/* create buffer to reduce flicker */
buffer = XCreatePixmap(dpy, window, sizex, sizey, xgwa.depth);
buffer_gc = XCreateGC(dpy, buffer, gcflags, &gcv);
+ XFillRectangle(dpy, buffer, buffer_gc, 0, 0, sizex, sizey);
/* blank out screen */
XFillRectangle(dpy, window, window_gc, 0, 0, sizex, sizey);