Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 249 insertions, 0 deletions

diff --git a/nx-X11/lib/X11/HVCMxV.c b/nx-X11/lib/X11/HVCMxV.c
new file mode 100644
index 000000000..34acdade0
--- /dev/null
+++ b/nx-X11/lib/X11/HVCMxV.c
@@ -0,0 +1,249 @@
+/* $Xorg: HVCMxV.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
+ *		TekHVCMxV.c
+ *
+ *	DESCRIPTION
+ *		Source for the XcmsTekHVCQueryMaxV() gamut boundary
+ *		querying routine.
+ *
+ */
+/* $XFree86: xc/lib/X11/HVCMxV.c,v 1.4 2003/04/13 19:22:16 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include <math.h>
+#include "Cv.h"
+
+/*
+ *	DEFINES
+ */
+#define MAXBISECTCOUNT	100
+#define EPS	    0.001
+
+
+/************************************************************************
+ *									*
+ *			 PUBLIC ROUTINES				*
+ *									*
+ ************************************************************************/
+
+/*
+ *	NAME
+ *		XcmsTekHVCQueryMaxV - Compute maximum value for a hue and chroma
+ *
+ *	SYNOPSIS
+ */
+Status
+XcmsTekHVCQueryMaxV(ccc, hue, chroma, pColor_return)
+    XcmsCCC ccc;
+    XcmsFloat hue;
+    XcmsFloat chroma;
+    XcmsColor *pColor_return;
+/*
+ *	DESCRIPTION
+ *		Return the maximum value for a specified hue and chroma.
+ *
+ *	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 with no modifications
+ *
+ */
+{
+    XcmsCCCRec myCCC;
+    XcmsColor   tmp;
+    XcmsColor   max_vc;
+    XcmsRGBi    rgb_saved;
+    int         nCount, nMaxCount;
+    XcmsFloat   nT, nChroma, savedChroma, lastValue, lastChroma, prevChroma;
+    XcmsFloat   rFactor;
+    XcmsFloat	ftmp1, ftmp2;
+
+    /*
+     * Check Arguments
+     */
+    if (ccc == NULL || pColor_return == NULL) {
+	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;
+
+    tmp.spec.TekHVC.H = hue;
+    tmp.spec.TekHVC.V = 0.0;
+    tmp.spec.TekHVC.C = chroma;
+    tmp.pixel = pColor_return->pixel;
+    tmp.format = XcmsTekHVCFormat;
+
+    if (!_XcmsTekHVC_CheckModify (&tmp)) {
+	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 *)&max_vc, (char *)&tmp, sizeof(XcmsColor));
+    hue = max_vc.spec.TekHVC.H;
+    if (_XcmsTekHVCQueryMaxVCRGB(&myCCC, max_vc.spec.TekHVC.H, &max_vc, &rgb_saved)
+	    == XcmsFailure) {
+	return(XcmsFailure);
+    }
+
+    if (max_vc.spec.TekHVC.C < tmp.spec.TekHVC.C) {
+	/*
+	 *  If the chroma is greater than the chroma for the 
+	 *  maximum value/chroma point then the value is the
+	 *  the value for the maximum value, chroma point.
+	 *  This is an error but it I return the best approximation I can.
+         *  Thus the inconsistency.
+	 */
+	tmp.spec.TekHVC.C = max_vc.spec.TekHVC.C;
+	tmp.spec.TekHVC.V = max_vc.spec.TekHVC.V;
+	memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
+	return(XcmsSuccess);
+    } else if (max_vc.spec.TekHVC.C == tmp.spec.TekHVC.C) {
+	/*
+	 *  If the chroma is equal to the chroma for the 
+	 *  maximum value/chroma point then the value is the
+	 *  the value for the maximum value, chroma point.
+	 */
+	tmp.spec.TekHVC.V = max_vc.spec.TekHVC.V;
+	memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
+	return(XcmsSuccess);
+    } else {
+	/* must do a bisection here to compute the maximum value */
+	/* save the structure input so that any elements that */
+	/* are not touched are recopied later in the routine. */
+	nChroma = savedChroma = tmp.spec.TekHVC.C;
+	tmp.spec.TekHVC.C = max_vc.spec.TekHVC.C;
+	tmp.spec.TekHVC.V = max_vc.spec.TekHVC.V;
+	lastChroma = -1.0;
+	lastValue = -1.0;
+	nMaxCount = MAXBISECTCOUNT;
+	rFactor = 1.0;
+
+	for (nCount = 0; nCount < nMaxCount; nCount++) {
+	    prevChroma = lastChroma;
+	    lastValue =  tmp.spec.TekHVC.V;
+	    lastChroma = tmp.spec.TekHVC.C;
+	    nT = (1.0 - (nChroma / max_vc.spec.TekHVC.C)) * rFactor;
+	    tmp.spec.RGBi.red   = rgb_saved.red * (1.0 - nT) + nT;
+	    tmp.spec.RGBi.green = rgb_saved.green * (1.0 - nT) + nT;
+	    tmp.spec.RGBi.blue  = rgb_saved.blue * (1.0 - nT) + nT;
+	    tmp.format = XcmsRGBiFormat;
+
+	    /* convert from RGB to HVC */
+	    if (_XcmsConvertColorsWithWhitePt(&myCCC, &tmp,
+		    &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat,
+		    (Bool *) NULL) == XcmsFailure) {
+		return(XcmsFailure);
+	    }
+
+	    /* Now check the return against what is expected */
+	    if (tmp.spec.TekHVC.C <= savedChroma + EPS &&
+		tmp.spec.TekHVC.C >= savedChroma - EPS) {
+		tmp.spec.TekHVC.H = hue;  /* use the saved hue */
+		memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
+		return(XcmsSuccess);
+	    } 
+	    nChroma += savedChroma - tmp.spec.TekHVC.C;
+	    if (nChroma > max_vc.spec.TekHVC.C) {
+		nChroma = max_vc.spec.TekHVC.C;
+		rFactor *= 0.5;  /* selective relaxation employed */
+	    } else if (nChroma < 0.0) {
+		/* avoid using fabs */
+		ftmp1 = lastChroma - savedChroma;
+		if (ftmp1 < 0.0)
+		    ftmp1 = -ftmp1;
+		ftmp2 = tmp.spec.TekHVC.C - savedChroma;
+		if (ftmp2 < 0.0)
+		    ftmp2 = -ftmp2;
+		if (ftmp1 < ftmp2) {
+		    tmp.spec.TekHVC.V = lastValue;
+		    tmp.spec.TekHVC.C = lastChroma;
+		}
+		/* make sure to return the input hue */
+		tmp.spec.TekHVC.H = hue;
+		if (!_XcmsTekHVC_CheckModify(&tmp)) {
+		    return(XcmsFailure);
+		}
+		memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
+		return(XcmsSuccess);
+	    } else if (tmp.spec.TekHVC.C <= prevChroma + EPS &&
+		       tmp.spec.TekHVC.C >= prevChroma - EPS) {
+		rFactor *= 0.5;  /* selective relaxation employed */
+	    }
+	}
+	if (nCount >= nMaxCount) {
+	    /* avoid using fabs */
+	    ftmp1 = lastChroma - savedChroma;
+	    if (ftmp1 < 0.0)
+		ftmp1 = -ftmp1;
+	    ftmp2 = tmp.spec.TekHVC.C - savedChroma;
+	    if (ftmp2 < 0.0)
+		ftmp2 = -ftmp2;
+	    if (ftmp1 < ftmp2) {
+		    tmp.spec.TekHVC.V = lastValue;
+		    tmp.spec.TekHVC.C = lastChroma;
+	    }
+	}
+    }
+
+    /* make sure to return the input hue */
+    tmp.spec.TekHVC.H = hue;
+    memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
+    return(XcmsSuccess);
+}