diff options
Diffstat (limited to 'libX11/src/xcms/HVCGcV.c')
| -rw-r--r-- | libX11/src/xcms/HVCGcV.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/libX11/src/xcms/HVCGcV.c b/libX11/src/xcms/HVCGcV.c new file mode 100644 index 000000000..b6761c8f6 --- /dev/null +++ b/libX11/src/xcms/HVCGcV.c @@ -0,0 +1,203 @@ +/* $Xorg: HVCGcV.c,v 1.3 2000/08/17 19:44:36 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. TekColor is a + * trademark of Tektronix, Inc. The term "TekHVC" designates a particular + * color space that is the subject of U.S. Patent No. 4,985,853 (equivalent + * foreign patents pending). 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: + * + * 1. This copyright, permission, and disclaimer notice is reproduced in + * all copies of this software and any modification thereof and in + * supporting documentation; + * 2. Any color-handling application which displays TekHVC color + * cooordinates identifies these as TekHVC color coordinates in any + * interface that displays these coordinates and in any associated + * documentation; + * 3. The term "TekHVC" is always used, and is only used, in association + * with the mathematical derivations of the TekHVC Color Space, + * including those provided in this file and any equivalent pathways and + * mathematical derivations, regardless of digital (e.g., floating point + * or integer) representation. + * + * 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 + * TekHVCGcV.c + * + * DESCRIPTION + * Source for XcmsTekHVCClipV() gamut compression routine. + * + */ +/* $XFree86: xc/lib/X11/HVCGcV.c,v 1.3 2001/01/17 19:41:37 dawes Exp $ */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include "Xlibint.h" +#include "Xcmsint.h" +#include "Cv.h" + + +/************************************************************************ + * * + * PUBLIC ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * XcmsTekHVCClipV - Return the closest value + * + * SYNOPSIS + */ +/* ARGSUSED */ +Status +XcmsTekHVCClipV ( + XcmsCCC ccc, + XcmsColor *pColors_in_out, + unsigned int nColors, + unsigned int i, + Bool *pCompressed) +/* + * DESCRIPTION + * Return the closest value 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 value within + * pColor_in_out intermediate results may be returned + * even though it may be invalid. + * + * RETURNS + * XcmsFailure - Failure + * XcmsSuccess - Succeeded + * + */ +{ + XcmsColor *pColor; + XcmsColor hvc_max; + XcmsCCCRec myCCC; + Status retval; + + /* + * Insure TekHVC installed + */ + if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) { + return(XcmsFailure); + } + + /* 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 && + FunctionSetOfCCC(ccc) != (XPointer) &XcmsLinearRGBFunctionSet) { + /* + * GRAY ! + */ + return(XcmsFailure); + } else { + /* Convert from CIEXYZ to TekHVC format */ + if (_XcmsDIConvertColors(&myCCC, pColor, + &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat) + == XcmsFailure) { + return(XcmsFailure); + } + + /* check to make sure we have a valid TekHVC number */ + if (!_XcmsTekHVC_CheckModify (pColor)) { + return (XcmsFailure); + } + + /* Step 1: compute the maximum value and chroma for this hue. */ + /* This copy may be overkill but it preserves the pixel etc. */ + memcpy((char *)&hvc_max, (char *)pColor, sizeof(XcmsColor)); + if (_XcmsTekHVCQueryMaxVCRGB (&myCCC, hvc_max.spec.TekHVC.H, &hvc_max, + (XcmsRGBi *)NULL) == XcmsFailure) { + return (XcmsFailure); + } + + /* Now check and return the appropriate value */ + if (pColor->spec.TekHVC.C == hvc_max.spec.TekHVC.C) { + /* When the chroma input is equal to the maximum chroma */ + /* merely return the value for that chroma. */ + pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V; + if (!_XcmsTekHVC_CheckModify (pColor)) { + return (XcmsFailure); + } + retval = _XcmsDIConvertColors(&myCCC, pColor, + &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat); + } else if (pColor->spec.TekHVC.C > hvc_max.spec.TekHVC.C) { + /* When the chroma input is greater than the maximum chroma */ + /* merely return the value and chroma for the given hue. */ + pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C; + pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V; + return (XcmsFailure); + } else if (pColor->spec.TekHVC.V < hvc_max.spec.TekHVC.V) { + /* When the value input is less than the maximum value point */ + /* compute the intersection of the line from 0,0 to max_V, max_C */ + /* using the chroma input. */ + pColor->spec.TekHVC.V = pColor->spec.TekHVC.C * + hvc_max.spec.TekHVC.V / hvc_max.spec.TekHVC.C; + if (pColor->spec.TekHVC.V >= hvc_max.spec.TekHVC.V) { + pColor->spec.TekHVC.C = hvc_max.spec.TekHVC.C; + pColor->spec.TekHVC.V = hvc_max.spec.TekHVC.V; + } + if (!_XcmsTekHVC_CheckModify (pColor)) { + return (XcmsFailure); + } + retval = _XcmsDIConvertColors(&myCCC, pColor, + &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat); + } else { + /* When the value input is greater than the maximum value point */ + /* use HvcMaxValue to find the maximum value for the given chroma. */ + if (pColor->format != XcmsTekHVCFormat) { + if (_XcmsDIConvertColors(ccc, pColor, + &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat) + == XcmsFailure) { + return(XcmsFailure); + } + } + if (XcmsTekHVCQueryMaxV(&myCCC, + pColor->spec.TekHVC.H, + pColor->spec.TekHVC.C, + pColor) + == XcmsFailure) { + return (XcmsFailure); + } + retval = _XcmsDIConvertColors(&myCCC, pColor, + &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat); + } + if (retval != XcmsFailure && pCompressed != NULL) { + *(pCompressed + i) = True; + } + return(retval); + } +} |