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 <[email protected]>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gui/painting/qbackingstorerhisupport.cpp b/src/gui/painting/qbackingstorerhisupport.cpp
index 15fea26d16d..d811abf648e 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);