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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* Licensed 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.txt
*
* 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.
*
*=========================================================================*/
//
// \author Denis P. Shamonin and Marius Staring. Division of Image Processing,
// Department of Radiology, Leiden, The Netherlands
//
// \note This work was funded by the Netherlands Organisation for
// Scientific Research (NWO NRG-2010.02 and NWO 639.021.124).
//
// OpenCL implementation of itk::Math
//------------------------------------------------------------------------------
//template< typename TReturn, typename TInput >
//inline TReturn RoundHalfIntegerToEven_base(TInput x)
//{
// if ( NumericTraits< TInput >::IsNonnegative(x) )
// {
// x += static_cast< TInput >( 0.5 );
// }
// else
// {
// x -= static_cast< TInput >( 0.5 );
// }
//
// const TReturn r = static_cast< TReturn >( x );
// return ( x != static_cast< TInput >( r ) ) ? r : static_cast< TReturn >( 2 *
// ( r / 2 ) );
//}
//------------------------------------------------------------------------------
// OpenCL implementation of
// itkMathDetail::RoundHalfIntegerToEven_32()
int round_half_integer_to_even_32( float x )
{
if ( x >= 0.0 )
{
x += 0.5f;
}
else
{
x -= 0.5f;
}
const int r = (int)( x );
return ( x != (float)( r ) ) ? r : (int)( 2 * ( r / 2 ) );
}
int round_half_integer_up_32( float x )
{
return round_half_integer_to_even_32( 2 * x + 0.5f ) >> 1;
}
//------------------------------------------------------------------------------
//template< typename TReturn, typename TInput >
//inline TReturn RoundHalfIntegerUp_base(TInput x)
//{
// x += static_cast< TInput >( 0.5 );
// const TReturn r = static_cast< TReturn >( x );
// return ( NumericTraits< TInput >::IsNonnegative(x) ) ?
//r :
// ( x == static_cast< TInput >( r ) ? r : r - static_cast< TReturn >( 1 ) );
//}
//------------------------------------------------------------------------------
// OpenCL implementation of
// itkMathDetail::RoundHalfIntegerUp_base()
//------------------------------------------------------------------------------
int round_half_integer_up( const float v )
{
float x = v + 0.5;
int r = (int)x;
return ( x >= 0.0 ) ?
r :
( x == (float)( r ) ? r : r - (int)( 1 ) );
}
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