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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, XcmsColorFormat result_format); Status XcmsQueryColors(Display *display, Colormap colormap, XcmsColor col- ors_in_out[], unsigned int ncolors, XcmsColorFormat result_format); Status XcmsLookupColor(Display *display, Colormap colormap, _Xconst char *color_string, XcmsColor *color_exact_return, XcmsColor *color_screen_return, XcmsColorFormat result_format); 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 data- base. color_in_out Specifies the pixel member that indicates the color cell to query. The color specification stored for the color cell is re- turned 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 XcmsUndefinedFormat and the color string contains a nu- merical 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. ncolors Specifies the number of XcmsColor structures in the color-speci- fication 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 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 er- rors. The XcmsLookupColor function looks up the string name of a color with re- spect 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- dependent. 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 re- turned, the color specification returned in color_screen_return is the re- sult 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 argu- ment, 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 1.8.13 XcmsQueryColor(3)
NAME | SYNTAX | ARGUMENTS | DESCRIPTION | DIAGNOSTICS | SEE ALSO
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