text: /*
   * Copyright (c) 2016-2019 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.
   */
  #include "arm_compute/core/CL/kernels/CLSobel5x5Kernel.h"
  
  #include "arm_compute/core/CL/CLKernelLibrary.h"
  #include "arm_compute/core/CL/ICLTensor.h"
  #include "arm_compute/core/CL/OpenCL.h"
  #include "arm_compute/core/Error.h"
  #include "arm_compute/core/Helpers.h"
  #include "arm_compute/core/Types.h"
  #include "arm_compute/core/Validate.h"
  #include "arm_compute/core/Window.h"
  
  #include <set>
  #include <string>
  
  using namespace arm_compute;
  
  CLSobel5x5HorKernel::CLSobel5x5HorKernel()
      : _input(nullptr), _output_x(nullptr), _output_y(nullptr), _run_sobel_x(false), _run_sobel_y(false), _border_size(0)
  {
  }
  
  BorderSize CLSobel5x5HorKernel::border_size() const
  {
      return _border_size;
  }
  
  void CLSobel5x5HorKernel::configure(const ICLTensor *input, ICLTensor *output_x, ICLTensor *output_y, bool border_undefined)
  {
      ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::U8);
      ARM_COMPUTE_ERROR_ON((output_x == nullptr) && (output_y == nullptr));
  
      _run_sobel_x = output_x != nullptr;
      _run_sobel_y = output_y != nullptr;
  
      if(_run_sobel_x)
      {
          ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output_x, 1, DataType::S16);
      }
  
      if(_run_sobel_y)
      {
          ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output_y, 1, DataType::S16);
      }
  
      _input       = input;
      _output_x    = output_x;
      _output_y    = output_y;
      _border_size = BorderSize(border_undefined ? 0 : 2, 2);
  
      // Set build options
      std::set<std::string> build_opts;
  
      if(_run_sobel_x)
      {
          build_opts.insert("-DGRAD_X");
      }
  
      if(_run_sobel_y)
      {
          build_opts.insert("-DGRAD_Y");
      }
  
      // Create kernel
      _kernel = static_cast<cl::Kernel>(CLKernelLibrary::get().create_kernel("sobel_separable1x5", build_opts));
  
      // Configure kernel window
      constexpr unsigned int num_elems_processed_per_iteration = 8;
      constexpr unsigned int num_elems_read_per_iteration      = 16;
      constexpr unsigned int num_elems_written_per_iteration   = 8;
  
      Window win = calculate_max_window_horizontal(*input->info(), Steps(num_elems_processed_per_iteration), border_undefined, border_size());
  
      AccessWindowHorizontal input_access(input->info(), -border_size().left, num_elems_read_per_iteration);
      AccessWindowHorizontal output_x_access(output_x == nullptr ? nullptr : output_x->info(), 0, num_elems_written_per_iteration);
      AccessWindowHorizontal output_y_access(output_y == nullptr ? nullptr : output_y->info(), 0, num_elems_written_per_iteration);
  
      update_window_and_padding(win, input_access, output_x_access, output_y_access);
  
      output_x_access.set_valid_region(win, input->info()->valid_region(), border_undefined, border_size());
      output_y_access.set_valid_region(win, input->info()->valid_region(), border_undefined, border_size());
  
      ICLKernel::configure_internal(win);
  }
  
  void CLSobel5x5HorKernel::run(const Window &window, cl::CommandQueue &queue)
  {
      ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
      ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(ICLKernel::window(), window);
  
      Window slice = window.first_slice_window_2D();
      do
      {
          unsigned int idx = 0;
          add_2D_tensor_argument(idx, _input, slice);
  
          if(_run_sobel_x)
          {
              add_2D_tensor_argument(idx, _output_x, slice);
          }
  
          if(_run_sobel_y)
          {
              add_2D_tensor_argument(idx, _output_y, slice);
          }
  
          enqueue(queue, *this, slice);
      }
      while(window.slide_window_slice_2D(slice));
  }
  
  CLSobel5x5VertKernel::CLSobel5x5VertKernel()
      : _input_x(nullptr), _input_y(nullptr), _output_x(nullptr), _output_y(nullptr), _run_sobel_x(false), _run_sobel_y(false)
  {
  }
  
  BorderSize CLSobel5x5VertKernel::border_size() const
  {
      return BorderSize{ 2, 0 };
  }
  
  void CLSobel5x5VertKernel::configure(const ICLTensor *input_x, const ICLTensor *input_y, ICLTensor *output_x, ICLTensor *output_y, bool border_undefined)
  {
      ARM_COMPUTE_ERROR_ON((output_x == nullptr) && (output_y == nullptr));
  
      _run_sobel_x = output_x != nullptr;
      _run_sobel_y = output_y != nullptr;
  
      if(_run_sobel_x)
      {
          ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input_x, 1, DataType::S16);
          ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output_x, 1, DataType::S16);
      }
  
      if(_run_sobel_y)
      {
          ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input_y, 1, DataType::S16);
          ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(output_y, 1, DataType::S16);
      }
  
      _input_x  = input_x;
      _input_y  = input_y;
      _output_x = output_x;
      _output_y = output_y;
  
      // Set build options
      std::set<std::string> build_opts;
  
      if(_run_sobel_x)
      {
          build_opts.insert("-DGRAD_X");
      }
  
      if(_run_sobel_y)
      {
          build_opts.insert("-DGRAD_Y");
      }
  
      // Create kernel
      _kernel = static_cast<cl::Kernel>(CLKernelLibrary::get().create_kernel("sobel_separable5x1", build_opts));
  
      const ICLTensor *input = _run_sobel_x ? _input_x : _input_y;
  
      // Configure kernel window
      constexpr unsigned int num_elems_processed_per_iteration = 8;
      constexpr unsigned int num_elems_written_per_iteration   = 8;
      constexpr unsigned int num_elems_read_per_iteration      = 8;
      constexpr unsigned int num_rows_read_per_iteration       = 5;
  
      Window win = calculate_max_window(*input->info(), Steps(num_elems_processed_per_iteration), border_undefined, border_size());
  
      AccessWindowRectangle  input_x_access(input_x == nullptr ? nullptr : input_x->info(), 0, -border_size().top, num_elems_read_per_iteration, num_rows_read_per_iteration);
      AccessWindowRectangle  input_y_access(input_y == nullptr ? nullptr : input_y->info(), 0, -border_size().top, num_elems_read_per_iteration, num_rows_read_per_iteration);
      AccessWindowHorizontal output_x_access(output_x == nullptr ? nullptr : output_x->info(), 0, num_elems_written_per_iteration);
      AccessWindowHorizontal output_y_access(output_y == nullptr ? nullptr : output_y->info(), 0, num_elems_written_per_iteration);
  
      update_window_and_padding(win, input_x_access, input_y_access, output_x_access, output_y_access);
  
      output_x_access.set_valid_region(win, input->info()->valid_region(), border_undefined, border_size());
      output_y_access.set_valid_region(win, input->info()->valid_region(), border_undefined, border_size());
  
      ICLKernel::configure_internal(win);
  }
  
  void CLSobel5x5VertKernel::run(const Window &window, cl::CommandQueue &queue)
  {
      ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
      ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(ICLKernel::window(), window);
  
      Window slice = window.first_slice_window_2D();
      do
      {
          unsigned int idx = 0;
  
          if(_run_sobel_x)
          {
              add_2D_tensor_argument(idx, _input_x, slice);
              add_2D_tensor_argument(idx, _output_x, slice);
          }
  
          if(_run_sobel_y)
          {
              add_2D_tensor_argument(idx, _input_y, slice);
              add_2D_tensor_argument(idx, _output_y, slice);
          }
  
          _kernel.setArg(idx++, 0 /*dummy*/);
  
          enqueue(queue, *this, slice);
      }
      while(window.slide_window_slice_2D(slice));
  }
  