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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
* TekHVCMxVs.c
*
* DESCRIPTION
* Source for the XcmsTekHVCQueryMaxVSamples() gamut boundary
* querying routine.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "Xlibint.h"
#include "Xcmsint.h"
#include "Cv.h"
/************************************************************************
* *
* PUBLIC ROUTINES *
* *
************************************************************************/
/*
* NAME
* XcmsTekHVCQueryMaxVSamples - Compute a set of value/chroma
* pairs.
*
* SYNOPSIS
*/
Status
XcmsTekHVCQueryMaxVSamples(
XcmsCCC ccc,
XcmsFloat hue,
XcmsColor *pColor_in_out,
unsigned int nSamples)
/*
* DESCRIPTION
* Return a set of values and chromas for the input Hue.
* This routine will take any color as input.
* It returns TekHVC colors.
*
* Since this routine works with the value within
* pColor_in_out 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
*
*/
{
XcmsCCCRec myCCC;
XcmsColor *pHVC;
XcmsRGBi rgb_saved;
unsigned short nI;
XcmsFloat nT;
/*
* Check Arguments
*/
if (ccc == NULL || pColor_in_out == NULL || nSamples == 0) {
return(XcmsFailure);
}
/*
* Insure TekHVC installed
*/
if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) {
return(XcmsFailure);
}
/* setup the CCC to use for the conversions. */
memcpy ((char *) &myCCC, (char *) ccc, sizeof(XcmsCCCRec));
myCCC.clientWhitePt.format = XcmsUndefinedFormat;
myCCC.gamutCompProc = (XcmsCompressionProc) NULL;
/* Step 1: compute the maximum value and chroma for this hue. */
/* save the Hue for use later. */
while (hue < 0.0) {
hue += 360.0;
}
while (hue > 360.0) {
hue -= 360.0;
}
pColor_in_out->spec.TekHVC.H = hue;
pColor_in_out->format = XcmsTekHVCFormat;
/* Get the maximum value and chroma point for this hue */
if (_XcmsTekHVCQueryMaxVCRGB(&myCCC, pColor_in_out->spec.TekHVC.H,
pColor_in_out, (XcmsRGBi *)&rgb_saved) == XcmsFailure) {
return (XcmsFailure);
}
/* Step 2: Convert each of the RGBi's to HVC's */
pHVC = pColor_in_out;
for (nI = 0; nI < nSamples; nI++, pHVC++) {
nT = (XcmsFloat) nI / (XcmsFloat) nSamples;
pHVC->spec.RGBi.red = rgb_saved.red * (1.0 - nT) + nT;
pHVC->spec.RGBi.green = rgb_saved.green * (1.0 - nT) + nT;
pHVC->spec.RGBi.blue = rgb_saved.blue * (1.0 - nT) + nT;
pHVC->format = XcmsRGBiFormat;
pHVC->pixel = pColor_in_out->pixel;
/* convert from RGB to HVC */
if (_XcmsConvertColorsWithWhitePt(&myCCC, pHVC,
&myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat,
(Bool *) NULL) == XcmsFailure) {
return(XcmsFailure);
}
/* make sure to return the input hue */
pHVC->spec.TekHVC.H = hue;
}
return(XcmsSuccess);
}
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