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/* $Xorg: LabGcC.c,v 1.3 2000/08/17 19:44:39 cpqbld Exp $ */
/*
* Code and supporting documentation (c) Copyright 1990 1991 Tektronix, Inc.
* All Rights Reserved
*
* This file is a component of an X Window System-specific implementation
* of XCMS based on the TekColor Color Management System. Permission is
* hereby granted to use, copy, modify, sell, and otherwise distribute this
* software and its documentation for any purpose and without fee, provided
* that this copyright, permission, and disclaimer notice is reproduced in
* all copies of this software and in supporting documentation. TekColor
* is a trademark of Tektronix, Inc.
*
* Tektronix makes no representation about the suitability of this software
* for any purpose. It is provided "as is" and with all faults.
*
* TEKTRONIX DISCLAIMS ALL WARRANTIES APPLICABLE TO THIS SOFTWARE,
* INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE. IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR THE PERFORMANCE OF THIS SOFTWARE.
*
* NAME
* CIELabGcC.c
*
* DESCRIPTION
* Source for XcmsCIELabClipuv() gamut compression routine.
*
*/
/* $XFree86: xc/lib/X11/LabGcC.c,v 1.3 2001/01/17 19:41:38 dawes Exp $ */
#include "Xlibint.h"
#include "Xcmsint.h"
extern Status _XcmsDIConvertColors();
/************************************************************************
* *
* PUBLIC ROUTINES *
* *
************************************************************************/
/*
* NAME
* XcmsCIELabClipab - Reduce the chroma for a hue and L*
*
* SYNOPSIS
*/
/* ARGSUSED */
Status
XcmsCIELabClipab (ccc, pColors_in_out, nColors, i, pCompressed)
XcmsCCC ccc;
XcmsColor *pColors_in_out;
unsigned int nColors;
unsigned int i;
Bool *pCompressed;
/*
* DESCRIPTION
* Reduce the Chroma for a specific hue and chroma to
* to bring the given color into the gamut of the
* specified device. As required of gamut compression
* functions, this routine returns pColor_in_out
* in XcmsCIEXYZFormat on successful completion.
*
* Since this routine works with the L* within
* pColor_in_out intermediate results may be returned
* even though it may be invalid.
*
* RETURNS
* XcmsFailure - Failure
* XcmsSuccess - Succeeded
*
*/
{
Status retval;
XcmsColor *pColor;
/*
* Color specification passed as input can be assumed to:
* 1. Be in XcmsCIEXYZFormat
* 2. Already be white point adjusted for the Screen White Point.
* This means that the white point now associated with this
* color spec is the Screen White Point (even if the
* ccc->clientWhitePt differs).
*/
pColor = pColors_in_out + i;
if (ccc->visual->class < PseudoColor) {
/*
* GRAY !
*/
_XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
1, XcmsCIELabFormat);
_XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
1, XcmsCIEXYZFormat);
if (pCompressed) {
*(pCompressed + i) = True;
}
return(XcmsSuccess);
} else {
if (pColor->format != XcmsCIELabFormat) {
if (_XcmsDIConvertColors(ccc, pColor,
&ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIELabFormat)
== XcmsFailure) {
return(XcmsFailure);
}
}
if (XcmsCIELabQueryMaxC(ccc,
degrees(XCMS_CIELAB_PMETRIC_HUE(pColor->spec.CIELab.a_star,
pColor->spec.CIELab.b_star)),
pColor->spec.CIELab.L_star,
pColor) == XcmsFailure) {
return(XcmsFailure);
}
retval = _XcmsDIConvertColors(ccc, pColor,
&ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
if (retval != XcmsFailure && pCompressed != NULL) {
*(pCompressed + i) = True;
}
return(retval);
}
}
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