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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_INTCONVERSION_HXX
#define INCLUDED_BASEBMP_INTCONVERSION_HXX
#include <vigra/rgbvalue.hxx>
#include <functional>
namespace basebmp
{
// metafunctions to retrieve correct POD from/to basebmp::Color
/// type-safe conversion from RgbValue to packed int32
template< class RgbVal > struct UInt32FromRgbValue
{
sal_uInt32 operator()( RgbVal const& c ) const
{
return (c[0] << 16) | (c[1] << 8) | c[2];
}
};
/// type-safe conversion from packed int32 to RgbValue
template< class RgbVal > struct RgbValueFromUInt32
{
RgbVal operator()( sal_uInt32 c ) const
{
return RgbVal((c >> 16) & 0xFF,
(c >> 8) & 0xFF,
c & 0xFF);
}
};
//Current c++0x draft (apparently) has std::identity, but not operator()
template<typename T> struct SGI_identity : public std::unary_function<T,T>
{
T& operator()(T& x) const { return x; }
const T& operator()(const T& x) const { return x; }
};
/// Get converter from given data type to sal_uInt32
template< typename DataType > struct uInt32Converter
{
typedef SGI_identity<DataType> to;
typedef SGI_identity<DataType> from;
};
template< unsigned int RedIndex,
unsigned int GreenIndex,
unsigned int BlueIndex > struct uInt32Converter<
vigra::RGBValue< sal_uInt8,
RedIndex,
GreenIndex,
BlueIndex > >
{
typedef UInt32FromRgbValue<
vigra::RGBValue< sal_uInt8,
RedIndex,
GreenIndex,
BlueIndex > >
to;
typedef RgbValueFromUInt32<
vigra::RGBValue< sal_uInt8,
RedIndex,
GreenIndex,
BlueIndex > >
from;
};
}
#endif /* INCLUDED_BASEBMP_INTCONVERSION_HXX */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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