From cdae120f7f23fefcb4adbc34c6f082c60faa2952 Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.agocs@qt.io>
Date: Wed, 19 Jul 2023 11:24:37 +0200
Subject: [PATCH] Handle Null rhi backend in backingstore

Was missing for some reason when this got added in 6.4.

Pick-to: 6.6 6.5
Change-Id: I4f8b780c7119649688d8d8a197e8ef59730b0b61
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
---
 src/gui/painting/qbackingstorerhisupport.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/gui/painting/qbackingstorerhisupport.cpp b/src/gui/painting/qbackingstorerhisupport.cpp
index 15fea26d16..d811abf648 100644
--- a/src/gui/painting/qbackingstorerhisupport.cpp
+++ b/src/gui/painting/qbackingstorerhisupport.cpp
@@ -56,6 +56,11 @@ bool QBackingStoreRhiSupport::create()
     QOffscreenSurface *surface = nullptr;
     QRhi::Flags flags;
 
+    if (m_config.api() == QPlatformBackingStoreRhiConfig::Null) {
+        QRhiNullInitParams params;
+        rhi = QRhi::create(QRhi::Null, &params, flags);
+    }
+
 #if QT_CONFIG(opengl)
     if (!rhi && m_config.api() == QPlatformBackingStoreRhiConfig::OpenGL) {
         surface = QRhiGles2InitParams::newFallbackSurface(m_format);