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diff --git a/source/blender/compositor/intern/COM_MultiThreadedRowOperation.h b/source/blender/compositor/intern/COM_MultiThreadedRowOperation.h
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+++ b/source/blender/compositor/intern/COM_MultiThreadedRowOperation.h
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+/*
+ * 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_MultiThreadedOperation.h"
+
+namespace blender::compositor {
+
+/**
+ * Executes buffer updates per row. To be inherited only by operations with correlated coordinates
+ * between inputs and output.
+ */
+class MultiThreadedRowOperation : public MultiThreadedOperation {
+ protected:
+  struct PixelCursor {
+    float *out;
+    int out_stride;
+    const float *row_end;
+    Array<const float *> ins;
+    Array<int> in_strides;
+
+   public:
+    PixelCursor(int num_inputs);
+
+    void next()
+    {
+      BLI_assert(out < row_end);
+      out += out_stride;
+      for (int i = 0; i < ins.size(); i++) {
+        ins[i] += in_strides[i];
+      }
+    }
+  };
+
+ protected:
+  virtual void update_memory_buffer_row(PixelCursor &p) = 0;
+
+ private:
+  void update_memory_buffer_partial(MemoryBuffer *output,
+                                    const rcti &area,
+                                    Span<MemoryBuffer *> inputs) final;
+};
+
+}  // namespace blender::compositor