blend

const (
	// ModeSourceOver is the default alpha blending mode.
	ModeSourceOver Mode = iota
	// ModeSourceCopy replaces the destination with the source.
	ModeSourceCopy
	// ModeDestinationOver draws destination over source.
	ModeDestinationOver
	// ModeDestinationIn keeps destination where source is opaque.
	ModeDestinationIn
	// ModeDestinationOut keeps destination where source is transparent.
	ModeDestinationOut
)