Request correct alpha composition on the rhi code path

Task-number: QTBUG-78089
Change-Id: I22f8bb5ec0af33397df14e064a0306bd4c5a5ef5
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/manual/nodetypes_ng/nodetypes_ng.cpp b/tests/manual/nodetypes_ng/nodetypes_ng.cpp
index 829002b538..8fe0e0dc98 100644
--- a/tests/manual/nodetypes_ng/nodetypes_ng.cpp
+++ b/tests/manual/nodetypes_ng/nodetypes_ng.cpp
@@ -301,6 +301,13 @@ int main(int argc, char **argv)
         fmt.setProfile(QSurfaceFormat::CoreProfile);
         view.setFormat(fmt);
     }
+    if (app.arguments().contains(QLatin1String("--transparent"))) {
+        qDebug("Requesting alpha channel for the window and using Qt::transparent as background");
+        QSurfaceFormat fmt = view.format();
+        fmt.setAlphaBufferSize(8);
+        view.setFormat(fmt);
+        view.setColor(Qt::transparent);
+    }
 
     view.engine()->rootContext()->setContextProperty(QLatin1String("helper"), &helper);