diff options
Diffstat (limited to 'libX11/src/xcms/uvY.c')
| -rw-r--r-- | libX11/src/xcms/uvY.c | 846 |
1 files changed, 423 insertions, 423 deletions
diff --git a/libX11/src/xcms/uvY.c b/libX11/src/xcms/uvY.c index a4abc66cd..5344fb17c 100644 --- a/libX11/src/xcms/uvY.c +++ b/libX11/src/xcms/uvY.c @@ -1,423 +1,423 @@ -
-/*
- * 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
- * CIEuvy.c
- *
- * DESCRIPTION
- * This file contains routines that support the CIE u'v'Y
- * 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 <X11/Xos.h>
-#include "Xlibint.h"
-#include "Xcmsint.h"
-#include "Cv.h"
-
-#include <stdio.h>
-
-/*
- * FORWARD DECLARATIONS
- */
-static int CIEuvY_ParseString(register char *spec, XcmsColor *pColor);
-
-/*
- * DEFINES
- * Internal definitions that need NOT be exported to any package
- * or program using this package.
- */
-#ifdef DBL_EPSILON
-# define XMY_DBL_EPSILON DBL_EPSILON
-#else
-# define XMY_DBL_EPSILON 0.00001
-#endif
-
-
-/*
- * LOCAL VARIABLES
- */
-
- /*
- * NULL terminated list of functions applied to get from CIEuvY to CIEXYZ
- */
-static XcmsConversionProc Fl_CIEuvY_to_CIEXYZ[] = {
- XcmsCIEuvYToCIEXYZ,
- NULL
-};
-
- /*
- * NULL terminated list of functions applied to get from CIEXYZ to CIEuvY
- */
-static XcmsConversionProc Fl_CIEXYZ_to_CIEuvY[] = {
- XcmsCIEXYZToCIEuvY,
- NULL
-};
-
-
-/*
- * GLOBALS
- */
-
- /*
- * CIE uvY Color Space
- */
-XcmsColorSpace XcmsCIEuvYColorSpace =
- {
- _XcmsCIEuvY_prefix, /* prefix */
- XcmsCIEuvYFormat, /* id */
- CIEuvY_ParseString, /* parseString */
- Fl_CIEuvY_to_CIEXYZ, /* to_CIEXYZ */
- Fl_CIEXYZ_to_CIEuvY, /* from_CIEXYZ */
- 1
- };
-
-
-
-/************************************************************************
- * *
- * PRIVATE ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * CIEuvY_ParseString
- *
- * SYNOPSIS
- */
-static int
-CIEuvY_ParseString(
- register char *spec,
- XcmsColor *pColor)
-/*
- * DESCRIPTION
- * This routines takes a string and attempts to convert
- * it into a XcmsColor structure with XcmsCIEuvYFormat.
- * The assumed CIEuvY string syntax is:
- * CIEuvY:<u>/<v>/<Y>
- * Where u, v, 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, _XcmsCIEuvY_prefix, n) != 0) {
- return(XcmsFailure);
- }
-
- /*
- * Attempt to parse the value portion.
- */
- if (sscanf(spec + n + 1, "%lf/%lf/%lf",
- &pColor->spec.CIEuvY.u_prime,
- &pColor->spec.CIEuvY.v_prime,
- &pColor->spec.CIEuvY.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.CIEuvY.u_prime,
- &pColor->spec.CIEuvY.v_prime,
- &pColor->spec.CIEuvY.Y) != 3) {
- free(s);
- return(XcmsFailure);
- }
- free(s);
- } else
- return(XcmsFailure);
- }
- pColor->format = XcmsCIEuvYFormat;
- pColor->pixel = 0;
- return(_XcmsCIEuvY_ValidSpec(pColor));
-}
-
-
-/************************************************************************
- * *
- * PUBLIC ROUTINES *
- * *
- ************************************************************************/
-
-/*
- * NAME
- * XcmsCIEuvY_ValidSpec
- *
- * SYNOPSIS
- */
-Status
-_XcmsCIEuvY_ValidSpec(
- XcmsColor *pColor)
-/*
- * DESCRIPTION
- * Checks if color specification valid for CIE u'v'Y.
- *
- * RETURNS
- * XcmsFailure if invalid,
- * XcmsSuccess if valid.
- *
- */
-{
- if (pColor->format != XcmsCIEuvYFormat
- ||
- (pColor->spec.CIEuvY.Y < 0.0 - XMY_DBL_EPSILON)
- ||
- (pColor->spec.CIEuvY.Y > 1.0 + XMY_DBL_EPSILON)) {
- return(XcmsFailure);
- }
- return(XcmsSuccess);
-}
-
-
-/*
- * NAME
- * XcmsCIEuvYToCIEXYZ - convert CIEuvY to CIEXYZ
- *
- * SYNOPSIS
- */
-Status
-XcmsCIEuvYToCIEXYZ(
- XcmsCCC ccc,
- XcmsColor *puvY_WhitePt,
- XcmsColor *pColors_in_out,
- unsigned int nColors)
-/*
- * DESCRIPTION
- * Converts color specifications in an array of XcmsColor
- * structures from CIEuvY format to CIEXYZ format.
- *
- * RETURNS
- * XcmsFailure if failed,
- * XcmsSuccess if succeeded.
- *
- */
-{
- XcmsCIEXYZ XYZ_return;
- XcmsColor whitePt;
- int i;
- XcmsColor *pColor = pColors_in_out;
- XcmsFloat div, x, y, z, Y;
-
- /*
- * Check arguments
- * Postpone checking puvY_WhitePt until it is actually needed
- * otherwise converting between XYZ and uvY will fail.
- */
- if (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 CIEuvY */
- if (!_XcmsCIEuvY_ValidSpec(pColor)) {
- return(XcmsFailure);
- }
-
- /*
- * Convert to CIEXYZ
- */
-
- Y = pColor->spec.CIEuvY.Y;
-
- /* Convert color u'v' to xyz space */
- div = (6.0 * pColor->spec.CIEuvY.u_prime) - (16.0 * pColor->spec.CIEuvY.v_prime) + 12.0;
- if (div == 0.0) {
- /* use white point since div == 0 */
- if (puvY_WhitePt == NULL ) {
- return(XcmsFailure);
- }
- /*
- * Make sure white point is in CIEuvY form
- */
- if (puvY_WhitePt->format != XcmsCIEuvYFormat) {
- /* Make copy of the white point because we're going to modify it */
- memcpy((char *)&whitePt, (char *)puvY_WhitePt, sizeof(XcmsColor));
- if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1,
- XcmsCIEuvYFormat)) {
- return(XcmsFailure);
- }
- puvY_WhitePt = &whitePt;
- }
- /* Make sure it is a white point, i.e., Y == 1.0 */
- if (puvY_WhitePt->spec.CIEuvY.Y != 1.0) {
- return(XcmsFailure);
- }
- div = (6.0 * puvY_WhitePt->spec.CIEuvY.u_prime) -
- (16.0 * puvY_WhitePt->spec.CIEuvY.v_prime) + 12.0;
- if (div == 0) {
- /* internal error */
- return(XcmsFailure);
- }
- x = 9.0 * puvY_WhitePt->spec.CIEuvY.u_prime / div;
- y = 4.0 * puvY_WhitePt->spec.CIEuvY.v_prime / div;
- } else {
- x = 9.0 * pColor->spec.CIEuvY.u_prime / div;
- y = 4.0 * pColor->spec.CIEuvY.v_prime / div;
- }
- z = 1.0 - x - y;
-
- /* Convert from xyz to XYZ */
- /* Conversion uses color normalized lightness based on Y */
- if (y != 0.0) {
- XYZ_return.X = x * Y / y;
- } else {
- XYZ_return.X = x;
- }
- XYZ_return.Y = Y;
- if (y != 0.0) {
- XYZ_return.Z = z * Y / y;
- } else {
- XYZ_return.Z = z;
- }
-
- memcpy((char *)&pColor->spec.CIEXYZ, (char *)&XYZ_return, sizeof(XcmsCIEXYZ));
- /* Identify that format is now CIEXYZ */
- pColor->format = XcmsCIEXYZFormat;
- }
-
- return(XcmsSuccess);
-}
-
-
-/*
- * NAME
- * XcmsCIEXYZToCIEuvY - convert CIEXYZ to CIEuvY
- *
- * SYNOPSIS
- */
-Status
-XcmsCIEXYZToCIEuvY(
- XcmsCCC ccc,
- XcmsColor *puvY_WhitePt,
- XcmsColor *pColors_in_out,
- unsigned int nColors)
-/*
- * DESCRIPTION
- * Converts color specifications in an array of XcmsColor
- * structures from CIEXYZ format to CIEuvY format.
- *
- * RETURNS
- * XcmsFailure if failed,
- * XcmsSuccess if succeeded.
- *
- */
-{
- XcmsCIEuvY uvY_return;
- XcmsColor whitePt;
- int i;
- XcmsColor *pColor = pColors_in_out;
- XcmsFloat div;
-
- /*
- * Check arguments
- * Postpone checking puvY_WhitePt until it is actually needed
- * otherwise converting between XYZ and uvY will fail.
- */
- if (pColors_in_out == NULL) {
- return(XcmsFailure);
- }
-
- /*
- * Now convert each XcmsColor structure to CIEuvY form
- */
- for (i = 0; i < nColors; i++, pColor++) {
-
- /* Make sure original format is CIEXYZ */
- if (!_XcmsCIEXYZ_ValidSpec(pColor)) {
- return(XcmsFailure);
- }
-
- /* Convert to CIEuvY */
- div = pColor->spec.CIEXYZ.X + (15.0 * pColor->spec.CIEXYZ.Y) +
- (3.0 * pColor->spec.CIEXYZ.Z);
- if (div == 0.0) {
- /* Use white point since div == 0.0 */
- if (puvY_WhitePt == NULL ) {
- return(XcmsFailure);
- }
- /*
- * Make sure white point is in CIEuvY form
- */
- if (puvY_WhitePt->format != XcmsCIEuvYFormat) {
- /* Make copy of the white point because we're going to modify it */
- memcpy((char *)&whitePt, (char *)puvY_WhitePt, sizeof(XcmsColor));
- if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1,
- XcmsCIEuvYFormat)) {
- return(XcmsFailure);
- }
- puvY_WhitePt = &whitePt;
- }
- /* Make sure it is a white point, i.e., Y == 1.0 */
- if (puvY_WhitePt->spec.CIEuvY.Y != 1.0) {
- return(XcmsFailure);
- }
- uvY_return.Y = pColor->spec.CIEXYZ.Y;
- uvY_return.u_prime = puvY_WhitePt->spec.CIEuvY.u_prime;
- uvY_return.v_prime = puvY_WhitePt->spec.CIEuvY.v_prime;
- } else {
- uvY_return.u_prime = 4.0 * pColor->spec.CIEXYZ.X / div;
- uvY_return.v_prime = 9.0 * pColor->spec.CIEXYZ.Y / div;
- uvY_return.Y = pColor->spec.CIEXYZ.Y;
- }
-
- memcpy((char *)&pColor->spec.CIEuvY, (char *)&uvY_return, sizeof(XcmsCIEuvY));
- /* Identify that format is now CIEuvY */
- pColor->format = XcmsCIEuvYFormat;
- }
-
- return(XcmsSuccess);
-}
+ +/* + * 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 + * CIEuvy.c + * + * DESCRIPTION + * This file contains routines that support the CIE u'v'Y + * 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 <X11/Xos.h> +#include "Xlibint.h" +#include "Xcmsint.h" +#include "Cv.h" + +#include <stdio.h> + +/* + * FORWARD DECLARATIONS + */ +static int CIEuvY_ParseString(register char *spec, XcmsColor *pColor); + +/* + * DEFINES + * Internal definitions that need NOT be exported to any package + * or program using this package. + */ +#ifdef DBL_EPSILON +# define XMY_DBL_EPSILON DBL_EPSILON +#else +# define XMY_DBL_EPSILON 0.00001 +#endif + + +/* + * LOCAL VARIABLES + */ + + /* + * NULL terminated list of functions applied to get from CIEuvY to CIEXYZ + */ +static XcmsConversionProc Fl_CIEuvY_to_CIEXYZ[] = { + XcmsCIEuvYToCIEXYZ, + NULL +}; + + /* + * NULL terminated list of functions applied to get from CIEXYZ to CIEuvY + */ +static XcmsConversionProc Fl_CIEXYZ_to_CIEuvY[] = { + XcmsCIEXYZToCIEuvY, + NULL +}; + + +/* + * GLOBALS + */ + + /* + * CIE uvY Color Space + */ +XcmsColorSpace XcmsCIEuvYColorSpace = + { + _XcmsCIEuvY_prefix, /* prefix */ + XcmsCIEuvYFormat, /* id */ + CIEuvY_ParseString, /* parseString */ + Fl_CIEuvY_to_CIEXYZ, /* to_CIEXYZ */ + Fl_CIEXYZ_to_CIEuvY, /* from_CIEXYZ */ + 1 + }; + + + +/************************************************************************ + * * + * PRIVATE ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * CIEuvY_ParseString + * + * SYNOPSIS + */ +static int +CIEuvY_ParseString( + register char *spec, + XcmsColor *pColor) +/* + * DESCRIPTION + * This routines takes a string and attempts to convert + * it into a XcmsColor structure with XcmsCIEuvYFormat. + * The assumed CIEuvY string syntax is: + * CIEuvY:<u>/<v>/<Y> + * Where u, v, 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, _XcmsCIEuvY_prefix, n) != 0) { + return(XcmsFailure); + } + + /* + * Attempt to parse the value portion. + */ + if (sscanf(spec + n + 1, "%lf/%lf/%lf", + &pColor->spec.CIEuvY.u_prime, + &pColor->spec.CIEuvY.v_prime, + &pColor->spec.CIEuvY.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.CIEuvY.u_prime, + &pColor->spec.CIEuvY.v_prime, + &pColor->spec.CIEuvY.Y) != 3) { + free(s); + return(XcmsFailure); + } + free(s); + } else + return(XcmsFailure); + } + pColor->format = XcmsCIEuvYFormat; + pColor->pixel = 0; + return(_XcmsCIEuvY_ValidSpec(pColor)); +} + + +/************************************************************************ + * * + * PUBLIC ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * XcmsCIEuvY_ValidSpec + * + * SYNOPSIS + */ +Status +_XcmsCIEuvY_ValidSpec( + XcmsColor *pColor) +/* + * DESCRIPTION + * Checks if color specification valid for CIE u'v'Y. + * + * RETURNS + * XcmsFailure if invalid, + * XcmsSuccess if valid. + * + */ +{ + if (pColor->format != XcmsCIEuvYFormat + || + (pColor->spec.CIEuvY.Y < 0.0 - XMY_DBL_EPSILON) + || + (pColor->spec.CIEuvY.Y > 1.0 + XMY_DBL_EPSILON)) { + return(XcmsFailure); + } + return(XcmsSuccess); +} + + +/* + * NAME + * XcmsCIEuvYToCIEXYZ - convert CIEuvY to CIEXYZ + * + * SYNOPSIS + */ +Status +XcmsCIEuvYToCIEXYZ( + XcmsCCC ccc, + XcmsColor *puvY_WhitePt, + XcmsColor *pColors_in_out, + unsigned int nColors) +/* + * DESCRIPTION + * Converts color specifications in an array of XcmsColor + * structures from CIEuvY format to CIEXYZ format. + * + * RETURNS + * XcmsFailure if failed, + * XcmsSuccess if succeeded. + * + */ +{ + XcmsCIEXYZ XYZ_return; + XcmsColor whitePt; + int i; + XcmsColor *pColor = pColors_in_out; + XcmsFloat div, x, y, z, Y; + + /* + * Check arguments + * Postpone checking puvY_WhitePt until it is actually needed + * otherwise converting between XYZ and uvY will fail. + */ + if (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 CIEuvY */ + if (!_XcmsCIEuvY_ValidSpec(pColor)) { + return(XcmsFailure); + } + + /* + * Convert to CIEXYZ + */ + + Y = pColor->spec.CIEuvY.Y; + + /* Convert color u'v' to xyz space */ + div = (6.0 * pColor->spec.CIEuvY.u_prime) - (16.0 * pColor->spec.CIEuvY.v_prime) + 12.0; + if (div == 0.0) { + /* use white point since div == 0 */ + if (puvY_WhitePt == NULL ) { + return(XcmsFailure); + } + /* + * Make sure white point is in CIEuvY form + */ + if (puvY_WhitePt->format != XcmsCIEuvYFormat) { + /* Make copy of the white point because we're going to modify it */ + memcpy((char *)&whitePt, (char *)puvY_WhitePt, sizeof(XcmsColor)); + if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1, + XcmsCIEuvYFormat)) { + return(XcmsFailure); + } + puvY_WhitePt = &whitePt; + } + /* Make sure it is a white point, i.e., Y == 1.0 */ + if (puvY_WhitePt->spec.CIEuvY.Y != 1.0) { + return(XcmsFailure); + } + div = (6.0 * puvY_WhitePt->spec.CIEuvY.u_prime) - + (16.0 * puvY_WhitePt->spec.CIEuvY.v_prime) + 12.0; + if (div == 0) { + /* internal error */ + return(XcmsFailure); + } + x = 9.0 * puvY_WhitePt->spec.CIEuvY.u_prime / div; + y = 4.0 * puvY_WhitePt->spec.CIEuvY.v_prime / div; + } else { + x = 9.0 * pColor->spec.CIEuvY.u_prime / div; + y = 4.0 * pColor->spec.CIEuvY.v_prime / div; + } + z = 1.0 - x - y; + + /* Convert from xyz to XYZ */ + /* Conversion uses color normalized lightness based on Y */ + if (y != 0.0) { + XYZ_return.X = x * Y / y; + } else { + XYZ_return.X = x; + } + XYZ_return.Y = Y; + if (y != 0.0) { + XYZ_return.Z = z * Y / y; + } else { + XYZ_return.Z = z; + } + + memcpy((char *)&pColor->spec.CIEXYZ, (char *)&XYZ_return, sizeof(XcmsCIEXYZ)); + /* Identify that format is now CIEXYZ */ + pColor->format = XcmsCIEXYZFormat; + } + + return(XcmsSuccess); +} + + +/* + * NAME + * XcmsCIEXYZToCIEuvY - convert CIEXYZ to CIEuvY + * + * SYNOPSIS + */ +Status +XcmsCIEXYZToCIEuvY( + XcmsCCC ccc, + XcmsColor *puvY_WhitePt, + XcmsColor *pColors_in_out, + unsigned int nColors) +/* + * DESCRIPTION + * Converts color specifications in an array of XcmsColor + * structures from CIEXYZ format to CIEuvY format. + * + * RETURNS + * XcmsFailure if failed, + * XcmsSuccess if succeeded. + * + */ +{ + XcmsCIEuvY uvY_return; + XcmsColor whitePt; + int i; + XcmsColor *pColor = pColors_in_out; + XcmsFloat div; + + /* + * Check arguments + * Postpone checking puvY_WhitePt until it is actually needed + * otherwise converting between XYZ and uvY will fail. + */ + if (pColors_in_out == NULL) { + return(XcmsFailure); + } + + /* + * Now convert each XcmsColor structure to CIEuvY form + */ + for (i = 0; i < nColors; i++, pColor++) { + + /* Make sure original format is CIEXYZ */ + if (!_XcmsCIEXYZ_ValidSpec(pColor)) { + return(XcmsFailure); + } + + /* Convert to CIEuvY */ + div = pColor->spec.CIEXYZ.X + (15.0 * pColor->spec.CIEXYZ.Y) + + (3.0 * pColor->spec.CIEXYZ.Z); + if (div == 0.0) { + /* Use white point since div == 0.0 */ + if (puvY_WhitePt == NULL ) { + return(XcmsFailure); + } + /* + * Make sure white point is in CIEuvY form + */ + if (puvY_WhitePt->format != XcmsCIEuvYFormat) { + /* Make copy of the white point because we're going to modify it */ + memcpy((char *)&whitePt, (char *)puvY_WhitePt, sizeof(XcmsColor)); + if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1, + XcmsCIEuvYFormat)) { + return(XcmsFailure); + } + puvY_WhitePt = &whitePt; + } + /* Make sure it is a white point, i.e., Y == 1.0 */ + if (puvY_WhitePt->spec.CIEuvY.Y != 1.0) { + return(XcmsFailure); + } + uvY_return.Y = pColor->spec.CIEXYZ.Y; + uvY_return.u_prime = puvY_WhitePt->spec.CIEuvY.u_prime; + uvY_return.v_prime = puvY_WhitePt->spec.CIEuvY.v_prime; + } else { + uvY_return.u_prime = 4.0 * pColor->spec.CIEXYZ.X / div; + uvY_return.v_prime = 9.0 * pColor->spec.CIEXYZ.Y / div; + uvY_return.Y = pColor->spec.CIEXYZ.Y; + } + + memcpy((char *)&pColor->spec.CIEuvY, (char *)&uvY_return, sizeof(XcmsCIEuvY)); + /* Identify that format is now CIEuvY */ + pColor->format = XcmsCIEuvYFormat; + } + + return(XcmsSuccess); +} |