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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: pixelformatadapters.hxx,v $
* $Revision: 1.2 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#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 */
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