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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.
*
*=========================================================================*/
#ifndef elxLibUtilities_h
#define elxLibUtilities_h
#include "elxForEachSupportedImageType.h"
#include <itkCastImageFilter.h>
#include <itkDataObject.h>
#include <itkSmartPointer.h>
#include <map>
#include <string>
#include <type_traits> // For is_same_v.
#include <vector>
namespace elastix::LibUtilities
{
using ParameterValuesType = std::vector<std::string>;
using ParameterMapType = std::map<std::string, ParameterValuesType>;
/** Sets the specified parameter value. Warns when it overrides existing parameter values. */
void
SetParameterValueAndWarnOnOverride(ParameterMapType & parameterMap,
const std::string & parameterName,
const std::string & parameterValue);
/** Retrieves the PixelType string value of the specified parameter. Returns "float" by default. */
std::string
RetrievePixelTypeParameterValue(const ParameterMapType & parameterMap, const std::string & parameterName);
template <typename TInputImage>
itk::SmartPointer<itk::DataObject>
CastToInternalPixelType(itk::SmartPointer<TInputImage> inputImage, const std::string & internalPixelTypeString)
{
if (inputImage == nullptr)
{
itkGenericExceptionMacro("The specified input image should not be null!");
}
itk::SmartPointer<itk::DataObject> outputImage;
elx::ForEachSupportedImageTypeUntilTrue([inputImage, &outputImage, &internalPixelTypeString](const auto elxTypedef) {
using ElxTypedef = decltype(elxTypedef);
if constexpr (TInputImage::ImageDimension == ElxTypedef::MovingDimension)
{
using InternalImageType = typename ElxTypedef::MovingImageType;
if (internalPixelTypeString == ElxTypedef::MovingPixelTypeString)
{
if constexpr (std::is_same_v<TInputImage, InternalImageType>)
{
outputImage = inputImage;
}
else
{
const auto castFilter = itk::CastImageFilter<TInputImage, InternalImageType>::New();
castFilter->SetInput(inputImage);
castFilter->Update();
outputImage = castFilter->GetOutput();
}
return true;
}
}
return false;
});
if (outputImage == nullptr)
{
itkGenericExceptionMacro("Failed to cast to the specified internal pixel type \""
<< internalPixelTypeString
<< "\". It may need to be added to the CMake variable ELASTIX_IMAGE_"
<< TInputImage::ImageDimension << "D_PIXELTYPES.");
}
return outputImage;
}
} // namespace elastix::LibUtilities
#endif
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