COM_DisplaceOperation.h

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/* SPDX-FileCopyrightText: 2011 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "COM_MultiThreadedOperation.h"
 
namespace blender::compositor {
 
class DisplaceOperation : public MultiThreadedOperation {
 private:
  float width_x4_;
  float height_x4_;
 
  int input_vector_width_;
  int input_vector_height_;
 
  std::function<void(float x, float y, float *out)> vector_read_fn_;
  std::function<void(float x, float y, float *out)> scale_x_read_fn_;
  std::function<void(float x, float y, float *out)> scale_y_read_fn_;
 
 public:
  DisplaceOperation();
 
  void pixel_transform(const float xy[2], float r_uv[2], float r_deriv[2][2]);
 
  void init_execution() override;
 
  void get_area_of_interest(int input_idx, const rcti &output_area, rcti &r_input_area) 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:
  bool read_displacement(
      float x, float y, float xscale, float yscale, const float origin[2], float &r_u, float &r_v);
};
 
}  // namespace blender::compositor