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Annotation of 43BSD/usr.lib/libcurses/overlay.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #ifndef lint
                      8: static char sccsid[] = "@(#)overlay.c  5.2 (Berkeley) 2/12/86";
                      9: #endif not lint
                     10: 
                     11: # include      "curses.ext"
                     12: # include      <ctype.h>
                     13: 
                     14: # define       min(a,b)        (a < b ? a : b)
                     15: # define       max(a,b)        (a > b ? a : b)
                     16: 
                     17: /*
                     18:  *     This routine writes win1 on win2 non-destructively.
                     19:  *
                     20:  */
                     21: overlay(win1, win2)
                     22: reg WINDOW     *win1, *win2; {
                     23: 
                     24:        reg char        *sp, *end;
                     25:        reg int         x, y, endy, endx, starty, startx;
                     26:        reg int         y1,y2;
                     27: 
                     28: # ifdef DEBUG
                     29:        fprintf(outf, "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:        fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
                     37: # endif
                     38:        if (starty >= endy || startx >= endx)
                     39:                return;
                     40:        x = endx - startx;
                     41:        for (y = starty; y < endy; y++) {
                     42:                bcopy(&win1->_y[y - win1->_begy][startx - win1->_begx],
                     43:                      &win2->_y[y - win2->_begy][startx - win2->_begx], x);
                     44:                touchline(win2, y, startx - win2->_begx, endx - win2->_begx);
                     45:        }
                     46:        y1 = starty - win1->_begy;
                     47:        y2 = starty - win2->_begy;
                     48:        for (y = starty; y < endy; y++, y1++, y2++) {
                     49:                end = &win1->_y[y1][endx - win1->_begx];
                     50:                x = startx - win2->_begx;
                     51:                for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
                     52:                        if (!isspace(*sp))
                     53:                                mvwaddch(win2, y2, x, *sp);
                     54:                        x++;
                     55:                }
                     56:        }
                     57: }

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