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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. 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 this copyright, permission, and disclaimer notice is reproduced in
+ * all copies of this software and in supporting documentation. TekColor
+ * is a trademark of Tektronix, Inc.
+ *
+ * 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
+ * CIELabGcL.c
+ *
+ * DESCRIPTION
+ * Source for XcmsCIELabClipL() gamut compression routine.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include "Cv.h"
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * XcmsCIELabClipL - Return the closest L*
+ *
+ * SYNOPSIS
+ */
+/* ARGSUSED */
+Status
+XcmsCIELabClipL (
+ XcmsCCC ccc,
+ XcmsColor *pColors_in_out,
+ unsigned int nColors,
+ unsigned int i,
+ Bool *pCompressed)
+/*
+ * DESCRIPTION
+ * Return the closest L* 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 L* within
+ * pColor_in_out intermediate results may be returned
+ * even though it may be invalid.
+ *
+ * RETURNS
+ * XcmsFailure - Failure
+ * XcmsSuccess - Succeeded
+ *
+ */
+{
+ XcmsCCCRec myCCC;
+ XcmsColor *pColor;
+ XcmsColor Lab_max;
+ XcmsFloat hue, chroma, maxChroma;
+ Status retval;
+
+ /* 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) {
+ /*
+ * GRAY !
+ */
+ return(XcmsFailure);
+ } else {
+ /* Convert from CIEXYZ to CIE L*u*v* format */
+ if (_XcmsDIConvertColors(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+
+ hue = XCMS_CIELAB_PMETRIC_HUE(pColor->spec.CIELab.a_star,
+ pColor->spec.CIELab.b_star);
+ chroma = XCMS_CIELAB_PMETRIC_CHROMA(pColor->spec.CIELab.a_star,
+ pColor->spec.CIELab.b_star);
+ /* Step 1: compute the maximum L* and chroma for this hue. */
+ /* This copy may be overkill but it preserves the pixel etc. */
+ memcpy((char *)&Lab_max, (char *)pColor, sizeof(XcmsColor));
+ if (_XcmsCIELabQueryMaxLCRGB (&myCCC, hue, &Lab_max,
+ (XcmsRGBi *)NULL) == XcmsFailure) {
+ return (XcmsFailure);
+ }
+ maxChroma = XCMS_CIELAB_PMETRIC_CHROMA(Lab_max.spec.CIELab.a_star,
+ Lab_max.spec.CIELab.b_star);
+
+ /* Now check and return the appropriate L* */
+ if (chroma == maxChroma) {
+ /* When the chroma input is equal to the maximum chroma */
+ /* merely return the L* for that chroma. */
+ memcpy((char *)pColor, (char *)&Lab_max, sizeof(XcmsColor));
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat);
+ } else if (chroma > maxChroma) {
+ /* When the chroma input is greater than the maximum chroma */
+ /* merely return the L* and chroma for the given hue. */
+ memcpy((char *)pColor, (char *)&Lab_max, sizeof(XcmsColor));
+ return (XcmsFailure);
+ } else if (pColor->spec.CIELab.L_star < Lab_max.spec.CIELab.L_star) {
+ /* Find the minimum lightness for the given chroma. */
+ if (pColor->format != XcmsCIELabFormat) {
+ if (_XcmsDIConvertColors(ccc, pColor,
+ ScreenWhitePointOfCCC(ccc), 1, XcmsCIELabFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+ }
+ if (XcmsCIELabQueryMinL(&myCCC, degrees(hue), chroma, pColor)
+ == XcmsFailure) {
+ return (XcmsFailure);
+ }
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat);
+ } else {
+ /* Find the maximum lightness for the given chroma. */
+ if (pColor->format != XcmsCIELabFormat) {
+ if (_XcmsDIConvertColors(ccc, pColor,
+ ScreenWhitePointOfCCC(ccc), 1, XcmsCIELabFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+ }
+ if (XcmsCIELabQueryMaxL(&myCCC, degrees(hue), chroma, pColor)
+ == XcmsFailure) {
+ return (XcmsFailure);
+ }
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat);
+ }
+ if (retval != XcmsFailure && pCompressed != NULL) {
+ *(pCompressed + i) = True;
+ }
+ return(retval);
+ }
+}