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+/* $Xorg: HVCMxVs.c,v 1.3 2000/08/17 19:44:37 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
+ * TekHVCMxVs.c
+ *
+ * DESCRIPTION
+ * Source for the XcmsTekHVCQueryMaxVSamples() gamut boundary
+ * querying routine.
+ */
+/* $XFree86: xc/lib/X11/HVCMxVs.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
+ * XcmsTekHVCQueryMaxVSamples - Compute a set of value/chroma
+ * pairs.
+ *
+ * SYNOPSIS
+ */
+Status
+XcmsTekHVCQueryMaxVSamples(ccc, hue, pColor_in_out, nSamples)
+ 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);
+}