Clay.Mask
class Mask a
data MaskComposite
clear
copy
sourceOver
sourceIn
sourceOut
sourceAtop
destinationOver
destinationIn
destinationOut
destinationAtop
xor
maskComposite
maskComposites
maskPosition
maskPositions
maskSize
maskSizes
maskRepeat
maskRepeats
maskOrigin
maskOrigins
maskClip
maskClips
maskAttachment
maskAttachments
maskImage
maskImages