if (! use_xdamage) { return; }
void set_xdamage_mark(int x, int y, int w, int h) {	sraRegionPtr region;	mark_for_xdamage(x, y, w, h);	if (xdamage_scheduled_mark == 0.0) {		xdamage_scheduled_mark = dnow() + 2.0;	}	if (xdamage_scheduled_mark_region == NULL) {		xdamage_scheduled_mark_region = sraRgnCreate();	}	region = sraRgnCreateRect(x, y, x + w, y + w);	sraRgnOr(xdamage_scheduled_mark_region, region);	sraRgnDestroy(region);}