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diff --git a/source/blender/compositor/operations/COM_PosterizeOperation.h b/source/blender/compositor/operations/COM_PosterizeOperation.h
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+++ b/source/blender/compositor/operations/COM_PosterizeOperation.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 {
+
+class PosterizeOperation : public MultiThreadedOperation {
+ private:
+  /**
+   * Cached reference to the inputProgram
+   */
+  SocketReader *m_inputProgram;
+  SocketReader *m_inputStepsProgram;
+
+ public:
+  PosterizeOperation();
+
+  /**
+   * The inner loop of this operation.
+   */
+  void executePixelSampled(float output[4], float x, float y, PixelSampler sampler) override;
+
+  /**
+   * Initialize the execution
+   */
+  void initExecution() override;
+
+  /**
+   * Deinitialize the execution
+   */
+  void deinitExecution() override;
+
+  void update_memory_buffer_partial(MemoryBuffer *output,
+                                    const rcti &area,
+                                    Span<MemoryBuffer *> inputs) override;
+};
+
+}  // namespace blender::compositor