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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
- * CIELabMxVC.c
- *
- * DESCRIPTION
- * Source for the XcmsCIELabQueryMaxLC() gamut boundary
- * querying routine.
- *
- * DOCUMENTATION
- * "TekColor Color Management System, System Implementor's Manual"
- * and
- * Fred W. Billmeyer & Max Saltzman, "Principles of Color
- * Technology", John Wily & Sons, Inc, 1981.
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include "Xlibint.h"
-#include "Xcmsint.h"
-#include "Cv.h"
-
-/*
- * DEFINES
- */
-#define MIN(x,y) ((x) > (y) ? (y) : (x))
-#define MIN3(x,y,z) ((x) > (MIN((y), (z))) ? (MIN((y), (z))) : (x))
-#define MAX(x,y) ((x) > (y) ? (x) : (y))
-#define MAX3(x,y,z) ((x) > (MAX((y), (z))) ? (x) : (MAX((y), (z))))
-#define START_LSTAR (XcmsFloat)40.0
-#define START_CHROMA (XcmsFloat)3.6
-
-
-/************************************************************************
- * *
- * API PRIVATE ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * _XcmsCIELabQueryMaxLCRGB - Compute maximum L* and chroma.
- *
- * SYNOPSIS
- */
-Status
-_XcmsCIELabQueryMaxLCRGB(
- XcmsCCC ccc,
- XcmsFloat hue, /* hue in radians */
- XcmsColor *pColor_return,
- XcmsRGBi *pRGB_return)
-/*
- * DESCRIPTION
- * Return the maximum psychometric chroma for a specified
- * hue, and the corresponding L*. This is computed
- * by a binary search of all possible chromas. An assumption
- * is made that there are no local maxima. Use the unrounded
- * Max psychometric chroma because the difference check can be
- * small.
- *
- * NOTE: No local CCC is used because this is a private
- * routine and all routines that call it are expected
- * to behave properly, i.e. send a local CCC with
- * no white adjust function and no gamut compression
- * function.
- *
- * This routine only accepts hue in radians as input and outputs
- * Lab and RGBi.
- *
- * RETURNS
- * XcmsFailure - Failure
- * XcmsSuccess - Succeeded
- *
- */
-{
- XcmsFloat nSmall, nLarge;
- XcmsColor tmp;
-
- tmp.format = XcmsCIELabFormat;
- /* Use some unreachable color on the given hue */
- tmp.spec.CIELab.L_star = START_LSTAR;
- tmp.spec.CIELab.a_star = XCMS_CIEASTAROFHUE(hue, START_CHROMA);
- tmp.spec.CIELab.b_star = XCMS_CIEBSTAROFHUE(hue, START_CHROMA);
- /*
- * Convert from Lab to RGB
- *
- * Note that the CIEXYZ to RGBi conversion routine must stuff the
- * out of bounds RGBi values in tmp when the ccc->gamutCompProc
- * is NULL.
- */
- if ((_XcmsConvertColorsWithWhitePt(ccc, &tmp, ScreenWhitePointOfCCC(ccc),
- (unsigned int)1, XcmsRGBiFormat, (Bool *) NULL)
- == XcmsFailure) && tmp.format != XcmsRGBiFormat) {
- return (XcmsFailure);
- }
-
- /* Now pick the smallest RGB */
- nSmall = MIN3(tmp.spec.RGBi.red,
- tmp.spec.RGBi.green,
- tmp.spec.RGBi.blue);
- /* Make the smallest RGB equal to zero */
- tmp.spec.RGBi.red -= nSmall;
- tmp.spec.RGBi.green -= nSmall;
- tmp.spec.RGBi.blue -= nSmall;
-
- /* Now pick the largest RGB */
- nLarge = MAX3(tmp.spec.RGBi.red,
- tmp.spec.RGBi.green,
- tmp.spec.RGBi.blue);
- /* Scale the RGB values based on the largest one */
- tmp.spec.RGBi.red /= nLarge;
- tmp.spec.RGBi.green /= nLarge;
- tmp.spec.RGBi.blue /= nLarge;
- tmp.format = XcmsRGBiFormat;
-
- /* If the calling routine wants RGB value give them the ones used. */
- if (pRGB_return) {
- pRGB_return->red = tmp.spec.RGBi.red;
- pRGB_return->green = tmp.spec.RGBi.green;
- pRGB_return->blue = tmp.spec.RGBi.blue;
- }
-
- /* Convert from RGBi to Lab */
- if (_XcmsConvertColorsWithWhitePt(ccc, &tmp,
- ScreenWhitePointOfCCC(ccc), 1, XcmsCIELabFormat, (Bool *) NULL)
- == XcmsFailure) {
- return (XcmsFailure);
- }
-
- memcpy((char *)pColor_return, (char *)&tmp, sizeof(XcmsColor));
- return (XcmsSuccess);
-}
-
-
-/************************************************************************
- * *
- * PUBLIC ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * XcmsCIELabQueryMaxLC - Compute maximum L* and chroma.
- *
- * SYNOPSIS
- */
-Status
-XcmsCIELabQueryMaxLC (
- XcmsCCC ccc,
- XcmsFloat hue_angle, /* hue_angle in degrees */
- XcmsColor *pColor_return)
-
-/*
- * DESCRIPTION
- * Return the point of maximum chroma for the specified
- * hue_angle.
- *
- * 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;
-
- /*
- * Check Arguments
- */
- if (ccc == NULL || pColor_return == NULL) {
- return(XcmsFailure);
- }
-
- /* Use my own CCC */
- 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;
- }
-
- return(_XcmsCIELabQueryMaxLCRGB (&myCCC, radians(hue_angle), pColor_return,
- (XcmsRGBi *)NULL));
-}
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