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+/* $Xorg: HVCGcV.c,v 1.3 2000/08/17 19:44:36 cpqbld Exp $ */
+
+/*
+ * 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
+ * TekHVCGcV.c
+ *
+ * DESCRIPTION
+ * Source for XcmsTekHVCClipV() gamut compression routine.
+ *
+ */
+/* $XFree86: xc/lib/X11/HVCGcV.c,v 1.3 2001/01/17 19:41:37 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include "Cv.h"
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * XcmsTekHVCClipV - Return the closest value
+ *
+ * SYNOPSIS
+ */
+/* ARGSUSED */
+Status
+XcmsTekHVCClipV (ccc, pColors_in_out, nColors, i, pCompressed)
+ XcmsCCC ccc;
+ XcmsColor *pColors_in_out;
+ unsigned int nColors;
+ unsigned int i;
+ Bool *pCompressed;
+/*
+ * DESCRIPTION
+ * Return the closest value for a specific hue and chroma.
+ * This routine takes any color as input and outputs
+ * a CIE XYZ color.
+ *
+ * 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
+ *
+ */
+{
+ XcmsColor *pColor;
+ XcmsColor hvc_max;
+ XcmsCCCRec myCCC;
+ Status retval;
+
+ /*
+ * 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 WP */
+ myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut compression */
+
+ /*
+ * 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 !
+ */
+ return(XcmsFailure);
+ } else {
+ /* Convert from CIEXYZ to TekHVC format */
+ if (_XcmsDIConvertColors(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+
+ /* check to make sure we have a valid TekHVC number */
+ 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,
+ (XcmsRGBi *)NULL) == XcmsFailure) {
+ return (XcmsFailure);
+ }
+
+ /* Now check and return the appropriate value */
+ if (pColor->spec.TekHVC.C == hvc_max.spec.TekHVC.C) {
+ /* When the chroma input is equal to the maximum chroma */
+ /* merely return the value for that chroma. */
+ pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V;
+ if (!_XcmsTekHVC_CheckModify (pColor)) {
+ return (XcmsFailure);
+ }
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
+ } else if (pColor->spec.TekHVC.C > hvc_max.spec.TekHVC.C) {
+ /* When the chroma input is greater than the maximum chroma */
+ /* merely return the value and chroma for the given hue. */
+ pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
+ pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V;
+ return (XcmsFailure);
+ } else if (pColor->spec.TekHVC.V < hvc_max.spec.TekHVC.V) {
+ /* When the value input is less than the maximum value point */
+ /* compute the intersection of the line from 0,0 to max_V, max_C */
+ /* using the chroma input. */
+ pColor->spec.TekHVC.V = pColor->spec.TekHVC.C *
+ hvc_max.spec.TekHVC.V / hvc_max.spec.TekHVC.C;
+ if (pColor->spec.TekHVC.V >= hvc_max.spec.TekHVC.V) {
+ pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
+ pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V;
+ }
+ if (!_XcmsTekHVC_CheckModify (pColor)) {
+ return (XcmsFailure);
+ }
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
+ } else {
+ /* When the value input is greater than the maximum value point */
+ /* use HvcMaxValue to find the maximum value for the given chroma. */
+ if (pColor->format != XcmsTekHVCFormat) {
+ if (_XcmsDIConvertColors(ccc, pColor,
+ &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+ }
+ if (XcmsTekHVCQueryMaxV(&myCCC,
+ pColor->spec.TekHVC.H,
+ pColor->spec.TekHVC.C,
+ pColor)
+ == XcmsFailure) {
+ 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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