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262 lines
8.8 KiB
C
262 lines
8.8 KiB
C
/* $Xorg: HVCGcVC.c,v 1.3 2000/08/17 19:44:36 cpqbld Exp $ */
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/*
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* Code and supporting documentation (c) Copyright 1990 1991 Tektronix, Inc.
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* All Rights Reserved
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*
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* This file is a component of an X Window System-specific implementation
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* of Xcms based on the TekColor Color Management System. TekColor is a
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* trademark of Tektronix, Inc. The term "TekHVC" designates a particular
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* color space that is the subject of U.S. Patent No. 4,985,853 (equivalent
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* foreign patents pending). Permission is hereby granted to use, copy,
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* modify, sell, and otherwise distribute this software and its
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* documentation for any purpose and without fee, provided that:
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*
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* 1. This copyright, permission, and disclaimer notice is reproduced in
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* all copies of this software and any modification thereof and in
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* supporting documentation;
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* 2. Any color-handling application which displays TekHVC color
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* cooordinates identifies these as TekHVC color coordinates in any
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* interface that displays these coordinates and in any associated
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* documentation;
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* 3. The term "TekHVC" is always used, and is only used, in association
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* with the mathematical derivations of the TekHVC Color Space,
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* including those provided in this file and any equivalent pathways and
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* mathematical derivations, regardless of digital (e.g., floating point
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* or integer) representation.
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*
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* Tektronix makes no representation about the suitability of this software
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* for any purpose. It is provided "as is" and with all faults.
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*
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* TEKTRONIX DISCLAIMS ALL WARRANTIES APPLICABLE TO THIS SOFTWARE,
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* INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE. IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR THE PERFORMANCE OF THIS SOFTWARE.
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*
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* NAME
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* TekHVCGcVC.c
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*
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* DESCRIPTION
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* Source for XcmsTekHVCClipVC() gamut
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* compression function.
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*/
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/* $XFree86: xc/lib/X11/HVCGcVC.c,v 1.4 2003/04/13 19:22:16 dawes Exp $ */
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#include "Xlibint.h"
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#include "Xcmsint.h"
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#include <math.h>
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#include "Cv.h"
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/*
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* INTERNALS
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* Internal defines that need NOT be exported to any package or
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* program using this package.
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*/
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#define MAXBISECTCOUNT 100
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/************************************************************************
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* *
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* PUBLIC ROUTINES *
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* *
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************************************************************************/
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/*
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* NAME
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* XcmsTekHVCClipVC - Return the closest value and chroma
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*
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* SYNOPSIS
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*/
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/* ARGSUSED */
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Status
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XcmsTekHVCClipVC (ccc, pColors_in_out, nColors, i, pCompressed)
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XcmsCCC ccc;
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XcmsColor *pColors_in_out;
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unsigned int nColors;
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unsigned int i;
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Bool *pCompressed;
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/*
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* DESCRIPTION
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* This routine will find the closest value and chroma
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* for a specific hue. The color input is converted to
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* HVC format and returned as CIE XYZ format.
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*
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* Since this routine works with the value within
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* pColor_in_out intermediate results may be returned
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* even though it may be invalid.
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*
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* RETURNS
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* XcmsFailure - Failure
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* XcmsSuccess - Succeeded
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*
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*/
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{
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Status retval;
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XcmsCCCRec myCCC;
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XcmsColor *pColor;
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XcmsColor hvc_max;
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XcmsRGBi rgb_max;
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int nCount, nMaxCount, nI, nILast;
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XcmsFloat Chroma, Value, bestChroma, bestValue, nT, saveDist, tmpDist;
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/*
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* Insure TekHVC installed
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*/
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if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) {
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return(XcmsFailure);
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}
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/* Use my own CCC */
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memcpy ((char *)&myCCC, (char *)ccc, sizeof(XcmsCCCRec));
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myCCC.clientWhitePt.format = XcmsUndefinedFormat;/* inherit screen white pt */
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myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut compression func */
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/*
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* Color specification passed as input can be assumed to:
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* 1. Be in XcmsCIEXYZFormat
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* 2. Already be white point adjusted for the Screen White Point.
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* This means that the white point now associated with this
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* color spec is the Screen White Point (even if the
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* ccc->clientWhitePt differs).
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*/
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pColor = pColors_in_out + i;
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if (ccc->visual->class < StaticColor &&
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FunctionSetOfCCC(ccc) != (XPointer) &XcmsLinearRGBFunctionSet) {
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/*
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* GRAY !
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*/
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_XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt,
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1, XcmsTekHVCFormat);
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pColor->spec.TekHVC.H = pColor->spec.TekHVC.C = 0.0;
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_XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt,
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1, XcmsCIEXYZFormat);
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if (pCompressed) {
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*(pCompressed + i) = True;
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}
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return(XcmsSuccess);
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} else {
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/* Convert from CIEXYZ to TekHVC format */
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if (_XcmsDIConvertColors(&myCCC, pColor,
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&myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat)
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== XcmsFailure) {
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return(XcmsFailure);
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}
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if (!_XcmsTekHVC_CheckModify(pColor)) {
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return (XcmsFailure);
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}
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/* Step 1: compute the maximum value and chroma for this hue. */
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/* This copy may be overkill but it preserves the pixel etc. */
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memcpy((char *)&hvc_max, (char *)pColor, sizeof(XcmsColor));
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if (_XcmsTekHVCQueryMaxVCRGB (&myCCC, hvc_max.spec.TekHVC.H, &hvc_max,
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&rgb_max) == XcmsFailure) {
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return (XcmsFailure);
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}
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/* Now check and return the appropriate value */
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if (pColor->spec.TekHVC.V == hvc_max.spec.TekHVC.V) {
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/* When the value input is equal to the maximum value */
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/* merely return the chroma for that value. */
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pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
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retval = _XcmsDIConvertColors(&myCCC, pColor,
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&myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
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}
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if (pColor->spec.TekHVC.V < hvc_max.spec.TekHVC.V) {
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/* return the intersection of the perpindicular line through */
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/* the value and chroma given and the line from 0,0 and hvc_max. */
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Chroma = pColor->spec.TekHVC.C;
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Value = pColor->spec.TekHVC.V;
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pColor->spec.TekHVC.C =
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(Value + (hvc_max.spec.TekHVC.C / hvc_max.spec.TekHVC.V * Chroma)) /
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((hvc_max.spec.TekHVC.V / hvc_max.spec.TekHVC.C) +
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(hvc_max.spec.TekHVC.C / hvc_max.spec.TekHVC.V));
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if (pColor->spec.TekHVC.C >= hvc_max.spec.TekHVC.C) {
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pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
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pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V;
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} else {
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pColor->spec.TekHVC.V = pColor->spec.TekHVC.C *
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hvc_max.spec.TekHVC.V / hvc_max.spec.TekHVC.C;
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}
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retval = _XcmsDIConvertColors(&myCCC, pColor,
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&myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
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if (retval != XcmsFailure && pCompressed != NULL) {
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*(pCompressed + i) = True;
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}
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return (retval);
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}
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/* return the closest point on the upper part of the hue leaf. */
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/* must do a bisection here to compute the delta e. */
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nMaxCount = MAXBISECTCOUNT;
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nI = nMaxCount / 2;
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bestValue = Value = pColor->spec.TekHVC.V;
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bestChroma = Chroma = pColor->spec.TekHVC.C;
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saveDist = (XcmsFloat) XCMS_SQRT ((double) (((Chroma - hvc_max.spec.TekHVC.C) *
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(Chroma - hvc_max.spec.TekHVC.C)) +
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((Value - hvc_max.spec.TekHVC.V) *
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(Value - hvc_max.spec.TekHVC.V))));
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for (nCount = 0; nCount < nMaxCount; nCount++) {
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nT = (XcmsFloat) nI / (XcmsFloat) nMaxCount;
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pColor->spec.RGBi.red = rgb_max.red * (1.0 - nT) + nT;
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pColor->spec.RGBi.green = rgb_max.green * (1.0 - nT) + nT;
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pColor->spec.RGBi.blue = rgb_max.blue * (1.0 - nT) + nT;
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pColor->format = XcmsRGBiFormat;
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/* Convert from RGBi to HVC */
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if (_XcmsConvertColorsWithWhitePt(&myCCC, pColor,
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&myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat,
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(Bool *) NULL)
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== XcmsFailure) {
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return (XcmsFailure);
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}
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if (!_XcmsTekHVC_CheckModify(pColor)) {
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return (XcmsFailure);
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}
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tmpDist = (XcmsFloat) XCMS_SQRT ((double)
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(((Chroma - pColor->spec.TekHVC.C) *
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(Chroma - pColor->spec.TekHVC.C)) +
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((Value - pColor->spec.TekHVC.V) *
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(Value - pColor->spec.TekHVC.V))));
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nILast = nI;
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if (tmpDist > saveDist) {
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nI /= 2;
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} else {
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nI = (nMaxCount + nI) / 2;
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saveDist = tmpDist;
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bestValue = pColor->spec.TekHVC.V;
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bestChroma = pColor->spec.TekHVC.C;
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}
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if (nI == nILast || nI == 0) {
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break;
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}
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}
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if (bestChroma >= hvc_max.spec.TekHVC.C) {
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pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C;
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pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V;
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} else {
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pColor->spec.TekHVC.C = bestChroma;
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pColor->spec.TekHVC.V = bestValue;
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}
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if (!_XcmsTekHVC_CheckModify(pColor)) {
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return (XcmsFailure);
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}
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retval = _XcmsDIConvertColors(&myCCC, pColor,
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&myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat);
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if (retval != XcmsFailure && pCompressed != NULL) {
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*(pCompressed + i) = True;
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}
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return(retval);
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}
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}
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