/* $XConsortium: DrHiDash.c /main/5 1995/07/15 20:50:42 drk $ */

/*

 * Motif

 *

 * Copyright (c) 1987-2012, The Open Group. All rights reserved.

 *

 * These libraries and programs are free software; you can

 * redistribute them and/or modify them under the terms of the GNU

 * Lesser General Public License as published by the Free Software

 * Foundation; either version 2 of the License, or (at your option)

 * any later version.

 *

 * These libraries and programs are distributed in the hope that

 * they will be useful, but WITHOUT ANY WARRANTY; without even the

 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR

 * PURPOSE. See the GNU Lesser General Public License for more

 * details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with these librararies and programs; if not, write

 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth

 * Floor, Boston, MA 02110-1301 USA

 * 

 */

/*

 * HISTORY

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include "XmI.h"

#include "DrawI.h"

/****************************_XmDrawHighlight***************************

 *

 * This function modifies the given gc, which therefore needs to be created

 *   using XCreateGC or XtAllocateGC.

 *

 ***************************************************************************/

void _XmDrawHighlight(Display *display, Drawable d, 

			  GC gc, 

#if NeedWidePrototypes

                          int x, int y, 

			  int width, int height,

			  int highlight_thickness,

#else

                          Position x, Position y, 

			  Dimension width, Dimension height,

			  Dimension highlight_thickness,

#endif /* NeedWidePrototypes */

                   int line_style)

{

   XSegment seg[4];

   register Dimension half_hl = highlight_thickness/2 ;

   register Dimension cor = highlight_thickness % 2 ;

   XGCValues gcvalues;

   if (!d || !highlight_thickness || !width || !height) return ;

   /* the XmList dash case relies on this particular order of X segments */

   seg[0].x1 = seg[2].x1 = x ;

   seg[0].y1 = seg[0].y2 = y + half_hl ;

   seg[0].x2 = x + width - highlight_thickness ;

   seg[1].x1 = seg[1].x2 = x + width - half_hl - cor;

   seg[1].y1 = seg[3].y1 = y ;

   seg[3].y2 = y + height - half_hl;

   seg[2].y1 = seg[2].y2 = y + height - half_hl - cor;

   seg[3].x1 = seg[3].x2 = x + half_hl ;

   seg[2].x2 = x + width ;

   seg[1].y2 = y + height ;

   /* first save the current values we want to change */

   XGetGCValues(display, gc,

		GCLineWidth|GCLineStyle|GCCapStyle|GCJoinStyle,

		&gcvalues);

   /* change them and draw the lines */

   XSetLineAttributes(display, gc,  highlight_thickness, line_style, 

		      CapButt, JoinMiter);

   XDrawSegments (display, d, gc, seg, 4);

   /* put them back */

   XSetLineAttributes(display, gc,  

		      gcvalues.line_width, gcvalues.line_style, 

		      gcvalues.cap_style, gcvalues.join_style);

   /** note that the above is a hack, a read-only GC shoudl not 

     be modified, period */

}