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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* Routines for tone mapping on Radiance RGBE and XYZE pictures. |
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* See tonemap.h for detailed function descriptions. |
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*/ |
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|
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#include <stdio.h> |
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#include <math.h> |
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#include "tmprivat.h" |
15 |
#include "resolu.h" |
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|
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|
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extern char *tempbuffer(); |
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|
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#define GAMTSZ 1024 |
21 |
|
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typedef struct { |
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BYTE gamb[GAMTSZ]; /* gamma lookup table */ |
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COLR clfb; /* encoded tm->clf */ |
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TMbright inpsfb; /* encoded tm->inpsf */ |
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} COLRDATA; |
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|
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static MEM_PTR colrInit(); |
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static void colrNewSpace(); |
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extern void free(); |
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static struct tmPackage colrPkg = { /* our package functions */ |
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colrInit, colrNewSpace, free |
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}; |
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static int colrReg = -1; /* our package registration number */ |
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|
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#define LOGISZ 260 |
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static TMbright logi[LOGISZ]; |
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static BYTE photofact[BMESUPPER-BMESLOWER]; |
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|
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|
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int |
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tmCvColrs(ls, cs, scan, len) /* convert RGBE/XYZE colors */ |
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TMbright *ls; |
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BYTE *cs; |
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COLR *scan; |
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int len; |
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{ |
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static char funcName[] = "tmCvColrs"; |
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COLR cmon; |
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register COLRDATA *cd; |
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register int i, bi, li; |
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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); |
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if (tmNeedMatrix(tmTop)) { /* need floating point */ |
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register COLOR *newscan; |
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newscan = (COLOR *)tempbuffer(len*sizeof(COLOR)); |
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if (newscan == NULL) |
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returnErr(TM_E_NOMEM); |
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for (i = len; i--; ) |
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colr_color(newscan[i], scan[i]); |
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return(tmCvColors(ls, cs, newscan, len)); |
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} |
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if (colrReg < 0) { /* build tables if necessary */ |
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colrReg = tmRegPkg(&colrPkg); |
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if (colrReg < 0) |
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returnErr(TM_E_CODERR1); |
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for (i = 256; i--; ) |
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logi[i] = TM_BRTSCALE*log((i+.5)/256.) - .5; |
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for (i = 256; i < LOGISZ; i++) |
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logi[i] = logi[255]; |
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for (i = BMESLOWER; i < BMESUPPER; i++) |
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photofact[i-BMESLOWER] = 256. * |
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(tmLuminance(i) - LMESLOWER) / |
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(LMESUPPER - LMESLOWER); |
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} |
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if ((cd = (COLRDATA *)tmPkgData(tmTop,colrReg)) == NULL) |
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returnErr(TM_E_NOMEM); |
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for (i = len; i--; ) { |
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copycolr(cmon, scan[i]); |
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/* world luminance */ |
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li = ( cd->clfb[RED]*cmon[RED] + |
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cd->clfb[GRN]*cmon[GRN] + |
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cd->clfb[BLU]*cmon[BLU] ) >> 8; |
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bi = BRT2SCALE*(cmon[EXP]-COLXS) + |
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logi[li] + cd->inpsfb; |
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if (bi < MINBRT) { |
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bi = MINBRT-1; /* bogus value */ |
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li++; /* avoid li==0 */ |
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} |
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ls[i] = bi; |
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if (cs == TM_NOCHROM) /* no color? */ |
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continue; |
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if (tmTop->flags & TM_F_BW) |
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cmon[RED] = cmon[GRN] = cmon[BLU] = li; |
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/* mesopic adj. */ |
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if (tmTop->flags & TM_F_MESOPIC && bi < BMESUPPER) { |
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register int pf, sli = normscot(cmon); |
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if (bi < BMESLOWER) |
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cmon[RED] = cmon[GRN] = cmon[BLU] = sli; |
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else { |
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pf = photofact[bi-BMESLOWER]; |
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sli *= 256 - pf; |
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cmon[RED] = ( sli + pf*cmon[RED] ) >> 8; |
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cmon[GRN] = ( sli + pf*cmon[GRN] ) >> 8; |
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cmon[BLU] = ( sli + pf*cmon[BLU] ) >> 8; |
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} |
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} |
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bi = ( (int4)GAMTSZ*cd->clfb[RED]*cmon[RED]/li ) >> 8; |
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cs[3*i ] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
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bi = ( (int4)GAMTSZ*cd->clfb[GRN]*cmon[GRN]/li ) >> 8; |
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cs[3*i+1] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
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bi = ( (int4)GAMTSZ*cd->clfb[BLU]*cmon[BLU]/li ) >> 8; |
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cs[3*i+2] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
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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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#define FMTRGB 1 /* Input is RGBE */ |
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#define FMTCIE 2 /* Input is CIE XYZE */ |
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#define FMTUNK 3 /* Input format is unspecified */ |
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#define FMTBAD 4 /* Input is not a recognized format */ |
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|
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static struct radhead { |
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int format; /* FMTRGB, FMTCIE, FMTUNK, FMTBAD */ |
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double expos; /* input exposure value */ |
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RGBPRIMP primp; /* input primaries */ |
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RGBPRIMS mypri; /* custom primaries */ |
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} rhdefault = {FMTUNK, 1., stdprims, STDPRIMS}; |
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|
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|
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static int |
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headline(s, rh) /* grok a header line */ |
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register char *s; |
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register struct radhead *rh; |
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{ |
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char fmt[32]; |
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|
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if (formatval(fmt, s)) { |
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if (!strcmp(fmt, COLRFMT)) |
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rh->format = FMTRGB; |
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else if (!strcmp(fmt, CIEFMT)) |
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rh->format = FMTCIE; |
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else |
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rh->format = FMTBAD; |
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return; |
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} |
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if (isexpos(s)) { |
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rh->expos *= exposval(s); |
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return; |
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} |
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if (isprims(s)) { |
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primsval(rh->mypri, s); |
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rh->primp = rh->mypri; |
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return; |
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} |
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} |
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|
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|
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int |
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tmLoadPicture(lpp, cpp, xp, yp, fname, fp) /* convert Radiance picture */ |
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TMbright **lpp; |
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BYTE **cpp; |
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int *xp, *yp; |
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char *fname; |
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FILE *fp; |
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{ |
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char *funcName = fname==NULL ? "tmLoadPicture" : fname; |
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FILE *inpf; |
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struct radhead info; |
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int err; |
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COLR *scanin = NULL; |
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int i; |
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/* check arguments */ |
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if (tmTop == NULL) |
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returnErr(TM_E_TMINVAL); |
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if (lpp == NULL | xp == NULL | yp == NULL | |
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(fname == NULL & fp == TM_GETFILE)) |
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returnErr(TM_E_ILLEGAL); |
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*xp = *yp = 0; /* error precaution */ |
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if ((inpf = fp) == TM_GETFILE && (inpf = fopen(fname, "r")) == NULL) |
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returnErr(TM_E_BADFILE); |
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*lpp = NULL; |
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if (cpp != TM_NOCHROMP) *cpp = NULL; |
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info = rhdefault; /* get our header */ |
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getheader(inpf, headline, (MEM_PTR)&info); |
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if (info.format == FMTBAD | info.expos <= 0. || |
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fgetresolu(xp, yp, inpf) < 0) { |
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err = TM_E_BADFILE; goto done; |
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} |
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if (info.format == FMTUNK) /* assume RGBE format */ |
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info.format = FMTRGB; |
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if (info.format == FMTRGB) |
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info.expos /= WHTEFFICACY; |
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else if (info.format == FMTCIE) |
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info.primp = TM_XYZPRIM; |
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/* prepare library */ |
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if ((err = tmSetSpace(info.primp, 1./info.expos)) != TM_E_OK) |
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goto done; |
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err = TM_E_NOMEM; /* allocate arrays */ |
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*lpp = (TMbright *)malloc(sizeof(TMbright) * *xp * *yp); |
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if (*lpp == NULL) |
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goto done; |
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if (cpp != TM_NOCHROMP) { |
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*cpp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
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if (*cpp == NULL) |
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goto done; |
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} |
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scanin = (COLR *)malloc(sizeof(COLR) * *xp); |
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if (scanin == NULL) |
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goto done; |
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err = TM_E_BADFILE; /* read & convert scanlines */ |
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for (i = 0; i < *yp; i++) { |
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if (freadcolrs(scanin, *xp, inpf) < 0) { |
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err = TM_E_BADFILE; break; |
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} |
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err = tmCvColrs(*lpp + (i * *xp), |
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cpp==TM_NOCHROMP ? TM_NOCHROM : *cpp + (i * 3 * *xp), |
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scanin, *xp); |
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if (err != TM_E_OK) |
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break; |
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} |
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done: /* clean up */ |
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if (fp == NULL) |
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fclose(inpf); |
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if (scanin != NULL) |
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free((MEM_PTR)scanin); |
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if (err != TM_E_OK) { |
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if (*lpp != NULL) |
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free((MEM_PTR)*lpp); |
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if (cpp != TM_NOCHROMP && *cpp != NULL) |
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free((MEM_PTR)*cpp); |
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returnErr(err); |
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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 /* run pcond to map picture */ |
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dopcond(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname) |
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BYTE **psp; |
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int *xp, *yp; |
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int flags; |
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RGBPRIMP monpri; |
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double gamval, Lddyn, Ldmax; |
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char *fname; |
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{ |
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char *funcName = fname; |
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char cmdbuf[512]; |
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FILE *infp; |
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register COLR *scan; |
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register BYTE *rp; |
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int y; |
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register int x; |
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/* set up gamma correction */ |
259 |
if (setcolrcor(pow, 1./gamval) < 0) |
260 |
returnErr(TM_E_NOMEM); |
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/* create command */ |
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strcpy(cmdbuf, "pcond "); |
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if (flags & TM_F_HCONTR) |
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strcat(cmdbuf, "-s "); |
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if (flags & TM_F_MESOPIC) |
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strcat(cmdbuf, "-c "); |
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if (flags & TM_F_LINEAR) |
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strcat(cmdbuf, "-l "); |
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if (flags & TM_F_ACUITY) |
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strcat(cmdbuf, "-a "); |
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if (flags & TM_F_VEIL) |
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strcat(cmdbuf, "-v "); |
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if (flags & TM_F_CWEIGHT) |
274 |
strcat(cmdbuf, "-w "); |
275 |
sprintf(cmdbuf+strlen(cmdbuf), |
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"-p %f %f %f %f %f %f %f %f -d %f -u %f %s", |
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monpri[RED][CIEX], monpri[RED][CIEY], |
278 |
monpri[GRN][CIEX], monpri[GRN][CIEY], |
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monpri[BLU][CIEX], monpri[BLU][CIEY], |
280 |
monpri[WHT][CIEX], monpri[WHT][CIEY], |
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Lddyn, Ldmax, fname); |
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/* start pcond */ |
283 |
if ((infp = popen(cmdbuf, "r")) == NULL) |
284 |
returnErr(TM_E_BADFILE); |
285 |
/* check picture format and size */ |
286 |
if (checkheader(infp, COLRFMT, NULL) < 0 || |
287 |
fgetresolu(xp, yp, infp) < 0) { |
288 |
pclose(infp); |
289 |
returnErr(TM_E_BADFILE); |
290 |
} |
291 |
/* allocate arrays */ |
292 |
scan = (COLR *)malloc(sizeof(COLR) * *xp); |
293 |
if (flags & TM_F_BW) |
294 |
rp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
295 |
else |
296 |
rp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
297 |
if ((*psp = rp) == NULL | scan == NULL) { |
298 |
pclose(infp); |
299 |
returnErr(TM_E_NOMEM); |
300 |
} |
301 |
/* read and gamma map file */ |
302 |
for (y = 0; y < *yp; y++) { |
303 |
if (freadcolrs(scan, *xp, infp) < 0) { |
304 |
pclose(infp); |
305 |
free((MEM_PTR)scan); |
306 |
free((MEM_PTR)*psp); |
307 |
*psp = NULL; |
308 |
returnErr(TM_E_BADFILE); |
309 |
} |
310 |
colrs_gambs(scan, *xp); |
311 |
if (flags & TM_F_BW) |
312 |
for (x = 0; x < *xp; x++) |
313 |
*rp++ = normbright(scan[x]); |
314 |
else |
315 |
for (x = 0; x < *xp; x++) { |
316 |
*rp++ = scan[x][RED]; |
317 |
*rp++ = scan[x][GRN]; |
318 |
*rp++ = scan[x][BLU]; |
319 |
} |
320 |
} |
321 |
free((MEM_PTR)scan); |
322 |
pclose(infp); |
323 |
returnOK; |
324 |
} |
325 |
|
326 |
|
327 |
int /* map a Radiance picture */ |
328 |
tmMapPicture(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname, fp) |
329 |
BYTE **psp; |
330 |
int *xp, *yp; |
331 |
int flags; |
332 |
RGBPRIMP monpri; |
333 |
double gamval, Lddyn, Ldmax; |
334 |
char *fname; |
335 |
FILE *fp; |
336 |
{ |
337 |
char *funcName = fname==NULL ? "tmMapPicture" : fname; |
338 |
BYTE *cp; |
339 |
TMbright *lp; |
340 |
int err; |
341 |
/* check arguments */ |
342 |
if (psp == NULL | xp == NULL | yp == NULL | monpri == NULL | |
343 |
(fname == NULL & fp == TM_GETFILE)) |
344 |
returnErr(TM_E_ILLEGAL); |
345 |
/* set defaults */ |
346 |
if (gamval < MINGAM) gamval = DEFGAM; |
347 |
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
348 |
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
349 |
if (flags & TM_F_BW) monpri = stdprims; |
350 |
/* check for pcond run */ |
351 |
if (fp == TM_GETFILE && flags & TM_F_UNIMPL) |
352 |
return( dopcond(psp, xp, yp, flags, |
353 |
monpri, gamval, Lddyn, Ldmax, fname) ); |
354 |
/* initialize tone mapping */ |
355 |
if (tmInit(flags, monpri, gamval) == NULL) |
356 |
returnErr(TM_E_NOMEM); |
357 |
/* load & convert picture */ |
358 |
err = tmLoadPicture(&lp, (flags&TM_F_BW) ? TM_NOCHROMP : &cp, |
359 |
xp, yp, fname, fp); |
360 |
if (err != TM_E_OK) { |
361 |
tmDone(NULL); |
362 |
return(err); |
363 |
} |
364 |
/* allocate space for result */ |
365 |
if (flags & TM_F_BW) { |
366 |
*psp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
367 |
if (*psp == NULL) { |
368 |
free((MEM_PTR)lp); |
369 |
tmDone(NULL); |
370 |
returnErr(TM_E_NOMEM); |
371 |
} |
372 |
cp = TM_NOCHROM; |
373 |
} else |
374 |
*psp = cp; |
375 |
/* compute color mapping */ |
376 |
err = tmAddHisto(lp, *xp * *yp, 1); |
377 |
if (err != TM_E_OK) |
378 |
goto done; |
379 |
err = tmComputeMapping(gamval, Lddyn, Ldmax); |
380 |
if (err != TM_E_OK) |
381 |
goto done; |
382 |
/* map colors */ |
383 |
err = tmMapPixels(*psp, lp, cp, *xp * *yp); |
384 |
|
385 |
done: /* clean up */ |
386 |
free((MEM_PTR)lp); |
387 |
tmDone(NULL); |
388 |
if (err != TM_E_OK) { /* free memory on error */ |
389 |
free((MEM_PTR)*psp); |
390 |
*psp = NULL; |
391 |
returnErr(err); |
392 |
} |
393 |
returnOK; |
394 |
} |
395 |
|
396 |
|
397 |
static void |
398 |
colrNewSpace(tms) /* color space changed for tone mapping */ |
399 |
register struct tmStruct *tms; |
400 |
{ |
401 |
register COLRDATA *cd; |
402 |
double d; |
403 |
|
404 |
cd = (COLRDATA *)tms->pd[colrReg]; |
405 |
cd->clfb[RED] = 256.*tms->clf[RED] + .5; |
406 |
cd->clfb[GRN] = 256.*tms->clf[GRN] + .5; |
407 |
cd->clfb[BLU] = 256.*tms->clf[BLU] + .5; |
408 |
cd->clfb[EXP] = COLXS; |
409 |
d = TM_BRTSCALE*log(tms->inpsf); |
410 |
cd->inpsfb = d<0. ? d-.5 : d+.5; |
411 |
} |
412 |
|
413 |
|
414 |
static MEM_PTR |
415 |
colrInit(tms) /* initialize private data for tone mapping */ |
416 |
register struct tmStruct *tms; |
417 |
{ |
418 |
register COLRDATA *cd; |
419 |
register int i; |
420 |
/* allocate our data */ |
421 |
cd = (COLRDATA *)malloc(sizeof(COLRDATA)); |
422 |
if (cd == NULL) |
423 |
return(NULL); |
424 |
tms->pd[colrReg] = (MEM_PTR)cd; |
425 |
/* compute gamma table */ |
426 |
for (i = GAMTSZ; i--; ) |
427 |
cd->gamb[i] = 256.*pow((i+.5)/GAMTSZ, 1./tms->mongam); |
428 |
/* compute color and scale factors */ |
429 |
colrNewSpace(tms); |
430 |
return((MEM_PTR)cd); |
431 |
} |