alpha-channel? ( object -- ? )

Vocabulary

images

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the alpha-channel class.

Definition

USING: kernel ;

IN: images

: alpha-channel? ( object -- ? )
    dup INTENSITY?
    [ drop t ] [
        dup A?
        [ drop t ] [
            dup LA?
            [ drop t ] [
                dup ARGB?
                [ drop t ] [
                    dup ABGR?
                    [ drop t ]
                    [ dup RGBA? ~quotation~ ~quotation~ if ] if
                ] if
            ] if
        ] if
    ] if ;