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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
- * TekHVCMxC.c
- *
- * DESCRIPTION
- * Source for the XcmsTekHVCQueryMaxC() gamut boudary
- * querying routine.
- *
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include "Xlibint.h"
-#include "Xcmsint.h"
-#include <math.h>
-#include "Cv.h"
-
-/*
- * DEFINES
- */
-#define MAXBISECTCOUNT 100
-#define EPS 0.001
-
-
-/************************************************************************
- * *
- * PUBLIC ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * XcmsTekHVCQueryMaxC - Compute the maximum chroma for a hue and value
- *
- * SYNOPSIS
- */
-Status
-XcmsTekHVCQueryMaxC(
- XcmsCCC ccc,
- XcmsFloat hue,
- XcmsFloat value,
- XcmsColor *pColor_return)
-/*
- * DESCRIPTION
- * Return the maximum chroma for a specific hue and value.
- * The returned format is in XcmsTekHVCFormat.
- *
- *
- * 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 tmp;
- XcmsColor max_vc;
- XcmsRGBi rgb_saved;
- int nCount, nMaxCount;
- XcmsFloat nValue, savedValue, lastValue, lastChroma, prevValue;
- XcmsFloat maxDist, nT, rFactor;
- XcmsFloat ftmp1, ftmp2;
-
- /*
- * 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 = value;
- tmp.spec.TekHVC.C = 100.0;
- tmp.pixel = pColor_return->pixel;
- tmp.format = XcmsTekHVCFormat;
-
- /* check to make sure we have a valid TekHVC number */
- if (!_XcmsTekHVC_CheckModify(&tmp)) {
- return(XcmsFailure);
- }
-
- /* Step 1: compute the maximum value and chroma for this hue. */
- memcpy((char *)&max_vc, (char *)&tmp, sizeof(XcmsColor));
- if (_XcmsTekHVCQueryMaxVCRGB(&myCCC, hue, &max_vc, &rgb_saved)
- == XcmsFailure) {
- return(XcmsFailure);
- }
-
- /* Step 2: If the value is less than the value for the maximum */
- /* value, chroma point then the chroma is on the line */
- /* from max_vc to 0,0. */
- if (value <= max_vc.spec.TekHVC.V) {
- tmp.spec.TekHVC.C = value
- * max_vc.spec.TekHVC.C / max_vc.spec.TekHVC.V;
- if (_XcmsTekHVC_CheckModify (&tmp)) {
- memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
- return(XcmsSuccess);
- } else {
- return(XcmsFailure);
- }
- } else {
- /* must do a bisection here to compute the maximum chroma */
- /* save the structure input so that any elements that */
- /* are not touched are recopied later in the routine. */
- nValue = savedValue = value;
- lastChroma = -1.0;
- lastValue = -1.0;
- nMaxCount = MAXBISECTCOUNT;
- maxDist = 100.0 - max_vc.spec.TekHVC.V;
- rFactor = 1.0;
-
- for (nCount = 0; nCount < nMaxCount; nCount++) {
- prevValue = lastValue;
- lastValue = tmp.spec.TekHVC.V;
- lastChroma = tmp.spec.TekHVC.C;
- nT = (nValue - max_vc.spec.TekHVC.V) / maxDist * rFactor;
- tmp.spec.RGBi.red = rgb_saved.red * (1.0 - nT) + nT;
- tmp.spec.RGBi.green = rgb_saved.green * (1.0 - nT) + nT;
- tmp.spec.RGBi.blue = rgb_saved.blue * (1.0 - nT) + nT;
- tmp.format = XcmsRGBiFormat;
-
- /* convert from RGB to HVC */
- if (_XcmsConvertColorsWithWhitePt(&myCCC, &tmp,
- &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat,
- (Bool *) NULL) == XcmsFailure) {
- return(XcmsFailure);
- }
-
- /* Now check the return against what is expected */
- if (tmp.spec.TekHVC.V <= savedValue + EPS &&
- tmp.spec.TekHVC.V >= savedValue - EPS) {
- /* make sure to return the input hue */
- tmp.spec.TekHVC.H = hue;
- if (_XcmsTekHVC_CheckModify (&tmp)) {
- memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
- return(XcmsSuccess);
- } else {
- return(XcmsFailure);
- }
- }
- nValue += savedValue - tmp.spec.TekHVC.V;
- if (nValue < max_vc.spec.TekHVC.V) {
- nValue = max_vc.spec.TekHVC.V;
- rFactor *= 0.5; /* selective relaxation employed */
- } else if (nValue > 100.0) {
- /* make sure to return the input hue */
- tmp.spec.TekHVC.H = hue;
- /* avoid using fabs */
- ftmp1 = lastValue - savedValue;
- if (ftmp1 < 0.0)
- ftmp1 = -ftmp1;
- ftmp2 = tmp.spec.TekHVC.V - savedValue;
- if (ftmp2 < 0.0)
- ftmp2 = -ftmp2;
- if (ftmp1 < ftmp2) {
- tmp.spec.TekHVC.V = lastValue;
- tmp.spec.TekHVC.C = lastChroma;
- }
- if (_XcmsTekHVC_CheckModify (&tmp)) {
- memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
- return(XcmsSuccess);
- } else {
- return(XcmsFailure);
- }
- } else if (tmp.spec.TekHVC.V <= prevValue + EPS &&
- tmp.spec.TekHVC.V >= prevValue - EPS) {
- rFactor *= 0.5; /* selective relaxation employed */
- }
- }
- if (nCount >= nMaxCount) {
- /* avoid using fabs */
- ftmp1 = lastValue - savedValue;
- if (ftmp1 < 0.0)
- ftmp1 = -ftmp1;
- ftmp2 = tmp.spec.TekHVC.V - savedValue;
- if (ftmp2 < 0.0)
- ftmp2 = -ftmp2;
- if (ftmp1 < ftmp2) {
- tmp.spec.TekHVC.V = lastValue;
- tmp.spec.TekHVC.C = lastChroma;
- }
- }
- }
- /* make sure to return the input hue */
- tmp.spec.TekHVC.H = hue;
- memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
- return(XcmsSuccess);
-}
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