1 /* 2 * Copyright (c) 1981, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)overlay.c 8.2 (Berkeley) 05/04/94"; 10 #endif /* not lint */ 11 12 #include <ctype.h> 13 14 #include "curses.h" 15 16 /* 17 * overlay -- 18 * Writes win1 on win2 non-destructively. 19 */ 20 int 21 overlay(win1, win2) 22 register WINDOW *win1, *win2; 23 { 24 25 register int x, y, y1, y2, endy, endx, starty, startx; 26 register __LDATA *sp, *end; 27 28 #ifdef DEBUG 29 __CTRACE("overlay: (%0.2o, %0.2o);\n", win1, win2); 30 #endif 31 starty = max(win1->begy, win2->begy); 32 startx = max(win1->begx, win2->begx); 33 endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx); 34 endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx); 35 #ifdef DEBUG 36 __CTRACE("overlay: from (%d,%d) to (%d,%d)\n", 37 starty, startx, endy, endx); 38 #endif 39 if (starty >= endy || startx >= endx) 40 return (OK); 41 y1 = starty - win1->begy; 42 y2 = starty - win2->begy; 43 for (y = starty; y < endy; y++, y1++, y2++) { 44 end = &win1->lines[y1]->line[endx - win1->begx]; 45 x = startx - win2->begx; 46 for (sp = &win1->lines[y1]->line[startx - win1->begx]; 47 sp < end; sp++) { 48 if (!isspace(sp->ch)) { 49 wmove(win2, y2, x); 50 __waddch(win2, sp); 51 } 52 x++; 53 } 54 } 55 return (OK); 56 } 57