.\"***************************************************************************
-.\" Copyright (c) 1998-2016,2017 Free Software Foundation, Inc. *
+.\" Copyright (c) 1998-2017,2018 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. *
.\"***************************************************************************
.\"
-.\" $Id: curs_color.3x,v 1.52 2017/11/18 23:47:37 tom Exp $
+.\" $Id: curs_color.3x,v 1.55 2018/07/28 22:15:59 tom Exp $
.TH curs_color 3X ""
.ie \n(.g .ds `` \(lq
.el .ds `` ``
\fBCOLOR_WHITE\fR
.fi
.PP
-Some terminals support more than the eight (8) \*(lqANSI\*(rq colors.
-There are no standard names for those additional colors.
+Some terminals support more than the eight (8) \*(``ANSI\*('' colors.
+There are no standard names for those additional colors.
.SH VARIABLES
.SS COLORS
is initialized by \fBstart_color\fP to the maximum number of colors
red, green and blue components of the color palette.
.IP
The components depend on whether the terminal uses
-CGA (aka \*(lqANSI\*(rq) or
+CGA (aka \*(``ANSI\*('') or
HLS (i.e., the \fBhls\fP (\fBhue_lightness_saturation\fP) capability is set).
The table is initialized first for eight basic colors
(black, red, green, yellow, blue, magenta, cyan, and white),
a special color value \fB\-1\fP is used in certain extended functions
to denote the \fIdefault color\fP (see \fBuse_default_colors\fP).
.bP
-\fBCOLOR_PAIRS\fP corresponds to the terminal database's \fBmax_pairs\fP capability,
+\fBCOLOR_PAIRS\fP corresponds to
+the terminal database's \fBmax_pairs\fP capability,
(see \fBterminfo\fR(\*n)).
.bP
legal color pair values are in the range \fB1\fP to \fBCOLOR_PAIRS\-1\fP,
.SS init_pair
.PP
The \fBinit_pair\fR routine changes the definition of a color-pair.
-It takes three arguments: the number of the color-pair to be changed, the foreground
+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:
.bP
.SS init_color
.PP
The \fBinit_color\fR routine changes the definition of a color.
-It takes four arguments: the number of the color to be changed followed by three RGB values
+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).
.bP
The first argument must be a legal color value;
.bP
The values that are stored at the addresses pointed to by the
last three arguments are in the range
-\fB0\fP (no component) through \fB1000\fP (maximum amount of component), inclusive.
+\fB0\fP (no component) through \fB1000\fP
+(maximum amount of component), inclusive.
.SS pair_content
.PP
The \fBpair_content\fR routine allows programmers to find out what colors a
or \fBFALSE\fR.
.PP
All other routines return the integer \fBERR\fR upon failure and an \fBOK\fR
-(SVr4 specifies only \*(lqan integer value other than \fBERR\fR\*(rq) upon successful
-completion.
+(SVr4 specifies only \*(``an integer value
+other than \fBERR\fR\*('') upon successful completion.
.PP
X/Open defines no error conditions.
This implementation will return \fBERR\fR on attempts to
use color values outside the range \fB0\fP to \fBCOLORS\fP\-1
(except for the default colors extension),
or use color pairs outside the range \fB0\fP to \fBCOLOR_PAIRS\-1\fP.
-Color values used in \fBinit_color\fP must be in the range \fB0\fP to \fB1000\fP.
+Color values used in \fBinit_color\fP must be
+in the range \fB0\fP to \fB1000\fP.
An error is returned from all functions
if the terminal has not been initialized.
An error is returned from secondary functions such as \fBinit_pair\fP
.RE
.SH NOTES
In the \fBncurses\fR implementation, there is a separate color activation flag,
-color palette, color pairs table, and associated \fBCOLORS\fP and \fBCOLOR_PAIRS\fP counts
+color palette, color pairs table,
+and associated \fBCOLORS\fP and \fBCOLOR_PAIRS\fP counts
for each screen; the \fBstart_color\fR function only affects the current
screen.
The SVr4/XSI interface is not really designed with this in mind, and
the background color used when parts of a window are blanked by erasing or
scrolling operations, see \fBcurs_bkgd\fR(3X).
.PP
-Several caveats apply on older x86 machines (e.g., i386, i486) with VGA-compatible graphics:
+Several caveats apply on older x86 machines
+(e.g., i386, i486) with VGA-compatible graphics:
.bP
COLOR_YELLOW is actually brown.
To get yellow, use COLOR_YELLOW combined with the \fBA_BOLD\fR attribute.
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
-\*(lqyellow\*(rq background (you get a blinking yellow foreground instead).
+\*(``yellow\*('' background (you get a blinking yellow foreground instead).
.bP
Color RGB values are not settable.
.SH PORTABILITY
projects / ncurses.git / blobdiff