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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_INC_ACCESSORTRAITS_HXX
#define INCLUDED_BASEBMP_INC_ACCESSORTRAITS_HXX
#include <accessorfunctors.hxx>
#include <accessoradapters.hxx>
#include <metafunctions.hxx>
namespace basebmp
{
struct FastMask;
struct NoFastMask;
/// Metafunction to select output mask functor from iterator and mask value type
template< typename T, typename M, bool polarity, typename DUMMY > struct outputMaskFunctorSelector : public
ifBothScalarIntegral< T, M,
IntegerOutputMaskFunctor< T, M, polarity >,
GenericOutputMaskFunctor< T, M, polarity > >
{
};
template< typename T, typename M, bool polarity > struct outputMaskFunctorSelector< T, M, polarity, FastMask > : public
ifBothScalarIntegral< T, M,
FastIntegerOutputMaskFunctor< T, M, polarity >,
GenericOutputMaskFunctor< T, M, polarity > >
{
};
/** Metafunction providing a point of configuration for iterators
capable of employing the fast output mask functor.
Specialize this metafunction for your case, and pass FastMask to
the outputMaskFunctorSelector.
*/
template< class Accessor,
class MaskAccessor,
class Iterator,
class MaskIterator,
bool polarity > struct maskedAccessorSelector
{
typedef TernarySetterFunctionAccessorAdapter<
Accessor,
MaskAccessor,
typename outputMaskFunctorSelector<
typename Accessor::value_type,
typename MaskAccessor::value_type,
polarity,
NoFastMask > ::type >
type;
};
/// given an Accessor and its value type return its value_type
template< typename Accessor > struct ColorPassThrough
{
typename Accessor::value_type operator()( const Accessor&,
const typename Accessor::value_type& x ) const
{
return x;
}
};
/** Traits template for Accessor
Provides wrapped types for color lookup, raw pixel access, xor and
mask accessors.
*/
template< class Accessor > struct AccessorTraits
{
/// value type of described accessor
typedef typename Accessor::value_type value_type;
/// Retrieve stand-alone color lookup function for given Accessor type
typedef ColorPassThrough< Accessor > color_lookup;
/// Retrieve raw pixel data accessor for given Accessor type
typedef Accessor raw_accessor;
/// Retrieve wrapped accessor for XOR setter access
typedef BinarySetterFunctionAccessorAdapter<
Accessor,
XorFunctor< value_type > > xor_accessor;
/** Retrieve masked accessor for given types
A masked accessor works like a filter, where the mask gates
the accessor's setter methods (if the mask contains a 0 at a
given iterator position, the original value is
preserved. Otherwise, the new value gets set).
@attention be careful when retrieving a masked accessor for a
set of types, and using it for a different one - there are
partial specializations that take an optimized functor for
certain mask accessors.
*/
template< class MaskAccessor,
class Iterator,
class MaskIterator,
bool polarity > struct masked_accessor :
public maskedAccessorSelector< Accessor,
MaskAccessor,
Iterator,
MaskIterator,
polarity >
{};
};
} // namespace basebmp
#endif /* INCLUDED_BASEBMP_INC_ACCESSORTRAITS_HXX */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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