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