std::enable_if
    <
        mp11::mp_and
        <
            detail::is_reader<Reader>,
            is_format_tag<typename Reader::format_tag_t>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    reader.check_image_size(view.dimensions());
    reader.init_view(view, reader._settings);
    reader.apply(view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file      It's a device. Must satisfy is_input_device metafunction.
/// \param view      The image view in which the data is read into.
/// \param settings  Specifies read settings depending on the image format.
/// \param cc        Color converter function object.
/// \throw std::ios_base::failure
template <typename Device, typename View, typename ColorConverter, typename FormatTag>
inline
void read_and_convert_view(
    Device& device,
    View const& view,
    image_read_settings<FormatTag> const& settings,
    ColorConverter const& cc,
    typename std::enable_if
    <
        mp11::mp_and
        <
            detail::is_read_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<ColorConverter>;
    using reader_t = typename get_reader<Device, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(device, settings, read_and_convert_t{cc});
    read_and_convert_view(reader, view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file_name File name. Must satisfy is_supported_path_spec metafunction.
/// \param view      The image view in which the data is read into.
/// \param settings  Specifies read settings depending on the image format.
/// \param cc        Color converter function object.
/// \throw std::ios_base::failure
template <typename String, typename View, typename ColorConverter, typename FormatTag>
inline
void read_and_convert_view(
    String const& file_name,
    View const& view,
    image_read_settings<FormatTag> const& settings,
    ColorConverter const& cc,
    typename std::enable_if
    <
        mp11::mp_and
        <
            is_format_tag<FormatTag>,
            detail::is_supported_path_spec<String>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<ColorConverter>;
    using reader_t = typename get_reader<String, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(file_name, settings, read_and_convert_t{cc});
    read_and_convert_view(reader, view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file_name File name. Must satisfy is_supported_path_spec metafunction.
/// \param view      The image view in which the data is read into.
/// \param cc        Color converter function object.
/// \param tag       Defines the image format. Must satisfy is_format_tag metafunction.
/// \throw std::ios_base::failure
template <typename String, typename View, typename ColorConverter, typename FormatTag>
inline
void read_and_convert_view(
    String const& file_name,
    View const& view,
    ColorConverter const& cc,
    FormatTag const& tag,
    typename std::enable_if
    <
        mp11::mp_and
        <
            is_format_tag<FormatTag>,
            detail::is_supported_path_spec<String>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<ColorConverter>;
    using reader_t = typename get_reader<String, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(file_name, tag, read_and_convert_t{cc});
    read_and_convert_view(reader, view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file It's a device. Must satisfy is_input_device metafunction or is_adaptable_input_device.
/// \param view The image view in which the data is read into.
/// \param cc   Color converter function object.
/// \param tag  Defines the image format. Must satisfy is_format_tag metafunction.
/// \throw std::ios_base::failure
template <typename Device, typename View, typename ColorConverter, typename FormatTag>
inline
void read_and_convert_view(
    Device& device,
    View const& view,
    ColorConverter const& cc,
    FormatTag const& tag,
    typename std::enable_if
    <
        mp11::mp_and
        <
            detail::is_read_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<ColorConverter>;
    using reader_t = typename get_reader<Device, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(device, tag, read_and_convert_t{cc});
    read_and_convert_view(reader, view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file_name File name. Must satisfy is_supported_path_spec metafunction.
/// \param view      The image view in which the data is read into.
/// \param settings  Specifies read settings depending on the image format.
/// \throw std::ios_base::failure
template <typename String, typename View, typename FormatTag>
inline
void read_and_convert_view(
    String const& file_name,
    View const& view,
    image_read_settings<FormatTag> const& settings,
    typename std::enable_if
    <
        mp11::mp_and
        <
            is_format_tag<FormatTag>,
            detail::is_supported_path_spec<String>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<default_color_converter>;
    using reader_t = typename get_reader<String, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(file_name, settings, read_and_convert_t{});
    read_and_convert_view(reader, view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file      It's a device. Must satisfy is_input_device metafunction or is_adaptable_input_device.
/// \param view      The image view in which the data is read into.
/// \param settings  Specifies read settings depending on the image format.
/// \throw std::ios_base::failure
template <typename Device, typename View, typename FormatTag>
inline
void read_and_convert_view(
    Device& device,
    View const& view,
    image_read_settings<FormatTag> const& settings,
    typename std::enable_if
    <
        mp11::mp_and
        <
            detail::is_read_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<default_color_converter>;
    using reader_t = typename get_reader<Device, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(device, settings, read_and_convert_t{});
    read_and_convert_view(reader, view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file_name File name. Must satisfy is_supported_path_spec metafunction.
/// \param view      The image view in which the data is read into.
/// \param tag       Defines the image format. Must satisfy is_format_tag metafunction.
/// \throw std::ios_base::failure
template <typename String, typename View, typename FormatTag>
inline
void read_and_convert_view(
    String const& file_name,
    View const& view,
    FormatTag const& tag,
    typename std::enable_if
    <
        mp11::mp_and
        <
            is_format_tag<FormatTag>,
            detail::is_supported_path_spec<String>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<default_color_converter>;
    using reader_t = typename get_reader<String, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(file_name, tag, read_and_convert_t{});
    read_and_convert_view(reader, view);
}

/// \brief Reads and color-converts an image view. No memory is allocated.
/// \param file It's a device. Must satisfy is_input_device metafunction or is_adaptable_input_device.
/// \param view The image view in which the data is read into.
/// \param tag  Defines the image format. Must satisfy is_format_tag metafunction.
/// \throw std::ios_base::failure
template <typename Device, typename View, typename FormatTag>
inline
void read_and_convert_view(
    Device& device,
    View const& view,
    FormatTag const& tag,
    typename std::enable_if
    <
        mp11::mp_and
        <
            detail::is_read_device<FormatTag, Device>,
            is_format_tag<FormatTag>
        >::value
    >::type* /*dummy*/ = nullptr)
{
    using read_and_convert_t = detail::read_and_convert<default_color_converter>;
    using reader_t = typename get_reader<Device, FormatTag, read_and_convert_t>::type;

    reader_t reader = make_reader(device, tag, read_and_convert_t{});
    read_and_convert_view(reader, view);
}

}} // namespace boost::gill

#endif

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