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/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
/* lib_color.c
*
* Handles color emulation of SYS V curses
*
*/
#include "curses.priv.h"
#include <stdlib.h>
#include <string.h>
#include "term.h"
int COLOR_PAIRS;
int COLORS;
unsigned char *color_pairs;
typedef struct
{
short red, green, blue;
}
color_t;
static color_t *color_table;
static const color_t cga_palette[] =
{
/* R G B */
{0, 0, 0}, /* COLOR_BLACK */
{1000, 0, 0}, /* COLOR_RED */
{0, 1000, 0}, /* COLOR_GREEN */
{1000, 1000, 0}, /* COLOR_YELLOW */
{0, 0, 1000}, /* COLOR_BLUE */
{1000, 0, 1000}, /* COLOR_MAGENTA */
{0, 1000, 1000}, /* COLOR_CYAN */
{1000, 1000, 1000}, /* COLOR_WHITE */
};
static const color_t hls_palette[] =
{
/* H L S */
{0, 0, 0}, /* COLOR_BLACK */
{120, 50, 100}, /* COLOR_RED */
{240, 50, 100}, /* COLOR_GREEN */
{180, 50, 100}, /* COLOR_YELLOW */
{330, 50, 100}, /* COLOR_BLUE */
{60, 50, 100}, /* COLOR_MAGENTA */
{300, 50, 100}, /* COLOR_CYAN */
{0, 50, 100}, /* COLOR_WHITE */
};
int start_color(void)
{
T(("start_color() called."));
#ifdef orig_pair
if (orig_pair != NULL)
{
TPUTS_TRACE("orig_pair");
putp(orig_pair);
}
#endif /* orig_pair */
#ifdef orig_colors
if (orig_colors != NULL)
{
TPUTS_TRACE("orig_colors");
putp(orig_colors);
}
#endif /* orig_colors */
#if defined(orig_pair) && defined(orig_colors)
if (!orig_pair && !orig_colors)
return ERR;
#endif /* defined(orig_pair) && defined(orig_colors) */
if (max_pairs != -1)
COLOR_PAIRS = max_pairs;
else
return ERR;
color_pairs = calloc((unsigned int)max_pairs, sizeof(char));
if (max_colors != -1)
COLORS = max_colors;
else
return ERR;
SP->_coloron = 1;
#ifdef hue_lightness_saturation
color_table = malloc(sizeof(color_t) * COLORS);
if (hue_lightness_saturation)
memcpy(color_table, hls_palette, sizeof(color_t) * COLORS);
else
#endif /* hue_lightness_saturation */
memcpy(color_table, cga_palette, sizeof(color_t) * COLORS);
if (orig_colors)
{
TPUTS_TRACE("orig_colors");
putp(orig_colors);
}
T(("started color: COLORS = %d, COLOR_PAIRS = %d", COLORS, COLOR_PAIRS));
return OK;
}
#ifdef hue_lightness_saturation
static void rgb2hls(short r, short g, short b, short *h, short *l, short *s)
/* convert RGB to HLS system */
{
short min, max, t;
if ((min = g < r ? g : r) > b) min = b;
if ((max = g > r ? g : r) < b) max = b;
/* calculate lightness */
*l = (min + max) / 20;
if (min == max) /* black, white and all shades of gray */
{
*h = 0;
*s = 0;
return;
}
/* calculate saturation */
if (*l < 50)
*s = ((max - min) * 100) / (max + min);
else *s = ((max - min) * 100) / (2000 - max - min);
/* calculate hue */
if (r == max)
t = 120 + ((g - b) * 60) / (max - min);
else
if (g == max)
t = 240 + ((b - r) * 60) / (max - min);
else
t = 360 + ((r - g) * 60) / (max - min);
*h = t % 360;
}
#endif /* hue_lightness_saturation */
int init_pair(short pair, short f, short b)
{
T(("init_pair( %d, %d, %d )", pair, f, b));
if ((pair < 1) || (pair >= COLOR_PAIRS))
return ERR;
if ((f < 0) || (f >= COLORS) || (b < 0) || (b >= COLORS))
return ERR;
/*
* FIXME: when a pair's content is changed, replace its colors
* (if pair was initialized before a screen update is performed
* replacing original pair colors with the new ones)
*/
color_pairs[pair] = ( (f & 0x0f) | (b & 0x0f) << 4 );
if (initialize_pair)
{
const color_t *tp = hue_lightness_saturation ? hls_palette : cga_palette;
T(("initializing pair: pair = %d, fg=(%d,%d,%d), bg=(%d,%d,%d)\n",
pair,
tp[f].red, tp[f].green, tp[f].blue,
tp[b].red, tp[b].green, tp[b].blue));
if (initialize_pair)
{
TPUTS_TRACE("initialize_pair");
putp(tparm(initialize_pair,
pair,
tp[f].red, tp[f].green, tp[f].blue,
tp[b].red, tp[b].green, tp[b].blue));
}
}
return OK;
}
int init_color(short color, short r, short g, short b)
{
#ifdef initialize_color
if (initialize_color == NULL)
return ERR;
#endif /* initialize_color */
if (color < 0 || color >= COLORS)
return ERR;
#ifdef hue_lightness_saturation
if (hue_lightness_saturation == TRUE)
if (r < 0 || r > 360 || g < 0 || g > 100 || b < 0 || b > 100)
return ERR;
if (hue_lightness_saturation == FALSE)
#endif /* hue_lightness_saturation */
if (r < 0 || r > 1000 || g < 0 || g > 1000 || b < 0 || b > 1000)
return ERR;
#ifdef hue_lightness_saturation
if (hue_lightness_saturation)
rgb2hls(r, g, b,
&color_table[color].red,
&color_table[color].green,
&color_table[color].blue);
else
#endif /* hue_lightness_saturation */
{
color_table[color].red = r;
color_table[color].green = g;
color_table[color].blue = b;
}
#ifdef initialize_color
if (initialize_color)
{
TPUTS_TRACE("initialize_color");
putp(tparm(initialize_color, color, r, g, b));
}
#endif /* initialize_color */
return OK;
}
bool can_change_color(void)
{
return (can_change != 0);
}
int has_colors(void)
{
return ((orig_pair != NULL || orig_colors != NULL)
&& (max_colors != -1) && (max_pairs != -1)
&&
(((set_foreground != NULL) && (set_background != NULL))
|| ((set_a_foreground != NULL) && (set_a_background != NULL))
|| set_color_pair)
);
}
int color_content(short color, short *r, short *g, short *b)
{
if (color < 0 || color > COLORS)
return ERR;
*r = color_table[color].red;
*g = color_table[color].green;
*b = color_table[color].blue;
return OK;
}
int pair_content(short pair, short *f, short *b)
{
if ((pair < 1) || (pair > COLOR_PAIRS))
return ERR;
*f = color_pairs[pair] & 0x0f;
*b = color_pairs[pair] & 0xf0;
*b >>= 4;
return OK;
}
void _nc_do_color(int pair, int (*outc)(int))
{
short fg, bg;
if (pair == 0)
{
if (orig_pair)
{
TPUTS_TRACE("orig_pair");
tputs(orig_pair, 1, outc);
}
}
else
{
if (set_color_pair)
{
TPUTS_TRACE("set_color_pair");
tputs(tparm(set_color_pair, pair), 1, outc);
}
else
{
pair_content(pair, &fg, &bg);
T(("setting colors: pair = %d, fg = %d, bg = %d\n", pair, fg, bg));
if (set_a_foreground)
{
TPUTS_TRACE("set_a_foreground");
tputs(tparm(set_a_foreground, fg), 1, outc);
}
else
{
TPUTS_TRACE("set_foreground");
tputs(tparm(set_foreground, fg), 1, outc);
}
if (set_a_background)
{
TPUTS_TRACE("set_a_background");
tputs(tparm(set_a_background, bg), 1, outc);
}
else
{
TPUTS_TRACE("set_background");
tputs(tparm(set_background, bg), 1, outc);
}
}
}
}
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