XcmsQueryColor(3X11) XcmsQueryColor(3X11)
NAME
XcmsQueryColor, XcmsQueryColors, XcmsLookupColor - obtain color values
SYNOPSIS
Status XcmsQueryColor(display, colormap, color_in_out, result_format)
Display *display;
Colormap colormap;
XcmsColor *color_in_out;
XcmsColorFormat result_format;
Status XcmsQueryColors(display, colormap, colors_in_out, ncolors, result_format)
Display *display;
Colormap colormap;
XcmsColor colors_in_out[];
unsigned int ncolors;
XcmsColorFormat result_format;
Status XcmsLookupColor(display, colormap, color_string, color_exact_return, color_screen_return, result_format)
Display *display;
Colormap colormap;
char *color_string;
XcmsColor *color_exact_return;
XcmsColor *color_screen_return;
XcmsColorFormat result_format;
ARGUMENTS
Specifies the connection to the X server. Specifies the colormap. Returns the color specification parsed from the color string or parsed
from the corresponding string found in a color-name database. 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. Returns the color that can be reproduced on the screen.
Specifies the color stringSt. Specifies the color format for the returned color specifications (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 specification. 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. Specifies the number of XcmsColor struc-
tures 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
converts the value to the target format as specified by the result_format argument. If the pixel is not a valid index in the specified col-
ormap, 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 specified 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 col-
ormap. 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 XcmsSuccess-
WithCompression if the name is resolved; otherwise, it returns XcmsFailure. If XcmsSuccessWithCompression is returned, the color specifica-
tion returned in color_screen_return is the result of gamut compression.
DIAGNOSTICS
A value for a Colormap argument does not name a defined Colormap. 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
XcmsQueryColor(3X11)