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       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      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           0 :     ColorType operator()( PixelType const& c ) const
      45             :     {
      46             :         return ColorTraits<ColorType>::fromGreyscale(
      47           0 :             vigra::NumericTraits<PixelType>::toPromote(c) *
      48           0 :             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           0 :     PixelType operator()( ColorType const& c ) const
      58             :     {
      59             :         return vigra::NumericTraits<PixelType>::toPromote(
      60           0 :             ColorTraits<ColorType>::toGreyscale(c)) *
      61             :             UsedRange /
      62           0 :             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: */