1/****************************************************************************
2 * Copyright (c) 1998-2013,2014 Free Software Foundation, Inc.              *
3 *                                                                          *
4 * Permission is hereby granted, free of charge, to any person obtaining a  *
5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
7 * without limitation the rights to use, copy, modify, merge, publish,      *
8 * distribute, distribute with modifications, sublicense, and/or sell       *
9 * copies of the Software, and to permit persons to whom the Software is    *
10 * furnished to do so, subject to the following conditions:                 *
11 *                                                                          *
12 * The above copyright notice and this permission notice shall be included  *
13 * in all copies or substantial portions of the Software.                   *
14 *                                                                          *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22 *                                                                          *
23 * Except as contained in this notice, the name(s) of the above copyright   *
24 * holders shall not be used in advertising or otherwise to promote the     *
25 * sale, use or other dealings in this Software without prior written       *
26 * authorization.                                                           *
27 ****************************************************************************/
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 *     and: Juergen Pfeifer                         2009                    *
34 ****************************************************************************/
35
36/* lib_color.c
37 *
38 * Handles color emulation of SYS V curses
39 */
40
41#include <curses.priv.h>
42#include <tic.h>
43
44#ifndef CUR
45#define CUR SP_TERMTYPE
46#endif
47
48MODULE_ID("$Id: lib_color.c,v 1.109 2014/02/01 22:22:30 tom Exp $")
49
50#ifdef USE_TERM_DRIVER
51#define CanChange      InfoOf(SP_PARM).canchange
52#define DefaultPalette InfoOf(SP_PARM).defaultPalette
53#define HasColor       InfoOf(SP_PARM).hascolor
54#define InitColor      InfoOf(SP_PARM).initcolor
55#define MaxColors      InfoOf(SP_PARM).maxcolors
56#define MaxPairs       InfoOf(SP_PARM).maxpairs
57#define UseHlsPalette  (DefaultPalette == _nc_hls_palette)
58#else
59#define CanChange      can_change
60#define DefaultPalette (hue_lightness_saturation ? hls_palette : cga_palette)
61#define HasColor       has_color
62#define InitColor      initialize_color
63#define MaxColors      max_colors
64#define MaxPairs       max_pairs
65#define UseHlsPalette  (hue_lightness_saturation)
66#endif
67
68#ifndef USE_TERM_DRIVER
69/*
70 * These should be screen structure members.  They need to be globals for
71 * historical reasons.  So we assign them in start_color() and also in
72 * set_term()'s screen-switching logic.
73 */
74#if USE_REENTRANT
75NCURSES_EXPORT(int)
76NCURSES_PUBLIC_VAR(COLOR_PAIRS) (void)
77{
78    return SP ? SP->_pair_count : -1;
79}
80NCURSES_EXPORT(int)
81NCURSES_PUBLIC_VAR(COLORS) (void)
82{
83    return SP ? SP->_color_count : -1;
84}
85#else
86NCURSES_EXPORT_VAR(int) COLOR_PAIRS = 0;
87NCURSES_EXPORT_VAR(int) COLORS = 0;
88#endif
89#endif /* !USE_TERM_DRIVER */
90
91#define DATA(r,g,b) {r,g,b, 0,0,0, 0}
92
93#define TYPE_CALLOC(type,elts) typeCalloc(type, (unsigned)(elts))
94
95#define MAX_PALETTE	8
96
97#define OkColorHi(n)	(((n) < COLORS) && ((n) < maxcolors))
98#define InPalette(n)	((n) >= 0 && (n) < MAX_PALETTE)
99
100/*
101 * Given a RGB range of 0..1000, we'll normally set the individual values
102 * to about 2/3 of the maximum, leaving full-range for bold/bright colors.
103 */
104#define RGB_ON  680
105#define RGB_OFF 0
106/* *INDENT-OFF* */
107static const color_t cga_palette[] =
108{
109    /*  R               G               B */
110    DATA(RGB_OFF,	RGB_OFF,	RGB_OFF),	/* COLOR_BLACK */
111    DATA(RGB_ON,	RGB_OFF,	RGB_OFF),	/* COLOR_RED */
112    DATA(RGB_OFF,	RGB_ON,		RGB_OFF),	/* COLOR_GREEN */
113    DATA(RGB_ON,	RGB_ON,		RGB_OFF),	/* COLOR_YELLOW */
114    DATA(RGB_OFF,	RGB_OFF,	RGB_ON),	/* COLOR_BLUE */
115    DATA(RGB_ON,	RGB_OFF,	RGB_ON),	/* COLOR_MAGENTA */
116    DATA(RGB_OFF,	RGB_ON,		RGB_ON),	/* COLOR_CYAN */
117    DATA(RGB_ON,	RGB_ON,		RGB_ON),	/* COLOR_WHITE */
118};
119
120static const color_t hls_palette[] =
121{
122    /*  	H       L       S */
123    DATA(	0,	0,	0),		/* COLOR_BLACK */
124    DATA(	120,	50,	100),		/* COLOR_RED */
125    DATA(	240,	50,	100),		/* COLOR_GREEN */
126    DATA(	180,	50,	100),		/* COLOR_YELLOW */
127    DATA(	330,	50,	100),		/* COLOR_BLUE */
128    DATA(	60,	50,	100),		/* COLOR_MAGENTA */
129    DATA(	300,	50,	100),		/* COLOR_CYAN */
130    DATA(	0,	50,	100),		/* COLOR_WHITE */
131};
132
133#ifdef USE_TERM_DRIVER
134NCURSES_EXPORT_VAR(const color_t*) _nc_cga_palette = cga_palette;
135NCURSES_EXPORT_VAR(const color_t*) _nc_hls_palette = hls_palette;
136#endif
137
138/* *INDENT-ON* */
139
140/*
141 * Ensure that we use color pairs only when colors have been started, and also
142 * that the index is within the limits of the table which we allocated.
143 */
144#define ValidPair(pair) \
145    ((SP_PARM != 0) && (pair >= 0) && (pair < SP_PARM->_pair_limit) && SP_PARM->_coloron)
146
147#if NCURSES_EXT_FUNCS
148/*
149 * These are called from _nc_do_color(), which in turn is called from
150 * vidattr - so we have to assume that sp may be null.
151 */
152static int
153default_fg(NCURSES_SP_DCL0)
154{
155    return (SP_PARM != 0) ? SP_PARM->_default_fg : COLOR_WHITE;
156}
157
158static int
159default_bg(NCURSES_SP_DCL0)
160{
161    return SP_PARM != 0 ? SP_PARM->_default_bg : COLOR_BLACK;
162}
163#else
164#define default_fg(sp) COLOR_WHITE
165#define default_bg(sp) COLOR_BLACK
166#endif
167
168#ifndef USE_TERM_DRIVER
169/*
170 * SVr4 curses is known to interchange color codes (1,4) and (3,6), possibly
171 * to maintain compatibility with a pre-ANSI scheme.  The same scheme is
172 * also used in the FreeBSD syscons.
173 */
174static int
175toggled_colors(int c)
176{
177    if (c < 16) {
178	static const int table[] =
179	{0, 4, 2, 6, 1, 5, 3, 7,
180	 8, 12, 10, 14, 9, 13, 11, 15};
181	c = table[c];
182    }
183    return c;
184}
185#endif
186
187static void
188set_background_color(NCURSES_SP_DCLx int bg, NCURSES_SP_OUTC outc)
189{
190#ifdef USE_TERM_DRIVER
191    CallDriver_3(SP_PARM, color, FALSE, bg, outc);
192#else
193    if (set_a_background) {
194	TPUTS_TRACE("set_a_background");
195	NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx
196				TPARM_1(set_a_background, bg),
197				1, outc);
198    } else {
199	TPUTS_TRACE("set_background");
200	NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx
201				TPARM_1(set_background, toggled_colors(bg)),
202				1, outc);
203    }
204#endif
205}
206
207static void
208set_foreground_color(NCURSES_SP_DCLx int fg, NCURSES_SP_OUTC outc)
209{
210#ifdef USE_TERM_DRIVER
211    CallDriver_3(SP_PARM, color, TRUE, fg, outc);
212#else
213    if (set_a_foreground) {
214	TPUTS_TRACE("set_a_foreground");
215	NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx
216				TPARM_1(set_a_foreground, fg),
217				1, outc);
218    } else {
219	TPUTS_TRACE("set_foreground");
220	NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx
221				TPARM_1(set_foreground, toggled_colors(fg)),
222				1, outc);
223    }
224#endif
225}
226
227static void
228init_color_table(NCURSES_SP_DCL0)
229{
230    const color_t *tp = DefaultPalette;
231    int n;
232
233    assert(tp != 0);
234
235    for (n = 0; n < COLORS; n++) {
236	if (InPalette(n)) {
237	    SP_PARM->_color_table[n] = tp[n];
238	} else {
239	    SP_PARM->_color_table[n] = tp[n % MAX_PALETTE];
240	    if (UseHlsPalette) {
241		SP_PARM->_color_table[n].green = 100;
242	    } else {
243		if (SP_PARM->_color_table[n].red)
244		    SP_PARM->_color_table[n].red = 1000;
245		if (SP_PARM->_color_table[n].green)
246		    SP_PARM->_color_table[n].green = 1000;
247		if (SP_PARM->_color_table[n].blue)
248		    SP_PARM->_color_table[n].blue = 1000;
249	    }
250	}
251    }
252}
253
254/*
255 * Reset the color pair, e.g., to whatever color pair 0 is.
256 */
257static bool
258reset_color_pair(NCURSES_SP_DCL0)
259{
260#ifdef USE_TERM_DRIVER
261    return CallDriver(SP_PARM, rescol);
262#else
263    bool result = FALSE;
264
265    (void) SP_PARM;
266    if (orig_pair != 0) {
267	(void) NCURSES_PUTP2("orig_pair", orig_pair);
268	result = TRUE;
269    }
270    return result;
271#endif
272}
273
274/*
275 * Reset color pairs and definitions.  Actually we do both more to accommodate
276 * badly-written terminal descriptions than for the relatively rare case where
277 * someone has changed the color definitions.
278 */
279NCURSES_EXPORT(bool)
280NCURSES_SP_NAME(_nc_reset_colors) (NCURSES_SP_DCL0)
281{
282    int result = FALSE;
283
284    T((T_CALLED("_nc_reset_colors(%p)"), (void *) SP_PARM));
285    if (SP_PARM->_color_defs > 0)
286	SP_PARM->_color_defs = -(SP_PARM->_color_defs);
287    if (reset_color_pair(NCURSES_SP_ARG))
288	result = TRUE;
289
290#ifdef USE_TERM_DRIVER
291    result = CallDriver(SP_PARM, rescolors);
292#else
293    if (orig_colors != 0) {
294	NCURSES_PUTP2("orig_colors", orig_colors);
295	result = TRUE;
296    }
297#endif
298    returnBool(result);
299}
300
301#if NCURSES_SP_FUNCS
302NCURSES_EXPORT(bool)
303_nc_reset_colors(void)
304{
305    return NCURSES_SP_NAME(_nc_reset_colors) (CURRENT_SCREEN);
306}
307#endif
308
309NCURSES_EXPORT(int)
310NCURSES_SP_NAME(start_color) (NCURSES_SP_DCL0)
311{
312    int result = ERR;
313    int maxpairs = 0, maxcolors = 0;
314
315    T((T_CALLED("start_color(%p)"), (void *) SP_PARM));
316
317    if (SP_PARM == 0) {
318	result = ERR;
319    } else if (SP_PARM->_coloron) {
320	result = OK;
321    } else {
322	maxpairs = MaxPairs;
323	maxcolors = MaxColors;
324	if (reset_color_pair(NCURSES_SP_ARG) != TRUE) {
325	    set_foreground_color(NCURSES_SP_ARGx
326				 default_fg(NCURSES_SP_ARG),
327				 NCURSES_SP_NAME(_nc_outch));
328	    set_background_color(NCURSES_SP_ARGx
329				 default_bg(NCURSES_SP_ARG),
330				 NCURSES_SP_NAME(_nc_outch));
331	}
332#if !NCURSES_EXT_COLORS
333	/*
334	 * Without ext-colors, we cannot represent more than 256 color pairs.
335	 */
336	if (maxpairs > 256)
337	    maxpairs = 256;
338#endif
339
340	if (maxpairs > 0 && maxcolors > 0) {
341	    SP_PARM->_pair_limit = maxpairs;
342
343#if NCURSES_EXT_FUNCS
344	    /*
345	     * If using default colors, allocate extra space in table to
346	     * allow for default-color as a component of a color-pair.
347	     */
348	    SP_PARM->_pair_limit += (1 + (2 * maxcolors));
349#endif
350	    SP_PARM->_pair_count = maxpairs;
351	    SP_PARM->_color_count = maxcolors;
352#if !USE_REENTRANT
353	    COLOR_PAIRS = maxpairs;
354	    COLORS = maxcolors;
355#endif
356
357	    SP_PARM->_color_pairs = TYPE_CALLOC(colorpair_t, SP_PARM->_pair_limit);
358	    if (SP_PARM->_color_pairs != 0) {
359		SP_PARM->_color_table = TYPE_CALLOC(color_t, maxcolors);
360		if (SP_PARM->_color_table != 0) {
361		    SP_PARM->_color_pairs[0] = PAIR_OF(default_fg(NCURSES_SP_ARG),
362						       default_bg(NCURSES_SP_ARG));
363		    init_color_table(NCURSES_SP_ARG);
364
365		    T(("started color: COLORS = %d, COLOR_PAIRS = %d",
366		       COLORS, COLOR_PAIRS));
367
368		    SP_PARM->_coloron = 1;
369		    result = OK;
370		} else if (SP_PARM->_color_pairs != 0) {
371		    FreeAndNull(SP_PARM->_color_pairs);
372		}
373	    }
374	} else {
375	    result = OK;
376	}
377    }
378    returnCode(result);
379}
380
381#if NCURSES_SP_FUNCS
382NCURSES_EXPORT(int)
383start_color(void)
384{
385    return NCURSES_SP_NAME(start_color) (CURRENT_SCREEN);
386}
387#endif
388
389/* This function was originally written by Daniel Weaver <danw@znyx.com> */
390static void
391rgb2hls(int r, int g, int b, NCURSES_COLOR_T *h, NCURSES_COLOR_T *l, NCURSES_COLOR_T *s)
392/* convert RGB to HLS system */
393{
394    int min, max, t;
395
396    if ((min = g < r ? g : r) > b)
397	min = b;
398    if ((max = g > r ? g : r) < b)
399	max = b;
400
401    /* calculate lightness */
402    *l = (NCURSES_COLOR_T) ((min + max) / 20);
403
404    if (min == max) {		/* black, white and all shades of gray */
405	*h = 0;
406	*s = 0;
407	return;
408    }
409
410    /* calculate saturation */
411    if (*l < 50)
412	*s = (NCURSES_COLOR_T) (((max - min) * 100) / (max + min));
413    else
414	*s = (NCURSES_COLOR_T) (((max - min) * 100) / (2000 - max - min));
415
416    /* calculate hue */
417    if (r == max)
418	t = (NCURSES_COLOR_T) (120 + ((g - b) * 60) / (max - min));
419    else if (g == max)
420	t = (NCURSES_COLOR_T) (240 + ((b - r) * 60) / (max - min));
421    else
422	t = (NCURSES_COLOR_T) (360 + ((r - g) * 60) / (max - min));
423
424    *h = (NCURSES_COLOR_T) (t % 360);
425}
426
427/*
428 * Extension (1997/1/18) - Allow negative f/b values to set default color
429 * values.
430 */
431NCURSES_EXPORT(int)
432NCURSES_SP_NAME(init_pair) (NCURSES_SP_DCLx
433			    NCURSES_PAIRS_T pair,
434			    NCURSES_COLOR_T f,
435			    NCURSES_COLOR_T b)
436{
437    colorpair_t result;
438    colorpair_t previous;
439    int maxcolors;
440
441    T((T_CALLED("init_pair(%p,%d,%d,%d)"),
442       (void *) SP_PARM,
443       (int) pair,
444       (int) f,
445       (int) b));
446
447    if (!ValidPair(pair))
448	returnCode(ERR);
449
450    maxcolors = MaxColors;
451
452    previous = SP_PARM->_color_pairs[pair];
453#if NCURSES_EXT_FUNCS
454    if (SP_PARM->_default_color || SP_PARM->_assumed_color) {
455	bool isDefault = FALSE;
456	bool wasDefault = FALSE;
457	int default_pairs = SP_PARM->_default_pairs;
458
459	/*
460	 * Map caller's color number, e.g., -1, 0, 1, .., 7, etc., into
461	 * internal unsigned values which we will store in the _color_pairs[]
462	 * table.
463	 */
464	if (isDefaultColor(f)) {
465	    f = COLOR_DEFAULT;
466	    isDefault = TRUE;
467	} else if (!OkColorHi(f)) {
468	    returnCode(ERR);
469	}
470
471	if (isDefaultColor(b)) {
472	    b = COLOR_DEFAULT;
473	    isDefault = TRUE;
474	} else if (!OkColorHi(b)) {
475	    returnCode(ERR);
476	}
477
478	/*
479	 * Check if the table entry that we are going to init/update used
480	 * default colors.
481	 */
482	if ((FORE_OF(previous) == COLOR_DEFAULT)
483	    || (BACK_OF(previous) == COLOR_DEFAULT))
484	    wasDefault = TRUE;
485
486	/*
487	 * Keep track of the number of entries in the color pair table which
488	 * used a default color.
489	 */
490	if (isDefault && !wasDefault) {
491	    ++default_pairs;
492	} else if (wasDefault && !isDefault) {
493	    --default_pairs;
494	}
495
496	/*
497	 * As an extension, ncurses allows the pair number to exceed the
498	 * terminal's color_pairs value for pairs using a default color.
499	 *
500	 * Note that updating a pair which used a default color with one
501	 * that does not will decrement the count - and possibly interfere
502	 * with sequentially adding new pairs.
503	 */
504	if (pair > (SP_PARM->_pair_count + default_pairs)) {
505	    returnCode(ERR);
506	}
507	SP_PARM->_default_pairs = default_pairs;
508    } else
509#endif
510    {
511	if ((f < 0) || !OkColorHi(f)
512	    || (b < 0) || !OkColorHi(b)
513	    || (pair < 1)) {
514	    returnCode(ERR);
515	}
516    }
517
518    /*
519     * When a pair's content is changed, replace its colors (if pair was
520     * initialized before a screen update is performed replacing original
521     * pair colors with the new ones).
522     */
523    result = PAIR_OF(f, b);
524    if (previous != 0
525	&& previous != result) {
526	int y, x;
527
528	for (y = 0; y <= CurScreen(SP_PARM)->_maxy; y++) {
529	    struct ldat *ptr = &(CurScreen(SP_PARM)->_line[y]);
530	    bool changed = FALSE;
531	    for (x = 0; x <= CurScreen(SP_PARM)->_maxx; x++) {
532		if (GetPair(ptr->text[x]) == pair) {
533		    /* Set the old cell to zero to ensure it will be
534		       updated on the next doupdate() */
535		    SetChar(ptr->text[x], 0, 0);
536		    CHANGED_CELL(ptr, x);
537		    changed = TRUE;
538		}
539	    }
540	    if (changed)
541		NCURSES_SP_NAME(_nc_make_oldhash) (NCURSES_SP_ARGx y);
542	}
543    }
544
545    SP_PARM->_color_pairs[pair] = result;
546    if (GET_SCREEN_PAIR(SP_PARM) == pair)
547	SET_SCREEN_PAIR(SP_PARM, (chtype) (~0));	/* force attribute update */
548
549#ifdef USE_TERM_DRIVER
550    CallDriver_3(SP_PARM, initpair, pair, f, b);
551#else
552    if (initialize_pair && InPalette(f) && InPalette(b)) {
553	const color_t *tp = DefaultPalette;
554
555	TR(TRACE_ATTRS,
556	   ("initializing pair: pair = %d, fg=(%d,%d,%d), bg=(%d,%d,%d)",
557	    (int) pair,
558	    (int) tp[f].red, (int) tp[f].green, (int) tp[f].blue,
559	    (int) tp[b].red, (int) tp[b].green, (int) tp[b].blue));
560
561	NCURSES_PUTP2("initialize_pair",
562		      TPARM_7(initialize_pair,
563			      pair,
564			      (int) tp[f].red,
565			      (int) tp[f].green,
566			      (int) tp[f].blue,
567			      (int) tp[b].red,
568			      (int) tp[b].green,
569			      (int) tp[b].blue));
570    }
571#endif
572
573    returnCode(OK);
574}
575
576#if NCURSES_SP_FUNCS
577NCURSES_EXPORT(int)
578init_pair(NCURSES_COLOR_T pair, NCURSES_COLOR_T f, NCURSES_COLOR_T b)
579{
580    return NCURSES_SP_NAME(init_pair) (CURRENT_SCREEN, pair, f, b);
581}
582#endif
583
584#define okRGB(n) ((n) >= 0 && (n) <= 1000)
585
586NCURSES_EXPORT(int)
587NCURSES_SP_NAME(init_color) (NCURSES_SP_DCLx
588			     NCURSES_COLOR_T color,
589			     NCURSES_COLOR_T r,
590			     NCURSES_COLOR_T g,
591			     NCURSES_COLOR_T b)
592{
593    int result = ERR;
594    int maxcolors;
595
596    T((T_CALLED("init_color(%p,%d,%d,%d,%d)"),
597       (void *) SP_PARM,
598       color,
599       r, g, b));
600
601    if (SP_PARM == 0)
602	returnCode(result);
603
604    maxcolors = MaxColors;
605
606    if (InitColor
607	&& SP_PARM->_coloron
608	&& (color >= 0 && OkColorHi(color))
609	&& (okRGB(r) && okRGB(g) && okRGB(b))) {
610
611	SP_PARM->_color_table[color].init = 1;
612	SP_PARM->_color_table[color].r = r;
613	SP_PARM->_color_table[color].g = g;
614	SP_PARM->_color_table[color].b = b;
615
616	if (UseHlsPalette) {
617	    rgb2hls(r, g, b,
618		    &SP_PARM->_color_table[color].red,
619		    &SP_PARM->_color_table[color].green,
620		    &SP_PARM->_color_table[color].blue);
621	} else {
622	    SP_PARM->_color_table[color].red = r;
623	    SP_PARM->_color_table[color].green = g;
624	    SP_PARM->_color_table[color].blue = b;
625	}
626
627#ifdef USE_TERM_DRIVER
628	CallDriver_4(SP_PARM, initcolor, color, r, g, b);
629#else
630	NCURSES_PUTP2("initialize_color",
631		      TPARM_4(initialize_color, color, r, g, b));
632#endif
633	SP_PARM->_color_defs = max(color + 1, SP_PARM->_color_defs);
634
635	result = OK;
636    }
637    returnCode(result);
638}
639
640#if NCURSES_SP_FUNCS
641NCURSES_EXPORT(int)
642init_color(NCURSES_COLOR_T color,
643	   NCURSES_COLOR_T r,
644	   NCURSES_COLOR_T g,
645	   NCURSES_COLOR_T b)
646{
647    return NCURSES_SP_NAME(init_color) (CURRENT_SCREEN, color, r, g, b);
648}
649#endif
650
651NCURSES_EXPORT(bool)
652NCURSES_SP_NAME(can_change_color) (NCURSES_SP_DCL)
653{
654    int result = FALSE;
655
656    T((T_CALLED("can_change_color(%p)"), (void *) SP_PARM));
657
658    if (HasTerminal(SP_PARM) && (CanChange != 0)) {
659	result = TRUE;
660    }
661
662    returnCode(result);
663}
664
665#if NCURSES_SP_FUNCS
666NCURSES_EXPORT(bool)
667can_change_color(void)
668{
669    return NCURSES_SP_NAME(can_change_color) (CURRENT_SCREEN);
670}
671#endif
672
673NCURSES_EXPORT(bool)
674NCURSES_SP_NAME(has_colors) (NCURSES_SP_DCL0)
675{
676    int code = FALSE;
677
678    (void) SP_PARM;
679    T((T_CALLED("has_colors()")));
680    if (HasTerminal(SP_PARM)) {
681#ifdef USE_TERM_DRIVER
682	code = HasColor;
683#else
684	code = ((VALID_NUMERIC(max_colors) && VALID_NUMERIC(max_pairs)
685		 && (((set_foreground != NULL)
686		      && (set_background != NULL))
687		     || ((set_a_foreground != NULL)
688			 && (set_a_background != NULL))
689		     || set_color_pair)) ? TRUE : FALSE);
690#endif
691    }
692    returnCode(code);
693}
694
695#if NCURSES_SP_FUNCS
696NCURSES_EXPORT(bool)
697has_colors(void)
698{
699    return NCURSES_SP_NAME(has_colors) (CURRENT_SCREEN);
700}
701#endif
702
703NCURSES_EXPORT(int)
704NCURSES_SP_NAME(color_content) (NCURSES_SP_DCLx
705				NCURSES_COLOR_T color,
706				NCURSES_COLOR_T *r,
707				NCURSES_COLOR_T *g,
708				NCURSES_COLOR_T *b)
709{
710    int result = ERR;
711    int maxcolors;
712
713    T((T_CALLED("color_content(%p,%d,%p,%p,%p)"),
714       (void *) SP_PARM,
715       color,
716       (void *) r,
717       (void *) g,
718       (void *) b));
719
720    if (SP_PARM == 0)
721	returnCode(result);
722
723    maxcolors = MaxColors;
724
725    if (color < 0 || !OkColorHi(color) || !SP_PARM->_coloron) {
726	result = ERR;
727    } else {
728	NCURSES_COLOR_T c_r = SP_PARM->_color_table[color].red;
729	NCURSES_COLOR_T c_g = SP_PARM->_color_table[color].green;
730	NCURSES_COLOR_T c_b = SP_PARM->_color_table[color].blue;
731
732	if (r)
733	    *r = c_r;
734	if (g)
735	    *g = c_g;
736	if (b)
737	    *b = c_b;
738
739	TR(TRACE_ATTRS, ("...color_content(%d,%d,%d,%d)",
740			 color, c_r, c_g, c_b));
741	result = OK;
742    }
743    returnCode(result);
744}
745
746#if NCURSES_SP_FUNCS
747NCURSES_EXPORT(int)
748color_content(NCURSES_COLOR_T color,
749	      NCURSES_COLOR_T *r,
750	      NCURSES_COLOR_T *g,
751	      NCURSES_COLOR_T *b)
752{
753    return NCURSES_SP_NAME(color_content) (CURRENT_SCREEN, color, r, g, b);
754}
755#endif
756
757NCURSES_EXPORT(int)
758NCURSES_SP_NAME(pair_content) (NCURSES_SP_DCLx
759			       NCURSES_PAIRS_T pair,
760			       NCURSES_COLOR_T *f,
761			       NCURSES_COLOR_T *b)
762{
763    int result;
764
765    T((T_CALLED("pair_content(%p,%d,%p,%p)"),
766       (void *) SP_PARM,
767       (int) pair,
768       (void *) f,
769       (void *) b));
770
771    if (!ValidPair(pair)) {
772	result = ERR;
773    } else {
774	NCURSES_COLOR_T fg = (NCURSES_COLOR_T) FORE_OF(SP_PARM->_color_pairs[pair]);
775	NCURSES_COLOR_T bg = (NCURSES_COLOR_T) BACK_OF(SP_PARM->_color_pairs[pair]);
776
777#if NCURSES_EXT_FUNCS
778	if (fg == COLOR_DEFAULT)
779	    fg = -1;
780	if (bg == COLOR_DEFAULT)
781	    bg = -1;
782#endif
783
784	if (f)
785	    *f = fg;
786	if (b)
787	    *b = bg;
788
789	TR(TRACE_ATTRS, ("...pair_content(%p,%d,%d,%d)",
790			 (void *) SP_PARM,
791			 (int) pair,
792			 (int) fg, (int) bg));
793	result = OK;
794    }
795    returnCode(result);
796}
797
798#if NCURSES_SP_FUNCS
799NCURSES_EXPORT(int)
800pair_content(NCURSES_COLOR_T pair, NCURSES_COLOR_T *f, NCURSES_COLOR_T *b)
801{
802    return NCURSES_SP_NAME(pair_content) (CURRENT_SCREEN, pair, f, b);
803}
804#endif
805
806NCURSES_EXPORT(void)
807NCURSES_SP_NAME(_nc_do_color) (NCURSES_SP_DCLx
808			       int old_pair,
809			       int pair,
810			       int reverse,
811			       NCURSES_SP_OUTC outc)
812{
813#ifdef USE_TERM_DRIVER
814    CallDriver_4(SP_PARM, docolor, old_pair, pair, reverse, outc);
815#else
816    NCURSES_COLOR_T fg = COLOR_DEFAULT;
817    NCURSES_COLOR_T bg = COLOR_DEFAULT;
818    NCURSES_COLOR_T old_fg = -1;
819    NCURSES_COLOR_T old_bg = -1;
820
821    if (!ValidPair(pair)) {
822	return;
823    } else if (pair != 0) {
824	if (set_color_pair) {
825	    TPUTS_TRACE("set_color_pair");
826	    NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx
827				    TPARM_1(set_color_pair, pair),
828				    1, outc);
829	    return;
830	} else if (SP_PARM != 0) {
831	    if (pair_content((NCURSES_COLOR_T) pair, &fg, &bg) == ERR)
832		return;
833	}
834    }
835
836    if (old_pair >= 0
837	&& SP_PARM != 0
838	&& pair_content((NCURSES_COLOR_T) old_pair, &old_fg, &old_bg) != ERR) {
839	if ((isDefaultColor(fg) && !isDefaultColor(old_fg))
840	    || (isDefaultColor(bg) && !isDefaultColor(old_bg))) {
841#if NCURSES_EXT_FUNCS
842	    /*
843	     * A minor optimization - but extension.  If "AX" is specified in
844	     * the terminal description, treat it as screen's indicator of ECMA
845	     * SGR 39 and SGR 49, and assume the two sequences are independent.
846	     */
847	    if (SP_PARM->_has_sgr_39_49
848		&& isDefaultColor(old_bg)
849		&& !isDefaultColor(old_fg)) {
850		NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx "\033[39m", 1, outc);
851	    } else if (SP_PARM->_has_sgr_39_49
852		       && isDefaultColor(old_fg)
853		       && !isDefaultColor(old_bg)) {
854		NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx "\033[49m", 1, outc);
855	    } else
856#endif
857		reset_color_pair(NCURSES_SP_ARG);
858	}
859    } else {
860	reset_color_pair(NCURSES_SP_ARG);
861	if (old_pair < 0)
862	    return;
863    }
864
865#if NCURSES_EXT_FUNCS
866    if (isDefaultColor(fg))
867	fg = (NCURSES_COLOR_T) default_fg(NCURSES_SP_ARG);
868    if (isDefaultColor(bg))
869	bg = (NCURSES_COLOR_T) default_bg(NCURSES_SP_ARG);
870#endif
871
872    if (reverse) {
873	NCURSES_COLOR_T xx = fg;
874	fg = bg;
875	bg = xx;
876    }
877
878    TR(TRACE_ATTRS, ("setting colors: pair = %d, fg = %d, bg = %d", pair,
879		     fg, bg));
880
881    if (!isDefaultColor(fg)) {
882	set_foreground_color(NCURSES_SP_ARGx fg, outc);
883    }
884    if (!isDefaultColor(bg)) {
885	set_background_color(NCURSES_SP_ARGx bg, outc);
886    }
887#endif
888}
889
890#if NCURSES_SP_FUNCS
891NCURSES_EXPORT(void)
892_nc_do_color(int old_pair, int pair, int reverse, NCURSES_OUTC outc)
893{
894    SetSafeOutcWrapper(outc);
895    NCURSES_SP_NAME(_nc_do_color) (CURRENT_SCREEN,
896				   old_pair,
897				   pair,
898				   reverse,
899				   _nc_outc_wrapper);
900}
901#endif
902