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/**************************************************************
*
* 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
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*************************************************************/
#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);
}
};
/// Get converter from given data type to sal_uInt32
template< typename DataType > struct uInt32Converter
{
typedef std::identity<DataType> to;
typedef std::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 */
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