X-Git-Url: https://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=ncurses%2Fbase%2Flib_color.c;h=492194babbfbb7de35b1204bbb20737bb487667c;hb=refs%2Ftags%2Fv5.2;hp=297a14c36d6eaf518825f697d0c2918771d9fdb6;hpb=0eb88fc5281804773e2a0c7a488a4452463535ce;p=ncurses.git

diff --git a/ncurses/base/lib_color.c b/ncurses/base/lib_color.c
index 297a14c3..492194ba 100644
--- a/ncurses/base/lib_color.c
+++ b/ncurses/base/lib_color.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ * Copyright (c) 1998,1999,2000 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            *
@@ -34,22 +34,22 @@
 /* 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 1.36 1999/10/03 00:20:37 Philippe.Blain Exp $")
+MODULE_ID("$Id: lib_color.c,v 1.53 2000/09/02 18:02:15 tom 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
+ * historical reasons.  So we assign them in start_color() and also in
  * set_term()'s screen-switching logic.
  */
-int COLOR_PAIRS;
-int COLORS;
+int COLOR_PAIRS = 0;
+int COLORS = 0;
 
 /*
  * Given a RGB range of 0..1000, we'll normally set the individual values
@@ -57,141 +57,179 @@ int COLORS;
  */
 #define RGB_ON  680
 #define RGB_OFF 0
-
+/* *INDENT-OFF* */
 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 */
+    /*  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 */
+    /*  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 */
 };
+/* *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)
+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};
+	{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))
+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);
-	}
+    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))
+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);
-	}
+    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)
+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;
+    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)
+int
+start_color(void)
 {
-	T((T_CALLED("start_color()")));
+    int n;
+    const color_t *tp;
+
+    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 (set_original_colors() != TRUE) {
+	set_foreground_color(default_fg(), _nc_outch);
+	set_background_color(default_bg(), _nc_outch);
+    }
+
+    if (VALID_NUMERIC(max_pairs))
+	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(default_fg(), default_bg());
+    if (VALID_NUMERIC(max_colors))
+	COLORS = SP->_color_count = max_colors;
+    else
+	returnCode(ERR);
+    SP->_coloron = 1;
+
+    if ((SP->_color_table = typeMalloc(color_t, COLORS)) == 0)
+	returnCode(ERR);
+    tp = (hue_lightness_saturation) ? hls_palette : cga_palette;
+    for (n = 0; n < COLORS; n++) {
+	if (n < 8) {
+	    SP->_color_table[n] = tp[n];
+	} else {
+	    SP->_color_table[n] = tp[n % 8];
+	    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;
+	    }
 	}
+    }
 
-	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);
+    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)
+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;
+    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 */
-    {
+    if (min == max) {		/* black, white and all shades of gray */
 	*h = 0;
 	*s = 0;
 	return;
@@ -200,16 +238,16 @@ static void rgb2hls(short r, short g, short b, short *h, short *l, short *s)
     /* calculate saturation */
     if (*l < 50)
 	*s = ((max - min) * 100) / (max + min);
-    else *s = ((max - min) * 100) / (2000 - 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
-	if (g == max)
-	    t = 240 + ((b - r) * 60) / (max - min);
-	else
-	    t = 360 + ((r - g) * 60) / (max - min);
+	t = 360 + ((r - g) * 60) / (max - min);
 
     *h = t % 360;
 }
@@ -218,212 +256,227 @@ static void rgb2hls(short r, short g, short b, short *h, short *l, short *s)
  * Extension (1997/1/18) - Allow negative f/b values to set default color
  * values.
  */
-int init_pair(short pair, short f, short b)
+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
+    unsigned result;
+
+    T((T_CALLED("init_pair(%d,%d,%d)"), pair, f, b));
+
+    if ((pair < 0) || (pair >= COLOR_PAIRS))
+	returnCode(ERR);
+#if NCURSES_EXT_FUNCS
+    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
+#endif
+    {
 	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;
-		    }
+	    || (b < 0) || (b >= COLORS)
+	    || (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;
+	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);
 	    }
+	    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));
-	    }
+    }
+    SP->_color_pairs[pair] = result;
+    if ((int) (SP->_current_attr & A_COLOR) == COLOR_PAIR(pair))
+	SP->_current_attr |= A_COLOR;	/* force attribute update */
+
+    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);
+    returnCode(OK);
 }
 
-int init_color(short color, short r, short g, short b)
+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;
-	}
+    T((T_CALLED("init_color(%d,%d,%d,%d)"), color, r, g, b));
 
-	if (initialize_color)
-	{
-		TPUTS_TRACE("initialize_color");
-		putp(tparm(initialize_color, color, r, g, b));
-	}
-	returnCode(OK);
+    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)
+bool
+can_change_color(void)
 {
-	T((T_CALLED("can_change_color()")));
-	returnCode ((can_change != 0) ? TRUE : FALSE);
+    T((T_CALLED("can_change_color()")));
+    returnCode((can_change != 0) ? TRUE : FALSE);
 }
 
-bool has_colors(void)
+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);
+    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);
 }
 
-int color_content(short color, short *r, short *g, short *b)
+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;
+    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)
+int
+pair_content(short pair, short *f, short *b)
 {
-	T((T_CALLED("pair_content(%d,%p,%p)"), pair, f, 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);
+    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);
+    returnCode(OK);
 }
 
-void _nc_do_color(int pair, bool reverse, int (*outc)(int))
+void
+_nc_do_color(int old_pair, int pair, bool reverse, int (*outc) (int))
 {
-    short fg, bg;
+    NCURSES_COLOR_T fg = C_MASK, bg = C_MASK;
+    NCURSES_COLOR_T old_fg, old_bg;
 
-    if (pair == 0)
-    {
-	if (orig_pair)
-	{
-	    TPUTS_TRACE("orig_pair");
-	    tputs(orig_pair, 1, outc);
-	}
-	else if (set_color_pair)
-	{
+    if (pair < 0 || pair >= COLOR_PAIRS) {
+	return;
+    } else if (pair != 0) {
+	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);
+	    return;
+	} else if (SP != 0) {
+	    pair_content(pair, &fg, &bg);
 	}
     }
-    else
-    {
-	if (set_color_pair)
-	{
-	    TPUTS_TRACE("set_color_pair");
-	    tputs(tparm(set_color_pair, pair), 1, outc);
+
+    if (old_pair >= 0 && SP != 0) {
+	pair_content(old_pair, &old_fg, &old_bg);
+	if ((fg == C_MASK && old_fg != C_MASK)
+	    || (bg == C_MASK && old_bg != C_MASK)) {
+#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 && old_bg == C_MASK && old_fg != C_MASK) {
+		tputs("\033[39m", 1, outc);
+	    } else if (SP->_has_sgr_39_49 && old_fg == C_MASK && old_bg != C_MASK) {
+		tputs("\033[49m", 1, outc);
+	    } else
+#endif
+		set_original_colors();
 	}
-	else
-	{
-	    pair_content(pair, &fg, &bg);
-	    if (reverse) {
-		short xx = fg;
-		fg = bg;
-		bg = xx;
-	    }
+    } else {
+	set_original_colors();
+	if (old_pair < 0)
+	    return;
+    }
 
-	    T(("setting colors: pair = %d, fg = %d, bg = %d", pair, fg, bg));
+#if NCURSES_EXT_FUNCS
+    if (fg == C_MASK)
+	fg = default_fg();
+    if (bg == C_MASK)
+	bg = default_bg();
+#endif
+
+    if (reverse) {
+	NCURSES_COLOR_T xx = fg;
+	fg = bg;
+	bg = xx;
+    }
 
-	    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);
-	    }
-	}
+    TR(TRACE_ATTRS, ("setting colors: pair = %d, fg = %d, bg = %d", pair, fg, bg));
+
+    if (fg != C_MASK) {
+	set_foreground_color(fg, outc);
+    }
+    if (bg != C_MASK) {
+	set_background_color(bg, outc);
     }
 }