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qt6-bb10/src/platformsupport/input/evdevtouch/qevdevtouchhandler.cpp

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2016 Jolla Ltd, author: <gunnar.sletta@jollamobile.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qevdevtouchhandler_p.h"
#include "qtouchoutputmapping_p.h"
#include <QStringList>
#include <QHash>
#include <QSocketNotifier>
#include <QGuiApplication>
#include <QTouchDevice>
#include <QLoggingCategory>
#include <QtCore/private/qcore_unix_p.h>
#include <QtGui/private/qhighdpiscaling_p.h>
#include <QtGui/private/qguiapplication_p.h>
#ifdef Q_OS_FREEBSD
#include <dev/evdev/input.h>
#else
#include <linux/input.h>
#endif
#include <math.h>
#if QT_CONFIG(mtdev)
extern "C" {
#include <mtdev.h>
}
#endif
QT_BEGIN_NAMESPACE
Q_LOGGING_CATEGORY(qLcEvdevTouch, "qt.qpa.input")
/* android (and perhaps some other linux-derived stuff) don't define everything
* in linux/input.h, so we'll need to do that ourselves.
*/
#ifndef ABS_MT_TOUCH_MAJOR
#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
#endif
#ifndef ABS_MT_POSITION_X
#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
#endif
#ifndef ABS_MT_POSITION_Y
#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
#endif
#ifndef ABS_MT_SLOT
#define ABS_MT_SLOT 0x2f
#endif
#ifndef ABS_CNT
#define ABS_CNT (ABS_MAX+1)
#endif
#ifndef ABS_MT_TRACKING_ID
#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
#endif
#ifndef SYN_MT_REPORT
#define SYN_MT_REPORT 2
#endif
class QEvdevTouchScreenData
{
public:
QEvdevTouchScreenData(QEvdevTouchScreenHandler *q_ptr, const QStringList &args);
void processInputEvent(input_event *data);
void assignIds();
QEvdevTouchScreenHandler *q;
int m_lastEventType;
QList<QWindowSystemInterface::TouchPoint> m_touchPoints;
QList<QWindowSystemInterface::TouchPoint> m_lastTouchPoints;
struct Contact {
int trackingId;
int x;
int y;
int maj;
int pressure;
Qt::TouchPointState state;
QTouchEvent::TouchPoint::InfoFlags flags;
Contact() : trackingId(-1),
x(0), y(0), maj(-1), pressure(0),
state(Qt::TouchPointPressed), flags(0) { }
};
QHash<int, Contact> m_contacts; // The key is a tracking id for type A, slot number for type B.
QHash<int, Contact> m_lastContacts;
Contact m_currentData;
int m_currentSlot;
double m_timeStamp;
double m_lastTimeStamp;
int findClosestContact(const QHash<int, Contact> &contacts, int x, int y, int *dist);
void addTouchPoint(const Contact &contact, Qt::TouchPointStates *combinedStates);
void reportPoints();
void loadMultiScreenMappings();
QRect screenGeometry() const;
int hw_range_x_min;
int hw_range_x_max;
int hw_range_y_min;
int hw_range_y_max;
int hw_pressure_min;
int hw_pressure_max;
QString hw_name;
QString deviceNode;
bool m_forceToActiveWindow;
bool m_typeB;
QTransform m_rotate;
bool m_singleTouch;
QString m_screenName;
mutable QPointer<QScreen> m_screen;
// Touch filtering and prediction are part of the same thing. The default
// prediction is 0ms, but sensible results can be achieved by setting it
// to, for instance, 16ms.
// For filtering to work well, the QPA plugin should provide a dead-steady
// implementation of QPlatformWindow::requestUpdate().
bool m_filtered;
int m_prediction;
// When filtering is enabled, protect the access to current and last
// timeStamp and touchPoints, as these are being read on the gui thread.
QMutex m_mutex;
};
QEvdevTouchScreenData::QEvdevTouchScreenData(QEvdevTouchScreenHandler *q_ptr, const QStringList &args)
: q(q_ptr),
m_lastEventType(-1),
m_currentSlot(0),
m_timeStamp(0), m_lastTimeStamp(0),
hw_range_x_min(0), hw_range_x_max(0),
hw_range_y_min(0), hw_range_y_max(0),
hw_pressure_min(0), hw_pressure_max(0),
m_forceToActiveWindow(false), m_typeB(false), m_singleTouch(false),
m_filtered(false), m_prediction(0)
{
for (const QString &arg : args) {
if (arg == QStringLiteral("force_window"))
m_forceToActiveWindow = true;
else if (arg == QStringLiteral("filtered"))
m_filtered = true;
else if (arg.startsWith(QStringLiteral("prediction=")))
m_prediction = arg.mid(11).toInt();
}
}
#define LONG_BITS (sizeof(long) << 3)
#define NUM_LONGS(bits) (((bits) + LONG_BITS - 1) / LONG_BITS)
#if !QT_CONFIG(mtdev)
static inline bool testBit(long bit, const long *array)
{
return (array[bit / LONG_BITS] >> bit % LONG_BITS) & 1;
}
#endif
QEvdevTouchScreenHandler::QEvdevTouchScreenHandler(const QString &device, const QString &spec, QObject *parent)
: QObject(parent), m_notify(nullptr), m_fd(-1), d(nullptr), m_device(nullptr)
#if QT_CONFIG(mtdev)
, m_mtdev(nullptr)
#endif
{
setObjectName(QLatin1String("Evdev Touch Handler"));
const QStringList args = spec.split(QLatin1Char(':'));
int rotationAngle = 0;
bool invertx = false;
bool inverty = false;
for (int i = 0; i < args.count(); ++i) {
if (args.at(i).startsWith(QLatin1String("rotate"))) {
QString rotateArg = args.at(i).section(QLatin1Char('='), 1, 1);
bool ok;
uint argValue = rotateArg.toUInt(&ok);
if (ok) {
switch (argValue) {
case 90:
case 180:
case 270:
rotationAngle = argValue;
default:
break;
}
}
} else if (args.at(i) == QLatin1String("invertx")) {
invertx = true;
} else if (args.at(i) == QLatin1String("inverty")) {
inverty = true;
}
}
qCDebug(qLcEvdevTouch, "evdevtouch: Using device %s", qPrintable(device));
m_fd = QT_OPEN(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
if (m_fd >= 0) {
m_notify = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);
connect(m_notify, &QSocketNotifier::activated, this, &QEvdevTouchScreenHandler::readData);
} else {
qErrnoWarning(errno, "evdevtouch: Cannot open input device %s", qPrintable(device));
return;
}
#if QT_CONFIG(mtdev)
m_mtdev = static_cast<mtdev *>(calloc(1, sizeof(mtdev)));
int mtdeverr = mtdev_open(m_mtdev, m_fd);
if (mtdeverr) {
qWarning("evdevtouch: mtdev_open failed: %d", mtdeverr);
QT_CLOSE(m_fd);
return;
}
#endif
d = new QEvdevTouchScreenData(this, args);
#if QT_CONFIG(mtdev)
const char *mtdevStr = "(mtdev)";
d->m_typeB = true;
#else
const char *mtdevStr = "";
long absbits[NUM_LONGS(ABS_CNT)];
if (ioctl(m_fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits) >= 0) {
d->m_typeB = testBit(ABS_MT_SLOT, absbits);
d->m_singleTouch = !testBit(ABS_MT_POSITION_X, absbits);
}
#endif
d->deviceNode = device;
qCDebug(qLcEvdevTouch,
"evdevtouch: %s: Protocol type %c %s (%s), filtered=%s",
qPrintable(d->deviceNode),
d->m_typeB ? 'B' : 'A', mtdevStr,
d->m_singleTouch ? "single" : "multi",
d->m_filtered ? "yes" : "no");
if (d->m_filtered)
qCDebug(qLcEvdevTouch, " - prediction=%d", d->m_prediction);
input_absinfo absInfo;
memset(&absInfo, 0, sizeof(input_absinfo));
bool has_x_range = false, has_y_range = false;
if (ioctl(m_fd, EVIOCGABS((d->m_singleTouch ? ABS_X : ABS_MT_POSITION_X)), &absInfo) >= 0) {
qCDebug(qLcEvdevTouch, "evdevtouch: %s: min X: %d max X: %d", qPrintable(device),
absInfo.minimum, absInfo.maximum);
d->hw_range_x_min = absInfo.minimum;
d->hw_range_x_max = absInfo.maximum;
has_x_range = true;
}
if (ioctl(m_fd, EVIOCGABS((d->m_singleTouch ? ABS_Y : ABS_MT_POSITION_Y)), &absInfo) >= 0) {
qCDebug(qLcEvdevTouch, "evdevtouch: %s: min Y: %d max Y: %d", qPrintable(device),
absInfo.minimum, absInfo.maximum);
d->hw_range_y_min = absInfo.minimum;
d->hw_range_y_max = absInfo.maximum;
has_y_range = true;
}
if (!has_x_range || !has_y_range)
qWarning("evdevtouch: %s: Invalid ABS limits, behavior unspecified", qPrintable(device));
if (ioctl(m_fd, EVIOCGABS(ABS_PRESSURE), &absInfo) >= 0) {
qCDebug(qLcEvdevTouch, "evdevtouch: %s: min pressure: %d max pressure: %d", qPrintable(device),
absInfo.minimum, absInfo.maximum);
if (absInfo.maximum > absInfo.minimum) {
d->hw_pressure_min = absInfo.minimum;
d->hw_pressure_max = absInfo.maximum;
}
}
char name[1024];
if (ioctl(m_fd, EVIOCGNAME(sizeof(name) - 1), name) >= 0) {
d->hw_name = QString::fromLocal8Bit(name);
qCDebug(qLcEvdevTouch, "evdevtouch: %s: device name: %s", qPrintable(device), name);
}
// Fix up the coordinate ranges for am335x in case the kernel driver does not have them fixed.
if (d->hw_name == QLatin1String("ti-tsc")) {
if (d->hw_range_x_min == 0 && d->hw_range_x_max == 4095) {
d->hw_range_x_min = 165;
d->hw_range_x_max = 4016;
}
if (d->hw_range_y_min == 0 && d->hw_range_y_max == 4095) {
d->hw_range_y_min = 220;
d->hw_range_y_max = 3907;
}
qCDebug(qLcEvdevTouch, "evdevtouch: found ti-tsc, overriding: min X: %d max X: %d min Y: %d max Y: %d",
d->hw_range_x_min, d->hw_range_x_max, d->hw_range_y_min, d->hw_range_y_max);
}
bool grabSuccess = !ioctl(m_fd, EVIOCGRAB, (void *) 1);
if (grabSuccess)
ioctl(m_fd, EVIOCGRAB, (void *) 0);
else
qWarning("evdevtouch: The device is grabbed by another process. No events will be read.");
if (rotationAngle)
d->m_rotate = QTransform::fromTranslate(0.5, 0.5).rotate(rotationAngle).translate(-0.5, -0.5);
if (invertx)
d->m_rotate *= QTransform::fromTranslate(0.5, 0.5).scale(-1.0, 1.0).translate(-0.5, -0.5);
if (inverty)
d->m_rotate *= QTransform::fromTranslate(0.5, 0.5).scale(1.0, -1.0).translate(-0.5, -0.5);
QTouchOutputMapping mapping;
if (mapping.load()) {
d->m_screenName = mapping.screenNameForDeviceNode(d->deviceNode);
if (!d->m_screenName.isEmpty())
qCDebug(qLcEvdevTouch, "evdevtouch: Mapping device %s to screen %s",
qPrintable(d->deviceNode), qPrintable(d->m_screenName));
}
registerTouchDevice();
}
QEvdevTouchScreenHandler::~QEvdevTouchScreenHandler()
{
#if QT_CONFIG(mtdev)
if (m_mtdev) {
mtdev_close(m_mtdev);
free(m_mtdev);
}
#endif
if (m_fd >= 0)
QT_CLOSE(m_fd);
delete d;
unregisterTouchDevice();
}
bool QEvdevTouchScreenHandler::isFiltered() const
{
return d && d->m_filtered;
}
QTouchDevice *QEvdevTouchScreenHandler::touchDevice() const
{
return m_device;
}
void QEvdevTouchScreenHandler::readData()
{
::input_event buffer[32];
int events = 0;
#if QT_CONFIG(mtdev)
forever {
do {
events = mtdev_get(m_mtdev, m_fd, buffer, sizeof(buffer) / sizeof(::input_event));
// keep trying mtdev_get if we get interrupted. note that we do not
// (and should not) handle EAGAIN; EAGAIN means that reading would
// block and we'll get back here later to try again anyway.
} while (events == -1 && errno == EINTR);
// 0 events is EOF, -1 means error, handle both in the same place
if (events <= 0)
goto err;
// process our shiny new events
for (int i = 0; i < events; ++i)
d->processInputEvent(&buffer[i]);
// and try to get more
}
#else
int n = 0;
for (; ;) {
events = QT_READ(m_fd, reinterpret_cast<char*>(buffer) + n, sizeof(buffer) - n);
if (events <= 0)
goto err;
n += events;
if (n % sizeof(::input_event) == 0)
break;
}
n /= sizeof(::input_event);
for (int i = 0; i < n; ++i)
d->processInputEvent(&buffer[i]);
#endif
return;
err:
if (!events) {
qWarning("evdevtouch: Got EOF from input device");
return;
} else if (events < 0) {
if (errno != EINTR && errno != EAGAIN) {
qErrnoWarning(errno, "evdevtouch: Could not read from input device");
if (errno == ENODEV) { // device got disconnected -> stop reading
delete m_notify;
m_notify = nullptr;
QT_CLOSE(m_fd);
m_fd = -1;
unregisterTouchDevice();
}
return;
}
}
}
void QEvdevTouchScreenHandler::registerTouchDevice()
{
if (m_device)
return;
m_device = new QTouchDevice;
m_device->setName(d->hw_name);
m_device->setType(QTouchDevice::TouchScreen);
m_device->setCapabilities(QTouchDevice::Position | QTouchDevice::Area);
if (d->hw_pressure_max > d->hw_pressure_min)
m_device->setCapabilities(m_device->capabilities() | QTouchDevice::Pressure);
QWindowSystemInterface::registerTouchDevice(m_device);
}
void QEvdevTouchScreenHandler::unregisterTouchDevice()
{
if (!m_device)
return;
// At app exit the cleanup may have already been done, avoid
// double delete by checking the list first.
if (QWindowSystemInterface::isTouchDeviceRegistered(m_device)) {
QWindowSystemInterface::unregisterTouchDevice(m_device);
delete m_device;
}
m_device = nullptr;
}
void QEvdevTouchScreenData::addTouchPoint(const Contact &contact, Qt::TouchPointStates *combinedStates)
{
QWindowSystemInterface::TouchPoint tp;
tp.id = contact.trackingId;
tp.flags = contact.flags;
tp.state = contact.state;
*combinedStates |= tp.state;
// Store the HW coordinates for now, will be updated later.
tp.area = QRectF(0, 0, contact.maj, contact.maj);
tp.area.moveCenter(QPoint(contact.x, contact.y));
tp.pressure = contact.pressure;
// Get a normalized position in range 0..1.
tp.normalPosition = QPointF((contact.x - hw_range_x_min) / qreal(hw_range_x_max - hw_range_x_min),
(contact.y - hw_range_y_min) / qreal(hw_range_y_max - hw_range_y_min));
if (!m_rotate.isIdentity())
tp.normalPosition = m_rotate.map(tp.normalPosition);
tp.rawPositions.append(QPointF(contact.x, contact.y));
m_touchPoints.append(tp);
}
void QEvdevTouchScreenData::processInputEvent(input_event *data)
{
if (data->type == EV_ABS) {
if (data->code == ABS_MT_POSITION_X || (m_singleTouch && data->code == ABS_X)) {
m_currentData.x = qBound(hw_range_x_min, data->value, hw_range_x_max);
if (m_singleTouch)
m_contacts[m_currentSlot].x = m_currentData.x;
if (m_typeB) {
m_contacts[m_currentSlot].x = m_currentData.x;
if (m_contacts[m_currentSlot].state == Qt::TouchPointStationary)
m_contacts[m_currentSlot].state = Qt::TouchPointMoved;
}
} else if (data->code == ABS_MT_POSITION_Y || (m_singleTouch && data->code == ABS_Y)) {
m_currentData.y = qBound(hw_range_y_min, data->value, hw_range_y_max);
if (m_singleTouch)
m_contacts[m_currentSlot].y = m_currentData.y;
if (m_typeB) {
m_contacts[m_currentSlot].y = m_currentData.y;
if (m_contacts[m_currentSlot].state == Qt::TouchPointStationary)
m_contacts[m_currentSlot].state = Qt::TouchPointMoved;
}
} else if (data->code == ABS_MT_TRACKING_ID) {
m_currentData.trackingId = data->value;
if (m_typeB) {
if (m_currentData.trackingId == -1) {
m_contacts[m_currentSlot].state = Qt::TouchPointReleased;
} else {
m_contacts[m_currentSlot].state = Qt::TouchPointPressed;
m_contacts[m_currentSlot].trackingId = m_currentData.trackingId;
}
}
} else if (data->code == ABS_MT_TOUCH_MAJOR) {
m_currentData.maj = data->value;
if (data->value == 0)
m_currentData.state = Qt::TouchPointReleased;
if (m_typeB)
m_contacts[m_currentSlot].maj = m_currentData.maj;
} else if (data->code == ABS_PRESSURE || data->code == ABS_MT_PRESSURE) {
m_currentData.pressure = qBound(hw_pressure_min, data->value, hw_pressure_max);
if (m_typeB || m_singleTouch)
m_contacts[m_currentSlot].pressure = m_currentData.pressure;
} else if (data->code == ABS_MT_SLOT) {
m_currentSlot = data->value;
}
} else if (data->type == EV_KEY && !m_typeB) {
if (data->code == BTN_TOUCH && data->value == 0)
m_contacts[m_currentSlot].state = Qt::TouchPointReleased;
} else if (data->type == EV_SYN && data->code == SYN_MT_REPORT && m_lastEventType != EV_SYN) {
// If there is no tracking id, one will be generated later.
// Until that use a temporary key.
int key = m_currentData.trackingId;
if (key == -1)
key = m_contacts.count();
m_contacts.insert(key, m_currentData);
m_currentData = Contact();
} else if (data->type == EV_SYN && data->code == SYN_REPORT) {
// Ensure valid IDs even when the driver does not report ABS_MT_TRACKING_ID.
if (!m_contacts.isEmpty() && m_contacts.constBegin().value().trackingId == -1)
assignIds();
if (m_filtered)
m_mutex.lock();
// update timestamps
m_lastTimeStamp = m_timeStamp;
m_timeStamp = data->time.tv_sec + data->time.tv_usec / 1000000.0;
m_lastTouchPoints = m_touchPoints;
m_touchPoints.clear();
Qt::TouchPointStates combinedStates;
QMutableHashIterator<int, Contact> it(m_contacts);
while (it.hasNext()) {
it.next();
Contact &contact(it.value());
if (!contact.state)
continue;
int key = m_typeB ? it.key() : contact.trackingId;
if (!m_typeB && m_lastContacts.contains(key)) {
const Contact &prev(m_lastContacts.value(key));
if (contact.state == Qt::TouchPointReleased) {
// Copy over the previous values for released points, just in case.
contact.x = prev.x;
contact.y = prev.y;
contact.maj = prev.maj;
} else {
contact.state = (prev.x == contact.x && prev.y == contact.y)
? Qt::TouchPointStationary : Qt::TouchPointMoved;
}
}
// Avoid reporting a contact in released state more than once.
if (!m_typeB && contact.state == Qt::TouchPointReleased
&& !m_lastContacts.contains(key)) {
it.remove();
continue;
}
addTouchPoint(contact, &combinedStates);
}
// Now look for contacts that have disappeared since the last sync.
it = m_lastContacts;
while (it.hasNext()) {
it.next();
Contact &contact(it.value());
int key = m_typeB ? it.key() : contact.trackingId;
if (m_typeB) {
if (contact.trackingId != m_contacts[key].trackingId && contact.state) {
contact.state = Qt::TouchPointReleased;
addTouchPoint(contact, &combinedStates);
}
} else {
if (!m_contacts.contains(key)) {
contact.state = Qt::TouchPointReleased;
addTouchPoint(contact, &combinedStates);
}
}
}
// Remove contacts that have just been reported as released.
it = m_contacts;
while (it.hasNext()) {
it.next();
Contact &contact(it.value());
if (!contact.state)
continue;
if (contact.state == Qt::TouchPointReleased) {
if (m_typeB)
contact.state = static_cast<Qt::TouchPointState>(0);
else
it.remove();
} else {
contact.state = Qt::TouchPointStationary;
}
}
m_lastContacts = m_contacts;
if (!m_typeB && !m_singleTouch)
m_contacts.clear();
if (!m_touchPoints.isEmpty() && combinedStates != Qt::TouchPointStationary)
reportPoints();
if (m_filtered)
m_mutex.unlock();
}
m_lastEventType = data->type;
}
int QEvdevTouchScreenData::findClosestContact(const QHash<int, Contact> &contacts, int x, int y, int *dist)
{
int minDist = -1, id = -1;
for (QHash<int, Contact>::const_iterator it = contacts.constBegin(), ite = contacts.constEnd();
it != ite; ++it) {
const Contact &contact(it.value());
int dx = x - contact.x;
int dy = y - contact.y;
int dist = dx * dx + dy * dy;
if (minDist == -1 || dist < minDist) {
minDist = dist;
id = contact.trackingId;
}
}
if (dist)
*dist = minDist;
return id;
}
void QEvdevTouchScreenData::assignIds()
{
QHash<int, Contact> candidates = m_lastContacts, pending = m_contacts, newContacts;
int maxId = -1;
QHash<int, Contact>::iterator it, ite, bestMatch;
while (!pending.isEmpty() && !candidates.isEmpty()) {
int bestDist = -1, bestId = 0;
for (it = pending.begin(), ite = pending.end(); it != ite; ++it) {
int dist;
int id = findClosestContact(candidates, it->x, it->y, &dist);
if (id >= 0 && (bestDist == -1 || dist < bestDist)) {
bestDist = dist;
bestId = id;
bestMatch = it;
}
}
if (bestDist >= 0) {
bestMatch->trackingId = bestId;
newContacts.insert(bestId, *bestMatch);
candidates.remove(bestId);
pending.erase(bestMatch);
if (bestId > maxId)
maxId = bestId;
}
}
if (candidates.isEmpty()) {
for (it = pending.begin(), ite = pending.end(); it != ite; ++it) {
it->trackingId = ++maxId;
newContacts.insert(it->trackingId, *it);
}
}
m_contacts = newContacts;
}
QRect QEvdevTouchScreenData::screenGeometry() const
{
if (m_forceToActiveWindow) {
QWindow *win = QGuiApplication::focusWindow();
return win ? QHighDpi::toNativePixels(win->geometry(), win) : QRect();
}
// Now it becomes tricky. Traditionally we picked the primaryScreen()
// and were done with it. But then, enter multiple screens, and
// suddenly it was all broken.
//
// For now we only support the display configuration of the KMS/DRM
// backends of eglfs. See QTouchOutputMapping.
//
// The good news it that once winRect refers to the correct screen
// geometry in the full virtual desktop space, there is nothing else
// left to do since qguiapp will handle the rest.
QScreen *screen = QGuiApplication::primaryScreen();
if (!m_screenName.isEmpty()) {
if (!m_screen) {
const QList<QScreen *> screens = QGuiApplication::screens();
for (QScreen *s : screens) {
if (s->name() == m_screenName) {
m_screen = s;
break;
}
}
}
if (m_screen)
screen = m_screen;
}
return QHighDpi::toNativePixels(screen->geometry(), screen);
}
void QEvdevTouchScreenData::reportPoints()
{
QRect winRect = screenGeometry();
if (winRect.isNull())
return;
const int hw_w = hw_range_x_max - hw_range_x_min;
const int hw_h = hw_range_y_max - hw_range_y_min;
// Map the coordinates based on the normalized position. QPA expects 'area'
// to be in screen coordinates.
const int pointCount = m_touchPoints.count();
for (int i = 0; i < pointCount; ++i) {
QWindowSystemInterface::TouchPoint &tp(m_touchPoints[i]);
// Generate a screen position that is always inside the active window
// or the primary screen. Even though we report this as a QRectF, internally
// Qt uses QRect/QPoint so we need to bound the size to winRect.size() - QSize(1, 1)
const qreal wx = winRect.left() + tp.normalPosition.x() * (winRect.width() - 1);
const qreal wy = winRect.top() + tp.normalPosition.y() * (winRect.height() - 1);
const qreal sizeRatio = (winRect.width() + winRect.height()) / qreal(hw_w + hw_h);
if (tp.area.width() == -1) // touch major was not provided
tp.area = QRectF(0, 0, 8, 8);
else
tp.area = QRectF(0, 0, tp.area.width() * sizeRatio, tp.area.height() * sizeRatio);
tp.area.moveCenter(QPointF(wx, wy));
// Calculate normalized pressure.
if (!hw_pressure_min && !hw_pressure_max)
tp.pressure = tp.state == Qt::TouchPointReleased ? 0 : 1;
else
tp.pressure = (tp.pressure - hw_pressure_min) / qreal(hw_pressure_max - hw_pressure_min);
}
// Let qguiapp pick the target window.
if (m_filtered)
emit q->touchPointsUpdated();
else
QWindowSystemInterface::handleTouchEvent(nullptr, q->touchDevice(), m_touchPoints);
}
QEvdevTouchScreenHandlerThread::QEvdevTouchScreenHandlerThread(const QString &device, const QString &spec, QObject *parent)
: QDaemonThread(parent), m_device(device), m_spec(spec), m_handler(nullptr), m_touchDeviceRegistered(false)
, m_touchUpdatePending(false)
, m_filterWindow(nullptr)
, m_touchRate(-1)
{
start();
}
QEvdevTouchScreenHandlerThread::~QEvdevTouchScreenHandlerThread()
{
quit();
wait();
}
void QEvdevTouchScreenHandlerThread::run()
{
m_handler = new QEvdevTouchScreenHandler(m_device, m_spec);
if (m_handler->isFiltered())
connect(m_handler, &QEvdevTouchScreenHandler::touchPointsUpdated, this, &QEvdevTouchScreenHandlerThread::scheduleTouchPointUpdate);
// Report the registration to the parent thread by invoking the method asynchronously
QMetaObject::invokeMethod(this, "notifyTouchDeviceRegistered", Qt::QueuedConnection);
exec();
delete m_handler;
m_handler = nullptr;
}
bool QEvdevTouchScreenHandlerThread::isTouchDeviceRegistered() const
{
return m_touchDeviceRegistered;
}
void QEvdevTouchScreenHandlerThread::notifyTouchDeviceRegistered()
{
m_touchDeviceRegistered = true;
emit touchDeviceRegistered();
}
void QEvdevTouchScreenHandlerThread::scheduleTouchPointUpdate()
{
QWindow *window = QGuiApplication::focusWindow();
if (window != m_filterWindow) {
if (m_filterWindow)
m_filterWindow->removeEventFilter(this);
m_filterWindow = window;
if (m_filterWindow)
m_filterWindow->installEventFilter(this);
}
if (m_filterWindow) {
m_touchUpdatePending = true;
m_filterWindow->requestUpdate();
}
}
bool QEvdevTouchScreenHandlerThread::eventFilter(QObject *object, QEvent *event)
{
if (m_touchUpdatePending && object == m_filterWindow && event->type() == QEvent::UpdateRequest) {
m_touchUpdatePending = false;
filterAndSendTouchPoints();
}
return false;
}
void QEvdevTouchScreenHandlerThread::filterAndSendTouchPoints()
{
QRect winRect = m_handler->d->screenGeometry();
if (winRect.isNull())
return;
float vsyncDelta = 1.0f / QGuiApplication::primaryScreen()->refreshRate();
QHash<int, FilteredTouchPoint> filteredPoints;
m_handler->d->m_mutex.lock();
double time = m_handler->d->m_timeStamp;
double lastTime = m_handler->d->m_lastTimeStamp;
double touchDelta = time - lastTime;
if (m_touchRate < 0 || touchDelta > vsyncDelta) {
// We're at the very start, with nothing to go on, so make a guess
// that the touch rate will be somewhere in the range of half a vsync.
// This doesn't have to be accurate as we will calibrate it over time,
// but it gives us a better starting point so calibration will be
// slightly quicker. If, on the other hand, we already have an
// estimate, we'll leave it as is and keep it.
if (m_touchRate < 0)
m_touchRate = (1.0 / QGuiApplication::primaryScreen()->refreshRate()) / 2.0;
} else {
// Update our estimate for the touch rate. We're making the assumption
// that this value will be mostly accurate with the occational bump,
// so we're weighting the existing value high compared to the update.
const double ratio = 0.9;
m_touchRate = sqrt(m_touchRate * m_touchRate * ratio + touchDelta * touchDelta * (1.0 - ratio));
}
QList<QWindowSystemInterface::TouchPoint> points = m_handler->d->m_touchPoints;
QList<QWindowSystemInterface::TouchPoint> lastPoints = m_handler->d->m_lastTouchPoints;
m_handler->d->m_mutex.unlock();
for (int i=0; i<points.size(); ++i) {
QWindowSystemInterface::TouchPoint &tp = points[i];
QPointF pos = tp.normalPosition;
FilteredTouchPoint f;
QWindowSystemInterface::TouchPoint ltp;
ltp.id = -1;
for (int j=0; j<lastPoints.size(); ++j) {
if (lastPoints.at(j).id == tp.id) {
ltp = lastPoints.at(j);
break;
}
}
QPointF velocity;
if (lastTime != 0 && ltp.id >= 0)
velocity = (pos - ltp.normalPosition) / m_touchRate;
if (m_filteredPoints.contains(tp.id)) {
f = m_filteredPoints.take(tp.id);
f.x.update(pos.x(), velocity.x(), vsyncDelta);
f.y.update(pos.y(), velocity.y(), vsyncDelta);
pos = QPointF(f.x.position(), f.y.position());
} else {
f.x.initialize(pos.x(), velocity.x());
f.y.initialize(pos.y(), velocity.y());
// Make sure the first instance of a touch point we send has the
// 'pressed' state.
if (tp.state != Qt::TouchPointPressed)
tp.state = Qt::TouchPointPressed;
}
tp.velocity = QVector2D(f.x.velocity() * winRect.width(), f.y.velocity() * winRect.height());
qreal filteredNormalizedX = f.x.position() + f.x.velocity() * m_handler->d->m_prediction / 1000.0;
qreal filteredNormalizedY = f.y.position() + f.y.velocity() * m_handler->d->m_prediction / 1000.0;
// Clamp to the screen
tp.normalPosition = QPointF(qBound<qreal>(0, filteredNormalizedX, 1),
qBound<qreal>(0, filteredNormalizedY, 1));
qreal x = winRect.x() + (tp.normalPosition.x() * (winRect.width() - 1));
qreal y = winRect.y() + (tp.normalPosition.y() * (winRect.height() - 1));
tp.area.moveCenter(QPointF(x, y));
// Store the touch point for later so we can release it if we've
// missed the actual release between our last update and this.
f.touchPoint = tp;
// Don't store the point for future reference if it is a release.
if (tp.state != Qt::TouchPointReleased)
filteredPoints[tp.id] = f;
}
for (QHash<int, FilteredTouchPoint>::const_iterator it = m_filteredPoints.constBegin(), end = m_filteredPoints.constEnd(); it != end; ++it) {
const FilteredTouchPoint &f = it.value();
QWindowSystemInterface::TouchPoint tp = f.touchPoint;
tp.state = Qt::TouchPointReleased;
tp.velocity = QVector2D();
points.append(tp);
}
m_filteredPoints = filteredPoints;
QWindowSystemInterface::handleTouchEvent(nullptr,
m_handler->touchDevice(),
points);
}
QT_END_NAMESPACE
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