/*      $NetBSD: background.c,v 1.34 2024/12/23 02:58:03 blymn Exp $    */

/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Julian Coleman.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: background.c,v 1.34 2024/12/23 02:58:03 blymn Exp $");
#endif                          /* not lint */

#include <stdlib.h>
#include "curses.h"
#include "curses_private.h"

/*
* bkgdset
*      Set new background attributes on stdscr.
*/
void
bkgdset(chtype ch)
{
       wbkgdset(stdscr, ch);
}

/*
* bkgd --
*      Set new background attributes on stdscr and apply them to its
*      contents.
*/
int
bkgd(chtype ch)
{
       return(wbkgd(stdscr, ch));
}

/*
* wbkgdset
*      Set new background attributes on the specified window.
*/
void
wbkgdset(WINDOW *win, chtype ch)
{
       __CTRACE(__CTRACE_ATTR, "wbkgdset: (%p), '%s', %08x\n",
           win, unctrl(ch & __CHARTEXT), ch & __ATTRIBUTES);

       if (__predict_false(win == NULL))
               return;

       /* Background character. */
       if (ch & __CHARTEXT)
               win->bch = (wchar_t) ch & __CHARTEXT;

       /* Background attributes (check colour). */
       if (__using_color && !(ch & __COLOR))
               ch |= __default_color;
       win->battr = (attr_t) ch & __ATTRIBUTES;
}

/*
* wbkgd --
*      Set new background attributes on the specified window and
*      apply them to its contents.
*/
int
wbkgd(WINDOW *win, chtype ch)
{
       int y, x;

       __CTRACE(__CTRACE_ATTR, "wbkgd: (%p), '%s', %08x\n",
           win, unctrl(ch & __CHARTEXT), ch & __ATTRIBUTES);

       if (__predict_false(win == NULL))
               return ERR;

       wbkgdset(win, ch);

       for (y = 0; y < win->maxy; y++) {
               for (x = 0; x < win->maxx; x++) {
                       __LDATA *cp = &win->alines[y]->line[x];

                       /* Update/switch background characters */
                       if (cp->cflags & CA_BACKGROUND)
                               cp->ch = win->bch;

                       /* Update/merge attributes */
                       cp->attr = win->battr | (cp->attr & __ALTCHARSET);
#ifdef HAVE_WCHAR
                       cp->wcols = 1;
#endif
               }
       }
       __touchwin(win, 1);
       return OK;
}

/*
* getbkgd --
*      Get current background attributes.
*/
chtype
getbkgd(WINDOW *win)
{
       attr_t  battr;

       if (__predict_false(win == NULL))
               return ERR;

       /* Background attributes (check colour). */
       battr = win->battr & A_ATTRIBUTES;
       if (__using_color && ((battr & __COLOR) == __default_color))
               battr &= ~__COLOR;

       return ((chtype) ((win->bch & A_CHARTEXT) | battr));
}


#ifdef HAVE_WCHAR

void
bkgrndset(const cchar_t *wch)
{
       wbkgrndset(stdscr, wch);
}


int
bkgrnd(const cchar_t *wch)
{
       return wbkgrnd(stdscr, wch);
}


int
getbkgrnd(cchar_t *wch)
{
       return wgetbkgrnd(stdscr, wch);
}


void
wbkgrndset(WINDOW *win, const cchar_t *wch)
{
       attr_t battr;
       nschar_t *np, *tnp;
       int i, wy, wx;
       __LDATA obkgrnd, nbkgrnd;
       __LINE *wlp;

       __CTRACE(__CTRACE_ATTR, "wbkgrndset: (%p), '%s', %x\n",
           win, (const char *)wunctrl(wch), wch->attributes);

       if (__predict_false(win == NULL))
               return;

       /* ignore multi-column characters */
       if (!wch->elements || wcwidth(wch->vals[0]) > 1)
               return;

       /* get a copy of the old background, we will need it. */
       obkgrnd.ch = win->bch;
       obkgrnd.attr = win->battr;
       obkgrnd.cflags = CA_BACKGROUND;
       obkgrnd.wcols = win->wcols;
       obkgrnd.nsp = NULL;
       _cursesi_copy_nsp(win->bnsp, &obkgrnd);

       /* Background character. */
       tnp = np = win->bnsp;
       if (wcwidth( wch->vals[0]))
               win->bch = wch->vals[0];
       else {
               if (!np) {
                       np = malloc(sizeof(nschar_t));
                       if (!np)
                               return;
                       np->next = NULL;
                       win->bnsp = np;
               }
               np->ch = wch->vals[0];
               tnp = np;
               np = np->next;
       }
       /* add non-spacing characters */
       if (wch->elements > 1) {
               for (i = 1; i < wch->elements; i++) {
                       if ( !np ) {
                               np = malloc(sizeof(nschar_t));
                               if (!np)
                                       return;
                               np->next = NULL;
                               if (tnp)
                                       tnp->next = np;
                               else
                                       win->bnsp = np;
                       }
                       np->ch = wch->vals[i];
                       tnp = np;
                       np = np->next;
               }
       }
       /* clear the old non-spacing characters */
       __cursesi_free_nsp(np);

       /* Background attributes (check colour). */
       battr = wch->attributes & WA_ATTRIBUTES;
       if (__using_color && !( battr & __COLOR))
               battr |= __default_color;
       win->battr = battr;
       win->wcols = 1;

       nbkgrnd.ch = win->bch;
       nbkgrnd.attr = win->battr;
       nbkgrnd.cflags = CA_BACKGROUND;
       nbkgrnd.wcols = win->wcols;
       nbkgrnd.nsp = NULL;
       _cursesi_copy_nsp(win->bnsp, &nbkgrnd);

       /* if the background is already this char then skip updating */
       if (_cursesi_celleq(&obkgrnd, &nbkgrnd))
               return;

       /*
        * Now do the dirty work of updating all the locations
        * that have the old background character with the new.
        */

       for (wy = 0; wy < win->maxy; wy++) {
               wlp = win->alines[wy];
               for (wx = 0; wx < win->maxx; wx++) {
                       if (wlp->line[wx].cflags & CA_BACKGROUND) {
                               _cursesi_copy_wchar(&nbkgrnd, &wlp->line[wx]);
                       }
               }
       }
       __touchwin(win, 0);

}


int
wbkgrnd(WINDOW *win, const cchar_t *wch)
{
       __CTRACE(__CTRACE_ATTR, "wbkgrnd: (%p), '%s', %x\n",
           win, (const char *)wunctrl(wch), wch->attributes);

       if (__predict_false(win == NULL))
               return ERR;

       /* ignore multi-column characters */
       if (!wch->elements || wcwidth( wch->vals[ 0 ]) > 1)
               return ERR;

       wbkgrndset(win, wch);
       __touchwin(win, 1);
       return OK;
}


int
wgetbkgrnd(WINDOW *win, cchar_t *wch)
{
       nschar_t *np;

       if (__predict_false(win == NULL))
               return ERR;

       /* Background attributes (check colour). */
       wch->attributes = win->battr & WA_ATTRIBUTES;
       if (__using_color && ((wch->attributes & __COLOR) == __default_color))
               wch->attributes &= ~__COLOR;
       wch->vals[0] = win->bch;
       wch->elements = 1;
       np = win->bnsp;
       if (np) {
               while (np && wch->elements < CURSES_CCHAR_MAX) {
                       wch->vals[wch->elements++] = np->ch;
                       np = np->next;
               }
       }

       return OK;
}

#else  /* !HAVE_WCHAR */

void
bkgrndset(const cchar_t *wch)
{
       return;
}

int
bkgrnd(const cchar_t *wch)
{
       return ERR;
}


int
getbkgrnd(cchar_t *wch)
{
       return ERR;
}


void
wbkgrndset(WINDOW *win, const cchar_t *wch)
{
       return;
}


int
wbkgrnd(WINDOW *win, const cchar_t *wch)
{
       return ERR;
}


int
wgetbkgrnd(WINDOW *win, cchar_t *wch)
{
       return ERR;
}

#endif /* !HAVE_WCHAR */

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