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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
+ * TekHVCGcVC.c
+ *
+ * DESCRIPTION
+ * Source for XcmsTekHVCClipVC() gamut
+ * compression function.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include <math.h>
+#include "Cv.h"
+
+/*
+ * INTERNALS
+ * Internal defines that need NOT be exported to any package or
+ * program using this package.
+ */
+#define MAXBISECTCOUNT 100
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * XcmsTekHVCClipVC - Return the closest value and chroma
+ *
+ * SYNOPSIS
+ */
+/* ARGSUSED */
+Status
+XcmsTekHVCClipVC (
+ XcmsCCC ccc,
+ XcmsColor *pColors_in_out,
+ unsigned int nColors,
+ unsigned int i,
+ Bool *pCompressed)
+/*
+ * DESCRIPTION
+ * This routine will find the closest value and chroma
+ * for a specific hue. The color input is converted to
+ * HVC format and returned as CIE XYZ format.
+ *
+ * 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;
+ XcmsCCCRec myCCC;
+ XcmsColor *pColor;
+ XcmsColor hvc_max;
+ XcmsRGBi rgb_max;
+ int nCount, nMaxCount, nI, nILast;
+ XcmsFloat Chroma, Value, bestChroma, bestValue, nT, saveDist, tmpDist;
+
+ /*
+ * 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 compression func */
+
+ /*
+ * 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 < 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 {
+ /* Convert from CIEXYZ to TekHVC format */
+ if (_XcmsDIConvertColors(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+
+ if (!_XcmsTekHVC_CheckModify(pColor)) {
+ 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 *)&hvc_max, (char *)pColor, sizeof(XcmsColor));
+ if (_XcmsTekHVCQueryMaxVCRGB (&myCCC, hvc_max.spec.TekHVC.H, &hvc_max,
+ &rgb_max) == XcmsFailure) {
+ return (XcmsFailure);
+ }
+
+ /* Now check and return the appropriate value */
+ if (pColor->spec.TekHVC.V == hvc_max.spec.TekHVC.V) {
+ /* When the value input is equal to the maximum value */
+ /* merely return the chroma for that value. */
+ pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
+ }
+
+ if (pColor->spec.TekHVC.V < hvc_max.spec.TekHVC.V) {
+ /* return the intersection of the perpindicular line through */
+ /* the value and chroma given and the line from 0,0 and hvc_max. */
+ Chroma = pColor->spec.TekHVC.C;
+ Value = pColor->spec.TekHVC.V;
+ pColor->spec.TekHVC.C =
+ (Value + (hvc_max.spec.TekHVC.C / hvc_max.spec.TekHVC.V * Chroma)) /
+ ((hvc_max.spec.TekHVC.V / hvc_max.spec.TekHVC.C) +
+ (hvc_max.spec.TekHVC.C / hvc_max.spec.TekHVC.V));
+ if (pColor->spec.TekHVC.C >= hvc_max.spec.TekHVC.C) {
+ pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
+ pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V;
+ } else {
+ pColor->spec.TekHVC.V = pColor->spec.TekHVC.C *
+ hvc_max.spec.TekHVC.V / hvc_max.spec.TekHVC.C;
+ }
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
+
+ if (retval != XcmsFailure && pCompressed != NULL) {
+ *(pCompressed + i) = True;
+ }
+ return (retval);
+ }
+
+ /* return the closest point on the upper part of the hue leaf. */
+ /* must do a bisection here to compute the delta e. */
+ nMaxCount = MAXBISECTCOUNT;
+ nI = nMaxCount / 2;
+ bestValue = Value = pColor->spec.TekHVC.V;
+ bestChroma = Chroma = pColor->spec.TekHVC.C;
+ saveDist = (XcmsFloat) XCMS_SQRT ((double) (((Chroma - hvc_max.spec.TekHVC.C) *
+ (Chroma - hvc_max.spec.TekHVC.C)) +
+ ((Value - hvc_max.spec.TekHVC.V) *
+ (Value - hvc_max.spec.TekHVC.V))));
+ for (nCount = 0; nCount < nMaxCount; nCount++) {
+ nT = (XcmsFloat) nI / (XcmsFloat) nMaxCount;
+ pColor->spec.RGBi.red = rgb_max.red * (1.0 - nT) + nT;
+ pColor->spec.RGBi.green = rgb_max.green * (1.0 - nT) + nT;
+ pColor->spec.RGBi.blue = rgb_max.blue * (1.0 - nT) + nT;
+ pColor->format = XcmsRGBiFormat;
+
+ /* Convert from RGBi to HVC */
+ if (_XcmsConvertColorsWithWhitePt(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat,
+ (Bool *) NULL)
+ == XcmsFailure) {
+ return (XcmsFailure);
+ }
+ if (!_XcmsTekHVC_CheckModify(pColor)) {
+ return (XcmsFailure);
+ }
+ tmpDist = (XcmsFloat) XCMS_SQRT ((double)
+ (((Chroma - pColor->spec.TekHVC.C) *
+ (Chroma - pColor->spec.TekHVC.C)) +
+ ((Value - pColor->spec.TekHVC.V) *
+ (Value - pColor->spec.TekHVC.V))));
+ nILast = nI;
+ if (tmpDist > saveDist) {
+ nI /= 2;
+ } else {
+ nI = (nMaxCount + nI) / 2;
+ saveDist = tmpDist;
+ bestValue = pColor->spec.TekHVC.V;
+ bestChroma = pColor->spec.TekHVC.C;
+ }
+ if (nI == nILast || nI == 0) {
+ break;
+ }
+
+ }
+
+ if (bestChroma >= hvc_max.spec.TekHVC.C) {
+ pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
+ pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V;
+ } else {
+ pColor->spec.TekHVC.C = bestChroma;
+ pColor->spec.TekHVC.V = bestValue;
+ }
+ if (!_XcmsTekHVC_CheckModify(pColor)) {
+ return (XcmsFailure);
+ }
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
+
+ if (retval != XcmsFailure && pCompressed != NULL) {
+ *(pCompressed + i) = True;
+ }
+ return(retval);
+ }
+}
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