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Diffstat (limited to 'include/basebmp/accessortraits.hxx')
-rw-r--r-- | include/basebmp/accessortraits.hxx | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/include/basebmp/accessortraits.hxx b/include/basebmp/accessortraits.hxx new file mode 100644 index 000000000000..4ce9e6926e35 --- /dev/null +++ b/include/basebmp/accessortraits.hxx @@ -0,0 +1,124 @@ +/* -*- 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_ACCESSORTRAITS_HXX +#define INCLUDED_BASEBMP_ACCESSORTRAITS_HXX + +#include <basebmp/accessorfunctors.hxx> +#include <basebmp/accessoradapters.hxx> +#include <basebmp/metafunctions.hxx> + +#include <functional> + +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; +}; + +//----------------------------------------------------------------------------- + +/** 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 project2nd< Accessor, value_type > 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_ACCESSORTRAITS_HXX */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |