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+<H2>NAME</H2><PRE>
+ <B>dft_fgbg</B>: <B>use_default_colors</B>, <B>assume_default_colors</B> - use
+ terminal's default colors
+
+
+</PRE>
+<H2>SYNOPSIS</H2><PRE>
+ <B>#include</B> <B><curses.h></B>
+
+ <B>int</B> <B>use_default_colors(void);</B>
+ <B>int</B> <B>assume_default_colors(int</B> <B>fg,</B> <B>int</B> <B>bg);</B>
+
+
+</PRE>
+<H2>DESCRIPTION</H2><PRE>
+ The <I>use</I><B>_</B><I>default</I><B>_</B><I>colors()</I> and <I>assume</I><B>_</B><I>default</I><B>_</B><I>colors()</I> func-
+ tions are extensions to the curses library. They are used
+ with terminals that support ISO 6429 color, or equivalent.
+ These terminals allow the application to reset color to an
+ unspecified default value (e.g., with SGR 39 or SGR 49).
+
+ Applications that paint a colored background over the
+ whole screen do not take advantage of SGR 39 and SGR 49.
+ Some applications are designed to work with the default
+ background, using colors only for text. For example,
+ there are several implementations of the <B>ls</B> program which
+ use colors to denote different file types or permissions.
+ These "color ls" programs do not necessarily modify the
+ background color, typically using only the <I>setaf</I> terminfo
+ capability to set the foreground color. Full-screen
+ applications that use default colors can achieve similar
+ visual effects.
+
+ The first function, <I>use</I><B>_</B><I>default</I><B>_</B><I>colors()</I> tells the curses
+ library to assign terminal default foreground/background
+ colors to color number -1. So init_pair(x,COLOR_RED,-1)
+ will initialize pair x as red on default background and
+ init_pair(x,-1,COLOR_BLUE) will initialize pair x as
+ default foreground on blue.
+
+ The other, <I>assume</I><B>_</B><I>default</I><B>_</B><I>colors()</I> is a refinement which
+ tells which colors to paint for color pair 0. This func-
+ tion recognizes a special color number -1, which denotes
+ the default terminal color.
+
+ The following are equivalent:
+ <I>use</I><B>_</B><I>default</I><B>_</B><I>colors();</I>
+ <I>assume</I><B>_</B><I>default</I><B>_</B><I>colors(-1,-1);</I>
+
+ These are ncurses extensions. For other curses implemen-
+ tations, color number -1 does not mean anything, just as
+ for ncurses before a successful call of <I>use</I><B>_</B><I>default</I><B>_</B><I>col-</I>
+ <I>ors()</I> or <I>assume</I><B>_</B><I>default</I><B>_</B><I>colors()</I>.
+
+ Other curses implementations do not allow an application
+ to modify color pair 0. They assume that the background
+ is COLOR_BLACK, but do not ensure that the color pair 0 is
+ painted to match the assumption. If your application does
+ not use either <I>use</I><B>_</B><I>default</I><B>_</B><I>colors()</I> or <I>assume</I><B>_</B><I>default</I><B>_</B><I>col-</I>
+ <I>ors()</I> ncurses will paint a white foreground (text) with
+ black background for color pair 0.
+
+
+</PRE>
+<H2>RETURN VALUE</H2><PRE>
+ These functions return the integer <B>ERR</B> upon failure and <B>OK</B>
+ on success. They will fail if either the terminal does
+ not support the <I>orig</I><B>_</B><I>pair</I> or <I>orig</I><B>_</B><I>colors</I> capability. If
+ the <I>initialize</I><B>_</B><I>pair</I> capability is found, this causes an
+ error as well.
+
+
+</PRE>
+<H2>NOTES</H2><PRE>
+ Associated with this extension, the <B><A HREF="init_pair.3x.html">init_pair(3x)</A></B> function
+ accepts negative arguments to specify default foreground
+ or background colors.
+
+
+</PRE>
+<H2>PORTABILITY</H2><PRE>
+ These routines are specific to ncurses. They were not
+ supported on Version 7, BSD or System V implementations.
+ It is recommended that any code depending on them be con-
+ ditioned using NCURSES_VERSION.
+
+
+</PRE>
+<H2>SEE ALSO</H2><PRE>
+ <B><A HREF="curs_color.3x.html">curs_color(3x)</A></B>, <B><A HREF="ded.1.html">ded(1)</A></B>.
+
+
+</PRE>
+<H2>AUTHOR</H2><PRE>
+ Thomas Dickey (from an analysis of the requirements for
+ color xterm for XFree86 3.1.2C, February 1996).
+
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