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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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.
*
*=========================================================================*/
/*=========================================================================
*
* Portions of this file are subject to the VTK Toolkit Version 3 copyright.
*
* Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
*
* For complete copyright, license and disclaimer of warranty information
* please refer to the NOTICE file at the top of the ITK source tree.
*
*=========================================================================*/
#ifndef itkImportImageContainer_hxx
#define itkImportImageContainer_hxx
#include <algorithm> // For copy_n.
namespace itk
{
template <typename TElementIdentifier, typename TElement>
ImportImageContainer<TElementIdentifier, TElement>::~ImportImageContainer()
{
DeallocateManagedMemory();
}
/**
* Tell the container to allocate enough memory to allow at least
* as many elements as the size given to be stored.
*/
template <typename TElementIdentifier, typename TElement>
void
ImportImageContainer<TElementIdentifier, TElement>::Reserve(ElementIdentifier size, const bool UseValueInitialization)
{
// Reserve has a Resize semantics. We keep it that way for
// backwards compatibility .
// See https://www.itk.org/Bug/view.php?id=2893 for details
if (m_ImportPointer)
{
if (size > m_Capacity)
{
TElement * temp = this->AllocateElements(size, UseValueInitialization);
// only copy the portion of the data used in the old buffer
std::copy_n(m_ImportPointer, m_Size, temp);
DeallocateManagedMemory();
m_ImportPointer = temp;
m_ContainerManageMemory = true;
m_Capacity = size;
m_Size = size;
this->Modified();
}
else
{
m_Size = size;
this->Modified();
}
}
else
{
m_ImportPointer = this->AllocateElements(size, UseValueInitialization);
m_Capacity = size;
m_Size = size;
m_ContainerManageMemory = true;
this->Modified();
}
}
/**
* Tell the container to try to minimize its memory usage for storage of
* the current number of elements.
*/
template <typename TElementIdentifier, typename TElement>
void
ImportImageContainer<TElementIdentifier, TElement>::Squeeze()
{
if (m_ImportPointer)
{
if (m_Size < m_Capacity)
{
const TElementIdentifier size = m_Size;
TElement * temp = this->AllocateElements(size, false);
std::copy_n(m_ImportPointer, m_Size, temp);
DeallocateManagedMemory();
m_ImportPointer = temp;
m_ContainerManageMemory = true;
m_Capacity = size;
m_Size = size;
this->Modified();
}
}
}
/**
* Tell the container to try to minimize its memory usage for storage of
* the current number of elements.
*/
template <typename TElementIdentifier, typename TElement>
void
ImportImageContainer<TElementIdentifier, TElement>::Initialize()
{
if (m_ImportPointer)
{
DeallocateManagedMemory();
m_ContainerManageMemory = true;
this->Modified();
}
}
/**
* Set the pointer from which the image data is imported. "num" is
* the number of pixels in the block of memory. If
* "LetContainerManageMemory" is false, then the application retains
* the responsibility of freeing the memory for this image data. If
* "LetContainerManageMemory" is true, then this class will free the
* memory when this object is destroyed.
*/
template <typename TElementIdentifier, typename TElement>
void
ImportImageContainer<TElementIdentifier, TElement>::SetImportPointer(TElement * ptr,
TElementIdentifier num,
bool LetContainerManageMemory)
{
DeallocateManagedMemory();
m_ImportPointer = ptr;
m_ContainerManageMemory = LetContainerManageMemory;
m_Capacity = num;
m_Size = num;
this->Modified();
}
template <typename TElementIdentifier, typename TElement>
TElement *
ImportImageContainer<TElementIdentifier, TElement>::AllocateElements(ElementIdentifier size,
bool UseValueInitialization) const
{
TElement * data;
try
{
if (UseValueInitialization)
{
data = new TElement[size]();
}
else
{
data = new TElement[size];
}
}
catch (...)
{
data = nullptr;
}
if (!data)
{
// We cannot construct an error string here because we may be out
// of memory. Do not use the exception macro.
throw MemoryAllocationError(__FILE__, __LINE__, "Failed to allocate memory for image.", ITK_LOCATION);
}
return data;
}
template <typename TElementIdentifier, typename TElement>
void
ImportImageContainer<TElementIdentifier, TElement>::DeallocateManagedMemory()
{
// Encapsulate all image memory deallocation here
if (m_ContainerManageMemory)
{
delete[] m_ImportPointer;
}
m_ImportPointer = nullptr;
m_Capacity = 0;
m_Size = 0;
}
template <typename TElementIdentifier, typename TElement>
void
ImportImageContainer<TElementIdentifier, TElement>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Pointer: " << static_cast<void *>(m_ImportPointer) << std::endl;
os << indent << "Container manages memory: " << (m_ContainerManageMemory ? "true" : "false") << std::endl;
os << indent << "Size: " << m_Size << std::endl;
os << indent << "Capacity: " << m_Capacity << std::endl;
}
} // end namespace itk
#endif
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