GetSkiaScale

gistfile1.txt

        private float GetSkiaScale()
        {
            var presentationSource = PresentationSource.FromVisual(this);
            if (presentationSource == null) throw new Exception("PresentationSource is null");
            var compositionTarget = presentationSource.CompositionTarget;
            if (compositionTarget == null) throw new Exception("CompositionTarget is null");

            var m = compositionTarget.TransformToDevice;

            var dpiX = m.M11;
            var dpiY = m.M22;

            if (dpiX != dpiY)
                throw new ArgumentException();

            return (float)dpiX;
        }