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/* $Xorg: XYZ.c,v 1.3 2000/08/17 19:45:04 cpqbld Exp $ */
/*
* 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
* CIEXYZ.c
*
* DESCRIPTION
* CIE XYZ Color Space
*
*
*/
/* $XFree86$ */
#include <X11/Xos.h>
#include "Xlibint.h"
#include "Xcmsint.h"
#include "Cv.h"
#include <stdio.h> /* sscanf */
/*
* 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
/*
* FORWARD DECLARATIONS
*/
static int CIEXYZ_ParseString(register char *spec, XcmsColor *pColor);
/*
* LOCALS VARIABLES
*/
static XcmsConversionProc Fl_CIEXYZ_to_CIEXYZ[] = {
NULL
};
/*
* GLOBALS
* Variables declared in this package that are allowed
* to be used globally.
*/
/*
* CIE XYZ Color Space
*/
XcmsColorSpace XcmsCIEXYZColorSpace =
{
_XcmsCIEXYZ_prefix, /* prefix */
XcmsCIEXYZFormat, /* id */
CIEXYZ_ParseString, /* parseString */
Fl_CIEXYZ_to_CIEXYZ, /* to_CIEXYZ */
Fl_CIEXYZ_to_CIEXYZ, /* from_CIEXYZ */
1
};
/************************************************************************
* *
* PRIVATE ROUTINES *
* *
************************************************************************/
/*
* NAME
* CIEXYZ_ParseString
*
* SYNOPSIS
*/
static int
CIEXYZ_ParseString(
register char *spec,
XcmsColor *pColor)
/*
* DESCRIPTION
* This routines takes a string and attempts to convert
* it into a XcmsColor structure with XcmsCIEXYZFormat.
* The assumed CIEXYZ string syntax is:
* CIEXYZ:<X>/<Y>/<Z>
* Where X, Y, and Z 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
*/
{
int n;
char *pchar;
if ((pchar = strchr(spec, ':')) == NULL) {
return(XcmsFailure);
}
n = (int)(pchar - spec);
/*
* Check for proper prefix.
*/
if (strncmp(spec, _XcmsCIEXYZ_prefix, n) != 0) {
return(XcmsFailure);
}
/*
* Attempt to parse the value portion.
*/
if (sscanf(spec + n + 1, "%lf/%lf/%lf",
&pColor->spec.CIEXYZ.X,
&pColor->spec.CIEXYZ.Y,
&pColor->spec.CIEXYZ.Z) != 3) {
return(XcmsFailure);
}
pColor->format = XcmsCIEXYZFormat;
pColor->pixel = 0;
return(_XcmsCIEXYZ_ValidSpec(pColor));
}
/************************************************************************
* *
* PUBLIC ROUTINES *
* *
************************************************************************/
/*
* NAME
* XcmsCIELab_ValidSpec
*
* SYNOPSIS
*/
Status
_XcmsCIEXYZ_ValidSpec(
XcmsColor *pColor)
/*
* DESCRIPTION
* Checks if color specification valid for CIE XYZ
*
* RETURNS
* XcmsFailure if invalid,
* XcmsSuccess if valid.
*
*/
{
if (pColor->format != XcmsCIEXYZFormat
||
(pColor->spec.CIEXYZ.Y < 0.0 - XMY_DBL_EPSILON)
||
(pColor->spec.CIEXYZ.Y > 1.0 + XMY_DBL_EPSILON)) {
return(XcmsFailure);
}
return(XcmsSuccess);
}
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