AttachedCardShadow with non-Uniform CornerRadius?

[hawkerm]

Not sure if this is a technical limitation or an implementation limitation, but I noticed that CornerRadius is only a double value on AttachedCardShadow and not a Thickness, so if you have an element with a non-uniform CornerRadius, say 32,8,8,32 where it's rounded on the left more than it is on the right... then you can't get a matching performant shadow.

@Ryken100 any thoughts here?

[Ryken100]

AttachedCardShadow uses CanvasGeometry.CreateRoundedRectangle() and Compositor.CreateRoundedRectangleGeometry() to create the geometry of its inner clip, both of which only support uniform corner radius.

There's no technical limitation, just that using the existing rounded rectangle methods is simpler mathematically. We should be able to achieve non-uniform roundedness using paths via CanvasGeometry.CreatePath() and Compositor.CreatePathGeometry().

There may be a performance penalty when using Compositor.CreatePathGeometry() compared to using Compositor.CreateRoundedRectangleGeometry() though. When the element changes size, with CreateRoundedRectangleGeometry we can just change the size of the existing geometry to match. With CreatePathGeometry, we'll need to create new geometry every time the element changes size.