Add debug logging operator for QPlatformSurface

Change-Id: I2adecf87fa058bf973f4e4eed0a4c002f8359728
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

src/gui/kernel/qplatformsurface.cpp

@@ -38,6 +38,10 @@
 ****************************************************************************/
 
 #include "qplatformsurface.h"
+#ifndef QT_NO_DEBUG_STREAM
+#include <QtCore/qdebug.h>
+#include <QtGui/qwindow.h>
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -64,5 +68,26 @@ QPlatformSurface::QPlatformSurface(QSurface *surface) : m_surface(surface)
 {
 }
 
+#ifndef QT_NO_DEBUG_STREAM
+Q_GUI_EXPORT QDebug operator<<(QDebug debug, const QPlatformSurface *surface)
+{
+    QDebugStateSaver saver(debug);
+    debug.nospace();
+    debug << "QPlatformSurface(" << (const void *)surface;
+    if (surface) {
+        QSurface *s = surface->surface();
+        auto surfaceClass = s->surfaceClass();
+        debug << ", class=" << surfaceClass;
+        debug << ", type=" << s->surfaceType();
+        if (surfaceClass == QSurface::Window)
+            debug << ", window=" << static_cast<QWindow *>(s);
+        else
+            debug << ", surface=" << s;
+    }
+    debug << ')';
+    return debug;
+}
+#endif // !QT_NO_DEBUG_STREAM
+
 QT_END_NAMESPACE
 

src/gui/kernel/qplatformsurface.h

@@ -58,6 +58,10 @@ QT_BEGIN_NAMESPACE
 
 class QPlatformScreen;
 
+#ifndef QT_NO_DEBUG_STREAM
+class QDebug;
+#endif
+
 class Q_GUI_EXPORT QPlatformSurface
 {
 public:
@@ -76,6 +80,11 @@ private:
     friend class QPlatformOffscreenSurface;
 };
 
+
+#ifndef QT_NO_DEBUG_STREAM
+Q_GUI_EXPORT QDebug operator<<(QDebug debug, const QPlatformSurface *surface);
+#endif
+
 QT_END_NAMESPACE
 
 #endif //QPLATFORMSURFACE_H

src/gui/kernel/qsurface.h

@@ -55,11 +55,13 @@ class QSurfacePrivate;
 
 class Q_GUI_EXPORT QSurface
 {
+    Q_GADGET
 public:
     enum SurfaceClass {
         Window,
         Offscreen
     };
+    Q_ENUM(SurfaceClass)
 
     enum SurfaceType {
         RasterSurface,
@@ -69,6 +71,7 @@ public:
         VulkanSurface,
         MetalSurface
     };
+    Q_ENUM(SurfaceType)
 
     virtual ~QSurface();