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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 FeatureView.h
+ * @brief This file contains FeatureView class
+ * @ingroup COM_AI_RUNTIME
+ */
+
+#ifndef __NNFW_TFLITE_FEATURE_VIEW_H__
+#define __NNFW_TFLITE_FEATURE_VIEW_H__
+
+#include "tensorflow/lite/interpreter.h"
+
+#include "tflite/InputIndex.h"
+#include "tflite/OutputIndex.h"
+
+#include "misc/feature/Shape.h"
+#include "misc/feature/Reader.h"
+
+namespace nnfw
+{
+namespace tflite
+{
+
+template <typename T> class FeatureView;
+
+/**
+ * @brief Class to support reading element of float type feature
+ */
+template <> class FeatureView<float> : public nnfw::misc::feature::Reader<float>
+{
+public:
+ /**
+ * @brief Construct a new FeatureView object
+ * @param[in] interp Interpreter to read from
+ * @param[in] index InputIndex index of input
+ */
+ FeatureView(::tflite::Interpreter &interp, const InputIndex &index);
+ /**
+ * @brief Construct a new FeatureView object
+ * @param[in] interp Interpreter to read from
+ * @param[in] index OutputIndex index of output
+ */
+ FeatureView(::tflite::Interpreter &interp, const OutputIndex &index);
+
+public:
+ /**
+ * @brief Get value of element using channel, row and column index
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Value of element
+ */
+ float at(uint32_t ch, uint32_t row, uint32_t col) const;
+ /**
+ * @brief Get reference of element using channel, row and column index
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Reference of element
+ */
+ float &at(uint32_t ch, uint32_t row, uint32_t col);
+
+ float at(uint32_t batch, uint32_t ch, uint32_t row, uint32_t col) const = 0;
+
+private:
+ /**
+ * @brief Get offset of element from channel, row and column index
+ * @param[in] ch Channel index
+ * @param[in] row Row index
+ * @param[in] col Column index
+ * @return Offset of element
+ */
+ uint32_t getElementOffset(uint32_t ch, uint32_t row, uint32_t col) const
+ {
+ uint32_t res = 0;
+
+ // TensorFlow Lite assumes that NHWC ordering for tessor
+ res += row * _shape.W * _shape.C;
+ res += col * _shape.C;
+ res += ch;
+
+ return res;
+ }
+
+private:
+ nnfw::misc::feature::Shape _shape;
+ float *_base;
+};
+
+} // namespace tflite
+} // namespace nnfw
+
+#endif // __NNFW_TFLITE_FEATURE_VIEW_H__