text: /*
   * Copyright (c) 2017-2019 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/CPP/kernels/CPPUpsampleKernel.h"
  
  #include "arm_compute/core/Error.h"
  #include "arm_compute/core/Helpers.h"
  #include "arm_compute/core/ITensor.h"
  #include "arm_compute/core/TensorInfo.h"
  #include "arm_compute/core/Types.h"
  #include "arm_compute/core/Validate.h"
  #include "arm_compute/core/utils/misc/ShapeCalculator.h"
  
  #include <cstddef>
  #include <cstdint>
  
  using namespace arm_compute;
  
  CPPUpsampleKernel::CPPUpsampleKernel()
      : _input(nullptr), _output(nullptr), _info(), _inner_border()
  {
  }
  
  bool CPPUpsampleKernel::is_parallelisable() const
  {
      return false;
  }
  
  void CPPUpsampleKernel::configure(const ITensor *input, ITensor *output, const PadStrideInfo &info, unsigned int inner_border_right, unsigned int inner_border_top)
  {
      ARM_COMPUTE_ERROR_ON_NULLPTR(input, output);
  
      _input        = input;
      _output       = output;
      _info         = info;
      _inner_border = std::make_pair(inner_border_right, inner_border_top);
  
      // Configure kernel window
      Window win = calculate_max_window(*input->info(), Steps());
  
      // The CPPUpsampleKernel doesn't need padding so update_window_and_padding() can be skipped
      Coordinates coord;
      coord.set_num_dimensions(output->info()->num_dimensions());
      output->info()->set_valid_region(ValidRegion(coord, output->info()->tensor_shape()));
  
      ICPPKernel::configure(win);
  }
  
  void CPPUpsampleKernel::run(const Window &window, const ThreadInfo &info)
  {
      ARM_COMPUTE_UNUSED(info);
      ARM_COMPUTE_ERROR_ON_UNCONFIGURED_KERNEL(this);
      ARM_COMPUTE_ERROR_ON_INVALID_SUBWINDOW(ICPPKernel::window(), window);
  
      // Initialize _scaled_output buffer
      const int    width_scaled  = _output->info()->dimension(0);
      const int    height_scaled = _output->info()->dimension(1);
      const int    stride_x      = _info.stride().first;
      const int    stride_y      = _info.stride().second;
      const int    start_x       = _info.pad().first;
      const int    start_y       = _inner_border.second + _info.pad().second;
      const int    end_y         = height_scaled - _info.pad().second;
      const int    end_x         = width_scaled - _inner_border.first - _info.pad().first;
      const size_t element_size  = _input->info()->element_size();
  
      std::fill_n(_output->buffer(), _output->info()->total_size(), 0);
  
      // Create window
      Window window_out(window);
      window_out.set(Window::DimX, Window::Dimension(start_x, end_x, stride_x));
      window_out.set(Window::DimY, Window::Dimension(start_y, end_y, stride_y));
  
      // Create iterators
      Iterator in(_input, window);
      Iterator out(_output, window_out);
  
      execute_window_loop(window, [&](const Coordinates &)
      {
          memcpy(out.ptr(), in.ptr(), element_size);
      },
      in, out);
  }
  