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/*
* Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
*
* 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
*
* 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.
*/
/**
* @file View.h
* @ingroup COM_AI_RUNTIME
* @brief This file defines internal::nnapi::tensor::View class
*/
#ifndef __INTERNAL_NNAPI_TENSOR_VIEW_H__
#define __INTERNAL_NNAPI_TENSOR_VIEW_H__
#include "misc/tensor/Shape.h"
#include "misc/tensor/Index.h"
namespace internal
{
namespace nnapi
{
namespace tensor
{
/**
* @brief Class to access tensor's element information using index
*/
template <typename T> class View
{
public:
/**
* @brief Construct a new View object
* @param[in] shape Shape of tensor
* @param[in] ptr Pointer to tensor data
* @param[in] len Size of tensor (byte)
*/
// NOTE The parameter len denotes the number of bytes.
View(const ::nnfw::misc::tensor::Shape &shape, T *ptr, size_t len) : _shape{shape}, _ptr{ptr}
{
assert(shape.num_elements() * sizeof(T) == len);
}
public:
/**
* @brief Get shape of tensor
* @return Shape of tensor
*/
const nnfw::misc::tensor::Shape &shape(void) const { return _shape; }
private:
/**
* @brief Get position of element using index in tensor
* @param[in] index Index of element
* @return Position of element
*/
uint32_t offset_of(const nnfw::misc::tensor::Index &index) const
{
if (_shape.rank() == 0)
{
return 0;
}
uint32_t offset = index.at(0);
// Stride decreases as axis increases in NNAPI
for (uint32_t axis = 1; axis < _shape.rank(); ++axis)
{
offset *= _shape.dim(axis);
offset += index.at(axis);
}
return offset;
}
public:
/**
* @brief Get value of element at index
* @param[in] index Index of element
* @return Value of element at index
*/
T at(const nnfw::misc::tensor::Index &index) const
{
const auto offset = offset_of(index);
return _ptr[offset];
}
/**
* @brief Get reference of element at index
* @param[in] index Index of element
* @return Reference of element at index
*/
T &at(const nnfw::misc::tensor::Index &index)
{
const auto offset = offset_of(index);
return _ptr[offset];
}
private:
nnfw::misc::tensor::Shape _shape;
private:
T *_ptr;
};
} // namespace tensor
} // namespace nnapi
} // namespace internal
#endif // __INTERNAL_NNAPI_TENSOR_VIEW_H__
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