===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/server-client.c,v
retrieving revision 1.387
retrieving revision 1.388
diff -c -r1.387 -r1.388
*** src/usr.bin/tmux/server-client.c	2021/09/27 19:12:00	1.387
--- src/usr.bin/tmux/server-client.c	2021/10/11 13:27:50	1.388
***************
*** 1,4 ****
! /* $OpenBSD: server-client.c,v 1.387 2021/09/27 19:12:00 nicm Exp $ */
  
  /*
   * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
--- 1,4 ----
! /* $OpenBSD: server-client.c,v 1.388 2021/10/11 13:27:50 nicm Exp $ */
  
  /*
   * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
***************
*** 145,150 ****
--- 145,198 ----
  
  	c->tty.flags &= ~(TTY_FREEZE|TTY_NOCURSOR);
  	server_redraw_client(c);
+ }
+ 
+ /*
+  * Given overlay position and dimensions, return parts of the input range which
+  * are visible.
+  */
+ void
+ server_client_overlay_range(u_int x, u_int y, u_int sx, u_int sy, u_int px,
+     u_int py, u_int nx, struct overlay_ranges *r)
+ {
+ 	u_int	ox, onx;
+ 
+ 	/* Return up to 2 ranges. */
+ 	r->px[2] = 0;
+ 	r->nx[2] = 0;
+ 
+ 	/* Trivial case of no overlap in the y direction. */
+ 	if (py < y || py > y + sy - 1) {
+ 		r->px[0] = px;
+ 		r->nx[0] = nx;
+ 		r->px[1] = 0;
+ 		r->nx[1] = 0;
+ 		return;
+ 	}
+ 
+ 	/* Visible bit to the left of the popup. */
+ 	if (px < x) {
+ 		r->px[0] = px;
+ 		r->nx[0] = x - px;
+ 		if (r->nx[0] > nx)
+ 			r->nx[0] = nx;
+ 	} else {
+ 		r->px[0] = 0;
+ 		r->nx[0] = 0;
+ 	}
+ 
+ 	/* Visible bit to the right of the popup. */
+ 	ox = x + sx;
+ 	if (px > ox)
+ 		ox = px;
+ 	onx = px + nx;
+ 	if (onx > ox) {
+ 		r->px[1] = ox;
+ 		r->nx[1] = onx - ox;
+ 	} else {
+ 		r->px[1] = 0;
+ 		r->nx[1] = 0;
+ 	}
  }
  
  /* Check if this client is inside this server. */