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-
-
-
- start_color, init_pair, init_color, has_colors,
- can_change_color, color_content, pair_content - curses
- color manipulation routines
-
-
-
-SYNOPSIS
- # include
- int start_color(void);
- int init_pair(short pair, short f, short b);
- int init_color(short color, short r, short g, short b);
- bool has_colors(void);
- bool can_change_color(void);
- int color_content(short color, short *r, short *g, short
- *b);
- int pair_content(short pair, short *f, short *b);
-
-
-
-DESCRIPTION
- Overview
- curses support color attributes on terminals with that
- capability. To use these routines start_color must be
- called, usually right after initscr. 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 init_pair. After it has been ini-
- tialized, COLOR_PAIR(n), a macro defined in ,
- can be used as a new video attribute.
-
- If a terminal is capable of redefining colors, the pro-
- grammer can use the routine init_color to change the defi-
- nition of a color. The routines has_colors and
- can_change_color return TRUE or FALSE, depending on
- whether the terminal has color capabilities and whether
- the programmer can change the colors. The routine
- color_content allows a programmer to extract the amounts
- of red, green, and blue components in an initialized
- color. The routine pair_content allows a programmer to
- find out how a given color-pair is currently defined.
-
- Routine Descriptions
- The start_color 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 initscr.
- start_color initializes eight basic colors (black, red,
- green, yellow, blue, magenta, cyan, and white), and two
- global variables, COLORS and COLOR_PAIRS (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 1 and COLOR_PAIRS-1. The value of the
- second and third arguments must be between 0 and COLORS
- (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 init_color 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 0 and COLORS. (See the section
- Colors for the default color index.) Each of the last
- three arguments must be a value between 0 and 1000. When
- init_color is used, all occurrences of that color on the
- screen immediately change to the new definition.
-
- The has_colors routine requires no arguments. It returns
- TRUE if the terminal can manipulate colors; otherwise, it
- returns FALSE. 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 can_change_color routine requires no arguments. It
- returns TRUE if the terminal supports colors and can
- change their definitions; other, it returns FALSE. This
- routine facilitates writing terminal-independent programs.
-
- The color_content 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 shorts 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 COLORS. 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 pair_content 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 shorts for storing the foreground and the background
- color numbers. The value of the first argument must be
- between 1 and COLOR_PAIRS-1. The values that are stored
- at the addresses pointed to by the second and third argu-
- ments are between 0 and COLORS.
-
- Colors
- is the default background color for all terminals.
-
- COLOR_BLACK
- COLOR_RED
- COLOR_GREEN
- COLOR_YELLOW
- COLOR_BLUE
- COLOR_MAGENTA
- COLOR_CYAN
- COLOR_WHITE
-
-
-
-RETURN VALUE
- The routines can_change_color() and has_colors() return
- TRUE or FALSE.
-
- All other routines return the integer ERR upon failure and
- an OK (SVr4 specifies only "an integer value other than
- ERR") upon successful completion.
-
-
-
-NOTES
- In the ncurses implementation, there is a separate color
- activation flag, color palette, color pairs table, and
- associated COLORS and COLOR_PAIRS counts for each screen;
- the start_color 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 curs_bkgd(3X).
-
- 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 A_BOLD 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.
-
-
-
-PORTABILITY
- This implementation satisfies XSI Curses's minimum maxi-
- mums for COLORS and COLOR_PAIRS.
- ground and background color to support the
- use_default_colors extension, but only if that routine has
- been first invoked.
-
-
-
-SEE ALSO
- curses(3X), curs_initscr(3X), curs_attr(3X), dft_fgbg(3X)
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