/* * 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 * TekHVCMxVs.c * * DESCRIPTION * Source for the XcmsTekHVCQueryMaxVSamples() gamut boundary * querying routine. */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "Xlibint.h" #include "Xcmsint.h" #include "Cv.h" /************************************************************************ * * * PUBLIC ROUTINES * * * ************************************************************************/ /* * NAME * XcmsTekHVCQueryMaxVSamples - Compute a set of value/chroma * pairs. * * SYNOPSIS */ Status XcmsTekHVCQueryMaxVSamples( XcmsCCC ccc, XcmsFloat hue, XcmsColor *pColor_in_out, unsigned int nSamples) /* * DESCRIPTION * Return a set of values and chromas for the input Hue. * This routine will take any color as input. * It returns TekHVC colors. * * Since this routine works with the value within * pColor_in_out 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 * */ { XcmsCCCRec myCCC; XcmsColor *pHVC; XcmsRGBi rgb_saved; unsigned short nI; XcmsFloat nT; /* * Check Arguments */ if (ccc == NULL || pColor_in_out == NULL || nSamples == 0) { return(XcmsFailure); } /* * Insure TekHVC installed */ if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) { return(XcmsFailure); } /* setup the CCC to use for the conversions. */ memcpy ((char *) &myCCC, (char *) ccc, sizeof(XcmsCCCRec)); myCCC.clientWhitePt.format = XcmsUndefinedFormat; myCCC.gamutCompProc = (XcmsCompressionProc) NULL; /* Step 1: compute the maximum value and chroma for this hue. */ /* save the Hue for use later. */ while (hue < 0.0) { hue += 360.0; } while (hue > 360.0) { hue -= 360.0; } pColor_in_out->spec.TekHVC.H = hue; pColor_in_out->format = XcmsTekHVCFormat; /* Get the maximum value and chroma point for this hue */ if (_XcmsTekHVCQueryMaxVCRGB(&myCCC, pColor_in_out->spec.TekHVC.H, pColor_in_out, (XcmsRGBi *)&rgb_saved) == XcmsFailure) { return (XcmsFailure); } /* Step 2: Convert each of the RGBi's to HVC's */ pHVC = pColor_in_out; for (nI = 0; nI < nSamples; nI++, pHVC++) { nT = (XcmsFloat) nI / (XcmsFloat) nSamples; pHVC->spec.RGBi.red = rgb_saved.red * (1.0 - nT) + nT; pHVC->spec.RGBi.green = rgb_saved.green * (1.0 - nT) + nT; pHVC->spec.RGBi.blue = rgb_saved.blue * (1.0 - nT) + nT; pHVC->format = XcmsRGBiFormat; pHVC->pixel = pColor_in_out->pixel; /* convert from RGB to HVC */ if (_XcmsConvertColorsWithWhitePt(&myCCC, pHVC, &myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat, (Bool *) NULL) == XcmsFailure) { return(XcmsFailure); } /* make sure to return the input hue */ pHVC->spec.TekHVC.H = hue; } return(XcmsSuccess); }