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diff --git a/source/blender/compositor/operations/COM_SMAAOperation.h b/source/blender/compositor/operations/COM_SMAAOperation.h
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+++ b/source/blender/compositor/operations/COM_SMAAOperation.h
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+/*
+ * Copyright 2017, Blender Foundation.
+ *
+ * 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.
+ *
+ * Contributor: IRIE Shinsuke
+ */
+
+#pragma once
+
+#include "COM_NodeOperation.h"
+
+namespace blender::compositor {
+
+/*-----------------------------------------------------------------------------*/
+/* Edge Detection (First Pass) */
+
+class SMAAEdgeDetectionOperation : public NodeOperation {
+ protected:
+  SocketReader *m_imageReader;
+  SocketReader *m_valueReader;
+
+  float m_threshold;
+  float m_contrast_limit;
+
+ public:
+  SMAAEdgeDetectionOperation();
+
+  /**
+   * the inner loop of this program
+   */
+  virtual void executePixel(float output[4], int x, int y, void *data) override;
+
+  /**
+   * Initialize the execution
+   */
+  void initExecution() override;
+
+  /**
+   * Deinitialize the execution
+   */
+  void deinitExecution() override;
+
+  void setThreshold(float threshold);
+
+  void setLocalContrastAdaptationFactor(float factor);
+
+  bool determineDependingAreaOfInterest(rcti *input,
+                                        ReadBufferOperation *readOperation,
+                                        rcti *output) override;
+};
+
+/*-----------------------------------------------------------------------------*/
+/*  Blending Weight Calculation (Second Pass) */
+
+class SMAABlendingWeightCalculationOperation : public NodeOperation {
+ private:
+  SocketReader *m_imageReader;
+
+  int m_corner_rounding;
+
+ public:
+  SMAABlendingWeightCalculationOperation();
+
+  /**
+   * the inner loop of this program
+   */
+  void executePixel(float output[4], int x, int y, void *data) override;
+
+  /**
+   * Initialize the execution
+   */
+  void initExecution() override;
+  void *initializeTileData(rcti *rect) override;
+
+  /**
+   * Deinitialize the execution
+   */
+  void deinitExecution() override;
+
+  void setCornerRounding(float rounding);
+
+  bool determineDependingAreaOfInterest(rcti *input,
+                                        ReadBufferOperation *readOperation,
+                                        rcti *output) override;
+
+ private:
+  /* Diagonal Search Functions */
+  int searchDiag1(int x, int y, int dir, bool *found);
+  int searchDiag2(int x, int y, int dir, bool *found);
+  void calculateDiagWeights(int x, int y, const float edges[2], float weights[2]);
+  bool isVerticalSearchUnneeded(int x, int y);
+
+  /* Horizontal/Vertical Search Functions */
+  int searchXLeft(int x, int y);
+  int searchXRight(int x, int y);
+  int searchYUp(int x, int y);
+  int searchYDown(int x, int y);
+
+  /*  Corner Detection Functions */
+  void detectHorizontalCornerPattern(float weights[2], int left, int right, int y, int d1, int d2);
+  void detectVerticalCornerPattern(float weights[2], int x, int top, int bottom, int d1, int d2);
+};
+
+/*-----------------------------------------------------------------------------*/
+/* Neighborhood Blending (Third Pass) */
+
+class SMAANeighborhoodBlendingOperation : public NodeOperation {
+ private:
+  SocketReader *m_image1Reader;
+  SocketReader *m_image2Reader;
+
+ public:
+  SMAANeighborhoodBlendingOperation();
+
+  /**
+   * the inner loop of this program
+   */
+  void executePixel(float output[4], int x, int y, void *data) override;
+
+  /**
+   * Initialize the execution
+   */
+  void initExecution() override;
+  void *initializeTileData(rcti *rect) override;
+
+  /**
+   * Deinitialize the execution
+   */
+  void deinitExecution() override;
+
+  bool determineDependingAreaOfInterest(rcti *input,
+                                        ReadBufferOperation *readOperation,
+                                        rcti *output) override;
+};
+
+}  // namespace blender::compositor