XcmsLookupColor − obtain color values from a string.
Synopsis
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
displaySpecifies the connection to the X server.
colormapSpecifies the colormap.
color_string
Specifies the color string.
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_screen_return
Returns the color that can be reproduced on the Screen.
result_format
Specifies the desired color format for the returned color specifications.
Availability
Release 5 and later.
Description
The XcmsLookupColor() function looks up the string name of a color with respect to the screen associated with the specified colormap, but does not store the color into any color cell in the color map. 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. The color string may contain a color name that appears in the client-side or X server’s color database; or a numerical color specification for any color management supported color spaces such that the string conforms to the uniform syntax:
<color_space>:<color_space_specific_encoding> For example:
RGB:red/green/blue
RGBi:R/G/B
CIEXYZ:X/Y/Z
CIEuvY:u/v/Y
CIExyY:x/y/Y
CIELab:L/a/b
CIELuv:L/u/v
TekHVC:H/V/C
For the RGB color space, the red, green, and blue parameters are hexadecimal strings of one to four digits. For each of the other color spaces, each parameter is a floating-point number in standard string format. In each case, each number specifies a value for one of the parameters of the color space. Old-style RGB color strings beginning with a "#" remain supported for backwards compatibility. If the color name is not in the Host Portable Character Encoding the result is implementation-dependent. Color names are case-insensitive. If 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 format is XcmsUndefinedFormat and the color string contains a color name, the specification is returned in the format used in the color name database entry for that color name. XcmsLookupColor() returns XcmsSuccess or XcmsSuccessWithCompression if the name is resolved, otherwise it returns XcmsFailure. If XcmsSuccessWithCompression is returned, then the color specification in color_screen_return is the result of gamut compression.
Structures
The XcmsColor and XcmsColorFormat structures are shown on the XcmsColor reference page.
See Also
XcmsAllocColor(), XcmsLookupColor(), XcmsQueryColor(), XcmsQueryColors(), XcmsStoreColor(), XcmsStoreColors(), XAllocColor(), XLookupColor(), XParseColor(), XQueryColor(), XQueryColors(), XStoreColor(), XStoreColors().
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