diff options
Diffstat (limited to 'libX11/src/xcms/LabGcLC.c')
-rw-r--r-- | libX11/src/xcms/LabGcLC.c | 446 |
1 files changed, 223 insertions, 223 deletions
diff --git a/libX11/src/xcms/LabGcLC.c b/libX11/src/xcms/LabGcLC.c index cedaf1229..494d34e57 100644 --- a/libX11/src/xcms/LabGcLC.c +++ b/libX11/src/xcms/LabGcLC.c @@ -1,223 +1,223 @@ -
-/*
- * 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
- * CIELabGcLC.c
- *
- * DESCRIPTION
- * Source for XcmsCIELabClipLab() gamut
- * compression function.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include "Xlibint.h"
-#include "Xcmsint.h"
-#include <math.h>
-#include "Cv.h"
-
-/*
- * INTERNALS
- * Internal defines that need NOT be exported to any package or
- * program using this package.
- */
-#define MAXBISECTCOUNT 100
-
-
-/************************************************************************
- * *
- * PUBLIC ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * XcmsCIELabClipLab - Return the closest L* and chroma
- *
- * SYNOPSIS
- */
-/* ARGSUSED */
-Status
-XcmsCIELabClipLab (
- XcmsCCC ccc,
- XcmsColor *pColors_in_out,
- unsigned int nColors,
- unsigned int i,
- Bool *pCompressed)
-/*
- * DESCRIPTION
- * This routine will find the closest L* and chroma
- * for a specific hue. The color input is converted to
- * CIE L*u*v* format and returned as CIE XYZ format.
- *
- * 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;
- XcmsCCCRec myCCC;
- XcmsColor *pColor;
- XcmsColor Lab_max;
- XcmsFloat hue, chroma, maxChroma;
- XcmsFloat Chroma, bestChroma, Lstar, maxLstar, saveLstar;
- XcmsFloat bestLstar, bestastar, bestbstar;
- XcmsFloat nT, saveDist, tmpDist;
- XcmsRGBi rgb_max;
- int nCount, nMaxCount, nI, nILast;
-
- /* Use my own CCC */
- memcpy ((char *)&myCCC, (char *)ccc, sizeof(XcmsCCCRec));
- myCCC.clientWhitePt.format = XcmsUndefinedFormat;/* inherit screen white */
- myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut compression func */
-
- /*
- * 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 < StaticColor) {
- /*
- * GRAY !
- */
- _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
- 1, XcmsCIELabFormat);
- _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
- 1, XcmsCIEXYZFormat);
- if (pCompressed) {
- *(pCompressed + i) = True;
- }
- return(XcmsSuccess);
- }
-
- /* Convert from CIEXYZ to CIELab format */
- if (_XcmsDIConvertColors(&myCCC, pColor,
- ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat)
- == XcmsFailure) {
- return(XcmsFailure);
- }
-
- /* Step 1: compute the maximum L* and chroma for this hue. */
- /* This copy may be overkill but it preserves the pixel etc. */
- saveLstar = pColor->spec.CIELab.L_star;
- hue = XCMS_CIELAB_PMETRIC_HUE(pColor->spec.CIELab.a_star,
- pColor->spec.CIELab.b_star);
- chroma = XCMS_CIELAB_PMETRIC_CHROMA(pColor->spec.CIELab.a_star,
- pColor->spec.CIELab.b_star);
- memcpy((char *)&Lab_max, (char *)pColor, sizeof(XcmsColor));
- if (_XcmsCIELabQueryMaxLCRGB (&myCCC, hue, &Lab_max, &rgb_max)
- == XcmsFailure) {
- return (XcmsFailure);
- }
- maxLstar = Lab_max.spec.CIELab.L_star;
-
- /* Now check and return the appropriate L* */
- if (saveLstar == maxLstar) {
- /* When the L* input is equal to the maximum L* */
- /* merely return the maximum Lab point. */
- memcpy((char *)pColor, (char *)&Lab_max, sizeof(XcmsColor));
- retval = _XcmsDIConvertColors(&myCCC, pColor,
- ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat);
- } else {
- /* return the closest point on the hue leaf. */
- /* must do a bisection here to compute the delta e. */
- maxChroma = XCMS_CIELAB_PMETRIC_CHROMA(Lab_max.spec.CIELab.a_star,
- Lab_max.spec.CIELab.b_star);
- nMaxCount = MAXBISECTCOUNT;
- nI = nMaxCount / 2;
- bestLstar = Lstar = pColor->spec.CIELab.L_star;
- bestastar = pColor->spec.CIELab.a_star;
- bestbstar = pColor->spec.CIELab.b_star;
- bestChroma = Chroma = chroma;
- saveDist = XCMS_SQRT(((Chroma - maxChroma) * (Chroma - maxChroma)) +
- ((Lstar - maxLstar) * (Lstar - maxLstar)));
- for (nCount = 0; nCount < nMaxCount; nCount++) {
- nT = (XcmsFloat) nI / (XcmsFloat) nMaxCount;
- if (saveLstar > maxLstar) {
- pColor->spec.RGBi.red = rgb_max.red * (1.0 - nT) + nT;
- pColor->spec.RGBi.green = rgb_max.green * (1.0 - nT) + nT;
- pColor->spec.RGBi.blue = rgb_max.blue * (1.0 - nT) + nT;
- } else {
- pColor->spec.RGBi.red = rgb_max.red - (rgb_max.red * nT);
- pColor->spec.RGBi.green = rgb_max.green - (rgb_max.green * nT);
- pColor->spec.RGBi.blue = rgb_max.blue - (rgb_max.blue * nT);
- }
- pColor->format = XcmsRGBiFormat;
-
- /* Convert from RGBi to CIE Lab */
- if (_XcmsConvertColorsWithWhitePt(&myCCC, pColor,
- ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat,
- (Bool *) NULL) == XcmsFailure) {
- return (XcmsFailure);
- }
- chroma = XCMS_CIELAB_PMETRIC_CHROMA(pColor->spec.CIELab.a_star,
- pColor->spec.CIELab.b_star);
- tmpDist = XCMS_SQRT(((Chroma - chroma) * (Chroma - chroma)) +
- ((Lstar - pColor->spec.CIELab.L_star) *
- (Lstar - pColor->spec.CIELab.L_star)));
- nILast = nI;
- if (tmpDist > saveDist) {
- nI /= 2;
- } else {
- nI = (nMaxCount + nI) / 2;
- saveDist = tmpDist;
- bestLstar = pColor->spec.CIELab.L_star;
- bestastar = pColor->spec.CIELab.a_star;
- bestbstar = pColor->spec.CIELab.b_star;
- bestChroma = chroma;
- }
- if (nI == nILast || nI == 0) {
- break;
- }
- }
- if (bestChroma >= maxChroma) {
- pColor->spec.CIELab.L_star = maxLstar;
- pColor->spec.CIELab.a_star = Lab_max.spec.CIELab.a_star;
- pColor->spec.CIELab.b_star = Lab_max.spec.CIELab.b_star;
- } else {
- pColor->spec.CIELab.L_star = bestLstar;
- pColor->spec.CIELab.a_star = bestastar;
- pColor->spec.CIELab.b_star = bestbstar;
- }
- retval = _XcmsDIConvertColors(&myCCC, pColor,
- ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat);
-
- if (retval != XcmsFailure && pCompressed != NULL) {
- *(pCompressed + i) = True;
- }
- }
- return(retval);
-}
+ +/* + * 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 + * CIELabGcLC.c + * + * DESCRIPTION + * Source for XcmsCIELabClipLab() gamut + * compression function. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include "Xlibint.h" +#include "Xcmsint.h" +#include <math.h> +#include "Cv.h" + +/* + * INTERNALS + * Internal defines that need NOT be exported to any package or + * program using this package. + */ +#define MAXBISECTCOUNT 100 + + +/************************************************************************ + * * + * PUBLIC ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * XcmsCIELabClipLab - Return the closest L* and chroma + * + * SYNOPSIS + */ +/* ARGSUSED */ +Status +XcmsCIELabClipLab ( + XcmsCCC ccc, + XcmsColor *pColors_in_out, + unsigned int nColors, + unsigned int i, + Bool *pCompressed) +/* + * DESCRIPTION + * This routine will find the closest L* and chroma + * for a specific hue. The color input is converted to + * CIE L*u*v* format and returned as CIE XYZ format. + * + * 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; + XcmsCCCRec myCCC; + XcmsColor *pColor; + XcmsColor Lab_max; + XcmsFloat hue, chroma, maxChroma; + XcmsFloat Chroma, bestChroma, Lstar, maxLstar, saveLstar; + XcmsFloat bestLstar, bestastar, bestbstar; + XcmsFloat nT, saveDist, tmpDist; + XcmsRGBi rgb_max; + int nCount, nMaxCount, nI, nILast; + + /* Use my own CCC */ + memcpy ((char *)&myCCC, (char *)ccc, sizeof(XcmsCCCRec)); + myCCC.clientWhitePt.format = XcmsUndefinedFormat;/* inherit screen white */ + myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut compression func */ + + /* + * 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 < StaticColor) { + /* + * GRAY ! + */ + _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc), + 1, XcmsCIELabFormat); + _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc), + 1, XcmsCIEXYZFormat); + if (pCompressed) { + *(pCompressed + i) = True; + } + return(XcmsSuccess); + } + + /* Convert from CIEXYZ to CIELab format */ + if (_XcmsDIConvertColors(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat) + == XcmsFailure) { + return(XcmsFailure); + } + + /* Step 1: compute the maximum L* and chroma for this hue. */ + /* This copy may be overkill but it preserves the pixel etc. */ + saveLstar = pColor->spec.CIELab.L_star; + hue = XCMS_CIELAB_PMETRIC_HUE(pColor->spec.CIELab.a_star, + pColor->spec.CIELab.b_star); + chroma = XCMS_CIELAB_PMETRIC_CHROMA(pColor->spec.CIELab.a_star, + pColor->spec.CIELab.b_star); + memcpy((char *)&Lab_max, (char *)pColor, sizeof(XcmsColor)); + if (_XcmsCIELabQueryMaxLCRGB (&myCCC, hue, &Lab_max, &rgb_max) + == XcmsFailure) { + return (XcmsFailure); + } + maxLstar = Lab_max.spec.CIELab.L_star; + + /* Now check and return the appropriate L* */ + if (saveLstar == maxLstar) { + /* When the L* input is equal to the maximum L* */ + /* merely return the maximum Lab point. */ + memcpy((char *)pColor, (char *)&Lab_max, sizeof(XcmsColor)); + retval = _XcmsDIConvertColors(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat); + } else { + /* return the closest point on the hue leaf. */ + /* must do a bisection here to compute the delta e. */ + maxChroma = XCMS_CIELAB_PMETRIC_CHROMA(Lab_max.spec.CIELab.a_star, + Lab_max.spec.CIELab.b_star); + nMaxCount = MAXBISECTCOUNT; + nI = nMaxCount / 2; + bestLstar = Lstar = pColor->spec.CIELab.L_star; + bestastar = pColor->spec.CIELab.a_star; + bestbstar = pColor->spec.CIELab.b_star; + bestChroma = Chroma = chroma; + saveDist = XCMS_SQRT(((Chroma - maxChroma) * (Chroma - maxChroma)) + + ((Lstar - maxLstar) * (Lstar - maxLstar))); + for (nCount = 0; nCount < nMaxCount; nCount++) { + nT = (XcmsFloat) nI / (XcmsFloat) nMaxCount; + if (saveLstar > maxLstar) { + pColor->spec.RGBi.red = rgb_max.red * (1.0 - nT) + nT; + pColor->spec.RGBi.green = rgb_max.green * (1.0 - nT) + nT; + pColor->spec.RGBi.blue = rgb_max.blue * (1.0 - nT) + nT; + } else { + pColor->spec.RGBi.red = rgb_max.red - (rgb_max.red * nT); + pColor->spec.RGBi.green = rgb_max.green - (rgb_max.green * nT); + pColor->spec.RGBi.blue = rgb_max.blue - (rgb_max.blue * nT); + } + pColor->format = XcmsRGBiFormat; + + /* Convert from RGBi to CIE Lab */ + if (_XcmsConvertColorsWithWhitePt(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat, + (Bool *) NULL) == XcmsFailure) { + return (XcmsFailure); + } + chroma = XCMS_CIELAB_PMETRIC_CHROMA(pColor->spec.CIELab.a_star, + pColor->spec.CIELab.b_star); + tmpDist = XCMS_SQRT(((Chroma - chroma) * (Chroma - chroma)) + + ((Lstar - pColor->spec.CIELab.L_star) * + (Lstar - pColor->spec.CIELab.L_star))); + nILast = nI; + if (tmpDist > saveDist) { + nI /= 2; + } else { + nI = (nMaxCount + nI) / 2; + saveDist = tmpDist; + bestLstar = pColor->spec.CIELab.L_star; + bestastar = pColor->spec.CIELab.a_star; + bestbstar = pColor->spec.CIELab.b_star; + bestChroma = chroma; + } + if (nI == nILast || nI == 0) { + break; + } + } + if (bestChroma >= maxChroma) { + pColor->spec.CIELab.L_star = maxLstar; + pColor->spec.CIELab.a_star = Lab_max.spec.CIELab.a_star; + pColor->spec.CIELab.b_star = Lab_max.spec.CIELab.b_star; + } else { + pColor->spec.CIELab.L_star = bestLstar; + pColor->spec.CIELab.a_star = bestastar; + pColor->spec.CIELab.b_star = bestbstar; + } + retval = _XcmsDIConvertColors(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat); + + if (retval != XcmsFailure && pCompressed != NULL) { + *(pCompressed + i) = True; + } + } + return(retval); +} |