REBOL [
	Title: "RGBA to integer conversion"
	Author: "Cyphre"
	type: 'graphic
	Purpose: "Demonstrate RGBA to integer conversions with rebcode."
]

rgba-to-int: rebcode [r g b a][
	lsl a 24
	lsl r 16
	lsl g 8
	or a r
	or a g
	or a b
	return a
]

draw-pix: rebcode [r g b a][
	apply a rgba-to-int [r g b a]
	poke img 1 a
]

update-pixel: does [
	draw-pix col/1 col/2 col/3 col/4
	;probe img
	show i
]

col: 0.0.0.0
img: make image! 1x1

view layout [
	backcolor black
	i: image img 100x100
	scroller 200x16 [
		col/1: to-integer face/data * 255
		update-pixel
	]
	scroller 200x16 [
		col/2: to-integer face/data * 255
		update-pixel
	]
	scroller 200x16 [
		col/3: to-integer face/data * 255
		update-pixel
	]
	scroller 200x16 [
		col/4: to-integer face/data * 255
		update-pixel
	]
]