/*
    Copyright 2008 Christian Henning
    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).
*/

/*************************************************************************************************/

#ifndef BOOST_GIL_EXTENSION_IO_BMP_DETAIL_SUPPORTED_TYPES_HPP
#define BOOST_GIL_EXTENSION_IO_BMP_DETAIL_SUPPORTED_TYPES_HPP

////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief 
/// \author Christian Henning \n
///
/// \date   2008 \n
///
////////////////////////////////////////////////////////////////////////////////////////

#include <boost/mpl/not.hpp>
#include <boost/type_traits/is_same.hpp>

#include <boost/gil/channel.hpp>
#include <boost/gil/color_base.hpp>
#include <boost/gil/bit_aligned_pixel_reference.hpp>
#include <boost/gil/packed_pixel.hpp>

#include <boost/gil/io/base.hpp>


namespace boost { namespace gil { namespace detail {

// Read support

template< typename Channel
        , typename ColorSpace
        >
struct bmp_read_support : read_support_false
{
    static const bmp_bits_per_pixel::type bpp = 0;
};

template< typename BitField
        , bool     Mutable
        >
struct bmp_read_support< packed_dynamic_channel_reference< BitField
                                                         , 1
                                                         , Mutable
                                                         >
                       , gray_t
                       > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 1;
};

template< typename BitField
        , bool     Mutable
        >
struct bmp_read_support< packed_dynamic_channel_reference< BitField
                                                         , 4
                                                         , Mutable
                                                         >
                       , gray_t
                       > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 4;
};


template<>
struct bmp_read_support<uint8_t
                       , gray_t
                       > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 8;
};
                      


template<>
struct bmp_read_support<uint8_t
                       , rgb_t
                       > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 24;
};


template<>
struct bmp_read_support<uint8_t
                       , rgba_t
                       > : read_support_true
{
    static const bmp_bits_per_pixel::type bpp = 32;
};


// Write support

template< typename Channel
        , typename ColorSpace
        >
struct bmp_write_support : write_support_false
{};

template<>
struct bmp_write_support<uint8_t
                        , rgb_t
                        > : write_support_true {};

template<>
struct bmp_write_support<uint8_t
                        , rgba_t
                        > : write_support_true {};

} // namespace detail


template< typename Pixel >
struct is_read_supported< Pixel
                        , bmp_tag
                        >
    : mpl::bool_< detail::bmp_read_support< typename channel_type< Pixel >::type
                                          , typename color_space_type< Pixel >::type
                                          >::is_supported 
                >
{
    typedef detail::bmp_read_support< typename channel_type< Pixel >::type
                                    , typename color_space_type< Pixel >::type
                                    > parent_t;

    static const typename bmp_bits_per_pixel::type bpp = parent_t::bpp;
};

template< typename Pixel >
struct is_write_supported< Pixel
                         , bmp_tag
                         >
    : mpl::bool_< detail::bmp_write_support< typename channel_type< Pixel >::type
                                           , typename color_space_type< Pixel >::type
                                           >::is_supported
                > {};

} // namespace gil
} // namespace boost


#endif
