XcmsAllocColor, XcmsAllocNamedColor - allocate colors
Status XcmsAllocColor(Display *display, Colormap
    colormap, XcmsColor *color_in_out, XcmsColorFormat
    result_format);
Status XcmsAllocNamedColor(Display *display, Colormap
    colormap, _Xconst char *color_string, XcmsColor
    *color_screen_return, XcmsColor *color_exact_return,
    XcmsColorFormat result_format);
  - 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 color to allocate and returns the pixel and color that is
      actually used in the colormap.
- color_screen_return
- Returns the pixel value of the color cell and color specification that
      actually is stored for that cell.
- color_string
- Specifies the color string whose color definition structure is to be
      returned.
- result_format
- Specifies the color format for the returned color specification.
The XcmsAllocColor function is similar to XAllocColor except the
  color can be specified in any format. The XcmsAllocColor function
  ultimately calls XAllocColor to allocate a read-only color cell
  (colormap entry) with the specified color. XcmsAllocColor first
  converts the color specified to an RGB value and then passes this to
  XAllocColor. XcmsAllocColor returns the pixel value of the color
  cell and the color specification actually allocated. This returned color
  specification is the result of converting the RGB value returned by
  XAllocColor into the format specified with the result_format argument.
  If there is no interest in a returned color specification, unnecessary
  computation can be bypassed if result_format is set to XcmsRGBFormat.
  The corresponding colormap cell is read-only. If this routine returns
  XcmsFailure, the color_in_out color specification is left unchanged.XcmsAllocColor can generate a BadColor errors.
The XcmsAllocNamedColor function is similar to
    XAllocNamedColor except that the color returned can be in any format
    specified. This function ultimately calls XAllocColor to allocate a
    read-only color cell with the color specified by a color string. The color
    string is parsed into an XcmsColor structure (see
    XcmsLookupColor), converted to an RGB value, and finally passed to
    XAllocColor. 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.
This function returns both the color specification as a result of
    parsing (exact specification) and the actual color specification stored
    (screen specification). This screen specification is the result of
    converting the RGB value returned by XAllocColor into the format
    specified in result_format. If there is no interest in a returned color
    specification, unnecessary computation can be bypassed if result_format is
    set to XcmsRGBFormat. If color_screen_return and color_exact_return
    point to the same structure, the pixel field will be set correctly, but the
    color values are undefined.
XcmsAllocNamedColor can generate a BadColor
  errors.
  - BadColor
- A value for a Colormap argument does not name a defined Colormap.
XcmsQueryColor(3), XcmsStoreColor(3)
Xlib - C Language X Interface