/* * 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 * CIELuvGcC.c * * DESCRIPTION * Source for XcmsCIELuvClipuv() gamut compression routine. * */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "Xlibint.h" #include "Xcmsint.h" #include "Cv.h" /************************************************************************ * * * PUBLIC ROUTINES * * * ************************************************************************/ /* * NAME * XcmsCIELuvClipuv - Reduce the chroma for a hue and L* * * SYNOPSIS */ /* ARGSUSED */ Status XcmsCIELuvClipuv ( XcmsCCC ccc, XcmsColor *pColors_in_out, unsigned int nColors, unsigned int i, Bool *pCompressed) /* * DESCRIPTION * Reduce the Chroma for a specific hue and chroma to * to bring the given color into the gamut of the * specified device. As required of gamut compression * functions, this routine returns pColor_in_out * in XcmsCIEXYZFormat on successful completion. * * 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; XcmsColor *pColor; /* * 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 < PseudoColor) { /* * GRAY ! */ _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc), 1, XcmsCIELuvFormat); _XcmsDIConvertColors(ccc, pColor, ScreenWhitePointOfCCC(ccc), 1, XcmsCIEXYZFormat); if (pCompressed) { *(pCompressed + i) = True; } return(XcmsSuccess); } else { if (pColor->format != XcmsCIELuvFormat) { if (_XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIELuvFormat) == XcmsFailure) { return(XcmsFailure); } } if (XcmsCIELuvQueryMaxC(ccc, degrees(XCMS_CIELUV_PMETRIC_HUE(pColor->spec.CIELuv.u_star, pColor->spec.CIELuv.v_star)), pColor->spec.CIELuv.L_star, pColor) == XcmsFailure) { return(XcmsFailure); } retval = _XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat); if (retval != XcmsFailure && pCompressed != NULL) { *(pCompressed + i) = True; } return(retval); } }