/**************************************************************************
 * OBJFLCHG.C - Change object options, with optional redraw.
 *************************************************************************/

#include "gemfintl.h"

#ifdef GEMFAST_PROTOS
  void obj_flchange(OBJECT *ptree, short object, short newflags,
					int drawflag, ...)
#else
  void obj_flchange(ptree, object, newflags, drawflag)
	register OBJECT *ptree;
	short			  object;
	short			  newflags;
	int 			  drawflag;
#endif
{
	GRECT			*optional_clip; /* present only if drawflag==OBJ_CLIPDRAW		   */
	GRECT			clip_rect;
	va_list 		args;

	va_start(args, drawflag);
	optional_clip = va_arg(args, GRECT *);
	va_end(args);

/*
 * check the newflags value. if the high bit is set, AND the newflags
 * with the current options, else OR them.
 */

	if (newflags & 0x8000) {
		ptree[object].ob_flags &= newflags;
	}
	else {
		ptree[object].ob_flags |= newflags;
	}

/*
 * if drawflag is true, we need to do a redraw starting at the changed
 * object's tree root (this is in case the HIDETREE flag is being changed),
 * but the redraw must be clipped by the object we're trying to update.
 * if the drawflag indicates a clipping rectangle was passed, the object's
 * rectangle is clipped to it.
 */

	if (drawflag) {
		obj_clcalc(ptree, object, &clip_rect, NULL);
		if (drawflag == OBJ_CLIPDRAW) {
			rc_intersect(optional_clip, &clip_rect);
		}
		objc_draw(ptree, R_TREE, MAX_DEPTH, RECTVALS(&clip_rect));
	}
}