Provide a native interface instance in minimal platform plugin

The minimal platform plugin does not have any native APIs it could offer
through that interface, but needs to provide an instance anyway. A lot
of code within Qt assumes that a native interface is always available
and does not check the pointer value, which leads to segfaults when used
with the minimal plugin.

Pick-to: 6.4 6.3 6.2 5.15
Change-Id: I625bd95afd49872cff3a34b29ceb0ffbbcd39db7
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

2 files changed, 13 insertions, 0 deletions

diff --git a/src/plugins/platforms/minimal/qminimalintegration.cpp b/src/plugins/platforms/minimal/qminimalintegration.cpp
index 7523a2d966..a145093872 100644
--- a/src/plugins/platforms/minimal/qminimalintegration.cpp
+++ b/src/plugins/platforms/minimal/qminimalintegration.cpp
@@ -6,6 +6,7 @@
 
 #include <QtGui/private/qpixmap_raster_p.h>
 #include <QtGui/private/qguiapplication_p.h>
+#include <qpa/qplatformnativeinterface.h>
 #include <qpa/qplatformwindow.h>
 #include <qpa/qwindowsysteminterface.h>
 
@@ -157,6 +158,13 @@ QAbstractEventDispatcher *QMinimalIntegration::createEventDispatcher() const
 #endif
 }
 
+QPlatformNativeInterface *QMinimalIntegration::nativeInterface() const
+{
+    if (!m_nativeInterface)
+        m_nativeInterface.reset(new QPlatformNativeInterface);
+    return m_nativeInterface.get();
+}
+
 QMinimalIntegration *QMinimalIntegration::instance()
 {
     return static_cast<QMinimalIntegration *>(QGuiApplicationPrivate::platformIntegration());
diff --git a/src/plugins/platforms/minimal/qminimalintegration.h b/src/plugins/platforms/minimal/qminimalintegration.h
index 914f26bf25..6070972b1b 100644
--- a/src/plugins/platforms/minimal/qminimalintegration.h
+++ b/src/plugins/platforms/minimal/qminimalintegration.h
@@ -7,6 +7,8 @@
 #include <qpa/qplatformintegration.h>
 #include <qpa/qplatformscreen.h>
 
+#include <qscopedpointer.h>
+
 QT_BEGIN_NAMESPACE
 
 class QMinimalScreen : public QPlatformScreen
@@ -46,12 +48,15 @@ public:
     QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const override;
     QAbstractEventDispatcher *createEventDispatcher() const override;
 
+    QPlatformNativeInterface *nativeInterface() const override;
+
     unsigned options() const { return m_options; }
 
     static QMinimalIntegration *instance();
 
 private:
     mutable QPlatformFontDatabase *m_fontDatabase;
+    mutable QScopedPointer<QPlatformNativeInterface> m_nativeInterface;
     QMinimalScreen *m_primaryScreen;
     unsigned m_options;
 };