diff options
Diffstat (limited to 'lib/libcurses/overlay.c')
| -rw-r--r-- | lib/libcurses/overlay.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/lib/libcurses/overlay.c b/lib/libcurses/overlay.c new file mode 100644 index 000000000000..d272c7ba6daf --- /dev/null +++ b/lib/libcurses/overlay.c @@ -0,0 +1,77 @@ +/* + * Copyright (c) 1981 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)overlay.c 5.6 (Berkeley) 6/1/90"; +#endif /* not lint */ + +# include "curses.ext" + +# define min(a,b) (a < b ? a : b) +# define max(a,b) (a > b ? a : b) + +/* + * This routine writes win1 on win2 non-destructively. + * + */ +overlay(win1, win2) +reg WINDOW *win1, *win2; { + + reg chtype *sp, *end; + reg int x, y, endy, endx, starty, startx; + reg int y1,y2; + +# ifdef DEBUG + fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2); +# endif + starty = max(win1->_begy, win2->_begy); + startx = max(win1->_begx, win2->_begx); + endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begx); + endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx); +# ifdef DEBUG + fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx); +# endif + if (starty >= endy || startx >= endx) + return; + y1 = starty - win1->_begy; + y2 = starty - win2->_begy; + for (y = starty; y < endy; y++, y1++, y2++) { + end = &win1->_y[y1][endx - win1->_begx]; + x = startx - win2->_begx; + for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) { + if (*sp != ' ') + mvwaddch(win2, y2, x, *sp); + x++; + } + } +} |