code: plan9front

ref: fe5d1976a0b4376c955ca8423eb9005f5d035403
dir: /sys/src/libmemdraw/alpha.hoc/

View raw version
func f(x) {
	return x-x%1
}

func pixel(dr, dg, db, da, sr, sg, sb, sa, m) {
	M = 255-f((sa*m)/255)
	print f((sr*m+dr*M)/255), " ", f((sg*m+dg*M)/255), " ", f((sb*m+db*M)/255),  " ", f((sa*m+da*M)/255), "\n"
	return 0
}