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-<H1>curs_color 3x</H1>
-<HR>
+<H1 class="no-header">curs_color 3x</H1>
<PRE>
-<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="curs_color.3x.html">curs_color(3x)</A></STRONG> <STRONG><A HREF="curs_color.3x.html">curs_color(3x)</A></STRONG>
</PRE>
+<H2>
<a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>start_color</STRONG>, <STRONG>init_pair</STRONG>, <STRONG>init_color</STRONG>, <STRONG>has_colors</STRONG>,
<STRONG>can_change_color</STRONG>, <STRONG>color_content</STRONG>, <STRONG>pair_content</STRONG>, <STRONG>COLOR_PAIR</STRONG>
- <STRONG>curses</STRONG> color manipulation routines
</PRE>
+<H2>
<a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#</STRONG> <STRONG>include</STRONG> <STRONG><curses.h></STRONG>
+
<STRONG>int</STRONG> <STRONG>start_color(void);</STRONG>
<STRONG>int</STRONG> <STRONG>init_pair(short</STRONG> <STRONG>pair,</STRONG> <STRONG>short</STRONG> <STRONG>f,</STRONG> <STRONG>short</STRONG> <STRONG>b);</STRONG>
<STRONG>int</STRONG> <STRONG>init_color(short</STRONG> <STRONG>color,</STRONG> <STRONG>short</STRONG> <STRONG>r,</STRONG> <STRONG>short</STRONG> <STRONG>g,</STRONG> <STRONG>short</STRONG> <STRONG>b);</STRONG>
</PRE>
-<H2>DESCRIPTION</H2><PRE>
- <STRONG>Overview</STRONG>
+<H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+
+</PRE>
+<H3><a name="h3-Overview">Overview</a></H3><PRE>
<STRONG>curses</STRONG> support color attributes on terminals with that ca-
pability. To use these routines <STRONG>start_color</STRONG> must be
called, usually right after <STRONG>initscr</STRONG>. Colors are always
ters are displayed). A programmer initializes a color-
pair with the routine <STRONG>init_pair</STRONG>. After it has been ini-
tialized, <STRONG>COLOR_PAIR</STRONG>(<EM>n</EM>), a macro defined in <STRONG><curses.h></STRONG>,
- can be used as a new video attribute. If a terminal is
- capable of redefining colors, the programmer can use the
- routine <STRONG>init_color</STRONG> to change the definition of a color.
- The routines <STRONG>has_colors</STRONG> and <STRONG>can_change_color</STRONG> return <STRONG>TRUE</STRONG>
- or <STRONG>FALSE</STRONG>, depending on whether the terminal has color ca-
- pabilities and whether the programmer can change the col-
- ors. The routine <STRONG>color_content</STRONG> allows a programmer to ex-
- tract the amounts of red, green, and blue components in an
- initialized color. The routine <STRONG>pair_content</STRONG> allows a pro-
- grammer to find out how a given color-pair is currently
- defined.
-
- <STRONG>Routine</STRONG> <STRONG>Descriptions</STRONG>
+ can be used as a new video attribute.
+
+ If a terminal is capable of redefining colors, the pro-
+ grammer can use the routine <STRONG>init_color</STRONG> to change the defi-
+ nition of a color. The routines <STRONG>has_colors</STRONG> and
+ <STRONG>can_change_color</STRONG> return <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>, depending on
+ whether the terminal has color capabilities and whether
+ the programmer can change the colors. The routine <STRONG>col-</STRONG>
+ <STRONG>or_content</STRONG> allows a programmer to extract the amounts of
+ red, green, and blue components in an initialized color.
+ The routine <STRONG>pair_content</STRONG> allows a programmer to find out
+ how a given color-pair is currently defined.
+
+
+</PRE>
+<H3><a name="h3-Routine-Descriptions">Routine Descriptions</a></H3><PRE>
The <STRONG>start_color</STRONG> routine requires no arguments. It must be
- called if the programmer wants to use colors, and before
- any other color manipulation routine is called. It is
- good practice to call this routine right after <STRONG>initscr</STRONG>.
- <STRONG>start_color</STRONG> initializes eight basic colors (black, red,
- green, yellow, blue, magenta, cyan, and white), and two
- global variables, <STRONG>COLORS</STRONG> and <STRONG>COLOR_PAIRS</STRONG> (respectively
- defining the maximum number of colors and color-pairs the
- terminal can support). It also restores the colors on the
- terminal to the values they had when the terminal was just
- turned on. The <STRONG>init_pair</STRONG> routine changes the definition
- of a color-pair. It takes three arguments: the number of
- the color-pair to be changed, the foreground color number,
- and the background color number. For portable applica-
- tions:
-
- - The value of the first argument must be between <STRONG>1</STRONG> and
- <STRONG>COLOR_PAIRS-1</STRONG>.
-
- - The value of the second and third arguments must be
- between 0 and <STRONG>COLORS</STRONG>. Color pair 0 is assumed to be
- white on black, but is actually whatever the terminal
- implements before color is initialized. It cannot be
- modified by the application.
+ called if the programmer wants to use colors, and before
+ any other color manipulation routine is called. It is
+ good practice to call this routine right after <STRONG>initscr</STRONG>.
+ <STRONG>start_color</STRONG> does this:
+
+ <STRONG>o</STRONG> It initializes two global variables, <STRONG>COLORS</STRONG> and <STRONG>COL-</STRONG>
+ <STRONG>OR_PAIRS</STRONG> (respectively defining the maximum number of
+ colors and color-pairs the terminal can support).
+
+ <STRONG>o</STRONG> It initializes the special color pair <STRONG>0</STRONG> to the default
+ foreground and background colors. No other color
+ pairs are initialized.
+
+ <STRONG>o</STRONG> It restores the colors on the terminal to the values
+ they had when the terminal was just turned on.
+
+ <STRONG>o</STRONG> If the terminal supports the <STRONG>initc</STRONG> (<STRONG>initialize_color</STRONG>)
+ capability, <STRONG>start_color</STRONG> initializes its internal table
+ representing the red, green and blue components of the
+ color palette.
+
+ The components depend on whether the terminal uses CGA
+ (aka "ANSI") or HLS (i.e., the <STRONG>hls</STRONG> (<STRONG>hue_lightness_sat-</STRONG>
+ <STRONG>uration</STRONG>) capability is set). The table is initialized
+ first for eight basic colors (black, red, green, yel-
+ low, blue, magenta, cyan, and white), and after that
+ (if the terminal supports more than eight colors) the
+ components are initialized to <STRONG>1000</STRONG>.
+
+ <STRONG>start_color</STRONG> does not attempt to set the terminal's
+ color palette to match its built-in table. An appli-
+ cation may use <STRONG>init_color</STRONG> to alter the internal table
+ along with the terminal's color.
+
+ These limits apply to color values and color pairs. Val-
+ ues outside these limits are not legal, and may result in
+ a runtime error:
+
+ <STRONG>o</STRONG> <STRONG>COLORS</STRONG> corresponds to the terminal database's <STRONG>max_col-</STRONG>
+ <STRONG>ors</STRONG> capability, which is typically a signed 16-bit in-
+ teger (see <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>).
+
+ <STRONG>o</STRONG> color values are expected to be in the range <STRONG>0</STRONG> to <STRONG>COL-</STRONG>
+ <STRONG>ORS-1</STRONG>, inclusive (including <STRONG>0</STRONG> and <STRONG>COLORS-1</STRONG>).
+
+ <STRONG>o</STRONG> a special color value <STRONG>-1</STRONG> is used in certain extended
+ functions to denote the <EM>default</EM> <EM>color</EM> (see <STRONG>use_de-</STRONG>
+ <STRONG>fault_colors</STRONG>).
+
+ <STRONG>o</STRONG> <STRONG>COLOR_PAIRS</STRONG> corresponds to the terminal database's
+ <STRONG>max_pairs</STRONG> capability, which is typically a signed
+ 16-bit integer (see <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>).
+
+ <STRONG>o</STRONG> legal color pair values are in the range <STRONG>1</STRONG> to <STRONG>COL-</STRONG>
+ <STRONG>OR_PAIRS-1</STRONG>, inclusive.
+
+ <STRONG>o</STRONG> color pair <STRONG>0</STRONG> is special; it denotes "no color".
+
+ Color pair <STRONG>0</STRONG> is assumed to be white on black, but is
+ actually whatever the terminal implements before color
+ is initialized. It cannot be modified by the applica-
+ tion.
+
+ The <STRONG>init_pair</STRONG> routine changes the definition of a color-
+ pair. It takes three arguments: the number of the color-
+ pair to be changed, the foreground color number, and the
+ background color number. For portable applications:
+
+ <STRONG>o</STRONG> The first argument must be a legal color pair value.
+ If default colors are used (see <STRONG>use_default_colors</STRONG>)
+ the upper limit is adjusted to allow for extra pairs
+ which use a default color in foreground and/or back-
+ ground.
+
+ <STRONG>o</STRONG> The second and third arguments must be legal color
+ values.
If the color-pair was previously initialized, the screen
is refreshed and all occurrences of that color-pair are
- changed to the new definition. As an extension, ncurses
- allows you to set color pair 0 via the <STRONG>assume_default_col-</STRONG>
- <STRONG>ors</STRONG> routine, or to specify the use of default colors (col-
- or number <STRONG>-1</STRONG>) if you first invoke the <STRONG>use_default_colors</STRONG>
- routine. The <STRONG>init_color</STRONG> routine changes the definition of
- a color. It takes four arguments: the number of the color
- to be changed followed by three RGB values (for the
- amounts of red, green, and blue components). The value of
- the first argument must be between <STRONG>0</STRONG> and <STRONG>COLORS</STRONG>. (See the
- section <STRONG>Colors</STRONG> for the default color index.) Each of the
- last three arguments must be a value between 0 and 1000.
- When <STRONG>init_color</STRONG> is used, all occurrences of that color on
- the screen immediately change to the new definition. The
- <STRONG>has_colors</STRONG> routine requires no arguments. It returns <STRONG>TRUE</STRONG>
- if the terminal can manipulate colors; otherwise, it re-
- turns <STRONG>FALSE</STRONG>. This routine facilitates writing terminal-
- independent programs. For example, a programmer can use
- it to decide whether to use color or some other video at-
- tribute. The <STRONG>can_change_color</STRONG> routine requires no argu-
- ments. It returns <STRONG>TRUE</STRONG> if the terminal supports colors
- and can change their definitions; other, it returns <STRONG>FALSE</STRONG>.
- This routine facilitates writing terminal-independent pro-
- grams. The <STRONG>color_content</STRONG> routine gives programmers a way
- to find the intensity of the red, green, and blue (RGB)
- components in a color. It requires four arguments: the
- color number, and three addresses of <STRONG>short</STRONG>s for storing
- the information about the amounts of red, green, and blue
- components in the given color. The value of the first ar-
- gument must be between 0 and <STRONG>COLORS</STRONG>. The values that are
- stored at the addresses pointed to by the last three argu-
- ments are between 0 (no component) and 1000 (maximum
- amount of component). The <STRONG>pair_content</STRONG> routine allows
- programmers to find out what colors a given color-pair
- consists of. It requires three arguments: the color-pair
- number, and two addresses of <STRONG>short</STRONG>s for storing the fore-
- ground and the background color numbers. The value of the
- first argument must be between 1 and <STRONG>COLOR_PAIRS-1</STRONG>. The
- values that are stored at the addresses pointed to by the
- second and third arguments are between 0 and <STRONG>COLORS</STRONG>.
-
- <STRONG>Colors</STRONG>
+ changed to the new definition.
+
+ As an extension, ncurses allows you to set color pair <STRONG>0</STRONG>
+ via the <STRONG>assume_default_colors</STRONG> routine, or to specify the
+ use of default colors (color number <STRONG>-1</STRONG>) if you first in-
+ voke the <STRONG>use_default_colors</STRONG> routine.
+
+ The <STRONG>init_color</STRONG> routine changes the definition of a color.
+ It takes four arguments: the number of the color to be
+ changed followed by three RGB values (for the amounts of
+ red, green, and blue components). The first argument must
+ be a legal color value; default colors are not allowed
+ here. (See the section <STRONG>Colors</STRONG> for the default color in-
+ dex.) Each of the last three arguments must be a value in
+ the range <STRONG>0</STRONG> through <STRONG>1000</STRONG>. When <STRONG>init_color</STRONG> is used, all
+ occurrences of that color on the screen immediately change
+ to the new definition.
+
+ The <STRONG>has_colors</STRONG> routine requires no arguments. It returns
+ <STRONG>TRUE</STRONG> if the terminal can manipulate colors; otherwise, it
+ returns <STRONG>FALSE</STRONG>. This routine facilitates writing terminal-
+ independent programs. For example, a programmer can use
+ it to decide whether to use color or some other video at-
+ tribute.
+
+ The <STRONG>can_change_color</STRONG> routine requires no arguments. It
+ returns <STRONG>TRUE</STRONG> if the terminal supports colors and can
+ change their definitions; other, it returns <STRONG>FALSE</STRONG>. This
+ routine facilitates writing terminal-independent programs.
+
+ The <STRONG>color_content</STRONG> routine gives programmers a way to find
+ the intensity of the red, green, and blue (RGB) components
+ in a color. It requires four arguments: the color number,
+ and three addresses of <STRONG>short</STRONG>s for storing the information
+ about the amounts of red, green, and blue components in
+ the given color. The first argument must be a legal color
+ value, i.e., <STRONG>0</STRONG> through <STRONG>COLORS-1</STRONG>, inclusive. The values
+ that are stored at the addresses pointed to by the last
+ three arguments are in the range <STRONG>0</STRONG> (no component) through
+ <STRONG>1000</STRONG> (maximum amount of component), inclusive.
+
+ The <STRONG>pair_content</STRONG> routine allows programmers to find out
+ what colors a given color-pair consists of. It requires
+ three arguments: the color-pair number, and two addresses
+ of <STRONG>short</STRONG>s for storing the foreground and the background
+ color numbers. The first argument must be a legal color
+ value, i.e., in the range <STRONG>1</STRONG> through <STRONG>COLOR_PAIRS-1</STRONG>, inclu-
+ sive. The values that are stored at the addresses pointed
+ to by the second and third arguments are in the range <STRONG>0</STRONG>
+ through <STRONG>COLORS</STRONG>, inclusive.
+
+
+</PRE>
+<H3><a name="h3-Colors">Colors</a></H3><PRE>
In <STRONG><curses.h></STRONG> the following macros are defined. These are
- the default colors. <STRONG>curses</STRONG> also assumes that <STRONG>COLOR_BLACK</STRONG>
+ the default colors. <STRONG>curses</STRONG> also assumes that <STRONG>COLOR_BLACK</STRONG>
is the default background color for all terminals.
+
<STRONG>COLOR_BLACK</STRONG>
<STRONG>COLOR_RED</STRONG>
<STRONG>COLOR_GREEN</STRONG>
</PRE>
-<H2>RETURN VALUE</H2><PRE>
- The routines <STRONG>can_change_color()</STRONG> and <STRONG>has_colors()</STRONG> return
- <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>. All other routines return the integer <STRONG>ERR</STRONG>
- upon failure and an <STRONG>OK</STRONG> (SVr4 specifies only "an integer
- value other than <STRONG>ERR</STRONG>") upon successful completion.
-
- X/Open defines no error conditions. This implementation
- will return <STRONG>ERR</STRONG> on attempts to use color values outside
- the range 0 to COLORS-1 (except for the default colors ex-
- tension), or use color pairs outside the range 0 to COL-
- OR_PAIR-1. Color values used in <STRONG>init_color</STRONG> must be in the
- range 0 to 1000. An error is returned from all functions
- if the terminal has not been initialized. An error is re-
- turned from secondary functions such as <STRONG>init_pair</STRONG> if
+<H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+ The routines <STRONG>can_change_color()</STRONG> and <STRONG>has_colors()</STRONG> return
+ <STRONG>TRUE</STRONG> or <STRONG>FALSE</STRONG>.
+
+ All other routines return the integer <STRONG>ERR</STRONG> upon failure and
+ an <STRONG>OK</STRONG> (SVr4 specifies only "an integer value other than
+ <STRONG>ERR</STRONG>") upon successful completion.
+
+ X/Open defines no error conditions. This implementation
+ will return <STRONG>ERR</STRONG> on attempts to use color values outside
+ the range <STRONG>0</STRONG> to COLORS-1 (except for the default colors ex-
+ tension), or use color pairs outside the range <STRONG>0</STRONG> to <STRONG>COL-</STRONG>
+ <STRONG>OR_PAIRS-1</STRONG>. Color values used in <STRONG>init_color</STRONG> must be in
+ the range <STRONG>0</STRONG> to <STRONG>1000</STRONG>. An error is returned from all func-
+ tions if the terminal has not been initialized. An error
+ is returned from secondary functions such as <STRONG>init_pair</STRONG> if
<STRONG>start_color</STRONG> was not called.
- <STRONG>init_color</STRONG>
- returns an error if the terminal does not sup-
- port this feature, e.g., if the <EM>initial-</EM>
- <EM>ize</EM><STRONG>_</STRONG><EM>color</EM> capability is absent from the termi-
- nal description.
+ <STRONG>init_color</STRONG>
+ returns an error if the terminal does not support
+ this feature, e.g., if the <EM>initialize</EM><STRONG>_</STRONG><EM>color</EM> capa-
+ bility is absent from the terminal description.
- <STRONG>start_color</STRONG>
- returns an error If the color table cannot be
- allocated.
+ <STRONG>start_color</STRONG>
+ returns an error if the color table cannot be al-
+ located.
</PRE>
+<H2>
<a name="h2-NOTES">NOTES</a></H2><PRE>
In the <EM>ncurses</EM> implementation, there is a separate color
activation flag, color palette, color pairs table, and as-
sociated COLORS and COLOR_PAIRS counts for each screen;
the <STRONG>start_color</STRONG> function only affects the current screen.
The SVr4/XSI interface is not really designed with this in
mind, and historical implementations may use a single
- shared color palette. Note that setting an implicit back-
- ground color via a color pair affects only character cells
- that a character write operation explicitly touches. To
- change the background color used when parts of a window
- are blanked by erasing or scrolling operations, see
- <STRONG><A HREF="curs_bkgd.3x.html">curs_bkgd(3x)</A></STRONG>. Several caveats apply on 386 and 486 ma-
- chines with VGA-compatible graphics:
+ shared color palette.
+
+ Note that setting an implicit background color via a color
+ pair affects only character cells that a character write
+ operation explicitly touches. To change the background
+ color used when parts of a window are blanked by erasing
+ or scrolling operations, see <STRONG><A HREF="curs_bkgd.3x.html">curs_bkgd(3x)</A></STRONG>.
+
+ Several caveats apply on 386 and 486 machines with VGA-
+ compatible graphics:
- - COLOR_YELLOW is actually brown. To get yellow, use
- COLOR_YELLOW combined with the <STRONG>A_BOLD</STRONG> attribute.
+ <STRONG>o</STRONG> COLOR_YELLOW is actually brown. To get yellow, use
+ COLOR_YELLOW combined with the <STRONG>A_BOLD</STRONG> attribute.
- - The A_BLINK attribute should in theory cause the
- background to go bright. This often fails to work,
- and even some cards for which it mostly works (such
- as the Paradise and compatibles) do the wrong thing
- when you try to set a bright "yellow" background (you
- get a blinking yellow foreground instead).
+ <STRONG>o</STRONG> The A_BLINK attribute should in theory cause the back-
+ ground to go bright. This often fails to work, and
+ even some cards for which it mostly works (such as the
+ Paradise and compatibles) do the wrong thing when you
+ try to set a bright "yellow" background (you get a
+ blinking yellow foreground instead).
- - Color RGB values are not settable.
+ <STRONG>o</STRONG> Color RGB values are not settable.
</PRE>
-<H2>
PORTABILITY</H2><PRE>
- This implementation satisfies XSI Curses's minimum maxi-
+<H2>
<a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ This implementation satisfies XSI Curses's minimum maxi-
mums for <STRONG>COLORS</STRONG> and <STRONG>COLOR_PAIRS</STRONG>.
- The <STRONG>init_pair</STRONG> routine accepts negative values of fore-
- ground and background color to support the <STRONG>use_de-</STRONG>
- <STRONG>fault_colors</STRONG> extension, but only if that routine has been
+ The <STRONG>init_pair</STRONG> routine accepts negative values of fore-
+ ground and background color to support the <STRONG>use_de-</STRONG>
+ <STRONG>fault_colors</STRONG> extension, but only if that routine has been
first invoked.
- The assumption that <STRONG>COLOR_BLACK</STRONG> is the default background
- color for all terminals can be modified using the <STRONG>as-</STRONG>
+ The assumption that <STRONG>COLOR_BLACK</STRONG> is the default background
+ color for all terminals can be modified using the <STRONG>as-</STRONG>
<STRONG>sume_default_colors</STRONG> extension.
- This implementation checks the pointers, e.g., for the
- values returned by <STRONG>color_content</STRONG> and <STRONG>pair_content</STRONG>, and
+ This implementation checks the pointers, e.g., for the
+ values returned by <STRONG>color_content</STRONG> and <STRONG>pair_content</STRONG>, and
will treat those as optional parameters when null.
</PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>, <STRONG>default_col-</STRONG>
- <STRONG><A HREF="default_colors.3x.html">ors(3x)</A></STRONG>
+<H2>
<a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>, <STRONG>curs_vari-</STRONG>
+ <STRONG><A HREF="curs_variables.3x.html">ables(3x)</A></STRONG>, <STRONG><A HREF="default_colors.3x.html">default_colors(3x)</A></STRONG>
<STRONG><A HREF="curs_color.3x.html">curs_color(3x)</A></STRONG>
</PRE>
-<HR>
-<ADDRESS>
-Man(1) output converted with
-<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
-</ADDRESS>
+<div class="nav">
+<ul>
+<li><a href="#h2-NAME">NAME</a></li>
+<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
+<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
+<ul>
+<li><a href="#h3-Overview">Overview</a></li>
+<li><a href="#h3-Routine-Descriptions">Routine Descriptions</a></li>
+<li><a href="#h3-Colors">Colors</a></li>
+</ul>
+</li>
+<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
+<li><a href="#h2-NOTES">NOTES</a></li>
+<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
+<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
+</ul>
+</div>
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