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3c7e3a1973
400 used to be the default DPI for many mice but it it's not anymore. A survey of mice shows that 400 is still common as one of the pre-configured settings in switchable multi-resolution gaming mice, but devices with a single resolution mostly favor 1000 dpi. Let's make that switch now so that any future changes to the pointer acceleration code assumes that resolution as a default. For the touchpad, this has a bad side-effect, caused by our expectation of mouse vs touchpad behaviours: our acceleration code ignores device type and provides the same acceleration for the same physical movement. Unfortunately, we expect touchpads to be significantly slower than mice. The previous 400 DPI worked because it caused an acceptable slowdown on input. e.g. on the T440 with a res of 42 units/mm, the scale coefficient was 0.37. For 1000 DPI as default, this now results in 0.94, i.e. speeding up the touchpad by a factor of 2.5. That is way too fast. Adding touchpad-specific filter code is a bigger project, so let's just add a fixme for now and scale the coefficient back to what it was before the DPI default change. Effect: touchpad behaves as before. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
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* Copyright © 2012 Jonas Ådahl
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of the copyright holders not be used in
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* advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The copyright holders make
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef FILTER_H
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#define FILTER_H
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#include "config.h"
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#include <stdbool.h>
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#include <stdint.h>
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/* The HW DPI rate we normalize to before calculating pointer acceleration */
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#define DEFAULT_MOUSE_DPI 1000
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struct motion_params {
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double dx, dy; /* in units/ms @ DEFAULT_MOUSE_DPI resolution */
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};
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struct motion_filter;
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void
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filter_dispatch(struct motion_filter *filter,
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struct motion_params *motion,
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void *data, uint64_t time);
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void
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filter_destroy(struct motion_filter *filter);
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bool
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filter_set_speed(struct motion_filter *filter,
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double speed);
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double
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filter_get_speed(struct motion_filter *filter);
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typedef double (*accel_profile_func_t)(struct motion_filter *filter,
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void *data,
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double velocity,
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uint64_t time);
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struct motion_filter *
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create_pointer_accelerator_filter(accel_profile_func_t filter);
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/*
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* Pointer acceleration profiles.
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*/
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double
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pointer_accel_profile_linear(struct motion_filter *filter,
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void *data,
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double speed_in,
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uint64_t time);
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#endif /* FILTER_H */
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