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#ifndef INCLUDED_BASEBMP_GREYLEVELFORMATS_HXX
#define INCLUDED_BASEBMP_GREYLEVELFORMATS_HXX

#include <basebmp/color.hxx>
#include <basebmp/colortraits.hxx>
#include <basebmp/accessor.hxx>
#include <basebmp/pixeliterator.hxx>
#include <basebmp/packedpixeliterator.hxx>
#include <basebmp/pixelformatadapters.hxx>
#include <basebmp/metafunctions.hxx>

#include <vigra/numerictraits.hxx>
#include <vigra/metaprogramming.hxx>

#include <functional>

namespace basebmp
{

template< typename PixelType,
          typename ColorType,
          int      UsedRange > struct GreylevelGetter :
        public std::unary_function<PixelType, ColorType>
{
    ColorType operator()( PixelType const& c ) const
    {
        return ColorTraits<ColorType>::fromGreyscale(
            vigra::NumericTraits<PixelType>::toPromote(c) *
            vigra::NumericTraits<PixelType>::maxConst / UsedRange );
    }
};

template< typename PixelType,
          typename ColorType,
          int      UsedRange > struct GreylevelSetter :
    public std::unary_function<ColorType, PixelType>
{
    PixelType operator()( ColorType const& c ) const
    {
        return vigra::NumericTraits<PixelType>::toPromote(
            ColorTraits<ColorType>::toGreyscale(c)) *
            UsedRange /
            vigra::NumericTraits<PixelType>::maxConst;
    }
};

//-----------------------------------------------------------------------------

template< class Iterator,
          class Accessor,
          int   UsedRange > struct PixelFormatTraitsTemplate_Greylevel
{
    typedef typename Iterator::value_type       pixel_type;

    typedef GreylevelGetter<pixel_type,
                            Color,
                            UsedRange>          getter_type;
    typedef GreylevelSetter<pixel_type,
                            Color,
                            UsedRange>          setter_type;

    typedef Iterator                            iterator_type;
    typedef Accessor                            raw_accessor_type;
    typedef AccessorSelector<
        getter_type,
        setter_type >                           accessor_selector;
};

template< int BitsPerPixel,
          bool MsbFirst > struct PixelFormatTraitsTemplate_PackedGreylevel :
    public PixelFormatTraitsTemplate_Greylevel<
               PackedPixelIterator< sal_uInt8,
                                    BitsPerPixel,
                                    true >,
               NonStandardAccessor< sal_uInt8 >,
               (1UL << BitsPerPixel)-1 >
{};

//-----------------------------------------------------------------------------

// 1bpp MSB
typedef PixelFormatTraitsTemplate_PackedGreylevel<1, true> PixelFormatTraits_GREY1_MSB;

// 1bpp LSB
typedef PixelFormatTraitsTemplate_PackedGreylevel<1, false> PixelFormatTraits_GREY1_LSB;
BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_GREY1_MSB::getter_type,
                                  PixelFormatTraits_GREY1_MSB::setter_type);


// 4bpp MSB
typedef PixelFormatTraitsTemplate_PackedGreylevel<4, true> PixelFormatTraits_GREY4_MSB;

// 4bpp LSB
typedef PixelFormatTraitsTemplate_PackedGreylevel<4, false> PixelFormatTraits_GREY4_LSB;
BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_GREY4_MSB::getter_type,
                                  PixelFormatTraits_GREY4_MSB::setter_type);

// 8bpp
typedef PixelFormatTraitsTemplate_Greylevel<
    PixelIterator< sal_uInt8 >,
    StandardAccessor< sal_uInt8 >,
    255 >                                                   PixelFormatTraits_GREY8;
BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_GREY8::getter_type,
                                  PixelFormatTraits_GREY8::setter_type);

} // namespace basebmp

#endif /* INCLUDED_BASEBMP_GREYLEVELFORMATS_HXX */