evdev: Improve touchpad support and add motion filters

Touchpad related code has been rewritten and moved to its own file
accessed by evdev via the dispatch interface.

The various functionality implemented are anti-jitter (don't jumping
around), smoother motions, touch detection, pointer acceleration and
some more.

Pointer acceleration is implemented as one generic part, and one touch
specific part (a profile).

Some ideas and magic numbers comes from xserver and
xf86-input-synaptics.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/src/filter.h b/src/filter.h
new file mode 100644
index 00000000..ff8e579f
--- /dev/null
+++ b/src/filter.h
@@ -0,0 +1,65 @@
+/*
+ * 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 <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_