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Diffstat (limited to 'libX11/src/xcms/LuvGcL.c')
| -rw-r--r-- | libX11/src/xcms/LuvGcL.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/libX11/src/xcms/LuvGcL.c b/libX11/src/xcms/LuvGcL.c new file mode 100644 index 000000000..c7ccc7503 --- /dev/null +++ b/libX11/src/xcms/LuvGcL.c @@ -0,0 +1,176 @@ +/* $Xorg: LuvGcL.c,v 1.3 2000/08/17 19:44:41 cpqbld Exp $ */ + +/* + * 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 + * CIELuvGcL.c + * + * DESCRIPTION + * Source for XcmsCIELuvClipL() gamut compression routine. + * + */ +/* $XFree86: xc/lib/X11/LuvGcL.c,v 1.3 2001/01/17 19:41:39 dawes Exp $ */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include "Xlibint.h" +#include "Xcmsint.h" +#include "Cv.h" + + +/************************************************************************ + * * + * PUBLIC ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * XcmsCIELuvClipL - Return the closest L* + * + * SYNOPSIS + */ +/* ARGSUSED */ +Status +XcmsCIELuvClipL ( + XcmsCCC ccc, + XcmsColor *pColors_in_out, + unsigned int nColors, + unsigned int i, + Bool *pCompressed) +/* + * DESCRIPTION + * Return the closest L* for a specific hue and chroma. + * This routine takes any color as input and outputs + * a CIE XYZ color. + * + * 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 + * + */ +{ + XcmsCCCRec myCCC; + XcmsColor *pColor; + XcmsColor Luv_max; + XcmsFloat hue, chroma, maxChroma; + Status retval; + + /* Use my own CCC */ + memcpy ((char *)&myCCC, (char *)ccc, sizeof(XcmsCCCRec)); + myCCC.clientWhitePt.format = XcmsUndefinedFormat;/* Inherit Screen WP */ + myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut compression */ + + /* + * 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 ! + */ + return(XcmsFailure); + } else { + /* Convert from CIEXYZ to CIE L*u*v* format */ + if (_XcmsDIConvertColors(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIELuvFormat) + == XcmsFailure) { + return(XcmsFailure); + } + + hue = XCMS_CIELUV_PMETRIC_HUE(pColor->spec.CIELuv.u_star, + pColor->spec.CIELuv.v_star); + chroma = XCMS_CIELUV_PMETRIC_CHROMA(pColor->spec.CIELuv.u_star, + pColor->spec.CIELuv.v_star); + /* Step 1: compute the maximum L* and chroma for this hue. */ + /* This copy may be overkill but it preserves the pixel etc. */ + memcpy((char *)&Luv_max, (char *)pColor, sizeof(XcmsColor)); + if (_XcmsCIELuvQueryMaxLCRGB (&myCCC, hue, &Luv_max, + (XcmsRGBi *)NULL) == XcmsFailure) { + return (XcmsFailure); + } + maxChroma = XCMS_CIELUV_PMETRIC_CHROMA(Luv_max.spec.CIELuv.u_star, + Luv_max.spec.CIELuv.v_star); + + /* Now check and return the appropriate L* */ + if (chroma == maxChroma) { + /* When the chroma input is equal to the maximum chroma */ + /* merely return the L* for that chroma. */ + memcpy((char *)pColor, (char *)&Luv_max, sizeof(XcmsColor)); + retval = _XcmsDIConvertColors(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat); + } else if (chroma > maxChroma) { + /* When the chroma input is greater than the maximum chroma */ + /* merely return the L* and chroma for the given hue. */ + memcpy((char *)pColor, (char *)&Luv_max, sizeof(XcmsColor)); + return (XcmsFailure); + } else if (pColor->spec.CIELuv.L_star < Luv_max.spec.CIELuv.L_star) { + /* Find the minimum lightness for the given chroma. */ + if (pColor->format != XcmsCIELuvFormat) { + if (_XcmsDIConvertColors(ccc, pColor, + ScreenWhitePointOfCCC(ccc), 1, XcmsCIELuvFormat) + == XcmsFailure) { + return(XcmsFailure); + } + } + if (XcmsCIELuvQueryMinL(&myCCC, degrees(hue), chroma, pColor) + == XcmsFailure) { + return (XcmsFailure); + } + retval = _XcmsDIConvertColors(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat); + } else { + /* Find the maximum lightness for the given chroma. */ + if (pColor->format != XcmsCIELuvFormat) { + if (_XcmsDIConvertColors(ccc, pColor, + ScreenWhitePointOfCCC(ccc), 1, XcmsCIELuvFormat) + == XcmsFailure) { + return(XcmsFailure); + } + } + if (XcmsCIELuvQueryMaxL(&myCCC, degrees(hue), chroma, pColor) + == XcmsFailure) { + return (XcmsFailure); + } + retval = _XcmsDIConvertColors(&myCCC, pColor, + ScreenWhitePointOfCCC(&myCCC), 1, XcmsCIEXYZFormat); + } + if (retval != XcmsFailure && pCompressed != NULL) { + *(pCompressed + i) = True; + } + return(retval); + } +} |