219 lines
6.3 KiB
C
219 lines
6.3 KiB
C
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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. Permission is
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* hereby granted to use, copy, modify, sell, and otherwise distribute this
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* software and its documentation for any purpose and without fee, provided
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* that this copyright, permission, and disclaimer notice is reproduced in
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* all copies of this software and in supporting documentation. TekColor
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* is a trademark of Tektronix, Inc.
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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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*
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*
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* NAME
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* CIELabMxVC.c
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*
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* DESCRIPTION
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* Source for the XcmsCIELabQueryMaxLC() gamut boundary
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* querying routine.
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*
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* DOCUMENTATION
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* "TekColor Color Management System, System Implementor's Manual"
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* and
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* Fred W. Billmeyer & Max Saltzman, "Principles of Color
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* Technology", John Wily & Sons, Inc, 1981.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "Xlibint.h"
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#include "Xcmsint.h"
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#include "Cv.h"
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/*
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* DEFINES
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*/
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#define MIN(x,y) ((x) > (y) ? (y) : (x))
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#define MIN3(x,y,z) ((x) > (MIN((y), (z))) ? (MIN((y), (z))) : (x))
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#define MAX(x,y) ((x) > (y) ? (x) : (y))
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#define MAX3(x,y,z) ((x) > (MAX((y), (z))) ? (x) : (MAX((y), (z))))
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#define START_LSTAR (XcmsFloat)40.0
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#define START_CHROMA (XcmsFloat)3.6
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/************************************************************************
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* *
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* API PRIVATE ROUTINES *
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* *
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************************************************************************/
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/*
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* NAME
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* _XcmsCIELabQueryMaxLCRGB - Compute maximum L* and chroma.
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*
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* SYNOPSIS
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*/
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Status
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_XcmsCIELabQueryMaxLCRGB(
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XcmsCCC ccc,
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XcmsFloat hue, /* hue in radians */
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XcmsColor *pColor_return,
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XcmsRGBi *pRGB_return)
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/*
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* DESCRIPTION
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* Return the maximum psychometric chroma for a specified
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* hue, and the corresponding L*. This is computed
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* by a binary search of all possible chromas. An assumption
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* is made that there are no local maxima. Use the unrounded
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* Max psychometric chroma because the difference check can be
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* small.
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*
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* NOTE: No local CCC is used because this is a private
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* routine and all routines that call it are expected
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* to behave properly, i.e. send a local CCC with
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* no white adjust function and no gamut compression
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* function.
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*
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* This routine only accepts hue in radians as input and outputs
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* Lab and RGBi.
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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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XcmsFloat nSmall, nLarge;
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XcmsColor tmp;
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tmp.format = XcmsCIELabFormat;
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/* Use some unreachable color on the given hue */
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tmp.spec.CIELab.L_star = START_LSTAR;
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tmp.spec.CIELab.a_star = XCMS_CIEASTAROFHUE(hue, START_CHROMA);
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tmp.spec.CIELab.b_star = XCMS_CIEBSTAROFHUE(hue, START_CHROMA);
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/*
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* Convert from Lab to RGB
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*
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* Note that the CIEXYZ to RGBi conversion routine must stuff the
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* out of bounds RGBi values in tmp when the ccc->gamutCompProc
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* is NULL.
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*/
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if ((_XcmsConvertColorsWithWhitePt(ccc, &tmp, ScreenWhitePointOfCCC(ccc),
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(unsigned int)1, XcmsRGBiFormat, (Bool *) NULL)
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== XcmsFailure) && tmp.format != XcmsRGBiFormat) {
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return (XcmsFailure);
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}
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/* Now pick the smallest RGB */
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nSmall = MIN3(tmp.spec.RGBi.red,
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tmp.spec.RGBi.green,
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tmp.spec.RGBi.blue);
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/* Make the smallest RGB equal to zero */
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tmp.spec.RGBi.red -= nSmall;
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tmp.spec.RGBi.green -= nSmall;
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tmp.spec.RGBi.blue -= nSmall;
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/* Now pick the largest RGB */
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nLarge = MAX3(tmp.spec.RGBi.red,
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tmp.spec.RGBi.green,
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tmp.spec.RGBi.blue);
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/* Scale the RGB values based on the largest one */
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tmp.spec.RGBi.red /= nLarge;
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tmp.spec.RGBi.green /= nLarge;
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tmp.spec.RGBi.blue /= nLarge;
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tmp.format = XcmsRGBiFormat;
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/* If the calling routine wants RGB value give them the ones used. */
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if (pRGB_return) {
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pRGB_return->red = tmp.spec.RGBi.red;
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pRGB_return->green = tmp.spec.RGBi.green;
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pRGB_return->blue = tmp.spec.RGBi.blue;
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}
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/* Convert from RGBi to Lab */
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if (_XcmsConvertColorsWithWhitePt(ccc, &tmp,
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ScreenWhitePointOfCCC(ccc), 1, XcmsCIELabFormat, (Bool *) NULL)
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== XcmsFailure) {
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return (XcmsFailure);
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}
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memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
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return (XcmsSuccess);
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}
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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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* XcmsCIELabQueryMaxLC - Compute maximum L* and chroma.
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*
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* SYNOPSIS
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*/
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Status
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XcmsCIELabQueryMaxLC (
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XcmsCCC ccc,
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XcmsFloat hue_angle, /* hue_angle in degrees */
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XcmsColor *pColor_return)
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/*
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* DESCRIPTION
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* Return the point of maximum chroma for the specified
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* hue_angle.
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*
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* ASSUMPTIONS
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* This routine assumes that the white point associated with
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* the color specification is the Screen White Point. The
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* Screen White Point will also be associated with the
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* returned color specification.
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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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XcmsCCCRec myCCC;
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/*
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* Check Arguments
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*/
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if (ccc == NULL || pColor_return == NULL) {
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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;
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myCCC.gamutCompProc = (XcmsCompressionProc)NULL;
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while (hue_angle < 0.0) {
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hue_angle += 360.0;
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}
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while (hue_angle >= 360.0) {
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hue_angle -= 360.0;
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}
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return(_XcmsCIELabQueryMaxLCRGB (&myCCC, radians(hue_angle), pColor_return,
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(XcmsRGBi *)NULL));
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}
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