186 lines
4.4 KiB
C
186 lines
4.4 KiB
C
/* $Xorg: XYZ.c,v 1.3 2000/08/17 19:45:04 cpqbld Exp $ */
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/*
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* Code and supporting documentation (c) Copyright 1990 1991 Tektronix, Inc.
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* All Rights Reserved
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*
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* This file is a component of an X Window System-specific implementation
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* of XCMS based on the TekColor Color Management System. Permission is
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* hereby granted to use, copy, modify, sell, and otherwise distribute this
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* software and its documentation for any purpose and without fee, provided
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* that this copyright, permission, and disclaimer notice is reproduced in
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* all copies of this software and in supporting documentation. TekColor
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* is a trademark of Tektronix, Inc.
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*
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* Tektronix makes no representation about the suitability of this software
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* for any purpose. It is provided "as is" and with all faults.
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*
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* TEKTRONIX DISCLAIMS ALL WARRANTIES APPLICABLE TO THIS SOFTWARE,
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* INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE. IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR THE PERFORMANCE OF THIS SOFTWARE.
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*
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*
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*
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* NAME
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* CIEXYZ.c
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*
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* DESCRIPTION
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* CIE XYZ Color Space
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*
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*
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*/
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/* $XFree86: xc/lib/X11/XYZ.c,v 1.4 2003/04/13 19:22:19 dawes Exp $ */
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#include <X11/Xos.h>
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#include "Xlibint.h"
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#include "Xcmsint.h"
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#include "Cv.h"
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#include <stdio.h> /* sscanf */
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/*
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* DEFINES
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* Internal definitions that need NOT be exported to any package
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* or program using this package.
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*/
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#ifdef DBL_EPSILON
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# define XMY_DBL_EPSILON DBL_EPSILON
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#else
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# define XMY_DBL_EPSILON 0.00001
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#endif
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/*
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* FORWARD DECLARATIONS
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*/
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static int CIEXYZ_ParseString(register char *spec, XcmsColor *pColor);
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/*
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* LOCALS VARIABLES
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*/
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static XcmsConversionProc Fl_CIEXYZ_to_CIEXYZ[] = {
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NULL
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};
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/*
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* GLOBALS
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* Variables declared in this package that are allowed
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* to be used globally.
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*/
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/*
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* CIE XYZ Color Space
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*/
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XcmsColorSpace XcmsCIEXYZColorSpace =
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{
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_XcmsCIEXYZ_prefix, /* prefix */
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XcmsCIEXYZFormat, /* id */
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CIEXYZ_ParseString, /* parseString */
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Fl_CIEXYZ_to_CIEXYZ, /* to_CIEXYZ */
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Fl_CIEXYZ_to_CIEXYZ, /* from_CIEXYZ */
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1
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};
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/************************************************************************
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* *
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* PRIVATE ROUTINES *
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* *
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************************************************************************/
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/*
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* NAME
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* CIEXYZ_ParseString
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*
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* SYNOPSIS
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*/
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static int
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CIEXYZ_ParseString(
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register char *spec,
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XcmsColor *pColor)
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/*
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* DESCRIPTION
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* This routines takes a string and attempts to convert
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* it into a XcmsColor structure with XcmsCIEXYZFormat.
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* The assumed CIEXYZ string syntax is:
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* CIEXYZ:<X>/<Y>/<Z>
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* Where X, Y, and Z are in string input format for floats
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* consisting of:
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* a. an optional sign
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* b. a string of numbers possibly containing a decimal point,
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* c. an optional exponent field containing an 'E' or 'e'
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* followed by a possibly signed integer string.
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*
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* RETURNS
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*/
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{
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int n;
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char *pchar;
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if ((pchar = strchr(spec, ':')) == NULL) {
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return(XcmsFailure);
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}
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n = (int)(pchar - spec);
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/*
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* Check for proper prefix.
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*/
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if (strncmp(spec, _XcmsCIEXYZ_prefix, n) != 0) {
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return(XcmsFailure);
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}
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/*
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* Attempt to parse the value portion.
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*/
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if (sscanf(spec + n + 1, "%lf/%lf/%lf",
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&pColor->spec.CIEXYZ.X,
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&pColor->spec.CIEXYZ.Y,
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&pColor->spec.CIEXYZ.Z) != 3) {
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return(XcmsFailure);
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}
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pColor->format = XcmsCIEXYZFormat;
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pColor->pixel = 0;
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return(_XcmsCIEXYZ_ValidSpec(pColor));
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}
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/************************************************************************
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* *
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* PUBLIC ROUTINES *
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* *
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************************************************************************/
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/*
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* NAME
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* XcmsCIELab_ValidSpec
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*
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* SYNOPSIS
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*/
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Status
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_XcmsCIEXYZ_ValidSpec(
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XcmsColor *pColor)
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/*
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* DESCRIPTION
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* Checks if color specification valid for CIE XYZ
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*
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* RETURNS
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* XcmsFailure if invalid,
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* XcmsSuccess if valid.
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*
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*/
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{
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if (pColor->format != XcmsCIEXYZFormat
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(pColor->spec.CIEXYZ.Y < 0.0 - XMY_DBL_EPSILON)
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(pColor->spec.CIEXYZ.Y > 1.0 + XMY_DBL_EPSILON)) {
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return(XcmsFailure);
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}
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return(XcmsSuccess);
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}
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