diff options
Diffstat (limited to 'libX11/src/xcms/LabMxLC.c')
-rw-r--r-- | libX11/src/xcms/LabMxLC.c | 436 |
1 files changed, 218 insertions, 218 deletions
diff --git a/libX11/src/xcms/LabMxLC.c b/libX11/src/xcms/LabMxLC.c index 8cc089a22..a81c7cfbf 100644 --- a/libX11/src/xcms/LabMxLC.c +++ b/libX11/src/xcms/LabMxLC.c @@ -1,218 +1,218 @@ - -/* - * 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)); -} +
+/*
+ * 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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