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Diffstat (limited to 'src/xcms/HVCMxVs.c')
| -rw-r--r-- | src/xcms/HVCMxVs.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/xcms/HVCMxVs.c b/src/xcms/HVCMxVs.c new file mode 100644 index 00000000..33f84b61 --- /dev/null +++ b/src/xcms/HVCMxVs.c @@ -0,0 +1,166 @@ +/* $Xorg: HVCMxVs.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 + * TekHVCMxVs.c + * + * DESCRIPTION + * Source for the XcmsTekHVCQueryMaxVSamples() gamut boundary + * querying routine. + */ + +#include "Xlibint.h" +#include "Xcmsint.h" + +/* + * EXTERNS + */ +extern Status _XcmsTekHVCQueryMaxVCRGB(); +extern Status _XcmsTekHVC_CheckModify(); +extern XcmsColorSpace XcmsTekHVCColorSpace; + + + +/************************************************************************ + * * + * PUBLIC ROUTINES * + * * + ************************************************************************/ + +/* + * NAME + * XcmsTekHVCQueryMaxVSamples - Compute a set of value/chroma + * pairs. + * + * SYNOPSIS + */ +Status +XcmsTekHVCQueryMaxVSamples(ccc, hue, pColor_in_out, nSamples) + 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); +} |