Contents

destinationIn

A mode that you use to erase any of the background that isn’t covered by opaque source pixels.

Declaration

static var destinationIn: GraphicsContext.BlendMode { get }

Discussion

This mode implements the equation R = D*Sa where

  • R is the composite image.

  • S is the source image.

  • Da is the source background’s alpha value.

See Also

Accessing Porter-Duff modes