rgba.hpp

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/*
    Copyright 2005-2007 Adobe Systems Incorporated
   
    Use, modification and distribution are subject to 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).

    See http://opensource.adobe.com/gil for most recent version including documentation.
*/
/*************************************************************************************************/

#ifndef GIL_RGBA_H
#define GIL_RGBA_H


#include <cstddef>
#include "gil_config.hpp"
#include <boost/mpl/contains.hpp>
#include "rgb.hpp"
#include "planar_pixel_iterator.hpp"

namespace boost { namespace gil {

struct alpha_t {};    

typedef mpl::vector4<red_t,green_t,blue_t,alpha_t> rgba_t;

typedef layout<rgba_t> rgba_layout_t;
typedef layout<rgba_t, mpl::vector4_c<int,2,1,0,3> > bgra_layout_t;
typedef layout<rgba_t, mpl::vector4_c<int,1,2,3,0> > argb_layout_t;
typedef layout<rgba_t, mpl::vector4_c<int,3,2,1,0> > abgr_layout_t;

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

} }  // namespace boost::gil

#endif