QmlDesigner: Improve usage of QML items as quick3d textures

Quick3D Texture elements require some window signals to show QML item
as texture, so we fake them to make textures appear in form editor
and state preview. To prevent texture mirroring, flipV value
is force set at proxy creation. To keep state preview up to date,
we trigger multiple render passes if there are any QML items used
as texture sources in quick3D textures.

Task-number: QDS-2290
Change-Id: I16c34aad943213c0b737fdb073333be3bbd40f2d
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

1 files changed, 15 insertions, 1 deletions

diff --git a/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp b/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp
index cfa1b1eac0..6e67d58b92 100644
--- a/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp
+++ b/share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quickitemnodeinstance.cpp
@@ -386,8 +386,14 @@ QImage QuickItemNodeInstance::renderImage() const
     static double devicePixelRatio = qgetenv("FORMEDITOR_DEVICE_PIXEL_RATIO").toDouble();
     size *= devicePixelRatio;
 
+    // Fake render loop signaling to update things like QML items as 3D textures
+    nodeInstanceServer()->quickView()->beforeSynchronizing();
+    nodeInstanceServer()->quickView()->beforeRendering();
+
     QImage renderImage = designerSupport()->renderImageForItem(quickItem(), renderBoundingRect, size);
 
+    nodeInstanceServer()->quickView()->afterRendering();
+
     renderImage.setDevicePixelRatio(devicePixelRatio);
 
     return renderImage;
@@ -401,7 +407,15 @@ QImage QuickItemNodeInstance::renderPreviewImage(const QSize &previewImageSize)
         static double devicePixelRatio = qgetenv("FORMEDITOR_DEVICE_PIXEL_RATIO").toDouble();
         const QSize size = previewImageSize * devicePixelRatio;
         if (quickItem()->isVisible()) {
-            return designerSupport()->renderImageForItem(quickItem(), previewItemBoundingRect, size);
+            // Fake render loop signaling to update things like QML items as 3D textures
+            nodeInstanceServer()->quickView()->beforeSynchronizing();
+            nodeInstanceServer()->quickView()->beforeRendering();
+
+            QImage image = designerSupport()->renderImageForItem(quickItem(), previewItemBoundingRect, size);
+
+            nodeInstanceServer()->quickView()->afterRendering();
+
+            return image;
         } else {
             QImage transparentImage(size, QImage::Format_ARGB32_Premultiplied);
             transparentImage.fill(Qt::transparent);