libinput: add support for LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE

This is required to get Qt EGLFS in qemu working, as qemu mouse
device issues only absolute mouse events.

Fixes: QTBUG-69172
Change-Id: Ia9985dc01d7871fdcd856c14160d54d3ce684396
Reviewed-by: Johan Helsing <johan.helsing@qt.io>

3 files changed, 22 insertions, 0 deletions

diff --git a/src/platformsupport/input/libinput/qlibinputhandler.cpp b/src/platformsupport/input/libinput/qlibinputhandler.cpp
index 52eaa18f4b..bb81890a67 100644
--- a/src/platformsupport/input/libinput/qlibinputhandler.cpp
+++ b/src/platformsupport/input/libinput/qlibinputhandler.cpp
@@ -205,6 +205,9 @@ void QLibInputHandler::processEvent(libinput_event *ev)
     case LIBINPUT_EVENT_POINTER_MOTION:
         m_pointer->processMotion(libinput_event_get_pointer_event(ev));
         break;
+    case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
+        m_pointer->processAbsMotion(libinput_event_get_pointer_event(ev));
+        break;
     case LIBINPUT_EVENT_POINTER_AXIS:
         m_pointer->processAxis(libinput_event_get_pointer_event(ev));
         break;
diff --git a/src/platformsupport/input/libinput/qlibinputpointer.cpp b/src/platformsupport/input/libinput/qlibinputpointer.cpp
index c54b61fc66..db9e81b5df 100644
--- a/src/platformsupport/input/libinput/qlibinputpointer.cpp
+++ b/src/platformsupport/input/libinput/qlibinputpointer.cpp
@@ -103,6 +103,24 @@ void QLibInputPointer::processMotion(libinput_event_pointer *e)
                                              Qt::NoButton, QEvent::MouseMove, mods);
 }
 
+void QLibInputPointer::processAbsMotion(libinput_event_pointer *e)
+{
+    QScreen * const primaryScreen = QGuiApplication::primaryScreen();
+    const QRect g = QHighDpi::toNativePixels(primaryScreen->virtualGeometry(), primaryScreen);
+
+    const double x = libinput_event_pointer_get_absolute_x_transformed(e, g.width());
+    const double y = libinput_event_pointer_get_absolute_y_transformed(e, g.height());
+
+    m_pos.setX(qBound(g.left(), qRound(g.left() + x), g.right()));
+    m_pos.setY(qBound(g.top(), qRound(g.top() + y), g.bottom()));
+
+    Qt::KeyboardModifiers mods = QGuiApplicationPrivate::inputDeviceManager()->keyboardModifiers();
+
+    QWindowSystemInterface::handleMouseEvent(nullptr, m_pos, m_pos, m_buttons,
+                                             Qt::NoButton, QEvent::MouseMove, mods);
+
+}
+
 void QLibInputPointer::processAxis(libinput_event_pointer *e)
 {
     double value; // default axis value is 15 degrees per wheel click
diff --git a/src/platformsupport/input/libinput/qlibinputpointer_p.h b/src/platformsupport/input/libinput/qlibinputpointer_p.h
index a7a66337f1..55d4a5f919 100644
--- a/src/platformsupport/input/libinput/qlibinputpointer_p.h
+++ b/src/platformsupport/input/libinput/qlibinputpointer_p.h
@@ -64,6 +64,7 @@ public:
 
     void processButton(libinput_event_pointer *e);
     void processMotion(libinput_event_pointer *e);
+    void processAbsMotion(libinput_event_pointer *e);
     void processAxis(libinput_event_pointer *e);
 
     void setPos(const QPoint &pos);