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diff --git a/source/blender/compositor/operations/COM_PreviewOperation.h b/source/blender/compositor/operations/COM_PreviewOperation.h
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+++ b/source/blender/compositor/operations/COM_PreviewOperation.h
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+/*
+ * Copyright 2011, 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: 
+ *		Jeroen Bakker 
+ *		Monique Dewanchand
+ */
+
+#ifndef _COM_PreviewOperation_h
+#define _COM_PreviewOperation_h
+#include "COM_NodeOperation.h"
+#include "DNA_image_types.h"
+#include "BLI_rect.h"
+
+class PreviewOperation : public NodeOperation {
+protected:
+	unsigned char *outputBuffer;
+
+	/**
+	  * @brief holds reference to the SDNA bNode, where this nodes will render the preview image for
+	  */
+	bNode* node;
+	const bNodeTree* tree;
+	SocketReader* input;
+	float divider;
+	int priority;
+
+public:
+	PreviewOperation();
+	bool isOutputOperation(bool rendering) const {return true;}
+	void initExecution();
+	void deinitExecution();
+	const int getRenderPriority() const;
+	
+	void executeRegion(rcti *rect, unsigned int tileNumber, MemoryBuffer **memoryBuffers);
+	void determineResolution(unsigned int resolution[], unsigned int preferredResolution[]);
+	void setbNode(bNode* node) { this->node = node;}
+	void setbNodeTree(const bNodeTree* tree) { this->tree = tree;}
+	bool determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output);
+	void setPriority(int priority) { this->priority = priority; }
+};
+#endif