[wayland] Add support for pointer warping in InputRedirectionCursor

With libinput we do can support warping pointers, let's do it.

cursor.cpp

@@ -536,8 +536,11 @@ InputRedirectionCursor::~InputRedirectionCursor()
 
 void InputRedirectionCursor::doSetPos()
 {
-    // no support for pointer warping - reset to true position
+    if (input()->supportsPointerWarping()) {
+        input()->warpPointer(currentPos());
+    }
     slotPosChanged(input()->globalPointer());
+    emit posChanged(currentPos());
 }
 
 void InputRedirectionCursor::slotPosChanged(const QPointF &pos)

input.cpp

@@ -286,6 +286,7 @@ void InputRedirection::setupLibInput()
     m_libInput = conn;
     if (conn) {
         conn->setup();
+        m_pointerWarping = true;
         connect(conn, &LibInput::Connection::pointerButtonChanged, this, &InputRedirection::processPointerButton);
         connect(conn, &LibInput::Connection::pointerAxisChanged, this, &InputRedirection::processPointerAxis);
         connect(conn, &LibInput::Connection::keyChanged, this, &InputRedirection::processKeyboardKey);
@@ -1046,4 +1047,11 @@ void InputRedirection::updatePointerAfterScreenChange()
     emit globalPointerChanged(m_globalPointer);
 }
 
+void InputRedirection::warpPointer(const QPointF &pos)
+{
+    if (m_pointerWarping) {
+        updatePointerPosition(pos);
+    }
+}
+
 } // namespace

input.h

@@ -139,6 +139,9 @@ public:
     void cancelTouch();
     void touchFrame();
 
+    bool supportsPointerWarping() const;
+    void warpPointer(const QPointF &pos);
+
     static uint8_t toXPointerButton(uint32_t button);
     static uint8_t toXPointerButton(PointerAxis axis, qreal delta);
 
@@ -219,6 +222,8 @@ private:
 
     LibInput::Connection *m_libInput = nullptr;
 
+    bool m_pointerWarping = false;
+
     KWIN_SINGLETON(InputRedirection)
     friend InputRedirection *input();
 };
@@ -282,6 +287,12 @@ void InputRedirection::registerShortcut(const QKeySequence &shortcut, QAction *a
     connect(action, &QAction::triggered, receiver, slot);
 }
 
+inline
+bool InputRedirection::supportsPointerWarping() const
+{
+    return m_pointerWarping;
+}
+
 #if HAVE_XKB
 inline
 Qt::KeyboardModifiers Xkb::modifiers() const

kcmkwin/kwinrules/kwinsrc.cpp

@@ -38,3 +38,7 @@ Qt::KeyboardModifiers KWin::InputRedirection::keyboardModifiers() const
 {
     return Qt::NoModifier;
 }
+
+void KWin::InputRedirection::warpPointer(const QPointF&)
+{
+}