Add QWidgetPrivate::rhi() helper method

For accessing the RHI managed by the widget compositing machinery.

Pick-to: 6.7 6.6 6.5
Change-Id: Ia3c1227cc2d9cfebe95611cad3dbcd7aa6f6f8c7
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

3 files changed, 11 insertions, 8 deletions

diff --git a/src/widgets/kernel/qrhiwidget.cpp b/src/widgets/kernel/qrhiwidget.cpp
index ca2d6b51a9..bf56263113 100644
--- a/src/widgets/kernel/qrhiwidget.cpp
+++ b/src/widgets/kernel/qrhiwidget.cpp
@@ -475,14 +475,7 @@ void QRhiWidgetPrivate::releaseResources()
 void QRhiWidgetPrivate::ensureRhi()
 {
     Q_Q(QRhiWidget);
-    // the QRhi and infrastructure belongs to the top-level widget, not to this widget
-    QWidget *tlw = q->window();
-    QWidgetPrivate *wd = get(tlw);
-
-    QRhi *currentRhi = nullptr;
-    if (QWidgetRepaintManager *repaintManager = wd->maybeRepaintManager())
-        currentRhi = repaintManager->rhi();
-
+    QRhi *currentRhi = QWidgetPrivate::rhi();
     if (currentRhi && currentRhi->backend() != QBackingStoreRhiSupport::apiToRhiBackend(config.api())) {
         qWarning("The top-level window is already using another graphics API for composition, "
                  "'%s' is not compatible with this widget",
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 812c737633..81c6a6f7d8 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -1029,6 +1029,14 @@ void QWidgetPrivate::createRecursively()
     }
 }
 
+QRhi *QWidgetPrivate::rhi() const
+{
+    if (QWidgetRepaintManager *repaintManager = maybeRepaintManager())
+        return repaintManager->rhi();
+    else
+        return nullptr;
+}
+
 /*!
     \internal
     Returns the closest parent widget that has a QWindow window handle
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index 48461f8c74..b677a7eccb 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -221,6 +221,8 @@ public:
     void setSharedPainter(QPainter *painter);
     QWidgetRepaintManager *maybeRepaintManager() const;
 
+    QRhi *rhi() const;
+
     enum class WindowHandleMode {
         Direct,
         Closest,