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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
* TekHVCMnV.c
*
* DESCRIPTION
* Source for XcmsTekHVCQueryMinV gamut boundary querying routine.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "Xlibint.h"
#include "Xcmsint.h"
#include "Cv.h"
/*
* DEFINES
*/
#define EPS 0.001
/************************************************************************
* *
* PUBLIC ROUTINES *
* *
************************************************************************/
/*
* NAME
* XcmsTekHVCQueryMinV - Compute minimum value for hue and chroma
*
* SYNOPSIS
*/
Status
XcmsTekHVCQueryMinV (
XcmsCCC ccc,
XcmsFloat hue,
XcmsFloat chroma,
XcmsColor *pColor_return)
/*
* DESCRIPTION
* Return the minimum value for a specific hue, and the
* corresponding chroma. The input color specification
* may be in any format, however output is in XcmsTekHVCFormat.
*
* Since this routine works with the value within
* pColor_return intermediate results may be returned
* even though it may be invalid.
*
* ASSUMPTIONS
* This routine assumes that the white point associated with
* the color specification is the Screen White Point. The
* Screen White Point will also be associated with the
* returned color specification.
*
* RETURNS
* XcmsFailure - Failure
* XcmsSuccess - Succeeded with no modifications
*
*/
{
XcmsCCCRec myCCC;
XcmsColor tmp;
XcmsColor max_vc;
/*
* Check Arguments
*/
if (ccc == NULL || pColor_return == NULL) {
return(XcmsFailure);
}
/*
* Insure TekHVC installed
*/
if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) {
return(XcmsFailure);
}
/* Use my own CCC */
memcpy ((char *)&myCCC, (char *)ccc, sizeof(XcmsCCCRec));
myCCC.clientWhitePt.format = XcmsUndefinedFormat;/* inherit screen white pt */
myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut comp func */
tmp.spec.TekHVC.H = hue;
tmp.spec.TekHVC.V = 100.0;
tmp.spec.TekHVC.C = chroma;
tmp.pixel = pColor_return->pixel;
tmp.format = XcmsTekHVCFormat;
/* Check for a valid HVC */
if (!_XcmsTekHVC_CheckModify (&tmp)) {
return(XcmsFailure);
}
/* Step 1: compute the maximum value and chroma for this hue. */
/* This copy may be overkill but it preserves the pixel etc. */
memcpy((char *)&max_vc, (char *)&tmp, sizeof(XcmsColor));
if (_XcmsTekHVCQueryMaxVCRGB (&myCCC, max_vc.spec.TekHVC.H, &max_vc,
(XcmsRGBi *)NULL) == XcmsFailure) {
return(XcmsFailure);
}
/* Step 2: find the intersection with the maximum hvc and chroma line. */
if (tmp.spec.TekHVC.C > max_vc.spec.TekHVC.C + EPS) {
/* If the chroma is to large then return maximum hvc. */
tmp.spec.TekHVC.C = max_vc.spec.TekHVC.C;
tmp.spec.TekHVC.V = max_vc.spec.TekHVC.V;
} else {
tmp.spec.TekHVC.V = tmp.spec.TekHVC.C *
max_vc.spec.TekHVC.V / max_vc.spec.TekHVC.C;
if (tmp.spec.TekHVC.V > max_vc.spec.TekHVC.V) {
tmp.spec.TekHVC.V = max_vc.spec.TekHVC.V;
} else if (tmp.spec.TekHVC.V < 0.0) {
tmp.spec.TekHVC.V = tmp.spec.TekHVC.C = 0.0;
}
}
if (_XcmsTekHVC_CheckModify (&tmp)) {
memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
return(XcmsSuccess);
} else {
return(XcmsFailure);
}
}
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