XQueryColor(3X11)       COMMAND REFERENCE       XQueryColor(3X11)



NAME
     XQueryColor, XQueryColors, XLookupColor - obtain color
     values

SYNOPSIS
     XQueryColor(display, colormap, def_in_out)
           Display *display;
           Colormap colormap;
           XColor *def_in_out;

     XQueryColors(display, colormap, defs_in_out, ncolors)
           Display *display;
           Colormap colormap;
           XColor defs_in_out[];
           int ncolors;

     Status XLookupColor(display, colormap, color_name,
     exact_def_return, screen_def_return)
           Display *display;
           Colormap colormap;
           char *color_name;
           XColor *exact_def_return, *screen_def_return;

ARGUMENTS
     colormap  Specifies the colormap.

     color_name
               Specifies the color name string (for example, red)
               whose color definition structure you want
               returned.

     def_in_out
               Specifies and returns the RGB values for the pixel
               specified in the structure.

     defs_in_out
               Specifies and returns an array of color definition
               structures for the pixel specified in the
               structure.

     display   Specifies the connection to the X server.

     exact_def_return
               Returns the exact RGB values.

     ncolors   Specifies the number of XColor structures in the
               color definition array.

     screen_def_return
               Returns the closest RGB values provided by the
               hardware.




X Version 11            1 September 1988                        1

XQueryColor(3X11)       COMMAND REFERENCE       XQueryColor(3X11)



DESCRIPTION
     The XQueryColor function returns the RGB values for each
     pixel in the XColor structures and sets the DoRed, DoGreen,
     and DoBlue flags.  The XQueryColors function returns the RGB
     values for each pixel in the XColor structures and sets the
     DoRed, DoGreen, and DoBlue flags.

     XQueryColor and XQueryColors can generate BadColor and
     BadValue errors.

     The XLookupColor function looks up the string name of a
     color with respect to the screen associated with the
     specified colormap.  It returns both the exact color values
     and the closest values provided by the screen with respect
     to the visual type of the specified colormap.  You should
     use the ISO Latin-1 encoding; uppercase and lowercase do not
     matter.  XLookupColor returns nonzero if the name existed in
     the color database or zero if it did not exist.

DIAGNOSTICS
     BadColor  A value for a Colormap argument does not name a
               defined Colormap.

     BadValue  Some numeric value falls outside the range of
               values accepted by the request.  Unless a specific
               range is specified for an argument, the full range
               defined by the argument's type is accepted.  Any
               argument defined as a set of alternatives can
               generate this error.

SEE ALSO
     XAllocColor(3x11), XCreateColormap(3x11), XStoreColors(3x11)
     Xlib - C Language X Interface






















X Version 11            1 September 1988                        2

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