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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: accessoradapters.hxx,v $
*
* $Revision: 1.2 $
*
* last change: $Author: thb $ $Date: 2006-05-31 10:12:11 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#ifndef INCLUDED_BASEBMP_ACCESSORADAPTERS_HXX
#define INCLUDED_BASEBMP_ACCESSORADAPTERS_HXX
#include "metafunctions.hxx"
#include "packedpixeliterator.hxx"
#include "paletteimageaccessor.hxx"
namespace basebmp
{
/** Interpose given accessor's set methods with a binary function,
taking both old and new value.
*/
template< class WrappedAccessor, typename Functor > class BinarySetterFunctionAccessorAdapter :
public WrappedAccessor
{
private:
Functor maFunctor;
public:
BinarySetterFunctionAccessorAdapter() :
WrappedAccessor(),
maFunctor()
{}
explicit BinarySetterFunctionAccessorAdapter( WrappedAccessor accessor ) :
WrappedAccessor( accessor ),
maFunctor()
{}
BinarySetterFunctionAccessorAdapter( WrappedAccessor accessor,
Functor functor ) :
WrappedAccessor( accessor ),
maFunctor( functor )
{}
template< typename V, class Iterator >
void set(V const& value, Iterator const& i) const
{
WrappedAccessor::set(
maFunctor(WrappedAccessor::operator()(i),
value),
i );
}
template< typename V, class Iterator, class Difference >
void set(V const& value, Iterator const& i, Difference const& diff) const
{
WrappedAccessor::set(
maFunctor(WrappedAccessor::operator()(i,diff),
value),
i,
diff );
}
};
/** Read from two input iterators, pipe that through given functor, and write result
to the first iterator
Note: iterator type is fixed, to facilitate type-safe mask
optimizations (see below)
*/
template< class WrappedAccessor1,
class WrappedAccessor2,
class Iterator1,
class Iterator2,
typename Functor > class BinaryInputAccessorAdapter
{
private:
WrappedAccessor1 ma1stAccessor;
WrappedAccessor2 ma2ndAccessor;
Functor maFunctor;
public:
typedef typename WrappedAccessor1::value_type value_type;
BinaryInputAccessorAdapter() :
ma1stAccessor(),
ma2ndAccessor(),
maFunctor()
{}
explicit BinaryInputAccessorAdapter( WrappedAccessor1 accessor1 ) :
ma1stAccessor( accessor1 ),
ma2ndAccessor(),
maFunctor()
{}
BinaryInputAccessorAdapter( WrappedAccessor1 accessor1,
WrappedAccessor2 accessor2 ) :
ma1stAccessor( accessor1 ),
ma2ndAccessor( accessor2 ),
maFunctor()
{}
BinaryInputAccessorAdapter( WrappedAccessor1 accessor1,
WrappedAccessor2 accessor2,
Functor func ) :
ma1stAccessor( accessor1 ),
ma2ndAccessor( accessor2 ),
maFunctor( func )
{}
value_type operator()(Iterator1 const& i, Iterator2 const& j) const
{
return maFunctor(ma1stAccessor(i),
ma2ndAccessor(j));
}
template< class Difference >
value_type operator()(Iterator1 const& i, Iterator2 const& j, Difference const& diff) const
{
return maFunctor(ma1stAccessor(i,diff),
ma2ndAccessor(j,diff));
}
template< typename V >
void set(V const& value, Iterator1 const& i, Iterator2 const& j) const
{
ma1stAccessor.set(
maFunctor(ma1stAccessor(i),
ma2ndAccessor(j)),
i );
}
template< typename V, class Difference >
void set(V const& value, Iterator1 const& i, Iterator2 const& j, Difference const& diff) const
{
ma1stAccessor.set(
maFunctor(ma1stAccessor(i,diff),
ma2ndAccessor(j,diff)),
i,
diff );
}
};
// Some common accessor wrappers
// ------------------------------------------------------------
// XOR
template< typename T > struct XorFunctor
{
T operator()( T v1, T v2 ) const { return v1 ^ v2; }
};
template< class WrappedAccessor > struct xorAccessor
{
typedef BinarySetterFunctionAccessorAdapter< WrappedAccessor,
XorFunctor< typename WrappedAccessor::value_type > >
type;
};
// Mask
template< typename T > struct MaskFunctor
{
/** Mask v with state of m
@return v, if m != 0, and vigra::NumericTraits<T>::zero
otherwise.
*/
T operator()( T v, T m ) const
{
// TODO(Q3): use traits to get unsigned type for T (if
// not already)
// mask will be 0, iff m == 0, and 1 otherwise
const T mask( static_cast<unsigned int>(m | -m) >> (sizeof(unsigned int)*8 - 1) );
return mask*v;
}
};
// Faster mask (assuming mask accessor output is already either 0 or 1)
template< typename T > struct FastMaskFunctor
{
T operator()( T v, T m ) const
{
return m*v;
}
};
// Chosen function crucially depends on iterator - we can choose the
// faster direkt masking for 1bpp packed pixel iterators
template< class WrappedAccessor,
class MaskAccessor,
class Iterator,
class MaskIterator > struct maskedAccessor
{
typedef BinaryInputAccessorAdapter< WrappedAccessor,
MaskAccessor,
Iterator,
MaskIterator,
MaskFunctor< typename WrappedAccessor::value_type > >
type;
};
// partial specialization, to use fast 1bpp mask function for
// corresponding iterator type
template< class WrappedAccessor,
class MaskAccessor,
class Iterator > struct maskedAccessor< WrappedAccessor,
MaskAccessor,
Iterator,
PackedPixelIterator< typename MaskAccessor::data_type,
typename MaskAccessor::value_type,
1,
true > >
{
typedef BinaryInputAccessorAdapter< WrappedAccessor,
MaskAccessor,
Iterator,
PackedPixelIterator< typename MaskAccessor::data_type,
typename MaskAccessor::value_type,
1,
true >,
FastMaskFunctor< typename WrappedAccessor::value_type > >
type;
};
template< class WrappedAccessor,
class MaskAccessor,
class Iterator > struct maskedAccessor< WrappedAccessor,
MaskAccessor,
Iterator,
PackedPixelIterator< typename MaskAccessor::data_type,
typename MaskAccessor::value_type,
1,
false > >
{
typedef BinaryInputAccessorAdapter< WrappedAccessor,
MaskAccessor,
Iterator,
PackedPixelIterator< typename MaskAccessor::data_type,
typename MaskAccessor::value_type,
1,
false >,
FastMaskFunctor< typename WrappedAccessor::value_type > >
type;
};
} // namespace basebmp
#endif /* INCLUDED_BASEBMP_ACCESSORADAPTERS_HXX */
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