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+/****************************************************************************
+ * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
+ * and: Eric S. Raymond <esr@snark.thyrsus.com> *
+ * and: Thomas E. Dickey 1996-on *
+ ****************************************************************************/
+
+/* lib_color.c
+ *
+ * Handles color emulation of SYS V curses
+ */
+
+#include <curses.priv.h>
+
+#include <term.h>
+#include <tic.h>
+
+MODULE_ID("$Id: lib_color.c,v 1.85 2007/04/07 17:07:28 tom Exp $")
+
+/*
+ * These should be screen structure members. They need to be globals for
+ * historical reasons. So we assign them in start_color() and also in
+ * set_term()'s screen-switching logic.
+ */
+#if USE_REENTRANT
+NCURSES_EXPORT(int)
+NCURSES_PUBLIC_VAR(COLOR_PAIRS) (void)
+{
+ return SP ? SP->_pair_count : -1;
+}
+NCURSES_EXPORT(int)
+NCURSES_PUBLIC_VAR(COLORS) (void)
+{
+ return SP ? SP->_color_count : -1;
+}
+#else
+NCURSES_EXPORT_VAR(int) COLOR_PAIRS = 0;
+NCURSES_EXPORT_VAR(int) COLORS = 0;
+#endif
+
+#define DATA(r,g,b) {r,g,b, 0,0,0, 0}
+
+#define TYPE_CALLOC(type,elts) typeCalloc(type, (unsigned)(elts))
+
+#define MAX_PALETTE 8
+
+#define OkColorHi(n) (((n) < COLORS) && ((n) < max_colors))
+#define InPalette(n) ((n) >= 0 && (n) < MAX_PALETTE)
+
+/*
+ * Given a RGB range of 0..1000, we'll normally set the individual values
+ * to about 2/3 of the maximum, leaving full-range for bold/bright colors.
+ */
+#define RGB_ON 680
+#define RGB_OFF 0
+/* *INDENT-OFF* */
+static const color_t cga_palette[] =
+{
+ /* R G B */
+ DATA(RGB_OFF, RGB_OFF, RGB_OFF), /* COLOR_BLACK */
+ DATA(RGB_ON, RGB_OFF, RGB_OFF), /* COLOR_RED */
+ DATA(RGB_OFF, RGB_ON, RGB_OFF), /* COLOR_GREEN */
+ DATA(RGB_ON, RGB_ON, RGB_OFF), /* COLOR_YELLOW */
+ DATA(RGB_OFF, RGB_OFF, RGB_ON), /* COLOR_BLUE */
+ DATA(RGB_ON, RGB_OFF, RGB_ON), /* COLOR_MAGENTA */
+ DATA(RGB_OFF, RGB_ON, RGB_ON), /* COLOR_CYAN */
+ DATA(RGB_ON, RGB_ON, RGB_ON), /* COLOR_WHITE */
+};
+
+static const color_t hls_palette[] =
+{
+ /* H L S */
+ DATA( 0, 0, 0), /* COLOR_BLACK */
+ DATA( 120, 50, 100), /* COLOR_RED */
+ DATA( 240, 50, 100), /* COLOR_GREEN */
+ DATA( 180, 50, 100), /* COLOR_YELLOW */
+ DATA( 330, 50, 100), /* COLOR_BLUE */
+ DATA( 60, 50, 100), /* COLOR_MAGENTA */
+ DATA( 300, 50, 100), /* COLOR_CYAN */
+ DATA( 0, 50, 100), /* COLOR_WHITE */
+};
+/* *INDENT-ON* */
+
+#if NCURSES_EXT_FUNCS
+/*
+ * These are called from _nc_do_color(), which in turn is called from
+ * vidattr - so we have to assume that SP may be null.
+ */
+static int
+default_fg(void)
+{
+ return (SP != 0) ? SP->_default_fg : COLOR_WHITE;
+}
+
+static int
+default_bg(void)
+{
+ return SP != 0 ? SP->_default_bg : COLOR_BLACK;
+}
+#else
+#define default_fg() COLOR_WHITE
+#define default_bg() COLOR_BLACK
+#endif
+
+/*
+ * SVr4 curses is known to interchange color codes (1,4) and (3,6), possibly
+ * to maintain compatibility with a pre-ANSI scheme. The same scheme is
+ * also used in the FreeBSD syscons.
+ */
+static int
+toggled_colors(int c)
+{
+ if (c < 16) {
+ static const int table[] =
+ {0, 4, 2, 6, 1, 5, 3, 7,
+ 8, 12, 10, 14, 9, 13, 11, 15};
+ c = table[c];
+ }
+ return c;
+}
+
+static void
+set_background_color(int bg, int (*outc) (int))
+{
+ if (set_a_background) {
+ TPUTS_TRACE("set_a_background");
+ tputs(TPARM_1(set_a_background, bg), 1, outc);
+ } else {
+ TPUTS_TRACE("set_background");
+ tputs(TPARM_1(set_background, toggled_colors(bg)), 1, outc);
+ }
+}
+
+static void
+set_foreground_color(int fg, int (*outc) (int))
+{
+ if (set_a_foreground) {
+ TPUTS_TRACE("set_a_foreground");
+ tputs(TPARM_1(set_a_foreground, fg), 1, outc);
+ } else {
+ TPUTS_TRACE("set_foreground");
+ tputs(TPARM_1(set_foreground, toggled_colors(fg)), 1, outc);
+ }
+}
+
+static void
+init_color_table(void)
+{
+ const color_t *tp;
+ int n;
+
+ tp = (hue_lightness_saturation) ? hls_palette : cga_palette;
+ for (n = 0; n < COLORS; n++) {
+ if (InPalette(n)) {
+ SP->_color_table[n] = tp[n];
+ } else {
+ SP->_color_table[n] = tp[n % MAX_PALETTE];
+ if (hue_lightness_saturation) {
+ SP->_color_table[n].green = 100;
+ } else {
+ if (SP->_color_table[n].red)
+ SP->_color_table[n].red = 1000;
+ if (SP->_color_table[n].green)
+ SP->_color_table[n].green = 1000;
+ if (SP->_color_table[n].blue)
+ SP->_color_table[n].blue = 1000;
+ }
+ }
+ }
+}
+
+/*
+ * Reset the color pair, e.g., to whatever color pair 0 is.
+ */
+static bool
+reset_color_pair(void)
+{
+ bool result = FALSE;
+
+ if (orig_pair != 0) {
+ TPUTS_TRACE("orig_pair");
+ putp(orig_pair);
+ result = TRUE;
+ }
+ return result;
+}
+
+/*
+ * Reset color pairs and definitions. Actually we do both more to accommodate
+ * badly-written terminal descriptions than for the relatively rare case where
+ * someone has changed the color definitions.
+ */
+bool
+_nc_reset_colors(void)
+{
+ int result = FALSE;
+
+ T((T_CALLED("_nc_reset_colors()")));
+ if (SP->_color_defs > 0)
+ SP->_color_defs = -(SP->_color_defs);
+
+ if (reset_color_pair())
+ result = TRUE;
+ if (orig_colors != 0) {
+ TPUTS_TRACE("orig_colors");
+ putp(orig_colors);
+ result = TRUE;
+ }
+ returnBool(result);
+}
+
+NCURSES_EXPORT(int)
+start_color(void)
+{
+ int result = ERR;
+
+ T((T_CALLED("start_color()")));
+
+ if (SP == 0) {
+ result = ERR;
+ } else if (SP->_coloron) {
+ result = OK;
+ } else {
+
+ if (reset_color_pair() != TRUE) {
+ set_foreground_color(default_fg(), _nc_outch);
+ set_background_color(default_bg(), _nc_outch);
+ }
+
+ if (max_pairs > 0 && max_colors > 0) {
+ SP->_pair_count = max_pairs;
+ SP->_color_count = max_colors;
+#if !USE_REENTRANT
+ COLOR_PAIRS = max_pairs;
+ COLORS = max_colors;
+#endif
+
+ if ((SP->_color_pairs = TYPE_CALLOC(colorpair_t,
+ max_pairs)) != 0) {
+ if ((SP->_color_table = TYPE_CALLOC(color_t,
+ max_colors)) != 0) {
+ SP->_color_pairs[0] = PAIR_OF(default_fg(), default_bg());
+ init_color_table();
+
+ T(("started color: COLORS = %d, COLOR_PAIRS = %d",
+ COLORS, COLOR_PAIRS));
+
+ SP->_coloron = 1;
+ result = OK;
+ } else if (SP->_color_pairs != 0) {
+ FreeAndNull(SP->_color_pairs);
+ }
+ }
+ } else {
+ result = OK;
+ }
+ }
+ returnCode(result);
+}
+
+/* This function was originally written by Daniel Weaver <danw@znyx.com> */
+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;
+}
+
+/*
+ * Extension (1997/1/18) - Allow negative f/b values to set default color
+ * values.
+ */
+NCURSES_EXPORT(int)
+init_pair(short pair, short f, short b)
+{
+ colorpair_t result;
+
+ T((T_CALLED("init_pair(%d,%d,%d)"), pair, f, b));
+
+ if ((pair < 0) || (pair >= COLOR_PAIRS) || SP == 0 || !SP->_coloron)
+ returnCode(ERR);
+#if NCURSES_EXT_FUNCS
+ if (SP->_default_color) {
+ if (f < 0)
+ f = COLOR_DEFAULT;
+ if (b < 0)
+ b = COLOR_DEFAULT;
+ if (!OkColorHi(f) && !isDefaultColor(f))
+ returnCode(ERR);
+ if (!OkColorHi(b) && !isDefaultColor(b))
+ returnCode(ERR);
+ } else
+#endif
+ {
+ if ((f < 0) || !OkColorHi(f)
+ || (b < 0) || !OkColorHi(b)
+ || (pair < 1))
+ returnCode(ERR);
+ }
+
+ /*
+ * 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).
+ */
+ result = PAIR_OF(f, b);
+ if (SP->_color_pairs[pair] != 0
+ && SP->_color_pairs[pair] != result) {
+ int y, x;
+
+ for (y = 0; y <= curscr->_maxy; y++) {
+ struct ldat *ptr = &(curscr->_line[y]);
+ bool changed = FALSE;
+ for (x = 0; x <= curscr->_maxx; x++) {
+ if (GetPair(ptr->text[x]) == pair) {
+ /* Set the old cell to zero to ensure it will be
+ updated on the next doupdate() */
+ SetChar(ptr->text[x], 0, 0);
+ CHANGED_CELL(ptr, x);
+ changed = TRUE;
+ }
+ }
+ if (changed)
+ _nc_make_oldhash(y);
+ }
+ }
+ SP->_color_pairs[pair] = result;
+ if (GET_SCREEN_PAIR(SP) == pair)
+ SET_SCREEN_PAIR(SP, (chtype) (~0)); /* force attribute update */
+
+ if (initialize_pair && InPalette(f) && InPalette(b)) {
+ const color_t *tp = hue_lightness_saturation ? hls_palette : cga_palette;
+
+ TR(TRACE_ATTRS,
+ ("initializing pair: pair = %d, fg=(%d,%d,%d), bg=(%d,%d,%d)",
+ pair,
+ tp[f].red, tp[f].green, tp[f].blue,
+ tp[b].red, tp[b].green, tp[b].blue));
+
+ TPUTS_TRACE("initialize_pair");
+ putp(TPARM_7(initialize_pair,
+ pair,
+ tp[f].red, tp[f].green, tp[f].blue,
+ tp[b].red, tp[b].green, tp[b].blue));
+ }
+
+ returnCode(OK);
+}
+
+#define okRGB(n) ((n) >= 0 && (n) <= 1000)
+
+NCURSES_EXPORT(int)
+init_color(short color, short r, short g, short b)
+{
+ int result = ERR;
+
+ T((T_CALLED("init_color(%d,%d,%d,%d)"), color, r, g, b));
+
+ if (initialize_color != NULL
+ && SP != 0
+ && SP->_coloron
+ && (color >= 0 && OkColorHi(color))
+ && (okRGB(r) && okRGB(g) && okRGB(b))) {
+
+ SP->_color_table[color].init = 1;
+ SP->_color_table[color].r = r;
+ SP->_color_table[color].g = g;
+ SP->_color_table[color].b = b;
+
+ if (hue_lightness_saturation) {
+ rgb2hls(r, g, b,
+ &SP->_color_table[color].red,
+ &SP->_color_table[color].green,
+ &SP->_color_table[color].blue);
+ } else {
+ SP->_color_table[color].red = r;
+ SP->_color_table[color].green = g;
+ SP->_color_table[color].blue = b;
+ }
+
+ TPUTS_TRACE("initialize_color");
+ putp(TPARM_4(initialize_color, color, r, g, b));
+ SP->_color_defs = max(color + 1, SP->_color_defs);
+ result = OK;
+ }
+ returnCode(result);
+}
+
+NCURSES_EXPORT(bool)
+can_change_color(void)
+{
+ T((T_CALLED("can_change_color()")));
+ returnCode((can_change != 0) ? TRUE : FALSE);
+}
+
+NCURSES_EXPORT(bool)
+has_colors(void)
+{
+ T((T_CALLED("has_colors()")));
+ returnCode((VALID_NUMERIC(max_colors) && VALID_NUMERIC(max_pairs)
+ && (((set_foreground != NULL)
+ && (set_background != NULL))
+ || ((set_a_foreground != NULL)
+ && (set_a_background != NULL))
+ || set_color_pair)) ? TRUE : FALSE);
+}
+
+NCURSES_EXPORT(int)
+color_content(short color, short *r, short *g, short *b)
+{
+ int result;
+
+ T((T_CALLED("color_content(%d,%p,%p,%p)"), color, r, g, b));
+ if (color < 0 || !OkColorHi(color) || SP == 0 || !SP->_coloron) {
+ result = ERR;
+ } else {
+ NCURSES_COLOR_T c_r = SP->_color_table[color].red;
+ NCURSES_COLOR_T c_g = SP->_color_table[color].green;
+ NCURSES_COLOR_T c_b = SP->_color_table[color].blue;
+
+ if (r)
+ *r = c_r;
+ if (g)
+ *g = c_g;
+ if (b)
+ *b = c_b;
+
+ TR(TRACE_ATTRS, ("...color_content(%d,%d,%d,%d)",
+ color, c_r, c_g, c_b));
+ result = OK;
+ }
+ returnCode(result);
+}
+
+NCURSES_EXPORT(int)
+pair_content(short pair, short *f, short *b)
+{
+ int result;
+
+ T((T_CALLED("pair_content(%d,%p,%p)"), pair, f, b));
+
+ if ((pair < 0) || (pair >= COLOR_PAIRS) || SP == 0 || !SP->_coloron) {
+ result = ERR;
+ } else {
+ NCURSES_COLOR_T fg = ((SP->_color_pairs[pair] >> C_SHIFT) & C_MASK);
+ NCURSES_COLOR_T bg = (SP->_color_pairs[pair] & C_MASK);
+
+#if NCURSES_EXT_FUNCS
+ if (fg == COLOR_DEFAULT)
+ fg = -1;
+ if (bg == COLOR_DEFAULT)
+ bg = -1;
+#endif
+
+ if (f)
+ *f = fg;
+ if (b)
+ *b = bg;
+
+ TR(TRACE_ATTRS, ("...pair_content(%d,%d,%d)", pair, fg, bg));
+ result = OK;
+ }
+ returnCode(result);
+}
+
+NCURSES_EXPORT(void)
+_nc_do_color(short old_pair, short pair, bool reverse, int (*outc) (int))
+{
+ NCURSES_COLOR_T fg = COLOR_DEFAULT;
+ NCURSES_COLOR_T bg = COLOR_DEFAULT;
+ NCURSES_COLOR_T old_fg, old_bg;
+
+ if (pair < 0 || pair >= COLOR_PAIRS) {
+ return;
+ } else if (pair != 0) {
+ if (set_color_pair) {
+ TPUTS_TRACE("set_color_pair");
+ tputs(TPARM_1(set_color_pair, pair), 1, outc);
+ return;
+ } else if (SP != 0) {
+ pair_content((short) pair, &fg, &bg);
+ }
+ }
+
+ if (old_pair >= 0
+ && SP != 0
+ && pair_content(old_pair, &old_fg, &old_bg) != ERR) {
+ if ((isDefaultColor(fg) && !isDefaultColor(old_fg))
+ || (isDefaultColor(bg) && !isDefaultColor(old_bg))) {
+#if NCURSES_EXT_FUNCS
+ /*
+ * A minor optimization - but extension. If "AX" is specified in
+ * the terminal description, treat it as screen's indicator of ECMA
+ * SGR 39 and SGR 49, and assume the two sequences are independent.
+ */
+ if (SP->_has_sgr_39_49
+ && isDefaultColor(old_bg)
+ && !isDefaultColor(old_fg)) {
+ tputs("\033[39m", 1, outc);
+ } else if (SP->_has_sgr_39_49
+ && isDefaultColor(old_fg)
+ && !isDefaultColor(old_bg)) {
+ tputs("\033[49m", 1, outc);
+ } else
+#endif
+ reset_color_pair();
+ }
+ } else {
+ reset_color_pair();
+ if (old_pair < 0)
+ return;
+ }
+
+#if NCURSES_EXT_FUNCS
+ if (isDefaultColor(fg))
+ fg = default_fg();
+ if (isDefaultColor(bg))
+ bg = default_bg();
+#endif
+
+ if (reverse) {
+ NCURSES_COLOR_T xx = fg;
+ fg = bg;
+ bg = xx;
+ }
+
+ TR(TRACE_ATTRS, ("setting colors: pair = %d, fg = %d, bg = %d", pair,
+ fg, bg));
+
+ if (!isDefaultColor(fg)) {
+ set_foreground_color(fg, outc);
+ }
+ if (!isDefaultColor(bg)) {
+ set_background_color(bg, outc);
+ }
+}