91 lines
3 KiB
C++
91 lines
3 KiB
C++
/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2008 by Sun Microsystems, Inc.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: intconversion.hxx,v $
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* $Revision: 1.2 $
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#ifndef INCLUDED_BASEBMP_INTCONVERSION_HXX
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#define INCLUDED_BASEBMP_INTCONVERSION_HXX
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#include <vigra/rgbvalue.hxx>
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#include <functional>
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namespace basebmp
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{
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// metafunctions to retrieve correct POD from/to basebmp::Color
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//------------------------------------------------------------------------
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/// type-safe conversion from RgbValue to packed int32
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template< class RgbVal > struct UInt32FromRgbValue
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{
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sal_uInt32 operator()( RgbVal const& c ) const
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{
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return (c[0] << 16) | (c[1] << 8) | c[2];
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}
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};
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/// type-safe conversion from packed int32 to RgbValue
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template< class RgbVal > struct RgbValueFromUInt32
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{
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RgbVal operator()( sal_uInt32 c ) const
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{
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return RgbVal((c >> 16) & 0xFF,
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(c >> 8) & 0xFF,
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c & 0xFF);
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}
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};
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/// Get converter from given data type to sal_uInt32
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template< typename DataType > struct uInt32Converter
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{
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typedef std::identity<DataType> to;
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typedef std::identity<DataType> from;
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};
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template< unsigned int RedIndex,
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unsigned int GreenIndex,
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unsigned int BlueIndex > struct uInt32Converter<
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vigra::RGBValue< sal_uInt8,
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RedIndex,
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GreenIndex,
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BlueIndex > >
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{
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typedef UInt32FromRgbValue<
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vigra::RGBValue< sal_uInt8,
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RedIndex,
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GreenIndex,
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BlueIndex > >
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to;
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typedef RgbValueFromUInt32<
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vigra::RGBValue< sal_uInt8,
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RedIndex,
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GreenIndex,
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BlueIndex > >
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from;
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};
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}
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#endif /* INCLUDED_BASEBMP_INTCONVERSION_HXX */
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