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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Routines for tone-mapping 16-bit/primary pixels
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*
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* Externals declared in tonemap.h
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*/
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#include "copyright.h"
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#include <stdio.h>
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#include <math.h>
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#include "tmprivat.h"
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#define LOGTABBITS 11 /* log table is 1<<LOGTABBITS long */
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#define GAMTABBITS 9 /* gamma table is 1<<GAMTABBITS long */
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static float logtab[1<<LOGTABBITS];
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static float gamtab[1<<GAMTABBITS];
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static float gammul[16];
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static double cur_gam = 0.;
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#define imultpow2(i,s) ((s)>=0 ? (i)<<(s) : (i)>>-(s))
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/* Fill our log table */
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static void
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mkLogTable()
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{
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int i;
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if (logtab[0] != 0.f)
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return;
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for (i = 1<<LOGTABBITS; i--; )
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logtab[i] = log(imultpow2(i,15-LOGTABBITS)*(1./(1L<<16))
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+ .5);
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}
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/* Fill our gamma table */
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static void
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mkGamTable(double gv)
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{
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int i;
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if (gv == cur_gam)
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return;
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for (i = 1<<GAMTABBITS; i--; )
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gamtab[i] = pow((i+.5)*(1./(1<<GAMTABBITS)), gv);
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for (i = 16; i--; )
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gammul[i] = pow((double)(1L<<i), -gv);
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cur_gam = gv;
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}
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/* Find normalizing shift value for a 2-byte unsigned integer */
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static int
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normShift16(int i)
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{
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int s = 0;
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while (!(i & 0x8000)) {
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i <<= 1;
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++s;
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}
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return(s);
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}
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/* Find common normalizing shift for 3 2-byte unsigned integers */
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static int
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normShift48(uint16 clr48[3])
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{
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int imax = (clr48[1] > clr48[0] ? clr48[1] : clr48[0]);
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if (clr48[2] > imax)
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imax = clr48[2];
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return(normShift16(imax));
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}
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/* convert at 48-bit tristimulus value to a COLOR */
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static void
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rgb48_color(COLOR col, uint16 clr48[3])
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{
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int nshft;
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if (cur_gam == 1.) { /* linear case */
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col[0] = clr48[0]*(1./(1L<<16));
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col[1] = clr48[1]*(1./(1L<<16));
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col[2] = clr48[2]*(1./(1L<<16));
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return;
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}
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/* non-linear case */
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nshft = normShift48(clr48);
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col[0] = gamtab[imultpow2(clr48[0],GAMTABBITS-16+nshft)] *
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gammul[nshft];
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col[1] = gamtab[imultpow2(clr48[1],GAMTABBITS-16+nshft)] *
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gammul[nshft];
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col[2] = gamtab[imultpow2(clr48[2],GAMTABBITS-16+nshft)] *
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gammul[nshft];
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}
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/* Convert 16-bit gray scanline to encoded luminance */
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int
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tmCvGray16(TMbright *ls, uint16 *scan, int len, double gv)
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{
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static char funcName[] = "tmCvGray16";
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static double cur_inpsf = 1.;
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static double log_inpsf = 0.;
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int nshft;
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double d;
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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 | gv <= MINGAM)
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returnErr(TM_E_ILLEGAL);
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/* initialize log table */
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if (logtab[0] == 0.f)
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mkLogTable();
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if (cur_inpsf != tmTop->inpsf)
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log_inpsf = log(cur_inpsf = tmTop->inpsf);
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/* convert 16-bit grays */
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while (len--) {
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nshft = normShift16(*scan);
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d = logtab[ imultpow2(*scan,LOGTABBITS-15+nshft) &
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((1L<<LOGTABBITS)-1) ]
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- M_LN2*nshft;
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d = (double)TM_BRTSCALE * (gv*d + log_inpsf);
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*ls++ = (d>0. ? d+.5 : d-.5);
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scan++;
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}
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returnOK;
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}
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/* Convert a 48-bit RGB scanline to encoded luminance/chrominance */
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int
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tmCvRGB48(TMbright *ls, BYTE *cs, uint16 (*scan)[3], int len, double gv)
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{
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static char funcName[] = "tmCvRGB48";
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static double cur_inpsf = 1.;
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static double log_inpsf = 0.;
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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 | gv <= MINGAM)
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returnErr(TM_E_ILLEGAL);
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/* update gamma table */
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if (gv != 1. & gv != cur_gam)
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mkGamTable(gv);
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#if 0
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if (tmNeedMatrix(tmTop)) { /* need floating point */
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#else
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{
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#endif
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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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rgb48_color(newscan[i], scan[i]);
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return(tmCvColors(ls, cs, newscan, len));
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}
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#if 0
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/* initialize log table */
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if (logtab[0] == 0.f)
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mkLogTable();
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if (cur_inpsf != tmTop->inpsf)
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log_inpsf = log(cur_inpsf = tmTop->inpsf);
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/* convert scanline */
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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 (li <= 0) {
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bi = TM_NOBRT; /* bogus value */
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li = 1; /* 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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/* mesopic adj. */
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if (tmTop->flags & TM_F_MESOPIC && bi < BMESUPPER) {
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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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if (tmTop->flags & TM_F_BW)
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cmon[RED] = cmon[GRN] = cmon[BLU] = li;
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pf = tmMesofact[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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} else if (tmTop->flags & TM_F_BW) {
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cmon[RED] = cmon[GRN] = cmon[BLU] = li;
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}
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bi = ( (int32)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 = ( (int32)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 = ( (int32)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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#endif
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}
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