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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 __INTERNAL_ARM_COMPUTE_FEATURE_VIEW_H__
+#define __INTERNAL_ARM_COMPUTE_FEATURE_VIEW_H__
+
+#include "util/feature/Reader.h"
+
+#include <arm_compute/core/ITensor.h>
+
+#include <cassert>
+
+namespace internal
+{
+namespace arm_compute
+{
+namespace feature
+{
+
+template <typename T> class View;
+
+template <> class View<float> final : public nnfw::util::feature::Reader<float>
+{
+public:
+ View(::arm_compute::ITensor *tensor) : _tensor{tensor}
+ {
+ assert(tensor->info()->data_type() == ::arm_compute::DataType::F32);
+
+ // TODO Validate whether tensor is a feature map, or not
+
+ _shape.C = tensor->info()->dimension(2);
+ _shape.H = tensor->info()->dimension(1);
+ _shape.W = tensor->info()->dimension(0);
+ }
+
+public:
+ const ::nnfw::util::feature::Shape &shape(void) const { return _shape; }
+
+public:
+ float at(uint32_t ch, uint32_t row, uint32_t col) const override
+ {
+ const auto offset = feature_index_to_byte_offset(ch, row, col);
+
+ float *ptr = reinterpret_cast<float *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+ float 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);
+
+ float *ptr = reinterpret_cast<float *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+
+public:
+ float &at(uint32_t ch, uint32_t row, uint32_t col)
+ {
+ const auto offset = feature_index_to_byte_offset(ch, row, col);
+
+ float *ptr = reinterpret_cast<float *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+ float &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);
+
+ float *ptr = reinterpret_cast<float *>(_tensor->buffer() + offset);
+
+ return *ptr;
+ }
+
+private:
+ 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});
+ }
+ 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:
+ ::nnfw::util::feature::Shape _shape;
+ ::arm_compute::ITensor *_tensor;
+};
+
+} // namespace feature
+} // namespace arm_compute
+} // namespace internal
+
+#endif // __INTERNAL_ARM_COMPUTE_FEATURE_VIEW_H__