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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Tone mapping functions. |
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* See tonemap.h for detailed function descriptions. |
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* Added von Kries white-balance calculations 10/01 (GW). |
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* |
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* Externals declared in tonemap.h |
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*/ |
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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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|
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#include <stdio.h> |
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#include <math.h> |
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#include "tmprivat.h" |
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#include "tmerrmsg.h" |
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|
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#define exp10(x) exp(M_LN10*(x)) |
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|
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struct tmStruct *tmTop = NULL; /* current tone mapping stack */ |
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|
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/* our list of conversion packages */ |
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struct tmPackage *tmPkg[TM_MAXPKG]; |
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int tmNumPkgs = 0; /* number of registered packages */ |
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|
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int tmLastError; /* last error incurred by library */ |
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char *tmLastFunction; /* error-generating function name */ |
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|
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|
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struct tmStruct * |
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tmInit(flags, monpri, gamval) /* initialize new tone mapping */ |
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int flags; |
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RGBPRIMP monpri; |
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double gamval; |
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{ |
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COLORMAT cmat; |
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register struct tmStruct *tmnew; |
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register int i; |
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/* allocate structure */ |
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tmnew = (struct tmStruct *)malloc(sizeof(struct tmStruct)); |
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if (tmnew == NULL) |
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return(NULL); |
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|
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tmnew->flags = flags & ~TM_F_UNIMPL; |
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/* set monitor transform */ |
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if (monpri == NULL || monpri == stdprims || tmnew->flags & TM_F_BW) { |
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tmnew->monpri = stdprims; |
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tmnew->clf[RED] = rgb2xyzmat[1][0]; |
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tmnew->clf[GRN] = rgb2xyzmat[1][1]; |
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tmnew->clf[BLU] = rgb2xyzmat[1][2]; |
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} else { |
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comprgb2xyzWBmat(cmat, tmnew->monpri=monpri); |
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tmnew->clf[RED] = cmat[1][0]; |
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tmnew->clf[GRN] = cmat[1][1]; |
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tmnew->clf[BLU] = cmat[1][2]; |
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} |
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/* set gamma value */ |
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if (gamval < MINGAM) |
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tmnew->mongam = DEFGAM; |
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else |
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tmnew->mongam = gamval; |
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/* set color divisors */ |
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for (i = 0; i < 3; i++) |
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tmnew->cdiv[i] = 256.*pow(tmnew->clf[i], 1./tmnew->mongam); |
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|
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/* set input transform */ |
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tmnew->inppri = tmnew->monpri; |
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tmnew->cmat[0][0] = tmnew->cmat[1][1] = tmnew->cmat[2][2] = |
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tmnew->inpsf = WHTEFFICACY; |
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tmnew->cmat[0][1] = tmnew->cmat[0][2] = tmnew->cmat[1][0] = |
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tmnew->cmat[1][2] = tmnew->cmat[2][0] = tmnew->cmat[2][1] = 0.; |
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tmnew->hbrmin = 10; tmnew->hbrmax = -10; |
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tmnew->histo = NULL; |
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tmnew->mbrmin = 10; tmnew->mbrmax = -10; |
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tmnew->lumap = NULL; |
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/* zero private data */ |
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for (i = TM_MAXPKG; i--; ) |
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tmnew->pd[i] = NULL; |
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/* make tmnew current */ |
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tmnew->tmprev = tmTop; |
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return(tmTop = tmnew); |
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} |
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|
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|
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int |
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tmSetSpace(pri, sf) /* set input color space for conversions */ |
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RGBPRIMP pri; |
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double sf; |
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{ |
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static char funcName[] = "tmSetSpace"; |
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register int i, j; |
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/* error check */ |
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if (tmTop == NULL) |
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returnErr(TM_E_TMINVAL); |
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if (sf <= 1e-12) |
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returnErr(TM_E_ILLEGAL); |
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/* check if no change */ |
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if (pri == tmTop->inppri && FEQ(sf, tmTop->inpsf)) |
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returnOK; |
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tmTop->inppri = pri; /* let's set it */ |
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tmTop->inpsf = sf; |
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|
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if (tmTop->flags & TM_F_BW) { /* color doesn't matter */ |
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tmTop->monpri = tmTop->inppri; /* eliminate xform */ |
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if (tmTop->inppri == TM_XYZPRIM) { |
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tmTop->clf[CIEX] = tmTop->clf[CIEZ] = 0.; |
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tmTop->clf[CIEY] = 1.; |
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} else { |
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comprgb2xyzWBmat(tmTop->cmat, tmTop->monpri); |
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tmTop->clf[RED] = tmTop->cmat[1][0]; |
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tmTop->clf[GRN] = tmTop->cmat[1][1]; |
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tmTop->clf[BLU] = tmTop->cmat[1][2]; |
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} |
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tmTop->cmat[0][0] = tmTop->cmat[1][1] = tmTop->cmat[2][2] = |
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tmTop->inpsf; |
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tmTop->cmat[0][1] = tmTop->cmat[0][2] = tmTop->cmat[1][0] = |
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tmTop->cmat[1][2] = tmTop->cmat[2][0] = tmTop->cmat[2][1] = 0.; |
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|
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} else if (tmTop->inppri == TM_XYZPRIM) /* input is XYZ */ |
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compxyz2rgbWBmat(tmTop->cmat, tmTop->monpri); |
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|
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else { /* input is RGB */ |
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if (tmTop->inppri != tmTop->monpri && |
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PRIMEQ(tmTop->inppri, tmTop->monpri)) |
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tmTop->inppri = tmTop->monpri; /* no xform */ |
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comprgb2rgbWBmat(tmTop->cmat, tmTop->inppri, tmTop->monpri); |
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} |
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for (i = 0; i < 3; i++) |
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for (j = 0; j < 3; j++) |
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tmTop->cmat[i][j] *= tmTop->inpsf; |
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/* set color divisors */ |
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for (i = 0; i < 3; i++) |
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if (tmTop->clf[i] > .001) |
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tmTop->cdiv[i] = |
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256.*pow(tmTop->clf[i], 1./tmTop->mongam); |
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else |
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tmTop->cdiv[i] = 1; |
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/* notify packages */ |
195 |
for (i = tmNumPkgs; i--; ) |
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if (tmTop->pd[i] != NULL && tmPkg[i]->NewSpace != NULL) |
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(*tmPkg[i]->NewSpace)(tmTop); |
198 |
returnOK; |
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} |
200 |
|
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|
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void |
203 |
tmClearHisto() /* clear current histogram */ |
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{ |
205 |
if (tmTop == NULL || tmTop->histo == NULL) |
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return; |
207 |
free((MEM_PTR)tmTop->histo); |
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tmTop->histo = NULL; |
209 |
} |
210 |
|
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|
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int |
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tmCvColors(ls, cs, scan, len) /* convert float colors */ |
214 |
TMbright *ls; |
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BYTE *cs; |
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COLOR *scan; |
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int len; |
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{ |
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static char funcName[] = "tmCvColors"; |
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static COLOR csmall = {1e-6, 1e-6, 1e-6}; |
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COLOR cmon; |
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double lum, slum; |
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register double d; |
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register int i; |
225 |
|
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if (tmTop == NULL) |
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returnErr(TM_E_TMINVAL); |
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if (ls == NULL | scan == NULL | len < 0) |
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returnErr(TM_E_ILLEGAL); |
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for (i = len; i--; ) { |
231 |
if (tmNeedMatrix(tmTop)) /* get monitor RGB */ |
232 |
colortrans(cmon, tmTop->cmat, scan[i]); |
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else { |
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cmon[RED] = tmTop->inpsf*scan[i][RED]; |
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cmon[GRN] = tmTop->inpsf*scan[i][GRN]; |
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cmon[BLU] = tmTop->inpsf*scan[i][BLU]; |
237 |
} |
238 |
/* world luminance */ |
239 |
lum = tmTop->clf[RED]*cmon[RED] + |
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tmTop->clf[GRN]*cmon[GRN] + |
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tmTop->clf[BLU]*cmon[BLU] ; |
242 |
/* check range */ |
243 |
if (clipgamut(cmon, lum, CGAMUT_LOWER, csmall, cwhite)) |
244 |
lum = tmTop->clf[RED]*cmon[RED] + |
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tmTop->clf[GRN]*cmon[GRN] + |
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tmTop->clf[BLU]*cmon[BLU] ; |
247 |
if (lum < MINLUM) { |
248 |
ls[i] = MINBRT-1; /* bogus value */ |
249 |
lum = MINLUM; |
250 |
} else { |
251 |
d = TM_BRTSCALE*log(lum); /* encode it */ |
252 |
ls[i] = d>0. ? (int)(d+.5) : (int)(d-.5); |
253 |
} |
254 |
if (cs == TM_NOCHROM) /* no color? */ |
255 |
continue; |
256 |
if (tmTop->flags & TM_F_MESOPIC && lum < LMESUPPER) { |
257 |
slum = scotlum(cmon); /* mesopic adj. */ |
258 |
if (lum < LMESLOWER) |
259 |
cmon[RED] = cmon[GRN] = cmon[BLU] = slum; |
260 |
else { |
261 |
d = (lum - LMESLOWER)/(LMESUPPER - LMESLOWER); |
262 |
if (tmTop->flags & TM_F_BW) |
263 |
cmon[RED] = cmon[GRN] = |
264 |
cmon[BLU] = d*lum; |
265 |
else |
266 |
scalecolor(cmon, d); |
267 |
d = (1.-d)*slum; |
268 |
cmon[RED] += d; |
269 |
cmon[GRN] += d; |
270 |
cmon[BLU] += d; |
271 |
} |
272 |
} else if (tmTop->flags & TM_F_BW) { |
273 |
cmon[RED] = cmon[GRN] = cmon[BLU] = lum; |
274 |
} |
275 |
d = tmTop->clf[RED]*cmon[RED]/lum; |
276 |
cs[3*i ] = d>=.999 ? 255 : |
277 |
(int)(256.*pow(d, 1./tmTop->mongam)); |
278 |
d = tmTop->clf[GRN]*cmon[GRN]/lum; |
279 |
cs[3*i+1] = d>=.999 ? 255 : |
280 |
(int)(256.*pow(d, 1./tmTop->mongam)); |
281 |
d = tmTop->clf[BLU]*cmon[BLU]/lum; |
282 |
cs[3*i+2] = d>=.999 ? 255 : |
283 |
(int)(256.*pow(d, 1./tmTop->mongam)); |
284 |
} |
285 |
returnOK; |
286 |
} |
287 |
|
288 |
|
289 |
int |
290 |
tmCvGrays(ls, scan, len) /* convert float gray values */ |
291 |
TMbright *ls; |
292 |
float *scan; |
293 |
int len; |
294 |
{ |
295 |
static char funcName[] = "tmCvGrays"; |
296 |
register double d; |
297 |
register int i; |
298 |
|
299 |
if (tmTop == NULL) |
300 |
returnErr(TM_E_TMINVAL); |
301 |
if (ls == NULL | scan == NULL | len < 0) |
302 |
returnErr(TM_E_ILLEGAL); |
303 |
for (i = len; i--; ) |
304 |
if (scan[i] <= TM_NOLUM) { |
305 |
ls[i] = TM_NOBRT; /* bogus value */ |
306 |
} else { |
307 |
d = TM_BRTSCALE*log(scan[i]); /* encode it */ |
308 |
ls[i] = d>0. ? (int)(d+.5) : (int)(d-.5); |
309 |
} |
310 |
returnOK; |
311 |
} |
312 |
|
313 |
|
314 |
int |
315 |
tmAddHisto(ls, len, wt) /* add values to histogram */ |
316 |
register TMbright *ls; |
317 |
int len; |
318 |
int wt; |
319 |
{ |
320 |
static char funcName[] = "tmAddHisto"; |
321 |
int oldorig=0, oldlen, horig, hlen; |
322 |
register int i, j; |
323 |
|
324 |
if (tmTop == NULL) |
325 |
returnErr(TM_E_TMINVAL); |
326 |
if (len < 0) |
327 |
returnErr(TM_E_ILLEGAL); |
328 |
if (len == 0) |
329 |
returnOK; |
330 |
/* first, grow limits */ |
331 |
if (tmTop->histo == NULL) { |
332 |
for (i = len; i-- && ls[i] < MINBRT; ) |
333 |
; |
334 |
if (i < 0) |
335 |
returnOK; |
336 |
tmTop->hbrmin = tmTop->hbrmax = ls[i]; |
337 |
oldlen = 0; |
338 |
} else { |
339 |
oldorig = (tmTop->hbrmin-MINBRT)/HISTEP; |
340 |
oldlen = (tmTop->hbrmax-MINBRT)/HISTEP + 1 - oldorig; |
341 |
} |
342 |
for (i = len; i--; ) { |
343 |
if ((j = ls[i]) < MINBRT) |
344 |
continue; |
345 |
if (j < tmTop->hbrmin) |
346 |
tmTop->hbrmin = j; |
347 |
else if (j > tmTop->hbrmax) |
348 |
tmTop->hbrmax = j; |
349 |
} |
350 |
horig = (tmTop->hbrmin-MINBRT)/HISTEP; |
351 |
hlen = (tmTop->hbrmax-MINBRT)/HISTEP + 1 - horig; |
352 |
if (hlen > oldlen) { /* (re)allocate histogram */ |
353 |
register int *newhist = (int *)calloc(hlen, sizeof(int)); |
354 |
if (newhist == NULL) |
355 |
returnErr(TM_E_NOMEM); |
356 |
if (oldlen) { /* copy and free old */ |
357 |
for (i = oldlen, j = i+oldorig-horig; i; ) |
358 |
newhist[--j] = tmTop->histo[--i]; |
359 |
free((MEM_PTR)tmTop->histo); |
360 |
} |
361 |
tmTop->histo = newhist; |
362 |
} |
363 |
if (wt == 0) |
364 |
returnOK; |
365 |
for (i = len; i--; ) /* add in new counts */ |
366 |
if (ls[i] >= MINBRT) |
367 |
tmTop->histo[ (ls[i]-MINBRT)/HISTEP - horig ] += wt; |
368 |
returnOK; |
369 |
} |
370 |
|
371 |
|
372 |
static double |
373 |
htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
374 |
double La; |
375 |
{ |
376 |
double l10La, l10dL; |
377 |
/* formula taken from Ferwerda et al. [SG96] */ |
378 |
if (La < 1.148e-4) |
379 |
return(1.38e-3); |
380 |
l10La = log10(La); |
381 |
if (l10La < -1.44) /* rod response regime */ |
382 |
l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86; |
383 |
else if (l10La < -.0184) |
384 |
l10dL = l10La - .395; |
385 |
else if (l10La < 1.9) /* cone response regime */ |
386 |
l10dL = pow(.249*l10La + .65, 2.7) - .72; |
387 |
else |
388 |
l10dL = l10La - 1.255; |
389 |
|
390 |
return(exp10(l10dL)); |
391 |
} |
392 |
|
393 |
|
394 |
static int |
395 |
tmNewMap() |
396 |
{ |
397 |
if (tmTop->lumap != NULL && (tmTop->mbrmax - tmTop->mbrmin) != |
398 |
(tmTop->hbrmax - tmTop->hbrmin)) { |
399 |
free((MEM_PTR)tmTop->lumap); |
400 |
tmTop->lumap = NULL; |
401 |
} |
402 |
tmTop->mbrmin = tmTop->hbrmin; |
403 |
tmTop->mbrmax = tmTop->hbrmax; |
404 |
if (tmTop->mbrmin > tmTop->mbrmax) |
405 |
return 0; |
406 |
if (tmTop->lumap == NULL) |
407 |
tmTop->lumap = (unsigned short *)malloc(sizeof(unsigned short)* |
408 |
(tmTop->mbrmax-tmTop->mbrmin+1)); |
409 |
return(tmTop->lumap != NULL); |
410 |
} |
411 |
|
412 |
|
413 |
int |
414 |
tmFixedMapping(expmult, gamval) |
415 |
double expmult; |
416 |
double gamval; |
417 |
{ |
418 |
static char funcName[] = "tmFixedMapping"; |
419 |
double d; |
420 |
register int i; |
421 |
|
422 |
if (!tmNewMap()) |
423 |
returnErr(TM_E_NOMEM); |
424 |
if (expmult <= .0) |
425 |
expmult = 1.; |
426 |
if (gamval < MINGAM) |
427 |
gamval = tmTop->mongam; |
428 |
d = log(expmult/tmTop->inpsf); |
429 |
for (i = tmTop->mbrmax-tmTop->mbrmin+1; i--; ) |
430 |
tmTop->lumap[i] = 256. * exp( |
431 |
( d + (tmTop->mbrmin+i)*(1./TM_BRTSCALE) ) |
432 |
/ gamval ); |
433 |
returnOK; |
434 |
} |
435 |
|
436 |
|
437 |
int |
438 |
tmComputeMapping(gamval, Lddyn, Ldmax) |
439 |
double gamval; |
440 |
double Lddyn; |
441 |
double Ldmax; |
442 |
{ |
443 |
static char funcName[] = "tmComputeMapping"; |
444 |
int *histo; |
445 |
float *cumf; |
446 |
int brt0, histlen, threshold, ceiling, trimmings; |
447 |
double logLddyn, Ldmin, Ldavg, Lwavg, Tr, Lw, Ld; |
448 |
int4 histot; |
449 |
double sum; |
450 |
register double d; |
451 |
register int i, j; |
452 |
|
453 |
if (tmTop == NULL || tmTop->histo == NULL) |
454 |
returnErr(TM_E_TMINVAL); |
455 |
/* check arguments */ |
456 |
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
457 |
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
458 |
if (gamval < MINGAM) gamval = tmTop->mongam; |
459 |
/* compute handy values */ |
460 |
Ldmin = Ldmax/Lddyn; |
461 |
logLddyn = log(Lddyn); |
462 |
Ldavg = sqrt(Ldmax*Ldmin); |
463 |
i = (tmTop->hbrmin-MINBRT)/HISTEP; |
464 |
brt0 = MINBRT + HISTEP/2 + i*HISTEP; |
465 |
histlen = (tmTop->hbrmax-MINBRT)/HISTEP + 1 - i; |
466 |
/* histogram total and mean */ |
467 |
histot = 0; sum = 0; |
468 |
j = brt0 + histlen*HISTEP; |
469 |
for (i = histlen; i--; ) { |
470 |
histot += tmTop->histo[i]; |
471 |
sum += (j -= HISTEP) * tmTop->histo[i]; |
472 |
} |
473 |
threshold = histot*.025 + .5; |
474 |
if (threshold < 4) |
475 |
returnErr(TM_E_TMFAIL); |
476 |
Lwavg = tmLuminance( (double)sum / histot ); |
477 |
/* allocate space for mapping */ |
478 |
if (!tmNewMap()) |
479 |
returnErr(TM_E_NOMEM); |
480 |
/* use linear tone mapping? */ |
481 |
if (tmTop->flags & TM_F_LINEAR) |
482 |
goto linearmap; |
483 |
/* clamp histogram */ |
484 |
histo = (int *)malloc(histlen*sizeof(int)); |
485 |
cumf = (float *)malloc((histlen+2)*sizeof(float)); |
486 |
if (histo == NULL | cumf == NULL) |
487 |
returnErr(TM_E_NOMEM); |
488 |
cumf[histlen+1] = 1.; /* guard for assignment code */ |
489 |
for (i = histlen; i--; ) /* make malleable copy */ |
490 |
histo[i] = tmTop->histo[i]; |
491 |
do { /* iterate to solution */ |
492 |
sum = 0; /* cumulative probability */ |
493 |
for (i = 0; i < histlen; i++) { |
494 |
cumf[i] = (double)sum/histot; |
495 |
sum += histo[i]; |
496 |
} |
497 |
cumf[histlen] = 1.; |
498 |
Tr = histot * (double)(tmTop->hbrmax - tmTop->hbrmin) / |
499 |
((double)histlen*TM_BRTSCALE) / logLddyn; |
500 |
ceiling = Tr + 1.; |
501 |
trimmings = 0; /* clip to envelope */ |
502 |
for (i = histlen; i--; ) { |
503 |
if (tmTop->flags & TM_F_HCONTR) { |
504 |
Lw = tmLuminance(brt0 + i*HISTEP); |
505 |
Ld = Ldmin * exp( logLddyn * |
506 |
.5*(cumf[i]+cumf[i+1]) ); |
507 |
ceiling = Tr * (htcontrs(Ld) * Lw) / |
508 |
(htcontrs(Lw) * Ld) + 1.; |
509 |
} |
510 |
if (histo[i] > ceiling) { |
511 |
trimmings += histo[i] - ceiling; |
512 |
histo[i] = ceiling; |
513 |
} |
514 |
} |
515 |
/* check if we're out of data */ |
516 |
if ((histot -= trimmings) <= threshold) { |
517 |
free((MEM_PTR)histo); |
518 |
free((MEM_PTR)cumf); |
519 |
goto linearmap; |
520 |
} |
521 |
} while (trimmings > threshold); |
522 |
/* assign tone-mapping */ |
523 |
for (i = tmTop->mbrmax-tmTop->mbrmin+1; i--; ) { |
524 |
j = d = (double)i/(tmTop->mbrmax-tmTop->mbrmin)*histlen; |
525 |
d -= (double)j; |
526 |
Ld = Ldmin*exp(logLddyn*((1.-d)*cumf[j]+d*cumf[j+1])); |
527 |
d = (Ld - Ldmin)/(Ldmax - Ldmin); |
528 |
tmTop->lumap[i] = 256.*pow(d, 1./gamval); |
529 |
} |
530 |
free((MEM_PTR)histo); /* clean up and return */ |
531 |
free((MEM_PTR)cumf); |
532 |
returnOK; |
533 |
linearmap: /* linear tone-mapping */ |
534 |
if (tmTop->flags & TM_F_HCONTR) |
535 |
d = htcontrs(Ldavg) / htcontrs(Lwavg); |
536 |
else |
537 |
d = Ldavg / Lwavg; |
538 |
return(tmFixedMapping(tmTop->inpsf*d/Ldmax, gamval)); |
539 |
} |
540 |
|
541 |
|
542 |
int |
543 |
tmMapPixels(ps, ls, cs, len) |
544 |
register BYTE *ps; |
545 |
TMbright *ls; |
546 |
register BYTE *cs; |
547 |
int len; |
548 |
{ |
549 |
static char funcName[] = "tmMapPixels"; |
550 |
register int4 li, pv; |
551 |
|
552 |
if (tmTop == NULL || tmTop->lumap == NULL) |
553 |
returnErr(TM_E_TMINVAL); |
554 |
if (ps == NULL | ls == NULL | len < 0) |
555 |
returnErr(TM_E_ILLEGAL); |
556 |
while (len--) { |
557 |
if ((li = *ls++) < tmTop->mbrmin) { |
558 |
li = 0; |
559 |
} else { |
560 |
if (li > tmTop->mbrmax) |
561 |
li = tmTop->mbrmax; |
562 |
li = tmTop->lumap[li - tmTop->mbrmin]; |
563 |
} |
564 |
if (cs == TM_NOCHROM) |
565 |
*ps++ = li>255 ? 255 : li; |
566 |
else { |
567 |
pv = *cs++ * li / tmTop->cdiv[RED]; |
568 |
*ps++ = pv>255 ? 255 : pv; |
569 |
pv = *cs++ * li / tmTop->cdiv[GRN]; |
570 |
*ps++ = pv>255 ? 255 : pv; |
571 |
pv = *cs++ * li / tmTop->cdiv[BLU]; |
572 |
*ps++ = pv>255 ? 255 : pv; |
573 |
} |
574 |
} |
575 |
returnOK; |
576 |
} |
577 |
|
578 |
|
579 |
struct tmStruct * |
580 |
tmPop() /* pop top tone mapping off stack */ |
581 |
{ |
582 |
register struct tmStruct *tms; |
583 |
|
584 |
if ((tms = tmTop) != NULL) |
585 |
tmTop = tms->tmprev; |
586 |
return(tms); |
587 |
} |
588 |
|
589 |
|
590 |
int |
591 |
tmPull(tms) /* pull a tone mapping from stack */ |
592 |
register struct tmStruct *tms; |
593 |
{ |
594 |
register struct tmStruct *tms2; |
595 |
/* special cases first */ |
596 |
if (tms == NULL | tmTop == NULL) |
597 |
return(0); |
598 |
if (tms == tmTop) { |
599 |
tmTop = tms->tmprev; |
600 |
tms->tmprev = NULL; |
601 |
return(1); |
602 |
} |
603 |
for (tms2 = tmTop; tms2->tmprev != NULL; tms2 = tms2->tmprev) |
604 |
if (tms == tms2->tmprev) { /* remove it */ |
605 |
tms2->tmprev = tms->tmprev; |
606 |
tms->tmprev = NULL; |
607 |
return(1); |
608 |
} |
609 |
return(0); /* not found on stack */ |
610 |
} |
611 |
|
612 |
|
613 |
struct tmStruct * |
614 |
tmDup() /* duplicate top tone mapping */ |
615 |
{ |
616 |
int len; |
617 |
register int i; |
618 |
register struct tmStruct *tmnew; |
619 |
|
620 |
if (tmTop == NULL) /* anything to duplicate? */ |
621 |
return(NULL); |
622 |
tmnew = (struct tmStruct *)malloc(sizeof(struct tmStruct)); |
623 |
if (tmnew == NULL) |
624 |
return(NULL); |
625 |
*tmnew = *tmTop; /* copy everything */ |
626 |
if (tmnew->histo != NULL) { /* duplicate histogram */ |
627 |
len = (tmnew->hbrmax-MINBRT)/HISTEP + 1 - |
628 |
(tmnew->hbrmin-MINBRT)/HISTEP; |
629 |
tmnew->histo = (int *)malloc(len*sizeof(int)); |
630 |
if (tmnew->histo != NULL) |
631 |
for (i = len; i--; ) |
632 |
tmnew->histo[i] = tmTop->histo[i]; |
633 |
} |
634 |
if (tmnew->lumap != NULL) { /* duplicate luminance mapping */ |
635 |
len = tmnew->mbrmax-tmnew->mbrmin+1; |
636 |
tmnew->lumap = (unsigned short *)malloc( |
637 |
len*sizeof(unsigned short) ); |
638 |
if (tmnew->lumap != NULL) |
639 |
for (i = len; i--; ) |
640 |
tmnew->lumap[i] = tmTop->lumap[i]; |
641 |
} |
642 |
/* clear package data */ |
643 |
for (i = tmNumPkgs; i--; ) |
644 |
tmnew->pd[i] = NULL; |
645 |
tmnew->tmprev = tmTop; /* make copy current */ |
646 |
return(tmTop = tmnew); |
647 |
} |
648 |
|
649 |
|
650 |
int |
651 |
tmPush(tms) /* push tone mapping on top of stack */ |
652 |
register struct tmStruct *tms; |
653 |
{ |
654 |
static char funcName[] = "tmPush"; |
655 |
/* check validity */ |
656 |
if (tms == NULL) |
657 |
returnErr(TM_E_ILLEGAL); |
658 |
if (tms == tmTop) /* check necessity */ |
659 |
returnOK; |
660 |
/* pull if already in stack */ |
661 |
(void)tmPull(tms); |
662 |
/* push it on top */ |
663 |
tms->tmprev = tmTop; |
664 |
tmTop = tms; |
665 |
returnOK; |
666 |
} |
667 |
|
668 |
|
669 |
void |
670 |
tmDone(tms) /* done with tone mapping -- destroy it */ |
671 |
register struct tmStruct *tms; |
672 |
{ |
673 |
register int i; |
674 |
/* NULL arg. is equiv. to tmTop */ |
675 |
if (tms == NULL && (tms = tmTop) == NULL) |
676 |
return; |
677 |
/* take out of stack if present */ |
678 |
(void)tmPull(tms); |
679 |
/* free tables */ |
680 |
if (tms->histo != NULL) |
681 |
free((MEM_PTR)tms->histo); |
682 |
if (tms->lumap != NULL) |
683 |
free((MEM_PTR)tms->lumap); |
684 |
/* free private data */ |
685 |
for (i = tmNumPkgs; i--; ) |
686 |
if (tms->pd[i] != NULL) |
687 |
(*tmPkg[i]->Free)(tms->pd[i]); |
688 |
free((MEM_PTR)tms); /* free basic structure */ |
689 |
} |
690 |
|
691 |
/******************** Shared but Private library routines *********************/ |
692 |
|
693 |
BYTE tmMesofact[BMESUPPER-BMESLOWER]; |
694 |
|
695 |
void |
696 |
tmMkMesofact() /* build mesopic lookup factor table */ |
697 |
{ |
698 |
register int i; |
699 |
|
700 |
if (tmMesofact[BMESUPPER-BMESLOWER-1]) |
701 |
return; |
702 |
|
703 |
for (i = BMESLOWER; i < BMESUPPER; i++) |
704 |
tmMesofact[i-BMESLOWER] = 256. * |
705 |
(tmLuminance(i) - LMESLOWER) / |
706 |
(LMESUPPER - LMESLOWER); |
707 |
} |
708 |
|
709 |
|
710 |
int |
711 |
tmErrorReturn(func, err) /* error return (with message) */ |
712 |
char *func; |
713 |
int err; |
714 |
{ |
715 |
tmLastFunction = func; |
716 |
tmLastError = err; |
717 |
if (tmTop != NULL && tmTop->flags & TM_F_NOSTDERR) |
718 |
return(err); |
719 |
fputs(func, stderr); |
720 |
fputs(": ", stderr); |
721 |
fputs(tmErrorMessage[err], stderr); |
722 |
fputs("!\n", stderr); |
723 |
return(err); |
724 |
} |