Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
COLOR(3)		   Library Functions Manual		      COLOR(3)

NAME
       cmap2rgb, cmap2rgba, rgb2cmap - colors and color	maps

SYNOPSIS
       #include	<u.h>
       #include	<libc.h>
       #include	<draw.h>

       int  rgb2cmap(int red, int green, int blue)

       int  cmap2rgb(int col)

       int  cmap2rgba(int col)

DESCRIPTION
       These  routines convert between `true color' red/green/blue triples and
       the Plan	9 color	map.  See color(7) for	a  description	of  RGBV,  the
       standard	color map.

       Rgb2cmap	 takes a trio of color values, scaled from 0 (no intensity) to
       255 (full intensity), and returns the index of the color	in RGBV	 clos-
       est to that represented by those	values.

       Cmap2rgb	 decomposes  the  color	of RGBV	index col and returns a	24-bit
       integer with the	low 8 bits representing	the blue  value,  the  next  8
       representing  green, and	the next 8 representing	red.  Cmap2rgba	decom-
       poses the color of RGBV index col and returns a 32-bit integer with the
       low 8 bits representing an alpha	value, defined to be 255, and the next
       8 representing blue, then green,	then red, as for cmap2rgba shifted  up
       8  bits.	  This 32-bit representation is	the format used	by draw(3) and
       memdraw(3) library routines that	take colors as arguments.

SOURCE
       /usr/local/plan9/src/libdraw

SEE ALSO
       graphics(3), allocimage(3), draw(3), image(7), color(7)

								      COLOR(3)

NAME | SYNOPSIS | DESCRIPTION | SOURCE | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=color&sektion=3x&manpath=FreeBSD+11.1-RELEASE+and+Ports>

home | help