XcmsQueryColor(3)

NAME

       XcmsQueryColor, XcmsQueryColors, XcmsLookupColor - obtain color values

SYNTAX

       Status XcmsQueryColor(Display *display, Colormap colormap, XcmsColor
              *color_in_out, XcmsColorFormat result_format);

       Status XcmsQueryColors(Display *display, Colormap colormap, XcmsColor
              colors_in_out[], unsigned int ncolors, XcmsColorFormat
              result_format);

       Status XcmsLookupColor(Display *display, Colormap colormap, char
              *color_string, XcmsColor *color_exact_return, XcmsColor
              *color_screen_return, XcmsColorFormat result_format);

ARGUMENTS

       display   Specifies the connection to the X server.

       colormap  Specifies the colormap.

       color_exact_return
                 Returns the color specification parsed from the color string
                 or parsed from the corresponding string found in a color-name
                 database.

       color_in_out
                 Specifies the pixel member that indicates the color cell to
                 query.  The color specification stored for the color cell is
                 returned in this XcmsColor structure.

       color_screen_return
                 Returns the color that can be reproduced on the screen.

       color_string
                 Specifies the color string.

       result_format
                 Specifies the color format for the returned color specifica-
                 tions (color_screen_return and color_exact_return arguments).
                 If the format is XcmsUndefinedFormat and the color string
                 contains a numerical color specification, the specification
                 is returned in the format used in that numerical color speci-
                 fication.  If the format is XcmsUndefinedFormat and the color
                 string contains a color name, the specification is returned
                 in the format used to store the color in the database.

       ncolors   Specifies the number of XcmsColor structures in the color-
                 specification array.

DESCRIPTION

       The XcmsQueryColor function obtains the RGB value for the pixel value
       in the pixel member of the specified XcmsColor structure and then con-
       verts the value to the target format as specified by the result_format
       argument.  If the pixel is not a valid index in the specified colormap,
       a BadValue error results.  The XcmsQueryColors function obtains the RGB
       values for pixel values in the pixel members of XcmsColor structures
       and then converts the values to the target format as specified by the
       result_format argument.  If a pixel is not a valid index into the spec-
       ified colormap, a BadValue error results.  If more than one pixel is in
       error, the one that gets reported is arbitrary.

       XcmsQueryColor and XcmsQueryColors can generate BadColor and BadValue
       errors.

       The XcmsLookupColor 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.
       The values are returned in the format specified by result_format.  If
       the color name is not in the Host Portable Character Encoding, the
       result is implementation-dependent.  Use of uppercase or lowercase does
       not matter.  XcmsLookupColor returns XcmsSuccess or XcmsSuccessWithCom-
       pression if the name is resolved; otherwise, it returns XcmsFailure.
       If XcmsSuccessWithCompression is returned, the color specification
       returned in color_screen_return is the result of gamut compression.

DIAGNOSTICS

       BadColor  A value for a Colormap argument does not name a defined Col-
                 ormap.

       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

       XcmsAllocColor(3X11), XcmsStoreColor(3X11), XQueryColor(3X11)
       Xlib - C Language X Interface

X Version 11                     libX11 1.1.1                XcmsQueryColor(3)