From 71871c46ed29c7923b85090ddbe6366027c61f2d Mon Sep 17 00:00:00 2001
From: Bernd Weimer <bernd.weimer@qt.io>
Date: Tue, 12 Jul 2022 15:03:01 +0200
Subject: Avoid rendering fully transparent node

This improves performance in single-process mode, when an
ApplicationManagerWindow is fully transparent.

Change-Id: I87d35a76c4301b59b513bf19b4de01fb244e028e
Reviewed-by: Robert Griebl <robert.griebl@qt.io>
(cherry picked from commit 1b818ba23087fc57a4392a26f72861c9364d0ba8)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/manager-lib/inprocesssurfaceitem.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/manager-lib/inprocesssurfaceitem.cpp b/src/manager-lib/inprocesssurfaceitem.cpp
index 07bcb6ed..3704b2d2 100644
--- a/src/manager-lib/inprocesssurfaceitem.cpp
+++ b/src/manager-lib/inprocesssurfaceitem.cpp
@@ -138,6 +138,9 @@ bool InProcessSurfaceItem::visibleClientSide() const
 
 QSGNode *InProcessSurfaceItem::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
 {
+    if (m_color.alpha() == 0)
+        return oldNode;  // no need to render fully transparent node
+
     QSGSimpleRectNode *node = static_cast<QSGSimpleRectNode *>(oldNode);
     if (!node) {
         node = new QSGSimpleRectNode(clipRect(), m_color);
-- 
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