1 files changed, 77 insertions, 0 deletions
diff --git a/src/gui/painting/qbackingstorerhisupport_p.h b/src/gui/painting/qbackingstorerhisupport_p.h
new file mode 100644
index 0000000000..39ce36c680
--- /dev/null
+++ b/src/gui/painting/qbackingstorerhisupport_p.h
@@ -0,0 +1,77 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QBACKINGSTORERHISUPPORT_P_H
+#define QBACKINGSTORERHISUPPORT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtGui/private/qtguiglobal_p.h>
+#include <QtGui/qwindow.h>
+#include <QtGui/qsurfaceformat.h>
+#include <QtGui/qoffscreensurface.h>
+#include <rhi/qrhi.h>
+#include <qpa/qplatformbackingstore.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_GUI_EXPORT QBackingStoreRhiSupport
+{
+public:
+    ~QBackingStoreRhiSupport();
+
+    void reset();
+
+    void setFormat(const QSurfaceFormat &format) { m_format = format; }
+    void setWindow(QWindow *window) { m_window = window; }
+    void setConfig(const QPlatformBackingStoreRhiConfig &config) { m_config = config; }
+
+    bool create();
+
+    QRhiSwapChain *swapChainForWindow(QWindow *window);
+
+    static QSurface::SurfaceType surfaceTypeForConfig(const QPlatformBackingStoreRhiConfig &config);
+
+    static bool checkForceRhi(QPlatformBackingStoreRhiConfig *outConfig, QSurface::SurfaceType *outType);
+
+    static QRhi::Implementation apiToRhiBackend(QPlatformBackingStoreRhiConfig::Api api);
+
+    QRhi *rhi() const { return m_rhi; }
+
+private:
+    QSurfaceFormat m_format;
+    QWindow *m_window = nullptr;
+    QPlatformBackingStoreRhiConfig m_config;
+    QRhi *m_rhi = nullptr;
+    QOffscreenSurface *m_openGLFallbackSurface = nullptr;
+    struct SwapchainData {
+        QRhiSwapChain *swapchain = nullptr;
+        QRhiRenderPassDescriptor *renderPassDescriptor = nullptr;
+        QObject *windowWatcher = nullptr;
+        void reset();
+    };
+    QHash<QWindow *, SwapchainData> m_swapchains;
+    friend class QBackingStoreRhiSupportWindowWatcher;
+};
+
+class QBackingStoreRhiSupportWindowWatcher : public QObject
+{
+public:
+    QBackingStoreRhiSupportWindowWatcher(QBackingStoreRhiSupport *rhiSupport) : m_rhiSupport(rhiSupport) { }
+    bool eventFilter(QObject *obj, QEvent *ev) override;
+private:
+    QBackingStoreRhiSupport *m_rhiSupport;
+};
+
+QT_END_NAMESPACE
+
+#endif // QBACKINGSTORERHISUPPORT_P_H