| 1 |
gwlarson |
3.4 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
greg |
3.1 |
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| 3 |
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#ifndef lint |
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gwlarson |
3.4 |
static char SCCSid[] = "$SunId$ SGI"; |
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greg |
3.1 |
#endif |
| 6 |
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| 7 |
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/* |
| 8 |
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* Routines for tone mapping on Radiance RGBE and XYZE pictures. |
| 9 |
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* See tonemap.h for detailed function descriptions. |
| 10 |
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*/ |
| 11 |
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| 12 |
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#include <stdio.h> |
| 13 |
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#include <math.h> |
| 14 |
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#include "tmprivat.h" |
| 15 |
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#include "resolu.h" |
| 16 |
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| 17 |
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| 18 |
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extern char *tempbuffer(); |
| 19 |
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| 20 |
greg |
3.3 |
#define GAMTSZ 1024 |
| 21 |
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| 22 |
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typedef struct { |
| 23 |
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BYTE gamb[GAMTSZ]; /* gamma lookup table */ |
| 24 |
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COLR clfb; /* encoded tm->clf */ |
| 25 |
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TMbright inpsfb; /* encoded tm->inpsf */ |
| 26 |
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} COLRDATA; |
| 27 |
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| 28 |
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static MEM_PTR colrInit(); |
| 29 |
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static void colrNewSpace(); |
| 30 |
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extern void free(); |
| 31 |
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static struct tmPackage colrPkg = { /* our package functions */ |
| 32 |
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colrInit, colrNewSpace, free |
| 33 |
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}; |
| 34 |
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static int colrReg = -1; /* our package registration number */ |
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| 36 |
greg |
3.1 |
#define LOGISZ 260 |
| 37 |
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static TMbright logi[LOGISZ]; |
| 38 |
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static BYTE photofact[BMESUPPER-BMESLOWER]; |
| 39 |
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| 40 |
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| 41 |
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int |
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gwlarson |
3.6 |
tmCvColrs(ls, cs, scan, len) /* convert RGBE/XYZE colors */ |
| 43 |
greg |
3.1 |
TMbright *ls; |
| 44 |
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BYTE *cs; |
| 45 |
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COLR *scan; |
| 46 |
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int len; |
| 47 |
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{ |
| 48 |
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static char funcName[] = "tmCvColrs"; |
| 49 |
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COLR cmon; |
| 50 |
greg |
3.3 |
register COLRDATA *cd; |
| 51 |
greg |
3.1 |
register int i, bi, li; |
| 52 |
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| 53 |
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if (tmTop == NULL) |
| 54 |
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returnErr(TM_E_TMINVAL); |
| 55 |
gwlarson |
3.4 |
if (ls == NULL | scan == NULL | len < 0) |
| 56 |
greg |
3.1 |
returnErr(TM_E_ILLEGAL); |
| 57 |
greg |
3.3 |
if (tmNeedMatrix(tmTop)) { /* need floating point */ |
| 58 |
greg |
3.1 |
register COLOR *newscan; |
| 59 |
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newscan = (COLOR *)tempbuffer(len*sizeof(COLOR)); |
| 60 |
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if (newscan == NULL) |
| 61 |
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returnErr(TM_E_NOMEM); |
| 62 |
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for (i = len; i--; ) |
| 63 |
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colr_color(newscan[i], scan[i]); |
| 64 |
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return(tmCvColors(ls, cs, newscan, len)); |
| 65 |
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} |
| 66 |
gwlarson |
3.6 |
if (colrReg < 0) { /* build tables if necessary */ |
| 67 |
greg |
3.3 |
colrReg = tmRegPkg(&colrPkg); |
| 68 |
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if (colrReg < 0) |
| 69 |
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returnErr(TM_E_CODERR1); |
| 70 |
greg |
3.1 |
for (i = 256; i--; ) |
| 71 |
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logi[i] = TM_BRTSCALE*log((i+.5)/256.) - .5; |
| 72 |
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for (i = 256; i < LOGISZ; i++) |
| 73 |
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logi[i] = logi[255]; |
| 74 |
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for (i = BMESLOWER; i < BMESUPPER; i++) |
| 75 |
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photofact[i-BMESLOWER] = 256. * |
| 76 |
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(tmLuminance(i) - LMESLOWER) / |
| 77 |
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(LMESUPPER - LMESLOWER); |
| 78 |
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} |
| 79 |
greg |
3.3 |
if ((cd = (COLRDATA *)tmPkgData(tmTop,colrReg)) == NULL) |
| 80 |
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returnErr(TM_E_NOMEM); |
| 81 |
greg |
3.1 |
for (i = len; i--; ) { |
| 82 |
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copycolr(cmon, scan[i]); |
| 83 |
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/* world luminance */ |
| 84 |
greg |
3.3 |
li = ( cd->clfb[RED]*cmon[RED] + |
| 85 |
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cd->clfb[GRN]*cmon[GRN] + |
| 86 |
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cd->clfb[BLU]*cmon[BLU] ) >> 8; |
| 87 |
greg |
3.1 |
bi = BRT2SCALE*(cmon[EXP]-COLXS) + |
| 88 |
greg |
3.3 |
logi[li] + cd->inpsfb; |
| 89 |
greg |
3.1 |
if (bi < MINBRT) { |
| 90 |
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bi = MINBRT-1; /* bogus value */ |
| 91 |
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li++; /* avoid li==0 */ |
| 92 |
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} |
| 93 |
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ls[i] = bi; |
| 94 |
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if (cs == TM_NOCHROM) /* no color? */ |
| 95 |
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continue; |
| 96 |
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/* mesopic adj. */ |
| 97 |
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if (tmTop->flags & TM_F_MESOPIC && bi < BMESUPPER) { |
| 98 |
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register int pf, sli = normscot(cmon); |
| 99 |
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if (bi < BMESLOWER) |
| 100 |
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cmon[RED] = cmon[GRN] = cmon[BLU] = sli; |
| 101 |
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else { |
| 102 |
gwlarson |
3.8 |
if (tmTop->flags & TM_F_BW) |
| 103 |
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cmon[RED] = cmon[GRN] = cmon[BLU] = li; |
| 104 |
greg |
3.1 |
pf = photofact[bi-BMESLOWER]; |
| 105 |
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sli *= 256 - pf; |
| 106 |
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cmon[RED] = ( sli + pf*cmon[RED] ) >> 8; |
| 107 |
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cmon[GRN] = ( sli + pf*cmon[GRN] ) >> 8; |
| 108 |
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cmon[BLU] = ( sli + pf*cmon[BLU] ) >> 8; |
| 109 |
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} |
| 110 |
gwlarson |
3.8 |
} else if (tmTop->flags & TM_F_BW) { |
| 111 |
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cmon[RED] = cmon[GRN] = cmon[BLU] = li; |
| 112 |
greg |
3.1 |
} |
| 113 |
greg |
3.3 |
bi = ( (int4)GAMTSZ*cd->clfb[RED]*cmon[RED]/li ) >> 8; |
| 114 |
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cs[3*i ] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
| 115 |
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bi = ( (int4)GAMTSZ*cd->clfb[GRN]*cmon[GRN]/li ) >> 8; |
| 116 |
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cs[3*i+1] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
| 117 |
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bi = ( (int4)GAMTSZ*cd->clfb[BLU]*cmon[BLU]/li ) >> 8; |
| 118 |
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cs[3*i+2] = bi>=GAMTSZ ? 255 : cd->gamb[bi]; |
| 119 |
greg |
3.1 |
} |
| 120 |
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returnOK; |
| 121 |
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} |
| 122 |
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| 123 |
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| 124 |
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#define FMTRGB 1 /* Input is RGBE */ |
| 125 |
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#define FMTCIE 2 /* Input is CIE XYZE */ |
| 126 |
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#define FMTUNK 3 /* Input format is unspecified */ |
| 127 |
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#define FMTBAD 4 /* Input is not a recognized format */ |
| 128 |
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| 129 |
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static struct radhead { |
| 130 |
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int format; /* FMTRGB, FMTCIE, FMTUNK, FMTBAD */ |
| 131 |
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double expos; /* input exposure value */ |
| 132 |
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RGBPRIMP primp; /* input primaries */ |
| 133 |
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RGBPRIMS mypri; /* custom primaries */ |
| 134 |
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} rhdefault = {FMTUNK, 1., stdprims, STDPRIMS}; |
| 135 |
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| 136 |
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| 137 |
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static int |
| 138 |
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headline(s, rh) /* grok a header line */ |
| 139 |
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register char *s; |
| 140 |
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register struct radhead *rh; |
| 141 |
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{ |
| 142 |
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char fmt[32]; |
| 143 |
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| 144 |
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if (formatval(fmt, s)) { |
| 145 |
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if (!strcmp(fmt, COLRFMT)) |
| 146 |
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rh->format = FMTRGB; |
| 147 |
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else if (!strcmp(fmt, CIEFMT)) |
| 148 |
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rh->format = FMTCIE; |
| 149 |
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else |
| 150 |
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rh->format = FMTBAD; |
| 151 |
gwlarson |
3.7 |
return(0); |
| 152 |
greg |
3.1 |
} |
| 153 |
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if (isexpos(s)) { |
| 154 |
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rh->expos *= exposval(s); |
| 155 |
gwlarson |
3.7 |
return(0); |
| 156 |
greg |
3.1 |
} |
| 157 |
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if (isprims(s)) { |
| 158 |
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primsval(rh->mypri, s); |
| 159 |
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rh->primp = rh->mypri; |
| 160 |
gwlarson |
3.7 |
return(0); |
| 161 |
greg |
3.1 |
} |
| 162 |
gwlarson |
3.7 |
return(0); |
| 163 |
greg |
3.1 |
} |
| 164 |
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| 165 |
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| 166 |
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int |
| 167 |
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tmLoadPicture(lpp, cpp, xp, yp, fname, fp) /* convert Radiance picture */ |
| 168 |
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TMbright **lpp; |
| 169 |
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BYTE **cpp; |
| 170 |
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int *xp, *yp; |
| 171 |
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char *fname; |
| 172 |
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FILE *fp; |
| 173 |
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{ |
| 174 |
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char *funcName = fname==NULL ? "tmLoadPicture" : fname; |
| 175 |
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FILE *inpf; |
| 176 |
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struct radhead info; |
| 177 |
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int err; |
| 178 |
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COLR *scanin = NULL; |
| 179 |
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int i; |
| 180 |
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/* check arguments */ |
| 181 |
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if (tmTop == NULL) |
| 182 |
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returnErr(TM_E_TMINVAL); |
| 183 |
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if (lpp == NULL | xp == NULL | yp == NULL | |
| 184 |
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(fname == NULL & fp == TM_GETFILE)) |
| 185 |
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returnErr(TM_E_ILLEGAL); |
| 186 |
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*xp = *yp = 0; /* error precaution */ |
| 187 |
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if ((inpf = fp) == TM_GETFILE && (inpf = fopen(fname, "r")) == NULL) |
| 188 |
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returnErr(TM_E_BADFILE); |
| 189 |
gwlarson |
3.6 |
*lpp = NULL; |
| 190 |
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if (cpp != TM_NOCHROMP) *cpp = NULL; |
| 191 |
greg |
3.1 |
info = rhdefault; /* get our header */ |
| 192 |
gwlarson |
3.6 |
getheader(inpf, headline, (MEM_PTR)&info); |
| 193 |
greg |
3.1 |
if (info.format == FMTBAD | info.expos <= 0. || |
| 194 |
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fgetresolu(xp, yp, inpf) < 0) { |
| 195 |
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err = TM_E_BADFILE; goto done; |
| 196 |
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} |
| 197 |
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if (info.format == FMTUNK) /* assume RGBE format */ |
| 198 |
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info.format = FMTRGB; |
| 199 |
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if (info.format == FMTRGB) |
| 200 |
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info.expos /= WHTEFFICACY; |
| 201 |
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else if (info.format == FMTCIE) |
| 202 |
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info.primp = TM_XYZPRIM; |
| 203 |
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/* prepare library */ |
| 204 |
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if ((err = tmSetSpace(info.primp, 1./info.expos)) != TM_E_OK) |
| 205 |
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goto done; |
| 206 |
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err = TM_E_NOMEM; /* allocate arrays */ |
| 207 |
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*lpp = (TMbright *)malloc(sizeof(TMbright) * *xp * *yp); |
| 208 |
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if (*lpp == NULL) |
| 209 |
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goto done; |
| 210 |
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if (cpp != TM_NOCHROMP) { |
| 211 |
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*cpp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
| 212 |
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if (*cpp == NULL) |
| 213 |
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goto done; |
| 214 |
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} |
| 215 |
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scanin = (COLR *)malloc(sizeof(COLR) * *xp); |
| 216 |
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if (scanin == NULL) |
| 217 |
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goto done; |
| 218 |
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err = TM_E_BADFILE; /* read & convert scanlines */ |
| 219 |
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for (i = 0; i < *yp; i++) { |
| 220 |
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if (freadcolrs(scanin, *xp, inpf) < 0) { |
| 221 |
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err = TM_E_BADFILE; break; |
| 222 |
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} |
| 223 |
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err = tmCvColrs(*lpp + (i * *xp), |
| 224 |
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cpp==TM_NOCHROMP ? TM_NOCHROM : *cpp + (i * 3 * *xp), |
| 225 |
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scanin, *xp); |
| 226 |
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if (err != TM_E_OK) |
| 227 |
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break; |
| 228 |
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} |
| 229 |
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done: /* clean up */ |
| 230 |
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if (fp == NULL) |
| 231 |
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fclose(inpf); |
| 232 |
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if (scanin != NULL) |
| 233 |
gwlarson |
3.6 |
free((MEM_PTR)scanin); |
| 234 |
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if (err != TM_E_OK) { |
| 235 |
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if (*lpp != NULL) |
| 236 |
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free((MEM_PTR)*lpp); |
| 237 |
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if (cpp != TM_NOCHROMP && *cpp != NULL) |
| 238 |
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free((MEM_PTR)*cpp); |
| 239 |
greg |
3.1 |
returnErr(err); |
| 240 |
gwlarson |
3.6 |
} |
| 241 |
greg |
3.1 |
returnOK; |
| 242 |
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} |
| 243 |
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| 244 |
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| 245 |
gwlarson |
3.9 |
#ifdef PCOND |
| 246 |
greg |
3.1 |
int /* run pcond to map picture */ |
| 247 |
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dopcond(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname) |
| 248 |
|
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BYTE **psp; |
| 249 |
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int *xp, *yp; |
| 250 |
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int flags; |
| 251 |
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RGBPRIMP monpri; |
| 252 |
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double gamval, Lddyn, Ldmax; |
| 253 |
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char *fname; |
| 254 |
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{ |
| 255 |
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char *funcName = fname; |
| 256 |
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char cmdbuf[512]; |
| 257 |
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FILE *infp; |
| 258 |
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register COLR *scan; |
| 259 |
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register BYTE *rp; |
| 260 |
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int y; |
| 261 |
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register int x; |
| 262 |
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/* set up gamma correction */ |
| 263 |
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if (setcolrcor(pow, 1./gamval) < 0) |
| 264 |
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returnErr(TM_E_NOMEM); |
| 265 |
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/* create command */ |
| 266 |
gwlarson |
3.9 |
strcpy(cmdbuf, PCOND); |
| 267 |
greg |
3.1 |
if (flags & TM_F_HCONTR) |
| 268 |
gwlarson |
3.9 |
strcat(cmdbuf, " -s"); |
| 269 |
greg |
3.1 |
if (flags & TM_F_MESOPIC) |
| 270 |
gwlarson |
3.9 |
strcat(cmdbuf, " -c"); |
| 271 |
greg |
3.1 |
if (flags & TM_F_LINEAR) |
| 272 |
gwlarson |
3.9 |
strcat(cmdbuf, " -l"); |
| 273 |
greg |
3.1 |
if (flags & TM_F_ACUITY) |
| 274 |
gwlarson |
3.9 |
strcat(cmdbuf, " -a"); |
| 275 |
greg |
3.1 |
if (flags & TM_F_VEIL) |
| 276 |
gwlarson |
3.9 |
strcat(cmdbuf, " -v"); |
| 277 |
greg |
3.1 |
if (flags & TM_F_CWEIGHT) |
| 278 |
gwlarson |
3.9 |
strcat(cmdbuf, " -w"); |
| 279 |
|
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if (monpri != stdprims) |
| 280 |
|
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sprintf(cmdbuf+strlen(cmdbuf), " -p %f %f %f %f %f %f %f %f", |
| 281 |
|
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monpri[RED][CIEX], monpri[RED][CIEY], |
| 282 |
|
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monpri[GRN][CIEX], monpri[GRN][CIEY], |
| 283 |
|
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monpri[BLU][CIEX], monpri[BLU][CIEY], |
| 284 |
|
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monpri[WHT][CIEX], monpri[WHT][CIEY]); |
| 285 |
|
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sprintf(cmdbuf+strlen(cmdbuf), " -d %f -u %f %s", Lddyn, Ldmax, fname); |
| 286 |
greg |
3.1 |
/* start pcond */ |
| 287 |
|
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if ((infp = popen(cmdbuf, "r")) == NULL) |
| 288 |
|
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returnErr(TM_E_BADFILE); |
| 289 |
|
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/* check picture format and size */ |
| 290 |
|
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if (checkheader(infp, COLRFMT, NULL) < 0 || |
| 291 |
|
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fgetresolu(xp, yp, infp) < 0) { |
| 292 |
|
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pclose(infp); |
| 293 |
|
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returnErr(TM_E_BADFILE); |
| 294 |
|
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} |
| 295 |
|
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/* allocate arrays */ |
| 296 |
greg |
3.2 |
scan = (COLR *)malloc(sizeof(COLR) * *xp); |
| 297 |
greg |
3.1 |
if (flags & TM_F_BW) |
| 298 |
|
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rp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
| 299 |
|
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else |
| 300 |
|
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rp = (BYTE *)malloc(3*sizeof(BYTE) * *xp * *yp); |
| 301 |
|
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if ((*psp = rp) == NULL | scan == NULL) { |
| 302 |
|
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pclose(infp); |
| 303 |
|
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returnErr(TM_E_NOMEM); |
| 304 |
|
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} |
| 305 |
|
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/* read and gamma map file */ |
| 306 |
|
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for (y = 0; y < *yp; y++) { |
| 307 |
|
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if (freadcolrs(scan, *xp, infp) < 0) { |
| 308 |
|
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pclose(infp); |
| 309 |
gwlarson |
3.6 |
free((MEM_PTR)scan); |
| 310 |
|
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free((MEM_PTR)*psp); |
| 311 |
greg |
3.2 |
*psp = NULL; |
| 312 |
greg |
3.1 |
returnErr(TM_E_BADFILE); |
| 313 |
|
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} |
| 314 |
|
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colrs_gambs(scan, *xp); |
| 315 |
|
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if (flags & TM_F_BW) |
| 316 |
|
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for (x = 0; x < *xp; x++) |
| 317 |
|
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*rp++ = normbright(scan[x]); |
| 318 |
|
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else |
| 319 |
|
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for (x = 0; x < *xp; x++) { |
| 320 |
|
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*rp++ = scan[x][RED]; |
| 321 |
|
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*rp++ = scan[x][GRN]; |
| 322 |
|
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*rp++ = scan[x][BLU]; |
| 323 |
|
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} |
| 324 |
|
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} |
| 325 |
gwlarson |
3.6 |
free((MEM_PTR)scan); |
| 326 |
greg |
3.1 |
pclose(infp); |
| 327 |
|
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returnOK; |
| 328 |
|
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} |
| 329 |
gwlarson |
3.9 |
#endif |
| 330 |
greg |
3.1 |
|
| 331 |
|
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| 332 |
|
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int /* map a Radiance picture */ |
| 333 |
|
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tmMapPicture(psp, xp, yp, flags, monpri, gamval, Lddyn, Ldmax, fname, fp) |
| 334 |
|
|
BYTE **psp; |
| 335 |
|
|
int *xp, *yp; |
| 336 |
|
|
int flags; |
| 337 |
|
|
RGBPRIMP monpri; |
| 338 |
|
|
double gamval, Lddyn, Ldmax; |
| 339 |
|
|
char *fname; |
| 340 |
|
|
FILE *fp; |
| 341 |
|
|
{ |
| 342 |
|
|
char *funcName = fname==NULL ? "tmMapPicture" : fname; |
| 343 |
|
|
BYTE *cp; |
| 344 |
|
|
TMbright *lp; |
| 345 |
|
|
int err; |
| 346 |
|
|
/* check arguments */ |
| 347 |
|
|
if (psp == NULL | xp == NULL | yp == NULL | monpri == NULL | |
| 348 |
|
|
(fname == NULL & fp == TM_GETFILE)) |
| 349 |
|
|
returnErr(TM_E_ILLEGAL); |
| 350 |
|
|
/* set defaults */ |
| 351 |
|
|
if (gamval < MINGAM) gamval = DEFGAM; |
| 352 |
|
|
if (Lddyn < MINLDDYN) Lddyn = DEFLDDYN; |
| 353 |
|
|
if (Ldmax < MINLDMAX) Ldmax = DEFLDMAX; |
| 354 |
|
|
if (flags & TM_F_BW) monpri = stdprims; |
| 355 |
gwlarson |
3.9 |
#ifdef PCOND |
| 356 |
greg |
3.1 |
/* check for pcond run */ |
| 357 |
|
|
if (fp == TM_GETFILE && flags & TM_F_UNIMPL) |
| 358 |
|
|
return( dopcond(psp, xp, yp, flags, |
| 359 |
|
|
monpri, gamval, Lddyn, Ldmax, fname) ); |
| 360 |
gwlarson |
3.9 |
#endif |
| 361 |
greg |
3.1 |
/* initialize tone mapping */ |
| 362 |
|
|
if (tmInit(flags, monpri, gamval) == NULL) |
| 363 |
|
|
returnErr(TM_E_NOMEM); |
| 364 |
|
|
/* load & convert picture */ |
| 365 |
|
|
err = tmLoadPicture(&lp, (flags&TM_F_BW) ? TM_NOCHROMP : &cp, |
| 366 |
|
|
xp, yp, fname, fp); |
| 367 |
|
|
if (err != TM_E_OK) { |
| 368 |
|
|
tmDone(NULL); |
| 369 |
|
|
return(err); |
| 370 |
|
|
} |
| 371 |
|
|
/* allocate space for result */ |
| 372 |
|
|
if (flags & TM_F_BW) { |
| 373 |
|
|
*psp = (BYTE *)malloc(sizeof(BYTE) * *xp * *yp); |
| 374 |
greg |
3.2 |
if (*psp == NULL) { |
| 375 |
gwlarson |
3.6 |
free((MEM_PTR)lp); |
| 376 |
greg |
3.2 |
tmDone(NULL); |
| 377 |
greg |
3.1 |
returnErr(TM_E_NOMEM); |
| 378 |
greg |
3.2 |
} |
| 379 |
greg |
3.1 |
cp = TM_NOCHROM; |
| 380 |
|
|
} else |
| 381 |
|
|
*psp = cp; |
| 382 |
|
|
/* compute color mapping */ |
| 383 |
|
|
err = tmAddHisto(lp, *xp * *yp, 1); |
| 384 |
|
|
if (err != TM_E_OK) |
| 385 |
|
|
goto done; |
| 386 |
|
|
err = tmComputeMapping(gamval, Lddyn, Ldmax); |
| 387 |
|
|
if (err != TM_E_OK) |
| 388 |
|
|
goto done; |
| 389 |
|
|
/* map colors */ |
| 390 |
|
|
err = tmMapPixels(*psp, lp, cp, *xp * *yp); |
| 391 |
|
|
|
| 392 |
|
|
done: /* clean up */ |
| 393 |
gwlarson |
3.6 |
free((MEM_PTR)lp); |
| 394 |
greg |
3.1 |
tmDone(NULL); |
| 395 |
|
|
if (err != TM_E_OK) { /* free memory on error */ |
| 396 |
gwlarson |
3.6 |
free((MEM_PTR)*psp); |
| 397 |
greg |
3.1 |
*psp = NULL; |
| 398 |
|
|
returnErr(err); |
| 399 |
|
|
} |
| 400 |
|
|
returnOK; |
| 401 |
greg |
3.3 |
} |
| 402 |
|
|
|
| 403 |
|
|
|
| 404 |
|
|
static void |
| 405 |
|
|
colrNewSpace(tms) /* color space changed for tone mapping */ |
| 406 |
|
|
register struct tmStruct *tms; |
| 407 |
|
|
{ |
| 408 |
|
|
register COLRDATA *cd; |
| 409 |
|
|
double d; |
| 410 |
|
|
|
| 411 |
|
|
cd = (COLRDATA *)tms->pd[colrReg]; |
| 412 |
|
|
cd->clfb[RED] = 256.*tms->clf[RED] + .5; |
| 413 |
|
|
cd->clfb[GRN] = 256.*tms->clf[GRN] + .5; |
| 414 |
|
|
cd->clfb[BLU] = 256.*tms->clf[BLU] + .5; |
| 415 |
|
|
cd->clfb[EXP] = COLXS; |
| 416 |
|
|
d = TM_BRTSCALE*log(tms->inpsf); |
| 417 |
|
|
cd->inpsfb = d<0. ? d-.5 : d+.5; |
| 418 |
|
|
} |
| 419 |
|
|
|
| 420 |
|
|
|
| 421 |
|
|
static MEM_PTR |
| 422 |
|
|
colrInit(tms) /* initialize private data for tone mapping */ |
| 423 |
|
|
register struct tmStruct *tms; |
| 424 |
|
|
{ |
| 425 |
|
|
register COLRDATA *cd; |
| 426 |
|
|
register int i; |
| 427 |
|
|
/* allocate our data */ |
| 428 |
|
|
cd = (COLRDATA *)malloc(sizeof(COLRDATA)); |
| 429 |
|
|
if (cd == NULL) |
| 430 |
|
|
return(NULL); |
| 431 |
|
|
tms->pd[colrReg] = (MEM_PTR)cd; |
| 432 |
|
|
/* compute gamma table */ |
| 433 |
|
|
for (i = GAMTSZ; i--; ) |
| 434 |
|
|
cd->gamb[i] = 256.*pow((i+.5)/GAMTSZ, 1./tms->mongam); |
| 435 |
|
|
/* compute color and scale factors */ |
| 436 |
|
|
colrNewSpace(tms); |
| 437 |
|
|
return((MEM_PTR)cd); |
| 438 |
greg |
3.1 |
} |
