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#ifndef lint
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static const char RCSid[] = "$Id: tonemap.c,v 3.55 2024/11/21 17:15:54 greg Exp $";
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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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#include "copyright.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include "tmprivat.h"
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#include "tmerrmsg.h"
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#define exp10(x) exp(M_LN10*(x))
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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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/* luminance->brightness lookup */
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static TMbright *tmFloat2BrtLUT = NULL;
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#define tmCvLumLUfp(pf) tmFloat2BrtLUT[*(int32 *)(pf) >> 15]
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TMstruct *
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tmInit( /* 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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{
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COLORMAT cmat;
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TMstruct *tmnew;
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int i;
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/* allocate structure */
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tmnew = (TMstruct *)malloc(sizeof(TMstruct));
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if (tmnew == NULL)
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return(NULL);
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tmnew->flags = flags & ~TM_F_UNIMPL;
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if (tmnew->flags & TM_F_BW)
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tmnew->flags &= ~TM_F_MESOPIC;
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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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comprgb2xyzmat(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] = TM_BRES*pow(tmnew->clf[i], 1./tmnew->mongam);
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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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tmnew->lastError = TM_E_OK;
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tmnew->lastFunc = "NoErr";
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/* return new TMstruct */
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return(tmnew);
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}
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int
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tmSetSpace( /* set input color space for conversions */
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TMstruct *tms,
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RGBPRIMP pri,
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double sf
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)
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{
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static const char funcName[] = "tmSetSpace";
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int i, j;
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/* error check */
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if (tms == 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 == tms->inppri && FEQ(sf, tms->inpsf))
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returnOK;
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tms->inppri = pri; /* let's set it */
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tms->inpsf = sf;
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if (tms->flags & TM_F_BW) { /* color doesn't matter */
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tms->monpri = tms->inppri; /* eliminate xform */
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if (tms->inppri == TM_XYZPRIM) {
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tms->clf[CIEX] = tms->clf[CIEZ] = 0.;
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tms->clf[CIEY] = 1.;
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} else {
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comprgb2xyzmat(tms->cmat, tms->monpri);
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tms->clf[RED] = tms->cmat[1][0];
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tms->clf[GRN] = tms->cmat[1][1];
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tms->clf[BLU] = tms->cmat[1][2];
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}
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tms->cmat[0][0] = tms->cmat[1][1] = tms->cmat[2][2] = 1.;
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tms->cmat[0][1] = tms->cmat[0][2] = tms->cmat[1][0] =
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tms->cmat[1][2] = tms->cmat[2][0] = tms->cmat[2][1] = 0.;
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} else if (tms->inppri == TM_XYZPRIM) { /* input is XYZ */
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compxyz2rgbWBmat(tms->cmat, tms->monpri);
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} else { /* input is RGB */
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if (tms->inppri != tms->monpri &&
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PRIMEQ(tms->inppri, tms->monpri))
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tms->inppri = tms->monpri; /* no xform */
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if (!comprgb2rgbWBmat(tms->cmat, tms->inppri, tms->monpri))
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returnErr(TM_E_ILLEGAL);
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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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tms->cmat[i][j] *= tms->inpsf;
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/* set color divisors */
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for (i = 0; i < 3; i++)
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tms->cdiv[i] = TM_BRES*pow(tms->clf[i] < .001 ? .001 :
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tms->clf[i], 1./tms->mongam);
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/* notify packages */
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for (i = tmNumPkgs; i--; )
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if (tms->pd[i] != NULL && tmPkg[i]->NewSpace != NULL)
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(*tmPkg[i]->NewSpace)(tms);
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returnOK;
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}
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void
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tmClearHisto( /* clear current histogram */
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TMstruct *tms
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)
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{
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if (tms == NULL || tms->histo == NULL)
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return;
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free(tms->histo);
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tms->hbrmin = 10; tms->hbrmax = -10;
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tms->histo = NULL;
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}
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TMbright
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tmCvLuminance( /* convert a single luminance */
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double lum
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)
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{
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double d;
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#ifdef isfinite
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if (!isfinite(lum) || lum <= TM_NOLUM)
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#else
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if (lum <= TM_NOLUM)
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#endif
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return(TM_NOBRT);
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d = TM_BRTSCALE*log(lum);
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return((TMbright)(d + .5 - (d < 0.)));
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}
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int
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tmCvLums( /* convert luminances using lookup */
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TMbright *ls,
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float *scan,
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int len
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)
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{
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if (tmFloat2BrtLUT == NULL) { /* initialize lookup table */
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int32 i;
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tmFloat2BrtLUT = (TMbright *)malloc(sizeof(TMbright)*0x10000);
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if (tmFloat2BrtLUT == NULL)
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return(TM_E_NOMEM);
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for (i = 0; i < 0x10000; i++) {
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int32 l = (i<<1 | 1) << 14;
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#ifndef isfinite
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if ((l & 0x7f800000) == 0x7f800000)
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tmFloat2BrtLUT[i] = TM_NOBRT;
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else
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#endif
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tmFloat2BrtLUT[i] = tmCvLuminance(*(float *)&l);
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}
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}
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if (len <= 0)
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return(TM_E_OK);
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if ((ls == NULL) | (scan == NULL))
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return(TM_E_ILLEGAL);
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while (len--) {
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if (*scan <= TM_NOLUM) {
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*ls++ = TM_NOBRT;
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++scan;
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continue;
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}
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*ls++ = tmCvLumLUfp(scan++);
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}
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return(TM_E_OK);
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}
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int
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tmCvGrays( /* convert float gray values */
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TMstruct *tms,
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TMbright *ls,
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float *scan,
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int len
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)
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{
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static const char funcName[] = "tmCvGrays";
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int i;
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if (tms == 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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if (tmFloat2BrtLUT == NULL) /* initialize */
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tmCvLums(NULL, NULL, 0);
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for (i = len; i--; ) {
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float lum = tms->inpsf * scan[i];
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if (lum <= TM_NOLUM)
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ls[i] = TM_NOBRT;
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else
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ls[i] = tmCvLumLUfp(&lum);
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}
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returnOK;
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}
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int
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tmCvColors( /* convert float colors */
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TMstruct *tms,
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TMbright *ls,
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uby8 *cs,
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COLOR *scan,
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int len
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)
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{
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static const char funcName[] = "tmCvColors";
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| 259 |
static uby8 gamtab[1024];
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static double curgam = .0;
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COLOR cmon;
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float lum, slum, d;
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| 263 |
int i;
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| 264 |
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if (tms == NULL)
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returnErr(TM_E_TMINVAL);
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| 267 |
if ((ls == NULL) | (scan == NULL) | (len < 0))
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returnErr(TM_E_ILLEGAL);
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if (tmFloat2BrtLUT == NULL) /* initialize */
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tmCvLums(NULL, NULL, 0);
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if (cs != TM_NOCHROM && fabs(tms->mongam - curgam) > .02) {
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| 272 |
curgam = tms->mongam; /* (re)build table */
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for (i = 1024; i--; )
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gamtab[i] = (int)(256.*pow((i+.5)/1024., 1./curgam));
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}
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if (cs != TM_NOCHROM && tms->flags & TM_F_BW) { /* fill B&W chroma */
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int j = 3;
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while (j--) {
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const int pv = (tms->cdiv[j]<<8)/TM_BRES;
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for (i = len; i--; )
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cs[3*i + j] = pv;
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}
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}
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for (i = len; i--; ) {
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if (tmNeedMatrix(tms)) { /* get monitor RGB */
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colortrans(cmon, tms->cmat, scan[i]);
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} else {
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cmon[RED] = tms->inpsf*scan[i][RED];
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cmon[GRN] = tms->inpsf*scan[i][GRN];
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cmon[BLU] = tms->inpsf*scan[i][BLU];
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}
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#ifdef isfinite
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if (!isfinite(cmon[RED]) || cmon[RED] < .0f) cmon[RED] = .0f;
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| 294 |
if (!isfinite(cmon[GRN]) || cmon[GRN] < .0f) cmon[GRN] = .0f;
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| 295 |
if (!isfinite(cmon[BLU]) || cmon[BLU] < .0f) cmon[BLU] = .0f;
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| 296 |
#else
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| 297 |
if (cmon[RED] < .0f) cmon[RED] = .0f;
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| 298 |
if (cmon[GRN] < .0f) cmon[GRN] = .0f;
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| 299 |
if (cmon[BLU] < .0f) cmon[BLU] = .0f;
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| 300 |
#endif /* world luminance */
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| 301 |
lum = tms->clf[RED]*cmon[RED] +
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| 302 |
tms->clf[GRN]*cmon[GRN] +
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tms->clf[BLU]*cmon[BLU] ;
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| 304 |
if (lum <= TM_NOLUM) { /* convert brightness */
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| 305 |
lum = cmon[RED] = cmon[GRN] = cmon[BLU] = TM_NOLUM;
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| 306 |
ls[i] = TM_NOBRT;
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} else
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| 308 |
ls[i] = tmCvLumLUfp(&lum);
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| 309 |
if ((cs == TM_NOCHROM) | (tms->flags & TM_F_BW))
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| 310 |
continue; /* no color */
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| 311 |
if (tms->flags & TM_F_MESOPIC && lum < LMESUPPER) {
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| 312 |
slum = scotlum(cmon); /* mesopic adj. */
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| 313 |
if (lum < LMESLOWER) {
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| 314 |
cmon[RED] = cmon[GRN] = cmon[BLU] = slum;
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| 315 |
} else {
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| 316 |
d = (lum - LMESLOWER)/(LMESUPPER - LMESLOWER);
|
| 317 |
if (tms->flags & TM_F_BW)
|
| 318 |
cmon[RED] = cmon[GRN] =
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| 319 |
cmon[BLU] = d*lum;
|
| 320 |
else
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| 321 |
scalecolor(cmon, d);
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| 322 |
d = (1.f-d)*slum;
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| 323 |
cmon[RED] += d;
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| 324 |
cmon[GRN] += d;
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| 325 |
cmon[BLU] += d;
|
| 326 |
}
|
| 327 |
}
|
| 328 |
d = tms->clf[RED]*cmon[RED]/lum;
|
| 329 |
cs[3*i ] = d>=.999f ? 255 : gamtab[(int)(1024.f*d)];
|
| 330 |
d = tms->clf[GRN]*cmon[GRN]/lum;
|
| 331 |
cs[3*i+1] = d>=.999f ? 255 : gamtab[(int)(1024.f*d)];
|
| 332 |
d = tms->clf[BLU]*cmon[BLU]/lum;
|
| 333 |
cs[3*i+2] = d>=.999f ? 255 : gamtab[(int)(1024.f*d)];
|
| 334 |
}
|
| 335 |
returnOK;
|
| 336 |
}
|
| 337 |
|
| 338 |
|
| 339 |
int
|
| 340 |
tmAddHisto( /* add values to histogram */
|
| 341 |
TMstruct *tms,
|
| 342 |
TMbright *ls,
|
| 343 |
int len,
|
| 344 |
int wt
|
| 345 |
)
|
| 346 |
{
|
| 347 |
static const char funcName[] = "tmAddHisto";
|
| 348 |
int oldorig=0, oldlen, horig, hlen;
|
| 349 |
int i;
|
| 350 |
|
| 351 |
if (tms == NULL)
|
| 352 |
returnErr(TM_E_TMINVAL);
|
| 353 |
if (len < 0)
|
| 354 |
returnErr(TM_E_ILLEGAL);
|
| 355 |
if (len == 0)
|
| 356 |
returnOK;
|
| 357 |
/* first, grow limits */
|
| 358 |
if (tms->histo == NULL) {
|
| 359 |
for (i = len; i-- && ls[i] < MINBRT; )
|
| 360 |
;
|
| 361 |
if (i < 0)
|
| 362 |
returnOK;
|
| 363 |
tms->hbrmin = tms->hbrmax = ls[i];
|
| 364 |
oldlen = 0;
|
| 365 |
} else {
|
| 366 |
oldorig = HISTI(tms->hbrmin);
|
| 367 |
oldlen = HISTI(tms->hbrmax) + 1 - oldorig;
|
| 368 |
}
|
| 369 |
for (i = len; i--; ) {
|
| 370 |
if (ls[i] < MINBRT)
|
| 371 |
continue;
|
| 372 |
if (ls[i] < tms->hbrmin)
|
| 373 |
tms->hbrmin = ls[i];
|
| 374 |
else if (ls[i] > tms->hbrmax)
|
| 375 |
tms->hbrmax = ls[i];
|
| 376 |
}
|
| 377 |
horig = HISTI(tms->hbrmin);
|
| 378 |
hlen = HISTI(tms->hbrmax) + 1 - horig;
|
| 379 |
if (hlen > oldlen) { /* (re)allocate histogram */
|
| 380 |
HIST_TYP *newhist = (HIST_TYP *)calloc(hlen, sizeof(HIST_TYP));
|
| 381 |
if (newhist == NULL)
|
| 382 |
returnErr(TM_E_NOMEM);
|
| 383 |
if (oldlen) { /* copy and free old */
|
| 384 |
memcpy(newhist+(oldorig-horig),
|
| 385 |
tms->histo, oldlen*sizeof(HIST_TYP));
|
| 386 |
free(tms->histo);
|
| 387 |
}
|
| 388 |
tms->histo = newhist;
|
| 389 |
}
|
| 390 |
if (wt == 0)
|
| 391 |
returnOK;
|
| 392 |
for (i = len; i--; ) /* add in new counts */
|
| 393 |
if (ls[i] >= MINBRT)
|
| 394 |
tms->histo[ HISTI(ls[i]) - horig ] += wt;
|
| 395 |
returnOK;
|
| 396 |
}
|
| 397 |
|
| 398 |
|
| 399 |
static double
|
| 400 |
htcontrs( /* human threshold contrast sensitivity, dL(La) */
|
| 401 |
double La
|
| 402 |
)
|
| 403 |
{
|
| 404 |
double l10La, l10dL;
|
| 405 |
/* formula taken from Ferwerda et al. [SG96] */
|
| 406 |
if (La < 1.148e-4)
|
| 407 |
return(1.38e-3);
|
| 408 |
l10La = log10(La);
|
| 409 |
if (l10La < -1.44) /* rod response regime */
|
| 410 |
l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86;
|
| 411 |
else if (l10La < -.0184)
|
| 412 |
l10dL = l10La - .395;
|
| 413 |
else if (l10La < 1.9) /* cone response regime */
|
| 414 |
l10dL = pow(.249*l10La + .65, 2.7) - .72;
|
| 415 |
else
|
| 416 |
l10dL = l10La - 1.255;
|
| 417 |
|
| 418 |
return(exp10(l10dL));
|
| 419 |
}
|
| 420 |
|
| 421 |
|
| 422 |
int
|
| 423 |
tmFixedMapping( /* compute fixed, linear tone-mapping */
|
| 424 |
TMstruct *tms,
|
| 425 |
double expmult,
|
| 426 |
double gamval,
|
| 427 |
double Lddyn
|
| 428 |
)
|
| 429 |
{
|
| 430 |
static const char funcName[] = "tmFixedMapping";
|
| 431 |
const int maxV = (1L<<(8*sizeof(TMAP_TYP))) - 1;
|
| 432 |
double minD;
|
| 433 |
int i;
|
| 434 |
|
| 435 |
if (!tmNewMap(tms))
|
| 436 |
returnErr(TM_E_NOMEM);
|
| 437 |
/* check arguments */
|
| 438 |
if (expmult <= .0) expmult = 1.;
|
| 439 |
if (gamval < MINGAM) gamval = tms->mongam;
|
| 440 |
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN;
|
| 441 |
minD = 1./Lddyn;
|
| 442 |
for (i = tms->mbrmax-tms->mbrmin+1; i--; ) {
|
| 443 |
double d;
|
| 444 |
d = expmult/tms->inpsf * tmLuminance(tms->mbrmin + i);
|
| 445 |
if (d >= 2.*minD)
|
| 446 |
d -= minD;
|
| 447 |
else /* soft black crushing */
|
| 448 |
d *= d/(4.*minD);
|
| 449 |
d /= 1. - minD;
|
| 450 |
d = TM_BRES*pow(d, 1./gamval);
|
| 451 |
tms->lumap[i] = (d > maxV) ? maxV : (int)d;
|
| 452 |
}
|
| 453 |
returnOK;
|
| 454 |
}
|
| 455 |
|
| 456 |
|
| 457 |
int
|
| 458 |
tmComputeMapping( /* compute histogram tone-mapping */
|
| 459 |
TMstruct *tms,
|
| 460 |
double gamval,
|
| 461 |
double Lddyn,
|
| 462 |
double Ldmax
|
| 463 |
)
|
| 464 |
{
|
| 465 |
static const char funcName[] = "tmComputeMapping";
|
| 466 |
HIST_TYP *histo;
|
| 467 |
float *cumf;
|
| 468 |
int brt0, histlen;
|
| 469 |
HIST_TYP threshold, ceiling, trimmings, histot;
|
| 470 |
double logLddyn, Ldmin, Lwavg, Tr, Lw, Ld;
|
| 471 |
double sum;
|
| 472 |
double d;
|
| 473 |
int i, j;
|
| 474 |
|
| 475 |
if (tms == NULL || tms->histo == NULL)
|
| 476 |
returnErr(TM_E_TMINVAL);
|
| 477 |
/* check arguments */
|
| 478 |
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN;
|
| 479 |
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX;
|
| 480 |
if (gamval < MINGAM) gamval = tms->mongam;
|
| 481 |
/* compute handy values */
|
| 482 |
Ldmin = Ldmax/Lddyn;
|
| 483 |
logLddyn = log(Lddyn);
|
| 484 |
i = HISTI(tms->hbrmin);
|
| 485 |
brt0 = HISTV(i);
|
| 486 |
histlen = HISTI(tms->hbrmax) + 1 - i;
|
| 487 |
/* histogram total and mean */
|
| 488 |
histot = 0; sum = 0;
|
| 489 |
j = brt0 + histlen*HISTEP;
|
| 490 |
for (i = histlen; i--; ) {
|
| 491 |
histot += tms->histo[i];
|
| 492 |
sum += (double)(j -= HISTEP) * tms->histo[i];
|
| 493 |
}
|
| 494 |
if (!histot)
|
| 495 |
returnErr(TM_E_TMFAIL);
|
| 496 |
threshold = histot/500 + 1;
|
| 497 |
Lwavg = tmLuminance( (double)sum / histot );
|
| 498 |
/* use linear tone mapping? */
|
| 499 |
if (tms->flags & TM_F_LINEAR ||
|
| 500 |
tms->hbrmax - tms->hbrmin < TM_BRTSCALE*logLddyn)
|
| 501 |
goto linearmap;
|
| 502 |
/* clamp histogram */
|
| 503 |
histo = (HIST_TYP *)malloc(histlen*sizeof(HIST_TYP));
|
| 504 |
cumf = (float *)malloc((histlen+2)*sizeof(float));
|
| 505 |
if ((histo == NULL) | (cumf == NULL))
|
| 506 |
returnErr(TM_E_NOMEM);
|
| 507 |
cumf[histlen+1] = 1.; /* guard for assignment code */
|
| 508 |
/* make malleable copy */
|
| 509 |
memcpy(histo, tms->histo, histlen*sizeof(HIST_TYP));
|
| 510 |
do { /* iterate to solution */
|
| 511 |
sum = 0; /* cumulative probability */
|
| 512 |
for (i = 0; i < histlen; i++) {
|
| 513 |
cumf[i] = sum/histot;
|
| 514 |
sum += (double)histo[i];
|
| 515 |
}
|
| 516 |
cumf[histlen] = 1.;
|
| 517 |
Tr = histot * (double)(tms->hbrmax - tms->hbrmin) /
|
| 518 |
((double)TM_BRTSCALE*histlen*logLddyn);
|
| 519 |
ceiling = Tr + 1.;
|
| 520 |
trimmings = 0; /* clip to envelope */
|
| 521 |
for (i = histlen; i--; ) {
|
| 522 |
if (tms->flags & TM_F_HCONTR) {
|
| 523 |
Lw = tmLuminance(brt0 + i*HISTEP);
|
| 524 |
Ld = Ldmin * exp( logLddyn *
|
| 525 |
.5*(cumf[i]+cumf[i+1]) );
|
| 526 |
ceiling = Tr * (htcontrs(Ld) * Lw) /
|
| 527 |
(htcontrs(Lw) * Ld) + 1.;
|
| 528 |
}
|
| 529 |
if (histo[i] > ceiling) {
|
| 530 |
trimmings += histo[i] - ceiling;
|
| 531 |
histo[i] = ceiling;
|
| 532 |
}
|
| 533 |
}
|
| 534 |
/* check if we're out of data */
|
| 535 |
if ((histot -= trimmings) <= threshold) {
|
| 536 |
free(histo);
|
| 537 |
free(cumf);
|
| 538 |
goto linearmap;
|
| 539 |
}
|
| 540 |
} while (40*trimmings > histot);
|
| 541 |
/* allocate space for mapping */
|
| 542 |
if (!tmNewMap(tms))
|
| 543 |
returnErr(TM_E_NOMEM);
|
| 544 |
/* assign tone-mapping */
|
| 545 |
for (i = tms->mbrmax-tms->mbrmin+1; i--; ) {
|
| 546 |
j = d = (double)i/(tms->mbrmax-tms->mbrmin)*histlen;
|
| 547 |
d -= (double)j;
|
| 548 |
Ld = Ldmin*exp(logLddyn*((1.-d)*cumf[j]+d*cumf[j+1]));
|
| 549 |
d = (Ld - Ldmin)/(Ldmax - Ldmin);
|
| 550 |
tms->lumap[i] = TM_BRES*pow(d, 1./gamval);
|
| 551 |
}
|
| 552 |
free(histo); /* clean up and return */
|
| 553 |
free(cumf);
|
| 554 |
returnOK;
|
| 555 |
linearmap: /* linear tone-mapping */
|
| 556 |
if (tms->flags & TM_F_HCONTR)
|
| 557 |
d = htcontrs(sqrt(Ldmax*Ldmin)) / htcontrs(Lwavg);
|
| 558 |
else
|
| 559 |
d = Ldmax / tmLuminance(tms->hbrmax);
|
| 560 |
return(tmFixedMapping(tms, tms->inpsf*d/Ldmax, gamval, Lddyn));
|
| 561 |
}
|
| 562 |
|
| 563 |
|
| 564 |
int
|
| 565 |
tmMapPixels( /* apply tone-mapping to pixel(s) */
|
| 566 |
TMstruct *tms,
|
| 567 |
uby8 *ps,
|
| 568 |
TMbright *ls,
|
| 569 |
uby8 *cs,
|
| 570 |
int len
|
| 571 |
)
|
| 572 |
{
|
| 573 |
static const char funcName[] = "tmMapPixels";
|
| 574 |
TMbright lv;
|
| 575 |
TMAP_TYP li;
|
| 576 |
int pv;
|
| 577 |
|
| 578 |
if (tms == NULL || tms->lumap == NULL)
|
| 579 |
returnErr(TM_E_TMINVAL);
|
| 580 |
if ((ps == NULL) | (ls == NULL) | (len < 0))
|
| 581 |
returnErr(TM_E_ILLEGAL);
|
| 582 |
while (len--) {
|
| 583 |
if ((lv = *ls++) < tms->mbrmin) {
|
| 584 |
li = 0;
|
| 585 |
} else {
|
| 586 |
if (lv > tms->mbrmax)
|
| 587 |
lv = tms->mbrmax;
|
| 588 |
li = tms->lumap[lv - tms->mbrmin];
|
| 589 |
}
|
| 590 |
if (cs == TM_NOCHROM) {
|
| 591 |
#if !(TM_BRES & 0xff)
|
| 592 |
*ps++ = li>=TM_BRES ? 255 : li/(TM_BRES>>8);
|
| 593 |
#else
|
| 594 |
*ps++ = li>=TM_BRES ? 255 : (li<<8)/TM_BRES;
|
| 595 |
#endif
|
| 596 |
} else {
|
| 597 |
pv = *cs++ * li / tms->cdiv[RED];
|
| 598 |
*ps++ = pv>255 ? 255 : pv;
|
| 599 |
pv = *cs++ * li / tms->cdiv[GRN];
|
| 600 |
*ps++ = pv>255 ? 255 : pv;
|
| 601 |
pv = *cs++ * li / tms->cdiv[BLU];
|
| 602 |
*ps++ = pv>255 ? 255 : pv;
|
| 603 |
}
|
| 604 |
}
|
| 605 |
returnOK;
|
| 606 |
}
|
| 607 |
|
| 608 |
|
| 609 |
TMstruct *
|
| 610 |
tmDup( /* duplicate tone mapping */
|
| 611 |
TMstruct *tms
|
| 612 |
)
|
| 613 |
{
|
| 614 |
int len;
|
| 615 |
int i;
|
| 616 |
TMstruct *tmnew;
|
| 617 |
|
| 618 |
if (tms == NULL) /* anything to duplicate? */
|
| 619 |
return(NULL);
|
| 620 |
tmnew = (TMstruct *)malloc(sizeof(TMstruct));
|
| 621 |
if (tmnew == NULL)
|
| 622 |
return(NULL);
|
| 623 |
*tmnew = *tms; /* copy everything */
|
| 624 |
if (tmnew->histo != NULL) { /* duplicate histogram */
|
| 625 |
len = HISTI(tmnew->hbrmax) + 1 - HISTI(tmnew->hbrmin);
|
| 626 |
tmnew->histo = (HIST_TYP *)malloc(len*sizeof(HIST_TYP));
|
| 627 |
if (tmnew->histo != NULL)
|
| 628 |
memcpy(tmnew->histo, tms->histo, len*sizeof(HIST_TYP));
|
| 629 |
}
|
| 630 |
if (tmnew->lumap != NULL) { /* duplicate luminance mapping */
|
| 631 |
len = tmnew->mbrmax-tmnew->mbrmin+1;
|
| 632 |
tmnew->lumap = (TMAP_TYP *)malloc(len*sizeof(TMAP_TYP));
|
| 633 |
if (tmnew->lumap != NULL)
|
| 634 |
memcpy(tmnew->lumap, tms->lumap, len*sizeof(TMAP_TYP));
|
| 635 |
}
|
| 636 |
/* clear package data */
|
| 637 |
for (i = tmNumPkgs; i--; )
|
| 638 |
tmnew->pd[i] = NULL;
|
| 639 |
/* return copy */
|
| 640 |
return(tmnew);
|
| 641 |
}
|
| 642 |
|
| 643 |
|
| 644 |
void
|
| 645 |
tmDone(tms) /* done with tone mapping -- destroy it */
|
| 646 |
TMstruct *tms;
|
| 647 |
{
|
| 648 |
int i;
|
| 649 |
/* NULL arg. is equiv. to tms */
|
| 650 |
if (tms == NULL)
|
| 651 |
return;
|
| 652 |
/* free tables */
|
| 653 |
if (tms->histo != NULL)
|
| 654 |
free(tms->histo);
|
| 655 |
if (tms->lumap != NULL)
|
| 656 |
free(tms->lumap);
|
| 657 |
/* free private data */
|
| 658 |
for (i = tmNumPkgs; i--; )
|
| 659 |
if (tms->pd[i] != NULL)
|
| 660 |
(*tmPkg[i]->Free)(tms->pd[i]);
|
| 661 |
free(tms); /* free basic structure */
|
| 662 |
}
|
| 663 |
|
| 664 |
/******************** Shared but Private library routines *********************/
|
| 665 |
|
| 666 |
uby8 tmMesofact[BMESUPPER-BMESLOWER];
|
| 667 |
|
| 668 |
void
|
| 669 |
tmMkMesofact() /* build mesopic lookup factor table */
|
| 670 |
{
|
| 671 |
int i;
|
| 672 |
|
| 673 |
if (tmMesofact[BMESUPPER-BMESLOWER-1])
|
| 674 |
return;
|
| 675 |
|
| 676 |
for (i = BMESLOWER; i < BMESUPPER; i++)
|
| 677 |
tmMesofact[i-BMESLOWER] = 256. *
|
| 678 |
(tmLuminance(i) - LMESLOWER) /
|
| 679 |
(LMESUPPER - LMESLOWER);
|
| 680 |
}
|
| 681 |
|
| 682 |
|
| 683 |
int
|
| 684 |
tmNewMap( /* allocate new tone-mapping array */
|
| 685 |
TMstruct *tms
|
| 686 |
)
|
| 687 |
{
|
| 688 |
if (tms->lumap != NULL && (tms->mbrmax - tms->mbrmin) !=
|
| 689 |
(tms->hbrmax - tms->hbrmin)) {
|
| 690 |
free(tms->lumap);
|
| 691 |
tms->lumap = NULL;
|
| 692 |
}
|
| 693 |
tms->mbrmin = tms->hbrmin;
|
| 694 |
tms->mbrmax = tms->hbrmax;
|
| 695 |
if (tms->mbrmin > tms->mbrmax)
|
| 696 |
return(0);
|
| 697 |
if (tms->lumap == NULL)
|
| 698 |
tms->lumap = (TMAP_TYP *)calloc(tms->mbrmax-tms->mbrmin+1,
|
| 699 |
sizeof(TMAP_TYP));
|
| 700 |
else
|
| 701 |
memset(tms->lumap, 0, (tms->mbrmax-tms->mbrmin+1)*sizeof(TMAP_TYP));
|
| 702 |
|
| 703 |
return(tms->lumap != NULL);
|
| 704 |
}
|
| 705 |
|
| 706 |
|
| 707 |
int
|
| 708 |
tmErrorReturn( /* error return (with message) */
|
| 709 |
const char *func,
|
| 710 |
TMstruct *tms,
|
| 711 |
int err
|
| 712 |
)
|
| 713 |
{
|
| 714 |
if (tms != NULL) {
|
| 715 |
tms->lastFunc = func;
|
| 716 |
tms->lastError = err;
|
| 717 |
if (tms->flags & TM_F_NOSTDERR)
|
| 718 |
return(err);
|
| 719 |
}
|
| 720 |
fputs(func, stderr);
|
| 721 |
fputs(": ", stderr);
|
| 722 |
fputs(tmErrorMessage[err], stderr);
|
| 723 |
fputs("!\n", stderr);
|
| 724 |
return(err);
|
| 725 |
}
|
