diff -r 000000000000 -r 6474c204b198 widget/qt/nsScreenQt.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/qt/nsScreenQt.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,67 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <QColor>
+#include <QRect>
+#include <QGuiApplication>
+#include <QTransform>
+#include <QScreen>
+
+#include "nsScreenQt.h"
+#include "nsXULAppAPI.h"
+
+nsScreenQt::nsScreenQt(int aScreen)
+    : mScreen(aScreen)
+{
+    // nothing else to do. I guess we could cache a bunch of information
+    // here, but we want to ask the device at runtime in case anything
+    // has changed.
+}
+
+nsScreenQt::~nsScreenQt()
+{
+}
+
+NS_IMETHODIMP
+nsScreenQt::GetRect(int32_t *outLeft,int32_t *outTop,
+                    int32_t *outWidth,int32_t *outHeight)
+{
+    QRect r = QGuiApplication::screens()[mScreen]->geometry();
+
+    *outTop = r.x();
+    *outLeft = r.y();
+    *outWidth = r.width();
+    *outHeight = r.height();
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenQt::GetAvailRect(int32_t *outLeft,int32_t *outTop,
+                         int32_t *outWidth,int32_t *outHeight)
+{
+    QRect r = QGuiApplication::screens()[mScreen]->geometry();
+
+    *outTop = r.x();
+    *outLeft = r.y();
+    *outWidth = r.width();
+    *outHeight = r.height();
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenQt::GetPixelDepth(int32_t *aPixelDepth)
+{
+    // #############
+    *aPixelDepth = QGuiApplication::primaryScreen()->depth();
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsScreenQt::GetColorDepth(int32_t *aColorDepth)
+{
+    // ###############
+    return GetPixelDepth(aColorDepth);
+}