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diff --git a/source/blender/compositor/operations/COM_GaussianAlphaBlurBaseOperation.h b/source/blender/compositor/operations/COM_GaussianAlphaBlurBaseOperation.h
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+++ b/source/blender/compositor/operations/COM_GaussianAlphaBlurBaseOperation.h
@@ -0,0 +1,62 @@
+/*
+ * 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 2021, Blender Foundation.
+ */
+
+#pragma once
+
+#include "COM_BlurBaseOperation.h"
+
+namespace blender::compositor {
+
+class GaussianAlphaBlurBaseOperation : public BlurBaseOperation {
+ protected:
+  float *m_gausstab;
+  float *m_distbuf_inv;
+  int m_falloff; /* Falloff for #distbuf_inv. */
+  bool m_do_subtract;
+  int m_filtersize;
+  float rad_;
+  eDimension dimension_;
+
+ public:
+  GaussianAlphaBlurBaseOperation(eDimension dim);
+
+  virtual void init_data() override;
+  virtual void initExecution() override;
+  virtual void deinitExecution() override;
+
+  void get_area_of_interest(const int input_idx,
+                            const rcti &output_area,
+                            rcti &r_input_area) final;
+  void update_memory_buffer_partial(MemoryBuffer *output,
+                                    const rcti &area,
+                                    Span<MemoryBuffer *> inputs) final;
+
+  /**
+   * Set subtract for Dilate/Erode functionality
+   */
+  void setSubtract(bool subtract)
+  {
+    this->m_do_subtract = subtract;
+  }
+  void setFalloff(int falloff)
+  {
+    this->m_falloff = falloff;
+  }
+};
+
+}  // namespace blender::compositor