function inputMaskForOrientation(orientation) {
        // mask is in portrait window coordinates
        var mask = Qt.rect(0, 0, Screen.width, Screen.height)
        if (!window.opaqueBackground && webView.enabled && browserPage.active && !webView.touchBlocked && !downloadPopup.visible) {
            var overlayVisibleHeight = browserPage.height - overlay.y

            switch (orientation) {
            case Orientation.None:
            case Orientation.Landscape:
                mask.y = overlay.y
                // fallthrough
            case Orientation.LandscapeInverted:
                mask.height = overlayVisibleHeight
                break

            case Orientation.PortraitInverted:
                mask.x = overlay.y
                // fallthrough
            case Orientation.Portrait:
                mask.width = overlayVisibleHeight
            }
        }
        return mask
    }


function applyContentOrientation(orientation) {
            orientationFader.waitForWebContentOrientationChanged = (contentItem && contentItem.active)

            switch (orientation) {
            case Orientation.None:
            case Orientation.Portrait:
                updateContentOrientation(Qt.InvertedLandscapeOrientation)
                break
            case Orientation.Landscape:
                updateContentOrientation(Qt.PortraitOrientation)
                break
            case Orientation.PortraitInverted:
                updateContentOrientation(Qt.LandscapeOrientation)
                break
            case Orientation.LandscapeInverted:
                updateContentOrientation(Qt.InvertedPortraitOrientation)
                break
            }
        }