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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* 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_PALETTEIMAGEACCESSOR_HXX
#define INCLUDED_BASEBMP_PALETTEIMAGEACCESSOR_HXX
#include <basebmp/colortraits.hxx>
#include <basebmp/accessortraits.hxx>
#include <vigra/numerictraits.hxx>
#include <vigra/metaprogramming.hxx>
#include <algorithm>
#include <functional>
namespace basebmp
{
/** Access pixel data via palette indirection
@tpl Accessor
Raw accessor, to be used to actually access the pixel values
@tpl ColorType
The color value type to use - e.g. the palette is an array of that
type
*/
template< class Accessor, typename ColorType > class PaletteImageAccessor
{
public:
typedef typename Accessor::value_type data_type;
typedef ColorType value_type;
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
// making all members public, if no member template friends
private:
template<class A, typename C> friend class PaletteImageAccessor;
#endif
Accessor maAccessor;
const value_type* mpPalette;
std::size_t mnNumEntries;
public:
PaletteImageAccessor() :
maAccessor(),
mpPalette(0),
mnNumEntries(0)
{}
template< class A > explicit
PaletteImageAccessor( PaletteImageAccessor<A,ColorType> const& rSrc ) :
maAccessor( rSrc.maAccessor ),
mpPalette( rSrc.mpPalette ),
mnNumEntries( rSrc.mnNumEntries )
{}
PaletteImageAccessor( const value_type* pPalette,
std::size_t numEntries ) :
maAccessor(),
mpPalette(pPalette),
mnNumEntries(numEntries)
{}
template< class T > PaletteImageAccessor( T accessor,
const value_type* pPalette,
std::size_t numEntries ) :
maAccessor(accessor),
mpPalette(pPalette),
mnNumEntries(numEntries)
{}
// -------------------------------------------------------
Accessor const& getWrappedAccessor() const { return maAccessor; }
Accessor& getWrappedAccessor() { return maAccessor; }
// -------------------------------------------------------
data_type lookup(value_type const& v) const
{
// TODO(P3): use table-based/octree approach here!
const value_type* best_entry;
const value_type* palette_end( mpPalette+mnNumEntries );
if( (best_entry=std::find( mpPalette, palette_end, v)) != palette_end )
return best_entry-mpPalette;
const value_type* curr_entry( mpPalette );
best_entry = curr_entry;
while( curr_entry != palette_end )
{
if( ColorTraits<value_type>::distance(*curr_entry,
*best_entry)
> ColorTraits<value_type>::distance(*curr_entry,
v) )
{
best_entry = curr_entry;
}
++curr_entry;
}
return best_entry-mpPalette;
}
// -------------------------------------------------------
template< class Iterator >
value_type operator()(Iterator const& i) const
{
return mpPalette[ maAccessor(i) ];
}
template< class Iterator, class Difference >
value_type operator()(Iterator const& i, Difference const& diff) const
{
return mpPalette[ maAccessor(i,diff) ];
}
// -------------------------------------------------------
template< typename V, class Iterator >
void set(V const& value, Iterator const& i) const
{
maAccessor.set(
lookup(
vigra::detail::RequiresExplicitCast<value_type>::cast(value) ),
i );
}
template< typename V, class Iterator, class Difference >
void set(V const& value, Iterator const& i, Difference const& diff) const
{
maAccessor.set(
lookup(
vigra::detail::RequiresExplicitCast<value_type>::cast(value) ),
i,
diff );
}
};
} // namespace basebmp
#endif /* INCLUDED_BASEBMP_PALETTEIMAGEACCESSOR_HXX */
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