aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/lib/src/xcms/LabGcLC.c
diff options
context:
space:
mode:
authorMike Gabriel <mike.gabriel@das-netzwerkteam.de>2017-07-21 12:31:09 +0200
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2017-08-25 10:06:49 +0200
commitc350873c7c977efe5210484f04160be45f84ba7e (patch)
tree717d33eb315f4def1307d65108d14715696cd5cf /nx-X11/lib/src/xcms/LabGcLC.c
parent1472e7e37838f17b7ed948fa206e8c3434a9d346 (diff)
downloadnx-libs-c350873c7c977efe5210484f04160be45f84ba7e.tar.gz
nx-libs-c350873c7c977efe5210484f04160be45f84ba7e.tar.bz2
nx-libs-c350873c7c977efe5210484f04160be45f84ba7e.zip
Convert nx-X11/lib/ build flow from imake to autotools.
Diffstat (limited to 'nx-X11/lib/src/xcms/LabGcLC.c')
-rw-r--r--nx-X11/lib/src/xcms/LabGcLC.c223
1 files changed, 223 insertions, 0 deletions
diff --git a/nx-X11/lib/src/xcms/LabGcLC.c b/nx-X11/lib/src/xcms/LabGcLC.c
new file mode 100644
index 000000000..494d34e57
--- /dev/null
+++ b/nx-X11/lib/src/xcms/LabGcLC.c
@@ -0,0 +1,223 @@
+
+/*
+ * 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
+ * CIELabGcLC.c
+ *
+ * DESCRIPTION
+ * Source for XcmsCIELabClipLab() gamut
+ * compression function.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+#include <math.h>
+#include "Cv.h"
+
+/*
+ * INTERNALS
+ * Internal defines that need NOT be exported to any package or
+ * program using this package.
+ */
+#define MAXBISECTCOUNT 100
+
+
+/************************************************************************
+ * *
+ * PUBLIC ROUTINES *
+ * *
+ ************************************************************************/
+
+/*
+ * NAME
+ * XcmsCIELabClipLab - Return the closest L* and chroma
+ *
+ * SYNOPSIS
+ */
+/* ARGSUSED */
+Status
+XcmsCIELabClipLab (
+ XcmsCCC ccc,
+ XcmsColor *pColors_in_out,
+ unsigned int nColors,
+ unsigned int i,
+ Bool *pCompressed)
+/*
+ * DESCRIPTION
+ * This routine will find the closest L* and chroma
+ * for a specific hue. The color input is converted to
+ * CIE L*u*v* format and returned as CIE XYZ format.
+ *
+ * Since this routine works with the L* within
+ * pColor_in_out intermediate results may be returned
+ * even though it may be invalid.
+ *
+ * RETURNS
+ * XcmsFailure - Failure
+ * XcmsSuccess - Succeeded
+ *
+ */
+{
+ Status retval;
+ XcmsCCCRec myCCC;
+ XcmsColor *pColor;
+ XcmsColor Lab_max;
+ XcmsFloat hue, chroma, maxChroma;
+ XcmsFloat Chroma, bestChroma, Lstar, maxLstar, saveLstar;
+ XcmsFloat bestLstar, bestastar, bestbstar;
+ XcmsFloat nT, saveDist, tmpDist;
+ XcmsRGBi rgb_max;
+ int nCount, nMaxCount, nI, nILast;
+
+ /* Use my own CCC */
+ memcpy ((char *)&myCCC, (char *)ccc, sizeof(XcmsCCCRec));
+ myCCC.clientWhitePt.format = XcmsUndefinedFormat;/* inherit screen white */
+ myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut compression func */
+
+ /*
+ * Color specification passed as input can be assumed to:
+ * 1. Be in XcmsCIEXYZFormat
+ * 2. Already be white point adjusted for the Screen White Point.
+ * This means that the white point now associated with this
+ * color spec is the Screen White Point (even if the
+ * ccc->clientWhitePt differs).
+ */
+
+ pColor = pColors_in_out + i;
+
+ if (ccc->visual->class < StaticColor) {
+ /*
+ * GRAY !
+ */
+ _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
+ 1, XcmsCIELabFormat);
+ _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc),
+ 1, XcmsCIEXYZFormat);
+ if (pCompressed) {
+ *(pCompressed + i) = True;
+ }
+ return(XcmsSuccess);
+ }
+
+ /* Convert from CIEXYZ to CIELab format */
+ if (_XcmsDIConvertColors(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat)
+ == XcmsFailure) {
+ return(XcmsFailure);
+ }
+
+ /* Step 1: compute the maximum L* and chroma for this hue. */
+ /* This copy may be overkill but it preserves the pixel etc. */
+ saveLstar = pColor->spec.CIELab.L_star;
+ hue = XCMS_CIELAB_PMETRIC_HUE(pColor->spec.CIELab.a_star,
+ pColor->spec.CIELab.b_star);
+ chroma = XCMS_CIELAB_PMETRIC_CHROMA(pColor->spec.CIELab.a_star,
+ pColor->spec.CIELab.b_star);
+ memcpy((char *)&Lab_max, (char *)pColor, sizeof(XcmsColor));
+ if (_XcmsCIELabQueryMaxLCRGB (&myCCC, hue, &Lab_max, &rgb_max)
+ == XcmsFailure) {
+ return (XcmsFailure);
+ }
+ maxLstar = Lab_max.spec.CIELab.L_star;
+
+ /* Now check and return the appropriate L* */
+ if (saveLstar == maxLstar) {
+ /* When the L* input is equal to the maximum L* */
+ /* merely return the maximum Lab point. */
+ memcpy((char *)pColor, (char *)&Lab_max, sizeof(XcmsColor));
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat);
+ } else {
+ /* return the closest point on the hue leaf. */
+ /* must do a bisection here to compute the delta e. */
+ maxChroma = XCMS_CIELAB_PMETRIC_CHROMA(Lab_max.spec.CIELab.a_star,
+ Lab_max.spec.CIELab.b_star);
+ nMaxCount = MAXBISECTCOUNT;
+ nI = nMaxCount / 2;
+ bestLstar = Lstar = pColor->spec.CIELab.L_star;
+ bestastar = pColor->spec.CIELab.a_star;
+ bestbstar = pColor->spec.CIELab.b_star;
+ bestChroma = Chroma = chroma;
+ saveDist = XCMS_SQRT(((Chroma - maxChroma) * (Chroma - maxChroma)) +
+ ((Lstar - maxLstar) * (Lstar - maxLstar)));
+ for (nCount = 0; nCount < nMaxCount; nCount++) {
+ nT = (XcmsFloat) nI / (XcmsFloat) nMaxCount;
+ if (saveLstar > maxLstar) {
+ pColor->spec.RGBi.red = rgb_max.red * (1.0 - nT) + nT;
+ pColor->spec.RGBi.green = rgb_max.green * (1.0 - nT) + nT;
+ pColor->spec.RGBi.blue = rgb_max.blue * (1.0 - nT) + nT;
+ } else {
+ pColor->spec.RGBi.red = rgb_max.red - (rgb_max.red * nT);
+ pColor->spec.RGBi.green = rgb_max.green - (rgb_max.green * nT);
+ pColor->spec.RGBi.blue = rgb_max.blue - (rgb_max.blue * nT);
+ }
+ pColor->format = XcmsRGBiFormat;
+
+ /* Convert from RGBi to CIE Lab */
+ if (_XcmsConvertColorsWithWhitePt(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELabFormat,
+ (Bool *) NULL) == XcmsFailure) {
+ return (XcmsFailure);
+ }
+ chroma = XCMS_CIELAB_PMETRIC_CHROMA(pColor->spec.CIELab.a_star,
+ pColor->spec.CIELab.b_star);
+ tmpDist = XCMS_SQRT(((Chroma - chroma) * (Chroma - chroma)) +
+ ((Lstar - pColor->spec.CIELab.L_star) *
+ (Lstar - pColor->spec.CIELab.L_star)));
+ nILast = nI;
+ if (tmpDist > saveDist) {
+ nI /= 2;
+ } else {
+ nI = (nMaxCount + nI) / 2;
+ saveDist = tmpDist;
+ bestLstar = pColor->spec.CIELab.L_star;
+ bestastar = pColor->spec.CIELab.a_star;
+ bestbstar = pColor->spec.CIELab.b_star;
+ bestChroma = chroma;
+ }
+ if (nI == nILast || nI == 0) {
+ break;
+ }
+ }
+ if (bestChroma >= maxChroma) {
+ pColor->spec.CIELab.L_star = maxLstar;
+ pColor->spec.CIELab.a_star = Lab_max.spec.CIELab.a_star;
+ pColor->spec.CIELab.b_star = Lab_max.spec.CIELab.b_star;
+ } else {
+ pColor->spec.CIELab.L_star = bestLstar;
+ pColor->spec.CIELab.a_star = bestastar;
+ pColor->spec.CIELab.b_star = bestbstar;
+ }
+ retval = _XcmsDIConvertColors(&myCCC, pColor,
+ ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat);
+
+ if (retval != XcmsFailure && pCompressed != NULL) {
+ *(pCompressed + i) = True;
+ }
+ }
+ return(retval);
+}