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+/* $Xorg: LabGcC.c,v 1.3 2000/08/17 19:44:39 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. 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
+ * CIELabGcC.c
+ *
+ * DESCRIPTION
+ * Source for XcmsCIELabClipuv() gamut compression routine.
+ *
+ */
+/* $XFree86: xc/lib/X11/LabGcC.c,v 1.3 2001/01/17 19:41:38 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include "Cv.h"
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * XcmsCIELabClipab - Reduce the chroma for a hue and L*
+ *
+ * SYNOPSIS
+ */
+/* ARGSUSED */
+Status
+XcmsCIELabClipab (ccc, pColors_in_out, nColors, i, pCompressed)
+ XcmsCCC ccc;
+ XcmsColor *pColors_in_out;
+ unsigned int nColors;
+ unsigned int i;
+ Bool *pCompressed;
+/*
+ * DESCRIPTION
+ * Reduce the Chroma for a specific hue and chroma to
+ * to bring the given color into the gamut of the
+ * specified device. As required of gamut compression
+ * functions, this routine returns pColor_in_out
+ * in XcmsCIEXYZFormat on successful completion.
+ *
+ * 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
+ *
+ */
+{
+ Status retval;
+ XcmsColor *pColor;
+
+ /*
+ * 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 < PseudoColor) {
+ /*
+ * GRAY !
+ */
+ _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
+ 1, XcmsCIELabFormat);
+ _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
+ 1, XcmsCIEXYZFormat);
+ if (pCompressed) {
+ *(pCompressed + i) = True;
+ }
+ return(XcmsSuccess);
+ } else {
+ if (pColor->format != XcmsCIELabFormat) {
+ if (_XcmsDIConvertColors(ccc, pColor,
+ &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIELabFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+ }
+ if (XcmsCIELabQueryMaxC(ccc,
+ degrees(XCMS_CIELAB_PMETRIC_HUE(pColor->spec.CIELab.a_star,
+ pColor->spec.CIELab.b_star)),
+ pColor->spec.CIELab.L_star,
+ pColor) == XcmsFailure) {
+ return(XcmsFailure);
+ }
+ retval = _XcmsDIConvertColors(ccc, pColor,
+ &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
+ if (retval != XcmsFailure && pCompressed != NULL) {
+ *(pCompressed + i) = True;
+ }
+ return(retval);
+ }
+}