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background.c revision 1.25 
      1 /*	$NetBSD: background.c,v 1.25 2018/11/19 20:37:04 uwe Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Julian Coleman.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __RCSID("$NetBSD: background.c,v 1.25 2018/11/19 20:37:04 uwe Exp $");
     35 #endif				/* not lint */
     36 
     37 #include <stdlib.h>
     38 #include "curses.h"
     39 #include "curses_private.h"
     40 
     41 /*
     42  * bkgdset
     43  *	Set new background attributes on stdscr.
     44  */
     45 void
     46 bkgdset(chtype ch)
     47 {
     48 	wbkgdset(stdscr, ch);
     49 }
     50 
     51 /*
     52  * bkgd --
     53  *	Set new background attributes on stdscr and apply them to its
     54  *	contents.
     55  */
     56 int
     57 bkgd(chtype ch)
     58 {
     59 	return(wbkgd(stdscr, ch));
     60 }
     61 
     62 /*
     63  * wbkgdset
     64  *	Set new background attributes on the specified window.
     65  */
     66 void
     67 wbkgdset(WINDOW *win, chtype ch)
     68 {
     69 #ifdef DEBUG
     70 	__CTRACE(__CTRACE_ATTR, "wbkgdset: (%p), '%s', %08x\n",
     71 	    win, unctrl(ch & __CHARTEXT), ch & __ATTRIBUTES);
     72 #endif
     73 
     74 	/* Background character. */
     75 	if (ch & __CHARTEXT)
     76 		win->bch = (wchar_t) ch & __CHARTEXT;
     77 
     78 	/* Background attributes (check colour). */
     79 	if (__using_color && !(ch & __COLOR))
     80 		ch |= __default_color;
     81 	win->battr = (attr_t) ch & __ATTRIBUTES;
     82 }
     83 
     84 /*
     85  * wbkgd --
     86  *	Set new background attributes on the specified window and
     87  *	apply them to its contents.
     88  */
     89 int
     90 wbkgd(WINDOW *win, chtype ch)
     91 {
     92 	chtype obch;
     93 	int y, x;
     94 
     95 #ifdef DEBUG
     96 	__CTRACE(__CTRACE_ATTR, "wbkgd: (%p), '%s', %08x\n",
     97 	    win, unctrl(ch & __CHARTEXT), ch & __ATTRIBUTES);
     98 #endif
     99 	obch = win->bch;
    100 	wbkgdset(win, ch);
    101 
    102 	for (y = 0; y < win->maxy; y++) {
    103 		for (x = 0; x < win->maxx; x++) {
    104 			__LDATA *cp = &win->alines[y]->line[x];
    105 
    106 			/* Update/switch background characters */
    107 			if (cp->ch == obch)
    108 				cp->ch = win->bch;
    109 
    110 			/* Update/merge attributes */
    111 			cp->attr = win->battr | (cp->attr & __ALTCHARSET);
    112 #ifdef HAVE_WCHAR
    113 			SET_WCOL(*cp, 1);
    114 #endif
    115 		}
    116 	}
    117 	__touchwin(win);
    118 	return OK;
    119 }
    120 
    121 /*
    122  * getbkgd --
    123  *	Get current background attributes.
    124  */
    125 chtype
    126 getbkgd(WINDOW *win)
    127 {
    128 	attr_t	battr;
    129 
    130 	/* Background attributes (check colour). */
    131 	battr = win->battr & A_ATTRIBUTES;
    132 	if (__using_color && ((battr & __COLOR) == __default_color))
    133 		battr &= ~__COLOR;
    134 
    135 	return ((chtype) ((win->bch & A_CHARTEXT) | battr));
    136 }
    137 
    138 
    139 #ifdef HAVE_WCHAR
    140 
    141 void
    142 bkgrndset(const cchar_t *wch)
    143 {
    144 	wbkgrndset(stdscr, wch);
    145 }
    146 
    147 
    148 int
    149 bkgrnd(const cchar_t *wch)
    150 {
    151 	return wbkgrnd(stdscr, wch);
    152 }
    153 
    154 
    155 int
    156 getbkgrnd(cchar_t *wch)
    157 {
    158 	return wgetbkgrnd(stdscr, wch);
    159 }
    160 
    161 
    162 void
    163 wbkgrndset(WINDOW *win, const cchar_t *wch)
    164 {
    165 	attr_t battr;
    166 	nschar_t *np, *tnp;
    167 	int i;
    168 
    169 #ifdef DEBUG
    170 	__CTRACE(__CTRACE_ATTR, "wbkgrndset: (%p), '%s', %x\n",
    171 		win, (const char *) wunctrl(wch), wch->attributes);
    172 #endif
    173 
    174 	/* ignore multi-column characters */
    175 	if (!wch->elements || wcwidth(wch->vals[0]) > 1)
    176 		return;
    177 
    178 	/* Background character. */
    179 	tnp = np = win->bnsp;
    180 	if (wcwidth( wch->vals[0]))
    181 		win->bch = wch->vals[0];
    182 	else {
    183 		if (!np) {
    184 			np = malloc(sizeof(nschar_t));
    185 			if (!np)
    186 				return;
    187 			np->next = NULL;
    188 			win->bnsp = np;
    189 		}
    190 		np->ch = wch->vals[0];
    191 		tnp = np;
    192 		np = np->next;
    193 	}
    194 	/* add non-spacing characters */
    195 	if (wch->elements > 1) {
    196 		for (i = 1; i < wch->elements; i++) {
    197 			if ( !np ) {
    198 				np = malloc(sizeof(nschar_t));
    199 				if (!np)
    200 					return;
    201 				np->next = NULL;
    202 				if (tnp)
    203 					tnp->next = np;
    204 				else
    205 					win->bnsp = np;
    206 			}
    207 			np->ch = wch->vals[i];
    208 			tnp = np;
    209 			np = np->next;
    210 		}
    211 	}
    212 	/* clear the old non-spacing characters */
    213 	while (np) {
    214 		tnp = np->next;
    215 		free(np);
    216 		np = tnp;
    217 	}
    218 
    219 	/* Background attributes (check colour). */
    220 	battr = wch->attributes & WA_ATTRIBUTES;
    221 	if (__using_color && !( battr & __COLOR))
    222 		battr |= __default_color;
    223 	win->battr = battr;
    224 	SET_BGWCOL((*win), 1);
    225 }
    226 
    227 
    228 int
    229 wbkgrnd(WINDOW *win, const cchar_t *wch)
    230 {
    231 #ifdef DEBUG
    232 	__CTRACE(__CTRACE_ATTR, "wbkgrnd: (%p), '%s', %x\n",
    233 		win, (const char *) wunctrl(wch), wch->attributes);
    234 #endif
    235 
    236 	/* ignore multi-column characters */
    237 	if (!wch->elements || wcwidth( wch->vals[ 0 ]) > 1)
    238 		return ERR;
    239 
    240 	wbkgrndset(win, wch);
    241 	__touchwin(win);
    242 	return OK;
    243 }
    244 
    245 
    246 int
    247 wgetbkgrnd(WINDOW *win, cchar_t *wch)
    248 {
    249 	nschar_t *np;
    250 
    251 	/* Background attributes (check colour). */
    252 	wch->attributes = win->battr & WA_ATTRIBUTES;
    253 	if (__using_color && ((wch->attributes & __COLOR) == __default_color))
    254 		wch->attributes &= ~__COLOR;
    255 	wch->vals[0] = win->bch;
    256 	wch->elements = 1;
    257 	np = win->bnsp;
    258 	if (np) {
    259 		while (np && wch->elements < CURSES_CCHAR_MAX) {
    260 			wch->vals[wch->elements++] = np->ch;
    261 			np = np->next;
    262 		}
    263 	}
    264 
    265 	return OK;
    266 }
    267 
    268 #else  /* !HAVE_WCHAR */
    269 
    270 void
    271 bkgrndset(const cchar_t *wch)
    272 {
    273 	return;
    274 }
    275 
    276 int
    277 bkgrnd(const cchar_t *wch)
    278 {
    279 	return ERR;
    280 }
    281 
    282 
    283 int
    284 getbkgrnd(cchar_t *wch)
    285 {
    286 	return ERR;
    287 }
    288 
    289 
    290 void
    291 wbkgrndset(WINDOW *win, const cchar_t *wch)
    292 {
    293 	return;
    294 }
    295 
    296 
    297 int
    298 wbkgrnd(WINDOW *win, const cchar_t *wch)
    299 {
    300 	return ERR;
    301 }
    302 
    303 
    304 int
    305 wgetbkgrnd(WINDOW *win, cchar_t *wch)
    306 {
    307 	return ERR;
    308 }
    309 
    310 #endif /* !HAVE_WCHAR */
    311