XQueryColor(3X11)                    BSD                     XQueryColor(3X11)



NAME
     XQueryColor, XQueryColors, XLookupColor - obtain color values

SYNTAX
     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.

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