include/basebmp/greylevelformats.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_BASEBMP_GREYLEVELFORMATS_HXX
  21 #define INCLUDED_BASEBMP_GREYLEVELFORMATS_HXX
  22
  23 #include <basebmp/color.hxx>
  24 #include <basebmp/colortraits.hxx>
  25 #include <basebmp/accessor.hxx>
  26 #include <basebmp/pixeliterator.hxx>
  27 #include <basebmp/packedpixeliterator.hxx>
  28 #include <basebmp/pixelformatadapters.hxx>
  29 #include <basebmp/metafunctions.hxx>
  30
  31 #include <vigra/numerictraits.hxx>
  32 #include <vigra/metaprogramming.hxx>
  33
  34 #include <functional>
  35
  36 namespace basebmp
  37 {
  38
  39 template< typename PixelType,
  40           typename ColorType,
  41           int      UsedRange > struct GreylevelGetter :
  42         public std::unary_function<PixelType, ColorType>
  43 {
  44     ColorType operator()( PixelType const& c ) const
  45     {
  46         return ColorTraits<ColorType>::fromGreyscale(
  47             vigra::NumericTraits<PixelType>::toPromote(c) *
  48             vigra::NumericTraits<PixelType>::maxConst / UsedRange );
  49     }
  50 };
  51
  52 template< typename PixelType,
  53           typename ColorType,
  54           int      UsedRange > struct GreylevelSetter :
  55     public std::unary_function<ColorType, PixelType>
  56 {
  57     PixelType operator()( ColorType const& c ) const
  58     {
  59         return vigra::NumericTraits<PixelType>::toPromote(
  60             ColorTraits<ColorType>::toGreyscale(c)) *
  61             UsedRange /
  62             vigra::NumericTraits<PixelType>::maxConst;
  63     }
  64 };
  65
  66 //-----------------------------------------------------------------------------
  67
  68 template< class Iterator,
  69           class Accessor,
  70           int   UsedRange > struct PixelFormatTraitsTemplate_Greylevel
  71 {
  72     typedef typename Iterator::value_type       pixel_type;
  73
  74     typedef GreylevelGetter<pixel_type,
  75                             Color,
  76                             UsedRange>          getter_type;
  77     typedef GreylevelSetter<pixel_type,
  78                             Color,
  79                             UsedRange>          setter_type;
  80
  81     typedef Iterator                            iterator_type;
  82     typedef Accessor                            raw_accessor_type;
  83     typedef AccessorSelector<
  84         getter_type,
  85         setter_type >                           accessor_selector;
  86 };
  87
  88 template< int BitsPerPixel,
  89           bool MsbFirst > struct PixelFormatTraitsTemplate_PackedGreylevel :
  90     public PixelFormatTraitsTemplate_Greylevel<
  91                PackedPixelIterator< sal_uInt8,
  92                                     BitsPerPixel,
  93                                     true >,
  94                NonStandardAccessor< sal_uInt8 >,
  95                (1UL << BitsPerPixel)-1 >
  96 {};
  97
  98 //-----------------------------------------------------------------------------
  99
 100 // 1bpp MSB
 101 typedef PixelFormatTraitsTemplate_PackedGreylevel<1, true> PixelFormatTraits_GREY1_MSB;
 102
 103 // 1bpp LSB
 104 typedef PixelFormatTraitsTemplate_PackedGreylevel<1, false> PixelFormatTraits_GREY1_LSB;
 105 BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_GREY1_MSB::getter_type,
 106                                   PixelFormatTraits_GREY1_MSB::setter_type);
 107
 108
 109 // 4bpp MSB
 110 typedef PixelFormatTraitsTemplate_PackedGreylevel<4, true> PixelFormatTraits_GREY4_MSB;
 111
 112 // 4bpp LSB
 113 typedef PixelFormatTraitsTemplate_PackedGreylevel<4, false> PixelFormatTraits_GREY4_LSB;
 114 BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_GREY4_MSB::getter_type,
 115                                   PixelFormatTraits_GREY4_MSB::setter_type);
 116
 117 // 8bpp
 118 typedef PixelFormatTraitsTemplate_Greylevel<
 119     PixelIterator< sal_uInt8 >,
 120     StandardAccessor< sal_uInt8 >,
 121     255 >                                                   PixelFormatTraits_GREY8;
 122 BASEBMP_SPECIALIZE_ACCESSORTRAITS(PixelFormatTraits_GREY8::getter_type,
 123                                   PixelFormatTraits_GREY8::setter_type);
 124
 125 } // namespace basebmp
 126
 127 #endif /* INCLUDED_BASEBMP_GREYLEVELFORMATS_HXX */
 128
 129 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */