QmlDesigner: Implement different render path for Qt 6

When building with Qt 6 or if qmlpuppet_unifiedRenderPath is set
in the environment we switch to a different render path.
In this case we use QQuickWindow::grabWindow() and render the root item.
No composition is done in the Qt Creator process anymore.
This is a similar approach we already take for the 3D view.
Performance is acceptable and we fix rendering issues related to
effects and layers.

Change-Id: Ic963eca047e0bf16ca3a099ec94658ae2af0fb63
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>

1 files changed, 19 insertions, 4 deletions

diff --git a/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5rendernodeinstanceserver.cpp b/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5rendernodeinstanceserver.cpp
index 08b20ccd22..fd3446f396 100644
--- a/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5rendernodeinstanceserver.cpp
+++ b/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5rendernodeinstanceserver.cpp
@@ -87,17 +87,27 @@ void Qt5RenderNodeInstanceServer::collectItemChangesAndSendChangeCommands()
                         if (ancestorInstance.isValid())
                             m_dirtyInstanceSet.insert(ancestorInstance);
                     }
-                    DesignerSupport::updateDirtyNode(item);
+                    Internal::QuickItemNodeInstance::updateDirtyNode(item);
                 }
             }
 
             clearChangedPropertyList();
 
-            if (!m_dirtyInstanceSet.isEmpty()) {
-                nodeInstanceClient()->pixmapChanged(createPixmapChangedCommand(QtHelpers::toList(m_dirtyInstanceSet)));
-                m_dirtyInstanceSet.clear();
+            if (Internal::QuickItemNodeInstance::unifiedRenderPath()) {
+                /* QQuickItem::grabToImage render path */
+                /* TODO implement QQuickItem::grabToImage based rendering */
+                /* sheduleRootItemRender(); */
+                nodeInstanceClient()->pixmapChanged(createPixmapChangedCommand({rootNodeInstance()}));
+            } else {
+                if (!m_dirtyInstanceSet.isEmpty()) {
+                    nodeInstanceClient()->pixmapChanged(
+                        createPixmapChangedCommand(QtHelpers::toList(m_dirtyInstanceSet)));
+                    m_dirtyInstanceSet.clear();
+                }
             }
 
+            m_dirtyInstanceSet.clear();
+
             resetAllItems();
 
             slowDownRenderTimer();
@@ -137,6 +147,11 @@ void Qt5RenderNodeInstanceServer::createScene(const CreateSceneCommand &command)
     }
 
     nodeInstanceClient()->pixmapChanged(createPixmapChangedCommand(instanceList));
+
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+#else
+    quickView()->show();
+#endif
 }
 
 void Qt5RenderNodeInstanceServer::clearScene(const ClearSceneCommand &command)