lib_bkgd.c revision 97049 
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2 * Copyright (c) 1998,2000,2001 Free Software Foundation, Inc.              *
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13 * in all copies or substantial portions of the Software.                   *
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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
36MODULE_ID("$Id: lib_bkgd.c,v 1.26 2001/12/19 01:36:58 tom Exp $")
37
38/*
39 * Set the window's background information.
40 */
41#if USE_WIDEC_SUPPORT
42NCURSES_EXPORT(void)
43#else
44static inline void
45#endif
46wbkgrndset(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
82NCURSES_EXPORT(void)
83wbkgdset(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
94NCURSES_EXPORT(int)
95#else
96static inline int
97#undef wbkgrnd
98#endif
99wbkgrnd(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
132NCURSES_EXPORT(int)
133wbkgd(WINDOW *win, const chtype ch)
134{
135    NCURSES_CH_T wch;
136    SetChar2(wch, ch);
137    return wbkgrnd(win, CHREF(wch));
138}
139