diff options
Diffstat (limited to 'libX11/src/xcms/HVC.c')
| -rw-r--r-- | libX11/src/xcms/HVC.c | 1250 |
1 files changed, 625 insertions, 625 deletions
diff --git a/libX11/src/xcms/HVC.c b/libX11/src/xcms/HVC.c index 80f1735cf..c5c9823e2 100644 --- a/libX11/src/xcms/HVC.c +++ b/libX11/src/xcms/HVC.c @@ -1,625 +1,625 @@ - -/* - * 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. TekColor is a - * trademark of Tektronix, Inc. The term "TekHVC" designates a particular - * color space that is the subject of U.S. Patent No. 4,985,853 (equivalent - * foreign patents pending). 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: - * - * 1. This copyright, permission, and disclaimer notice is reproduced in - * all copies of this software and any modification thereof and in - * supporting documentation; - * 2. Any color-handling application which displays TekHVC color - * cooordinates identifies these as TekHVC color coordinates in any - * interface that displays these coordinates and in any associated - * documentation; - * 3. The term "TekHVC" is always used, and is only used, in association - * with the mathematical derivations of the TekHVC Color Space, - * including those provided in this file and any equivalent pathways and - * mathematical derivations, regardless of digital (e.g., floating point - * or integer) representation. - * - * 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 - * TekHVC.c - * - * DESCRIPTION - * This file contains routines that support the TekHVC - * color space to include conversions to and from the CIE - * XYZ space. - * - * DOCUMENTATION - * "TekColor Color Management System, System Implementor's Manual" - */ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif -#include "Xlibint.h" -#include "Xcmsint.h" -#include <X11/Xos.h> -#include <math.h> -#include "Cv.h" - -#include <stdio.h> - -/* - * DEFINES - */ -#define u_BR 0.7127 /* u' Best Red */ -#define v_BR 0.4931 /* v' Best Red */ -#define EPS 0.001 -#define CHROMA_SCALE_FACTOR 7.50725 -#ifndef PI -# ifdef M_PI -# define PI M_PI -# else -# define PI 3.14159265358979323846264338327950 -# endif -#endif -#ifndef degrees -# define degrees(r) ((XcmsFloat)(r) * 180.0 / PI) -#endif /* degrees */ -#ifndef radians -# define radians(d) ((XcmsFloat)(d) * PI / 180.0) -#endif /* radians */ - -/************************************************************************* - * Note: The DBL_EPSILON for ANSI is 1e-5 so my checks need to take - * this into account. If your DBL_EPSILON is different then - * adjust this define. - * - * Also note that EPS is the error factor in the calculations - * This may need to be the same as XMY_DBL_EPSILON in - * some implementations. - **************************************************************************/ -#ifdef DBL_EPSILON -# define XMY_DBL_EPSILON DBL_EPSILON -#else -# define XMY_DBL_EPSILON 0.00001 -#endif - -/* - * FORWARD DECLARATIONS - */ -static int TekHVC_ParseString(register char *spec, XcmsColor *pColor); -static Status XcmsTekHVC_ValidSpec(XcmsColor *pColor); - -/* - * LOCAL VARIABLES - */ - - /* - * NULL terminated list of functions applied to get from TekHVC to CIEXYZ - */ -static XcmsConversionProc Fl_TekHVC_to_CIEXYZ[] = { - XcmsTekHVCToCIEuvY, - XcmsCIEuvYToCIEXYZ, - NULL -}; - - /* - * NULL terminated list of functions applied to get from CIEXYZ to TekHVC - */ -static XcmsConversionProc Fl_CIEXYZ_to_TekHVC[] = { - XcmsCIEXYZToCIEuvY, - XcmsCIEuvYToTekHVC, - NULL -}; - -/* - * GLOBALS - */ - - /* - * TekHVC Color Space - */ -XcmsColorSpace XcmsTekHVCColorSpace = - { - _XcmsTekHVC_prefix, /* prefix */ - XcmsTekHVCFormat, /* id */ - TekHVC_ParseString, /* parseString */ - Fl_TekHVC_to_CIEXYZ, /* to_CIEXYZ */ - Fl_CIEXYZ_to_TekHVC, /* from_CIEXYZ */ - 1 - }; - - - - -/************************************************************************ - * * - * PRIVATE ROUTINES * - * * - ************************************************************************/ - -/* - * NAME - * TekHVC_ParseString - * - * SYNOPSIS - */ -static int -TekHVC_ParseString( - register char *spec, - XcmsColor *pColor) -/* - * DESCRIPTION - * This routines takes a string and attempts to convert - * it into a XcmsColor structure with XcmsTekHVCFormat. - * The assumed TekHVC string syntax is: - * TekHVC:<H>/<V>/<C> - * Where H, V, and C are in string input format for floats - * consisting of: - * a. an optional sign - * b. a string of numbers possibly containing a decimal point, - * c. an optional exponent field containing an 'E' or 'e' - * followed by a possibly signed integer string. - * - * RETURNS - * XcmsFailure if invalid; - * XcmsSuccess if valid. - */ -{ - int n; - char *pchar; - - if ((pchar = strchr(spec, ':')) == NULL) { - return(XcmsFailure); - } - n = (int)(pchar - spec); - - /* - * Check for proper prefix. - */ - if (strncmp(spec, _XcmsTekHVC_prefix, n) != 0) { - return(XcmsFailure); - } - - /* - * Attempt to parse the value portion. - */ - if (sscanf(spec + n + 1, "%lf/%lf/%lf", - &pColor->spec.TekHVC.H, - &pColor->spec.TekHVC.V, - &pColor->spec.TekHVC.C) != 3) { - char *s; /* Maybe failed due to locale */ - int f; - if ((s = strdup(spec))) { - for (f = 0; s[f]; ++f) - if (s[f] == '.') - s[f] = ','; - else if (s[f] == ',') - s[f] = '.'; - if (sscanf(s + n + 1, "%lf/%lf/%lf", - &pColor->spec.TekHVC.H, - &pColor->spec.TekHVC.V, - &pColor->spec.TekHVC.C) != 3) { - free(s); - return(XcmsFailure); - } - free(s); - } else - return(XcmsFailure); - } - pColor->format = XcmsTekHVCFormat; - pColor->pixel = 0; - return(XcmsTekHVC_ValidSpec(pColor)); -} - - -/* - * NAME - * ThetaOffset -- compute thetaOffset - * - * SYNOPSIS - */ -static int -ThetaOffset( - XcmsColor *pWhitePt, - XcmsFloat *pThetaOffset) -/* - * DESCRIPTION - * This routine computes the theta offset of a given - * white point, i.e. XcmsColor. It is used in both this - * conversion and the printer conversions. - * - * RETURNS - * 0 if failed. - * 1 if succeeded with no modifications. - * - * ASSUMPTIONS - * Assumes: - * pWhitePt != NULL - * pWhitePt->format == XcmsCIEuvYFormat - * - */ -{ - double div, slopeuv; - - if (pWhitePt == NULL || pWhitePt->format != XcmsCIEuvYFormat) { - return(0); - } - - if ((div = u_BR - pWhitePt->spec.CIEuvY.u_prime) == 0.0) { - return(0); - } - slopeuv = (v_BR - pWhitePt->spec.CIEuvY.v_prime) / div; - *pThetaOffset = degrees(XCMS_ATAN(slopeuv)); - return(1); -} - - - -/************************************************************************ - * * - * PUBLIC ROUTINES * - * * - ************************************************************************/ - -/* - * NAME - * XcmsTekHVC_ValidSpec() - * - * SYNOPSIS - */ -static int -XcmsTekHVC_ValidSpec( - XcmsColor *pColor) -/* - * DESCRIPTION - * Checks if values in the color specification are valid. - * Also brings hue into the range 0.0 <= Hue < 360.0 - * - * RETURNS - * 0 if not valid. - * 1 if valid. - * - */ -{ - if (pColor->format != XcmsTekHVCFormat) { - return(XcmsFailure); - } - if (pColor->spec.TekHVC.V < (0.0 - XMY_DBL_EPSILON) - || pColor->spec.TekHVC.V > (100.0 + XMY_DBL_EPSILON) - || (pColor->spec.TekHVC.C < 0.0 - XMY_DBL_EPSILON)) { - return(XcmsFailure); - } - - if (pColor->spec.TekHVC.V < 0.0) { - pColor->spec.TekHVC.V = 0.0 + XMY_DBL_EPSILON; - } else if (pColor->spec.TekHVC.V > 100.0) { - pColor->spec.TekHVC.V = 100.0 - XMY_DBL_EPSILON; - } - - if (pColor->spec.TekHVC.C < 0.0) { - pColor->spec.TekHVC.C = 0.0 - XMY_DBL_EPSILON; - } - - while (pColor->spec.TekHVC.H < 0.0) { - pColor->spec.TekHVC.H += 360.0; - } - while (pColor->spec.TekHVC.H >= 360.0) { - pColor->spec.TekHVC.H -= 360.0; - } - return(XcmsSuccess); -} - -/* - * NAME - * XcmsTekHVCToCIEuvY - convert TekHVC to CIEuvY - * - * SYNOPSIS - */ -Status -XcmsTekHVCToCIEuvY( - XcmsCCC ccc, - XcmsColor *pHVC_WhitePt, - XcmsColor *pColors_in_out, - unsigned int nColors) -/* - * DESCRIPTION - * Transforms an array of TekHVC color specifications, given - * their associated white point, to CIECIEuvY.color - * specifications. - * - * RETURNS - * XcmsFailure if failed, XcmsSuccess otherwise. - * - */ -{ - XcmsFloat thetaOffset; - XcmsColor *pColor = pColors_in_out; - XcmsColor whitePt; - XcmsCIEuvY uvY_return; - XcmsFloat tempHue, u, v; - XcmsFloat tmpVal; - register int i; - - /* - * Check arguments - */ - if (pHVC_WhitePt == NULL || pColors_in_out == NULL) { - return(XcmsFailure); - } - - /* - * Make sure white point is in CIEuvY form - */ - if (pHVC_WhitePt->format != XcmsCIEuvYFormat) { - /* Make copy of the white point because we're going to modify it */ - memcpy((char *)&whitePt, (char *)pHVC_WhitePt, sizeof(XcmsColor)); - if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1, - XcmsCIEuvYFormat)) { - return(XcmsFailure); - } - pHVC_WhitePt = &whitePt; - } - /* Make sure it is a white point, i.e., Y == 1.0 */ - if (pHVC_WhitePt->spec.CIEuvY.Y != 1.0) { - return(XcmsFailure); - } - - /* Get the thetaOffset */ - if (!ThetaOffset(pHVC_WhitePt, &thetaOffset)) { - return(XcmsFailure); - } - - /* - * Now convert each XcmsColor structure to CIEXYZ form - */ - for (i = 0; i < nColors; i++, pColor++) { - - /* Make sure original format is TekHVC and is valid */ - if (!XcmsTekHVC_ValidSpec(pColor)) { - return(XcmsFailure); - } - - if (pColor->spec.TekHVC.V == 0.0 || pColor->spec.TekHVC.V == 100.0) { - if (pColor->spec.TekHVC.V == 100.0) { - uvY_return.Y = 1.0; - } else { /* pColor->spec.TekHVC.V == 0.0 */ - uvY_return.Y = 0.0; - } - uvY_return.u_prime = pHVC_WhitePt->spec.CIEuvY.u_prime; - uvY_return.v_prime = pHVC_WhitePt->spec.CIEuvY.v_prime; - } else { - - /* Find the hue based on the white point offset */ - tempHue = pColor->spec.TekHVC.H + thetaOffset; - - while (tempHue < 0.0) { - tempHue += 360.0; - } - while (tempHue >= 360.0) { - tempHue -= 360.0; - } - - tempHue = radians(tempHue); - - /* Calculate u'v' for the obtained hue */ - u = (XcmsFloat) ((XCMS_COS(tempHue) * pColor->spec.TekHVC.C) / - (pColor->spec.TekHVC.V * (double)CHROMA_SCALE_FACTOR)); - v = (XcmsFloat) ((XCMS_SIN(tempHue) * pColor->spec.TekHVC.C) / - (pColor->spec.TekHVC.V * (double)CHROMA_SCALE_FACTOR)); - - /* Based on the white point get the offset from best red */ - uvY_return.u_prime = u + pHVC_WhitePt->spec.CIEuvY.u_prime; - uvY_return.v_prime = v + pHVC_WhitePt->spec.CIEuvY.v_prime; - - /* Calculate the Y value based on the L* = V. */ - if (pColor->spec.TekHVC.V < 7.99953624) { - uvY_return.Y = pColor->spec.TekHVC.V / 903.29; - } else { - tmpVal = (pColor->spec.TekHVC.V + 16.0) / 116.0; - uvY_return.Y = tmpVal * tmpVal * tmpVal; /* tmpVal ** 3 */ - } - } - - /* Copy result to pColor */ - memcpy((char *)&pColor->spec, (char *)&uvY_return, sizeof(XcmsCIEuvY)); - - /* Identify that the format is now CIEuvY */ - pColor->format = XcmsCIEuvYFormat; - } - return(XcmsSuccess); -} - - -/* - * NAME - * XcmsCIEuvYToTekHVC - convert CIEuvY to TekHVC - * - * SYNOPSIS - */ -Status -XcmsCIEuvYToTekHVC( - XcmsCCC ccc, - XcmsColor *pHVC_WhitePt, - XcmsColor *pColors_in_out, - unsigned int nColors) -/* - * DESCRIPTION - * Transforms an array of CIECIEuvY.color specifications, given - * their assiciated white point, to TekHVC specifications. - * - * RETURNS - * XcmsFailure if failed, XcmsSuccess otherwise. - * - */ -{ - XcmsFloat theta, L2, u, v, nThetaLow, nThetaHigh; - XcmsFloat thetaOffset; - XcmsColor *pColor = pColors_in_out; - XcmsColor whitePt; - XcmsTekHVC HVC_return; - register int i; - - /* - * Check arguments - */ - if (pHVC_WhitePt == NULL || pColors_in_out == NULL) { - return(XcmsFailure); - } - - /* - * Make sure white point is in CIEuvY form - */ - if (pHVC_WhitePt->format != XcmsCIEuvYFormat) { - /* Make copy of the white point because we're going to modify it */ - memcpy((char *)&whitePt, (char *)pHVC_WhitePt, sizeof(XcmsColor)); - if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1, - XcmsCIEuvYFormat)) { - return(XcmsFailure); - } - pHVC_WhitePt = &whitePt; - } - /* Make sure it is a white point, i.e., Y == 1.0 */ - if (pHVC_WhitePt->spec.CIEuvY.Y != 1.0) { - return(XcmsFailure); - } - if (!ThetaOffset(pHVC_WhitePt, &thetaOffset)) { - return(XcmsFailure); - } - - /* - * Now convert each XcmsColor structure to CIEXYZ form - */ - for (i = 0; i < nColors; i++, pColor++) { - if (!_XcmsCIEuvY_ValidSpec(pColor)) { - return(XcmsFailure); - } - - /* Use the white point offset to determine HVC */ - u = pColor->spec.CIEuvY.u_prime - pHVC_WhitePt->spec.CIEuvY.u_prime; - v = pColor->spec.CIEuvY.v_prime - pHVC_WhitePt->spec.CIEuvY.v_prime; - - /* Calculate the offset */ - if (u == 0.0) { - theta = 0.0; - } else { - theta = v / u; - theta = (XcmsFloat) XCMS_ATAN((double)theta); - theta = degrees(theta); - } - - nThetaLow = 0.0; - nThetaHigh = 360.0; - if (u > 0.0 && v > 0.0) { - nThetaLow = 0.0; - nThetaHigh = 90.0; - } else if (u < 0.0 && v > 0.0) { - nThetaLow = 90.0; - nThetaHigh = 180.0; - } else if (u < 0.0 && v < 0.0) { - nThetaLow = 180.0; - nThetaHigh = 270.0; - } else if (u > 0.0 && v < 0.0) { - nThetaLow = 270.0; - nThetaHigh = 360.0; - } - while (theta < nThetaLow) { - theta += 90.0; - } - while (theta >= nThetaHigh) { - theta -= 90.0; - } - - /* calculate the L value from the given Y */ - L2 = (pColor->spec.CIEuvY.Y < 0.008856) - ? - (pColor->spec.CIEuvY.Y * 903.29) - : - ((XcmsFloat)(XCMS_CUBEROOT(pColor->spec.CIEuvY.Y) * 116.0) - 16.0); - HVC_return.C = L2 * CHROMA_SCALE_FACTOR * XCMS_SQRT((double) ((u * u) + (v * v))); - if (HVC_return.C < 0.0) { - theta = 0.0; - } - HVC_return.V = L2; - HVC_return.H = theta - thetaOffset; - - /* - * If this is within the error margin let some other routine later - * in the chain worry about the slop in the calculations. - */ - while (HVC_return.H < -EPS) { - HVC_return.H += 360.0; - } - while (HVC_return.H >= 360.0 + EPS) { - HVC_return.H -= 360.0; - } - - /* Copy result to pColor */ - memcpy((char *)&pColor->spec, (char *)&HVC_return, sizeof(XcmsTekHVC)); - - /* Identify that the format is now CIEuvY */ - pColor->format = XcmsTekHVCFormat; - } - return(XcmsSuccess); -} - - -/* - * NAME - * _XcmsTekHVC_CheckModify - * - * SYNOPSIS - */ -int -_XcmsTekHVC_CheckModify( - XcmsColor *pColor) -/* - * DESCRIPTION - * Checks if values in the color specification are valid. - * If they are not it modifies the values. - * Also brings hue into the range 0.0 <= Hue < 360.0 - * - * RETURNS - * 0 if not valid. - * 1 if valid. - * - */ -{ - int n; - - /* For now only use the TekHVC numbers as inputs */ - if (pColor->format != XcmsTekHVCFormat) { - return(0); - } - - if (pColor->spec.TekHVC.V < 0.0) { - pColor->spec.TekHVC.V = 0.0 + XMY_DBL_EPSILON; - } else if (pColor->spec.TekHVC.V > 100.0) { - pColor->spec.TekHVC.V = 100.0 - XMY_DBL_EPSILON; - } - - if (pColor->spec.TekHVC.C < 0.0) { - pColor->spec.TekHVC.C = 0.0 - XMY_DBL_EPSILON; - } - - if (pColor->spec.TekHVC.H < 0.0) { - n = -pColor->spec.TekHVC.H / 360.0; - pColor->spec.TekHVC.H += (n + 1) * 360.0; - if (pColor->spec.TekHVC.H >= 360.0) - pColor->spec.TekHVC.H -= 360.0; - } else if (pColor->spec.TekHVC.H >= 360.0) { - n = pColor->spec.TekHVC.H / 360.0; - pColor->spec.TekHVC.H -= n * 360.0; - } - return(1); -} +
+/*
+ * 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. TekColor is a
+ * trademark of Tektronix, Inc. The term "TekHVC" designates a particular
+ * color space that is the subject of U.S. Patent No. 4,985,853 (equivalent
+ * foreign patents pending). 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:
+ *
+ * 1. This copyright, permission, and disclaimer notice is reproduced in
+ * all copies of this software and any modification thereof and in
+ * supporting documentation;
+ * 2. Any color-handling application which displays TekHVC color
+ * cooordinates identifies these as TekHVC color coordinates in any
+ * interface that displays these coordinates and in any associated
+ * documentation;
+ * 3. The term "TekHVC" is always used, and is only used, in association
+ * with the mathematical derivations of the TekHVC Color Space,
+ * including those provided in this file and any equivalent pathways and
+ * mathematical derivations, regardless of digital (e.g., floating point
+ * or integer) representation.
+ *
+ * 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
+ * TekHVC.c
+ *
+ * DESCRIPTION
+ * This file contains routines that support the TekHVC
+ * color space to include conversions to and from the CIE
+ * XYZ space.
+ *
+ * DOCUMENTATION
+ * "TekColor Color Management System, System Implementor's Manual"
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include <X11/Xos.h>
+#include <math.h>
+#include "Cv.h"
+
+#include <stdio.h>
+
+/*
+ * DEFINES
+ */
+#define u_BR 0.7127 /* u' Best Red */
+#define v_BR 0.4931 /* v' Best Red */
+#define EPS 0.001
+#define CHROMA_SCALE_FACTOR 7.50725
+#ifndef PI
+# ifdef M_PI
+# define PI M_PI
+# else
+# define PI 3.14159265358979323846264338327950
+# endif
+#endif
+#ifndef degrees
+# define degrees(r) ((XcmsFloat)(r) * 180.0 / PI)
+#endif /* degrees */
+#ifndef radians
+# define radians(d) ((XcmsFloat)(d) * PI / 180.0)
+#endif /* radians */
+
+/*************************************************************************
+ * Note: The DBL_EPSILON for ANSI is 1e-5 so my checks need to take
+ * this into account. If your DBL_EPSILON is different then
+ * adjust this define.
+ *
+ * Also note that EPS is the error factor in the calculations
+ * This may need to be the same as XMY_DBL_EPSILON in
+ * some implementations.
+ **************************************************************************/
+#ifdef DBL_EPSILON
+# define XMY_DBL_EPSILON DBL_EPSILON
+#else
+# define XMY_DBL_EPSILON 0.00001
+#endif
+
+/*
+ * FORWARD DECLARATIONS
+ */
+static int TekHVC_ParseString(register char *spec, XcmsColor *pColor);
+static Status XcmsTekHVC_ValidSpec(XcmsColor *pColor);
+
+/*
+ * LOCAL VARIABLES
+ */
+
+ /*
+ * NULL terminated list of functions applied to get from TekHVC to CIEXYZ
+ */
+static XcmsConversionProc Fl_TekHVC_to_CIEXYZ[] = {
+ XcmsTekHVCToCIEuvY,
+ XcmsCIEuvYToCIEXYZ,
+ NULL
+};
+
+ /*
+ * NULL terminated list of functions applied to get from CIEXYZ to TekHVC
+ */
+static XcmsConversionProc Fl_CIEXYZ_to_TekHVC[] = {
+ XcmsCIEXYZToCIEuvY,
+ XcmsCIEuvYToTekHVC,
+ NULL
+};
+
+/*
+ * GLOBALS
+ */
+
+ /*
+ * TekHVC Color Space
+ */
+XcmsColorSpace XcmsTekHVCColorSpace =
+ {
+ _XcmsTekHVC_prefix, /* prefix */
+ XcmsTekHVCFormat, /* id */
+ TekHVC_ParseString, /* parseString */
+ Fl_TekHVC_to_CIEXYZ, /* to_CIEXYZ */
+ Fl_CIEXYZ_to_TekHVC, /* from_CIEXYZ */
+ 1
+ };
+
+
+
+
+/************************************************************************
+ * *
+ * PRIVATE ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * TekHVC_ParseString
+ *
+ * SYNOPSIS
+ */
+static int
+TekHVC_ParseString(
+ register char *spec,
+ XcmsColor *pColor)
+/*
+ * DESCRIPTION
+ * This routines takes a string and attempts to convert
+ * it into a XcmsColor structure with XcmsTekHVCFormat.
+ * The assumed TekHVC string syntax is:
+ * TekHVC:<H>/<V>/<C>
+ * Where H, V, and C are in string input format for floats
+ * consisting of:
+ * a. an optional sign
+ * b. a string of numbers possibly containing a decimal point,
+ * c. an optional exponent field containing an 'E' or 'e'
+ * followed by a possibly signed integer string.
+ *
+ * RETURNS
+ * XcmsFailure if invalid;
+ * XcmsSuccess if valid.
+ */
+{
+ int n;
+ char *pchar;
+
+ if ((pchar = strchr(spec, ':')) == NULL) {
+ return(XcmsFailure);
+ }
+ n = (int)(pchar - spec);
+
+ /*
+ * Check for proper prefix.
+ */
+ if (strncmp(spec, _XcmsTekHVC_prefix, n) != 0) {
+ return(XcmsFailure);
+ }
+
+ /*
+ * Attempt to parse the value portion.
+ */
+ if (sscanf(spec + n + 1, "%lf/%lf/%lf",
+ &pColor->spec.TekHVC.H,
+ &pColor->spec.TekHVC.V,
+ &pColor->spec.TekHVC.C) != 3) {
+ char *s; /* Maybe failed due to locale */
+ int f;
+ if ((s = strdup(spec))) {
+ for (f = 0; s[f]; ++f)
+ if (s[f] == '.')
+ s[f] = ',';
+ else if (s[f] == ',')
+ s[f] = '.';
+ if (sscanf(s + n + 1, "%lf/%lf/%lf",
+ &pColor->spec.TekHVC.H,
+ &pColor->spec.TekHVC.V,
+ &pColor->spec.TekHVC.C) != 3) {
+ free(s);
+ return(XcmsFailure);
+ }
+ free(s);
+ } else
+ return(XcmsFailure);
+ }
+ pColor->format = XcmsTekHVCFormat;
+ pColor->pixel = 0;
+ return(XcmsTekHVC_ValidSpec(pColor));
+}
+
+
+/*
+ * NAME
+ * ThetaOffset -- compute thetaOffset
+ *
+ * SYNOPSIS
+ */
+static int
+ThetaOffset(
+ XcmsColor *pWhitePt,
+ XcmsFloat *pThetaOffset)
+/*
+ * DESCRIPTION
+ * This routine computes the theta offset of a given
+ * white point, i.e. XcmsColor. It is used in both this
+ * conversion and the printer conversions.
+ *
+ * RETURNS
+ * 0 if failed.
+ * 1 if succeeded with no modifications.
+ *
+ * ASSUMPTIONS
+ * Assumes:
+ * pWhitePt != NULL
+ * pWhitePt->format == XcmsCIEuvYFormat
+ *
+ */
+{
+ double div, slopeuv;
+
+ if (pWhitePt == NULL || pWhitePt->format != XcmsCIEuvYFormat) {
+ return(0);
+ }
+
+ if ((div = u_BR - pWhitePt->spec.CIEuvY.u_prime) == 0.0) {
+ return(0);
+ }
+ slopeuv = (v_BR - pWhitePt->spec.CIEuvY.v_prime) / div;
+ *pThetaOffset = degrees(XCMS_ATAN(slopeuv));
+ return(1);
+}
+
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * XcmsTekHVC_ValidSpec()
+ *
+ * SYNOPSIS
+ */
+static int
+XcmsTekHVC_ValidSpec(
+ XcmsColor *pColor)
+/*
+ * DESCRIPTION
+ * Checks if values in the color specification are valid.
+ * Also brings hue into the range 0.0 <= Hue < 360.0
+ *
+ * RETURNS
+ * 0 if not valid.
+ * 1 if valid.
+ *
+ */
+{
+ if (pColor->format != XcmsTekHVCFormat) {
+ return(XcmsFailure);
+ }
+ if (pColor->spec.TekHVC.V < (0.0 - XMY_DBL_EPSILON)
+ || pColor->spec.TekHVC.V > (100.0 + XMY_DBL_EPSILON)
+ || (pColor->spec.TekHVC.C < 0.0 - XMY_DBL_EPSILON)) {
+ return(XcmsFailure);
+ }
+
+ if (pColor->spec.TekHVC.V < 0.0) {
+ pColor->spec.TekHVC.V = 0.0 + XMY_DBL_EPSILON;
+ } else if (pColor->spec.TekHVC.V > 100.0) {
+ pColor->spec.TekHVC.V = 100.0 - XMY_DBL_EPSILON;
+ }
+
+ if (pColor->spec.TekHVC.C < 0.0) {
+ pColor->spec.TekHVC.C = 0.0 - XMY_DBL_EPSILON;
+ }
+
+ while (pColor->spec.TekHVC.H < 0.0) {
+ pColor->spec.TekHVC.H += 360.0;
+ }
+ while (pColor->spec.TekHVC.H >= 360.0) {
+ pColor->spec.TekHVC.H -= 360.0;
+ }
+ return(XcmsSuccess);
+}
+
+/*
+ * NAME
+ * XcmsTekHVCToCIEuvY - convert TekHVC to CIEuvY
+ *
+ * SYNOPSIS
+ */
+Status
+XcmsTekHVCToCIEuvY(
+ XcmsCCC ccc,
+ XcmsColor *pHVC_WhitePt,
+ XcmsColor *pColors_in_out,
+ unsigned int nColors)
+/*
+ * DESCRIPTION
+ * Transforms an array of TekHVC color specifications, given
+ * their associated white point, to CIECIEuvY.color
+ * specifications.
+ *
+ * RETURNS
+ * XcmsFailure if failed, XcmsSuccess otherwise.
+ *
+ */
+{
+ XcmsFloat thetaOffset;
+ XcmsColor *pColor = pColors_in_out;
+ XcmsColor whitePt;
+ XcmsCIEuvY uvY_return;
+ XcmsFloat tempHue, u, v;
+ XcmsFloat tmpVal;
+ register int i;
+
+ /*
+ * Check arguments
+ */
+ if (pHVC_WhitePt == NULL || pColors_in_out == NULL) {
+ return(XcmsFailure);
+ }
+
+ /*
+ * Make sure white point is in CIEuvY form
+ */
+ if (pHVC_WhitePt->format != XcmsCIEuvYFormat) {
+ /* Make copy of the white point because we're going to modify it */
+ memcpy((char *)&whitePt, (char *)pHVC_WhitePt, sizeof(XcmsColor));
+ if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1,
+ XcmsCIEuvYFormat)) {
+ return(XcmsFailure);
+ }
+ pHVC_WhitePt = &whitePt;
+ }
+ /* Make sure it is a white point, i.e., Y == 1.0 */
+ if (pHVC_WhitePt->spec.CIEuvY.Y != 1.0) {
+ return(XcmsFailure);
+ }
+
+ /* Get the thetaOffset */
+ if (!ThetaOffset(pHVC_WhitePt, &thetaOffset)) {
+ return(XcmsFailure);
+ }
+
+ /*
+ * Now convert each XcmsColor structure to CIEXYZ form
+ */
+ for (i = 0; i < nColors; i++, pColor++) {
+
+ /* Make sure original format is TekHVC and is valid */
+ if (!XcmsTekHVC_ValidSpec(pColor)) {
+ return(XcmsFailure);
+ }
+
+ if (pColor->spec.TekHVC.V == 0.0 || pColor->spec.TekHVC.V == 100.0) {
+ if (pColor->spec.TekHVC.V == 100.0) {
+ uvY_return.Y = 1.0;
+ } else { /* pColor->spec.TekHVC.V == 0.0 */
+ uvY_return.Y = 0.0;
+ }
+ uvY_return.u_prime = pHVC_WhitePt->spec.CIEuvY.u_prime;
+ uvY_return.v_prime = pHVC_WhitePt->spec.CIEuvY.v_prime;
+ } else {
+
+ /* Find the hue based on the white point offset */
+ tempHue = pColor->spec.TekHVC.H + thetaOffset;
+
+ while (tempHue < 0.0) {
+ tempHue += 360.0;
+ }
+ while (tempHue >= 360.0) {
+ tempHue -= 360.0;
+ }
+
+ tempHue = radians(tempHue);
+
+ /* Calculate u'v' for the obtained hue */
+ u = (XcmsFloat) ((XCMS_COS(tempHue) * pColor->spec.TekHVC.C) /
+ (pColor->spec.TekHVC.V * (double)CHROMA_SCALE_FACTOR));
+ v = (XcmsFloat) ((XCMS_SIN(tempHue) * pColor->spec.TekHVC.C) /
+ (pColor->spec.TekHVC.V * (double)CHROMA_SCALE_FACTOR));
+
+ /* Based on the white point get the offset from best red */
+ uvY_return.u_prime = u + pHVC_WhitePt->spec.CIEuvY.u_prime;
+ uvY_return.v_prime = v + pHVC_WhitePt->spec.CIEuvY.v_prime;
+
+ /* Calculate the Y value based on the L* = V. */
+ if (pColor->spec.TekHVC.V < 7.99953624) {
+ uvY_return.Y = pColor->spec.TekHVC.V / 903.29;
+ } else {
+ tmpVal = (pColor->spec.TekHVC.V + 16.0) / 116.0;
+ uvY_return.Y = tmpVal * tmpVal * tmpVal; /* tmpVal ** 3 */
+ }
+ }
+
+ /* Copy result to pColor */
+ memcpy((char *)&pColor->spec, (char *)&uvY_return, sizeof(XcmsCIEuvY));
+
+ /* Identify that the format is now CIEuvY */
+ pColor->format = XcmsCIEuvYFormat;
+ }
+ return(XcmsSuccess);
+}
+
+
+/*
+ * NAME
+ * XcmsCIEuvYToTekHVC - convert CIEuvY to TekHVC
+ *
+ * SYNOPSIS
+ */
+Status
+XcmsCIEuvYToTekHVC(
+ XcmsCCC ccc,
+ XcmsColor *pHVC_WhitePt,
+ XcmsColor *pColors_in_out,
+ unsigned int nColors)
+/*
+ * DESCRIPTION
+ * Transforms an array of CIECIEuvY.color specifications, given
+ * their assiciated white point, to TekHVC specifications.
+ *
+ * RETURNS
+ * XcmsFailure if failed, XcmsSuccess otherwise.
+ *
+ */
+{
+ XcmsFloat theta, L2, u, v, nThetaLow, nThetaHigh;
+ XcmsFloat thetaOffset;
+ XcmsColor *pColor = pColors_in_out;
+ XcmsColor whitePt;
+ XcmsTekHVC HVC_return;
+ register int i;
+
+ /*
+ * Check arguments
+ */
+ if (pHVC_WhitePt == NULL || pColors_in_out == NULL) {
+ return(XcmsFailure);
+ }
+
+ /*
+ * Make sure white point is in CIEuvY form
+ */
+ if (pHVC_WhitePt->format != XcmsCIEuvYFormat) {
+ /* Make copy of the white point because we're going to modify it */
+ memcpy((char *)&whitePt, (char *)pHVC_WhitePt, sizeof(XcmsColor));
+ if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1,
+ XcmsCIEuvYFormat)) {
+ return(XcmsFailure);
+ }
+ pHVC_WhitePt = &whitePt;
+ }
+ /* Make sure it is a white point, i.e., Y == 1.0 */
+ if (pHVC_WhitePt->spec.CIEuvY.Y != 1.0) {
+ return(XcmsFailure);
+ }
+ if (!ThetaOffset(pHVC_WhitePt, &thetaOffset)) {
+ return(XcmsFailure);
+ }
+
+ /*
+ * Now convert each XcmsColor structure to CIEXYZ form
+ */
+ for (i = 0; i < nColors; i++, pColor++) {
+ if (!_XcmsCIEuvY_ValidSpec(pColor)) {
+ return(XcmsFailure);
+ }
+
+ /* Use the white point offset to determine HVC */
+ u = pColor->spec.CIEuvY.u_prime - pHVC_WhitePt->spec.CIEuvY.u_prime;
+ v = pColor->spec.CIEuvY.v_prime - pHVC_WhitePt->spec.CIEuvY.v_prime;
+
+ /* Calculate the offset */
+ if (u == 0.0) {
+ theta = 0.0;
+ } else {
+ theta = v / u;
+ theta = (XcmsFloat) XCMS_ATAN((double)theta);
+ theta = degrees(theta);
+ }
+
+ nThetaLow = 0.0;
+ nThetaHigh = 360.0;
+ if (u > 0.0 && v > 0.0) {
+ nThetaLow = 0.0;
+ nThetaHigh = 90.0;
+ } else if (u < 0.0 && v > 0.0) {
+ nThetaLow = 90.0;
+ nThetaHigh = 180.0;
+ } else if (u < 0.0 && v < 0.0) {
+ nThetaLow = 180.0;
+ nThetaHigh = 270.0;
+ } else if (u > 0.0 && v < 0.0) {
+ nThetaLow = 270.0;
+ nThetaHigh = 360.0;
+ }
+ while (theta < nThetaLow) {
+ theta += 90.0;
+ }
+ while (theta >= nThetaHigh) {
+ theta -= 90.0;
+ }
+
+ /* calculate the L value from the given Y */
+ L2 = (pColor->spec.CIEuvY.Y < 0.008856)
+ ?
+ (pColor->spec.CIEuvY.Y * 903.29)
+ :
+ ((XcmsFloat)(XCMS_CUBEROOT(pColor->spec.CIEuvY.Y) * 116.0) - 16.0);
+ HVC_return.C = L2 * CHROMA_SCALE_FACTOR * XCMS_SQRT((double) ((u * u) + (v * v)));
+ if (HVC_return.C < 0.0) {
+ theta = 0.0;
+ }
+ HVC_return.V = L2;
+ HVC_return.H = theta - thetaOffset;
+
+ /*
+ * If this is within the error margin let some other routine later
+ * in the chain worry about the slop in the calculations.
+ */
+ while (HVC_return.H < -EPS) {
+ HVC_return.H += 360.0;
+ }
+ while (HVC_return.H >= 360.0 + EPS) {
+ HVC_return.H -= 360.0;
+ }
+
+ /* Copy result to pColor */
+ memcpy((char *)&pColor->spec, (char *)&HVC_return, sizeof(XcmsTekHVC));
+
+ /* Identify that the format is now CIEuvY */
+ pColor->format = XcmsTekHVCFormat;
+ }
+ return(XcmsSuccess);
+}
+
+
+/*
+ * NAME
+ * _XcmsTekHVC_CheckModify
+ *
+ * SYNOPSIS
+ */
+int
+_XcmsTekHVC_CheckModify(
+ XcmsColor *pColor)
+/*
+ * DESCRIPTION
+ * Checks if values in the color specification are valid.
+ * If they are not it modifies the values.
+ * Also brings hue into the range 0.0 <= Hue < 360.0
+ *
+ * RETURNS
+ * 0 if not valid.
+ * 1 if valid.
+ *
+ */
+{
+ int n;
+
+ /* For now only use the TekHVC numbers as inputs */
+ if (pColor->format != XcmsTekHVCFormat) {
+ return(0);
+ }
+
+ if (pColor->spec.TekHVC.V < 0.0) {
+ pColor->spec.TekHVC.V = 0.0 + XMY_DBL_EPSILON;
+ } else if (pColor->spec.TekHVC.V > 100.0) {
+ pColor->spec.TekHVC.V = 100.0 - XMY_DBL_EPSILON;
+ }
+
+ if (pColor->spec.TekHVC.C < 0.0) {
+ pColor->spec.TekHVC.C = 0.0 - XMY_DBL_EPSILON;
+ }
+
+ if (pColor->spec.TekHVC.H < 0.0) {
+ n = -pColor->spec.TekHVC.H / 360.0;
+ pColor->spec.TekHVC.H += (n + 1) * 360.0;
+ if (pColor->spec.TekHVC.H >= 360.0)
+ pColor->spec.TekHVC.H -= 360.0;
+ } else if (pColor->spec.TekHVC.H >= 360.0) {
+ n = pColor->spec.TekHVC.H / 360.0;
+ pColor->spec.TekHVC.H -= n * 360.0;
+ }
+ return(1);
+}
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