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diff --git a/app/tools/gimpiscissorstool.h b/app/tools/gimpiscissorstool.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_ISCISSORS_TOOL_H__
+#define __GIMP_ISCISSORS_TOOL_H__
+
+
+#include "gimpselectiontool.h"
+
+
+/* The possible states... */
+typedef enum
+{
+ NO_ACTION,
+ SEED_PLACEMENT,
+ SEED_ADJUSTMENT,
+ WAITING
+} IscissorsState;
+
+/* For oper_update & cursor_update */
+typedef enum
+{
+ ISCISSORS_OP_NONE,
+ ISCISSORS_OP_SELECT,
+ ISCISSORS_OP_MOVE_POINT,
+ ISCISSORS_OP_ADD_POINT,
+ ISCISSORS_OP_REMOVE_POINT,
+ ISCISSORS_OP_CONNECT,
+ ISCISSORS_OP_IMPOSSIBLE
+} IscissorsOps;
+
+typedef struct _ISegment ISegment;
+typedef struct _ICurve ICurve;
+
+
+#define GIMP_TYPE_ISCISSORS_TOOL (gimp_iscissors_tool_get_type ())
+#define GIMP_ISCISSORS_TOOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_ISCISSORS_TOOL, GimpIscissorsTool))
+#define GIMP_ISCISSORS_TOOL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_ISCISSORS_TOOL, GimpIscissorsToolClass))
+#define GIMP_IS_ISCISSORS_TOOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_ISCISSORS_TOOL))
+#define GIMP_IS_ISCISSORS_TOOL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_ISCISSORS_TOOL))
+#define GIMP_ISCISSORS_TOOL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_ISCISSORS_TOOL, GimpIscissorsToolClass))
+
+#define GIMP_ISCISSORS_TOOL_GET_OPTIONS(t) (GIMP_ISCISSORS_OPTIONS (gimp_tool_get_options (GIMP_TOOL (t))))
+
+
+typedef struct _GimpIscissorsTool GimpIscissorsTool;
+typedef struct _GimpIscissorsToolClass GimpIscissorsToolClass;
+
+struct _GimpIscissorsTool
+{
+ GimpSelectionTool parent_instance;
+
+ IscissorsOps op;
+
+ gint x, y; /* mouse coordinates */
+
+ ISegment *segment1; /* 1st segment connected to current point */
+ ISegment *segment2; /* 2nd segment connected to current point */
+
+ ICurve *curve; /* the curve */
+
+ GList *undo_stack; /* stack of ICurves for undo */
+ GList *redo_stack; /* stack of ICurves for redo */
+
+ IscissorsState state; /* state of iscissors */
+
+ GeglBuffer *gradient_map; /* lazily filled gradient map */
+ GimpChannel *mask; /* selection mask */
+};
+
+struct _GimpIscissorsToolClass
+{
+ GimpSelectionToolClass parent_class;
+};
+
+
+void gimp_iscissors_tool_register (GimpToolRegisterCallback callback,
+ gpointer data);
+
+GType gimp_iscissors_tool_get_type (void) G_GNUC_CONST;
+
+
+#endif /* __GIMP_ISCISSORS_TOOL_H__ */