/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Copyright 2011, Blender Foundation.
 */

#pragma once

#include "COM_CalculateMeanOperation.h"
#include "COM_NodeOperation.h"
#include "DNA_node_types.h"

namespace blender::compositor {

/**
 * \brief base class of CalculateStandardDeviation,
 * implementing the simple CalculateStandardDeviation.
 * \ingroup operation
 */
class CalculateStandardDeviationOperation : public CalculateMeanOperation {
 protected:
  float standard_deviation_;

 public:
  /**
   * The inner loop of this operation.
   */
  void execute_pixel(float output[4], int x, int y, void *data) override;

  void *initialize_tile_data(rcti *rect) override;

  void update_memory_buffer_started(MemoryBuffer *output,
                                    const rcti &area,
                                    Span<MemoryBuffer *> inputs) override;

  void update_memory_buffer_partial(MemoryBuffer *output,
                                    const rcti &area,
                                    Span<MemoryBuffer *> inputs) override;

 private:
  PixelsSum calc_area_sum(const MemoryBuffer *input, const rcti &area, float mean);
};

}  // namespace blender::compositor