102 lines
4 KiB
C++
102 lines
4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_BASEBMP_INC_PIXELFORMATADAPTERS_HXX
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#define INCLUDED_BASEBMP_INC_PIXELFORMATADAPTERS_HXX
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#include <accessortraits.hxx>
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#include <accessoradapters.hxx>
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#include <vigra/metaprogramming.hxx>
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namespace basebmp
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{
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// convenience functionality, providing everything necessary for a new
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// pixel format. simply plug in two conversion functors from/to a
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// common color format.
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/** Accessor selection metafunction, used to wrap a given accessor
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with one converting between the pixel and color types
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Use the nested template's typedef type, to retrieve an
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AccessorAdapter which operates on a pixel value accessor, and
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provides color values to the outside.
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Nested like this, to avoid template template parameters at other
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places: an instantiated version of AccessorSelector can be passed
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to other templates, which in turn can invoke the nested meta
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function.
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*/
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template< typename Getter,
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typename Setter > struct AccessorSelector
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{
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template< typename Accessor > struct wrap_accessor
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{
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typedef UnaryFunctionAccessorAdapter< Accessor,
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Getter,
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Setter > type;
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};
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};
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/** Convert color value to pixel data type
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*/
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template< class Accessor, typename DataType > struct ColorConvert
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{
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DataType operator()( const Accessor& acc,
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typename Accessor::value_type v ) const
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{
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return acc.setter(v);
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}
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};
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/** Macro generates partial specialization for color-conversion
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UnaryFunctionAccessorAdapter, and the given getter/setter functors
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*/
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#define BASEBMP_SPECIALIZE_ACCESSORTRAITS(Getter,Setter) \
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template< class Accessor > struct AccessorTraits< \
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UnaryFunctionAccessorAdapter< Accessor, \
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Getter, \
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Setter > > \
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{ \
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typedef typename Accessor::value_type data_type; \
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typedef UnaryFunctionAccessorAdapter< \
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Accessor, \
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Getter, \
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Setter > accessor_type; \
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typedef typename accessor_type::value_type value_type; \
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typedef ColorConvert< accessor_type, \
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data_type > color_lookup; \
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typedef Accessor raw_accessor; \
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typedef vigra::VigraFalseType xor_accessor; \
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template< class MaskAccessor, \
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class Iterator, \
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class MaskIterator > struct masked_accessor\
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{ typedef vigra::VigraFalseType type; }; \
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}
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} // namespace basebmp
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#endif /* INCLUDED_BASEBMP_INC_PIXELFORMATADAPTERS_HXX */
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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