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author | marha <marha@users.sourceforge.net> | 2012-06-08 14:29:46 +0200 |
---|---|---|
committer | marha <marha@users.sourceforge.net> | 2012-06-08 14:50:37 +0200 |
commit | 72ec0e3bb2d7fc6b77b2a75873792f781679da6a (patch) | |
tree | 0a736ab9a8c26276929ab077dc661e3625b54884 /libX11/src/xcms/xyY.c | |
parent | 5e865910f0ce672295bd60460631339be5e311a0 (diff) | |
parent | 990bc3f015a4f8fce2eb918375defcd44980a845 (diff) | |
download | vcxsrv-72ec0e3bb2d7fc6b77b2a75873792f781679da6a.tar.gz vcxsrv-72ec0e3bb2d7fc6b77b2a75873792f781679da6a.tar.bz2 vcxsrv-72ec0e3bb2d7fc6b77b2a75873792f781679da6a.zip |
Merge remote-tracking branch 'origin/released'
Conflicts:
fontconfig/.gitignore
libX11/src/ConvSel.c
libX11/src/CrGlCur.c
libX11/src/CrWindow.c
libX11/src/GetDflt.c
libX11/src/Window.c
libX11/src/xlibi18n/XimProto.h
libX11/src/xlibi18n/lcDynamic.c
libxcb/src/.gitignore
libxcb/src/xcb_ext.c
libxcb/src/xcb_xid.c
mesalib/src/glsl/.gitignore
mesalib/src/glsl/glcpp/.gitignore
mesalib/src/mapi/glapi/gen/glX_API.xml
mesalib/src/mapi/glapi/glapi_getproc.c
mesalib/src/mesa/main/.gitignore
mesalib/src/mesa/main/syncobj.c
mesalib/src/mesa/program/.gitignore
xkbcomp/listing.c
xkbcomp/xkbpath.c
xorg-server/.gitignore
xorg-server/Xext/xvmain.c
xorg-server/dix/dispatch.c
xorg-server/hw/xwin/glx/winpriv.h
xorg-server/hw/xwin/winprefsyacc.y
xorg-server/hw/xwin/winscrinit.c
xorg-server/xkeyboard-config/rules/bin/ml1_s.sh
xorg-server/xkeyboard-config/rules/bin/ml1v1_s.sh
xorg-server/xkeyboard-config/rules/bin/ml1v_s.sh
xorg-server/xkeyboard-config/rules/bin/ml_s.sh
xorg-server/xkeyboard-config/rules/bin/mlv_s.sh
xorg-server/xkeyboard-config/rules/compat/.gitignore
Diffstat (limited to 'libX11/src/xcms/xyY.c')
-rw-r--r-- | libX11/src/xcms/xyY.c | 790 |
1 files changed, 395 insertions, 395 deletions
diff --git a/libX11/src/xcms/xyY.c b/libX11/src/xcms/xyY.c index 6f9457496..6f6562621 100644 --- a/libX11/src/xcms/xyY.c +++ b/libX11/src/xcms/xyY.c @@ -1,395 +1,395 @@ - -/* - * 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 - * CIExyY.c - * - * DESCRIPTION - * This file contains routines that support the CIE xyY - * 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 <stdio.h> -#include <X11/Xos.h> -#include "Xlibint.h" -#include "Xcmsint.h" -#include "Cv.h" - -/* - * DEFINES - */ -#define EPS 0.00001 /* some extremely small number */ -#ifdef DBL_EPSILON -# define XMY_DBL_EPSILON DBL_EPSILON -#else -# define XMY_DBL_EPSILON 0.00001 -#endif - -/* - * FORWARD DECLARATIONS - */ - -static int CIExyY_ParseString(register char *spec, XcmsColor *pColor); -static Status XcmsCIExyY_ValidSpec(XcmsColor *pColor); - - -/* - * LOCAL VARIABLES - */ - - /* - * NULL terminated list of functions applied to get from CIExyY to CIEXYZ - */ -static XcmsConversionProc Fl_CIExyY_to_CIEXYZ[] = { - XcmsCIExyYToCIEXYZ, - NULL -}; - - /* - * NULL terminated list of functions applied to get from CIEXYZ to CIExyY - */ -static XcmsConversionProc Fl_CIEXYZ_to_CIExyY[] = { - XcmsCIEXYZToCIExyY, - NULL -}; - - -/* - * GLOBALS - */ - - /* - * CIE xyY Color Space - */ -XcmsColorSpace XcmsCIExyYColorSpace = - { - _XcmsCIExyY_prefix, /* prefix */ - XcmsCIExyYFormat, /* id */ - CIExyY_ParseString, /* parseString */ - Fl_CIExyY_to_CIEXYZ, /* to_CIEXYZ */ - Fl_CIEXYZ_to_CIExyY, /* from_CIEXYZ */ - 1 - }; - - - -/************************************************************************ - * * - * PRIVATE ROUTINES * - * * - ************************************************************************/ - -/* - * NAME - * CIExyY_ParseString - * - * SYNOPSIS - */ -static int -CIExyY_ParseString( - register char *spec, - XcmsColor *pColor) -/* - * DESCRIPTION - * This routines takes a string and attempts to convert - * it into a XcmsColor structure with XcmsCIExyYFormat. - * The assumed CIExyY string syntax is: - * CIExyY:<x>/<y>/<Y> - * Where x, y, 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, _XcmsCIExyY_prefix, n) != 0) { - return(XcmsFailure); - } - - /* - * Attempt to parse the value portion. - */ - if (sscanf(spec + n + 1, "%lf/%lf/%lf", - &pColor->spec.CIExyY.x, - &pColor->spec.CIExyY.y, - &pColor->spec.CIExyY.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.CIExyY.x, - &pColor->spec.CIExyY.y, - &pColor->spec.CIExyY.Y) != 3) { - free(s); - return(XcmsFailure); - } - free(s); - } else - return(XcmsFailure); - } - pColor->format = XcmsCIExyYFormat; - pColor->pixel = 0; - return(XcmsCIExyY_ValidSpec(pColor)); -} - - - -/************************************************************************ - * * - * PUBLIC ROUTINES * - * * - ************************************************************************/ - -/* - * NAME - * CIExyY_ValidSpec() - * - * SYNOPSIS - */ -static Status -XcmsCIExyY_ValidSpec( - XcmsColor *pColor) -/* - * DESCRIPTION - * Checks a valid CIExyY color specification. - * - * RETURNS - * XcmsFailure if invalid. - * XcmsSuccess if valid. - * - */ -{ - if (pColor->format != XcmsCIExyYFormat - || - (pColor->spec.CIExyY.x < 0.0 - XMY_DBL_EPSILON) - || - (pColor->spec.CIExyY.x > 1.0 + XMY_DBL_EPSILON) - || - (pColor->spec.CIExyY.y < 0.0 - XMY_DBL_EPSILON) - || - (pColor->spec.CIExyY.y > 1.0 + XMY_DBL_EPSILON) - || - (pColor->spec.CIExyY.Y < 0.0 - XMY_DBL_EPSILON) - || - (pColor->spec.CIExyY.Y > 1.0 + XMY_DBL_EPSILON)) { - return(XcmsFailure); - } - return(XcmsSuccess); -} - - -/* - * NAME - * XcmsCIExyYToCIEXYZ - convert CIExyY to CIEXYZ - * - * SYNOPSIS - */ -Status -XcmsCIExyYToCIEXYZ( - XcmsCCC ccc, - XcmsColor *pxyY_WhitePt, - XcmsColor *pColors_in_out, - unsigned int nColors) -/* - * DESCRIPTION - * Converts color specifications in an array of XcmsColor - * structures from CIExyY format to CIEXYZ format. - * - * RETURNS - * XcmsFailure if failed, - * XcmsSuccess if succeeded. - */ -{ - XcmsColor *pColor = pColors_in_out; - XcmsColor whitePt; - XcmsCIEXYZ XYZ_return; - XcmsFloat div; /* temporary storage in case divisor is zero */ - XcmsFloat u, v, x, y, z; /* temporary storage */ - register int i; - - /* - * Check arguments - */ - if (pxyY_WhitePt == NULL || 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 CIExyY and valid */ - if (!XcmsCIExyY_ValidSpec(pColor)) { - return(XcmsFailure); - } - - if ((div = (-2 * pColor->spec.CIExyY.x) + (12 * pColor->spec.CIExyY.y) + 3) == 0.0) { - /* Note that the divisor is zero */ - /* This return is abitrary. */ - XYZ_return.X = 0; - XYZ_return.Y = 0; - XYZ_return.Z = 0; - } else { - /* - * Make sure white point is in CIEXYZ form - */ - if (pxyY_WhitePt->format != XcmsCIEXYZFormat) { - /* Make copy of the white point because we're going to modify it */ - memcpy((char *)&whitePt, (char *)pxyY_WhitePt, sizeof(XcmsColor)); - if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1, - XcmsCIEXYZFormat)) { - return(XcmsFailure); - } - pxyY_WhitePt = &whitePt; - } - - /* Make sure it is a white point, i.e., Y == 1.0 */ - if (pxyY_WhitePt->spec.CIEXYZ.Y != 1.0) { - return(XcmsFailure); - } - - /* Convert from xyY to uvY to XYZ */ - u = (4 * pColor->spec.CIExyY.x) / div; - v = (9 * pColor->spec.CIExyY.y) / div; - div = (6.0 * u) - (16.0 * v) + 12.0; - if (div == 0.0) { - /* Note that the divisor is zero */ - /* This return is abitrary. */ - if ((div = (6.0 * whitePt.spec.CIEuvY.u_prime) - - (16.0 * whitePt.spec.CIEuvY.v_prime) + 12.0) == 0.0) { - div = EPS; - } - x = 9.0 * whitePt.spec.CIEuvY.u_prime / div; - y = 4.0 * whitePt.spec.CIEuvY.u_prime / div; - } else { - /* convert u, v to small xyz */ - x = 9.0 * u / div; - y = 4.0 * v / div; - } - z = 1.0 - x - y; - if (y == 0.0) y = EPS; /* Have to worry about divide by 0 */ - XYZ_return.Y = pColor->spec.CIExyY.Y; - XYZ_return.X = x * XYZ_return.Y / y; - XYZ_return.Z = z * XYZ_return.Y / y; - } - - /* Copy result to pColor */ - memcpy ((char *)&pColor->spec, (char *)&XYZ_return, sizeof(XcmsCIEXYZ)); - - /* Identify that the format is now CIEXYZ */ - pColor->format = XcmsCIEXYZFormat; - } - return(XcmsSuccess); -} - - -/* - * NAME - * XcmsCIEXYZToCIExyY - convert CIEXYZ to CIExyY - * - * SYNOPSIS - */ -/* ARGSUSED */ -Status -XcmsCIEXYZToCIExyY( - XcmsCCC ccc, - XcmsColor *pxyY_WhitePt, - XcmsColor *pColors_in_out, - unsigned int nColors) -/* - * DESCRIPTION - * Converts color specifications in an array of XcmsColor - * structures from CIEXYZ format to CIExyY format. - * - * RETURNS - * XcmsFailure if failed, - * XcmsSuccess if succeeded. - * - */ -{ - XcmsColor *pColor = pColors_in_out; - XcmsCIExyY xyY_return; - XcmsFloat div; /* temporary storage in case divisor is zero */ - register int i; - - /* - * Check arguments - * pxyY_WhitePt ignored - */ - if (pColors_in_out == NULL) { - return(XcmsFailure); - } - - /* - * Now convert each XcmsColor structure to CIEXYZ form - */ - for (i = 0; i < nColors; i++, pColor++) { - - if (!_XcmsCIEXYZ_ValidSpec(pColor)) { - return(XcmsFailure); - } - /* Now convert for XYZ to xyY */ - if ((div = pColor->spec.CIEXYZ.X + pColor->spec.CIEXYZ.Y + pColor->spec.CIEXYZ.Z) == 0.0) { - div = EPS; - } - xyY_return.x = pColor->spec.CIEXYZ.X / div; - xyY_return.y = pColor->spec.CIEXYZ.Y / div; - xyY_return.Y = pColor->spec.CIEXYZ.Y; - - /* Copy result to pColor */ - memcpy ((char *)&pColor->spec, (char *)&xyY_return, sizeof(XcmsCIExyY)); - - /* Identify that the format is now CIEXYZ */ - pColor->format = XcmsCIExyYFormat; - } - 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
+ * CIExyY.c
+ *
+ * DESCRIPTION
+ * This file contains routines that support the CIE xyY
+ * 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 <stdio.h>
+#include <X11/Xos.h>
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include "Cv.h"
+
+/*
+ * DEFINES
+ */
+#define EPS 0.00001 /* some extremely small number */
+#ifdef DBL_EPSILON
+# define XMY_DBL_EPSILON DBL_EPSILON
+#else
+# define XMY_DBL_EPSILON 0.00001
+#endif
+
+/*
+ * FORWARD DECLARATIONS
+ */
+
+static int CIExyY_ParseString(register char *spec, XcmsColor *pColor);
+static Status XcmsCIExyY_ValidSpec(XcmsColor *pColor);
+
+
+/*
+ * LOCAL VARIABLES
+ */
+
+ /*
+ * NULL terminated list of functions applied to get from CIExyY to CIEXYZ
+ */
+static XcmsConversionProc Fl_CIExyY_to_CIEXYZ[] = {
+ XcmsCIExyYToCIEXYZ,
+ NULL
+};
+
+ /*
+ * NULL terminated list of functions applied to get from CIEXYZ to CIExyY
+ */
+static XcmsConversionProc Fl_CIEXYZ_to_CIExyY[] = {
+ XcmsCIEXYZToCIExyY,
+ NULL
+};
+
+
+/*
+ * GLOBALS
+ */
+
+ /*
+ * CIE xyY Color Space
+ */
+XcmsColorSpace XcmsCIExyYColorSpace =
+ {
+ _XcmsCIExyY_prefix, /* prefix */
+ XcmsCIExyYFormat, /* id */
+ CIExyY_ParseString, /* parseString */
+ Fl_CIExyY_to_CIEXYZ, /* to_CIEXYZ */
+ Fl_CIEXYZ_to_CIExyY, /* from_CIEXYZ */
+ 1
+ };
+
+
+
+/************************************************************************
+ * *
+ * PRIVATE ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * CIExyY_ParseString
+ *
+ * SYNOPSIS
+ */
+static int
+CIExyY_ParseString(
+ register char *spec,
+ XcmsColor *pColor)
+/*
+ * DESCRIPTION
+ * This routines takes a string and attempts to convert
+ * it into a XcmsColor structure with XcmsCIExyYFormat.
+ * The assumed CIExyY string syntax is:
+ * CIExyY:<x>/<y>/<Y>
+ * Where x, y, 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, _XcmsCIExyY_prefix, n) != 0) {
+ return(XcmsFailure);
+ }
+
+ /*
+ * Attempt to parse the value portion.
+ */
+ if (sscanf(spec + n + 1, "%lf/%lf/%lf",
+ &pColor->spec.CIExyY.x,
+ &pColor->spec.CIExyY.y,
+ &pColor->spec.CIExyY.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.CIExyY.x,
+ &pColor->spec.CIExyY.y,
+ &pColor->spec.CIExyY.Y) != 3) {
+ free(s);
+ return(XcmsFailure);
+ }
+ free(s);
+ } else
+ return(XcmsFailure);
+ }
+ pColor->format = XcmsCIExyYFormat;
+ pColor->pixel = 0;
+ return(XcmsCIExyY_ValidSpec(pColor));
+}
+
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * CIExyY_ValidSpec()
+ *
+ * SYNOPSIS
+ */
+static Status
+XcmsCIExyY_ValidSpec(
+ XcmsColor *pColor)
+/*
+ * DESCRIPTION
+ * Checks a valid CIExyY color specification.
+ *
+ * RETURNS
+ * XcmsFailure if invalid.
+ * XcmsSuccess if valid.
+ *
+ */
+{
+ if (pColor->format != XcmsCIExyYFormat
+ ||
+ (pColor->spec.CIExyY.x < 0.0 - XMY_DBL_EPSILON)
+ ||
+ (pColor->spec.CIExyY.x > 1.0 + XMY_DBL_EPSILON)
+ ||
+ (pColor->spec.CIExyY.y < 0.0 - XMY_DBL_EPSILON)
+ ||
+ (pColor->spec.CIExyY.y > 1.0 + XMY_DBL_EPSILON)
+ ||
+ (pColor->spec.CIExyY.Y < 0.0 - XMY_DBL_EPSILON)
+ ||
+ (pColor->spec.CIExyY.Y > 1.0 + XMY_DBL_EPSILON)) {
+ return(XcmsFailure);
+ }
+ return(XcmsSuccess);
+}
+
+
+/*
+ * NAME
+ * XcmsCIExyYToCIEXYZ - convert CIExyY to CIEXYZ
+ *
+ * SYNOPSIS
+ */
+Status
+XcmsCIExyYToCIEXYZ(
+ XcmsCCC ccc,
+ XcmsColor *pxyY_WhitePt,
+ XcmsColor *pColors_in_out,
+ unsigned int nColors)
+/*
+ * DESCRIPTION
+ * Converts color specifications in an array of XcmsColor
+ * structures from CIExyY format to CIEXYZ format.
+ *
+ * RETURNS
+ * XcmsFailure if failed,
+ * XcmsSuccess if succeeded.
+ */
+{
+ XcmsColor *pColor = pColors_in_out;
+ XcmsColor whitePt;
+ XcmsCIEXYZ XYZ_return;
+ XcmsFloat div; /* temporary storage in case divisor is zero */
+ XcmsFloat u, v, x, y, z; /* temporary storage */
+ register int i;
+
+ /*
+ * Check arguments
+ */
+ if (pxyY_WhitePt == NULL || 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 CIExyY and valid */
+ if (!XcmsCIExyY_ValidSpec(pColor)) {
+ return(XcmsFailure);
+ }
+
+ if ((div = (-2 * pColor->spec.CIExyY.x) + (12 * pColor->spec.CIExyY.y) + 3) == 0.0) {
+ /* Note that the divisor is zero */
+ /* This return is abitrary. */
+ XYZ_return.X = 0;
+ XYZ_return.Y = 0;
+ XYZ_return.Z = 0;
+ } else {
+ /*
+ * Make sure white point is in CIEXYZ form
+ */
+ if (pxyY_WhitePt->format != XcmsCIEXYZFormat) {
+ /* Make copy of the white point because we're going to modify it */
+ memcpy((char *)&whitePt, (char *)pxyY_WhitePt, sizeof(XcmsColor));
+ if (!_XcmsDIConvertColors(ccc, &whitePt, (XcmsColor *)NULL, 1,
+ XcmsCIEXYZFormat)) {
+ return(XcmsFailure);
+ }
+ pxyY_WhitePt = &whitePt;
+ }
+
+ /* Make sure it is a white point, i.e., Y == 1.0 */
+ if (pxyY_WhitePt->spec.CIEXYZ.Y != 1.0) {
+ return(XcmsFailure);
+ }
+
+ /* Convert from xyY to uvY to XYZ */
+ u = (4 * pColor->spec.CIExyY.x) / div;
+ v = (9 * pColor->spec.CIExyY.y) / div;
+ div = (6.0 * u) - (16.0 * v) + 12.0;
+ if (div == 0.0) {
+ /* Note that the divisor is zero */
+ /* This return is abitrary. */
+ if ((div = (6.0 * whitePt.spec.CIEuvY.u_prime) -
+ (16.0 * whitePt.spec.CIEuvY.v_prime) + 12.0) == 0.0) {
+ div = EPS;
+ }
+ x = 9.0 * whitePt.spec.CIEuvY.u_prime / div;
+ y = 4.0 * whitePt.spec.CIEuvY.u_prime / div;
+ } else {
+ /* convert u, v to small xyz */
+ x = 9.0 * u / div;
+ y = 4.0 * v / div;
+ }
+ z = 1.0 - x - y;
+ if (y == 0.0) y = EPS; /* Have to worry about divide by 0 */
+ XYZ_return.Y = pColor->spec.CIExyY.Y;
+ XYZ_return.X = x * XYZ_return.Y / y;
+ XYZ_return.Z = z * XYZ_return.Y / y;
+ }
+
+ /* Copy result to pColor */
+ memcpy ((char *)&pColor->spec, (char *)&XYZ_return, sizeof(XcmsCIEXYZ));
+
+ /* Identify that the format is now CIEXYZ */
+ pColor->format = XcmsCIEXYZFormat;
+ }
+ return(XcmsSuccess);
+}
+
+
+/*
+ * NAME
+ * XcmsCIEXYZToCIExyY - convert CIEXYZ to CIExyY
+ *
+ * SYNOPSIS
+ */
+/* ARGSUSED */
+Status
+XcmsCIEXYZToCIExyY(
+ XcmsCCC ccc,
+ XcmsColor *pxyY_WhitePt,
+ XcmsColor *pColors_in_out,
+ unsigned int nColors)
+/*
+ * DESCRIPTION
+ * Converts color specifications in an array of XcmsColor
+ * structures from CIEXYZ format to CIExyY format.
+ *
+ * RETURNS
+ * XcmsFailure if failed,
+ * XcmsSuccess if succeeded.
+ *
+ */
+{
+ XcmsColor *pColor = pColors_in_out;
+ XcmsCIExyY xyY_return;
+ XcmsFloat div; /* temporary storage in case divisor is zero */
+ register int i;
+
+ /*
+ * Check arguments
+ * pxyY_WhitePt ignored
+ */
+ if (pColors_in_out == NULL) {
+ return(XcmsFailure);
+ }
+
+ /*
+ * Now convert each XcmsColor structure to CIEXYZ form
+ */
+ for (i = 0; i < nColors; i++, pColor++) {
+
+ if (!_XcmsCIEXYZ_ValidSpec(pColor)) {
+ return(XcmsFailure);
+ }
+ /* Now convert for XYZ to xyY */
+ if ((div = pColor->spec.CIEXYZ.X + pColor->spec.CIEXYZ.Y + pColor->spec.CIEXYZ.Z) == 0.0) {
+ div = EPS;
+ }
+ xyY_return.x = pColor->spec.CIEXYZ.X / div;
+ xyY_return.y = pColor->spec.CIEXYZ.Y / div;
+ xyY_return.Y = pColor->spec.CIEXYZ.Y;
+
+ /* Copy result to pColor */
+ memcpy ((char *)&pColor->spec, (char *)&xyY_return, sizeof(XcmsCIExyY));
+
+ /* Identify that the format is now CIEXYZ */
+ pColor->format = XcmsCIExyYFormat;
+ }
+ return(XcmsSuccess);
+}
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