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+/*
+ * Copyright (c) 2016-2020 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_NEDERIVATIVEKERNEL_H
+#define ARM_COMPUTE_NEDERIVATIVEKERNEL_H
+
+#include "src/core/NEON/INEKernel.h"
+
+namespace arm_compute
+{
+class ITensor;
+
+/** Interface for the kernel to run the derivative along the X/Y directions on a tensor.
+ *
+ */
+class NEDerivativeKernel : public INEKernel
+{
+public:
+ const char *name() const override
+ {
+ return "NEDerivativeKernel";
+ }
+ /** Default constructor */
+ NEDerivativeKernel();
+ /** Prevent instances of this class from being copied (As this class contains pointers) */
+ NEDerivativeKernel(const NEDerivativeKernel &) = delete;
+ /** Prevent instances of this class from being copied (As this class contains pointers) */
+ NEDerivativeKernel &operator=(const NEDerivativeKernel &) = delete;
+ /** Allow instances of this class to be moved */
+ NEDerivativeKernel(NEDerivativeKernel &&) = default;
+ /** Allow instances of this class to be moved */
+ NEDerivativeKernel &operator=(NEDerivativeKernel &&) = default;
+ /** Default destructor */
+ ~NEDerivativeKernel() = default;
+ /** Initialise the kernel's sources, destination and border
+ *
+ * @note At least one of output_x or output_y must be set
+ *
+ * @param[in] input Source tensor. Data type supported: U8.
+ * @param[out] output_x (Optional) Destination tensor for the X gradient. Data type supported: S16.
+ * @param[out] output_y (Optional) Destination tensor for the Y gradient. Data type supported: S16.
+ * @param[in] border_undefined True if the border mode is undefined. False if it's replicate or constant.
+ */
+ void configure(const ITensor *input, ITensor *output_x, ITensor *output_y, bool border_undefined);
+
+ // Inherited methods overridden:
+ void run(const Window &window, const ThreadInfo &info) override;
+ BorderSize border_size() const override;
+
+private:
+ /** Function to perform derivative along the X direction on the given window
+ *
+ * @param[in] window Region on which to execute the kernel
+ */
+ void derivative_x(const Window &window);
+ /** Function to perform derivative along the Y direction on the given window
+ *
+ * @param[in] window Region on which to execute the kernel
+ */
+ void derivative_y(const Window &window);
+ /** Function to perform derivative along the X and Y direction on the given window
+ *
+ * @param[in] window Region on which to execute the kernel
+ */
+ void derivative_xy(const Window &window);
+ /** Common signature for all the specialised derivative functions
+ *
+ * @param[in] window Region on which to execute the kernel.
+ */
+ using DerivativeFunction = void (NEDerivativeKernel::*)(const Window &window);
+ /** Derivative function to use for the particular tensor types passed to configure() */
+ DerivativeFunction _func;
+
+private:
+ const ITensor *_input; /**< Input tensor */
+ ITensor *_output_x; /**< Output tensor - Derivate along the X direction */
+ ITensor *_output_y; /**< Output tensor - Derivate along the Y direction */
+};
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_NEDERIVATIVEKERNEL_H */