Amiga Plus 2002 #11/Amiga Plus CD - 2002 - No. 11.iso/Tools/Development/ncurses-5.3/ncurses/base/lib_overlay.c

C/C++ Source or Header | 2002-10-27 | 5.8 KB | 185 lines

/****************************************************************************
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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <[e-mail]> 1992,1995               *
 *     and: Eric S. Raymond <[e-mail]>                         *
 ****************************************************************************/

/*
**    lib_overlay.c
**
**    The routines overlay(), copywin(), and overwrite().
**
*/

#include <curses.priv.h>

MODULE_ID("$Id: lib_overlay.c,v 1.21 2002/09/21 23:03:32 tom Exp $")

static int
overlap(const WINDOW *const s, WINDOW *const d, int const flag)
{
    int sx1, sy1, sx2, sy2;
    int dx1, dy1, dx2, dy2;
    int sminrow, smincol;
    int dminrow, dmincol;
    int dmaxrow, dmaxcol;

    T((T_CALLED("overlap(%p,%p,%d)"), s, d, flag));

    if (s == 0 || d == 0) {
    returnCode(ERR);
    } else {
    T(("src : begy %d, begx %d, maxy %d, maxx %d",
       s->_begy, s->_begx, s->_maxy, s->_maxx));
    T(("dst : begy %d, begx %d, maxy %d, maxx %d",
       d->_begy, d->_begx, d->_maxy, d->_maxx));

    sx1 = s->_begx;
    sy1 = s->_begy;
    sx2 = sx1 + s->_maxx;
    sy2 = sy1 + s->_maxy;

    dx1 = d->_begx;
    dy1 = d->_begy;
    dx2 = dx1 + d->_maxx;
    dy2 = dy1 + d->_maxy;

    if (dx2 < sx1 || dx1 > sx2 || dy2 < sy1 || dy1 > sy2) {
        returnCode(ERR);    /* No intersection */
    } else {
        sminrow = max(sy1, dy1) - sy1;
        smincol = max(sx1, dx1) - sx1;
        dminrow = max(sy1, dy1) - dy1;
        dmincol = max(sx1, dx1) - dx1;
        dmaxrow = min(sy2, dy2) - dy1;
        dmaxcol = min(sx2, dx2) - dx1;

        returnCode(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.
**
**/

NCURSES_EXPORT(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.
**
**/

NCURSES_EXPORT(int)
overwrite(const WINDOW *win1, WINDOW *win2)
{
    T((T_CALLED("overwrite(%p,%p)"), win1, win2));
    returnCode(overlap(win1, win2, FALSE));
}

NCURSES_EXPORT(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;
    attr_t bk = AttrOf(dst->_nc_bkgd);
    attr_t mask = ~(attr_t) ((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 ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
            (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx]))) {
            dst->_line[dy].text[dx] = src->_line[sy].text[sx];
            SetAttr(dst->_line[dy].text[dx],
                (AttrOf(src->_line[sy].text[sx]) & mask) | bk);
            touched = TRUE;
        }
        } else {
        if (!CharEq(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, dminrow, (dmaxrow - dminrow + 1));
    }
    }
    T(("finished copywin"));
    returnCode(OK);
}