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XcmsSetCompressionProc()			      XcmsSetCompressionProc()

Name
  XcmsSetCompressionProc  –  change  the gamut compression procedure in a
  specified Color Conversion Context.

Synopsis
  XcmsCompressionProc XcmsSetCompressionProc(ccc, compression_proc,
  client_data)
	   XcmsCCC ccc;
	   XcmsCompressionProc compression_proc;
	   XPointer client_data;

Arguments
  ccc	    Specifies the color conversion context.

  compression_proc
	    Specifies the gamut compression procedure  to  apply  when	a
	    color  lies	 outside the screen's color gamut.  If NULL, when
	    functions using this CCC must convert a  color  specification
	    to	a device-dependent format and they encounter a color that
	    lies outside the screen's color  gamut,  the  functions  will
	    return XcmsFailure.

  client_data
	    Specifies  client data for the gamut compression procedure or
	    NULL.

Returns
  The previous compression procedure.

Availability
  Release 5 and later.

Description
  XcmsSetCompressionProc() function sets the gamut compression	procedure
  and client data in the specified CCC with the newly specified procedure
  and client data, and returns the old procedure.

  Gamut compression procedures provided with Xlib and  intended	 for  use
  with XcmsSetCompressionProc() are:

  ·  XcmsCIELabClipL  –	 In  CIELAB color space, reduces or increases the
     CIE metric lightness (L*) of the color  specification  until  it  is
     within the screen's color gamut.  No client data is necessary.

  ·  XcmsCIELabClipab – In CIELAB color space while maintaining Psychome‐
     tric Hue Angle, reduces the Psychometric Chroma of the color  speci‐
     fication  until  it  is  within the screen's color gamut.	No client
     data is necessary.

  ·  XcmsCIELabClipLab – In CIELAB color space while maintaining  Psycho‐
     metric  Hue  Angle, replaces the color specification with the CIELAB
     coordinate that falls within the screen's color gamut and whose vec‐
     tor  to  the  original  coordinates  is the shortest attainable.  No
     client data is necessary.

  ·  XcmsCIELuvClipL – In CIELUV color space, reduces  or  increases  the
     CIE  metric  lightness  (L*)  of the color specification until it is
     within the screen's color gamut.  No client data is necessary.

  ·  XcmsCIELuvClipuv – In CIELUV color space while maintaining Psychome‐
     tric  Hue Angle, reduces the Psychometric Chroma of the color speci‐
     fication until it is within the screen's  color  gamut.   No  client
     data is necessary.

  ·  XcmsCIELuvClipLuv	– In CIELUV color space while maintaining Psycho‐
     metric Hue Angle, replaces the color specification with  the  CIELuv
     coordinate that falls within the screen's color gamut and whose vec‐
     tor to the original coordinates  is  the  shortest	 attainable.   No
     client data is necessary.

  ·  XcmsTekHVCClipV  –	 In  TekHVC color space, reduces or increases the
     Value of the color specification until it	is  within  the	 screen's
     color gamut.  No client data is necessary.

  ·  XcmsTekHVCClipC  –	 In  TekHVC  color  space  while maintaining Hue,
     reduces the Chroma of the color specification until it is within the
     screen's color gamut.  No client data is necessary.

  ·  XcmsTekHVCClipVC  –  In  TekHVC  color  space while maintaining Hue,
     replaces the color specification with  the	 TekHVC	 coordinate  that
     falls within the screen's color gamut and whose vector to the origi‐
     nal coordinates is the shortest attainable.  No client data is  nec‐
     essary.

See Also
  XcmsCCCOfColormap(), XcmsCreateCCC(), XcmsConvertColors(), XcmsDefault‐
  CCC(),  XcmsScreenNumberOfCCC(),   XcmsScreenWhitePointOfCCC(),   Xcms‐
  SetWhiteAdjustProc(), XcmsSetWhitePoint().

Xlib - Device-independent Color			      XcmsSetCompressionProc()

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