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Diffstat (limited to 'include/basebmp/pixelformatadapters.hxx')
| -rw-r--r-- | include/basebmp/pixelformatadapters.hxx | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/include/basebmp/pixelformatadapters.hxx b/include/basebmp/pixelformatadapters.hxx new file mode 100644 index 000000000000..09cc9368394d --- /dev/null +++ b/include/basebmp/pixelformatadapters.hxx @@ -0,0 +1,102 @@ +/* -*- 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_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 */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |