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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::arm_compute::feature::View class
+ */
+#ifndef __INTERNAL_ARM_COMPUTE_FEATURE_VIEW_H__
+#define __INTERNAL_ARM_COMPUTE_FEATURE_VIEW_H__
+
+#include "misc/feature/Reader.h"
+
+#include <arm_compute/core/ITensor.h>
+
+namespace internal
+{
+namespace arm_compute
+{
+namespace feature
+{
+
+/**
+ * @brief Class to access feature's element
+ */
+template <typename T> class View final : public nnfw::misc::feature::Reader<T>
+{
+public:
+ /**
+ * @brief Construct a new View object
+ * @param[in] tensor Feature to support access
+ */
+ View(::arm_compute::ITensor *tensor) : _tensor{tensor}
+ {
+ // DO NOTHING
+ }
+
+public:
+ /**
+ * @brief Get value of element in 3D feature using channel, row and column
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Value of element
+ */
+ T at(uint32_t ch, uint32_t row, uint32_t col) const override
+ {
+ const auto offset = feature_index_to_byte_offset(ch, row, col);
+
+ T *ptr = reinterpret_cast<T *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+
+ /**
+ * @brief Get value of element in 4D feature using batch, channel, row and column
+ * @param[in] batch Batch index
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Value of element
+ */
+ T at(uint32_t batch, uint32_t ch, uint32_t row, uint32_t col) const override
+ {
+ const auto offset = feature_index_to_byte_offset(batch, ch, row, col);
+
+ T *ptr = reinterpret_cast<T *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+
+public:
+ /**
+ * @brief Get reference of element in 3D feature using channel, row and column
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Reference of element
+ */
+ T &at(uint32_t ch, uint32_t row, uint32_t col)
+ {
+ const auto offset = feature_index_to_byte_offset(ch, row, col);
+
+ T *ptr = reinterpret_cast<T *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+
+ /**
+ * @brief Get reference of element in 4D feature using batch, channel, row and column
+ * @param[in] batch Batch index
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Reference of element
+ */
+ T &at(uint32_t batch, uint32_t ch, uint32_t row, uint32_t col)
+ {
+ const auto offset = feature_index_to_byte_offset(batch, ch, row, col);
+
+ T *ptr = reinterpret_cast<T *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+
+private:
+ /**
+ * @brief Get offset of element in 3D feature
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Offset of element
+ */
+ size_t feature_index_to_byte_offset(uint32_t ch, uint32_t row, uint32_t col) const
+ {
+ // ARM Compute uses CHW ordering
+ return _tensor->info()->offset_element_in_bytes(::arm_compute::Coordinates{col, row, ch});
+ }
+
+ /**
+ * @brief Get offset of element in 4D feature
+ * @param[in] batch Batch index
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Offset of element
+ */
+ size_t feature_index_to_byte_offset(uint32_t batch, uint32_t ch, uint32_t row, uint32_t col) const
+ {
+ // ARM Compute uses CHW ordering
+ return _tensor->info()->offset_element_in_bytes(
+ ::arm_compute::Coordinates{col, row, ch, batch});
+ }
+
+private:
+ ::arm_compute::ITensor *_tensor;
+};
+
+} // namespace feature
+} // namespace arm_compute
+} // namespace internal
+
+#endif // __INTERNAL_ARM_COMPUTE_FEATURE_VIEW_H__