xref: /freebsd/contrib/ncurses/ncurses/tty/lib_vidattr.c (revision 9a14aa017b21c292740c00ee098195cd46642730)
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14  *                                                                          *
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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: Thomas E. Dickey                        1996 on                 *
33  ****************************************************************************/
34 
35 /*
36  *	vidputs(newmode, outc)
37  *
38  *	newmode is taken to be the logical 'or' of the symbols in curses.h
39  *	representing graphic renditions.  The terminal is set to be in all of
40  *	the given modes, if possible.
41  *
42  *	if the new attribute is normal
43  *		if exit-alt-char-set exists
44  *			emit it
45  *		emit exit-attribute-mode
46  *	else if set-attributes exists
47  *		use it to set exactly what you want
48  *	else
49  *		if exit-attribute-mode exists
50  *			turn off everything
51  *		else
52  *			turn off those which can be turned off and aren't in
53  *			newmode.
54  *		turn on each mode which should be on and isn't, one by one
55  *
56  *	NOTE that this algorithm won't achieve the desired mix of attributes
57  *	in some cases, but those are probably just those cases in which it is
58  *	actually impossible, anyway, so...
59  *
60  * 	NOTE that we cannot assume that there's no interaction between color
61  *	and other attribute resets.  So each time we reset color (or other
62  *	attributes) we'll have to be prepared to restore the other.
63  */
64 
65 #include <curses.priv.h>
66 #include <term.h>
67 
68 MODULE_ID("$Id: lib_vidattr.c,v 1.49 2007/06/30 21:58:04 tom Exp $")
69 
70 #define doPut(mode) TPUTS_TRACE(#mode); tputs(mode, 1, outc)
71 
72 #define TurnOn(mask,mode) \
73 	if ((turn_on & mask) && mode) { doPut(mode); }
74 
75 #define TurnOff(mask,mode) \
76 	if ((turn_off & mask) && mode) { doPut(mode); turn_off &= ~mask; }
77 
78 	/* if there is no current screen, assume we *can* do color */
79 #define SetColorsIf(why,old_attr) \
80 	if (can_color && (why)) { \
81 		int old_pair = PAIR_NUMBER(old_attr); \
82 		TR(TRACE_ATTRS, ("old pair = %d -- new pair = %d", old_pair, pair)); \
83 		if ((pair != old_pair) \
84 		 || (fix_pair0 && (pair == 0)) \
85 		 || (reverse ^ ((old_attr & A_REVERSE) != 0))) { \
86 			_nc_do_color(old_pair, pair, reverse, outc); \
87 		} \
88 	}
89 
90 #define PreviousAttr _nc_prescreen.previous_attr
91 
92 NCURSES_EXPORT(int)
93 vidputs(chtype newmode, int (*outc) (int))
94 {
95     attr_t turn_on, turn_off;
96     int pair;
97     bool reverse = FALSE;
98     bool can_color = (SP == 0 || SP->_coloron);
99 #if NCURSES_EXT_FUNCS
100     bool fix_pair0 = (SP != 0 && SP->_coloron && !SP->_default_color);
101 #else
102 #define fix_pair0 FALSE
103 #endif
104 
105     newmode &= A_ATTRIBUTES;
106     T((T_CALLED("vidputs(%s)"), _traceattr(newmode)));
107 
108     /* this allows us to go on whether or not newterm() has been called */
109     if (SP)
110 	PreviousAttr = AttrOf(SCREEN_ATTRS(SP));
111 
112     TR(TRACE_ATTRS, ("previous attribute was %s", _traceattr(PreviousAttr)));
113 
114     if ((SP != 0)
115 	&& (magic_cookie_glitch > 0)) {
116 #if USE_XMC_SUPPORT
117 	static const chtype table[] =
118 	{
119 	    A_STANDOUT,
120 	    A_UNDERLINE,
121 	    A_REVERSE,
122 	    A_BLINK,
123 	    A_DIM,
124 	    A_BOLD,
125 	    A_INVIS,
126 	    A_PROTECT,
127 	};
128 	unsigned n;
129 	int used = 0;
130 	int limit = (max_attributes <= 0) ? 1 : max_attributes;
131 	chtype retain = 0;
132 
133 	/*
134 	 * Limit the number of attribute bits set in the newmode according to
135 	 * the terminfo max_attributes value.
136 	 */
137 	for (n = 0; n < SIZEOF(table); ++n) {
138 	    if ((table[n] & SP->_ok_attributes) == 0) {
139 		newmode &= ~table[n];
140 	    } else if ((table[n] & newmode) != 0) {
141 		if (used++ >= limit) {
142 		    newmode &= ~table[n];
143 		    if (newmode == retain)
144 			break;
145 		} else {
146 		    retain = newmode;
147 		}
148 	    }
149 	}
150 #else
151 	newmode &= ~(SP->_xmc_suppress);
152 #endif
153 	TR(TRACE_ATTRS, ("suppressed attribute is %s", _traceattr(newmode)));
154     }
155 
156     /*
157      * If we have a terminal that cannot combine color with video
158      * attributes, use the colors in preference.
159      */
160     if (((newmode & A_COLOR) != 0
161 	 || fix_pair0)
162 	&& (no_color_video > 0)) {
163 	/*
164 	 * If we had chosen the A_xxx definitions to correspond to the
165 	 * no_color_video mask, we could simply shift it up and mask off the
166 	 * attributes.  But we did not (actually copied Solaris' definitions).
167 	 * However, this is still simpler/faster than a lookup table.
168 	 *
169 	 * The 63 corresponds to A_STANDOUT, A_UNDERLINE, A_REVERSE, A_BLINK,
170 	 * A_DIM, A_BOLD which are 1:1 with no_color_video.  The bits that
171 	 * correspond to A_INVIS, A_PROTECT (192) must be shifted up 1 and
172 	 * A_ALTCHARSET (256) down 2 to line up.  We use the NCURSES_BITS
173 	 * macro so this will work properly for the wide-character layout.
174 	 */
175 	unsigned value = no_color_video;
176 	attr_t mask = NCURSES_BITS((value & 63)
177 				   | ((value & 192) << 1)
178 				   | ((value & 256) >> 2), 8);
179 
180 	if ((mask & A_REVERSE) != 0
181 	    && (newmode & A_REVERSE) != 0) {
182 	    reverse = TRUE;
183 	    mask &= ~A_REVERSE;
184 	}
185 	newmode &= ~mask;
186     }
187 
188     if (newmode == PreviousAttr)
189 	returnCode(OK);
190 
191     pair = PAIR_NUMBER(newmode);
192 
193     if (reverse) {
194 	newmode &= ~A_REVERSE;
195     }
196 
197     turn_off = (~newmode & PreviousAttr) & ALL_BUT_COLOR;
198     turn_on = (newmode & ~PreviousAttr) & ALL_BUT_COLOR;
199 
200     SetColorsIf(((pair == 0) && !fix_pair0), PreviousAttr);
201 
202     if (newmode == A_NORMAL) {
203 	if ((PreviousAttr & A_ALTCHARSET) && exit_alt_charset_mode) {
204 	    doPut(exit_alt_charset_mode);
205 	    PreviousAttr &= ~A_ALTCHARSET;
206 	}
207 	if (PreviousAttr) {
208 	    if (exit_attribute_mode) {
209 		doPut(exit_attribute_mode);
210 	    } else {
211 		if (!SP || SP->_use_rmul) {
212 		    TurnOff(A_UNDERLINE, exit_underline_mode);
213 		}
214 		if (!SP || SP->_use_rmso) {
215 		    TurnOff(A_STANDOUT, exit_standout_mode);
216 		}
217 	    }
218 	    PreviousAttr &= ALL_BUT_COLOR;
219 	}
220 
221 	SetColorsIf((pair != 0) || fix_pair0, PreviousAttr);
222     } else if (set_attributes) {
223 	if (turn_on || turn_off) {
224 	    TPUTS_TRACE("set_attributes");
225 	    tputs(tparm(set_attributes,
226 			(newmode & A_STANDOUT) != 0,
227 			(newmode & A_UNDERLINE) != 0,
228 			(newmode & A_REVERSE) != 0,
229 			(newmode & A_BLINK) != 0,
230 			(newmode & A_DIM) != 0,
231 			(newmode & A_BOLD) != 0,
232 			(newmode & A_INVIS) != 0,
233 			(newmode & A_PROTECT) != 0,
234 			(newmode & A_ALTCHARSET) != 0), 1, outc);
235 	    PreviousAttr &= ALL_BUT_COLOR;
236 	}
237 	SetColorsIf((pair != 0) || fix_pair0, PreviousAttr);
238     } else {
239 
240 	TR(TRACE_ATTRS, ("turning %s off", _traceattr(turn_off)));
241 
242 	TurnOff(A_ALTCHARSET, exit_alt_charset_mode);
243 
244 	if (!SP || SP->_use_rmul) {
245 	    TurnOff(A_UNDERLINE, exit_underline_mode);
246 	}
247 
248 	if (!SP || SP->_use_rmso) {
249 	    TurnOff(A_STANDOUT, exit_standout_mode);
250 	}
251 
252 	if (turn_off && exit_attribute_mode) {
253 	    doPut(exit_attribute_mode);
254 	    turn_on |= (newmode & ALL_BUT_COLOR);
255 	    PreviousAttr &= ALL_BUT_COLOR;
256 	}
257 	SetColorsIf((pair != 0) || fix_pair0, PreviousAttr);
258 
259 	TR(TRACE_ATTRS, ("turning %s on", _traceattr(turn_on)));
260 	/* *INDENT-OFF* */
261 	TurnOn(A_ALTCHARSET,	enter_alt_charset_mode);
262 	TurnOn(A_BLINK,		enter_blink_mode);
263 	TurnOn(A_BOLD,		enter_bold_mode);
264 	TurnOn(A_DIM,		enter_dim_mode);
265 	TurnOn(A_REVERSE,	enter_reverse_mode);
266 	TurnOn(A_STANDOUT,	enter_standout_mode);
267 	TurnOn(A_PROTECT,	enter_protected_mode);
268 	TurnOn(A_INVIS,		enter_secure_mode);
269 	TurnOn(A_UNDERLINE,	enter_underline_mode);
270 #if USE_WIDEC_SUPPORT
271 	TurnOn(A_HORIZONTAL,	enter_horizontal_hl_mode);
272 	TurnOn(A_LEFT,		enter_left_hl_mode);
273 	TurnOn(A_LOW,		enter_low_hl_mode);
274 	TurnOn(A_RIGHT,		enter_right_hl_mode);
275 	TurnOn(A_TOP,		enter_top_hl_mode);
276 	TurnOn(A_VERTICAL,	enter_vertical_hl_mode);
277 #endif
278 	/* *INDENT-ON* */
279 
280     }
281 
282     if (reverse)
283 	newmode |= A_REVERSE;
284 
285     if (SP)
286 	SetAttr(SCREEN_ATTRS(SP), newmode);
287     else
288 	PreviousAttr = newmode;
289 
290     returnCode(OK);
291 }
292 
293 NCURSES_EXPORT(int)
294 vidattr(chtype newmode)
295 {
296     T((T_CALLED("vidattr(%s)"), _traceattr(newmode)));
297 
298     returnCode(vidputs(newmode, _nc_outch));
299 }
300 
301 NCURSES_EXPORT(chtype)
302 termattrs(void)
303 {
304     chtype attrs = A_NORMAL;
305 
306     T((T_CALLED("termattrs()")));
307     if (enter_alt_charset_mode)
308 	attrs |= A_ALTCHARSET;
309 
310     if (enter_blink_mode)
311 	attrs |= A_BLINK;
312 
313     if (enter_bold_mode)
314 	attrs |= A_BOLD;
315 
316     if (enter_dim_mode)
317 	attrs |= A_DIM;
318 
319     if (enter_reverse_mode)
320 	attrs |= A_REVERSE;
321 
322     if (enter_standout_mode)
323 	attrs |= A_STANDOUT;
324 
325     if (enter_protected_mode)
326 	attrs |= A_PROTECT;
327 
328     if (enter_secure_mode)
329 	attrs |= A_INVIS;
330 
331     if (enter_underline_mode)
332 	attrs |= A_UNDERLINE;
333 
334     if (SP->_coloron)
335 	attrs |= A_COLOR;
336 
337     returnChar(attrs);
338 }
339