"Johan Walles" <johan.walles@xxxxxxxxx> writes: > 2008/5/6 Michel Dänzer <michel@xxxxxxxxxxxxxxxxxxxx>: >> >> I think the standard technique for double buffering is to use a pixmap >> as the 'back buffer'. > > How would that help achieving flicker-free animation if it doesn't > wait for vertical retrace? As long as you don't imply "without tearing" when you say "flicker-free", it works perfectly. At least one way to use these words is that "flicker-free" only refers to the problem where you draw the content of a window by first drawing the background, then drawing something on top of it then maybe something else on top of that. The "flicker" refers to seeing an incompletely drawn image for a short while until all the drawing commands have completed. Obviously this sort of flicker is eliminated by drawing everything to an offscreen pixmap and only copying that pixmap to the window when it is completely drawn. However, that does not solve tearing problems nor judder problems. ("tearing" being that the window content is changed halfway through being drawn on screen, thus having the old content in the top half of the screen and the new content in the bottom half. "judder" would refer to the images being displayed on screen at the wrong time for any number of reasons. In this case, each frame by itself looks good, but smooth motions are not smooth anymore.) I'm sure other people use these words to mean different things, though :) eirik _______________________________________________ xorg mailing list xorg@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/xorg