Cocoa: implement QScreen::orientation

Get the rotation value from the Core Graphics API, and map it to the
Qt::ScreenOrientation values.

Change-Id: I9bc9f37f34e00affee15e6ce0eace70d853eab0c
Reviewed-by: Doris Verria <doris.verria@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/plugins/platforms/cocoa/qcocoascreen.h

@@ -41,6 +41,7 @@ public:
     QWindow *topLevelAt(const QPoint &point) const override;
     QList<QPlatformScreen *> virtualSiblings() const override;
     QPlatformScreen::SubpixelAntialiasingType subpixelAntialiasingTypeHint() const override;
+    Qt::ScreenOrientation orientation() const override;
 
     // ----------------------------------------------------
 
@@ -90,6 +91,7 @@ private:
     QSizeF m_physicalSize;
     QCocoaCursor *m_cursor;
     qreal m_devicePixelRatio = 0;
+    qreal m_rotation = 0;
 
     CVDisplayLinkRef m_displayLink = nullptr;
     dispatch_source_t m_displayLinkSource = nullptr;

src/plugins/platforms/cocoa/qcocoascreen.mm

@@ -248,6 +248,7 @@ void QCocoaScreen::update(CGDirectDisplayID displayId)
     const QRect previousGeometry = m_geometry;
     const QRect previousAvailableGeometry = m_availableGeometry;
     const qreal previousRefreshRate = m_refreshRate;
+    const double previousRotation = m_rotation;
 
     // The reference screen for the geometry is always the primary screen
     QRectF primaryScreenGeometry = QRectF::fromCGRect(CGDisplayBounds(CGMainDisplayID()));
@@ -272,6 +273,7 @@ void QCocoaScreen::update(CGDirectDisplayID displayId)
     QCFType<CGDisplayModeRef> displayMode = CGDisplayCopyDisplayMode(m_displayId);
     float refresh = CGDisplayModeGetRefreshRate(displayMode);
     m_refreshRate = refresh > 0 ? refresh : 60.0;
+    m_rotation = CGDisplayRotation(displayId);
 
     if (@available(macOS 10.15, *))
         m_name = QString::fromNSString(nsScreen.localizedName);
@@ -280,6 +282,9 @@ void QCocoaScreen::update(CGDirectDisplayID displayId)
 
     const bool didChangeGeometry = m_geometry != previousGeometry || m_availableGeometry != previousAvailableGeometry;
 
+    if (m_rotation != previousRotation)
+        QWindowSystemInterface::handleScreenOrientationChange(screen(), orientation());
+
     if (didChangeGeometry)
         QWindowSystemInterface::handleScreenGeometryChange(screen(), geometry(), availableGeometry());
     if (m_refreshRate != previousRefreshRate)
@@ -522,6 +527,19 @@ QPlatformScreen::SubpixelAntialiasingType QCocoaScreen::subpixelAntialiasingType
     return type;
 }
 
+Qt::ScreenOrientation QCocoaScreen::orientation() const
+{
+    if (m_rotation == 0)
+        return Qt::LandscapeOrientation;
+    if (m_rotation == 90)
+        return Qt::PortraitOrientation;
+    if (m_rotation == 180)
+        return Qt::InvertedLandscapeOrientation;
+    if (m_rotation == 270)
+        return Qt::InvertedPortraitOrientation;
+    return QPlatformScreen::orientation();
+}
+
 QWindow *QCocoaScreen::topLevelAt(const QPoint &point) const
 {
     __block QWindow *window = nullptr;