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diff --git a/app/core/gimpbrushpipe.h b/app/core/gimpbrushpipe.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ * Copyright (C) 1999 Adrian Likins and Tor Lillqvist
+ *
+ * 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_BRUSH_PIPE_H__
+#define __GIMP_BRUSH_PIPE_H__
+
+
+#include "gimpbrush.h"
+
+
+#define GIMP_TYPE_BRUSH_PIPE (gimp_brush_pipe_get_type ())
+#define GIMP_BRUSH_PIPE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_BRUSH_PIPE, GimpBrushPipe))
+#define GIMP_BRUSH_PIPE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_BRUSH_PIPE, GimpBrushPipeClass))
+#define GIMP_IS_BRUSH_PIPE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_BRUSH_PIPE))
+#define GIMP_IS_BRUSH_PIPE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_BRUSH_PIPE))
+#define GIMP_BRUSH_PIPE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_BRUSH_PIPE, GimpBrushPipeClass))
+
+
+typedef enum
+{
+ PIPE_SELECT_CONSTANT,
+ PIPE_SELECT_INCREMENTAL,
+ PIPE_SELECT_ANGULAR,
+ PIPE_SELECT_VELOCITY,
+ PIPE_SELECT_RANDOM,
+ PIPE_SELECT_PRESSURE,
+ PIPE_SELECT_TILT_X,
+ PIPE_SELECT_TILT_Y
+} PipeSelectModes;
+
+
+typedef struct _GimpBrushPipeClass GimpBrushPipeClass;
+
+struct _GimpBrushPipe
+{
+ GimpBrush parent_instance;
+
+ gint dimension;
+ gint *rank; /* Size in each dimension */
+ gint *stride; /* Aux for indexing */
+ PipeSelectModes *select; /* One mode per dimension */
+
+ gint *index; /* Current index for incremental dimensions */
+
+ gint n_brushes; /* Might be less than the product of the
+ * ranks in some odd special case */
+ GimpBrush **brushes;
+ GimpBrush *current; /* Currently selected brush */
+
+ gchar *params; /* For pipe <-> image conversion */
+};
+
+struct _GimpBrushPipeClass
+{
+ GimpBrushClass parent_class;
+};
+
+
+GType gimp_brush_pipe_get_type (void) G_GNUC_CONST;
+
+gboolean gimp_brush_pipe_set_params (GimpBrushPipe *pipe,
+ const gchar *paramstring);
+
+
+#endif /* __GIMP_BRUSH_PIPE_H__ */