/* SPDX-License-Identifier: GPL-2.0-or-later
 * 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