1XcmsQueryColor(3) XLIB FUNCTIONS XcmsQueryColor(3)
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6 XcmsQueryColor, XcmsQueryColors, XcmsLookupColor - obtain color values
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9 Status XcmsQueryColor(Display *display, Colormap colormap, XcmsColor
10 *color_in_out, XcmsColorFormat result_format);
11 Status XcmsQueryColors(Display *display, Colormap colormap, XcmsColor
13 colors_in_out[], unsigned int ncolors, XcmsColorFormat
14 result_format);
15 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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21 display Specifies the connection to the X server.
22 colormap Specifies the colormap.
24 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.
29 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.
34 color_screen_return
36 Returns the color that can be reproduced on the screen.
37 color_string
39 Specifies the color string.
40 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.
50 ncolors Specifies the number of XcmsColor structures in the color-
52 specification array.
53
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.
65 XcmsQueryColor and XcmsQueryColors can generate BadColor and BadValue
67 errors.
68 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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82 BadColor A value for a Colormap argument does not name a defined Col‐
83 ormap.
84 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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92 XcmsAllocColor(3), XcmsStoreColor(3), XQueryColor(3)
93 Xlib - C Language X Interface
94X Version 11 libX11 1.3.4 XcmsQueryColor(3)