1 ! Copyright (C) 2003, 2009 Slava Pestov.
2 ! Copyright (C) 2008 Eduardo Cavazos.
3 ! See http://factorcode.org/license.txt for BSD license.
4 USING: accessors combinators kernel math ;
17 GENERIC: >rgba ( color -- rgba )
19 M: rgba >rgba ; inline
21 M: color red>> >rgba red>> ;
22 M: color green>> >rgba green>> ;
23 M: color blue>> >rgba blue>> ;
25 : >rgba-components ( object -- r g b a )
26 >rgba { [ red>> ] [ green>> ] [ blue>> ] [ alpha>> ] } cleave ; inline
28 : opaque? ( color -- ? ) alpha>> 1 number= ;
30 CONSTANT: transparent T{ rgba f 0.0 0.0 0.0 0.0 }
32 : inverse-color ( color -- color' )
33 >rgba-components [ [ 1.0 swap - ] tri@ ] dip <rgba> ;