app: add new GimpToolWidget subclass GimpToolPolygon

which is the free select curve.

app/display/Makefile.am

@@ -172,6 +172,8 @@ libappdisplay_a_sources = \
 	gimptoolline.h				\
 	gimptoolpath.c				\
 	gimptoolpath.h				\
+	gimptoolpolygon.c			\
+	gimptoolpolygon.h			\
 	gimptoolrotategrid.c			\
 	gimptoolrotategrid.h			\
 	gimptoolsheargrid.c			\

app/display/gimptoolpolygon.h

@@ -0,0 +1,65 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimptoolpolygon.h
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_TOOL_POLYGON_H__
+#define __GIMP_TOOL_POLYGON_H__
+
+
+#include "gimptoolwidget.h"
+
+
+#define GIMP_TYPE_TOOL_POLYGON            (gimp_tool_polygon_get_type ())
+#define GIMP_TOOL_POLYGON(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_TOOL_POLYGON, GimpToolPolygon))
+#define GIMP_TOOL_POLYGON_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_TOOL_POLYGON, GimpToolPolygonClass))
+#define GIMP_IS_TOOL_POLYGON(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_TOOL_POLYGON))
+#define GIMP_IS_TOOL_POLYGON_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_TOOL_POLYGON))
+#define GIMP_TOOL_POLYGON_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_TOOL_POLYGON, GimpToolPolygonClass))
+
+
+typedef struct _GimpToolPolygon        GimpToolPolygon;
+typedef struct _GimpToolPolygonPrivate GimpToolPolygonPrivate;
+typedef struct _GimpToolPolygonClass   GimpToolPolygonClass;
+
+struct _GimpToolPolygon
+{
+  GimpToolWidget          parent_instance;
+
+  GimpToolPolygonPrivate *private;
+};
+
+struct _GimpToolPolygonClass
+{
+  GimpToolWidgetClass  parent_class;
+
+  void (* commit) (GimpToolPolygon *polygon);
+  void (* cancel) (GimpToolPolygon *polygon);
+};
+
+
+GType            gimp_tool_polygon_get_type   (void) G_GNUC_CONST;
+
+GimpToolWidget * gimp_tool_polygon_new        (GimpDisplayShell   *shell);
+
+void             gimp_tool_polygon_get_points (GimpToolPolygon    *polygon,
+                                               const GimpVector2 **points,
+                                               gint               *n_points);
+
+
+#endif /* __GIMP_TOOL_POLYGON_H__ */

po/POTFILES.in

@@ -257,6 +257,7 @@ app/display/gimpstatusbar.c
 app/display/gimptoolcompass.c
 app/display/gimptoolhandlegrid.c
 app/display/gimptoolpath.c
+app/display/gimptoolpolygon.c
 app/display/gimptooltransformgrid.c
 
 app/file/file-open.c