Contents

destinationOut

A mode that you use to erase any of the background that is covered by opaque source pixels.

Declaration

static var destinationOut: GraphicsContext.BlendMode { get }

Discussion

This mode implements the equation R = D*(1 - Sa) where

  • R is the composite image.

  • D is the background.

  • Sa is the source image’s alpha value.

See Also

Accessing Porter-Duff modes