161 lines
5 KiB
C
161 lines
5 KiB
C
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/*
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* Code and supporting documentation (c) Copyright 1990 1991 Tektronix, Inc.
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* All Rights Reserved
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*
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* This file is a component of an X Window System-specific implementation
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* of Xcms based on the TekColor Color Management System. TekColor is a
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* trademark of Tektronix, Inc. The term "TekHVC" designates a particular
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* color space that is the subject of U.S. Patent No. 4,985,853 (equivalent
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* foreign patents pending). Permission is hereby granted to use, copy,
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* modify, sell, and otherwise distribute this software and its
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* documentation for any purpose and without fee, provided that:
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*
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* 1. This copyright, permission, and disclaimer notice is reproduced in
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* all copies of this software and any modification thereof and in
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* supporting documentation;
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* 2. Any color-handling application which displays TekHVC color
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* cooordinates identifies these as TekHVC color coordinates in any
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* interface that displays these coordinates and in any associated
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* documentation;
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* 3. The term "TekHVC" is always used, and is only used, in association
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* with the mathematical derivations of the TekHVC Color Space,
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* including those provided in this file and any equivalent pathways and
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* mathematical derivations, regardless of digital (e.g., floating point
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* or integer) representation.
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*
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* Tektronix makes no representation about the suitability of this software
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* for any purpose. It is provided "as is" and with all faults.
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*
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* TEKTRONIX DISCLAIMS ALL WARRANTIES APPLICABLE TO THIS SOFTWARE,
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* INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE. IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR THE PERFORMANCE OF THIS SOFTWARE.
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*
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* NAME
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* TekHVCMxVs.c
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*
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* DESCRIPTION
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* Source for the XcmsTekHVCQueryMaxVSamples() gamut boundary
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* querying routine.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "Xlibint.h"
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#include "Xcmsint.h"
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#include "Cv.h"
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/************************************************************************
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* *
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* PUBLIC ROUTINES *
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* *
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************************************************************************/
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/*
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* NAME
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* XcmsTekHVCQueryMaxVSamples - Compute a set of value/chroma
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* pairs.
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*
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* SYNOPSIS
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*/
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Status
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XcmsTekHVCQueryMaxVSamples(
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XcmsCCC ccc,
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XcmsFloat hue,
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XcmsColor *pColor_in_out,
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unsigned int nSamples)
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/*
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* DESCRIPTION
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* Return a set of values and chromas for the input Hue.
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* This routine will take any color as input.
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* It returns TekHVC colors.
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*
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* Since this routine works with the value within
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* pColor_in_out intermediate results may be returned
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* even though it may be invalid.
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*
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* ASSUMPTIONS
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* This routine assumes that the white point associated with
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* the color specification is the Screen White Point. The
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* Screen White Point will also be associated with the
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* returned color specification.
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*
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* RETURNS
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* XcmsFailure - Failure
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* XcmsSuccess - Succeeded
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*
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*/
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{
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XcmsCCCRec myCCC;
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XcmsColor *pHVC;
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XcmsRGBi rgb_saved;
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unsigned short nI;
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XcmsFloat nT;
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/*
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* Check Arguments
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*/
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if (ccc == NULL || pColor_in_out == NULL || nSamples == 0) {
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return(XcmsFailure);
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}
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/*
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* Insure TekHVC installed
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*/
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if (XcmsAddColorSpace(&XcmsTekHVCColorSpace) == XcmsFailure) {
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return(XcmsFailure);
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}
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/* setup the CCC to use for the conversions. */
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memcpy ((char *) &myCCC, (char *) ccc, sizeof(XcmsCCCRec));
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myCCC.clientWhitePt.format = XcmsUndefinedFormat;
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myCCC.gamutCompProc = (XcmsCompressionProc) NULL;
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/* Step 1: compute the maximum value and chroma for this hue. */
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/* save the Hue for use later. */
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while (hue < 0.0) {
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hue += 360.0;
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}
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while (hue > 360.0) {
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hue -= 360.0;
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}
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pColor_in_out->spec.TekHVC.H = hue;
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pColor_in_out->format = XcmsTekHVCFormat;
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/* Get the maximum value and chroma point for this hue */
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if (_XcmsTekHVCQueryMaxVCRGB(&myCCC, pColor_in_out->spec.TekHVC.H,
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pColor_in_out, (XcmsRGBi *)&rgb_saved) == XcmsFailure) {
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return (XcmsFailure);
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}
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/* Step 2: Convert each of the RGBi's to HVC's */
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pHVC = pColor_in_out;
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for (nI = 0; nI < nSamples; nI++, pHVC++) {
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nT = (XcmsFloat) nI / (XcmsFloat) nSamples;
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pHVC->spec.RGBi.red = rgb_saved.red * (1.0 - nT) + nT;
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pHVC->spec.RGBi.green = rgb_saved.green * (1.0 - nT) + nT;
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pHVC->spec.RGBi.blue = rgb_saved.blue * (1.0 - nT) + nT;
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pHVC->format = XcmsRGBiFormat;
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pHVC->pixel = pColor_in_out->pixel;
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/* convert from RGB to HVC */
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if (_XcmsConvertColorsWithWhitePt(&myCCC, pHVC,
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&myCCC.pPerScrnInfo->screenWhitePt, 1, XcmsTekHVCFormat,
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(Bool *) NULL) == XcmsFailure) {
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return(XcmsFailure);
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}
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/* make sure to return the input hue */
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pHVC->spec.TekHVC.H = hue;
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}
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return(XcmsSuccess);
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}
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