some helper functions, for retrieving information from the platform

abstraction

src/common/QskFunctions.cpp

@@ -4,6 +4,14 @@
 #include <qmath.h>
 #include <qscreen.h>
 
+QSK_QT_PRIVATE_BEGIN
+#include <private/qhighdpiscaling_p.h>
+#include <private/qguiapplication_p.h>
+QSK_QT_PRIVATE_END
+
+#include <qpa/qplatformintegration.h>
+#include <qpa/qplatformscreen.h>
+
 template< class Rect, class Value >
 static inline Rect qskAlignedRect( const Rect& outerRect,
     Value width, Value height, Qt::Alignment alignment )
@@ -138,3 +146,26 @@ qreal qskDpiScaled( qreal value )
 
     return value * factor;
 }
+
+qreal qskGlobalScaleFactor()
+{
+    // The value of QT_SCALE_FACTOR
+    const QScreen* noScreen = nullptr;
+    return QHighDpiScaling::factor( noScreen );
+}
+
+bool qskHasPlatformWindowManagement()
+{
+    if ( auto platform = QGuiApplicationPrivate::platformIntegration() )
+        return platform->hasCapability( QPlatformIntegration::WindowManagement );
+
+    return false;
+}
+
+QRect qskPlatformScreenGeometry( const QScreen* screen )
+{
+    if ( screen == nullptr )
+        return QRect();
+
+    return screen->handle()->geometry();
+}

src/common/QskFunctions.h

@@ -11,7 +11,12 @@
 #include <qmargins.h>
 #include <qrect.h>
 
+class QScreen;
+
 QSK_EXPORT qreal qskDpiScaled( qreal value );
+QSK_EXPORT qreal qskGlobalScaleFactor();
+QSK_EXPORT bool qskHasPlatformWindowManagement();
+QSK_EXPORT QRect qskPlatformScreenGeometry( const QScreen* );
 
 QSK_EXPORT QRect qskAlignedRect( const QRect& outerRect,
     int width, int height, Qt::Alignment alignment );