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+/* $Xorg: HVCMxVC.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
+ * TekHVCMxVC.c
+ *
+ * DESCRIPTION
+ * Source for the XcmsTekHVCQueryMaxVC() gamut boundary
+ * querying routine.
+ *
+ */
+/* $XFree86$ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include "Cv.h"
+
+/*
+ * DEFINES
+ */
+#define MIN(x,y) ((x) > (y) ? (y) : (x))
+#define MIN3(x,y,z) ((x) > (MIN((y), (z))) ? (MIN((y), (z))) : (x))
+#define MAX(x,y) ((x) > (y) ? (x) : (y))
+#define MAX3(x,y,z) ((x) > (MAX((y), (z))) ? (x) : (MAX((y), (z))))
+#define START_V 40.0
+#define START_C 120.0
+
+
+/************************************************************************
+ * *
+ * API PRIVATE ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * _XcmsTekHVCQueryMaxVCRGB - Compute maximum value/chroma.
+ *
+ * SYNOPSIS
+ */
+Status
+_XcmsTekHVCQueryMaxVCRGB(
+ XcmsCCC ccc,
+ XcmsFloat hue,
+ XcmsColor *pColor_return,
+ XcmsRGBi *pRGB_return)
+
+/*
+ * DESCRIPTION
+ * Return the maximum chroma for a specified hue, and the
+ * corresponding value. This is computed by a binary search of
+ * all possible chromas. An assumption is made that there are
+ * no local maxima. Use the unrounded Max Chroma because
+ * the difference check can be small.
+ *
+ * NOTE: No local CCC is used because this is a private
+ * routine and all routines that call it are expected
+ * to behave properly, i.e. send a local CCC with
+ * no white adjust function and no gamut compression
+ * function.
+ *
+ * This routine only accepts hue as input and outputs
+ * HVC's and RGBi's.
+ *
+ * RETURNS
+ * XcmsFailure - Failure
+ * XCMS_SUCCUSS - Succeeded
+ *
+ */
+{
+ XcmsFloat nSmall, nLarge;
+ XcmsColor tmp;
+
+ tmp.format = XcmsTekHVCFormat;
+ tmp.spec.TekHVC.H = hue;
+ /* Use some unreachable color on the given hue */
+ tmp.spec.TekHVC.V = START_V;
+ tmp.spec.TekHVC.C = START_C;
+
+
+ /*
+ * Convert from HVC to RGB
+ *
+ * Note that the CIEXYZ to RGBi conversion routine must stuff the
+ * out of bounds RGBi values in tmp when the ccc->gamutCompProc
+ * is NULL.
+ */
+ if ((_XcmsConvertColorsWithWhitePt(ccc, &tmp,
+ &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsRGBiFormat, (Bool *) NULL)
+ == XcmsFailure) && tmp.format != XcmsRGBiFormat) {
+ return (XcmsFailure);
+ }
+
+ /* Now pick the smallest RGB */
+ nSmall = MIN3(tmp.spec.RGBi.red,
+ tmp.spec.RGBi.green,
+ tmp.spec.RGBi.blue);
+ /* Make the smallest RGB equal to zero */
+ tmp.spec.RGBi.red -= nSmall;
+ tmp.spec.RGBi.green -= nSmall;
+ tmp.spec.RGBi.blue -= nSmall;
+
+ /* Now pick the largest RGB */
+ nLarge = MAX3(tmp.spec.RGBi.red,
+ tmp.spec.RGBi.green,
+ tmp.spec.RGBi.blue);
+ /* Scale the RGB values based on the largest one */
+ tmp.spec.RGBi.red /= nLarge;
+ tmp.spec.RGBi.green /= nLarge;
+ tmp.spec.RGBi.blue /= nLarge;
+ tmp.format = XcmsRGBiFormat;
+
+ /* If the calling routine wants RGB value give them the ones used. */
+ if (pRGB_return) {
+ pRGB_return->red = tmp.spec.RGBi.red;
+ pRGB_return->green = tmp.spec.RGBi.green;
+ pRGB_return->blue = tmp.spec.RGBi.blue;
+ }
+
+ /* Convert from RGBi to HVC */
+ if (_XcmsConvertColorsWithWhitePt(ccc, &tmp,
+ &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat, (Bool *) NULL)
+ == XcmsFailure) {
+ return (XcmsFailure);
+ }
+
+ /* make sure to return the input hue */
+ tmp.spec.TekHVC.H = hue;
+ memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
+ return (XcmsSuccess);
+}
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * XcmsTekHVCQueryMaxVC - Compute maximum value and chroma.
+ *
+ * SYNOPSIS
+ */
+Status
+XcmsTekHVCQueryMaxVC (
+ XcmsCCC ccc,
+ XcmsFloat hue,
+ XcmsColor *pColor_return)
+
+/*
+ * DESCRIPTION
+ * Return the maximum chroma for the specified hue, and the
+ * corresponding value.
+ *
+ * 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;
+
+ /*
+ * 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;
+ myCCC.gamutCompProc = (XcmsCompressionProc)NULL;
+
+ while (hue < 0.0) {
+ hue += 360.0;
+ }
+ while (hue >= 360.0) {
+ hue -= 360.0;
+ }
+
+ return(_XcmsTekHVCQueryMaxVCRGB (&myCCC, hue, pColor_return,
+ (XcmsRGBi *)NULL));
+}
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