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Diffstat (limited to 'libX11/src/xcms/HVCMnV.c')
| -rw-r--r-- | libX11/src/xcms/HVCMnV.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/libX11/src/xcms/HVCMnV.c b/libX11/src/xcms/HVCMnV.c new file mode 100644 index 000000000..fd33d2fac --- /dev/null +++ b/libX11/src/xcms/HVCMnV.c @@ -0,0 +1,165 @@ +/* $Xorg: HVCMnV.c,v 1.3 2000/08/17 19:44:37 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 + * TekHVCMnV.c + * + * DESCRIPTION + * Source for XcmsTekHVCQueryMinV gamut boundary querying routine. + * + */ +/* $XFree86$ */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include "Xlibint.h" +#include "Xcmsint.h" +#include "Cv.h" + +/* + * DEFINES + */ +#define EPS 0.001 + + +/************************************************************************ + * * + * PUBLIC ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * XcmsTekHVCQueryMinV - Compute minimum value for hue and chroma + * + * SYNOPSIS + */ +Status +XcmsTekHVCQueryMinV ( + XcmsCCC ccc, + XcmsFloat hue, + XcmsFloat chroma, + XcmsColor *pColor_return) + +/* + * DESCRIPTION + * Return the minimum value for a specific hue, and the + * corresponding chroma. The input color specification + * may be in any format, however output is in XcmsTekHVCFormat. + * + * Since this routine works with the value within + * pColor_return intermediate results may be returned + * even though it may be invalid. + * + * ASSUMPTIONS + * This routine assumes that the white point associated with + * the color specification is the Screen White Point. The + * Screen White Point will also be associated with the + * returned color specification. + * + * RETURNS + * XcmsFailure - Failure + * XcmsSuccess - Succeeded with no modifications + * + */ +{ + XcmsCCCRec myCCC; + XcmsColor tmp; + XcmsColor max_vc; + + /* + * Check Arguments + */ + if (ccc == NULL || pColor_return == NULL) { + return(XcmsFailure); + } + + /* + * 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 white pt */ + myCCC.gamutCompProc = (XcmsCompressionProc)NULL;/* no gamut comp func */ + + tmp.spec.TekHVC.H = hue; + tmp.spec.TekHVC.V = 100.0; + tmp.spec.TekHVC.C = chroma; + tmp.pixel = pColor_return->pixel; + tmp.format = XcmsTekHVCFormat; + + + /* Check for a valid HVC */ + if (!_XcmsTekHVC_CheckModify (&tmp)) { + 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 *)&max_vc, (char *)&tmp, sizeof(XcmsColor)); + if (_XcmsTekHVCQueryMaxVCRGB (&myCCC, max_vc.spec.TekHVC.H, &max_vc, + (XcmsRGBi *)NULL) == XcmsFailure) { + return(XcmsFailure); + } + + /* Step 2: find the intersection with the maximum hvc and chroma line. */ + if (tmp.spec.TekHVC.C > max_vc.spec.TekHVC.C + EPS) { + /* If the chroma is to large then return maximum hvc. */ + tmp.spec.TekHVC.C = max_vc.spec.TekHVC.C; + tmp.spec.TekHVC.V = max_vc.spec.TekHVC.V; + } else { + tmp.spec.TekHVC.V = tmp.spec.TekHVC.C * + max_vc.spec.TekHVC.V / max_vc.spec.TekHVC.C; + if (tmp.spec.TekHVC.V > max_vc.spec.TekHVC.V) { + tmp.spec.TekHVC.V = max_vc.spec.TekHVC.V; + } else if (tmp.spec.TekHVC.V < 0.0) { + tmp.spec.TekHVC.V = tmp.spec.TekHVC.C = 0.0; + } + } + if (_XcmsTekHVC_CheckModify (&tmp)) { + memcpy ((char *) pColor_return, (char *) &tmp, sizeof (XcmsColor)); + return(XcmsSuccess); + } else { + return(XcmsFailure); + } +} |