Add XdgOutput client support

XdgOutput is an extension of wl_output with the benefit of having the
logical size of a screen as an explicit parameter, instead of clients
inferring it from modeSize / scale. This is useful as it allows
compositors to implement fractional scaling whilst clients can still
fill the screen.

In the future XdgOutputV2 will support a more useful name and ID that
we can use.

[ChangeLog][QPA plugin] Added support for xdg-output-unstable-v1

Change-Id: I2e1e64ad6cb497a1cbb7b7b170f28ac92231c2c4
Reviewed-by: Pier Luigi Fiorini <pierluigi.fiorini@liri.io>
Reviewed-by: Johan Helsing <johan.helsing@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/client/qwaylanddisplay.cpp b/src/client/qwaylanddisplay.cpp
index 03e4e3a2c..40ceafd96 100644
--- a/src/client/qwaylanddisplay.cpp
+++ b/src/client/qwaylanddisplay.cpp
@@ -276,6 +276,11 @@ void QWaylandDisplay::registry_global(uint32_t id, const QString &interface, uin
         // make a roundtrip here since we need to receive the events sent by
         // qt_hardware_integration before creating windows
         forceRoundTrip();
+    } else if (interface == QLatin1String("zxdg_output_manager_v1")) {
+        mXdgOutputManager.reset(new QtWayland::zxdg_output_manager_v1(registry, id, 1));
+        for (auto *screen : qAsConst(mScreens))
+            screen->initXdgOutput(xdgOutputManager());
+        forceRoundTrip();
     }
 
     mGlobals.append(RegistryGlobal(id, interface, version, registry));