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+/*
+ * Copyright © 2012 Jonas Ådahl
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _FILTER_H_
+#define _FILTER_H_
+
+#include "config.h"
+
+#include <wayland-util.h>
+
+#include "compositor.h"
+
+struct weston_motion_params {
+	double dx, dy;
+};
+
+struct weston_motion_filter;
+
+WL_EXPORT void
+weston_filter_dispatch(struct weston_motion_filter *filter,
+		       struct weston_motion_params *motion,
+		       void *data, uint32_t time);
+
+
+struct weston_motion_filter_interface {
+	void (*filter)(struct weston_motion_filter *filter,
+		       struct weston_motion_params *motion,
+		       void *data, uint32_t time);
+	void (*destroy)(struct weston_motion_filter *filter);
+};
+
+struct weston_motion_filter {
+	struct weston_motion_filter_interface *interface;
+	struct wl_list link;
+};
+
+WL_EXPORT struct weston_motion_filter *
+create_linear_acceleration_filter(double speed);
+
+typedef double (*accel_profile_func_t)(struct weston_motion_filter *filter,
+				       void *data,
+				       double velocity,
+				       uint32_t time);
+
+WL_EXPORT struct weston_motion_filter *
+create_pointer_accelator_filter(accel_profile_func_t filter);
+
+#endif // _FILTER_H_