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Diffstat (limited to 'src/xcms/HVCGcC.c')
| -rw-r--r-- | src/xcms/HVCGcC.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/xcms/HVCGcC.c b/src/xcms/HVCGcC.c new file mode 100644 index 00000000..26a3f121 --- /dev/null +++ b/src/xcms/HVCGcC.c @@ -0,0 +1,153 @@ +/* $Xorg: HVCGcC.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 + * TekHVCGcC.c + * + * DESCRIPTION + * Source for XcmsTekHVCClipC() gamut compression routine. + * + */ + +#include "Xlibint.h" +#include "Xcmsint.h" + +/* + * EXTERNS + */ +extern XcmsColorSpace XcmsTekHVCColorSpace; +extern XcmsFunctionSet XcmsLinearRGBFunctionSet; + + + +/************************************************************************ + * * + * PUBLIC ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * XcmsTekHVCClipC - Reduce the chroma for a hue and value + * + * SYNOPSIS + */ +/* ARGSUSED */ +Status +XcmsTekHVCClipC (ccc, pColors_in_out, nColors, i, pCompressed) + XcmsCCC ccc; + XcmsColor *pColors_in_out; + unsigned int nColors; + unsigned int i; + Bool *pCompressed; +/* + * DESCRIPTION + * Reduce the Chroma for a specific hue and value to + * to bring the given color into the gamut of the + * specified device. As required of gamut compression + * functions in Xcms, this routine returns pColor_in_out + * in XcmsCIEXYZFormat on successful completion. + * + * 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 + * + */ +{ + 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). + */ + + /* + * Insure TekHVC installed + */ + if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) { + return(XcmsFailure); + } + + pColor = pColors_in_out + i; + + if (ccc->visual->class < StaticColor && + FunctionSetOfCCC(ccc) != (XPointer) &XcmsLinearRGBFunctionSet) { + /* + * GRAY ! + */ + _XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt, + 1, XcmsTekHVCFormat); + pColor->spec.TekHVC.H = pColor->spec.TekHVC.C = 0.0; + _XcmsDIConvertColors(ccc, pColor, &ccc->pPerScrnInfo->screenWhitePt, + 1, XcmsCIEXYZFormat); + if (pCompressed) { + *(pCompressed + i) = True; + } + return(XcmsSuccess); + } else { + if (pColor->format != XcmsTekHVCFormat) { + if (_XcmsDIConvertColors(ccc, pColor, + &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat) + == XcmsFailure) { + return(XcmsFailure); + } + } + if (XcmsTekHVCQueryMaxC(ccc, + pColor->spec.TekHVC.H, + pColor->spec.TekHVC.V, + pColor) + == XcmsFailure) { + return(XcmsFailure); + } + retval = _XcmsDIConvertColors(ccc, pColor, + &ccc->pPerScrnInfo->screenWhitePt, 1, XcmsCIEXYZFormat); + if (retval != XcmsFailure && pCompressed != NULL) { + *(pCompressed + i) = True; + } + return(retval); + } +} |