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/* $OpenBSD: lib_overlay.c,v 1.5 1998/01/17 16:27:35 millert Exp $ */
/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
/*
** lib_overlay.c
**
** The routines overlay(), copywin(), and overwrite().
**
*/
#include <curses.priv.h>
MODULE_ID("Id: lib_overlay.c,v 1.11 1997/12/19 17:04:06 xtang Exp $")
static int overlap(const WINDOW *const s, WINDOW *const d, int const flag)
{
int sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol;
T(("overlap : sby %d, sbx %d, smy %d, smx %d, dby %d, dbx %d, dmy %d, dmx %d",
s->_begy, s->_begx, s->_maxy, s->_maxx,
d->_begy, d->_begx, d->_maxy, d->_maxx));
if (!s || !d)
returnCode(ERR);
sminrow = max(s->_begy, d->_begy) - s->_begy;
smincol = max(s->_begx, d->_begx) - s->_begx;
dminrow = max(s->_begy, d->_begy) - d->_begy;
dmincol = max(s->_begx, d->_begx) - d->_begx;
dmaxrow = min(s->_maxy+s->_begy, d->_maxy+d->_begy) - d->_begy;
dmaxcol = min(s->_maxx+s->_begx, d->_maxx+d->_begx) - d->_begx;
return(copywin(s, d,
sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol,
flag));
}
/*
**
** overlay(win1, win2)
**
**
** overlay() writes the overlapping area of win1 behind win2
** on win2 non-destructively.
**
**/
int overlay(const WINDOW *win1, WINDOW *win2)
{
T((T_CALLED("overlay(%p,%p)"), win1, win2));
returnCode(overlap(win1, win2, TRUE));
}
/*
**
** overwrite(win1, win2)
**
**
** overwrite() writes the overlapping area of win1 behind win2
** on win2 destructively.
**
**/
int overwrite(const WINDOW *win1, WINDOW *win2)
{
T((T_CALLED("overwrite(%p,%p)"), win1, win2));
returnCode(overlap(win1, win2, FALSE));
}
int copywin(const WINDOW *src, WINDOW *dst,
int sminrow, int smincol,
int dminrow, int dmincol, int dmaxrow, int dmaxcol,
int over)
{
int sx, sy, dx, dy;
bool touched;
chtype bk = AttrOf(dst->_bkgd);
chtype mask = ~(chtype)((bk&A_COLOR) ? A_COLOR : 0);
T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"),
src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over));
if (!src || !dst)
returnCode(ERR);
/* make sure rectangle exists in source */
if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) ||
(smincol + dmaxcol - dmincol) > (src->_maxx + 1)) {
returnCode(ERR);
}
T(("rectangle exists in source"));
/* make sure rectangle fits in destination */
if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) {
returnCode(ERR);
}
T(("rectangle fits in destination"));
for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) {
touched = FALSE;
for(dx=dmincol, sx=smincol; dx <= dmaxcol; sx++, dx++)
{
if (over)
{
if ((TextOf(src->_line[sy].text[sx]) != ' ') &&
(dst->_line[dy].text[dx]!=src->_line[sy].text[sx]))
{
dst->_line[dy].text[dx] =
(src->_line[sy].text[sx] & mask) | bk;
touched = TRUE;
}
}
else {
if (dst->_line[dy].text[dx] != src->_line[sy].text[sx])
{
dst->_line[dy].text[dx] = src->_line[sy].text[sx];
touched = TRUE;
}
}
}
if (touched)
{
touchline(dst,0,getmaxy(dst));
}
}
T(("finished copywin"));
returnCode(OK);
}
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