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XcmsQueryColor(3) XLIB FUNCTIONS XcmsQueryColor(3)
NAME
XcmsQueryColor, XcmsQueryColors, XcmsLookupColor - obtain color values
SYNTAX
Status XcmsQueryColor(Display *display, Colormap colormap, XcmsColor *color_in_out, Xcms-
ColorFormat 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_for-
mat);
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 specifications
(color_screen_return and color_exact_return arguments). If the format is Xcm-
sUndefinedFormat 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 converts the value to the target format as
specified by the result_format argument. If the pixel is not a valid index in the speci-
fied 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 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
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-depen-
dent. Use of uppercase or lowercase does not matter. XcmsLookupColor returns XcmsSuccess
or XcmsSuccessWithCompression 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 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
XcmsAllocColor(3), XcmsStoreColor(3), XQueryColor(3)
Xlib - C Language X Interface
X Version 11 libX11 1.6.7 XcmsQueryColor(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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