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-rw-r--r--nx-X11/lib/X11/LuvMxL.c216
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diff --git a/nx-X11/lib/X11/LuvMxL.c b/nx-X11/lib/X11/LuvMxL.c
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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
- * CIELuvMxL.c
- *
- * DESCRIPTION
- * Source for the XcmsCIELuvQueryMaxL() 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_L_STAR (XcmsFloat)40.0
-
-
-/************************************************************************
- * *
- * PUBLIC ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * XcmsCIELuvQueryMaxL - Compute max Lstar for a hue and chroma
- *
- * SYNOPSIS
- */
-Status
-XcmsCIELuvQueryMaxL(
- XcmsCCC ccc,
- XcmsFloat hue_angle, /* hue angle in degrees */
- XcmsFloat chroma,
- XcmsColor *pColor_return)
-/*
- * DESCRIPTION
- * Return the maximum Lstar for a specified hue_angle 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 max_lc, tmp, prev;
- XcmsFloat max_chroma, tmp_chroma;
- XcmsFloat hue, nT, nChroma, lastChroma, prevChroma;
- XcmsFloat rFactor;
- XcmsRGBi rgb_saved;
- int nCount, nMaxCount;
-
- /*
- * Check Arguments
- */
- if (ccc == NULL || pColor_return == NULL) {
- 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;
-
- while (hue_angle < 0.0) {
- hue_angle += 360.0;
- }
- while (hue_angle >= 360.0) {
- hue_angle -= 360.0;
- }
-
- hue = radians(hue_angle);
- tmp.spec.CIELuv.L_star = START_L_STAR;
- tmp.spec.CIELuv.u_star = XCMS_CIEUSTAROFHUE(hue, chroma);
- tmp.spec.CIELuv.v_star = XCMS_CIEVSTAROFHUE(hue, chroma);
- tmp.pixel = pColor_return->pixel;
- tmp.format = XcmsCIELuvFormat;
-
- /* Step 1: Obtain the maximum L_star and chroma for this hue. */
- if (_XcmsCIELuvQueryMaxLCRGB(&myCCC, hue, &max_lc, &rgb_saved)
- == XcmsFailure) {
- return(XcmsFailure);
- }
-
- max_chroma = XCMS_CIELUV_PMETRIC_CHROMA(max_lc.spec.CIELuv.u_star,
- max_lc.spec.CIELuv.v_star);
-
- if (max_chroma <= chroma) {
- /*
- * If the chroma is greater than the chroma for the
- * maximum L/chroma point then the L_star is the
- * the L_star for the maximum L_star/chroma point.
- * This is an error but I return the best approximation I can.
- * Thus the inconsistency.
- */
- memcpy ((char *) pColor_return, (char *) &max_lc, sizeof (XcmsColor));
- return(XcmsSuccess);
- }
-
- /*
- * If the chroma is equal to the chroma for the
- * maximum L_star/chroma point then the L_star is the
- * the L_star for the maximum L* and chroma point.
- */
- /* if (max_chroma == chroma) {
- * memcpy ((char *) pColor_return, (char *) &max_lc, sizeof (XcmsColor));
- * return(XcmsSuccess);
- * }
- */
-
- /* must do a bisection here to compute the maximum L* */
- /* save the structure input so that any elements that */
- /* are not touched are recopied later in the routine. */
- nChroma = chroma;
- tmp_chroma = max_chroma;
- lastChroma = -1.0;
- nMaxCount = MAXBISECTCOUNT;
- rFactor = 1.0;
-
- for (nCount = 0; nCount < nMaxCount; nCount++) {
- prevChroma = lastChroma;
- lastChroma = tmp_chroma;
- nT = (1.0 - (nChroma / max_chroma)) * rFactor;
- memcpy ((char *)&prev, (char *)&tmp, sizeof(XcmsColor));
- 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 CIELuv */
- if (_XcmsConvertColorsWithWhitePt(&myCCC, &tmp,
- ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELuvFormat,
- (Bool *) NULL) == XcmsFailure) {
- return(XcmsFailure);
- }
-
- /* Now check the return against what is expected */
- tmp_chroma = XCMS_CIELUV_PMETRIC_CHROMA(tmp.spec.CIELuv.u_star,
- tmp.spec.CIELuv.v_star);
- if (tmp_chroma <= chroma + EPS && tmp_chroma >= chroma - EPS) {
- /* Found It! */
- memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
- return(XcmsSuccess);
- }
- nChroma += chroma - tmp_chroma;
- if (nChroma > max_chroma) {
- nChroma = max_chroma;
- rFactor *= 0.5; /* selective relaxation employed */
- } else if (nChroma < 0.0) {
- if (XCMS_FABS(lastChroma - chroma) <
- XCMS_FABS(tmp_chroma - chroma)) {
- memcpy ((char *)pColor_return, (char *)&prev,
- sizeof(XcmsColor));
- } else {
- memcpy ((char *)pColor_return, (char *)&tmp,
- sizeof(XcmsColor));
- }
- return(XcmsSuccess);
- } else if (tmp_chroma <= prevChroma + EPS &&
- tmp_chroma >= prevChroma - EPS) {
- rFactor *= 0.5; /* selective relaxation employed */
- }
- }
-
- if (nCount >= nMaxCount) {
- if (XCMS_FABS(lastChroma - chroma) <
- XCMS_FABS(tmp_chroma - chroma)) {
- memcpy ((char *)pColor_return, (char *)&prev,
- sizeof(XcmsColor));
- } else {
- memcpy ((char *)pColor_return, (char *)&tmp,
- sizeof(XcmsColor));
- }
- }
- memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor));
- return(XcmsSuccess);
-}
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