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diff --git a/app/display/gimpmotionbuffer.h b/app/display/gimpmotionbuffer.h
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpmotionbuffer.h
+ *
+ * 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_MOTION_BUFFER_H__
+#define __GIMP_MOTION_BUFFER_H__
+
+
+#include "core/gimpobject.h"
+
+
+#define GIMP_TYPE_MOTION_BUFFER (gimp_motion_buffer_get_type ())
+#define GIMP_MOTION_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_MOTION_BUFFER, GimpMotionBuffer))
+#define GIMP_MOTION_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_MOTION_BUFFER, GimpMotionBufferClass))
+#define GIMP_IS_MOTION_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_MOTION_BUFFER))
+#define GIMP_IS_MOTION_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_MOTION_BUFFER))
+#define GIMP_MOTION_BUFFER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_MOTION_BUFFER, GimpMotionBufferClass))
+
+
+typedef struct _GimpMotionBufferClass GimpMotionBufferClass;
+
+struct _GimpMotionBuffer
+{
+ GimpObject parent_instance;
+
+ guint32 last_read_motion_time;
+
+ guint32 last_motion_time; /* previous time of a forwarded motion event */
+ gdouble last_motion_delta_time;
+ gdouble last_motion_delta_x;
+ gdouble last_motion_delta_y;
+ gdouble last_motion_distance;
+
+ GimpCoords last_coords; /* last motion event */
+
+ GArray *event_history;
+ GArray *event_queue;
+ gboolean event_delay; /* TRUE if there's an unsent event in
+ * the history buffer
+ */
+
+ gint event_delay_timeout;
+ GdkModifierType last_active_state;
+};
+
+struct _GimpMotionBufferClass
+{
+ GimpObjectClass parent_class;
+
+ void (* stroke) (GimpMotionBuffer *buffer,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state);
+ void (* hover) (GimpMotionBuffer *buffer,
+ const GimpCoords *coords,
+ GdkModifierType state,
+ gboolean proximity);
+};
+
+
+GType gimp_motion_buffer_get_type (void) G_GNUC_CONST;
+
+GimpMotionBuffer * gimp_motion_buffer_new (void);
+
+void gimp_motion_buffer_begin_stroke (GimpMotionBuffer *buffer,
+ guint32 time,
+ GimpCoords *last_motion);
+void gimp_motion_buffer_end_stroke (GimpMotionBuffer *buffer);
+
+gboolean gimp_motion_buffer_motion_event (GimpMotionBuffer *buffer,
+ GimpCoords *coords,
+ guint32 time,
+ gboolean event_fill);
+guint32 gimp_motion_buffer_get_last_motion_time (GimpMotionBuffer *buffer);
+
+void gimp_motion_buffer_request_stroke (GimpMotionBuffer *buffer,
+ GdkModifierType state,
+ guint32 time);
+void gimp_motion_buffer_request_hover (GimpMotionBuffer *buffer,
+ GdkModifierType state,
+ gboolean proximity);
+
+
+#endif /* __GIMP_MOTION_BUFFER_H__ */