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diff --git a/cinelerra-5.1/plugins/motion/rotatescan.h b/cinelerra-5.1/plugins/motion/rotatescan.h
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+
+/*
+ * CINELERRA
+ * Copyright (C) 2016 Adam Williams <broadcast at earthling dot net>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+
+
+
+#ifndef ROTATESCAN_H
+#define ROTATESCAN_H
+
+
+
+#include "affine.inc"
+#include "loadbalance.h"
+#include "motion.inc"
+#include "vframe.inc"
+#include <stdint.h>
+
+class RotateScan;
+
+
+class RotateScanPackage : public LoadPackage
+{
+public:
+	RotateScanPackage();
+	float angle;
+	int64_t difference;
+};
+
+class RotateScanCache
+{
+public:
+	RotateScanCache(float angle, int64_t difference);
+	float angle;
+	int64_t difference;
+};
+
+class RotateScanUnit : public LoadClient
+{
+public:
+	RotateScanUnit(RotateScan *server, MotionMain *plugin);
+	~RotateScanUnit();
+
+	void process_package(LoadPackage *package);
+
+	RotateScan *server;
+	MotionMain *plugin;
+	AffineEngine *rotater;
+	VFrame *temp;
+};
+
+class RotateScan : public LoadServer
+{
+public:
+	RotateScan(MotionMain *plugin,
+		int total_clients,
+		int total_packages);
+	~RotateScan();
+
+	friend class RotateScanUnit;
+
+	void init_packages();
+	LoadClient* new_client();
+	LoadPackage* new_package();
+
+// Invoke the motion engine for a search
+// Frame before rotation
+	float scan_frame(VFrame *previous_frame,
+// Frame after rotation
+		VFrame *current_frame,
+// Pivot
+		int block_x,
+		int block_y);
+	int64_t get_cache(float angle);
+	void put_cache(float angle, int64_t difference);
+
+
+// Angle result
+	float result;
+
+private:
+	VFrame *previous_frame;
+// Frame after motion
+	VFrame *current_frame;
+
+	MotionMain *plugin;
+	int skip;
+
+// Pivot
+	int block_x;
+	int block_y;
+// Block to rotate
+	int block_x1;
+	int block_x2;
+	int block_y1;
+	int block_y2;
+// Area to compare
+	int scan_x;
+	int scan_y;
+	int scan_w;
+	int scan_h;
+// Range of angles to compare
+	float scan_angle1, scan_angle2;
+	int total_steps;
+
+	ArrayList<RotateScanCache*> cache;
+	Mutex *cache_lock;
+};
+
+
+
+
+
+#endif
+
+
+
+
+