Support QQuickWidget on Windows.

Task-number: QTBUG-36887

Change-Id: Ifb03804e21fd82d7eae2942b9e8ca83f1bdb776c
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

src/plugins/platforms/windows/qwindowsbackingstore.cpp

@@ -203,4 +203,17 @@ HDC QWindowsBackingStore::getDC() const
     return 0;
 }
 
+#ifndef QT_NO_OPENGL
+
+QImage QWindowsBackingStore::toImage() const
+{
+    if (m_image.isNull()) {
+        qCWarning(lcQpaBackingStore) <<__FUNCTION__ << "Image is null.";
+        return QImage();
+    }
+    return m_image.data()->image();
+}
+
+#endif // !QT_NO_OPENGL
+
 QT_END_NAMESPACE

src/plugins/platforms/windows/qwindowsbackingstore.h

@@ -67,6 +67,10 @@ public:
 
     HDC getDC() const;
 
+#ifndef QT_NO_OPENGL
+    QImage toImage() const Q_DECL_OVERRIDE;
+#endif
+
 private:
     QScopedPointer<QWindowsNativeImage> m_image;
 };

src/plugins/platforms/windows/qwindowsintegration.cpp

@@ -245,6 +245,8 @@ bool QWindowsIntegration::hasCapability(QPlatformIntegration::Capability cap) co
         return true;
     case ForeignWindows:
         return true;
+    case RasterGLSurface:
+        return true;
     default:
         return QPlatformIntegration::hasCapability(cap);
     }

src/plugins/platforms/windows/qwindowsnativeinterface.cpp

@@ -69,13 +69,18 @@ void *QWindowsNativeInterface::nativeResourceForWindow(const QByteArray &resourc
     QWindowsWindow *bw = static_cast<QWindowsWindow *>(window->handle());
     if (resource == "handle")
         return bw->handle();
-    if (window->surfaceType() == QWindow::RasterSurface) {
+    switch (window->surfaceType()) {
+    case QWindow::RasterSurface:
+    case QWindow::RasterGLSurface:
         if (resource == "getDC")
             return bw->getDC();
         if (resource == "releaseDC") {
             bw->releaseDC();
             return 0;
         }
+        break;
+    case QWindow::OpenGLSurface:
+        break;
     }
     qWarning("%s: Invalid key '%s' requested.", __FUNCTION__, resource.constData());
     return 0;