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+/****************************************************************************
+ * Copyright (c) 1998 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> *
+ ****************************************************************************/
+
+/* lib_color.c
+ *
+ * Handles color emulation of SYS V curses
+ *
+ */
+
+#include <curses.priv.h>
+
+#include <term.h>
+
+MODULE_ID("$Id: lib_color.c,v 1.35 1999/03/15 01:45:14 Alexander.V.Lukyanov Exp $")
+
+/*
+ * These should be screen structure members. They need to be globals for
+ * hystorical reasons. So we assign them in start_color() and also in
+ * set_term()'s screen-switching logic.
+ */
+int COLOR_PAIRS;
+int COLORS;
+
+/*
+ * 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
+
+static const color_t cga_palette[] =
+{
+ /* R G B */
+ {RGB_OFF, RGB_OFF, RGB_OFF}, /* COLOR_BLACK */
+ {RGB_ON, RGB_OFF, RGB_OFF}, /* COLOR_RED */
+ {RGB_OFF, RGB_ON, RGB_OFF}, /* COLOR_GREEN */
+ {RGB_ON, RGB_ON, RGB_OFF}, /* COLOR_YELLOW */
+ {RGB_OFF, RGB_OFF, RGB_ON}, /* COLOR_BLUE */
+ {RGB_ON, RGB_OFF, RGB_ON}, /* COLOR_MAGENTA */
+ {RGB_OFF, RGB_ON, RGB_ON}, /* COLOR_CYAN */
+ {RGB_ON, RGB_ON, RGB_ON}, /* 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 */
+};
+
+/*
+ * 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(set_a_background, bg), 1, outc);
+ }
+ else
+ {
+ TPUTS_TRACE("set_background");
+ tputs(tparm(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(set_a_foreground, fg), 1, outc);
+ }
+ else
+ {
+ TPUTS_TRACE("set_foreground");
+ tputs(tparm(set_foreground, toggled_colors(fg)), 1, outc);
+ }
+}
+
+static bool set_original_colors(void)
+{
+ if (orig_pair != 0) {
+ TPUTS_TRACE("orig_pair");
+ putp(orig_pair);
+ return TRUE;
+ }
+ else if (orig_colors != NULL)
+ {
+ TPUTS_TRACE("orig_colors");
+ putp(orig_colors);
+ return TRUE;
+ }
+ return FALSE;
+}
+
+int start_color(void)
+{
+ T((T_CALLED("start_color()")));
+
+ if (set_original_colors() != TRUE)
+ {
+ set_foreground_color(COLOR_WHITE, _nc_outch);
+ set_background_color(COLOR_BLACK, _nc_outch);
+ }
+
+ if (max_pairs != -1)
+ COLOR_PAIRS = SP->_pair_count = max_pairs;
+ else
+ returnCode(ERR);
+ if ((SP->_color_pairs = typeCalloc(unsigned short, max_pairs)) == 0)
+ returnCode(ERR);
+ SP->_color_pairs[0] = PAIR_OF(COLOR_WHITE, COLOR_BLACK);
+ if (max_colors != -1)
+ COLORS = SP->_color_count = max_colors;
+ else
+ returnCode(ERR);
+ SP->_coloron = 1;
+
+ if ((SP->_color_table = typeMalloc(color_t, COLORS)) == 0)
+ returnCode(ERR);
+ if (hue_lightness_saturation)
+ memcpy(SP->_color_table, hls_palette, sizeof(color_t) * COLORS);
+ else
+ memcpy(SP->_color_table, cga_palette, sizeof(color_t) * COLORS);
+
+ T(("started color: COLORS = %d, COLOR_PAIRS = %d", COLORS, COLOR_PAIRS));
+
+ returnCode(OK);
+}
+
+/* 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.
+ */
+int init_pair(short pair, short f, short b)
+{
+ unsigned result;
+
+ T((T_CALLED("init_pair(%d,%d,%d)"), pair, f, b));
+
+ if ((pair < 1) || (pair >= COLOR_PAIRS))
+ returnCode(ERR);
+ if (SP->_default_color)
+ {
+ if (f < 0)
+ f = C_MASK;
+ if (b < 0)
+ b = C_MASK;
+ if (f >= COLORS && f != C_MASK)
+ returnCode(ERR);
+ if (b >= COLORS && b != C_MASK)
+ returnCode(ERR);
+ }
+ else
+ if ((f < 0) || (f >= COLORS)
+ || (b < 0) || (b >= COLORS))
+ 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;
+ attr_t z = COLOR_PAIR(pair);
+
+ for (y = 0; y <= curscr->_maxy; y++) {
+ struct ldat *ptr = &(curscr->_line[y]);
+ bool changed = FALSE;
+ for (x = 0; x <= curscr->_maxx; x++) {
+ if ((ptr->text[x] & A_COLOR) == z) {
+ /* Set the old cell to zero to ensure it will be
+ updated on the next doupdate() */
+ ptr->text[x] = 0;
+ CHANGED_CELL(ptr,x);
+ changed = TRUE;
+ }
+ }
+ if (changed)
+ _nc_make_oldhash(y);
+ }
+ }
+ SP->_color_pairs[pair] = result;
+
+ 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)",
+ 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));
+ }
+ }
+
+ returnCode(OK);
+}
+
+int init_color(short color, short r, short g, short b)
+{
+ T((T_CALLED("init_color(%d,%d,%d,%d)"), color, r, g, b));
+
+ if (initialize_color == NULL)
+ returnCode(ERR);
+
+ if (color < 0 || color >= COLORS)
+ returnCode(ERR);
+ if (r < 0 || r > 1000 || g < 0 || g > 1000 || b < 0 || b > 1000)
+ returnCode(ERR);
+
+ 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;
+ }
+
+ if (initialize_color)
+ {
+ TPUTS_TRACE("initialize_color");
+ putp(tparm(initialize_color, color, r, g, b));
+ }
+ returnCode(OK);
+}
+
+bool can_change_color(void)
+{
+ T((T_CALLED("can_change_color()")));
+ returnCode ((can_change != 0) ? TRUE : FALSE);
+}
+
+bool has_colors(void)
+{
+ T((T_CALLED("has_colors()")));
+ returnCode (((max_colors != -1) && (max_pairs != -1)
+ && (((set_foreground != NULL)
+ && (set_background != NULL))
+ || ((set_a_foreground != NULL)
+ && (set_a_background != NULL))
+ || set_color_pair)) ? TRUE : FALSE);
+}
+
+int color_content(short color, short *r, short *g, short *b)
+{
+ T((T_CALLED("color_content(%d,%p,%p,%p)"), color, r, g, b));
+ if (color < 0 || color > COLORS)
+ returnCode(ERR);
+
+ if (r) *r = SP->_color_table[color].red;
+ if (g) *g = SP->_color_table[color].green;
+ if (b) *b = SP->_color_table[color].blue;
+ returnCode(OK);
+}
+
+int pair_content(short pair, short *f, short *b)
+{
+ T((T_CALLED("pair_content(%d,%p,%p)"), pair, f, b));
+
+ if ((pair < 0) || (pair > COLOR_PAIRS))
+ returnCode(ERR);
+ if (f) *f = ((SP->_color_pairs[pair] >> C_SHIFT) & C_MASK);
+ if (b) *b = (SP->_color_pairs[pair] & C_MASK);
+
+ returnCode(OK);
+}
+
+void _nc_do_color(int pair, bool reverse, 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
+ {
+ set_foreground_color(COLOR_WHITE, outc);
+ set_background_color(COLOR_BLACK, 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);
+ if (reverse) {
+ short xx = fg;
+ fg = bg;
+ bg = xx;
+ }
+
+ T(("setting colors: pair = %d, fg = %d, bg = %d", pair, fg, bg));
+
+ if (fg == C_MASK || bg == C_MASK)
+ {
+ if (set_original_colors() != TRUE)
+ {
+ if (fg == C_MASK)
+ set_foreground_color(COLOR_WHITE, outc);
+ if (bg == C_MASK)
+ set_background_color(COLOR_BLACK, outc);
+ }
+ }
+ if (fg != C_MASK)
+ {
+ set_foreground_color(fg, outc);
+ }
+ if (bg != C_MASK)
+ {
+ set_background_color(bg, outc);
+ }
+ }
+ }
+}