'Declaration
 
Public Overrides Sub PushTransparencyLayer( _
   ByVal contentBounds As System.Nullable(Of RectangleF), _
   ByVal opacity As System.Single _
) 

public override void PushTransparencyLayer( 
   System.Nullable<RectangleF> contentBounds,
   System.float opacity
)

Parameters

contentBounds

The content bounds of the transparency layer. Content won't render outside these bounds. When set to a null reference (Nothing in Visual Basic), the content bounds are effectively taken to be the bounds of the current GcWicBitmapGraphics.

opacity

An opacity value that is applied uniformly to all drawings in the layer when compositing to the backplate.

Reference

GcWicBitmapGraphics Class
GcWicBitmapGraphics Members