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+<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>curses</STRONG>
+ color manipulation routines
+
+
+</PRE>
+<H2>SYNOPSIS</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>
+ <STRONG>bool</STRONG> <STRONG>has_colors(void);</STRONG>
+ <STRONG>bool</STRONG> <STRONG>can_change_color(void);</STRONG>
+ <STRONG>int</STRONG> <STRONG>color_content(short</STRONG> <STRONG>color,</STRONG> <STRONG>short</STRONG> <STRONG>*r,</STRONG> <STRONG>short</STRONG> <STRONG>*g,</STRONG> <STRONG>short</STRONG>
+ <STRONG>*b);</STRONG>
+ <STRONG>int</STRONG> <STRONG>pair_content(short</STRONG> <STRONG>pair,</STRONG> <STRONG>short</STRONG> <STRONG>*f,</STRONG> <STRONG>short</STRONG> <STRONG>*b);</STRONG>
+
+
+</PRE>
+<H2>DESCRIPTION</H2><PRE>
+ <STRONG>Overview</STRONG>
+ <STRONG>curses</STRONG> support color attributes on terminals with that
+ capability. To use these routines <STRONG>start_color</STRONG> must be
+ called, usually right after <STRONG>initscr</STRONG>. Colors are always
+ used in pairs (referred to as color-pairs). A color-pair
+ consists of a foreground color (for characters) and a
+ background color (for the blank field on which the charac-
+ 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 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>color_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.
+
+ <STRONG>Routine</STRONG> <STRONG>Descriptions</STRONG>
+ 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.
+
+ pair to be changed, the foreground color number, and the
+ background color number. 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>
+ (the 0 color pair is wired to white on black and cannot be
+ changed). If the color-pair was previously initialized,
+ the screen is refreshed and all occurrences of that color-
+ pair is changed to the new definition.
+
+ 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
+ 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
+ attribute.
+
+ 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 value of the first argument must be
+ between 0 and <STRONG>COLORS</STRONG>. The values that are stored at the
+ addresses pointed to by the last three arguments are
+ between 0 (no component) and 1000 (maximum amount of com-
+ ponent).
+
+ 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 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 argu-
+ ments are between 0 and <STRONG>COLORS</STRONG>.
+
+ <STRONG>Colors</STRONG>
+ is the default background color for all terminals.
+
+ <STRONG>COLOR_BLACK</STRONG>
+ <STRONG>COLOR_RED</STRONG>
+ <STRONG>COLOR_GREEN</STRONG>
+ <STRONG>COLOR_YELLOW</STRONG>
+ <STRONG>COLOR_BLUE</STRONG>
+ <STRONG>COLOR_MAGENTA</STRONG>
+ <STRONG>COLOR_CYAN</STRONG>
+ <STRONG>COLOR_WHITE</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.
+
+
+</PRE>
+<H2>NOTES</H2><PRE>
+ In the <EM>ncurses</EM> implementation, there is a separate color
+ activation flag, color palette, color pairs table, and
+ associated 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 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.
+
+ 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.
+
+
+</PRE>
+<H2>PORTABILITY</H2><PRE>
+ This implementation satisfies XSI Curses's minimum maxi-
+ mums for <STRONG>COLORS</STRONG> and <STRONG>COLOR_PAIRS</STRONG>.
+ ground and background color to support the
+ <STRONG>use_default_colors</STRONG> extension, but only if that routine has
+ been first invoked.
+
+
+</PRE>
+<H2>SEE ALSO</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><A HREF="dft_fgbg.3x.html">dft_fgbg(3X)</A></STRONG>
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projects / ncurses.git / blobdiff