I would like to implent an highlighting feature in my engine. Like when your mouse is over an object in Baldur''s Gate, the contour of the object becomes highlighted. I figured two way of doing this: - First one, change my bitmap of the object to include a single pixel line, which is very close to the key color of the blit, around it. When I would blit the object, I would spread the the key color to include or not the highlight line. - Second one, do it all with a draw line function. Which seems to me pretty slow and hard to implent. So which one is the faster ? And fell free to tell me your ideas on this and give other ways of doing it.