/*	$NetBSD: color.c,v 1.49 2026/07/19 06:39:04 blymn Exp $	*/

/*
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Julian Coleman.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: color.c,v 1.49 2026/07/19 06:39:04 blymn Exp $");
#endif				/* not lint */

#include "curses.h"
#include "curses_private.h"

/* Have we initialised colours? */
int	__using_color = 0;
int	__do_color_init = 0; /* force refresh to init color in all cells */

/* Default colour number */
attr_t	__default_color = 0;

/* Default colour pair values - white on black. */
struct __pair	__default_pair = {COLOR_WHITE, COLOR_BLACK, 0};

/* Default colour values */
/* Flags for colours and pairs */
#define	__USED		0x01

static void
__change_pair(short);

static int
init_color_value(short, short, short, short);

/*
 * has_colors --
 *	Check if terminal has colours.
 */
bool
has_colors(void)
{
	if (max_colors > 0 && max_pairs > 0 &&
	    ((set_a_foreground != NULL && set_a_background != NULL) ||
		initialize_pair != NULL || initialize_color != NULL ||
		(set_background != NULL && set_foreground != NULL)))
		return true;
	else
		return false;
}

/*
 * can_change_color --
 *	Check if terminal can change colours.
 */
bool
can_change_color(void)
{
	return can_change ? true : false;
}

/*
 * start_color --
 *	Initialise colour support.
 */
int
start_color(void)
{
	int			 i;
	attr_t			 temp_nc;
	struct __winlist	*wlp;
	WINDOW			*win;
	int			 y, x;

	if (has_colors() == FALSE)
		return ERR;

	/* Max colours and colour pairs */
	if (max_colors == -1)
		COLORS = 0;
	else {
		COLORS = max_colors > MAX_COLORS ? MAX_COLORS : max_colors;
		if (max_pairs == -1) {
			COLOR_PAIRS = 0;
			COLORS = 0;
		} else {
			COLOR_PAIRS = (max_pairs > MAX_PAIRS - 1 ?
			    MAX_PAIRS - 1 : max_pairs);
			 /* Use the last colour pair for curses default. */
#ifdef __OLD_DEFAULT_COLOR
			__default_color = COLOR_PAIR(MAX_PAIRS - 1);
#else
			__default_color = COLOR_PAIR(0);
#endif
		}
	}
	if (!COLORS)
		return ERR;

	_cursesi_screen->COLORS = COLORS;
	_cursesi_screen->COLOR_PAIRS = COLOR_PAIRS;
	_cursesi_screen->curpair = -1;

	/* Reset terminal colour and colour pairs. */
	if (orig_colors != NULL)
		tputs(orig_colors, 0, __cputchar);
	if (orig_pair != NULL) {
		tputs(orig_pair, 0, __cputchar);
		curscr->wattr &= _cursesi_screen->mask_op;
	}

	/* Type of colour manipulation - ANSI/TEK/HP/other */
	if (set_a_foreground != NULL && set_a_background != NULL)
		_cursesi_screen->color_type = COLOR_ANSI;
	else if (initialize_pair != NULL)
		_cursesi_screen->color_type = COLOR_HP;
	else if (initialize_color != NULL)
		_cursesi_screen->color_type = COLOR_TEK;
	else if (set_foreground != NULL && set_background != NULL)
		_cursesi_screen->color_type = COLOR_OTHER;
	else
		return(ERR);		/* Unsupported colour method */

#ifdef DEBUG
	__CTRACE(__CTRACE_COLOR, "start_color: COLORS = %d, COLOR_PAIRS = %d",
	    COLORS, COLOR_PAIRS);
	switch (_cursesi_screen->color_type) {
	case COLOR_ANSI:
		__CTRACE(__CTRACE_COLOR, " (ANSI style)\n");
		break;
	case COLOR_HP:
		__CTRACE(__CTRACE_COLOR, " (HP style)\n");
		break;
	case COLOR_TEK:
		__CTRACE(__CTRACE_COLOR, " (Tektronics style)\n");
		break;
	case COLOR_OTHER:
		__CTRACE(__CTRACE_COLOR, " (Other style)\n");
		break;
	}
#endif

	/*
	 * Attributes that cannot be used with color.
	 * Store these in an attr_t for wattrset()/wattron().
	 */
	_cursesi_screen->nca = __NORMAL;
	if (no_color_video != -1) {
		temp_nc = (attr_t)t_no_color_video(_cursesi_screen->term);
		if (temp_nc & 0x0001)
			_cursesi_screen->nca |= __STANDOUT;
		if (temp_nc & 0x0002)
			_cursesi_screen->nca |= __UNDERSCORE;
		if (temp_nc & 0x0004)
			_cursesi_screen->nca |= __REVERSE;
		if (temp_nc & 0x0008)
			_cursesi_screen->nca |= __BLINK;
		if (temp_nc & 0x0010)
			_cursesi_screen->nca |= __DIM;
		if (temp_nc & 0x0020)
			_cursesi_screen->nca |= __BOLD;
		if (temp_nc & 0x0040)
			_cursesi_screen->nca |= __BLANK;
		if (temp_nc & 0x0080)
			_cursesi_screen->nca |= __PROTECT;
		if (temp_nc & 0x0100)
			_cursesi_screen->nca |= __ALTCHARSET;
	}
	__CTRACE(__CTRACE_COLOR, "start_color: _cursesi_screen->nca = %08x\n",
	    _cursesi_screen->nca);

	/* Set up initial 8 colours */
#define	RGB_ON	680	/* Allow for bright colours */
	if (COLORS >= COLOR_BLACK)
		(void)init_color_value(COLOR_BLACK, 0, 0, 0);
	if (COLORS >= COLOR_RED)
		(void)init_color_value(COLOR_RED, RGB_ON, 0, 0);
	if (COLORS >= COLOR_GREEN)
		(void)init_color_value(COLOR_GREEN, 0, RGB_ON, 0);
	if (COLORS >= COLOR_YELLOW)
		(void)init_color_value(COLOR_YELLOW, RGB_ON, RGB_ON, 0);
	if (COLORS >= COLOR_BLUE)
		(void)init_color_value(COLOR_BLUE, 0, 0, RGB_ON);
	if (COLORS >= COLOR_MAGENTA)
		(void)init_color_value(COLOR_MAGENTA, RGB_ON, 0, RGB_ON);
	if (COLORS >= COLOR_CYAN)
		(void)init_color_value(COLOR_CYAN, 0, RGB_ON, RGB_ON);
	if (COLORS >= COLOR_WHITE)
		(void)init_color_value(COLOR_WHITE, RGB_ON, RGB_ON, RGB_ON);

	/* Initialise other colours */
	for (i = 8; i < COLORS; i++) {
		_cursesi_screen->colours[i].red = 0;
		_cursesi_screen->colours[i].green = 0;
		_cursesi_screen->colours[i].blue = 0;
		_cursesi_screen->colours[i].flags = 0;
	}

	/* Initialise pair 0 to default colours. */
	_cursesi_screen->colour_pairs[0].fore = -1;
	_cursesi_screen->colour_pairs[0].back = -1;
	_cursesi_screen->colour_pairs[0].flags = 0;

	/* Initialise user colour pairs to default (white on black) */
	for (i = 0; i < COLOR_PAIRS; i++) {
		_cursesi_screen->colour_pairs[i].fore = COLOR_WHITE;
		_cursesi_screen->colour_pairs[i].back = COLOR_BLACK;
		_cursesi_screen->colour_pairs[i].flags = 0;
	}

	/* Initialise default colour pair. */
	_cursesi_screen->colour_pairs[PAIR_NUMBER(__default_color)].fore =
	    __default_pair.fore;
	_cursesi_screen->colour_pairs[PAIR_NUMBER(__default_color)].back =
	    __default_pair.back;
	_cursesi_screen->colour_pairs[PAIR_NUMBER(__default_color)].flags =
	    __default_pair.flags;

	__using_color = 1;
	__do_color_init = 1;

	/* Set all positions on all windows to curses default colours. */
	for (wlp = _cursesi_screen->winlistp; wlp != NULL; wlp = wlp->nextp) {
		win = wlp->winp;
		if (wlp->winp != __virtscr && wlp->winp != curscr) {
			/* Set color attribute on other windows */
			win->battr |= __default_color;
			for (y = 0; y < win->maxy; y++) {
				win->alines[y]->flags |= __ISFORCED;
				for (x = 0; x < win->maxx; x++) {
					win->alines[y]->line[x].attr &= ~__COLOR;
					win->alines[y]->line[x].attr |= __default_color;
				}
			}
			__touchwin(win, 0);
		}
	}

	return(OK);
}

/*
 * init_pair --
 *	Set pair foreground and background colors.
 *	Our default colour ordering is ANSI - 1 = red, 4 = blue, 3 = yellow,
 *	6 = cyan.  The older style (Sb/Sf) uses 1 = blue, 4 = red, 3 = cyan,
 *	6 = yellow, so we swap them here and in pair_content().
 */
int
init_pair(short pair, short fore, short back)
{
	int	changed;

	__CTRACE(__CTRACE_COLOR, "init_pair: %d, %d, %d\n", pair, fore, back);

	if (pair < 0 || pair >= COLOR_PAIRS)
		return ERR;

	if (pair == 0) /* Ignore request for pair 0, it is default. */
		return OK;

	if (fore >= COLORS)
		return ERR;
	if (back >= COLORS)
		return ERR;

	/* Swap red/blue and yellow/cyan */
	if (_cursesi_screen->color_type == COLOR_OTHER) {
		switch (fore) {
		case COLOR_RED:
			fore = COLOR_BLUE;
			break;
		case COLOR_BLUE:
			fore = COLOR_RED;
			break;
		case COLOR_YELLOW:
			fore = COLOR_CYAN;
			break;
		case COLOR_CYAN:
			fore = COLOR_YELLOW;
			break;
		}
		switch (back) {
		case COLOR_RED:
			back = COLOR_BLUE;
			break;
		case COLOR_BLUE:
			back = COLOR_RED;
			break;
		case COLOR_YELLOW:
			back = COLOR_CYAN;
			break;
		case COLOR_CYAN:
			back = COLOR_YELLOW;
			break;
		}
	}

	if ((_cursesi_screen->colour_pairs[pair].flags & __USED) &&
	    (fore != _cursesi_screen->colour_pairs[pair].fore ||
	     back != _cursesi_screen->colour_pairs[pair].back))
		changed = 1;
	else
		changed = 0;

	_cursesi_screen->colour_pairs[pair].flags |= __USED;
	_cursesi_screen->colour_pairs[pair].fore = fore;
	_cursesi_screen->colour_pairs[pair].back = back;

	/* XXX: need to initialise HP style (Ip) */

	if (changed)
		__change_pair(pair);
	return OK;
}

/*
 * pair_content --
 *	Get pair foreground and background colours.
 */
int
pair_content(short pair, short *forep, short *backp)
{
	if (pair < 0 || pair > _cursesi_screen->COLOR_PAIRS)
		return ERR;

	*forep = _cursesi_screen->colour_pairs[pair].fore;
	*backp = _cursesi_screen->colour_pairs[pair].back;

	/* Swap red/blue and yellow/cyan */
	if (_cursesi_screen->color_type == COLOR_OTHER) {
		switch (*forep) {
		case COLOR_RED:
			*forep = COLOR_BLUE;
			break;
		case COLOR_BLUE:
			*forep = COLOR_RED;
			break;
		case COLOR_YELLOW:
			*forep = COLOR_CYAN;
			break;
		case COLOR_CYAN:
			*forep = COLOR_YELLOW;
			break;
		}
		switch (*backp) {
		case COLOR_RED:
			*backp = COLOR_BLUE;
			break;
		case COLOR_BLUE:
			*backp = COLOR_RED;
			break;
		case COLOR_YELLOW:
			*backp = COLOR_CYAN;
			break;
		case COLOR_CYAN:
			*backp = COLOR_YELLOW;
			break;
		}
	}
	return OK;
}

/*
 * init_color_Value --
 *	Set colour red, green and blue values.
 */
static int
init_color_value(short color, short red, short green, short blue)
{
	if (color < 0 || color >= _cursesi_screen->COLORS)
		return ERR;

	_cursesi_screen->colours[color].red = red;
	_cursesi_screen->colours[color].green = green;
	_cursesi_screen->colours[color].blue = blue;
	return OK;
}

/*
 * init_color --
 *	Set colour red, green and blue values.
 *	Change color on screen.
 */
int
init_color(short color, short red, short green, short blue)
{
	__CTRACE(__CTRACE_COLOR, "init_color: %d, %d, %d, %d\n",
	    color, red, green, blue);
	if (init_color_value(color, red, green, blue) == ERR)
		return ERR;
	if (!can_change || t_initialize_color(_cursesi_screen->term) == NULL)
		return ERR;
	tputs(tiparm(t_initialize_color(_cursesi_screen->term),
	             color, red, green, blue), 0, __cputchar);
	return OK;
}

/*
 * color_content --
 *	Get colour red, green and blue values.
 */
int
color_content(short color, short *redp, short *greenp, short *bluep)
{
	if (color < 0 || color >= _cursesi_screen->COLORS)
		return ERR;

	*redp = _cursesi_screen->colours[color].red;
	*greenp = _cursesi_screen->colours[color].green;
	*bluep = _cursesi_screen->colours[color].blue;
	return OK;
}

/*
 * use_default_colors --
 *	Use terminal default colours instead of curses default colour.
  */
int
use_default_colors(void)
{
	__CTRACE(__CTRACE_COLOR, "use_default_colors\n");

	return (assume_default_colors(-1, -1));
}

/*
 * assume_default_colors --
 *	Set the default foreground and background colours.
 */
int
assume_default_colors(short fore, short back)
{
	__CTRACE(__CTRACE_COLOR, "assume_default_colors: %d, %d\n",
	    fore, back);
	__CTRACE(__CTRACE_COLOR,
	    "assume_default_colors: default_colour = %d, pair_number = %d\n",
	    __default_color, PAIR_NUMBER(__default_color));

	/* Swap red/blue and yellow/cyan */
	if (_cursesi_screen->color_type == COLOR_OTHER) {
		switch (fore) {
		case COLOR_RED:
			fore = COLOR_BLUE;
			break;
		case COLOR_BLUE:
			fore = COLOR_RED;
			break;
		case COLOR_YELLOW:
			fore = COLOR_CYAN;
			break;
		case COLOR_CYAN:
			fore = COLOR_YELLOW;
			break;
		}
		switch (back) {
		case COLOR_RED:
			back = COLOR_BLUE;
			break;
		case COLOR_BLUE:
			back = COLOR_RED;
			break;
		case COLOR_YELLOW:
			back = COLOR_CYAN;
			break;
		case COLOR_CYAN:
			back = COLOR_YELLOW;
			break;
		}
	}
	__default_pair.fore = fore;
	__default_pair.back = back;
	__default_pair.flags = __USED;

	if (COLOR_PAIRS) {
		_cursesi_screen->colour_pairs[PAIR_NUMBER(__default_color)].fore = fore;
		_cursesi_screen->colour_pairs[PAIR_NUMBER(__default_color)].back = back;
		_cursesi_screen->colour_pairs[PAIR_NUMBER(__default_color)].flags = __USED;
	}

	/*
	 * If we've already called start_color(), make sure all instances
	 * of the curses default colour pair are dirty.
	 */
	if (__using_color)
		__change_pair(PAIR_NUMBER(__default_color));

	return(OK);
}

/* no_color_video is a terminfo macro, but we need to retain binary compat */
#ifdef __strong_alias
#undef no_color_video
__strong_alias(no_color_video, no_color_attributes)
#endif
/*
 * no_color_attributes --
 *	Return attributes that cannot be combined with color.
 */
attr_t
no_color_attributes(void)
{
	return(_cursesi_screen->nca);
}

/*
 * __set_color --
 *	Set terminal foreground and background colours.
 */
void
__set_color( /*ARGSUSED*/ WINDOW *win, attr_t attr)
{
	short	pair;

	if ((__do_color_init != 1) &&
	    ((curscr->wattr & __COLOR) == (attr & __COLOR)))
		return;

	pair = PAIR_NUMBER((uint32_t)attr);

	if (pair == _cursesi_screen->curpair)
		return;

	__CTRACE(__CTRACE_COLOR, "__set_color: %d, %d, %d\n", pair,
	    _cursesi_screen->colour_pairs[pair].fore,
	    _cursesi_screen->colour_pairs[pair].back);
	switch (_cursesi_screen->color_type) {
	/* Set ANSI foreground and background colours */
	case COLOR_ANSI:
		if (_cursesi_screen->colour_pairs[pair].fore < 0 ||
		    _cursesi_screen->colour_pairs[pair].back < 0)
			__unset_color(curscr);
		if (_cursesi_screen->colour_pairs[pair].fore >= 0)
			tputs(tiparm(t_set_a_foreground(_cursesi_screen->term),
			    (int)_cursesi_screen->colour_pairs[pair].fore),
			    0, __cputchar);
		if (_cursesi_screen->colour_pairs[pair].back >= 0)
			tputs(tiparm(t_set_a_background(_cursesi_screen->term),
			    (int)_cursesi_screen->colour_pairs[pair].back),
			    0, __cputchar);
		break;
	case COLOR_HP:
		/* XXX: need to support HP style */
		break;
	case COLOR_TEK:
		/* XXX: need to support Tek style */
		break;
	case COLOR_OTHER:
		if (_cursesi_screen->colour_pairs[pair].fore < 0 ||
		    _cursesi_screen->colour_pairs[pair].back < 0)
			__unset_color(curscr);
		if (_cursesi_screen->colour_pairs[pair].fore >= 0)
			tputs(tiparm(t_set_foreground(_cursesi_screen->term),
			    (int)_cursesi_screen->colour_pairs[pair].fore),
			    0, __cputchar);
		if (_cursesi_screen->colour_pairs[pair].back >= 0)
			tputs(tiparm(t_set_background(_cursesi_screen->term),
			    (int)_cursesi_screen->colour_pairs[pair].back),
			    0, __cputchar);
		break;
	}

	_cursesi_screen->curpair = pair;
	curscr->wattr &= ~__COLOR;
	curscr->wattr |= attr & __COLOR;
}

/*
 * __unset_color --
 *	Clear terminal foreground and background colours.
 */
void
__unset_color(WINDOW *win)
{
	__CTRACE(__CTRACE_COLOR, "__unset_color\n");
	switch (_cursesi_screen->color_type) {
	/* Clear ANSI foreground and background colours */
	case COLOR_ANSI:
		if (orig_pair != NULL) {
			tputs(orig_pair, 0, __cputchar);
			win->wattr &= __mask_op;
			curscr->wattr &= __mask_op;
		}
		break;
	case COLOR_HP:
		/* XXX: need to support HP style */
		break;
	case COLOR_TEK:
		/* XXX: need to support Tek style */
		break;
	case COLOR_OTHER:
		if (orig_pair != NULL) {
			tputs(orig_pair, 0, __cputchar);
			win->wattr &= __mask_op;
		}
		break;
	}

	_cursesi_screen->curpair = -1;
}

/*
 * __restore_colors --
 *	Redo color definitions after restarting 'curses' mode.
 */
void
__restore_colors(void)
{
	/*
	 * forget foreground/background colour just in case it was
	 * changed.  We will reset them if required.
	 */
	_cursesi_screen->curpair = -1;

	if (can_change != 0)
		switch (_cursesi_screen->color_type) {
		case COLOR_HP:
			/* XXX: need to re-initialise HP style (Ip) */
			break;
		case COLOR_TEK:
			/* XXX: need to re-initialise Tek style (Ic) */
			break;
		}
}

/*
 * __change_pair --
 *	Mark dirty all positions using pair.
 */
void
__change_pair(short pair)
{
	struct __winlist	*wlp;
	WINDOW			*win;
	int			 y, x;
	__LINE			*lp;
	uint32_t		cl = COLOR_PAIR(pair);


	for (wlp = _cursesi_screen->winlistp; wlp != NULL; wlp = wlp->nextp) {
		__CTRACE(__CTRACE_COLOR, "__change_pair: win = %p\n",
		    wlp->winp);
		win = wlp->winp;
		if (win == __virtscr)
			continue;
		else if (win == curscr) {
			/* Reset colour attribute on curscr */
			__CTRACE(__CTRACE_COLOR,
			    "__change_pair: win == curscr\n");
			for (y = 0; y < curscr->maxy; y++) {
				lp = curscr->alines[y];
				for (x = 0; x < curscr->maxx; x++) {
					if ((lp->line[x].attr & __COLOR) == cl)
						lp->line[x].attr &= ~__COLOR;
				}
			}
		} /*  Disable dirtying the window on colour change as it
			dirties stdscr and if stdscr is not being used then
			it causes the screen to blank - apps don't need to
			write to stdscr, they can use windows on top so it
			is easy for stdscr to be blank which stomps the other
			windows.  XXXX remove this later pending no issues XXX
			else {
			* Mark dirty those positions with colour pair "pair" *
			for (y = 0; y < win->maxy; y++) {
				lp = win->alines[y];
				for (x = 0; x < win->maxx; x++)
					if ((lp->line[x].attr &
					    __COLOR) == cl) {
						if (!(lp->flags & __ISDIRTY))
							lp->flags |= __ISDIRTY;
						*
						 * firstchp/lastchp are shared
						 * between parent window and
						 * sub-window.
						 *
						if (*lp->firstchp > x)
							*lp->firstchp = x;

						if (*lp->lastchp < x)
							*lp->lastchp = x;
					}
#ifdef DEBUG
				if ((win->alines[y]->flags & __ISDIRTY))
					__CTRACE(__CTRACE_COLOR,
					    "__change_pair: first = %d, "
					    "last = %d\n",
					    *win->alines[y]->firstchp,
					    *win->alines[y]->lastchp);
#endif
			}
		}*/
	}
}