1 files changed, 99 insertions, 0 deletions
diff --git a/app/display/gimpmotionbuffer.h b/app/display/gimpmotionbuffer.h
new file mode 100644
index 0000000..c7aee64
--- /dev/null
+++ b/app/display/gimpmotionbuffer.h
@@ -0,0 +1,99 @@
+/* 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__ */