ca189a656ebd8de87ae7600be85b91a4c64316ae
[ncurses.git] / ncurses / base / lib_bkgd.c
1 /****************************************************************************
2  * Copyright (c) 1998,2001-2002 Free Software Foundation, Inc.              *
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10  * furnished to do so, subject to the following conditions:                 *
11  *                                                                          *
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15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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28
29 /****************************************************************************
30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32  ****************************************************************************/
33
34 #include <curses.priv.h>
35
36 MODULE_ID("$Id: lib_bkgd.c,v 1.29 2002/09/22 20:30:32 tom Exp $")
37
38 /*
39  * Set the window's background information.
40  */
41 #if USE_WIDEC_SUPPORT
42 NCURSES_EXPORT(void)
43 #else
44 static inline void
45 #endif
46 wbkgrndset(WINDOW *win, const ARG_CH_T ch)
47 {
48     T((T_CALLED("wbkgdset(%p,%s)"), win, _tracech_t(ch)));
49
50     if (win) {
51         attr_t off = AttrOf(win->_nc_bkgd);
52         attr_t on = AttrOf(CHDEREF(ch));
53
54         toggle_attr_off(win->_attrs, off);
55         toggle_attr_on(win->_attrs, on);
56
57         if (CharOf(CHDEREF(ch)) == L('\0'))
58             SetChar(win->_nc_bkgd, BLANK_TEXT, AttrOf(CHDEREF(ch)));
59         else
60             win->_nc_bkgd = CHDEREF(ch);
61 #if USE_WIDEC_SUPPORT
62         /*
63          * If we're compiled for wide-character support, _bkgrnd is the
64          * preferred location for the background information since it stores
65          * more than _bkgd.  Update _bkgd each time we modify _bkgrnd, so the
66          * macro getbkgd() will work.
67          */
68         {
69             cchar_t wch;
70             int tmp;
71
72             wgetbkgrnd(win, &wch);
73             tmp = wctob(CharOf(wch));
74
75             win->_bkgd = ((tmp == EOF) ? ' ' : (chtype) tmp) | AttrOf(wch);
76         }
77 #endif
78     }
79     returnVoid;
80 }
81
82 NCURSES_EXPORT(void)
83 wbkgdset(WINDOW *win, chtype ch)
84 {
85     NCURSES_CH_T wch;
86     SetChar2(wch, ch);
87     wbkgrndset(win, CHREF(wch));
88 }
89
90 /*
91  * Set the window's background information and apply it to each cell.
92  */
93 #if USE_WIDEC_SUPPORT
94 NCURSES_EXPORT(int)
95 #else
96 static inline int
97 #undef wbkgrnd
98 #endif
99 wbkgrnd(WINDOW *win, const ARG_CH_T ch)
100 {
101     int code = ERR;
102     int x, y;
103     NCURSES_CH_T new_bkgd = CHDEREF(ch);
104
105     T((T_CALLED("wbkgd(%p,%s)"), win, _tracech_t(ch)));
106
107     if (win) {
108         NCURSES_CH_T old_bkgrnd;
109         wgetbkgrnd(win, &old_bkgrnd);
110
111         wbkgrndset(win, CHREF(new_bkgd));
112         wattrset(win, AttrOf(win->_nc_bkgd));
113
114         for (y = 0; y <= win->_maxy; y++) {
115             for (x = 0; x <= win->_maxx; x++) {
116                 if (CharEq(win->_line[y].text[x], old_bkgrnd))
117                     win->_line[y].text[x] = win->_nc_bkgd;
118                 else {
119                     NCURSES_CH_T wch = win->_line[y].text[x];
120                     RemAttr(wch, (~A_ALTCHARSET));
121                     win->_line[y].text[x] = _nc_render(win, wch);
122                 }
123             }
124         }
125         touchwin(win);
126         _nc_synchook(win);
127         code = OK;
128     }
129     returnCode(code);
130 }
131
132 NCURSES_EXPORT(int)
133 wbkgd(WINDOW *win, chtype ch)
134 {
135     NCURSES_CH_T wch;
136     SetChar2(wch, ch);
137     return wbkgrnd(win, CHREF(wch));
138 }