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+<!--
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- * Copyright (c) 2017 Free Software Foundation, Inc. *
+ * Copyright 2018-2020,2021 Thomas E. Dickey *
+ * Copyright 2017 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 *
* authorization. *
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* Author: Thomas E. Dickey
- * @Id: new_pair.3x,v 1.10 2017/11/18 23:48:44 tom Exp @
+ * @Id: new_pair.3x,v 1.16 2021/06/17 21:26:02 tom Exp @
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</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
- <STRONG>int</STRONG> <STRONG>alloc_pair(int</STRONG> <STRONG>fg,</STRONG> <STRONG>int</STRONG> <STRONG>bg);</STRONG>
- <STRONG>int</STRONG> <STRONG>find_pair(int</STRONG> <STRONG>fg,</STRONG> <STRONG>int</STRONG> <STRONG>bg);</STRONG>
- <STRONG>int</STRONG> <STRONG>free_pair(int</STRONG> <STRONG>pair);</STRONG>
+ <STRONG>int</STRONG> <STRONG>alloc_pair(int</STRONG> <EM>fg</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bg</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>find_pair(int</STRONG> <EM>fg</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bg</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>free_pair(int</STRONG> <EM>pair</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
These functions are an extension to the curses library. They permit an
- application to dynamically allocate a color pair using the fore-
- ground/background colors rather than assign a fixed color pair number,
- and return an unused pair to the pool.
+ application to dynamically allocate a color pair using the
+ foreground/background colors rather than assign a fixed color pair
+ number, and return an unused pair to the pool.
The number of colors may be related to the number of possible color
pairs for a given terminal, or it may not:
- <STRONG>o</STRONG> While almost all terminals allow setting the color <EM>attributes</EM> inde-
- pendently, it is unlikely that your terminal allows you to modify
- the attributes of a given character cell without rewriting it.
- That is, the foreground and background colors are applied as a
+ <STRONG>o</STRONG> While almost all terminals allow setting the color <EM>attributes</EM>
+ independently, it is unlikely that your terminal allows you to
+ modify the attributes of a given character cell without rewriting
+ it. That is, the foreground and background colors are applied as a
pair.
- <STRONG>o</STRONG> Color pairs are the curses library's way of managing a color pal-
- ette on a terminal. If the library does not keep track of the <EM>com-</EM>
- <EM>binations</EM> of colors which are displayed, it will be inefficient.
+ <STRONG>o</STRONG> Color pairs are the curses library's way of managing a color
+ palette on a terminal. If the library does not keep track of the
+ <EM>combinations</EM> of colors which are displayed, it will be inefficient.
- <STRONG>o</STRONG> For simple terminal emulators with only a few dozen color combina-
- tions, it is convenient to use the maximum number of combinations
- as the limit on color pairs:
+ <STRONG>o</STRONG> For simple terminal emulators with only a few dozen color
+ combinations, it is convenient to use the maximum number of
+ combinations as the limit on color pairs:
<STRONG>COLORS</STRONG> <EM>*</EM> <STRONG>COLORS</STRONG>
a predefined color scheme.
Beyond that lies in the realm of programs using the foreground and
- background colors for "ASCII art" (or some other non-textual appli-
- cation).
+ background colors for "ASCII art" (or some other non-textual
+ application).
Also beyond those few dozen pairs, the required size for a table to
represent the combinations grows rapidly with an increasing number
</PRE><H3><a name="h3-alloc_pair">alloc_pair</a></H3><PRE>
- The <STRONG>alloc_pair</STRONG> function accepts parameters for foreground and back-
- ground color, and checks if that color combination is already associ-
- ated with a color pair.
+ The <STRONG>alloc_pair</STRONG> function accepts parameters for foreground and
+ background color, and checks if that color combination is already
+ associated with a color pair.
<STRONG>o</STRONG> If the combination already exists, <STRONG>alloc_pair</STRONG> returns the existing
pair.
<STRONG>o</STRONG> If the combination does not exist, <STRONG>alloc_pair</STRONG> allocates a new color
pair and returns that.
- <STRONG>o</STRONG> If the table fills up, <STRONG>alloc_pair</STRONG> discards the least-recently allo-
- cated entry using <STRONG>free_pair</STRONG> and allocates a new color pair.
+ <STRONG>o</STRONG> If the table fills up, <STRONG>alloc_pair</STRONG> discards the least-recently
+ allocated entry using <STRONG>free_pair</STRONG> and allocates a new color pair.
All of the color pairs are allocated from a table of possible color
- pairs. The size of the table is determined by the terminfo <EM>pairs</EM> capa-
- bility. The table is shared with <STRONG>init_pair</STRONG>; in fact <STRONG>alloc_pair</STRONG> calls
- <STRONG>init_pair</STRONG> after updating the ncurses library's fast index to the colors
- versus color pairs.
+ pairs. The size of the table is determined by the terminfo <EM>pairs</EM>
+ capability. The table is shared with <STRONG>init_pair</STRONG>; in fact <STRONG>alloc_pair</STRONG>
+ calls <STRONG>init_pair</STRONG> after updating the ncurses library's fast index to the
+ colors versus color pairs.
</PRE><H3><a name="h3-find_pair">find_pair</a></H3><PRE>
The <STRONG>find_pair</STRONG> function accepts parameters for foreground and background
color, and checks if that color combination is already associated with
- a color pair, returning the pair number if it has been allocated. Oth-
- erwise it returns -1.
+ a color pair, returning the pair number if it has been allocated.
+ Otherwise it returns -1.
</PRE><H3><a name="h3-free_pair">free_pair</a></H3><PRE>
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
- <STRONG><A HREF="init_pair.3x.html">init_pair(3x)</A></STRONG>.
+ <STRONG><A HREF="curs_color.3x.html">curs_color(3x)</A></STRONG>.
</PRE><H2><a name="h2-AUTHOR">AUTHOR</a></H2><PRE>
projects / ncurses.git / blobdiff