1 files changed, 61 insertions, 0 deletions
diff --git a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp
index 1dec9ea..c1410a6 100644
--- a/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp
+++ b/src/plugins/gfxdrivers/powervr/pvreglscreen/pvreglscreen.cpp
@@ -271,6 +271,67 @@ int PvrEglScreen::transformation() const
 
 #endif
 
+#ifndef QT_NO_QWS_TRANSFORMED
+
+static const QScreen *parentScreen
+    (const QScreen *current, const QScreen *lookingFor)
+{
+    if (!current)
+        return 0;
+    switch (current->classId()) {
+    case QScreen::ProxyClass:
+    case QScreen::TransformedClass: {
+        const QScreen *child =
+            static_cast<const QProxyScreen *>(current)->screen();
+        if (child == lookingFor)
+            return current;
+        else
+            return parentScreen(child, lookingFor);
+    }
+    // Not reached.
+
+    case QScreen::MultiClass: {
+        QList<QScreen *> screens = current->subScreens();
+        foreach (QScreen *screen, screens) {
+            if (screen == lookingFor)
+                return current;
+            const QScreen *parent = parentScreen(screen, lookingFor);
+            if (parent)
+                return parent;
+        }
+    }
+    break;
+
+    default: break;
+    }
+    return 0;
+}
+
+int PvrEglScreen::transformation() const
+{
+    // We need to search for our parent screen, which is assumed to be
+    // "Transformed".  If it isn't, then there is no transformation.
+    // There is no direct method to get the parent screen so we need
+    // to search every screen until we find ourselves.
+    if (!parent && qt_screen != this)
+        parent = parentScreen(qt_screen, this);
+    if (!parent)
+        return 0;
+    if (parent->classId() != QScreen::TransformedClass)
+        return 0;
+    return 90 * static_cast<const QTransformedScreen *>(parent)
+                    ->transformation();
+}
+
+#else
+
+int PvrEglScreen::transformation() const
+{
+    return 0;
+}
+
+#endif
+
 void PvrEglScreen::sync()
 {
     // Put code here to synchronize 2D and 3D operations if necessary.