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/*
* 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. TekColor is a
* trademark of Tektronix, Inc. The term "TekHVC" designates a particular
* color space that is the subject of U.S. Patent No. 4,985,853 (equivalent
* foreign patents pending). 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:
*
* 1. This copyright, permission, and disclaimer notice is reproduced in
* all copies of this software and any modification thereof and in
* supporting documentation;
* 2. Any color-handling application which displays TekHVC color
* cooordinates identifies these as TekHVC color coordinates in any
* interface that displays these coordinates and in any associated
* documentation;
* 3. The term "TekHVC" is always used, and is only used, in association
* with the mathematical derivations of the TekHVC Color Space,
* including those provided in this file and any equivalent pathways and
* mathematical derivations, regardless of digital (e.g., floating point
* or integer) representation.
*
* 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
* TekHVCGcC.c
*
* DESCRIPTION
* Source for XcmsTekHVCClipC() gamut compression routine.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "Xlibint.h"
#include "Xcmsint.h"
#include "Cv.h"
/************************************************************************
* *
* PUBLIC ROUTINES *
* *
************************************************************************/
/*
* NAME
* XcmsTekHVCClipC - Reduce the chroma for a hue and value
*
* SYNOPSIS
*/
/* ARGSUSED */
Status
XcmsTekHVCClipC (
XcmsCCC ccc,
XcmsColor *pColors_in_out,
unsigned int nColors,
unsigned int i,
Bool *pCompressed)
/*
* DESCRIPTION
* Reduce the Chroma for a specific hue and value to
* to bring the given color into the gamut of the
* specified device. As required of gamut compression
* functions in Xcms, this routine returns pColor_in_out
* in XcmsCIEXYZFormat on successful completion.
*
* Since this routine works with the value 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).
*/
/*
* Insure TekHVC installed
*/
if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) {
return(XcmsFailure);
}
pColor = pColors_in_out + i;
if (ccc->visual->class < StaticColor &&
FunctionSetOfCCC(ccc) != (XPointer) &XcmsLinearRGBFunctionSet) {
/*
* GRAY !
*/
_XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt,
1, XcmsTekHVCFormat);
pColor->spec.TekHVC.H = pColor->spec.TekHVC.C = 0.0;
_XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt,
1, XcmsCIEXYZFormat);
if (pCompressed) {
*(pCompressed + i) = True;
}
return(XcmsSuccess);
} else {
if (pColor->format != XcmsTekHVCFormat) {
if (_XcmsDIConvertColors(ccc, pColor,
&ccc->pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat)
== XcmsFailure) {
return(XcmsFailure);
}
}
if (XcmsTekHVCQueryMaxC(ccc,
pColor->spec.TekHVC.H,
pColor->spec.TekHVC.V,
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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