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diff --git a/nx-X11/lib/X11/uvY.c b/nx-X11/lib/X11/uvY.c
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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
- * 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 <nx-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.
- */
-{
- size_t n;
- char *pchar;
-
- if ((pchar = strchr(spec, ':')) == NULL) {
- return(XcmsFailure);
- }
- n = (size_t)(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;
- unsigned 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;
- unsigned 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);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-06 02:36:27 +0000