rgba.hpp

//
// Copyright 2005-2007 Adobe Systems Incorporated
//
// 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_RGBA_HPP
#define BOOST_GIL_RGBA_HPP

#include <boost/gil/planar_pixel_iterator.hpp>
#include <boost/gil/rgb.hpp>
#include <boost/gil/detail/mp11.hpp>

#include <cstddef>
#include <type_traits>

namespace boost { namespace gil {

struct alpha_t {};

using rgba_t =mp11::mp_list<red_t, green_t, blue_t, alpha_t>;

using rgba_layout_t = layout<rgba_t>;

using bgra_layout_t = layout<rgba_t, mp11::mp_list_c<int, 2, 1, 0, 3>>;

using argb_layout_t = layout<rgba_t, mp11::mp_list_c<int, 1, 2, 3, 0>>;

using abgr_layout_t = layout<rgba_t, mp11::mp_list_c<int, 3, 2, 1, 0>>;

template <typename IC>
inline
auto planar_rgba_view(
    std::size_t width, std::size_t height,
    IC r, IC g, IC b, IC a,
    std::ptrdiff_t rowsize_in_bytes)
    -> typename type_from_x_iterator<planar_pixel_iterator<IC, rgba_t> >::view_t
{
    using view_t = typename type_from_x_iterator<planar_pixel_iterator<IC, rgba_t>>::view_t;

    return RView(
        width, height,
        typename view_t::locator(
            planar_pixel_iterator<IC, rgba_t>(r, g, b, a),
            rowsize_in_bytes));
}

}} // namespace boost::gil

#endif