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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 ConstView.h
* @brief This file contains ConstView class
* @ingroup COM_AI_RUNTIME
*/
#ifndef __INTERNAL_NNAPI_TENSOR_CONST_VIEW_H__
#define __INTERNAL_NNAPI_TENSOR_CONST_VIEW_H__
#include "util/tensor/Shape.h"
#include "util/tensor/Index.h"
namespace internal
{
namespace nnapi
{
namespace tensor
{
/**
* @brief Wrapper class to read tensor values
* @tparam T The tensor element type
*/
template <typename T> class ConstView
{
public:
/**
* @brief Construct a ConstView class
* @param[in] shape Tensor shape
* @param[in] ptr The base pointer of actual data
* @param[in] len The number of bytes
*/
ConstView(const ::nnfw::misc::tensor::Shape &shape, const uint8_t *ptr, size_t len)
: _shape{shape}, _ptr{ptr}, _len{len}
{
// DO NOTHING
}
public:
const nnfw::misc::tensor::Shape &shape(void) const { return _shape; }
private:
// TODO Make this as a helper function, and share it for both View<T> and ConstView<T>
/**
* @brief Calculate offset for the given tensor index
* @param[in] index Tensor index
* @return The calculated offset
*/
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 the value on the given index
* @param[in] index Flattened tensor index
* @return The value on the given index
*/
T at(const nnfw::misc::tensor::Index &index) const
{
const auto offset = offset_of(index);
const T *arr = reinterpret_cast<const T *>(_ptr);
return arr[offset];
}
private:
const nnfw::misc::tensor::Shape _shape;
private:
const uint8_t *const _ptr;
const size_t _len;
};
} // namespace tensor
} // namespace nnapi
} // namespace internal
#endif // __INTERNAL_NNAPI_TENSOR_CONST_VIEW_H__
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