Add an API to change pointer acceleration profiles

The quartett of new config functions is:
	libinput_device_config_accel_get_profiles
	libinput_device_config_accel_get_profile
	libinput_device_config_accel_set_profile
	libinput_device_config_accel_get_default_profile

The profile defines how the pointer acceleration works, from a very high-level
perspective. Two profiles are on offer, "adaptive", the standard one we have
used so far and "flat" which is a simple multiplier of input deltas and
provides 1:1 mapping of device movement vs pointer movement.

The speed setting is on top of the profile, a speed of 0 (default) is the
equivalent to "no pointer acceleration". This is popular among gamers and
users of switchable-dpi mice.

The flat profile unnormalizes the deltas, i.e. you get what the device does
and any device below 800dpi will feel excruciatingly slow. The speed range
[-1, 1] maps into 0-200% of the speed. At 200%, a delta of 1 is translated
into a 2 pixel movement, anything higher makes it rather pointless.

The flat profile is currently available for all pointer devices but touchpads.

https://bugs.freedesktop.org/show_bug.cgi?id=89485

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/tools/libinput-list-devices.c b/tools/libinput-list-devices.c
index c156bf0..21685d9 100644
--- a/tools/libinput-list-devices.c
+++ b/tools/libinput-list-devices.c
@@ -172,6 +172,35 @@ click_defaults(struct libinput_device *device)
 	return str;
 }
 
+static char*
+accel_profiles(struct libinput_device *device)
+{
+	uint32_t profiles;
+	char *str;
+	enum libinput_config_accel_profile profile;
+
+	if (!libinput_device_config_accel_is_available(device)) {
+		xasprintf(&str, "n/a");
+		return str;
+	}
+
+	profiles = libinput_device_config_accel_get_profiles(device);
+	if (profiles == LIBINPUT_CONFIG_ACCEL_PROFILE_NONE) {
+		xasprintf(&str, "none");
+		return str;
+	}
+
+	profile = libinput_device_config_accel_get_default_profile(device);
+	xasprintf(&str,
+		  "%s%s%s%s",
+		  (profile == LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT) ? "*" : "",
+		  (profiles & LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT) ? "flat" : "",
+		  (profile == LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE) ? "*" : "",
+		  (profiles & LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE) ? "adaptive" : "");
+
+	return str;
+}
+
 static const char *
 dwt_default(struct libinput_device *device)
 {
@@ -249,6 +278,10 @@ print_device_notify(struct libinput_event *ev)
 
 	printf("Disable-w-typing: %s\n", dwt_default(dev));
 
+	str = accel_profiles(dev);
+	printf("Accel profiles:   %s\n", str);
+	free(str);
+
 	printf("\n");
 }