--- /dev/null
+/*
+ * Copyright © 2006-2009 Simon Thum
+ * Copyright © 2012 Jonas Ådahl
+ * Copyright © 2014-2015 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include <math.h>
+
+#include "filter.h"
+#include "libinput-util.h"
+#include "filter-private.h"
+
+/* Trackpoint acceleration */
+#define TRACKPOINT_DEFAULT_MAX_ACCEL 2.0 /* in units/us */
+#define TRACKPOINT_DEFAULT_MAX_DELTA 60
+/* As measured on a Lenovo T440 at kernel-default sensitivity 128 */
+#define TRACKPOINT_DEFAULT_RANGE 20 /* max value */
+
+struct tablet_accelerator_flat {
+ struct motion_filter base;
+
+ double factor;
+ int xres, yres;
+ double xres_scale, /* 1000dpi : tablet res */
+ yres_scale; /* 1000dpi : tablet res */
+};
+
+struct trackpoint_accelerator {
+ struct motion_filter base;
+
+ struct device_float_coords history[4];
+ size_t history_size;
+
+ double scale_factor;
+ double max_accel;
+ double max_delta;
+
+ double incline; /* incline of the function */
+ double offset; /* offset of the function */
+};
+
+double
+trackpoint_accel_profile(struct motion_filter *filter,
+ void *data,
+ double delta)
+{
+ struct trackpoint_accelerator *accel_filter =
+ (struct trackpoint_accelerator *)filter;
+ const double max_accel = accel_filter->max_accel;
+ double factor;
+
+ delta = fabs(delta);
+
+ /* This is almost the equivalent of the xserver acceleration
+ at sensitivity 128 and speed 0.0 */
+ factor = delta * accel_filter->incline + accel_filter->offset;
+ factor = min(factor, max_accel);
+
+ return factor;
+}
+
+/**
+ * Average the deltas, they are messy and can provide sequences like 7, 7,
+ * 9, 8, 14, 7, 9, 8 ... The outliers cause unpredictable jumps, so average
+ * them out.
+ */
+static inline struct device_float_coords
+trackpoint_average_delta(struct trackpoint_accelerator *filter,
+ const struct device_float_coords *unaccelerated)
+{
+ size_t i;
+ struct device_float_coords avg = {0};
+
+ memmove(&filter->history[1],
+ &filter->history[0],
+ sizeof(*filter->history) * (filter->history_size - 1));
+ filter->history[0] = *unaccelerated;
+
+ for (i = 0; i < filter->history_size; i++) {
+ avg.x += filter->history[i].x;
+ avg.y += filter->history[i].y;
+ }
+ avg.x /= filter->history_size;
+ avg.y /= filter->history_size;
+
+ return avg;
+}
+
+/**
+ * Undo any system-wide magic scaling, so we're behaving the same regardless
+ * of the trackpoint hardware. This way we can apply our profile independent
+ * of any other configuration that messes with things.
+ */
+static inline struct device_float_coords
+trackpoint_normalize_deltas(const struct trackpoint_accelerator *accel_filter,
+ const struct device_float_coords *delta)
+{
+ struct device_float_coords scaled = *delta;
+
+ scaled.x *= accel_filter->scale_factor;
+ scaled.y *= accel_filter->scale_factor;
+
+ return scaled;
+}
+
+/**
+ * We set a max delta per event, to avoid extreme jumps once we exceed the
+ * expected pressure. Trackpoint hardware is inconsistent once the pressure
+ * gets high, so we can expect sequences like 30, 40, 35, 55, etc. This may
+ * be caused by difficulty keeping up high consistent pressures or just
+ * measuring errors in the hardware. Either way, we cap to a max delta so
+ * once we hit the high pressures, movement is capped and consistent.
+ */
+static inline struct normalized_coords
+trackpoint_clip_to_max_delta(const struct trackpoint_accelerator *accel_filter,
+ struct normalized_coords coords)
+{
+ const double max_delta = accel_filter->max_delta;
+
+ if (abs(coords.x) > max_delta)
+ coords.x = copysign(max_delta, coords.x);
+ if (abs(coords.y) > max_delta)
+ coords.y = copysign(max_delta, coords.y);
+
+ return coords;
+}
+
+static struct normalized_coords
+trackpoint_accelerator_filter(struct motion_filter *filter,
+ const struct device_float_coords *unaccelerated,
+ void *data, uint64_t time)
+{
+ struct trackpoint_accelerator *accel_filter =
+ (struct trackpoint_accelerator *)filter;
+ struct device_float_coords scaled;
+ struct device_float_coords avg;
+ struct normalized_coords coords;
+ double f;
+ double delta;
+
+ scaled = trackpoint_normalize_deltas(accel_filter, unaccelerated);
+ avg = trackpoint_average_delta(accel_filter, &scaled);
+
+ delta = hypot(avg.x, avg.y);
+
+ f = trackpoint_accel_profile(filter, data, delta);
+
+ coords.x = avg.x * f;
+ coords.y = avg.y * f;
+
+ coords = trackpoint_clip_to_max_delta(accel_filter, coords);
+
+ return coords;
+}
+
+static struct normalized_coords
+trackpoint_accelerator_filter_noop(struct motion_filter *filter,
+ const struct device_float_coords *unaccelerated,
+ void *data, uint64_t time)
+{
+
+ struct trackpoint_accelerator *accel_filter =
+ (struct trackpoint_accelerator *)filter;
+ struct device_float_coords scaled;
+ struct device_float_coords avg;
+ struct normalized_coords coords;
+
+ scaled = trackpoint_normalize_deltas(accel_filter, unaccelerated);
+ avg = trackpoint_average_delta(accel_filter, &scaled);
+
+ coords.x = avg.x;
+ coords.y = avg.y;
+
+ coords = trackpoint_clip_to_max_delta(accel_filter, coords);
+
+ return coords;
+}
+
+static bool
+trackpoint_accelerator_set_speed(struct motion_filter *filter,
+ double speed_adjustment)
+{
+ struct trackpoint_accelerator *accel_filter =
+ (struct trackpoint_accelerator*)filter;
+ double incline, offset, max;
+
+ assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
+
+ /* Helloooo, magic numbers.
+
+ These numbers were obtained by finding an acceleration curve that
+ provides precision at slow speeds but still provides a good
+ acceleration at higher pressure - and a quick ramp-up to that
+ acceleration.
+
+ Trackpoints have built-in acceleration curves already, so we
+ don't put a new function on top, we merely scale the output from
+ those curves (re-calculating the pressure values from the
+ firmware-defined curve and applying a new curve is unreliable).
+
+ For that basic scaling, we assume a constant factor f based on
+ the speed setting together with a maximum factor m (for this
+ speed setting). Delta acceleration is thus:
+ factor = max(m, f)
+ accelerated_delta = delta * factor;
+
+ Trial and error showed a couple of pairs that work well for the
+ various speed settings (Lenovo T440, sensitivity 128):
+
+ -1.0: f = 0.3, m = 1
+ -0.5: f = 0.6, m = 2
+ 0.0: f = 1.0, m = 6
+ 0.5: f = 1.4, m = 8
+ 1.0: f = 1.9, m = 15
+
+ Note: if f >= 2.0, some pixels are unaddressable
+
+ Those pairs were fed into the linear/exponential regression tool
+ at http://www.xuru.org/rt/LR.asp and show two functions that map
+ speed settings to the respective f and m.
+ Given a speed setting s in [-1.0, 1.0]
+ f(s) = 0.8 * s + 1.04
+ m(s) = 4.6 * e**(1.2 * s)
+ These are close enough to the tested pairs.
+ */
+
+ max = 4.6 * pow(M_E, 1.2 * speed_adjustment);
+ incline = 0.8 * speed_adjustment + 1.04;
+ offset = 0;
+
+ accel_filter->max_accel = max;
+ accel_filter->incline = incline;
+ accel_filter->offset = offset;
+ filter->speed_adjustment = speed_adjustment;
+
+ return true;
+}
+
+static void
+trackpoint_accelerator_destroy(struct motion_filter *filter)
+{
+ struct trackpoint_accelerator *accel_filter =
+ (struct trackpoint_accelerator *)filter;
+
+ free(accel_filter);
+}
+
+struct motion_filter_interface accelerator_interface_trackpoint = {
+ .type = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE,
+ .filter = trackpoint_accelerator_filter,
+ .filter_constant = trackpoint_accelerator_filter_noop,
+ .restart = NULL,
+ .destroy = trackpoint_accelerator_destroy,
+ .set_speed = trackpoint_accelerator_set_speed,
+};
+
+struct motion_filter *
+create_pointer_accelerator_filter_trackpoint(int max_hw_delta)
+{
+ struct trackpoint_accelerator *filter;
+
+ /* Trackpoints are special. They don't have a movement speed like a
+ * mouse or a finger, instead they send a constant stream of events
+ * based on the pressure applied.
+ *
+ * Physical ranges on a trackpoint are the max values for relative
+ * deltas, but these are highly device-specific.
+ *
+ */
+
+ filter = zalloc(sizeof *filter);
+ if (!filter)
+ return NULL;
+
+ filter->history_size = ARRAY_LENGTH(filter->history);
+ filter->scale_factor = 1.0 * TRACKPOINT_DEFAULT_RANGE / max_hw_delta;
+ filter->max_accel = TRACKPOINT_DEFAULT_MAX_ACCEL;
+ filter->max_delta = TRACKPOINT_DEFAULT_MAX_DELTA;
+
+ filter->base.interface = &accelerator_interface_trackpoint;
+
+ return &filter->base;
+}
#define TOUCHPAD_ACCELERATION 9.0 /* unitless factor */
#define TOUCHPAD_INCLINE 0.011 /* unitless factor */
-/* Trackpoint acceleration */
-#define TRACKPOINT_DEFAULT_MAX_ACCEL 2.0 /* in units/us */
-#define TRACKPOINT_DEFAULT_MAX_DELTA 60
-/* As measured on a Lenovo T440 at kernel-default sensitivity 128 */
-#define TRACKPOINT_DEFAULT_RANGE 20 /* max value */
-
/*
* Pointer acceleration filter constants
*/
int dpi;
};
-struct trackpoint_accelerator {
- struct motion_filter base;
-
- struct device_float_coords history[4];
- size_t history_size;
-
- double scale_factor;
- double max_accel;
- double max_delta;
-
- double incline; /* incline of the function */
- double offset; /* offset of the function */
-};
-
void
init_trackers(struct pointer_trackers *trackers,
size_t ntrackers)
return &filter->base;
}
-double
-trackpoint_accel_profile(struct motion_filter *filter,
- void *data,
- double delta)
-{
- struct trackpoint_accelerator *accel_filter =
- (struct trackpoint_accelerator *)filter;
- const double max_accel = accel_filter->max_accel;
- double factor;
-
- delta = fabs(delta);
-
- /* This is almost the equivalent of the xserver acceleration
- at sensitivity 128 and speed 0.0 */
- factor = delta * accel_filter->incline + accel_filter->offset;
- factor = min(factor, max_accel);
-
- return factor;
-}
-
-/**
- * Average the deltas, they are messy and can provide sequences like 7, 7,
- * 9, 8, 14, 7, 9, 8 ... The outliers cause unpredictable jumps, so average
- * them out.
- */
-static inline struct device_float_coords
-trackpoint_average_delta(struct trackpoint_accelerator *filter,
- const struct device_float_coords *unaccelerated)
-{
- size_t i;
- struct device_float_coords avg = {0};
-
- memmove(&filter->history[1],
- &filter->history[0],
- sizeof(*filter->history) * (filter->history_size - 1));
- filter->history[0] = *unaccelerated;
-
- for (i = 0; i < filter->history_size; i++) {
- avg.x += filter->history[i].x;
- avg.y += filter->history[i].y;
- }
- avg.x /= filter->history_size;
- avg.y /= filter->history_size;
-
- return avg;
-}
-
-/**
- * Undo any system-wide magic scaling, so we're behaving the same regardless
- * of the trackpoint hardware. This way we can apply our profile independent
- * of any other configuration that messes with things.
- */
-static inline struct device_float_coords
-trackpoint_normalize_deltas(const struct trackpoint_accelerator *accel_filter,
- const struct device_float_coords *delta)
-{
- struct device_float_coords scaled = *delta;
-
- scaled.x *= accel_filter->scale_factor;
- scaled.y *= accel_filter->scale_factor;
-
- return scaled;
-}
-
-/**
- * We set a max delta per event, to avoid extreme jumps once we exceed the
- * expected pressure. Trackpoint hardware is inconsistent once the pressure
- * gets high, so we can expect sequences like 30, 40, 35, 55, etc. This may
- * be caused by difficulty keeping up high consistent pressures or just
- * measuring errors in the hardware. Either way, we cap to a max delta so
- * once we hit the high pressures, movement is capped and consistent.
- */
-static inline struct normalized_coords
-trackpoint_clip_to_max_delta(const struct trackpoint_accelerator *accel_filter,
- struct normalized_coords coords)
-{
- const double max_delta = accel_filter->max_delta;
-
- if (abs(coords.x) > max_delta)
- coords.x = copysign(max_delta, coords.x);
- if (abs(coords.y) > max_delta)
- coords.y = copysign(max_delta, coords.y);
-
- return coords;
-}
-
-static struct normalized_coords
-trackpoint_accelerator_filter(struct motion_filter *filter,
- const struct device_float_coords *unaccelerated,
- void *data, uint64_t time)
-{
- struct trackpoint_accelerator *accel_filter =
- (struct trackpoint_accelerator *)filter;
- struct device_float_coords scaled;
- struct device_float_coords avg;
- struct normalized_coords coords;
- double f;
- double delta;
-
- scaled = trackpoint_normalize_deltas(accel_filter, unaccelerated);
- avg = trackpoint_average_delta(accel_filter, &scaled);
-
- delta = hypot(avg.x, avg.y);
-
- f = trackpoint_accel_profile(filter, data, delta);
-
- coords.x = avg.x * f;
- coords.y = avg.y * f;
-
- coords = trackpoint_clip_to_max_delta(accel_filter, coords);
-
- return coords;
-}
-
-static struct normalized_coords
-trackpoint_accelerator_filter_noop(struct motion_filter *filter,
- const struct device_float_coords *unaccelerated,
- void *data, uint64_t time)
-{
-
- struct trackpoint_accelerator *accel_filter =
- (struct trackpoint_accelerator *)filter;
- struct device_float_coords scaled;
- struct device_float_coords avg;
- struct normalized_coords coords;
-
- scaled = trackpoint_normalize_deltas(accel_filter, unaccelerated);
- avg = trackpoint_average_delta(accel_filter, &scaled);
-
- coords.x = avg.x;
- coords.y = avg.y;
-
- coords = trackpoint_clip_to_max_delta(accel_filter, coords);
-
- return coords;
-}
-
-static bool
-trackpoint_accelerator_set_speed(struct motion_filter *filter,
- double speed_adjustment)
-{
- struct trackpoint_accelerator *accel_filter =
- (struct trackpoint_accelerator*)filter;
- double incline, offset, max;
-
- assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
-
- /* Helloooo, magic numbers.
-
- These numbers were obtained by finding an acceleration curve that
- provides precision at slow speeds but still provides a good
- acceleration at higher pressure - and a quick ramp-up to that
- acceleration.
-
- Trackpoints have built-in acceleration curves already, so we
- don't put a new function on top, we merely scale the output from
- those curves (re-calculating the pressure values from the
- firmware-defined curve and applying a new curve is unreliable).
-
- For that basic scaling, we assume a constant factor f based on
- the speed setting together with a maximum factor m (for this
- speed setting). Delta acceleration is thus:
- factor = max(m, f)
- accelerated_delta = delta * factor;
-
- Trial and error showed a couple of pairs that work well for the
- various speed settings (Lenovo T440, sensitivity 128):
-
- -1.0: f = 0.3, m = 1
- -0.5: f = 0.6, m = 2
- 0.0: f = 1.0, m = 6
- 0.5: f = 1.4, m = 8
- 1.0: f = 1.9, m = 15
-
- Note: if f >= 2.0, some pixels are unaddressable
-
- Those pairs were fed into the linear/exponential regression tool
- at http://www.xuru.org/rt/LR.asp and show two functions that map
- speed settings to the respective f and m.
- Given a speed setting s in [-1.0, 1.0]
- f(s) = 0.8 * s + 1.04
- m(s) = 4.6 * e**(1.2 * s)
- These are close enough to the tested pairs.
- */
-
- max = 4.6 * pow(M_E, 1.2 * speed_adjustment);
- incline = 0.8 * speed_adjustment + 1.04;
- offset = 0;
-
- accel_filter->max_accel = max;
- accel_filter->incline = incline;
- accel_filter->offset = offset;
- filter->speed_adjustment = speed_adjustment;
-
- return true;
-}
-
-static void
-trackpoint_accelerator_destroy(struct motion_filter *filter)
-{
- struct trackpoint_accelerator *accel_filter =
- (struct trackpoint_accelerator *)filter;
-
- free(accel_filter);
-}
-
-struct motion_filter_interface accelerator_interface_trackpoint = {
- .type = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE,
- .filter = trackpoint_accelerator_filter,
- .filter_constant = trackpoint_accelerator_filter_noop,
- .restart = NULL,
- .destroy = trackpoint_accelerator_destroy,
- .set_speed = trackpoint_accelerator_set_speed,
-};
-
-struct motion_filter *
-create_pointer_accelerator_filter_trackpoint(int max_hw_delta)
-{
- struct trackpoint_accelerator *filter;
-
- /* Trackpoints are special. They don't have a movement speed like a
- * mouse or a finger, instead they send a constant stream of events
- * based on the pressure applied.
- *
- * Physical ranges on a trackpoint are the max values for relative
- * deltas, but these are highly device-specific.
- *
- */
-
- filter = zalloc(sizeof *filter);
- if (!filter)
- return NULL;
-
- filter->history_size = ARRAY_LENGTH(filter->history);
- filter->scale_factor = 1.0 * TRACKPOINT_DEFAULT_RANGE / max_hw_delta;
- filter->max_accel = TRACKPOINT_DEFAULT_MAX_ACCEL;
- filter->max_delta = TRACKPOINT_DEFAULT_MAX_DELTA;
-
- filter->base.interface = &accelerator_interface_trackpoint;
-
- return &filter->base;
-}
-
static struct normalized_coords
accelerator_filter_flat(struct motion_filter *filter,
const struct device_float_coords *unaccelerated,
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