1XcmsQueryColor(3X11)            XLIB FUNCTIONS            XcmsQueryColor(3X11)
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NAME

6       XcmsQueryColor, XcmsQueryColors, XcmsLookupColor - obtain color values
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SYNTAX

9       Status XcmsQueryColor(Display *display, Colormap colormap, XcmsColor
10              *color_in_out, XcmsColorFormat result_format);
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12       Status XcmsQueryColors(Display *display, Colormap colormap, XcmsColor
13              colors_in_out[], unsigned int ncolors, XcmsColorFormat
14              result_format);
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16       Status XcmsLookupColor(Display *display, Colormap colormap, char
17              *color_string, XcmsColor *color_exact_return, XcmsColor
18              *color_screen_return, XcmsColorFormat result_format);
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ARGUMENTS

21       display   Specifies the connection to the X server.
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23       colormap  Specifies the colormap.
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25       color_exact_return
26                 Returns the color specification parsed from the color string
27                 or parsed from the corresponding string found in a color-name
28                 database.
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30       color_in_out
31                 Specifies the pixel member that indicates the color cell to
32                 query.  The color specification stored for the color cell is
33                 returned in this XcmsColor structure.
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35       color_screen_return
36                 Returns the color that can be reproduced on the screen.
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38       color_string
39                 Specifies the color string.
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41       result_format
42                 Specifies the color format for the returned color specifica‐
43                 tions (color_screen_return and color_exact_return arguments).
44                 If the format is XcmsUndefinedFormat and the color string
45                 contains a numerical color specification, the specification
46                 is returned in the format used in that numerical color speci‐
47                 fication.  If the format is XcmsUndefinedFormat and the color
48                 string contains a color name, the specification is returned
49                 in the format used to store the color in the database.
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51       ncolors   Specifies the number of XcmsColor structures in the color-
52                 specification array.
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DESCRIPTION

55       The XcmsQueryColor function obtains the RGB value for the pixel value
56       in the pixel member of the specified XcmsColor structure and then con‐
57       verts the value to the target format as specified by the result_format
58       argument.  If the pixel is not a valid index in the specified colormap,
59       a BadValue error results.  The XcmsQueryColors function obtains the RGB
60       values for pixel values in the pixel members of XcmsColor structures
61       and then converts the values to the target format as specified by the
62       result_format argument.  If a pixel is not a valid index into the spec‐
63       ified colormap, a BadValue error results.  If more than one pixel is in
64       error, the one that gets reported is arbitrary.
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66       XcmsQueryColor and XcmsQueryColors can generate BadColor and BadValue
67       errors.
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69       The XcmsLookupColor function looks up the string name of a color with
70       respect to the screen associated with the specified colormap.  It
71       returns both the exact color values and the closest values provided by
72       the screen with respect to the visual type of the specified colormap.
73       The values are returned in the format specified by result_format.  If
74       the color name is not in the Host Portable Character Encoding, the
75       result is implementation-dependent.  Use of uppercase or lowercase does
76       not matter.  XcmsLookupColor returns XcmsSuccess or XcmsSuccessWithCom‐
77       pression if the name is resolved; otherwise, it returns XcmsFailure.
78       If XcmsSuccessWithCompression is returned, the color specification
79       returned in color_screen_return is the result of gamut compression.
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DIAGNOSTICS

82       BadColor  A value for a Colormap argument does not name a defined Col‐
83                 ormap.
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85       BadValue  Some numeric value falls outside the range of values accepted
86                 by the request.  Unless a specific range is specified for an
87                 argument, the full range defined by the argument's type is
88                 accepted.  Any argument defined as a set of alternatives can
89                 generate this error.
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SEE ALSO

92       XcmsAllocColor(3X11), XcmsStoreColor(3X11), XQueryColor(3X11)
93       Xlib - C Language X Interface
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97X Version 11                     libX11 1.0.3             XcmsQueryColor(3X11)
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