Client: Add basic support for tablet-unstable-v2

[ChangeLog][QPA plugin] Added support for drawing tablets through the
tablet-unstable-v2 protocol.

Adds support for the basic one tablet, one tool, no pads scenario.

Besides the auto tests, I tested with a Huion Kamvas Pro 16 with a simple
pressure sensitive pen with two buttons. As far as I can tell, it works the
same way as on xcb on Sway and Gnome Shell.

Also tested on a Wacom PTZ-630 with a mouse, art pen, airbrush and a stylus.

Mapped the distance event to QTabletEvent::Z and slider to
QTabletEvent::tangentialPressure.

For now we send QTabletEvents even when there's a mouse or finger on the
tablet. Those should ideally be sent as QMouseEvents/QTouchEvents, but that's
out of scope for this patch, but at least we will send synthesized mouse events
if the tablet events are not accepted.

Change-Id: I93291ffa5f00fa2bb8533eddd8d873b84a3386b8
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/client/qwaylanddisplay.cpp b/src/client/qwaylanddisplay.cpp
index a8d19dc6..ffcc72ff 100644
--- a/src/client/qwaylanddisplay.cpp
+++ b/src/client/qwaylanddisplay.cpp
@@ -69,6 +69,7 @@
 #include "qwaylandextendedsurface_p.h"
 #include "qwaylandsubsurface_p.h"
 #include "qwaylandtouch_p.h"
+#include "qwaylandtabletv2_p.h"
 #include "qwaylandqtkey_p.h"
 
 #include <QtWaylandClient/private/qwayland-text-input-unstable-v2.h>
@@ -330,6 +331,8 @@ void QWaylandDisplay::registry_global(uint32_t id, const QString &interface, uin
         mTouchExtension.reset(new QWaylandTouchExtension(this, id));
     } else if (interface == QStringLiteral("zqt_key_v1")) {
         mQtKeyExtension.reset(new QWaylandQtKeyExtension(this, id));
+    } else if (interface == QStringLiteral("zwp_tablet_manager_v2")) {
+        mTabletManager.reset(new QWaylandTabletManagerV2(this, id, qMin(1, int(version))));
 #if QT_CONFIG(wayland_client_primary_selection)
     } else if (interface == QStringLiteral("zwp_primary_selection_device_manager_v1")) {
         mPrimarySelectionManager.reset(new QWaylandPrimarySelectionDeviceManagerV1(this, id, 1));