- color-a colorprocedure
- colour-a colorprocedure
- set! (color-a color) valsetter
- set! (colour-a color) valsetter
- color-a-set! color valsetter
- colour-a-set! color valsetter
Get or set the sdl2:color's "a" (alpha) field, as an integer in the range 0 to 255 (inclusive).