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Starting with kernel v5.0 two new axes are available for high-resolution wheel scrolling: REL_WHEEL_HI_RES and REL_HWHEEL_HI_RES. Both axes send data in fractions of 120 where each multiple of 120 amounts to one logical scroll event. Fractions of 120 indicate a wheel movement less than one detent. This commit adds a new API for scroll events. Three new event types that encode the axis source in the event type name and a new API to get a normalized-to-120 value that also used by Windows and the kernel (each multiple of 120 represents a logical scroll click). This addresses a main shortcoming with the existing API - it was unreliable to calculate the click angle based on the axis value+discrete events and thus any caller using the axis value alone would be left with some ambiguity. With the v120 API it's now possible to (usually) calculate the click angle, but more importantly it provides the simplest hw-independent way of scrolling by a click or a fraction of a click. A new event type is required, the only way to integrate the v120 value otherwise was to start sending events with a discrete value of 0. This would break existing xf86-input-libinput (divide by zero, fixed in 0.28.2) and weston (general confusion). mutter, kwin are unaffected. With the new API, the old POINTER_AXIS event are deprecated - callers should use the new API where available and discard any POINTER_AXIS events. Notable: REL_WHEEL/REL_HWHEEL are emulated by the kernel but there's no guarantee that they'll come every accumulated 120 values, e.g. Logitech mice often send events that don't add up to 120 per detent. We use the kernel's wheel click emulation instead of doing our own. libinput guarantees high-resolution events even on pre-5.0 kernels. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Signed-off-by: José Expósito <jose.exposito89@gmail.com>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* Copyright © 2015 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "config.h"
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#include "litest.h"
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#include "litest-int.h"
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static struct input_id input_id = {
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.bustype = 0x3,
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.vendor = 0x1,
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.product = 0x1,
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};
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static int events[] = {
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EV_KEY, BTN_LEFT,
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EV_KEY, BTN_RIGHT,
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EV_KEY, BTN_MIDDLE,
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EV_REL, REL_X,
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EV_REL, REL_Y,
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EV_REL, REL_WHEEL,
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EV_REL, REL_WHEEL_HI_RES,
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EV_REL, REL_HWHEEL,
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EV_REL, REL_HWHEEL_HI_RES,
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-1 , -1,
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};
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TEST_DEVICE("low-dpi-mouse",
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.type = LITEST_MOUSE_LOW_DPI,
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.features = LITEST_RELATIVE | LITEST_BUTTON | LITEST_WHEEL,
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.interface = NULL,
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.name = "Low DPI Mouse",
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.id = &input_id,
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.absinfo = NULL,
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.events = events,
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.udev_properties = {
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{ "MOUSE_DPI", "400@125" },
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{ NULL },
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},
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)
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