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greg |
3.1 |
/* Copyright (c) 1997 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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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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*/ |
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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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#define exp10(x) exp(M_LN10*(x)) |
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struct tmStruct *tmTop = NULL; /* current tone mapping stack */ |
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int |
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tmErrorReturn(func, err) /* error return (with message) */ |
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char *func; |
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int err; |
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{ |
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if (tmTop != NULL && tmTop->flags & TM_F_NOERRS) |
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return(err); |
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fputs(func, stderr); |
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fputs(": ", stderr); |
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fputs(tmErrorMessage[err], stderr); |
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fputs("!\n", stderr); |
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return(err); |
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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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static char funcName[] = "tmInit"; |
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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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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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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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tmnew->clfb[RED] = 256.*tmnew->clf[RED] + .5; |
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tmnew->clfb[GRN] = 256.*tmnew->clf[GRN] + .5; |
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tmnew->clfb[BLU] = 256.*tmnew->clf[BLU] + .5; |
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tmnew->clfb[EXP] = COLXS; |
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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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for (i = TM_GAMTSZ; i--; ) |
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tmnew->gamb[i] = 256.*pow((i+.5)/TM_GAMTSZ, 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->inpsfb = TM_BRTSCALE*log(tmnew->inpsf) + .5; |
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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->flags &= ~TM_F_NEEDMAT; |
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tmnew->brmin = tmnew->brmax = 0; |
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tmnew->histo = NULL; |
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tmnew->lumap = NULL; |
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tmnew->tmprev = NULL; |
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tmnew->flags |= TM_F_INITED; |
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/* make it current */ |
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tmnew->tmprev = tmTop; |
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return(tmTop = tmnew); |
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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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tmTop->inpsfb = TM_BRTSCALE*log(sf) + (sf>=1. ? .5 : -.5); |
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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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tmTop->clfb[CIEX] = tmTop->clfb[CIEZ] = 0; |
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tmTop->clfb[CIEY] = 255; |
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} else { |
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comprgb2xyzmat(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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} else if (tmTop->inppri == TM_XYZPRIM) /* input is XYZ */ |
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compxyz2rgbmat(tmTop->cmat, tmTop->monpri); |
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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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comprgb2rgbmat(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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if (tmTop->inppri != tmTop->monpri) |
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tmTop->flags |= TM_F_NEEDMAT; |
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else |
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tmTop->flags &= ~TM_F_NEEDMAT; |
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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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{ |
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if (tmTop == NULL || tmTop->histo == NULL) |
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return; |
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free((char *)tmTop->histo); |
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tmTop->histo = NULL; |
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} |
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int |
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tmCvColors(ls, cs, scan, len) /* convert float colors */ |
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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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COLOR cmon; |
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double lum, slum; |
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register double d; |
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register int i; |
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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--; ) { |
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if (tmTop->flags & TM_F_NEEDMAT) /* get monitor RGB */ |
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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]; |
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} |
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/* world luminance */ |
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lum = tmTop->clf[RED]*cmon[RED] + |
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tmTop->clf[GRN]*cmon[GRN] + |
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tmTop->clf[BLU]*cmon[BLU] ; |
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/* check range */ |
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if (clipgamut(cmon, lum, CGAMUT_LOWER, cblack, cwhite)) |
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lum = tmTop->clf[RED]*cmon[RED] + |
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tmTop->clf[GRN]*cmon[GRN] + |
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tmTop->clf[BLU]*cmon[BLU] ; |
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if (lum < MINLUM) { |
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ls[i] = MINBRT-1; /* bogus value */ |
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lum = MINLUM; |
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} else { |
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d = TM_BRTSCALE*log(lum); /* encode it */ |
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ls[i] = d>0. ? (int)(d+.5) : (int)(d-.5); |
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} |
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if (cs == TM_NOCHROM) /* no color? */ |
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continue; |
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if (tmTop->flags & TM_F_MESOPIC && lum < LMESUPPER) { |
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slum = scotlum(cmon); /* mesopic adj. */ |
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if (lum < LMESLOWER) |
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cmon[RED] = cmon[GRN] = cmon[BLU] = slum; |
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else { |
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d = (lum - LMESLOWER)/(LMESUPPER - LMESLOWER); |
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if (tmTop->flags & TM_F_BW) |
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cmon[RED] = cmon[GRN] = |
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cmon[BLU] = d*lum; |
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else |
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scalecolor(cmon, d); |
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d = (1.-d)*slum; |
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cmon[RED] += d; |
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cmon[GRN] += d; |
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cmon[BLU] += d; |
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} |
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} else if (tmTop->flags & TM_F_BW) { |
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cmon[RED] = cmon[GRN] = cmon[BLU] = lum; |
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} |
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d = tmTop->clf[RED]*cmon[RED]/lum; |
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/* cs[3*i ] = d>.999 ? 255 : 256.*pow(d, 1./tmTop->mongam); */ |
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cs[3*i ] = d>.999 ? 255 : tmTop->gamb[(int)(d*TM_GAMTSZ)]; |
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d = tmTop->clf[GRN]*cmon[GRN]/lum; |
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/* cs[3*i+1] = d>.999 ? 255 : 256.*pow(d, 1./tmTop->mongam); */ |
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cs[3*i+1] = d>.999 ? 255 : tmTop->gamb[(int)(d*TM_GAMTSZ)]; |
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d = tmTop->clf[BLU]*cmon[BLU]/lum; |
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/* cs[3*i+2] = d>.999 ? 255 : 256.*pow(d, 1./tmTop->mongam); */ |
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cs[3*i+2] = d>.999 ? 255 : tmTop->gamb[(int)(d*TM_GAMTSZ)]; |
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} |
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returnOK; |
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} |
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int |
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tmAddHisto(ls, len, wt) /* add values to histogram */ |
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register TMbright *ls; |
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int len; |
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int wt; |
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{ |
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static char funcName[] = "tmAddHisto"; |
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int sum, oldorig, oldlen, horig, hlen; |
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register int i, j; |
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if (len <= 0) |
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returnErr(TM_E_ILLEGAL); |
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if (tmTop == NULL) |
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returnErr(TM_E_TMINVAL); |
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/* first, grow limits */ |
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if (tmTop->histo == NULL) { |
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for (i = len; i-- && ls[i] < MINBRT; ) |
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; |
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if (i < 0) |
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returnOK; |
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tmTop->brmin = tmTop->brmax = ls[i]; |
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oldlen = 0; |
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} else { |
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oldorig = (tmTop->brmin-MINBRT)/HISTEP; |
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oldlen = (tmTop->brmax-MINBRT)/HISTEP + 1 - oldorig; |
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} |
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for (i = len; i--; ) { |
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if ((j = ls[i]) < MINBRT) |
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continue; |
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if (j < tmTop->brmin) |
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tmTop->brmin = j; |
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else if (j > tmTop->brmax) |
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tmTop->brmax = j; |
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} |
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horig = (tmTop->brmin-MINBRT)/HISTEP; |
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hlen = (tmTop->brmax-MINBRT)/HISTEP + 1 - horig; |
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if (hlen > oldlen) { /* (re)allocate histogram */ |
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register int *newhist = (int *)calloc(hlen, sizeof(int)); |
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if (newhist == NULL) |
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returnErr(TM_E_NOMEM); |
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if (oldlen) { /* copy and free old */ |
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for (i = oldlen, j = i+oldorig-horig; i--; ) |
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newhist[--j] = tmTop->histo[i]; |
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free((char *)tmTop->histo); |
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} |
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tmTop->histo = newhist; |
| 285 |
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if (tmTop->lumap != NULL) { /* invalid tone map */ |
| 286 |
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free((char *)tmTop->lumap); |
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tmTop->lumap = NULL; |
| 288 |
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} |
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} |
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if (wt == 0) |
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returnOK; |
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for (i = len; i--; ) /* add in new counts */ |
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if (ls[i] >= MINBRT) |
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tmTop->histo[ (ls[i]-MINBRT)/HISTEP - horig ] += wt; |
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returnOK; |
| 296 |
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} |
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static double |
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htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
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double La; |
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{ |
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double l10La, l10dL; |
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/* formula taken from Ferwerda et al. [SG96] */ |
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if (La < 1.148e-4) |
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return(1.38e-3); |
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l10La = log10(La); |
| 308 |
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if (l10La < -1.44) /* rod response regime */ |
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l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86; |
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else if (l10La < -.0184) |
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l10dL = l10La - .395; |
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else if (l10La < 1.9) /* cone response regime */ |
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l10dL = pow(.249*l10La + .65, 2.7) - .72; |
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else |
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l10dL = l10La - 1.255; |
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return(exp10(l10dL)); |
| 318 |
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} |
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int |
| 322 |
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tmComputeMapping(gamval, Lddyn, Ldmax) |
| 323 |
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double gamval; |
| 324 |
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double Lddyn; |
| 325 |
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double Ldmax; |
| 326 |
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{ |
| 327 |
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static char funcName[] = "tmComputeMapping"; |
| 328 |
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int *histo; |
| 329 |
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float *cumf; |
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int brt0, histlen, histot, threshold, ceiling, trimmings; |
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double logLddyn, Ldmin, Ldavg, Lwavg, Tr, Lw, Ld; |
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int4 sum; |
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register double d; |
| 334 |
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register int i, j; |
| 335 |
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|
| 336 |
|
|
if (tmTop == NULL || tmTop->histo == NULL) |
| 337 |
|
|
returnErr(TM_E_TMINVAL); |
| 338 |
|
|
/* check arguments */ |
| 339 |
|
|
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
| 340 |
|
|
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
| 341 |
|
|
if (gamval < MINGAM) gamval = tmTop->mongam; |
| 342 |
|
|
/* compute handy values */ |
| 343 |
|
|
Ldmin = Ldmax/Lddyn; |
| 344 |
|
|
logLddyn = log(Lddyn); |
| 345 |
|
|
Ldavg = sqrt(Ldmax*Ldmin); |
| 346 |
|
|
i = (tmTop->brmin-MINBRT)/HISTEP; |
| 347 |
|
|
brt0 = MINBRT + HISTEP/2 + i*HISTEP; |
| 348 |
|
|
histlen = (tmTop->brmax-MINBRT)/HISTEP + 1 - i; |
| 349 |
|
|
/* allocate temporary tables */ |
| 350 |
|
|
histo = (int *)malloc(histlen*sizeof(int)); |
| 351 |
|
|
cumf = (float *)malloc((histlen+1)*sizeof(float)); |
| 352 |
|
|
if (histo == NULL | cumf == NULL) |
| 353 |
|
|
returnErr(TM_E_NOMEM); |
| 354 |
|
|
/* histogram total and mean */ |
| 355 |
|
|
histot = 0; sum = 0; |
| 356 |
|
|
j = brt0 + histlen*HISTEP; |
| 357 |
|
|
for (i = histlen; i--; ) { |
| 358 |
|
|
histot += (histo[i] = tmTop->histo[i]); |
| 359 |
|
|
sum += (j -= HISTEP) * histo[i]; |
| 360 |
|
|
} |
| 361 |
|
|
threshold = histot*.025 + .5; |
| 362 |
|
|
if (threshold < 4) |
| 363 |
|
|
returnErr(TM_E_TMFAIL); |
| 364 |
|
|
Lwavg = tmLuminance( (double)sum / histot ); |
| 365 |
|
|
do { /* iterate to solution */ |
| 366 |
|
|
sum = 0; /* compute cumulative probability */ |
| 367 |
|
|
for (i = 0; i < histlen; i++) { |
| 368 |
|
|
cumf[i] = (double)sum/histot; |
| 369 |
|
|
sum += histo[i]; |
| 370 |
|
|
} |
| 371 |
|
|
cumf[i] = 1.; |
| 372 |
|
|
Tr = histot * (double)(tmTop->brmax - tmTop->brmin) / |
| 373 |
|
|
((double)histlen*TM_BRTSCALE) / logLddyn; |
| 374 |
|
|
ceiling = Tr + 1.; |
| 375 |
|
|
trimmings = 0; /* clip to envelope */ |
| 376 |
|
|
for (i = histlen; i--; ) { |
| 377 |
|
|
if (tmTop->flags & TM_F_HCONTR) { |
| 378 |
|
|
Lw = tmLuminance(brt0 + i*HISTEP); |
| 379 |
|
|
Ld = Ldmin * exp( logLddyn * |
| 380 |
|
|
.5*(cumf[i]+cumf[i+1]) ); |
| 381 |
|
|
ceiling = Tr * (htcontrs(Ld) * Lw) / |
| 382 |
|
|
(htcontrs(Lw) * Ld) + 1.; |
| 383 |
|
|
} |
| 384 |
|
|
if (histo[i] > ceiling) { |
| 385 |
|
|
trimmings += histo[i] - ceiling; |
| 386 |
|
|
histo[i] = ceiling; |
| 387 |
|
|
} |
| 388 |
|
|
} |
| 389 |
|
|
} while ((histot -= trimmings) > threshold && trimmings > threshold); |
| 390 |
|
|
|
| 391 |
|
|
if (tmTop->lumap == NULL) { /* allocate luminance map */ |
| 392 |
|
|
tmTop->lumap = (unsigned short *)malloc( |
| 393 |
|
|
(tmTop->brmax-tmTop->brmin+1)*sizeof(unsigned short) ); |
| 394 |
|
|
if (tmTop->lumap == NULL) |
| 395 |
|
|
returnErr(TM_E_NOMEM); |
| 396 |
|
|
} |
| 397 |
|
|
if (tmTop->flags & TM_F_LINEAR || histot <= threshold) { |
| 398 |
|
|
/* linear tone mapping */ |
| 399 |
|
|
if (tmTop->flags & TM_F_HCONTR) |
| 400 |
|
|
d = htcontrs(Ldavg) / htcontrs(Lwavg); |
| 401 |
|
|
else |
| 402 |
|
|
d = Ldavg / Lwavg; |
| 403 |
|
|
d = log(d/Ldmax); |
| 404 |
|
|
for (i = tmTop->brmax-tmTop->brmin+1; i--; ) |
| 405 |
|
|
tmTop->lumap[i] = 256. * exp( |
| 406 |
|
|
( d + (tmTop->brmin+i)/(double)TM_BRTSCALE ) |
| 407 |
|
|
/ gamval ); |
| 408 |
|
|
} else { |
| 409 |
|
|
/* histogram adjustment */ |
| 410 |
|
|
for (i = tmTop->brmax-tmTop->brmin+1; i--; ) { |
| 411 |
|
|
j = d = (double)i/(tmTop->brmax-tmTop->brmin)*histlen; |
| 412 |
|
|
d -= (double)j; |
| 413 |
|
|
Ld = Ldmin*exp(logLddyn*((1.-d)*cumf[j]+d*cumf[j+1])); |
| 414 |
|
|
d = (Ld - Ldmin)/(Ldmax - Ldmin); |
| 415 |
|
|
tmTop->lumap[i] = 256.*pow(d, 1./gamval); |
| 416 |
|
|
} |
| 417 |
|
|
} |
| 418 |
|
|
free((char *)histo); |
| 419 |
|
|
free((char *)cumf); |
| 420 |
|
|
returnOK; |
| 421 |
|
|
} |
| 422 |
|
|
|
| 423 |
|
|
|
| 424 |
|
|
int |
| 425 |
|
|
tmMapPixels(ps, ls, cs, len) |
| 426 |
|
|
register BYTE *ps; |
| 427 |
|
|
TMbright *ls; |
| 428 |
|
|
register BYTE *cs; |
| 429 |
|
|
int len; |
| 430 |
|
|
{ |
| 431 |
|
|
static char funcName[] = "tmMapPixels"; |
| 432 |
|
|
int rdiv, gdiv, bdiv; |
| 433 |
|
|
register int li, pv; |
| 434 |
|
|
|
| 435 |
|
|
if (tmTop == NULL || tmTop->lumap == NULL) |
| 436 |
|
|
returnErr(TM_E_TMINVAL); |
| 437 |
|
|
if (ps == NULL | ls == NULL | len <= 0) |
| 438 |
|
|
returnErr(TM_E_ILLEGAL); |
| 439 |
|
|
rdiv = tmTop->gamb[((int4)TM_GAMTSZ*tmTop->clfb[RED])>>8]; |
| 440 |
|
|
gdiv = tmTop->gamb[((int4)TM_GAMTSZ*tmTop->clfb[GRN])>>8]; |
| 441 |
|
|
bdiv = tmTop->gamb[((int4)TM_GAMTSZ*tmTop->clfb[BLU])>>8]; |
| 442 |
|
|
while (len--) { |
| 443 |
|
|
if ((li = *ls++) < tmTop->brmin) |
| 444 |
|
|
li = tmTop->brmin; |
| 445 |
|
|
else if (li > tmTop->brmax) |
| 446 |
|
|
li = tmTop->brmax; |
| 447 |
|
|
li = tmTop->lumap[li - tmTop->brmin]; |
| 448 |
|
|
if (cs == TM_NOCHROM) |
| 449 |
|
|
*ps++ = li>255 ? 255 : li; |
| 450 |
|
|
else { |
| 451 |
|
|
pv = *cs++ * li / rdiv; |
| 452 |
|
|
*ps++ = pv>255 ? 255 : pv; |
| 453 |
|
|
pv = *cs++ * li / gdiv; |
| 454 |
|
|
*ps++ = pv>255 ? 255 : pv; |
| 455 |
|
|
pv = *cs++ * li / bdiv; |
| 456 |
|
|
*ps++ = pv>255 ? 255 : pv; |
| 457 |
|
|
} |
| 458 |
|
|
} |
| 459 |
|
|
returnOK; |
| 460 |
|
|
} |
| 461 |
|
|
|
| 462 |
|
|
|
| 463 |
|
|
struct tmStruct * |
| 464 |
|
|
tmPop() /* pop top tone mapping off stack */ |
| 465 |
|
|
{ |
| 466 |
|
|
register struct tmStruct *tms; |
| 467 |
|
|
|
| 468 |
|
|
if ((tms = tmTop) != NULL) |
| 469 |
|
|
tmTop = tms->tmprev; |
| 470 |
|
|
return(tms); |
| 471 |
|
|
} |
| 472 |
|
|
|
| 473 |
|
|
|
| 474 |
|
|
int |
| 475 |
|
|
tmPull(tms) /* pull a tone mapping from stack */ |
| 476 |
|
|
register struct tmStruct *tms; |
| 477 |
|
|
{ |
| 478 |
|
|
register struct tmStruct *tms2; |
| 479 |
|
|
/* special cases first */ |
| 480 |
|
|
if (tms == NULL | tmTop == NULL) |
| 481 |
|
|
return(0); |
| 482 |
|
|
if (tms == tmTop) { |
| 483 |
|
|
tmTop = tms->tmprev; |
| 484 |
|
|
tms->tmprev = NULL; |
| 485 |
|
|
return(1); |
| 486 |
|
|
} |
| 487 |
|
|
for (tms2 = tmTop; tms2->tmprev != NULL; tms2 = tms2->tmprev) |
| 488 |
|
|
if (tms == tms2->tmprev) { /* remove it */ |
| 489 |
|
|
tms2->tmprev = tms->tmprev; |
| 490 |
|
|
tms->tmprev = NULL; |
| 491 |
|
|
return(1); |
| 492 |
|
|
} |
| 493 |
|
|
return(0); /* not found on stack */ |
| 494 |
|
|
} |
| 495 |
|
|
|
| 496 |
|
|
|
| 497 |
|
|
int |
| 498 |
|
|
tmPush(tms) /* push tone mapping on top of stack */ |
| 499 |
|
|
register struct tmStruct *tms; |
| 500 |
|
|
{ |
| 501 |
|
|
static char funcName[] = "tmPush"; |
| 502 |
|
|
/* check validity */ |
| 503 |
|
|
if (tms == NULL || !(tms->flags & TM_F_INITED)) |
| 504 |
|
|
returnErr(TM_E_ILLEGAL); |
| 505 |
|
|
if (tms == tmTop) /* check necessity */ |
| 506 |
|
|
returnOK; |
| 507 |
|
|
/* pull if already in stack */ |
| 508 |
|
|
(void)tmPull(tms); |
| 509 |
|
|
/* push it on top */ |
| 510 |
|
|
tms->tmprev = tmTop; |
| 511 |
|
|
tmTop = tms; |
| 512 |
|
|
returnOK; |
| 513 |
|
|
} |
| 514 |
|
|
|
| 515 |
|
|
|
| 516 |
|
|
void |
| 517 |
|
|
tmDone(tms) /* done with tone mapping -- destroy it */ |
| 518 |
|
|
register struct tmStruct *tms; |
| 519 |
|
|
{ |
| 520 |
|
|
/* NULL arg. is equiv. to tmTop */ |
| 521 |
|
|
if (tms == NULL && (tms = tmTop) == NULL) |
| 522 |
|
|
return; |
| 523 |
|
|
/* take out of stack if present */ |
| 524 |
|
|
(void)tmPull(tms); |
| 525 |
|
|
/* free tables */ |
| 526 |
|
|
if (tms->histo != NULL) |
| 527 |
|
|
free((char *)tms->histo); |
| 528 |
|
|
if (tms->lumap != NULL) |
| 529 |
|
|
free((char *)tms->lumap); |
| 530 |
|
|
tms->flags = 0; |
| 531 |
|
|
free((char *)tms); /* free basic structure */ |
| 532 |
|
|
} |
