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/*
Copyright 2009 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_IS_ALLOWED_HPP
#define BOOST_GIL_EXTENSION_IO_BMP_DETAIL_IS_ALLOWED_HPP
////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief
/// \author Christian Henning \n
///
/// \date 2008 \n
///
////////////////////////////////////////////////////////////////////////////////////////
namespace boost { namespace gil { namespace detail {
template< typename View >
bool is_allowed( const image_read_info< bmp_tag >& info
, mpl::true_ // is read_and_no_convert
)
{
bmp_bits_per_pixel::type src_bits_per_pixel = 0;
switch( info._bits_per_pixel )
{
case 1:
case 4:
case 8:
{
if( info._header_size == bmp_header_size::_win32_info_size
&& info._compression != bmp_compression::_rle8
&& info._compression != bmp_compression::_rle4
)
{
src_bits_per_pixel = 32;
}
else
{
src_bits_per_pixel = 24;
}
break;
}
case 15:
case 16:
{
src_bits_per_pixel = 24;
break;
}
case 24:
case 32:
{
src_bits_per_pixel = info._bits_per_pixel;
break;
}
default:
{
io_error( "Pixel size not supported." );
}
}
typedef typename channel_traits< typename element_type< typename View::value_type >::type >::value_type channel_t;
bmp_bits_per_pixel::type dst_bits_per_pixel = detail::unsigned_integral_num_bits< channel_t >::value
* num_channels< View >::value;
return ( dst_bits_per_pixel == src_bits_per_pixel );
}
template< typename View >
bool is_allowed( const image_read_info< bmp_tag >& /* info */
, mpl::false_ // is read_and_convert
)
{
return true;
}
} // namespace detail
} // namespace gil
} // namespace boost
#endif
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