colors: adding inverse-color.

2012-10-21 13:16:34 -07:00 · 2012-10-21 13:16:34 -07:00 · 1d9a0f40fc
parent 0d4f08d7fd
commit 1d9a0f40fc
1 changed files with 3 additions and 0 deletions
--- a/basis/colors/colors.factor
+++ b/basis/colors/colors.factor
@ -33,3 +33,6 @@ CONSTANT: transparent T{ rgba f 0.0 0.0 0.0 0.0 }
    color1 >rgba-components drop [ 1.0 percent - * ] tri@
    color2 >rgba-components drop [ percent * ] tri@
    [ + ] tri-curry@ tri* 1.0 <rgba> ;
+
+: inverse-color ( color -- color' )
+    >rgba-components [ [ 1.0 swap - ] tri@ ] dip <rgba> ;