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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.
*
*=========================================================================*/
#ifndef itkRingBuffer_hxx
#define itkRingBuffer_hxx
#include "itkMath.h"
#include "itkPrintHelper.h"
namespace itk
{
template <typename TElement>
RingBuffer<TElement>::RingBuffer()
: m_PointerVector()
{
// Default to 3 buffers
this->SetNumberOfBuffers(3);
}
template <typename TElement>
void
RingBuffer<TElement>::PrintSelf(std::ostream & os, Indent indent) const
{
using namespace print_helper;
Superclass::PrintSelf(os, indent);
os << indent << "PointerVector: " << m_PointerVector << std::endl;
}
template <typename TElement>
void
RingBuffer<TElement>::MoveHead(OffsetValueType offset)
{
// Compute the new Head index
this->m_HeadIndex = this->GetOffsetBufferIndex(offset);
// Mark as modified
this->Modified();
}
template <typename TElement>
void
RingBuffer<TElement>::MoveHeadForward()
{
this->MoveHead(1);
}
template <typename TElement>
void
RingBuffer<TElement>::MoveHeadBackward()
{
this->MoveHead(-1);
}
template <typename TElement>
bool
RingBuffer<TElement>::BufferIsFull(OffsetValueType offset)
{
auto bufferIndex = static_cast<size_t>(this->GetOffsetBufferIndex(offset));
return !(this->m_PointerVector[bufferIndex].IsNull());
}
template <typename TElement>
typename TElement::Pointer
RingBuffer<TElement>::GetBufferContents(OffsetValueType offset)
{
// Get the right buffer
auto bufferIndex = static_cast<size_t>(this->GetOffsetBufferIndex(offset));
// Return the resulting image
return this->m_PointerVector[bufferIndex];
}
template <typename TElement>
void
RingBuffer<TElement>::SetBufferContents(OffsetValueType offset, ElementPointer element)
{
// Get the right buffer
auto bufferIndex = static_cast<size_t>(this->GetOffsetBufferIndex(offset));
// Set the pointer
this->m_PointerVector[bufferIndex] = element;
// Mark as modified
this->Modified();
}
template <typename TElement>
auto
RingBuffer<TElement>::GetNumberOfBuffers() -> SizeValueType
{
return static_cast<typename RingBuffer<TElement>::SizeValueType>(this->m_PointerVector.size());
}
template <typename TElement>
void
RingBuffer<TElement>::SetNumberOfBuffers(SizeValueType n)
{
size_t currentSize = this->m_PointerVector.size();
// If larger than current size, insert difference after tail
if (n > currentSize)
{
for (size_t i = 0; i < n - currentSize; ++i)
{
ElementPointer newPointer = nullptr;
this->m_PointerVector.insert(this->m_PointerVector.begin() + this->m_HeadIndex, newPointer);
// Increment head index if this wasn't the first one added
if (this->m_PointerVector.size() > 1)
{
this->m_HeadIndex++;
}
}
}
// If smaller than current size, remove difference starting at tail
else if (n < currentSize)
{
for (size_t i = 0; i < currentSize - n; ++i)
{
const auto tailIndex = static_cast<SizeValueType>(this->GetOffsetBufferIndex(1));
this->m_PointerVector.erase(this->m_PointerVector.begin() + tailIndex);
// Decrement head index if necessary
if (this->m_HeadIndex > tailIndex)
{
this->m_HeadIndex--;
}
}
}
this->Modified();
}
template <typename TElement>
auto
RingBuffer<TElement>::GetOffsetBufferIndex(OffsetValueType offset) -> OffsetValueType
{
OffsetValueType moddedOffset = itk::Math::abs(offset) % this->GetNumberOfBuffers();
auto signedHeadIndex = static_cast<OffsetValueType>(m_HeadIndex);
if (offset >= 0)
{
return (signedHeadIndex + moddedOffset) % this->GetNumberOfBuffers();
}
else
{
return (signedHeadIndex + (this->GetNumberOfBuffers() - moddedOffset)) % this->GetNumberOfBuffers();
}
}
} // end namespace itk
#endif
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