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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
- * CIELabMxC.c
- *
- * DESCRIPTION
- * Source for the XcmsCIELabQueryMaxC() gamut boundary
- * querying routine.
- *
- */
-
-#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 (XcmsFloat)0.001
-#define START_CHROMA (XcmsFloat)3.6
-#define TOPL (XcmsFloat)100.0
-
-
-/************************************************************************
- * *
- * PUBLIC ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * XcmsCIELabQueryMaxC - max chroma for a hue_angle and L_star
- *
- * SYNOPSIS
- */
-Status
-XcmsCIELabQueryMaxC(
- XcmsCCC ccc,
- XcmsFloat hue_angle, /* hue angle in degrees */
- XcmsFloat L_star,
- XcmsColor *pColor_return)
-/*
- * DESCRIPTION
- * Return the maximum chroma for a specific hue_angle and L_star.
- * The returned format is in XcmsCIELabFormat.
- *
- *
- * 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;
- XcmsColor tmp;
- XcmsColor max_lc;
- XcmsFloat n_L_star, last_L_star, prev_L_star;
- XcmsFloat hue, lastaStar, lastbStar, /*lastChroma,*/ maxDist, nT, rFactor;
- XcmsRGBi rgb_saved;
- int nCount, nMaxCount;
-
- /*
- * Check Arguments
- */
- if (ccc == NULL || pColor_return == NULL) {
- return(XcmsFailure);
- }
-
- /* Use my own CCC and inherit screen white Pt */
- memcpy ((char *)&myCCC, (char *)ccc, sizeof(XcmsCCCRec));
- myCCC.clientWhitePt.format = XcmsUndefinedFormat;
- myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut comp func */
-
- while (hue_angle < 0.0) {
- hue_angle += 360.0;
- }
- while (hue_angle >= 360.0) {
- hue_angle -= 360.0;
- }
-
- hue = radians(hue_angle);
- tmp.spec.CIELab.L_star = L_star;
- tmp.spec.CIELab.a_star = XCMS_CIEASTAROFHUE(hue, START_CHROMA);
- tmp.spec.CIELab.b_star = XCMS_CIEBSTAROFHUE(hue, START_CHROMA);
- tmp.pixel = pColor_return->pixel;
- tmp.format = XcmsCIELabFormat;
-
- /* Step 1: compute the maximum L_star and chroma for this hue. */
- memcpy((char *)&max_lc, (char *)&tmp, sizeof(XcmsColor));
- if (_XcmsCIELabQueryMaxLCRGB(&myCCC, hue, &max_lc, &rgb_saved)
- == XcmsFailure) {
- return(XcmsFailure);
- }
-
- /*
- * Step 2: Do a bisection here to compute the maximum chroma
- * Note the differences between when the point to be found
- * is above the maximum LC point and when it is below.
- */
- if (L_star <= max_lc.spec.CIELab.L_star) {
- maxDist = max_lc.spec.CIELab.L_star;
- } else {
- maxDist = TOPL - max_lc.spec.CIELab.L_star;
- }
-
- n_L_star = L_star;
- last_L_star = -1.0;
- nMaxCount = MAXBISECTCOUNT;
- rFactor = 1.0;
-
- for (nCount = 0; nCount < nMaxCount; nCount++) {
- prev_L_star = last_L_star;
- last_L_star = tmp.spec.CIELab.L_star;
-/* lastChroma = XCMS_CIELAB_PMETRIC_CHROMA(tmp.spec.CIELab.a_star, */
-/* tmp.spec.CIELab.b_star); */
- lastaStar = tmp.spec.CIELab.a_star;
- lastbStar = tmp.spec.CIELab.b_star;
- nT = (n_L_star - max_lc.spec.CIELab.L_star) / maxDist * rFactor;
- if (nT > 0) {
- 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;
- } else {
- tmp.spec.RGBi.red = rgb_saved.red + (rgb_saved.red * nT);
- tmp.spec.RGBi.green = rgb_saved.green + (rgb_saved.green * nT);
- tmp.spec.RGBi.blue = rgb_saved.blue + (rgb_saved.blue * nT);
- }
- tmp.format = XcmsRGBiFormat;
-
- /* convert from RGB to CIELab */
- if (_XcmsConvertColorsWithWhitePt(&myCCC, &tmp,
- ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat,
- (Bool *) NULL) == XcmsFailure) {
- return(XcmsFailure);
- }
-
- /*
- * Now check if we've reached the target L_star
- */
- /* printf("result Lstar = %lf\n", tmp.spec.CIELab.L_star); */
- if (tmp.spec.CIELab.L_star <= L_star + EPS &&
- tmp.spec.CIELab.L_star >= L_star - EPS) {
- memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
- return(XcmsSuccess);
- }
- if (nT > 0) {
- n_L_star += ((TOPL - n_L_star) *
- (L_star - tmp.spec.CIELab.L_star)) / (TOPL - L_star);
- } else {
- n_L_star *= L_star / tmp.spec.CIELuv.L_star;
- }
- if (tmp.spec.CIELab.L_star <= prev_L_star + EPS &&
- tmp.spec.CIELab.L_star >= prev_L_star - EPS) {
- rFactor *= 0.5; /* selective relaxation employed */
- /* printf("rFactor = %lf\n", rFactor); */
- }
- }
- if (XCMS_FABS(last_L_star - L_star) <
- XCMS_FABS(tmp.spec.CIELab.L_star - L_star)) {
- tmp.spec.CIELab.a_star = lastaStar;
- tmp.spec.CIELab.b_star = lastbStar;
-/* tmp.spec.CIELab.a_star = XCMS_CIEASTAROFHUE(hue, lastChroma); */
-/* tmp.spec.CIELab.b_star = XCMS_CIEBSTAROFHUE(hue, lastChroma); */
- }
- tmp.spec.CIELab.L_star = L_star;
- memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
- return(XcmsSuccess);
-}
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