BlackBerry: Fix the rotation of the viewfinder

This fixes the rotation of the viewfinder. We have to adjust the orientation
depending on the primary screen orientation. On a keyboard device, the viewfinder
would not rotate at all (same if auto orientation is turned off).

Task-number: QTBUG-37894
Change-Id: I2bf955fb3303ed236d3234154ded94fe78607455
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>
Reviewed-by: Bernd Weimer <bweimer@blackberry.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

src/plugins/qnx/camera/bbcameraorientationhandler.cpp

@@ -41,7 +41,8 @@
 #include "bbcameraorientationhandler.h"
 
 #include <QAbstractEventDispatcher>
-#include <QCoreApplication>
+#include <QGuiApplication>
+#include <QScreen>
 #include <QDebug>
 
 #include <bps/orientation.h>
@@ -87,6 +88,10 @@ bool BbCameraOrientationHandler::nativeEventFilter(const QByteArray&, void *mess
 
     const int angle = orientation_event_get_angle(event);
     if (angle != m_orientation) {
+#ifndef Q_OS_BLACKBERRY_TABLET
+        if (angle == 180) // The screen does not rotate at 180 degrees
+            return false;
+#endif
         m_orientation = angle;
         emit orientationChanged(m_orientation);
     }
@@ -94,6 +99,17 @@ bool BbCameraOrientationHandler::nativeEventFilter(const QByteArray&, void *mess
     return false; // do not drop the event
 }
 
+int BbCameraOrientationHandler::viewfinderOrientation() const
+{
+    // On a keyboard device we do not rotate the screen at all
+    if (qGuiApp->primaryScreen()->nativeOrientation()
+            != qGuiApp->primaryScreen()->primaryOrientation()) {
+        return m_orientation;
+    }
+
+    return 0;
+}
+
 int BbCameraOrientationHandler::orientation() const
 {
     return m_orientation;

src/plugins/qnx/camera/bbcameraorientationhandler.h

@@ -57,6 +57,8 @@ public:
 
     int orientation() const;
 
+    int viewfinderOrientation() const;
+
 Q_SIGNALS:
     void orientationChanged(int degree);
 

src/plugins/qnx/camera/bbcamerasession.cpp

@@ -772,11 +772,16 @@ void BbCameraSession::viewfinderFrameGrabbed(const QImage &image)
 {
     QTransform transform;
 
+    // subtract out the native rotation
     transform.rotate(m_nativeCameraOrientation);
 
+    // subtract out the current device orientation
+    if (m_device == cameraIdentifierRear())
+        transform.rotate(360 - m_orientationHandler->viewfinderOrientation());
+    else
+        transform.rotate(m_orientationHandler->viewfinderOrientation());
+
     QImage frame = image.copy().transformed(transform);
-    if (m_device == cameraIdentifierFront())
-        frame = frame.mirrored(true, false);
 
     QMutexLocker locker(&m_surfaceMutex);
     if (m_surface) {
@@ -896,7 +901,7 @@ bool BbCameraSession::startViewFinder()
         return false;
     }
 
-    const int angle = m_orientationHandler->orientation();
+    const int angle = m_orientationHandler->viewfinderOrientation();
 
     const QSize rotatedSize = ((angle == 0 || angle == 180) ? viewfinderResolution
                                                             : viewfinderResolution.transposed());