| 1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Tone mapping functions. |
| 9 |
* See tonemap.h for detailed function descriptions. |
| 10 |
*/ |
| 11 |
|
| 12 |
#include <stdio.h> |
| 13 |
#include <math.h> |
| 14 |
#include "tmprivat.h" |
| 15 |
#include "tmerrmsg.h" |
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|
| 17 |
#define exp10(x) exp(M_LN10*(x)) |
| 18 |
|
| 19 |
struct tmStruct *tmTop = NULL; /* current tone mapping stack */ |
| 20 |
|
| 21 |
/* our list of conversion packages */ |
| 22 |
struct tmPackage *tmPkg[TM_MAXPKG]; |
| 23 |
int tmNumPkgs = 0; /* number of registered packages */ |
| 24 |
|
| 25 |
int tmLastError; /* last error incurred by library */ |
| 26 |
char *tmLastFunction; /* error-generating function name */ |
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|
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|
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int |
| 30 |
tmErrorReturn(func, err) /* error return (with message) */ |
| 31 |
char *func; |
| 32 |
int err; |
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{ |
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tmLastFunction = func; |
| 35 |
tmLastError = err; |
| 36 |
if (tmTop != NULL && tmTop->flags & TM_F_NOSTDERR) |
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return(err); |
| 38 |
fputs(func, stderr); |
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fputs(": ", stderr); |
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fputs(tmErrorMessage[err], stderr); |
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fputs("!\n", stderr); |
| 42 |
return(err); |
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} |
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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 */ |
| 48 |
int flags; |
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RGBPRIMP monpri; |
| 50 |
double gamval; |
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{ |
| 52 |
static char funcName[] = "tmInit"; |
| 53 |
COLORMAT cmat; |
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register struct tmStruct *tmnew; |
| 55 |
register int i; |
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/* allocate structure */ |
| 57 |
tmnew = (struct tmStruct *)malloc(sizeof(struct tmStruct)); |
| 58 |
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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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] = 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 = tmnew->hbrmax = 0; |
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tmnew->histo = NULL; |
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tmnew->mbrmin = tmnew->mbrmax = 0; |
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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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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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|
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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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|
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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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/* 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 */ |
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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); |
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returnOK; |
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} |
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|
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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((MEM_PTR)tmTop->histo); |
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tmTop->histo = NULL; |
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} |
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|
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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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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; |
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|
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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); |
| 191 |
for (i = len; i--; ) { |
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if (tmNeedMatrix(tmTop)) /* 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, csmall, 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 : |
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(int)(256.*pow(d, 1./tmTop->mongam)); |
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d = tmTop->clf[GRN]*cmon[GRN]/lum; |
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cs[3*i+1] = d>=.999 ? 255 : |
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(int)(256.*pow(d, 1./tmTop->mongam)); |
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d = tmTop->clf[BLU]*cmon[BLU]/lum; |
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cs[3*i+2] = d>=.999 ? 255 : |
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(int)(256.*pow(d, 1./tmTop->mongam)); |
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} |
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returnOK; |
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} |
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|
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|
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int |
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tmAddHisto(ls, len, wt) /* add values to histogram */ |
| 252 |
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 oldorig, oldlen, horig, hlen; |
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register int i, j; |
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|
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if (tmTop == NULL) |
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returnErr(TM_E_TMINVAL); |
| 262 |
if (len < 0) |
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returnErr(TM_E_ILLEGAL); |
| 264 |
if (len == 0) |
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returnOK; |
| 266 |
/* first, grow limits */ |
| 267 |
if (tmTop->histo == NULL) { |
| 268 |
for (i = len; i-- && ls[i] < MINBRT; ) |
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; |
| 270 |
if (i < 0) |
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returnOK; |
| 272 |
tmTop->hbrmin = tmTop->hbrmax = ls[i]; |
| 273 |
oldlen = 0; |
| 274 |
} else { |
| 275 |
oldorig = (tmTop->hbrmin-MINBRT)/HISTEP; |
| 276 |
oldlen = (tmTop->hbrmax-MINBRT)/HISTEP + 1 - oldorig; |
| 277 |
} |
| 278 |
for (i = len; i--; ) { |
| 279 |
if ((j = ls[i]) < MINBRT) |
| 280 |
continue; |
| 281 |
if (j < tmTop->hbrmin) |
| 282 |
tmTop->hbrmin = j; |
| 283 |
else if (j > tmTop->hbrmax) |
| 284 |
tmTop->hbrmax = j; |
| 285 |
} |
| 286 |
horig = (tmTop->hbrmin-MINBRT)/HISTEP; |
| 287 |
hlen = (tmTop->hbrmax-MINBRT)/HISTEP + 1 - horig; |
| 288 |
if (hlen > oldlen) { /* (re)allocate histogram */ |
| 289 |
register int *newhist = (int *)calloc(hlen, sizeof(int)); |
| 290 |
if (newhist == NULL) |
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returnErr(TM_E_NOMEM); |
| 292 |
if (oldlen) { /* copy and free old */ |
| 293 |
for (i = oldlen, j = i+oldorig-horig; i; ) |
| 294 |
newhist[--j] = tmTop->histo[--i]; |
| 295 |
free((MEM_PTR)tmTop->histo); |
| 296 |
} |
| 297 |
tmTop->histo = newhist; |
| 298 |
} |
| 299 |
if (wt == 0) |
| 300 |
returnOK; |
| 301 |
for (i = len; i--; ) /* add in new counts */ |
| 302 |
if (ls[i] >= MINBRT) |
| 303 |
tmTop->histo[ (ls[i]-MINBRT)/HISTEP - horig ] += wt; |
| 304 |
returnOK; |
| 305 |
} |
| 306 |
|
| 307 |
|
| 308 |
static double |
| 309 |
htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
| 310 |
double La; |
| 311 |
{ |
| 312 |
double l10La, l10dL; |
| 313 |
/* formula taken from Ferwerda et al. [SG96] */ |
| 314 |
if (La < 1.148e-4) |
| 315 |
return(1.38e-3); |
| 316 |
l10La = log10(La); |
| 317 |
if (l10La < -1.44) /* rod response regime */ |
| 318 |
l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86; |
| 319 |
else if (l10La < -.0184) |
| 320 |
l10dL = l10La - .395; |
| 321 |
else if (l10La < 1.9) /* cone response regime */ |
| 322 |
l10dL = pow(.249*l10La + .65, 2.7) - .72; |
| 323 |
else |
| 324 |
l10dL = l10La - 1.255; |
| 325 |
|
| 326 |
return(exp10(l10dL)); |
| 327 |
} |
| 328 |
|
| 329 |
|
| 330 |
int |
| 331 |
tmComputeMapping(gamval, Lddyn, Ldmax) |
| 332 |
double gamval; |
| 333 |
double Lddyn; |
| 334 |
double Ldmax; |
| 335 |
{ |
| 336 |
static char funcName[] = "tmComputeMapping"; |
| 337 |
int *histo; |
| 338 |
float *cumf; |
| 339 |
int brt0, histlen, histot, threshold, ceiling, trimmings; |
| 340 |
double logLddyn, Ldmin, Ldavg, Lwavg, Tr, Lw, Ld; |
| 341 |
int4 sum; |
| 342 |
register double d; |
| 343 |
register int i, j; |
| 344 |
|
| 345 |
if (tmTop == NULL || tmTop->histo == NULL) |
| 346 |
returnErr(TM_E_TMINVAL); |
| 347 |
/* check arguments */ |
| 348 |
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
| 349 |
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
| 350 |
if (gamval < MINGAM) gamval = tmTop->mongam; |
| 351 |
/* compute handy values */ |
| 352 |
Ldmin = Ldmax/Lddyn; |
| 353 |
logLddyn = log(Lddyn); |
| 354 |
Ldavg = sqrt(Ldmax*Ldmin); |
| 355 |
i = (tmTop->hbrmin-MINBRT)/HISTEP; |
| 356 |
brt0 = MINBRT + HISTEP/2 + i*HISTEP; |
| 357 |
histlen = (tmTop->hbrmax-MINBRT)/HISTEP + 1 - i; |
| 358 |
/* histogram total and mean */ |
| 359 |
histot = 0; sum = 0; |
| 360 |
j = brt0 + histlen*HISTEP; |
| 361 |
for (i = histlen; i--; ) { |
| 362 |
histot += tmTop->histo[i]; |
| 363 |
sum += (j -= HISTEP) * tmTop->histo[i]; |
| 364 |
} |
| 365 |
threshold = histot*.025 + .5; |
| 366 |
if (threshold < 4) |
| 367 |
returnErr(TM_E_TMFAIL); |
| 368 |
Lwavg = tmLuminance( (double)sum / histot ); |
| 369 |
if (!(tmTop->flags & TM_F_LINEAR)) { /* clamp histogram */ |
| 370 |
histo = (int *)malloc(histlen*sizeof(int)); |
| 371 |
cumf = (float *)malloc((histlen+1)*sizeof(float)); |
| 372 |
if (histo == NULL | cumf == NULL) |
| 373 |
returnErr(TM_E_NOMEM); |
| 374 |
for (i = histlen; i--; ) /* make malleable copy */ |
| 375 |
histo[i] = tmTop->histo[i]; |
| 376 |
do { /* iterate to solution */ |
| 377 |
sum = 0; /* cumulative probability */ |
| 378 |
for (i = 0; i < histlen; i++) { |
| 379 |
cumf[i] = (double)sum/histot; |
| 380 |
sum += histo[i]; |
| 381 |
} |
| 382 |
cumf[i] = 1.; |
| 383 |
Tr = histot * (double)(tmTop->hbrmax - tmTop->hbrmin) / |
| 384 |
((double)histlen*TM_BRTSCALE) / logLddyn; |
| 385 |
ceiling = Tr + 1.; |
| 386 |
trimmings = 0; /* clip to envelope */ |
| 387 |
for (i = histlen; i--; ) { |
| 388 |
if (tmTop->flags & TM_F_HCONTR) { |
| 389 |
Lw = tmLuminance(brt0 + i*HISTEP); |
| 390 |
Ld = Ldmin * exp( logLddyn * |
| 391 |
.5*(cumf[i]+cumf[i+1]) ); |
| 392 |
ceiling = Tr * (htcontrs(Ld) * Lw) / |
| 393 |
(htcontrs(Lw) * Ld) + 1.; |
| 394 |
} |
| 395 |
if (histo[i] > ceiling) { |
| 396 |
trimmings += histo[i] - ceiling; |
| 397 |
histo[i] = ceiling; |
| 398 |
} |
| 399 |
} |
| 400 |
} while ((histot -= trimmings) > threshold && |
| 401 |
trimmings > threshold); |
| 402 |
} |
| 403 |
/* allocate luminance map */ |
| 404 |
if (tmTop->lumap != NULL) |
| 405 |
free((MEM_PTR)tmTop->lumap); |
| 406 |
tmTop->mbrmin = tmTop->hbrmin; |
| 407 |
tmTop->mbrmax = tmTop->hbrmax; |
| 408 |
tmTop->lumap = (unsigned short *)malloc( |
| 409 |
(tmTop->mbrmax-tmTop->mbrmin+1)*sizeof(unsigned short) ); |
| 410 |
if (tmTop->lumap == NULL) |
| 411 |
returnErr(TM_E_NOMEM); |
| 412 |
if (tmTop->flags & TM_F_LINEAR || histot <= threshold) { |
| 413 |
/* linear tone mapping */ |
| 414 |
if (tmTop->flags & TM_F_HCONTR) |
| 415 |
d = htcontrs(Ldavg) / htcontrs(Lwavg); |
| 416 |
else |
| 417 |
d = Ldavg / Lwavg; |
| 418 |
d = log(d/Ldmax); |
| 419 |
for (i = tmTop->mbrmax-tmTop->mbrmin+1; i--; ) |
| 420 |
tmTop->lumap[i] = 256. * exp( |
| 421 |
( d + (tmTop->mbrmin+i)/(double)TM_BRTSCALE ) |
| 422 |
/ gamval ); |
| 423 |
} else { |
| 424 |
/* histogram adjustment */ |
| 425 |
for (i = tmTop->mbrmax-tmTop->mbrmin+1; i--; ) { |
| 426 |
j = d = (double)i/(tmTop->mbrmax-tmTop->mbrmin)*histlen; |
| 427 |
d -= (double)j; |
| 428 |
Ld = Ldmin*exp(logLddyn*((1.-d)*cumf[j]+d*cumf[j+1])); |
| 429 |
d = (Ld - Ldmin)/(Ldmax - Ldmin); |
| 430 |
tmTop->lumap[i] = 256.*pow(d, 1./gamval); |
| 431 |
} |
| 432 |
} |
| 433 |
if (!(tmTop->flags & TM_F_LINEAR)) { |
| 434 |
free((MEM_PTR)histo); |
| 435 |
free((MEM_PTR)cumf); |
| 436 |
} |
| 437 |
returnOK; |
| 438 |
} |
| 439 |
|
| 440 |
|
| 441 |
int |
| 442 |
tmMapPixels(ps, ls, cs, len) |
| 443 |
register BYTE *ps; |
| 444 |
TMbright *ls; |
| 445 |
register BYTE *cs; |
| 446 |
int len; |
| 447 |
{ |
| 448 |
static char funcName[] = "tmMapPixels"; |
| 449 |
register int4 li, pv; |
| 450 |
|
| 451 |
if (tmTop == NULL || tmTop->lumap == NULL) |
| 452 |
returnErr(TM_E_TMINVAL); |
| 453 |
if (ps == NULL | ls == NULL | len < 0) |
| 454 |
returnErr(TM_E_ILLEGAL); |
| 455 |
while (len--) { |
| 456 |
if ((li = *ls++) < tmTop->mbrmin) |
| 457 |
li = tmTop->mbrmin; |
| 458 |
else if (li > tmTop->mbrmax) |
| 459 |
li = tmTop->mbrmax; |
| 460 |
li = tmTop->lumap[li - tmTop->mbrmin]; |
| 461 |
if (cs == TM_NOCHROM) |
| 462 |
*ps++ = li>255 ? 255 : li; |
| 463 |
else { |
| 464 |
pv = *cs++ * li / tmTop->cdiv[RED]; |
| 465 |
*ps++ = pv>255 ? 255 : pv; |
| 466 |
pv = *cs++ * li / tmTop->cdiv[GRN]; |
| 467 |
*ps++ = pv>255 ? 255 : pv; |
| 468 |
pv = *cs++ * li / tmTop->cdiv[BLU]; |
| 469 |
*ps++ = pv>255 ? 255 : pv; |
| 470 |
} |
| 471 |
} |
| 472 |
returnOK; |
| 473 |
} |
| 474 |
|
| 475 |
|
| 476 |
struct tmStruct * |
| 477 |
tmPop() /* pop top tone mapping off stack */ |
| 478 |
{ |
| 479 |
register struct tmStruct *tms; |
| 480 |
|
| 481 |
if ((tms = tmTop) != NULL) |
| 482 |
tmTop = tms->tmprev; |
| 483 |
return(tms); |
| 484 |
} |
| 485 |
|
| 486 |
|
| 487 |
int |
| 488 |
tmPull(tms) /* pull a tone mapping from stack */ |
| 489 |
register struct tmStruct *tms; |
| 490 |
{ |
| 491 |
register struct tmStruct *tms2; |
| 492 |
/* special cases first */ |
| 493 |
if (tms == NULL | tmTop == NULL) |
| 494 |
return(0); |
| 495 |
if (tms == tmTop) { |
| 496 |
tmTop = tms->tmprev; |
| 497 |
tms->tmprev = NULL; |
| 498 |
return(1); |
| 499 |
} |
| 500 |
for (tms2 = tmTop; tms2->tmprev != NULL; tms2 = tms2->tmprev) |
| 501 |
if (tms == tms2->tmprev) { /* remove it */ |
| 502 |
tms2->tmprev = tms->tmprev; |
| 503 |
tms->tmprev = NULL; |
| 504 |
return(1); |
| 505 |
} |
| 506 |
return(0); /* not found on stack */ |
| 507 |
} |
| 508 |
|
| 509 |
|
| 510 |
struct tmStruct * |
| 511 |
tmDup() /* duplicate top tone mapping */ |
| 512 |
{ |
| 513 |
int len; |
| 514 |
register int i; |
| 515 |
register struct tmStruct *tmnew; |
| 516 |
|
| 517 |
if (tmTop == NULL) /* anything to duplicate? */ |
| 518 |
return(NULL); |
| 519 |
tmnew = (struct tmStruct *)malloc(sizeof(struct tmStruct)); |
| 520 |
if (tmnew == NULL) |
| 521 |
return(NULL); |
| 522 |
*tmnew = *tmTop; /* copy everything */ |
| 523 |
if (tmnew->histo != NULL) { /* duplicate histogram */ |
| 524 |
len = (tmnew->hbrmax-MINBRT)/HISTEP + 1 - |
| 525 |
(tmnew->hbrmin-MINBRT)/HISTEP; |
| 526 |
tmnew->histo = (int *)malloc(len*sizeof(int)); |
| 527 |
if (tmnew->histo != NULL) |
| 528 |
for (i = len; i--; ) |
| 529 |
tmnew->histo[i] = tmTop->histo[i]; |
| 530 |
} |
| 531 |
if (tmnew->lumap != NULL) { /* duplicate luminance mapping */ |
| 532 |
len = tmnew->mbrmax-tmnew->mbrmin+1; |
| 533 |
tmnew->lumap = (unsigned short *)malloc( |
| 534 |
len*sizeof(unsigned short) ); |
| 535 |
if (tmnew->lumap != NULL) |
| 536 |
for (i = len; i--; ) |
| 537 |
tmnew->lumap[i] = tmTop->lumap[i]; |
| 538 |
} |
| 539 |
/* clear package data */ |
| 540 |
for (i = tmNumPkgs; i--; ) |
| 541 |
tmnew->pd[i] = NULL; |
| 542 |
tmnew->tmprev = tmTop; /* make copy current */ |
| 543 |
return(tmTop = tmnew); |
| 544 |
} |
| 545 |
|
| 546 |
|
| 547 |
int |
| 548 |
tmPush(tms) /* push tone mapping on top of stack */ |
| 549 |
register struct tmStruct *tms; |
| 550 |
{ |
| 551 |
static char funcName[] = "tmPush"; |
| 552 |
/* check validity */ |
| 553 |
if (tms == NULL) |
| 554 |
returnErr(TM_E_ILLEGAL); |
| 555 |
if (tms == tmTop) /* check necessity */ |
| 556 |
returnOK; |
| 557 |
/* pull if already in stack */ |
| 558 |
(void)tmPull(tms); |
| 559 |
/* push it on top */ |
| 560 |
tms->tmprev = tmTop; |
| 561 |
tmTop = tms; |
| 562 |
returnOK; |
| 563 |
} |
| 564 |
|
| 565 |
|
| 566 |
void |
| 567 |
tmDone(tms) /* done with tone mapping -- destroy it */ |
| 568 |
register struct tmStruct *tms; |
| 569 |
{ |
| 570 |
register int i; |
| 571 |
/* NULL arg. is equiv. to tmTop */ |
| 572 |
if (tms == NULL && (tms = tmTop) == NULL) |
| 573 |
return; |
| 574 |
/* take out of stack if present */ |
| 575 |
(void)tmPull(tms); |
| 576 |
/* free tables */ |
| 577 |
if (tms->histo != NULL) |
| 578 |
free((MEM_PTR)tms->histo); |
| 579 |
if (tms->lumap != NULL) |
| 580 |
free((MEM_PTR)tms->lumap); |
| 581 |
/* free private data */ |
| 582 |
for (i = tmNumPkgs; i--; ) |
| 583 |
if (tms->pd[i] != NULL) |
| 584 |
(*tmPkg[i]->Free)(tms->pd[i]); |
| 585 |
free((MEM_PTR)tms); /* free basic structure */ |
| 586 |
} |
