Contents

startTask(toClear:)

Fills the entire destination with black or clear depending on its Alphamode.

Declaration

func startTask(toClear destination: CIRenderDestination) throws -> CIRenderTask

Parameters

Return Value

The asynchronous CIRenderTask for clearing the destination.

Discussion

If the destination’s alphaMode is CIRenderDestinationAlphaMode.none, this command fills the entire destination with black (0, 0, 0, 1).

If the destination’s alphaMode is CIRenderDestinationAlphaMode.premultiplied or CIRenderDestinationAlphaMode.unpremultiplied, this command fills the entire destination with clear (0, 0, 0, 0).

See Also

Customizing Render Destination