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-
-/*
- * 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);
-}