lib_bkgd.c revision 166124 
1/****************************************************************************
2 * Copyright (c) 1998-2005,2006 Free Software Foundation, Inc.              *
3 *                                                                          *
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11 *                                                                          *
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14 *                                                                          *
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16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
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24 * holders shall not be used in advertising or otherwise to promote the     *
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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 *     and: Juergen Pfeifer                         1997                    *
33 *     and: Sven Verdoolaege                        2000                    *
34 *     and: Thomas E. Dickey                        1996-on                 *
35 ****************************************************************************/
36
37#include <curses.priv.h>
38
39MODULE_ID("$Id: lib_bkgd.c,v 1.35 2006/05/27 19:20:11 tom Exp $")
40
41/*
42 * Set the window's background information.
43 */
44#if USE_WIDEC_SUPPORT
45NCURSES_EXPORT(void)
46#else
47static NCURSES_INLINE void
48#endif
49wbkgrndset(WINDOW *win, const ARG_CH_T ch)
50{
51    T((T_CALLED("wbkgdset(%p,%s)"), win, _tracech_t(ch)));
52
53    if (win) {
54	attr_t off = AttrOf(win->_nc_bkgd);
55	attr_t on = AttrOf(CHDEREF(ch));
56
57	toggle_attr_off(WINDOW_ATTRS(win), off);
58	toggle_attr_on(WINDOW_ATTRS(win), on);
59
60#if NCURSES_EXT_COLORS
61	{
62	    int pair;
63
64	    if ((pair = GetPair(win->_nc_bkgd)) != 0)
65		SET_WINDOW_PAIR(win, 0);
66	    if ((pair = GetPair(CHDEREF(ch))) != 0)
67		SET_WINDOW_PAIR(win, pair);
68	}
69#endif
70
71	if (CharOf(CHDEREF(ch)) == L('\0')) {
72	    SetChar(win->_nc_bkgd, BLANK_TEXT, AttrOf(CHDEREF(ch)));
73	    SetPair(win->_nc_bkgd, GetPair(CHDEREF(ch)));
74	} else {
75	    win->_nc_bkgd = CHDEREF(ch);
76	}
77#if USE_WIDEC_SUPPORT
78	/*
79	 * If we're compiled for wide-character support, _bkgrnd is the
80	 * preferred location for the background information since it stores
81	 * more than _bkgd.  Update _bkgd each time we modify _bkgrnd, so the
82	 * macro getbkgd() will work.
83	 */
84	{
85	    cchar_t wch;
86	    int tmp;
87
88	    wgetbkgrnd(win, &wch);
89	    tmp = _nc_to_char((wint_t) CharOf(wch));
90
91	    win->_bkgd = (((tmp == EOF) ? ' ' : (chtype) tmp)
92			  | (AttrOf(wch) & ALL_BUT_COLOR)
93			  | COLOR_PAIR(GET_WINDOW_PAIR(win)));
94	}
95#endif
96    }
97    returnVoid;
98}
99
100NCURSES_EXPORT(void)
101wbkgdset(WINDOW *win, chtype ch)
102{
103    NCURSES_CH_T wch;
104    SetChar2(wch, ch);
105    wbkgrndset(win, CHREF(wch));
106}
107
108/*
109 * Set the window's background information and apply it to each cell.
110 */
111#if USE_WIDEC_SUPPORT
112NCURSES_EXPORT(int)
113#else
114static NCURSES_INLINE int
115#undef wbkgrnd
116#endif
117wbkgrnd(WINDOW *win, const ARG_CH_T ch)
118{
119    int code = ERR;
120    int x, y;
121    NCURSES_CH_T new_bkgd = CHDEREF(ch);
122
123    T((T_CALLED("wbkgd(%p,%s)"), win, _tracech_t(ch)));
124
125    if (win) {
126	NCURSES_CH_T old_bkgrnd;
127	wgetbkgrnd(win, &old_bkgrnd);
128
129	wbkgrndset(win, CHREF(new_bkgd));
130	wattrset(win, AttrOf(win->_nc_bkgd));
131
132	for (y = 0; y <= win->_maxy; y++) {
133	    for (x = 0; x <= win->_maxx; x++) {
134		if (CharEq(win->_line[y].text[x], old_bkgrnd)) {
135		    win->_line[y].text[x] = win->_nc_bkgd;
136		} else {
137		    NCURSES_CH_T wch = win->_line[y].text[x];
138		    RemAttr(wch, (~(A_ALTCHARSET | A_CHARTEXT)));
139		    win->_line[y].text[x] = _nc_render(win, wch);
140		}
141	    }
142	}
143	touchwin(win);
144	_nc_synchook(win);
145	code = OK;
146    }
147    returnCode(code);
148}
149
150NCURSES_EXPORT(int)
151wbkgd(WINDOW *win, chtype ch)
152{
153    NCURSES_CH_T wch;
154    SetChar2(wch, ch);
155    return wbkgrnd(win, CHREF(wch));
156}
157