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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_PIXELFORMATADAPTERS_HXX
      21             : #define INCLUDED_BASEBMP_PIXELFORMATADAPTERS_HXX
      22             : 
      23             : #include <basebmp/accessortraits.hxx>
      24             : #include <basebmp/accessoradapters.hxx>
      25             : 
      26             : #include <vigra/metaprogramming.hxx>
      27             : 
      28             : namespace basebmp
      29             : {
      30             : 
      31             : // convenience functionality, providing everything necessary for a new
      32             : // pixel format. simply plug in two conversion functors from/to a
      33             : // common color format.
      34             : 
      35             : /** Accessor selection metafunction, used to wrap a given accessor
      36             :     with one converting between the pixel and color types
      37             : 
      38             :     Use the nested template's typedef type, to retrieve an
      39             :     AccessorAdapter which operates on a pixel value accessor, and
      40             :     provides color values to the outside.
      41             : 
      42             :     Nested like this, to avoid template template parameters at other
      43             :     places: an instantiated version of AccessorSelector can be passed
      44             :     to other templates, which in turn can invoke the nested meta
      45             :     function.
      46             :  */
      47             : template< typename Getter,
      48             :           typename Setter > struct AccessorSelector
      49             : {
      50             :     template< typename Accessor > struct wrap_accessor
      51             :     {
      52             :         typedef UnaryFunctionAccessorAdapter< Accessor,
      53             :                                               Getter,
      54             :                                               Setter > type;
      55             :     };
      56             : };
      57             : 
      58             : 
      59             : 
      60             : /** Convert color value to pixel data type
      61             :  */
      62             : template< class Accessor, typename DataType > struct ColorConvert
      63             : {
      64           0 :     DataType operator()( const Accessor&               acc,
      65             :                          typename Accessor::value_type v ) const
      66             :     {
      67           0 :         return acc.setter(v);
      68             :     }
      69             : };
      70             : 
      71             : 
      72             : 
      73             : /** Macro generates partial specialization for color-conversion
      74             :     UnaryFunctionAccessorAdapter, and the given getter/setter functors
      75             :  */
      76             : #define BASEBMP_SPECIALIZE_ACCESSORTRAITS(Getter,Setter)          \
      77             : template< class Accessor > struct AccessorTraits<                 \
      78             :     UnaryFunctionAccessorAdapter< Accessor,                       \
      79             :                                   Getter,                         \
      80             :                                   Setter > >                      \
      81             : {                                                                 \
      82             :     typedef typename Accessor::value_type          data_type;     \
      83             :     typedef UnaryFunctionAccessorAdapter<                         \
      84             :         Accessor,                                                 \
      85             :         Getter,                                                   \
      86             :         Setter >                                   accessor_type; \
      87             :     typedef typename accessor_type::value_type     value_type;    \
      88             :     typedef ColorConvert< accessor_type,                          \
      89             :                           data_type >              color_lookup;  \
      90             :     typedef Accessor                               raw_accessor;  \
      91             :     typedef vigra::VigraFalseType                  xor_accessor;  \
      92             :     template< class MaskAccessor,                                 \
      93             :               class Iterator,                                     \
      94             :               class MaskIterator > struct          masked_accessor\
      95             :     { typedef vigra::VigraFalseType type; };                      \
      96             : }
      97             : 
      98             : } // namespace basebmp
      99             : 
     100             : #endif /* INCLUDED_BASEBMP_PIXELFORMATADAPTERS_HXX */
     101             : 
     102             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */