[PATCH weston] evdev: Mouse speed and acceleration
Daniel Stone
daniel at fooishbar.org
Wed Jul 17 10:53:42 PDT 2013
Hi,
Did anything happen with these? Additionally, the tuning seems a
little hostile: if we have a subset of known-good values, we should
probably mostly stick to those. Really, I'd just love to see a 1-10
'speed' configuration item that just does the right thing, rather than
having to guess the magic number.
Cheers,
Daniel
On 3 April 2013 05:17, Daniel Stone <daniel at fooishbar.org> wrote:
> Hi Martin,
> By and large this looks good to me, although the main comment I have
> is that this should probably be using the acceleration mechanism in
> src/filter.c.
>
> Cheers,
> Daniel
>
> On 29 March 2013 20:47, Martin Minarik <minarik11 at student.fiit.stuba.sk> wrote:
>> Acceleration: After examining, I don't like the X acceleration
>> approach. X employs a so called velocity approximation (?)
>> algorithm. It is quite a complex way to get an approximation of
>> a simple thing, the velocity, when we can compute the velocity
>> directly.
>>
>> Configuring: Please, tune the values in mouse_init().
>>
>> The tune speed coefficient is simply a multiplier of how fast
>> the mouse moves. The 1.0 is the real (raw) device speed.
>> These tune speed coefficients feel very natural to use:
>>
>> 0.03125 0.0625 0.25 0.5 0.75 1.0 1.5 2.0 2.5 3.0 3.5
>>
>> The acceleration boost factor (at 1.0 speed coefficient):
>>
>> 0.01 - NO effect
>> 0.02 - small effect
>> 0.06 - medium effect
>> 0.10 - pretty strong
>> 0.13 - TOO strong
>>
>> This patch does not introduce smoothing.
>> ---
>> src/Makefile.am | 4 +
>> src/evdev-mouse.c | 240 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>> src/evdev.c | 3 +
>> src/evdev.h | 3 +
>> 4 files changed, 250 insertions(+)
>> create mode 100644 src/evdev-mouse.c
>>
>> diff --git a/src/Makefile.am b/src/Makefile.am
>> index d56daa0..2c8b3eb 100644
>> --- a/src/Makefile.am
>> +++ b/src/Makefile.am
>> @@ -138,6 +138,7 @@ drm_backend_la_SOURCES = \
>> udev-seat.h \
>> evdev.c \
>> evdev.h \
>> + evdev-mouse.c \
>> evdev-touchpad.c \
>> launcher-util.c \
>> launcher-util.h \
>> @@ -177,7 +178,9 @@ rpi_backend_la_SOURCES = \
>> tty.c \
>> evdev.c \
>> evdev.h \
>> + evdev-mouse.c \
>> evdev-touchpad.c
>> +
>> endif
>>
>> if ENABLE_HEADLESS_COMPOSITOR
>> @@ -211,6 +214,7 @@ fbdev_backend_la_SOURCES = \
>> evdev.c \
>> evdev.h \
>> evdev-touchpad.c \
>> + evdev-mouse.c \
>> launcher-util.c
>> endif
>>
>> diff --git a/src/evdev-mouse.c b/src/evdev-mouse.c
>> new file mode 100644
>> index 0000000..b4915cd
>> --- /dev/null
>> +++ b/src/evdev-mouse.c
>> @@ -0,0 +1,240 @@
>> +#include <stdlib.h>
>> +#include <stdbool.h>
>> +
>> +#include "compositor.h"
>> +#include "evdev.h"
>> +
>> +#define DEFAULT_AXIS_STEP_DISTANCE wl_fixed_from_int(10)
>> +#define MOUSE_VELOCITY_SAMPLING_INTERVAL 20
>> +
>> +struct mouse_motion {
>> + int32_t dx;
>> + int32_t dy;
>> +};
>> +
>> +struct mouse_dispatch {
>> + struct evdev_dispatch base;
>> + struct evdev_device *device;
>> +
>> + double actual_speed;
>> +
>> + struct mouse_motion motion_sample;
>> + uint32_t motion_time_next_sample;
>> + uint32_t motion_time_out;
>> + unsigned long int last_velocity_sq;
>> +
>> + /* tuneable */
>> + bool tune_is_acceleration;
>> + double tune_acceleration_boost;
>> + double tune_speed_coefficient;
>> +};
>> +
>> +static inline void
>> +mouse_process_relative(struct mouse_dispatch *mouse,
>> + struct evdev_device *device,
>> + struct input_event *event, uint32_t time)
>> +{
>> + switch (event->code) {
>> + case REL_X:
>> + if (mouse->tune_is_acceleration)
>> + mouse->motion_sample.dx += event->value;
>> + device->rel.dx += wl_fixed_from_double(
>> + (double) event->value * mouse->actual_speed);
>> +
>> + device->pending_events |= EVDEV_RELATIVE_MOTION;
>> + break;
>> + case REL_Y:
>> + if (mouse->tune_is_acceleration)
>> + mouse->motion_sample.dy += event->value;
>> + device->rel.dy += wl_fixed_from_double(
>> + (double) event->value * mouse->actual_speed);
>> +
>> + device->pending_events |= EVDEV_RELATIVE_MOTION;
>> + break;
>> + case REL_WHEEL:
>> + switch (event->value) {
>> + case -1:
>> + /* Scroll down */
>> + case 1:
>> + /* Scroll up */
>> + notify_axis(device->seat,
>> + time,
>> + WL_POINTER_AXIS_VERTICAL_SCROLL,
>> + -1 * event->value * DEFAULT_AXIS_STEP_DISTANCE);
>> + break;
>> + default:
>> + break;
>> + }
>> + break;
>> + case REL_HWHEEL:
>> + switch (event->value) {
>> + case -1:
>> + /* Scroll left */
>> + case 1:
>> + /* Scroll right */
>> + notify_axis(device->seat,
>> + time,
>> + WL_POINTER_AXIS_HORIZONTAL_SCROLL,
>> + event->value * DEFAULT_AXIS_STEP_DISTANCE);
>> + break;
>> + default:
>> + break;
>> +
>> + }
>> + }
>> +}
>> +
>> +static inline void
>> +mouse_process_key(struct mouse_dispatch *mouse,
>> + struct evdev_device *device,
>> + struct input_event *e,
>> + uint32_t time)
>> +{
>> + if (e->value == 2)
>> + return;
>> +
>> + switch (e->code) {
>> + case BTN_LEFT:
>> + case BTN_RIGHT:
>> + case BTN_MIDDLE:
>> + case BTN_SIDE:
>> + case BTN_EXTRA:
>> + case BTN_FORWARD:
>> + case BTN_BACK:
>> + case BTN_TASK:
>> + notify_button(device->seat,
>> + time, e->code,
>> + e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
>> + WL_POINTER_BUTTON_STATE_RELEASED);
>> + break;
>> +
>> + default:
>> + notify_key(device->seat,
>> + time, e->code,
>> + e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
>> + WL_KEYBOARD_KEY_STATE_RELEASED,
>> + STATE_UPDATE_AUTOMATIC);
>> + break;
>> + }
>> +}
>> +
>> +static void
>> +mouse_reset_acceleration(struct mouse_dispatch *mouse, uint32_t time)
>> +{
>> + struct mouse_motion *m = &mouse->motion_sample;
>> + unsigned const int interval = MOUSE_VELOCITY_SAMPLING_INTERVAL;
>> +
>> + mouse->last_velocity_sq = 0;
>> + mouse->actual_speed = mouse->tune_speed_coefficient;
>> + mouse->motion_time_out = 2 * interval + time;
>> + mouse->motion_time_next_sample = interval + time;
>> +
>> + m->dx = 0;
>> + m->dy = 0;
>> +}
>> +
>> +static void
>> +mouse_recompute_acceleration(struct mouse_dispatch *mouse, uint32_t time)
>> +{
>> + struct mouse_motion *m = &mouse->motion_sample;
>> + unsigned const int interval = MOUSE_VELOCITY_SAMPLING_INTERVAL;
>> +
>> + unsigned long int velocity_sq;
>> + const double no_decceleration = 1.0;
>> + double acceleration;
>> +
>> + velocity_sq = m->dx * m->dx + m->dy * m->dy;
>> +
>> + if (velocity_sq > mouse->last_velocity_sq)
>> + acceleration = pow(velocity_sq - mouse->last_velocity_sq,
>> + mouse->tune_acceleration_boost);
>> + else
>> + acceleration = no_decceleration;
>> +
>> + mouse->last_velocity_sq = velocity_sq;
>> + mouse->actual_speed = mouse->tune_speed_coefficient * acceleration;
>> + mouse->motion_time_out += interval;
>> + mouse->motion_time_next_sample += interval;
>> +
>> + m->dx = 0;
>> + m->dy = 0;
>> +}
>> +
>> +static void
>> +mouse_process(struct evdev_dispatch *dispatch,
>> + struct evdev_device *device,
>> + struct input_event *event,
>> + uint32_t time)
>> +{
>> + struct mouse_dispatch *mouse =
>> + (struct mouse_dispatch *) dispatch;
>> +
>> + switch (event->type) {
>> + case EV_REL:
>> + mouse_process_relative(mouse, device, event, time);
>> + break;
>> + case EV_KEY:
>> + mouse_process_key(mouse, device, event, time);
>> + break;
>> + case EV_SYN:
>> + device->pending_events |= EVDEV_SYN;
>> +
>> + if ((mouse->tune_is_acceleration) &&
>> + (time > mouse->motion_time_next_sample)) {
>> + if (time > mouse->motion_time_out)
>> + mouse_reset_acceleration(mouse, time);
>> + else
>> + mouse_recompute_acceleration(mouse, time);
>> + }
>> + break;
>> + }
>> +}
>> +
>> +static void
>> +mouse_destroy(struct evdev_dispatch *dispatch)
>> +{
>> + struct mouse_dispatch *mouse =
>> + (struct mouse_dispatch *) dispatch;
>> +
>> + free(mouse);
>> +}
>> +
>> +struct evdev_dispatch_interface mouse_interface = {
>> + mouse_process,
>> + mouse_destroy
>> +};
>> +
>> +static int
>> +mouse_init(struct mouse_dispatch *mouse,
>> + struct evdev_device *device)
>> +{
>> + mouse->base.interface = &mouse_interface;
>> + mouse->device = device;
>> +
>> + /* Configure mouse velocity, acceleration */
>> + mouse->tune_is_acceleration = true;
>> + mouse->tune_acceleration_boost = 0.03;
>> + mouse->tune_speed_coefficient = 2.00;
>> +
>> + /* Prepare velocity tracking */
>> + mouse_reset_acceleration(mouse, 0);
>> +
>> + return 0;
>> +}
>> +
>> +struct evdev_dispatch *
>> +evdev_mouse_create(struct evdev_device *device)
>> +{
>> + struct mouse_dispatch *mouse;
>> +
>> + mouse = malloc(sizeof *mouse);
>> + if (mouse == NULL)
>> + return NULL;
>> +
>> + if (mouse_init(mouse, device) != 0) {
>> + free(mouse);
>> + return NULL;
>> + }
>> +
>> + return &mouse->base;
>> +}
>> diff --git a/src/evdev.c b/src/evdev.c
>> index d2954b5..bbad5ad 100644
>> --- a/src/evdev.c
>> +++ b/src/evdev.c
>> @@ -459,6 +459,9 @@ evdev_handle_device(struct evdev_device *device)
>> !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
>> has_abs)
>> device->dispatch = evdev_touchpad_create(device);
>> + else if (TEST_BIT(key_bits, BTN_LEFT) && !has_abs)
>> + device->dispatch = evdev_mouse_create(device);
>> +
>> for (i = KEY_ESC; i < KEY_MAX; i++) {
>> if (i >= BTN_MISC && i < KEY_OK)
>> continue;
>> diff --git a/src/evdev.h b/src/evdev.h
>> index eb5c868..f670682 100644
>> --- a/src/evdev.h
>> +++ b/src/evdev.h
>> @@ -111,6 +111,9 @@ struct evdev_dispatch {
>> struct evdev_dispatch *
>> evdev_touchpad_create(struct evdev_device *device);
>>
>> +struct evdev_dispatch *
>> +evdev_mouse_create(struct evdev_device *device);
>> +
>> void
>> evdev_led_update(struct evdev_device *device, enum weston_led leds);
>>
>> --
>> 1.7.10.4
>>
>> _______________________________________________
>> wayland-devel mailing list
>> wayland-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/wayland-devel
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