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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
- * CIExyY.c
- *
- * DESCRIPTION
- * This file contains routines that support the CIE xyY
- * 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 <stdio.h>
-#include <nx-X11/Xos.h>
-#include "Xlibint.h"
-#include "Xcmsint.h"
-#include "Cv.h"
-
-/*
- * DEFINES
- */
-#define EPS 0.00001 /* some extremely small number */
-#ifdef DBL_EPSILON
-# define XMY_DBL_EPSILON DBL_EPSILON
-#else
-# define XMY_DBL_EPSILON 0.00001
-#endif
-
-/*
- * FORWARD DECLARATIONS
- */
-
-static int CIExyY_ParseString(register char *spec, XcmsColor *pColor);
-static Status XcmsCIExyY_ValidSpec(XcmsColor *pColor);
-
-
-/*
- * LOCAL VARIABLES
- */
-
- /*
- * NULL terminated list of functions applied to get from CIExyY to CIEXYZ
- */
-static XcmsConversionProc Fl_CIExyY_to_CIEXYZ[] = {
- XcmsCIExyYToCIEXYZ,
- NULL
-};
-
- /*
- * NULL terminated list of functions applied to get from CIEXYZ to CIExyY
- */
-static XcmsConversionProc Fl_CIEXYZ_to_CIExyY[] = {
- XcmsCIEXYZToCIExyY,
- NULL
-};
-
-
-/*
- * GLOBALS
- */
-
- /*
- * CIE xyY Color Space
- */
-XcmsColorSpace XcmsCIExyYColorSpace =
- {
- _XcmsCIExyY_prefix, /* prefix */
- XcmsCIExyYFormat, /* id */
- CIExyY_ParseString, /* parseString */
- Fl_CIExyY_to_CIEXYZ, /* to_CIEXYZ */
- Fl_CIEXYZ_to_CIExyY, /* from_CIEXYZ */
- 1
- };
-
-
-
-/************************************************************************
- * *
- * PRIVATE ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * CIExyY_ParseString
- *
- * SYNOPSIS
- */
-static int
-CIExyY_ParseString(
- register char *spec,
- XcmsColor *pColor)
-/*
- * DESCRIPTION
- * This routines takes a string and attempts to convert
- * it into a XcmsColor structure with XcmsCIExyYFormat.
- * The assumed CIExyY string syntax is:
- * CIExyY:<x>/<y>/<Y>
- * Where x, y, and Y 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
- * 0 if failed, non-zero otherwise.
- */
-{
- int n;
- char *pchar;
-
- if ((pchar = strchr(spec, ':')) == NULL) {
- return(XcmsFailure);
- }
- n = (int)(pchar - spec);
-
- /*
- * Check for proper prefix.
- */
- if (strncmp(spec, _XcmsCIExyY_prefix, n) != 0) {
- return(XcmsFailure);
- }
-
- /*
- * Attempt to parse the value portion.
- */
- if (sscanf(spec + n + 1, "%lf/%lf/%lf",
- &pColor->spec.CIExyY.x,
- &pColor->spec.CIExyY.y,
- &pColor->spec.CIExyY.Y) != 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.CIExyY.x,
- &pColor->spec.CIExyY.y,
- &pColor->spec.CIExyY.Y) != 3) {
- free(s);
- return(XcmsFailure);
- }
- free(s);
- } else
- return(XcmsFailure);
- }
- pColor->format = XcmsCIExyYFormat;
- pColor->pixel = 0;
- return(XcmsCIExyY_ValidSpec(pColor));
-}
-
-
-
-/************************************************************************
- * *
- * PUBLIC ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * CIExyY_ValidSpec()
- *
- * SYNOPSIS
- */
-static Status
-XcmsCIExyY_ValidSpec(
- XcmsColor *pColor)
-/*
- * DESCRIPTION
- * Checks a valid CIExyY color specification.
- *
- * RETURNS
- * XcmsFailure if invalid.
- * XcmsSuccess if valid.
- *
- */
-{
- if (pColor->format != XcmsCIExyYFormat
- ||
- (pColor->spec.CIExyY.x < 0.0 - XMY_DBL_EPSILON)
- ||
- (pColor->spec.CIExyY.x > 1.0 + XMY_DBL_EPSILON)
- ||
- (pColor->spec.CIExyY.y < 0.0 - XMY_DBL_EPSILON)
- ||
- (pColor->spec.CIExyY.y > 1.0 + XMY_DBL_EPSILON)
- ||
- (pColor->spec.CIExyY.Y < 0.0 - XMY_DBL_EPSILON)
- ||
- (pColor->spec.CIExyY.Y > 1.0 + XMY_DBL_EPSILON)) {
- return(XcmsFailure);
- }
- return(XcmsSuccess);
-}
-
-
-/*
- * NAME
- * XcmsCIExyYToCIEXYZ - convert CIExyY to CIEXYZ
- *
- * SYNOPSIS
- */
-Status
-XcmsCIExyYToCIEXYZ(
- XcmsCCC ccc,
- XcmsColor *pxyY_WhitePt,
- XcmsColor *pColors_in_out,
- unsigned int nColors)
-/*
- * DESCRIPTION
- * Converts color specifications in an array of XcmsColor
- * structures from CIExyY format to CIEXYZ format.
- *
- * RETURNS
- * XcmsFailure if failed,
- * XcmsSuccess if succeeded.
- */
-{
- XcmsColor *pColor = pColors_in_out;
- XcmsColor whitePt;
- XcmsCIEXYZ XYZ_return;
- XcmsFloat div; /* temporary storage in case divisor is zero */
- XcmsFloat u, v, x, y, z; /* temporary storage */
- unsigned int i;
-
- /*
- * Check arguments
- */
- if (pxyY_WhitePt == NULL || pColors_in_out == NULL) {
- return(XcmsFailure);
- }
-
-
- /*
- * Now convert each XcmsColor structure to CIEXYZ form
- */
- for (i = 0; i < nColors; i++, pColor++) {
- /* Make sure original format is CIExyY and valid */
- if (!XcmsCIExyY_ValidSpec(pColor)) {
- return(XcmsFailure);
- }
-
- if ((div = (-2 * pColor->spec.CIExyY.x) + (12 * pColor->spec.CIExyY.y) + 3) == 0.0) {
- /* Note that the divisor is zero */
- /* This return is abitrary. */
- XYZ_return.X = 0;
- XYZ_return.Y = 0;
- XYZ_return.Z = 0;
- } else {
- /*
- * Make sure white point is in CIEXYZ form
- */
- if (pxyY_WhitePt->format != XcmsCIEXYZFormat) {
- /* Make copy of the white point because we're going to modify it */
- memcpy((char *)&whitePt, (char *)pxyY_WhitePt, sizeof(XcmsColor));
- if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1,
- XcmsCIEXYZFormat)) {
- return(XcmsFailure);
- }
- pxyY_WhitePt = &whitePt;
- }
-
- /* Make sure it is a white point, i.e., Y == 1.0 */
- if (pxyY_WhitePt->spec.CIEXYZ.Y != 1.0) {
- return(XcmsFailure);
- }
-
- /* Convert from xyY to uvY to XYZ */
- u = (4 * pColor->spec.CIExyY.x) / div;
- v = (9 * pColor->spec.CIExyY.y) / div;
- div = (6.0 * u) - (16.0 * v) + 12.0;
- if (div == 0.0) {
- /* Note that the divisor is zero */
- /* This return is abitrary. */
- if ((div = (6.0 * whitePt.spec.CIEuvY.u_prime) -
- (16.0 * whitePt.spec.CIEuvY.v_prime) + 12.0) == 0.0) {
- div = EPS;
- }
- x = 9.0 * whitePt.spec.CIEuvY.u_prime / div;
- y = 4.0 * whitePt.spec.CIEuvY.u_prime / div;
- } else {
- /* convert u, v to small xyz */
- x = 9.0 * u / div;
- y = 4.0 * v / div;
- }
- z = 1.0 - x - y;
- if (y == 0.0) y = EPS; /* Have to worry about divide by 0 */
- XYZ_return.Y = pColor->spec.CIExyY.Y;
- XYZ_return.X = x * XYZ_return.Y / y;
- XYZ_return.Z = z * XYZ_return.Y / y;
- }
-
- /* Copy result to pColor */
- memcpy ((char *)&pColor->spec, (char *)&XYZ_return, sizeof(XcmsCIEXYZ));
-
- /* Identify that the format is now CIEXYZ */
- pColor->format = XcmsCIEXYZFormat;
- }
- return(XcmsSuccess);
-}
-
-
-/*
- * NAME
- * XcmsCIEXYZToCIExyY - convert CIEXYZ to CIExyY
- *
- * SYNOPSIS
- */
-/* ARGSUSED */
-Status
-XcmsCIEXYZToCIExyY(
- XcmsCCC ccc,
- XcmsColor *pxyY_WhitePt,
- XcmsColor *pColors_in_out,
- unsigned int nColors)
-/*
- * DESCRIPTION
- * Converts color specifications in an array of XcmsColor
- * structures from CIEXYZ format to CIExyY format.
- *
- * RETURNS
- * XcmsFailure if failed,
- * XcmsSuccess if succeeded.
- *
- */
-{
- XcmsColor *pColor = pColors_in_out;
- XcmsCIExyY xyY_return;
- XcmsFloat div; /* temporary storage in case divisor is zero */
- unsigned int i;
-
- /*
- * Check arguments
- * pxyY_WhitePt ignored
- */
- if (pColors_in_out == NULL) {
- return(XcmsFailure);
- }
-
- /*
- * Now convert each XcmsColor structure to CIEXYZ form
- */
- for (i = 0; i < nColors; i++, pColor++) {
-
- if (!_XcmsCIEXYZ_ValidSpec(pColor)) {
- return(XcmsFailure);
- }
- /* Now convert for XYZ to xyY */
- if ((div = pColor->spec.CIEXYZ.X + pColor->spec.CIEXYZ.Y + pColor->spec.CIEXYZ.Z) == 0.0) {
- div = EPS;
- }
- xyY_return.x = pColor->spec.CIEXYZ.X / div;
- xyY_return.y = pColor->spec.CIEXYZ.Y / div;
- xyY_return.Y = pColor->spec.CIEXYZ.Y;
-
- /* Copy result to pColor */
- memcpy ((char *)&pColor->spec, (char *)&xyY_return, sizeof(XcmsCIExyY));
-
- /* Identify that the format is now CIEXYZ */
- pColor->format = XcmsCIExyYFormat;
- }
- return(XcmsSuccess);
-}
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