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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.
+ */
+
+#ifndef __NEURUN_UTIL_FEATURE_NCHW_VIEW_H__
+#define __NEURUN_UTIL_FEATURE_NCHW_VIEW_H__
+
+#include "misc/feature/Reader.h"
+#include "misc/feature/Shape.h"
+
+#include "backend/interface/operand/ITensor.h"
+#include "util/feature/Coordinate4D.h"
+
+#include <cassert>
+
+namespace neurun
+{
+namespace util
+{
+namespace feature
+{
+namespace nchw
+{
+
+template <typename T> class View final : public nnfw::misc::feature::Reader<T>
+{
+public:
+ View(::neurun::backend::operand::ITensor *tensor) : _tensor{tensor}
+ {
+ // TODO Validate whether tensor is a feature map, or not
+ _shape.N = tensor->dimension(3);
+ _shape.C = tensor->dimension(2);
+ _shape.H = tensor->dimension(1);
+ _shape.W = tensor->dimension(0);
+ }
+
+public:
+ const ::nnfw::misc::feature::Shape &shape(void) const { return _shape; }
+
+public:
+ T at(uint32_t ch, uint32_t row, uint32_t col) const override
+ {
+ const auto offset = feature_index_to_byte_offset(0, ch, row, col);
+
+ T *ptr = reinterpret_cast<T *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+ 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:
+ T &at(uint32_t ch, uint32_t row, uint32_t col)
+ {
+ const auto offset = feature_index_to_byte_offset(0, ch, row, col);
+
+ T *ptr = reinterpret_cast<T *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+ 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:
+ size_t feature_index_to_byte_offset(uint32_t batch, uint32_t ch, uint32_t row, uint32_t col) const
+ {
+ return _tensor->calcOffset(
+ neurun::util::feature::Coordinate4D{static_cast<int32_t>(batch), static_cast<int32_t>(row),
+ static_cast<int32_t>(col), static_cast<int32_t>(ch)});
+ }
+
+private:
+ ::nnfw::misc::feature::Shape _shape;
+ ::neurun::backend::operand::ITensor *_tensor;
+};
+
+} // namespace nchw
+} // namespace feature
+} // namespace util
+} // namespace neurun
+
+#endif // __NEURUN_UTIL_FEATURE_NCHW_VIEW_H__