1
2/*
3 * Code and supporting documentation (c) Copyright 1990 1991 Tektronix, Inc.
4 * 	All Rights Reserved
5 *
6 * This file is a component of an X Window System-specific implementation
7 * of XCMS based on the TekColor Color Management System.  Permission is
8 * hereby granted to use, copy, modify, sell, and otherwise distribute this
9 * software and its documentation for any purpose and without fee, provided
10 * that this copyright, permission, and disclaimer notice is reproduced in
11 * all copies of this software and in supporting documentation.  TekColor
12 * is a trademark of Tektronix, Inc.
13 *
14 * Tektronix makes no representation about the suitability of this software
15 * for any purpose.  It is provided "as is" and with all faults.
16 *
17 * TEKTRONIX DISCLAIMS ALL WARRANTIES APPLICABLE TO THIS SOFTWARE,
18 * INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
19 * PARTICULAR PURPOSE.  IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR ANY
20 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
21 * RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF
22 * CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
23 * CONNECTION WITH THE USE OR THE PERFORMANCE OF THIS SOFTWARE.
24 *
25 *
26 *
27 *	NAME
28 *		CIEXYZ.c
29 *
30 *	DESCRIPTION
31 *		CIE XYZ Color Space
32 *
33 *
34 */
35
36#ifdef HAVE_CONFIG_H
37#include <config.h>
38#endif
39#include <X11/Xos.h>
40#include "Xlibint.h"
41#include "Xcmsint.h"
42#include "Cv.h"
43
44#include <stdio.h> /* sscanf */
45
46/*
47 *	DEFINES
48 *		Internal definitions that need NOT be exported to any package
49 *		or program using this package.
50 */
51#ifdef DBL_EPSILON
52#  define XMY_DBL_EPSILON DBL_EPSILON
53#else
54#  define XMY_DBL_EPSILON 0.00001
55#endif
56
57/*
58 *      FORWARD DECLARATIONS
59 */
60static int CIEXYZ_ParseString(register char *spec, XcmsColor *pColor);
61
62/*
63 *      LOCALS VARIABLES
64 */
65
66static XcmsConversionProc Fl_CIEXYZ_to_CIEXYZ[] = {
67    NULL
68};
69
70
71
72/*
73 *      GLOBALS
74 *              Variables declared in this package that are allowed
75 *		to be used globally.
76 */
77    /*
78     * CIE XYZ Color Space
79     */
80XcmsColorSpace	XcmsCIEXYZColorSpace =
81    {
82	_XcmsCIEXYZ_prefix,		/* prefix */
83	XcmsCIEXYZFormat,		/* id */
84	CIEXYZ_ParseString,	/* parseString */
85	Fl_CIEXYZ_to_CIEXYZ,	/* to_CIEXYZ */
86	Fl_CIEXYZ_to_CIEXYZ,	/* from_CIEXYZ */
87	1
88    };
89
90
91/************************************************************************
92 *									*
93 *			PRIVATE ROUTINES				*
94 *									*
95 ************************************************************************/
96
97/*
98 *	NAME
99 *		CIEXYZ_ParseString
100 *
101 *	SYNOPSIS
102 */
103static int
104CIEXYZ_ParseString(
105    register char *spec,
106    XcmsColor *pColor)
107/*
108 *	DESCRIPTION
109 *		This routines takes a string and attempts to convert
110 *		it into a XcmsColor structure with XcmsCIEXYZFormat.
111 *		The assumed CIEXYZ string syntax is:
112 *		    CIEXYZ:<X>/<Y>/<Z>
113 *		Where X, Y, and Z are in string input format for floats
114 *		consisting of:
115 *		    a. an optional sign
116 *		    b. a string of numbers possibly containing a decimal point,
117 *		    c. an optional exponent field containing an 'E' or 'e'
118 *			followed by a possibly signed integer string.
119 *
120 *	RETURNS
121 */
122{
123    size_t n;
124    char *pchar;
125
126    if ((pchar = strchr(spec, ':')) == NULL) {
127	return(XcmsFailure);
128    }
129    n = (size_t)(pchar - spec);
130
131    /*
132     * Check for proper prefix.
133     */
134    if (strncmp(spec, _XcmsCIEXYZ_prefix, n) != 0) {
135	return(XcmsFailure);
136    }
137
138    /*
139     * Attempt to parse the value portion.
140     */
141    if (sscanf(spec + n + 1, "%lf/%lf/%lf",
142	    &pColor->spec.CIEXYZ.X,
143	    &pColor->spec.CIEXYZ.Y,
144	    &pColor->spec.CIEXYZ.Z) != 3) {
145	char *s; /* Maybe failed due to locale */
146	int f;
147	if ((s = strdup(spec))) {
148	    for (f = 0; s[f]; ++f)
149		if (s[f] == '.')
150		    s[f] = ',';
151		else if (s[f] == ',')
152		    s[f] = '.';
153	    if (sscanf(s + n + 1, "%lf/%lf/%lf",
154		       &pColor->spec.CIEXYZ.X,
155		       &pColor->spec.CIEXYZ.Y,
156		       &pColor->spec.CIEXYZ.Z) != 3) {
157		free(s);
158		return(XcmsFailure);
159	    }
160	    free(s);
161	} else
162	    return(XcmsFailure);
163    }
164    pColor->format = XcmsCIEXYZFormat;
165    pColor->pixel = 0;
166    return(_XcmsCIEXYZ_ValidSpec(pColor));
167}
168
169
170/************************************************************************
171 *									*
172 *			PUBLIC ROUTINES 				*
173 *									*
174 ************************************************************************/
175
176/*
177 *	NAME
178 *		XcmsCIELab_ValidSpec
179 *
180 *	SYNOPSIS
181 */
182Status
183_XcmsCIEXYZ_ValidSpec(
184    XcmsColor *pColor)
185/*
186 *	DESCRIPTION
187 *		Checks if color specification valid for CIE XYZ
188 *
189 *	RETURNS
190 *		XcmsFailure if invalid,
191 *		XcmsSuccess if valid.
192 *
193 */
194{
195    if (pColor->format != XcmsCIEXYZFormat
196	    ||
197	    (pColor->spec.CIEXYZ.Y < 0.0 - XMY_DBL_EPSILON)
198	    ||
199	    (pColor->spec.CIEXYZ.Y > 1.0 + XMY_DBL_EPSILON)) {
200	return(XcmsFailure);
201    }
202    return(XcmsSuccess);
203}
204