static AMBHEMI *
samp_hemi( /* sample indirect hemisphere */
COLOR rcol,
RAY *r,
double wt
)
{
AMBHEMI *hp;
double d;
int n, i, j;
/* insignificance check */
if (bright(rcol) <= FTINY)
return(NULL);
/* set number of divisions */
if (ambacc <= FTINY &&
wt > (d = 0.8*intens(rcol)*r->rweight/(ambdiv*minweight)))
wt = d; /* avoid ray termination */
n = sqrt(ambdiv * wt) + 0.5;
i = 1 + 5*(ambacc > FTINY); /* minimum number of samples */
if (n < i)
n = i;
/* allocate sampling array */
hp = (AMBHEMI *)malloc(sizeof(AMBHEMI) + sizeof(AMBSAMP)*(n*n - 1));
if (hp == NULL)
error(SYSTEM, "out of memory in samp_hemi");
hp->rp = r;
hp->ns = n;
hp->acol[RED] = hp->acol[GRN] = hp->acol[BLU] = 0.0;
memset(hp->sa, 0, sizeof(AMBSAMP)*n*n);
hp->sampOK = 0;
/* assign coefficient */
copycolor(hp->acoef, rcol);
d = 1.0/(n*n);
scalecolor(hp->acoef, d);
/* make tangent plane axes */
if (!getperpendicular(hp->ux, r->ron, 1))
error(CONSISTENCY, "bad ray direction in samp_hemi");
VCROSS(hp->uy, r->ron, hp->ux);
/* sample divisions */
for (i = hp->ns; i--; )
for (j = hp->ns; j--; )
hp->sampOK += ambsample(hp, i, j, 0);
copycolor(rcol, hp->acol);
if (!hp->sampOK) { /* utter failure? */
free(hp);
return(NULL);
}
if (hp->sampOK < hp->ns*hp->ns) {
hp->sampOK *= -1; /* soft failure */
return(hp);
}
if (hp->sampOK < 64)
return(hp); /* insufficient for super-sampling */
n = ambssamp*wt + 0.5;
if (n > 8) { /* perform super-sampling? */
ambsupersamp(hp, n);
copycolor(rcol, hp->acol);
}
return(hp); /* all is well */
}
/* Get ray contribution from previous file */
static int
get_contrib(DCOLOR cnt, FILE *finp)
{
COLOR fv;
COLR cv;
switch (outfmt) {
case 'a':
return(fscanf(finp,"%lf %lf %lf",&cnt[0],&cnt[1],&cnt[2]) == 3);
case 'f':
if (fread(fv, sizeof(fv[0]), 3, finp) != 3)
return(0);
copycolor(cnt, fv);
return(1);
case 'd':
return(fread(cnt, sizeof(cnt[0]), 3, finp) == 3);
case 'c':
if (fread(cv, sizeof(cv), 1, finp) != 1)
return(0);
colr_color(fv, cv);
copycolor(cnt, fv);
return(1);
default:
error(INTERNAL, "botched output format");
}
return(0); /* pro forma return */
}
/* write out matrix to file (precede by resolution string if picture) */
int
cm_write(const CMATRIX *cm, int dtype, FILE *fp)
{
static const char tabEOL[2] = {'\t','\n'};
const COLORV *mp = cm->cmem;
int r, c;
switch (dtype) {
case DTascii:
for (r = 0; r < cm->nrows; r++)
for (c = 0; c < cm->ncols; c++, mp += 3)
fprintf(fp, "%.6e %.6e %.6e%c",
mp[0], mp[1], mp[2],
tabEOL[c >= cm->ncols-1]);
break;
case DTfloat:
case DTdouble:
if (sizeof(COLOR) == cm_elem_size[dtype]) {
r = cm->ncols*cm->nrows;
while (r > 0) {
c = putbinary(mp, sizeof(COLOR), r, fp);
if (c <= 0)
return(0);
mp += 3*c;
r -= c;
}
} else if (dtype == DTdouble) {
double dc[3];
r = cm->ncols*cm->nrows;
while (r--) {
copycolor(dc, mp);
if (putbinary(dc, sizeof(double), 3, fp) != 3)
return(0);
mp += 3;
}
} else /* dtype == DTfloat */ {
float fc[3];
r = cm->ncols*cm->nrows;
while (r--) {
copycolor(fc, mp);
if (putbinary(fc, sizeof(float), 3, fp) != 3)
return(0);
mp += 3;
}
}
break;
case DTrgbe:
case DTxyze:
fprtresolu(cm->ncols, cm->nrows, fp);
for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols)
if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0)
return(0);
break;
default:
fputs("Unsupported data type in cm_write()!\n", stderr);
return(0);
}
return(fflush(fp) == 0);
}
extern int
raymixture( /* mix modifiers */
RAY *r,
OBJECT fore,
OBJECT back,
double coef
)
{
RAY fr, br;
int foremat, backmat;
int i;
/* bound coefficient */
if (coef > 1.0)
coef = 1.0;
else if (coef < 0.0)
coef = 0.0;
/* compute foreground and background */
foremat = backmat = 0;
/* foreground */
fr = *r;
if (coef > FTINY) {
fr.rweight *= coef;
scalecolor(fr.rcoef, coef);
foremat = rayshade(&fr, fore);
}
/* background */
br = *r;
if (coef < 1.0-FTINY) {
br.rweight *= 1.0-coef;
scalecolor(br.rcoef, 1.0-coef);
backmat = rayshade(&br, back);
}
/* check for transparency */
if (backmat ^ foremat) {
if (backmat && coef > FTINY)
raytrans(&fr);
else if (foremat && coef < 1.0-FTINY)
raytrans(&br);
}
/* mix perturbations */
for (i = 0; i < 3; i++)
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i];
/* mix pattern colors */
scalecolor(fr.pcol, coef);
scalecolor(br.pcol, 1.0-coef);
copycolor(r->pcol, fr.pcol);
addcolor(r->pcol, br.pcol);
/* return value tells if material */
if (!foremat & !backmat)
return(0);
/* mix returned ray values */
scalecolor(fr.rcol, coef);
scalecolor(br.rcol, 1.0-coef);
copycolor(r->rcol, fr.rcol);
addcolor(r->rcol, br.rcol);
r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt;
return(1);
}
static void
dirashik( /* compute source contribution */
COLOR cval, /* returned coefficient */
void *nnp, /* material data */
FVECT ldir, /* light source direction */
double omega /* light source size */
)
{
ASHIKDAT *np = nnp;
double ldot;
double dtmp, dtmp1, dtmp2;
FVECT h;
COLOR ctmp;
setcolor(cval, 0.0, 0.0, 0.0);
ldot = DOT(np->pnorm, ldir);
if (ldot < 0.0)
return; /* wrong side */
/*
* Compute and add diffuse reflected component to returned
* color.
*/
copycolor(ctmp, np->mcolor);
dtmp = ldot * omega * (1.0/PI) * (1. - schlick_fres(ldot));
scalecolor(ctmp, dtmp);
addcolor(cval, ctmp);
if ((np->specfl & (SPA_REFL|SPA_BADU)) != SPA_REFL)
return;
/*
* Compute specular reflection coefficient
*/
/* half vector */
VSUB(h, ldir, np->rp->rdir);
normalize(h);
/* ellipse */
dtmp1 = DOT(np->u, h);
dtmp1 *= dtmp1 * np->u_power;
dtmp2 = DOT(np->v, h);
dtmp2 *= dtmp2 * np->v_power;
/* Ashikhmin-Shirley model*/
dtmp = DOT(np->pnorm, h);
dtmp = pow(dtmp, (dtmp1+dtmp2)/(1.-dtmp*dtmp));
dtmp *= sqrt((np->u_power+1.)*(np->v_power+1.));
dtmp /= 8.*PI * DOT(ldir,h) * MAX(ldot,np->pdot);
/* worth using? */
if (dtmp > FTINY) {
copycolor(ctmp, np->scolor);
dtmp *= ldot * omega;
scalecolor(ctmp, dtmp);
addcolor(cval, ctmp);
}
}
static void
picdebug(void) /* put out debugging picture */
{
static COLOR blkcol = BLKCOLOR;
COLOR *scan;
int y, i;
register int x, rg;
if (fseek(stdin, 0L, 0) == EOF) {
fprintf(stderr, "%s: cannot seek on input picture\n", progname);
exit(1);
}
getheader(stdin, NULL, NULL); /* skip input header */
fgetresolu(&xmax, &ymax, stdin);
/* allocate scanline */
scan = (COLOR *)malloc(xmax*sizeof(COLOR));
if (scan == NULL) {
perror(progname);
exit(1);
}
/* finish debug header */
fputformat(COLRFMT, debugfp);
putc('\n', debugfp);
fprtresolu(xmax, ymax, debugfp);
/* write debug picture */
for (y = ymax-1; y >= 0; y--) {
if (freadscan(scan, xmax, stdin) < 0) {
fprintf(stderr, "%s: error rereading input picture\n",
progname);
exit(1);
}
for (x = 0; x < xmax; x++) {
rg = chartndx(x, y, &i);
if (rg == RG_CENT) {
if (!(1L<<i & gmtflags) || (x+y)&07) {
copycolor(scan[x], mbRGB[i]);
clipgamut(scan[x], bright(scan[x]),
CGAMUT, colmin, colmax);
} else
copycolor(scan[x], blkcol);
} else if (rg == RG_CORR)
cvtcolor(scan[x], scan[x]);
else if (rg != RG_ORIG)
copycolor(scan[x], blkcol);
}
if (fwritescan(scan, xmax, debugfp) < 0) {
fprintf(stderr, "%s: error writing debugging picture\n",
progname);
exit(1);
}
}
/* clean up */
fclose(debugfp);
free((void *)scan);
}
int
freadscan( /* read in a scanline */
COLOR *scanline,
int len,
FILE *fp
)
{
COLR *clrscan;
if ((clrscan = (COLR *)tempbuffer(len*sizeof(COLR))) == NULL)
return(-1);
if (freadcolrs(clrscan, len, fp) < 0)
return(-1);
/* convert scanline */
colr_color(scanline[0], clrscan[0]);
while (--len > 0) {
scanline++; clrscan++;
if (clrscan[0][GRN] == clrscan[-1][GRN] &&
(clrscan[0][RED] == clrscan[-1][RED]) &
(clrscan[0][BLU] == clrscan[-1][BLU]) &
(clrscan[0][EXP] == clrscan[-1][EXP]))
copycolor(scanline[0], scanline[-1]);
else
colr_color(scanline[0], clrscan[0]);
}
return(0);
}
int
m_aniso( /* anisotropic material */
register OBJREC *o
)
{
register MATREC *m;
/* check arguments */
if (o->oargs.nfargs < (o->otype == MAT_TRANS2 ? 8 : 6))
objerror(o, USER, "bad # of real arguments");
/* allocate/insert material */
m = newmaterial(o->oname);
/* assign parameters */
setcolor(m->u.m.ambdiff, o->oargs.farg[0],
o->oargs.farg[1], o->oargs.farg[2]);
if ((m->type = o->otype) == MAT_METAL2)
copycolor(m->u.m.specular, m->u.m.ambdiff);
else
setcolor(m->u.m.specular, 1., 1., 1.);
scalecolor(m->u.m.specular, o->oargs.farg[3]);
scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[3]);
if (m->type == MAT_TRANS2) {
scalecolor(m->u.m.specular, 1.-o->oargs.farg[6]);
scalecolor(m->u.m.ambdiff, 1.-o->oargs.farg[6]);
}
if (o->oargs.farg[4]*o->oargs.farg[5] <= FTINY*FTINY)
m->u.m.specexp = MAXSPECEXP;
else
m->u.m.specexp = 2./(o->oargs.farg[4]*o->oargs.farg[5]);
if (m->u.m.specexp > MAXSPECEXP)
m->u.m.specexp = MAXSPECEXP;
return(0);
}
extern void
extambient( /* extrapolate value at pv, nv */
COLOR cr,
AMBVAL *ap,
FVECT pv,
FVECT nv
)
{
FVECT v1;
int i;
double d;
d = 1.0; /* zeroeth order */
/* gradient due to translation */
for (i = 0; i < 3; i++)
d += ap->gpos[i]*(pv[i]-ap->pos[i]);
/* gradient due to rotation */
VCROSS(v1, ap->dir, nv);
d += DOT(ap->gdir, v1);
if (d <= 0.0) {
setcolor(cr, 0.0, 0.0, 0.0);
return;
}
copycolor(cr, ap->val);
scalecolor(cr, d);
}
/* Put out ray contribution to file */
static void
put_contrib(const DCOLOR cnt, FILE *fout)
{
double sf = 1;
COLOR fv;
COLR cv;
if (accumulate > 1)
sf = 1./(double)accumulate;
switch (outfmt) {
case 'a':
if (accumulate > 1)
fprintf(fout, "%.6e\t%.6e\t%.6e\t",
sf*cnt[0], sf*cnt[1], sf*cnt[2]);
else
fprintf(fout, "%.6e\t%.6e\t%.6e\t",
cnt[0], cnt[1], cnt[2]);
break;
case 'f':
if (accumulate > 1) {
copycolor(fv, cnt);
scalecolor(fv, sf);
} else
copycolor(fv, cnt);
fwrite(fv, sizeof(float), 3, fout);
break;
case 'd':
if (accumulate > 1) {
DCOLOR dv;
copycolor(dv, cnt);
scalecolor(dv, sf);
fwrite(dv, sizeof(double), 3, fout);
} else
fwrite(cnt, sizeof(double), 3, fout);
break;
case 'c':
if (accumulate > 1)
setcolr(cv, sf*cnt[0], sf*cnt[1], sf*cnt[2]);
else
setcolr(cv, cnt[0], cnt[1], cnt[2]);
fwrite(cv, sizeof(cv), 1, fout);
break;
default:
error(INTERNAL, "botched output format");
}
}
void
pcopy( /* copy paint node p1 into p2 */
PNODE *p1,
PNODE *p2
)
{
copycolor(p2->v, p1->v);
p2->x = p1->x;
p2->y = p1->y;
}
/* Multiply two matrices (or a matrix and a vector) and allocate the result */
CMATRIX *
cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
{
char *rowcheck=NULL, *colcheck=NULL;
CMATRIX *cmr;
int dr, dc, i;
if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
cmr = cm_alloc(cm1->nrows, cm2->ncols);
if (cmr == NULL)
return(NULL);
/* optimization: check for zero rows & cols */
if (((cm1->nrows > 5) | (cm2->ncols > 5)) & (cm1->ncols > 5)) {
static const COLOR czero;
rowcheck = (char *)calloc(cmr->nrows, 1);
for (dr = cm1->nrows*(rowcheck != NULL); dr--; )
for (dc = cm1->ncols; dc--; )
if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) {
rowcheck[dr] = 1;
break;
}
colcheck = (char *)calloc(cmr->ncols, 1);
for (dc = cm2->ncols*(colcheck != NULL); dc--; )
for (dr = cm2->nrows; dr--; )
if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) {
colcheck[dc] = 1;
break;
}
}
for (dr = 0; dr < cmr->nrows; dr++)
for (dc = 0; dc < cmr->ncols; dc++) {
COLORV *dp = cm_lval(cmr,dr,dc);
double res[3];
dp[0] = dp[1] = dp[2] = 0;
if (rowcheck != NULL && !rowcheck[dr])
continue;
if (colcheck != NULL && !colcheck[dc])
continue;
res[0] = res[1] = res[2] = 0;
for (i = 0; i < cm1->ncols; i++) {
const COLORV *cp1 = cm_lval(cm1,dr,i);
const COLORV *cp2 = cm_lval(cm2,i,dc);
res[0] += (double)cp1[0] * cp2[0];
res[1] += (double)cp1[1] * cp2[1];
res[2] += (double)cp1[2] * cp2[2];
}
copycolor(dp, res);
}
if (rowcheck != NULL) free(rowcheck);
if (colcheck != NULL) free(colcheck);
return(cmr);
}
extern void
raytrans( /* transmit ray as is */
RAY *r
)
{
RAY tr;
if (rayorigin(&tr, TRANS, r, NULL) == 0) {
VCOPY(tr.rdir, r->rdir);
rayvalue(&tr);
copycolor(r->rcol, tr.rcol);
r->rt = r->rot + tr.rt;
}
}
static double
greypoint( /* compute gamut mapping grey target */
COLOR col
)
{
COLOR gryc;
int i;
/* improves saturated color rendering */
copycolor(gryc, col);
for (i = 3; i--; )
if (gryc[i] > 1)
gryc[i] = 1;
else if (gryc[i] < 0)
gryc[i] = 0;
return(bright(gryc));
}
static void
vips_rad2float_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
{
COLR *inp = (COLR *) in[0];
COLOR *outbuf = (COLOR *) out;
colr_color(outbuf[0], inp[0]);
while (--width > 0) {
outbuf++; inp++;
if (inp[0][RED] == inp[-1][RED] &&
inp[0][GRN] == inp[-1][GRN] &&
inp[0][BLU] == inp[-1][BLU] &&
inp[0][EXP] == inp[-1][EXP])
copycolor(outbuf[0], outbuf[-1]);
else
colr_color(outbuf[0], inp[0]);
}
}
int
waitrays(void) /* finish up pending rays */
{
int nwaited = 0;
int rval;
RAY raydone;
if (!ray_pnprocs) /* immediate mode? */
return(0);
while ((rval = ray_presult(&raydone, 0)) > 0) {
PNODE *p = (PNODE *)raydone.rno;
copycolor(p->v, raydone.rcol);
scalecolor(p->v, exposure);
recolor(p);
nwaited++;
}
if (rval < 0)
return(-1);
return(nwaited);
}
extern double
makeambient( /* make a new ambient value for storage */
COLOR acol,
RAY *r,
FVECT rn,
int al
)
{
AMBVAL amb;
FVECT gp, gd;
int i;
amb.weight = 1.0; /* compute weight */
for (i = al; i-- > 0; )
amb.weight *= AVGREFL;
if (r->rweight < 0.1*amb.weight) /* heuristic override */
amb.weight = 1.25*r->rweight;
setcolor(acol, AVGREFL, AVGREFL, AVGREFL);
/* compute ambient */
amb.rad = doambient(acol, r, amb.weight, gp, gd);
if (amb.rad <= FTINY) {
setcolor(acol, 0.0, 0.0, 0.0);
return(0.0);
}
scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */
/* store value */
VCOPY(amb.pos, r->rop);
VCOPY(amb.dir, r->ron);
amb.lvl = al;
copycolor(amb.val, acol);
VCOPY(amb.gpos, gp);
VCOPY(amb.gdir, gd);
/* insert into tree */
avsave(&amb); /* and save to file */
if (rn != r->ron)
extambient(acol, &amb, r->rop, rn); /* texture */
return(amb.rad);
}
static void
starpoint( /* pixel is on the star's point */
COLOR fcol,
int x,
int y,
register HOTPIX *hp
)
{
COLOR ctmp;
double d2;
d2 = (double)(x - hp->x)*(x - hp->x) + (double)(y - hp->y)*(y - hp->y);
if (d2 > sprdfact) {
d2 = sprdfact / d2;
if (d2 < FTINY)
return;
copycolor(ctmp, hp->val);
scalecolor(ctmp, d2);
addcolor(fcol, ctmp);
} else if (d2 > FTINY) {
addcolor(fcol, hp->val);
}
}
static inline void
split_patch(pdf_tensorpatch *s0, pdf_tensorpatch *s1, const pdf_tensorpatch *p)
{
split_curve_s(&p->pole[0][0], &s0->pole[0][0], &s1->pole[0][0], 4);
split_curve_s(&p->pole[0][1], &s0->pole[0][1], &s1->pole[0][1], 4);
split_curve_s(&p->pole[0][2], &s0->pole[0][2], &s1->pole[0][2], 4);
split_curve_s(&p->pole[0][3], &s0->pole[0][3], &s1->pole[0][3], 4);
copycolor(s0->color[0], p->color[0]);
midcolor(s0->color[1], p->color[0], p->color[1]);
midcolor(s0->color[2], p->color[2], p->color[3]);
copycolor(s0->color[3], p->color[3]);
copycolor(s1->color[0], s0->color[1]);
copycolor(s1->color[1], p->color[1]);
copycolor(s1->color[2], p->color[2]);
copycolor(s1->color[3], s0->color[2]);
}
extern void
dogauss( /* gaussian filter */
COLOR csum,
int xcent,
int ycent,
int c,
int r
)
{
double dy, dx, weight, wsum;
COLOR ctmp;
int y;
register int x, offs;
register COLOR *scan;
wsum = FTINY;
setcolor(csum, 0.0, 0.0, 0.0);
for (y = ycent-yrad; y <= ycent+yrad; y++) {
if (y < 0) continue;
if (y >= yres) break;
dy = (y_r*(y+.5) - (r+.5))/rad;
scan = scanin[y%barsize];
for (x = xcent-xrad; x <= xcent+xrad; x++) {
offs = x < 0 ? xres : x >= xres ? -xres : 0;
if (offs && !wrapfilt)
continue;
dx = (x_c*(x+.5) - (c+.5))/rad;
weight = lookgauss(dx*dx + dy*dy);
wsum += weight;
copycolor(ctmp, scan[x+offs]);
scalecolor(ctmp, weight);
addcolor(csum, ctmp);
}
}
weight = 1.0/wsum;
scalecolor(csum, weight);
}
extern void
pass1scan( /* process first pass scanline */
register COLOR *scan,
int y
)
{
double cbrt;
register int x;
register HOTPIX *hp;
for (x = 0; x < xres; x++) {
cbrt = (*ourbright)(scan[x]);
if (cbrt <= 0)
continue;
if (avghot || cbrt < hotlvl) {
avgbrt += cbrt;
npix++;
}
if (npts && cbrt >= hotlvl) {
hp = (HOTPIX *)malloc(sizeof(HOTPIX));
if (hp == NULL) {
fprintf(stderr, "%s: out of memory\n",
progname);
quit(1);
}
copycolor(hp->val, scan[x]);
hp->x = x;
hp->y = y;
hp->slope = tan(PI*(0.5-(random()%npts+0.5)/npts));
hp->next = head;
head = hp;
}
}
}
static inline void
split_stripe(pdf_tensorpatch *s0, pdf_tensorpatch *s1, const pdf_tensorpatch *p)
{
split_curve_s(p->pole[0], s0->pole[0], s1->pole[0], 1);
split_curve_s(p->pole[1], s0->pole[1], s1->pole[1], 1);
split_curve_s(p->pole[2], s0->pole[2], s1->pole[2], 1);
split_curve_s(p->pole[3], s0->pole[3], s1->pole[3], 1);
copycolor(s0->color[0], p->color[0]);
copycolor(s0->color[1], p->color[1]);
midcolor(s0->color[2], p->color[1], p->color[2]);
midcolor(s0->color[3], p->color[0], p->color[3]);
copycolor(s1->color[0], s0->color[3]);
copycolor(s1->color[1], s0->color[2]);
copycolor(s1->color[2], p->color[2]);
copycolor(s1->color[3], p->color[3]);
}
static void
sumans( /* sum input pixel to output */
int px,
int py,
int rcent,
int ccent,
double m
)
{
double dy2, dx;
COLOR pval, ctmp;
int ksiz, r, offs;
double pc, pr, norm;
register int i, c;
register COLOR *scan;
/*
* This normalization method fails at the picture borders because
* a different number of input pixels contribute there.
*/
scan = scanin[py%barsize] + (px < 0 ? xres : px >= xres ? -xres : 0);
copycolor(pval, scan[px]);
pc = x_c*(px+.5);
pr = y_r*(py+.5);
ksiz = CHECKRAD*m*rad + 1;
if (ksiz > orad) ksiz = orad;
/* compute normalization */
norm = 0.0;
i = 0;
for (r = rcent-ksiz; r <= rcent+ksiz; r++) {
if (r < 0) continue;
if (r >= nrows) break;
dy2 = (pr - (r+.5))/(m*rad);
dy2 *= dy2;
for (c = ccent-ksiz; c <= ccent+ksiz; c++) {
if (!wrapfilt) {
if (c < 0) continue;
if (c >= ncols) break;
}
dx = (pc - (c+.5))/(m*rad);
norm += warr[i++] = lookgauss(dx*dx + dy2);
}
}
norm = 1.0/norm;
if (x_c < 1.0) norm *= x_c;
if (y_r < 1.0) norm *= y_r;
/* sum pixels */
i = 0;
for (r = rcent-ksiz; r <= rcent+ksiz; r++) {
if (r < 0) continue;
if (r >= nrows) break;
scan = scoutbar[r%obarsize];
for (c = ccent-ksiz; c <= ccent+ksiz; c++) {
offs = c < 0 ? ncols : c >= ncols ? -ncols : 0;
if (offs && !wrapfilt)
continue;
copycolor(ctmp, pval);
dx = norm*warr[i++];
scalecolor(ctmp, dx);
addcolor(scan[c+offs], ctmp);
}
}
}
static int
ambsample( /* initial ambient division sample */
AMBHEMI *hp,
int i,
int j,
int n
)
{
AMBSAMP *ap = &ambsam(hp,i,j);
RAY ar;
int hlist[3], ii;
double spt[2], zd;
/* generate hemispherical sample */
/* ambient coefficient for weight */
if (ambacc > FTINY)
setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL);
else
copycolor(ar.rcoef, hp->acoef);
if (rayorigin(&ar, AMBIENT, hp->rp, ar.rcoef) < 0)
return(0);
if (ambacc > FTINY) {
multcolor(ar.rcoef, hp->acoef);
scalecolor(ar.rcoef, 1./AVGREFL);
}
hlist[0] = hp->rp->rno;
hlist[1] = j;
hlist[2] = i;
multisamp(spt, 2, urand(ilhash(hlist,3)+n));
resample:
SDsquare2disk(spt, (j+spt[1])/hp->ns, (i+spt[0])/hp->ns);
zd = sqrt(1. - spt[0]*spt[0] - spt[1]*spt[1]);
for (ii = 3; ii--; )
ar.rdir[ii] = spt[0]*hp->ux[ii] +
spt[1]*hp->uy[ii] +
zd*hp->rp->ron[ii];
checknorm(ar.rdir);
/* avoid coincident samples */
if (!n && ambcollision(hp, i, j, ar.rdir)) {
spt[0] = frandom(); spt[1] = frandom();
goto resample; /* reject this sample */
}
dimlist[ndims++] = AI(hp,i,j) + 90171;
rayvalue(&ar); /* evaluate ray */
ndims--;
zd = raydistance(&ar);
if (zd <= FTINY)
return(0); /* should never happen */
multcolor(ar.rcol, ar.rcoef); /* apply coefficient */
if (zd*ap->d < 1.0) /* new/closer distance? */
ap->d = 1.0/zd;
if (!n) { /* record first vertex & value */
if (zd > 10.0*thescene.cusize + 1000.)
zd = 10.0*thescene.cusize + 1000.;
VSUM(ap->p, ar.rorg, ar.rdir, zd);
copycolor(ap->v, ar.rcol);
} else { /* else update recorded value */
hp->acol[RED] -= colval(ap->v,RED);
hp->acol[GRN] -= colval(ap->v,GRN);
hp->acol[BLU] -= colval(ap->v,BLU);
zd = 1.0/(double)(n+1);
scalecolor(ar.rcol, zd);
zd *= (double)n;
scalecolor(ap->v, zd);
addcolor(ap->v, ar.rcol);
}
addcolor(hp->acol, ap->v); /* add to our sum */
return(1);
}
extern void
direct( /* add direct component */
RAY *r, /* ray that hit surface */
srcdirf_t *f, /* direct component coefficient function */
void *p /* data for f */
)
{
register int sn;
register CONTRIB *scp;
SRCINDEX si;
int nshadcheck, ncnts;
int nhits;
double prob, ourthresh, hwt;
RAY sr;
/* NOTE: srccnt and cntord global so no recursion */
if (nsources <= 0)
return; /* no sources?! */
/* potential contributions */
initsrcindex(&si);
for (sn = 0; srcray(&sr, r, &si); sn++) {
if (sn >= maxcntr) {
maxcntr = sn + MAXSPART;
srccnt = (CONTRIB *)realloc((void *)srccnt,
maxcntr*sizeof(CONTRIB));
cntord = (CNTPTR *)realloc((void *)cntord,
maxcntr*sizeof(CNTPTR));
if ((srccnt == NULL) | (cntord == NULL))
error(SYSTEM, "out of memory in direct");
}
cntord[sn].sndx = sn;
scp = srccnt + sn;
scp->sno = sr.rsrc;
/* compute coefficient */
(*f)(scp->coef, p, sr.rdir, si.dom);
cntord[sn].brt = intens(scp->coef);
if (cntord[sn].brt <= 0.0)
continue;
#if SHADCACHE
/* check shadow cache */
if (si.np == 1 && srcblocked(&sr)) {
cntord[sn].brt = 0.0;
continue;
}
#endif
VCOPY(scp->dir, sr.rdir);
copycolor(sr.rcoef, scp->coef);
/* compute potential */
sr.revf = srcvalue;
rayvalue(&sr);
multcolor(sr.rcol, sr.rcoef);
copycolor(scp->val, sr.rcol);
cntord[sn].brt = bright(sr.rcol);
}
/* sort contributions */
qsort(cntord, sn, sizeof(CNTPTR), cntcmp);
{ /* find last */
register int l, m;
ncnts = l = sn;
sn = 0;
while ((m = (sn + ncnts) >> 1) != l) {
if (cntord[m].brt > 0.0)
sn = m;
else
ncnts = m;
l = m;
}
}
if (ncnts == 0)
return; /* no contributions! */
/* accumulate tail */
for (sn = ncnts-1; sn > 0; sn--)
cntord[sn-1].brt += cntord[sn].brt;
/* compute number to check */
nshadcheck = pow((double)ncnts, shadcert) + .5;
/* modify threshold */
ourthresh = shadthresh / r->rweight;
/* test for shadows */
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts;
hwt += (double)source[scp->sno].nhits /
(double)source[scp->sno].ntests,
sn++) {
/* check threshold */
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt :
cntord[sn].brt-cntord[sn+nshadcheck].brt)
< ourthresh*bright(r->rcol))
break;
scp = srccnt + cntord[sn].sndx;
/* test for hit */
rayorigin(&sr, SHADOW, r, NULL);
copycolor(sr.rcoef, scp->coef);
VCOPY(sr.rdir, scp->dir);
sr.rsrc = scp->sno;
/* keep statistics */
if (source[scp->sno].ntests++ > 0xfffffff0) {
source[scp->sno].ntests >>= 1;
source[scp->sno].nhits >>= 1;
}
if (localhit(&sr, &thescene) &&
( sr.ro != source[scp->sno].so ||
source[scp->sno].sflags & SFOLLOW )) {
/* follow entire path */
raycont(&sr);
if (trace != NULL)
(*trace)(&sr); /* trace execution */
if (bright(sr.rcol) <= FTINY) {
#if SHADCACHE
if ((scp <= srccnt || scp[-1].sno != scp->sno)
&& (scp >= srccnt+ncnts-1 ||
scp[1].sno != scp->sno))
srcblocker(&sr);
#endif
continue; /* missed! */
}
rayparticipate(&sr);
multcolor(sr.rcol, sr.rcoef);
copycolor(scp->val, sr.rcol);
} else if (trace != NULL &&
(source[scp->sno].sflags & (SDISTANT|SVIRTUAL|SFOLLOW))
== (SDISTANT|SFOLLOW) &&
sourcehit(&sr) && rayshade(&sr, sr.ro->omod)) {
(*trace)(&sr); /* trace execution */
/* skip call to rayparticipate() & scp->val update */
}
/* add contribution if hit */
addcolor(r->rcol, scp->val);
nhits++;
source[scp->sno].nhits++;
}
int
m_dielectric( /* color a ray which hit a dielectric interface */
OBJREC *m,
RAY *r
)
{
double cos1, cos2, nratio;
COLOR ctrans;
COLOR talb;
int hastexture;
int flatsurface;
double refl, trans;
FVECT dnorm;
double d1, d2;
RAY p;
int i;
/* PMAP: skip refracted shadow or ambient ray if accounted for in
photon map */
if (shadowRayInPmap(r) || ambRayInPmap(r))
return(1);
if (m->oargs.nfargs != (m->otype==MAT_DIELECTRIC ? 5 : 8))
objerror(m, USER, "bad arguments");
raytexture(r, m->omod); /* get modifiers */
if ( (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY) )
cos1 = raynormal(dnorm, r); /* perturb normal */
else {
VCOPY(dnorm, r->ron);
cos1 = r->rod;
}
flatsurface = r->ro != NULL && isflat(r->ro->otype) &&
!hastexture | (r->crtype & AMBIENT);
/* index of refraction */
if (m->otype == MAT_DIELECTRIC)
nratio = m->oargs.farg[3] + m->oargs.farg[4]/MLAMBDA;
else
nratio = m->oargs.farg[3] / m->oargs.farg[7];
if (cos1 < 0.0) { /* inside */
hastexture = -hastexture;
cos1 = -cos1;
dnorm[0] = -dnorm[0];
dnorm[1] = -dnorm[1];
dnorm[2] = -dnorm[2];
setcolor(r->cext, -mylog(m->oargs.farg[0]*colval(r->pcol,RED)),
-mylog(m->oargs.farg[1]*colval(r->pcol,GRN)),
-mylog(m->oargs.farg[2]*colval(r->pcol,BLU)));
setcolor(r->albedo, 0., 0., 0.);
r->gecc = 0.;
if (m->otype == MAT_INTERFACE) {
setcolor(ctrans,
-mylog(m->oargs.farg[4]*colval(r->pcol,RED)),
-mylog(m->oargs.farg[5]*colval(r->pcol,GRN)),
-mylog(m->oargs.farg[6]*colval(r->pcol,BLU)));
setcolor(talb, 0., 0., 0.);
} else {
copycolor(ctrans, cextinction);
copycolor(talb, salbedo);
}
} else { /* outside */
nratio = 1.0 / nratio;
setcolor(ctrans, -mylog(m->oargs.farg[0]*colval(r->pcol,RED)),
-mylog(m->oargs.farg[1]*colval(r->pcol,GRN)),
-mylog(m->oargs.farg[2]*colval(r->pcol,BLU)));
setcolor(talb, 0., 0., 0.);
if (m->otype == MAT_INTERFACE) {
setcolor(r->cext,
-mylog(m->oargs.farg[4]*colval(r->pcol,RED)),
-mylog(m->oargs.farg[5]*colval(r->pcol,GRN)),
-mylog(m->oargs.farg[6]*colval(r->pcol,BLU)));
setcolor(r->albedo, 0., 0., 0.);
r->gecc = 0.;
}
}
d2 = 1.0 - nratio*nratio*(1.0 - cos1*cos1); /* compute cos theta2 */
if (d2 < FTINY) /* total reflection */
refl = 1.0;
else { /* refraction occurs */
/* compute Fresnel's equations */
cos2 = sqrt(d2);
d1 = cos1;
d2 = nratio*cos2;
d1 = (d1 - d2) / (d1 + d2);
refl = d1 * d1;
d1 = 1.0 / cos1;
d2 = nratio / cos2;
d1 = (d1 - d2) / (d1 + d2);
refl += d1 * d1;
refl *= 0.5;
trans = 1.0 - refl;
trans *= nratio*nratio; /* solid angle ratio */
setcolor(p.rcoef, trans, trans, trans);
if (rayorigin(&p, REFRACTED, r, p.rcoef) == 0) {
/* compute refracted ray */
d1 = nratio*cos1 - cos2;
for (i = 0; i < 3; i++)
p.rdir[i] = nratio*r->rdir[i] + d1*dnorm[i];
/* accidental reflection? */
if (hastexture &&
DOT(p.rdir,r->ron)*hastexture >= -FTINY) {
d1 *= (double)hastexture;
for (i = 0; i < 3; i++) /* ignore texture */
p.rdir[i] = nratio*r->rdir[i] +
d1*r->ron[i];
normalize(p.rdir); /* not exact */
} else
checknorm(p.rdir);
#ifdef DISPERSE
if (m->otype != MAT_DIELECTRIC
|| r->rod > 0.0
|| r->crtype & SHADOW
|| !directvis
|| m->oargs.farg[4] == 0.0
|| !disperse(m, r, p.rdir,
trans, ctrans, talb))
#endif
{
copycolor(p.cext, ctrans);
copycolor(p.albedo, talb);
rayvalue(&p);
multcolor(p.rcol, p.rcoef);
addcolor(r->rcol, p.rcol);
/* virtual distance */
if (flatsurface ||
(1.-FTINY <= nratio) &
(nratio <= 1.+FTINY))
r->rxt = r->rot + raydistance(&p);
}
}
}
setcolor(p.rcoef, refl, refl, refl);
if (!(r->crtype & SHADOW) &&
rayorigin(&p, REFLECTED, r, p.rcoef) == 0) {
/* compute reflected ray */
VSUM(p.rdir, r->rdir, dnorm, 2.*cos1);
/* accidental penetration? */
if (hastexture && DOT(p.rdir,r->ron)*hastexture <= FTINY)
VSUM(p.rdir, r->rdir, r->ron, 2.*r->rod);
checknorm(p.rdir);
rayvalue(&p); /* reflected ray value */
multcolor(p.rcol, p.rcoef); /* color contribution */
copycolor(r->mcol, p.rcol);
addcolor(r->rcol, p.rcol);
/* virtual distance */
r->rmt = r->rot;
if (flatsurface)
r->rmt += raydistance(&p);
}
/* rayvalue() computes absorption */
return(1);
}
static int
disperse( /* check light sources for dispersion */
OBJREC *m,
RAY *r,
FVECT vt,
double tr,
COLOR cet,
COLOR abt
)
{
RAY sray;
const RAY *entray;
FVECT v1, v2, n1, n2;
FVECT dv, v2Xdv;
double v2Xdvv2Xdv;
int success = 0;
SRCINDEX si;
FVECT vtmp1, vtmp2;
double dtmp1, dtmp2;
int l1, l2;
COLOR ctmp;
int i;
/*
* This routine computes dispersion to the first order using
* the following assumptions:
*
* 1) The dependency of the index of refraction on wavelength
* is approximated by Hartmann's equation with lambda0
* equal to zero.
* 2) The entry and exit locations are constant with respect
* to dispersion.
*
* The second assumption permits us to model dispersion without
* having to sample refracted directions. We assume that the
* geometry inside the material is constant, and concern ourselves
* only with the relationship between the entering and exiting ray.
* We compute the first derivatives of the entering and exiting
* refraction with respect to the index of refraction. This
* is then used in a first order Taylor series to determine the
* index of refraction necessary to send the exiting ray to each
* light source.
* If an exiting ray hits a light source within the refraction
* boundaries, we sum all the frequencies over the disc of the
* light source to determine the resulting color. A smaller light
* source will therefore exhibit a sharper spectrum.
*/
if (!(r->crtype & REFRACTED)) { /* ray started in material */
VCOPY(v1, r->rdir);
n1[0] = -r->rdir[0]; n1[1] = -r->rdir[1]; n1[2] = -r->rdir[2];
} else {
/* find entry point */
for (entray = r; entray->rtype != REFRACTED;
entray = entray->parent)
;
entray = entray->parent;
if (entray->crtype & REFRACTED) /* too difficult */
return(0);
VCOPY(v1, entray->rdir);
VCOPY(n1, entray->ron);
}
VCOPY(v2, vt); /* exiting ray */
VCOPY(n2, r->ron);
/* first order dispersion approx. */
dtmp1 = 1./DOT(n1, v1);
dtmp2 = 1./DOT(n2, v2);
for (i = 0; i < 3; i++)
dv[i] = v1[i] + v2[i] - n1[i]*dtmp1 - n2[i]*dtmp2;
if (DOT(dv, dv) <= FTINY) /* null effect */
return(0);
/* compute plane normal */
fcross(v2Xdv, v2, dv);
v2Xdvv2Xdv = DOT(v2Xdv, v2Xdv);
/* check sources */
initsrcindex(&si);
while (srcray(&sray, r, &si)) {
if (DOT(sray.rdir, v2) < MINCOS)
continue; /* bad source */
/* adjust source ray */
dtmp1 = DOT(v2Xdv, sray.rdir) / v2Xdvv2Xdv;
sray.rdir[0] -= dtmp1 * v2Xdv[0];
sray.rdir[1] -= dtmp1 * v2Xdv[1];
sray.rdir[2] -= dtmp1 * v2Xdv[2];
l1 = lambda(m, v2, dv, sray.rdir); /* mean lambda */
if (l1 > MAXLAMBDA || l1 < MINLAMBDA) /* not visible */
continue;
/* trace source ray */
copycolor(sray.cext, cet);
copycolor(sray.albedo, abt);
normalize(sray.rdir);
rayvalue(&sray);
if (bright(sray.rcol) <= FTINY) /* missed it */
continue;
/*
* Compute spectral sum over diameter of source.
* First find directions for rays going to opposite
* sides of source, then compute wavelengths for each.
*/
fcross(vtmp1, v2Xdv, sray.rdir);
dtmp1 = sqrt(si.dom / v2Xdvv2Xdv / PI);
/* compute first ray */
VSUM(vtmp2, sray.rdir, vtmp1, dtmp1);
l1 = lambda(m, v2, dv, vtmp2); /* first lambda */
if (l1 < 0)
continue;
/* compute second ray */
VSUM(vtmp2, sray.rdir, vtmp1, -dtmp1);
l2 = lambda(m, v2, dv, vtmp2); /* second lambda */
if (l2 < 0)
continue;
/* compute color from spectrum */
if (l1 < l2)
spec_rgb(ctmp, l1, l2);
else
spec_rgb(ctmp, l2, l1);
multcolor(ctmp, sray.rcol);
scalecolor(ctmp, tr);
addcolor(r->rcol, ctmp);
success++;
}
return(success);
}
/* Load previously accumulated values */
void
reload_output()
{
int i, j;
MODCONT *mp;
int ofl;
char oname[1024];
char *fmode = "rb";
char *outvfmt;
LUENT *oent;
int xr, yr;
STREAMOUT sout;
DCOLOR rgbv;
if (outfmt == 'a')
fmode = "r";
outvfmt = formstr(outfmt);
/* reload modifier values */
for (i = 0; i < nmods; i++) {
mp = (MODCONT *)lu_find(&modconttab,modname[i])->data;
if (mp->outspec == NULL)
error(USER, "cannot reload from stdout");
if (mp->outspec[0] == '!')
error(USER, "cannot reload from command");
for (j = 0; ; j++) { /* load each modifier bin */
ofl = ofname(oname, mp->outspec, mp->modname, j);
if (ofl < 0)
error(USER, "bad output file specification");
oent = lu_find(&ofiletab, oname);
if (oent->data != NULL) {
sout = *(STREAMOUT *)oent->data;
} else {
sout.reclen = 0;
sout.outpipe = 0;
sout.xr = xres; sout.yr = yres;
sout.ofp = NULL;
}
if (sout.ofp == NULL) { /* open output as input */
sout.ofp = fopen(oname, fmode);
if (sout.ofp == NULL) {
if (j == mp->nbins)
break; /* assume end of modifier */
sprintf(errmsg, "missing reload file '%s'",
oname);
error(WARNING, errmsg);
break;
}
#ifdef getc_unlocked
flockfile(sout.ofp);
#endif
if (header && checkheader(sout.ofp, outvfmt, NULL) != 1) {
sprintf(errmsg, "format mismatch for '%s'",
oname);
error(USER, errmsg);
}
if ((sout.xr > 0) & (sout.yr > 0) &&
(!fscnresolu(&xr, &yr, sout.ofp) ||
(xr != sout.xr) |
(yr != sout.yr))) {
sprintf(errmsg, "resolution mismatch for '%s'",
oname);
error(USER, errmsg);
}
}
/* read in RGB value */
if (!get_contrib(rgbv, sout.ofp)) {
if (!j) {
fclose(sout.ofp);
break; /* ignore empty file */
}
if (j < mp->nbins) {
sprintf(errmsg, "missing data in '%s'",
oname);
error(USER, errmsg);
}
break;
}
if (j >= mp->nbins) { /* check modifier size */
sprintf(errmsg,
"mismatched -bn setting for reloading '%s'",
modname[i]);
error(USER, errmsg);
}
copycolor(mp->cbin[j], rgbv);
if (oent->key == NULL) /* new file entry */
oent->key = strcpy((char *)
malloc(strlen(oname)+1), oname);
if (oent->data == NULL)
oent->data = (char *)malloc(sizeof(STREAMOUT));
*(STREAMOUT *)oent->data = sout;
}
}
lu_doall(&ofiletab, &myclose, NULL); /* close all files */
}
static void
dirbrdf( /* compute source contribution */
COLOR cval, /* returned coefficient */
void *nnp, /* material data */
FVECT ldir, /* light source direction */
double omega /* light source size */
)
{
BRDFDAT *np = nnp;
double ldot;
double dtmp;
COLOR ctmp;
FVECT ldx;
static double vldx[5], pt[MAXDIM];
char **sa;
int i;
#define lddx (vldx+1)
setcolor(cval, 0.0, 0.0, 0.0);
ldot = DOT(np->pnorm, ldir);
if (ldot <= FTINY && ldot >= -FTINY)
return; /* too close to grazing */
if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY)
return; /* wrong side */
if (ldot > 0.0) {
/*
* Compute and add diffuse reflected component to returned
* color. The diffuse reflected component will always be
* modified by the color of the material.
*/
copycolor(ctmp, np->rdiff);
dtmp = ldot * omega / PI;
scalecolor(ctmp, dtmp);
addcolor(cval, ctmp);
} else {
/*
* Diffuse transmitted component.
*/
copycolor(ctmp, np->tdiff);
dtmp = -ldot * omega / PI;
scalecolor(ctmp, dtmp);
addcolor(cval, ctmp);
}
if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY)
return; /* diffuse only */
/* set up function */
setbrdfunc(np);
sa = np->mp->oargs.sarg;
errno = 0;
/* transform light vector */
multv3(ldx, ldir, funcxf.xfm);
for (i = 0; i < 3; i++)
lddx[i] = ldx[i]/funcxf.sca;
lddx[3] = omega;
/* compute BRTDF */
if (np->mp->otype == MAT_BRTDF) {
if (sa[6][0] == '0') /* special case */
colval(ctmp,RED) = 0.0;
else
colval(ctmp,RED) = funvalue(sa[6], 4, lddx);
if (sa[7][0] == '0')
colval(ctmp,GRN) = 0.0;
else if (!strcmp(sa[7],sa[6]))
colval(ctmp,GRN) = colval(ctmp,RED);
else
colval(ctmp,GRN) = funvalue(sa[7], 4, lddx);
if (!strcmp(sa[8],sa[6]))
colval(ctmp,BLU) = colval(ctmp,RED);
else if (!strcmp(sa[8],sa[7]))
colval(ctmp,BLU) = colval(ctmp,GRN);
else
colval(ctmp,BLU) = funvalue(sa[8], 4, lddx);
dtmp = bright(ctmp);
} else if (np->dp == NULL) {
dtmp = funvalue(sa[0], 4, lddx);
setcolor(ctmp, dtmp, dtmp, dtmp);
} else {
for (i = 0; i < np->dp->nd; i++)
pt[i] = funvalue(sa[3+i], 4, lddx);
vldx[0] = datavalue(np->dp, pt);
dtmp = funvalue(sa[0], 5, vldx);
setcolor(ctmp, dtmp, dtmp, dtmp);
}
if ((errno == EDOM) | (errno == ERANGE)) {
objerror(np->mp, WARNING, "compute error");
return;
}
if (dtmp <= FTINY)
return;
if (ldot > 0.0) {
/*
* Compute reflected non-diffuse component.
*/
if ((np->mp->otype == MAT_MFUNC) | (np->mp->otype == MAT_MDATA))
multcolor(ctmp, np->mcolor);
dtmp = ldot * omega * np->rspec;
scalecolor(ctmp, dtmp);
addcolor(cval, ctmp);
} else {
/*
* Compute transmitted non-diffuse component.
*/
if ((np->mp->otype == MAT_TFUNC) | (np->mp->otype == MAT_TDATA))
multcolor(ctmp, np->mcolor);
dtmp = -ldot * omega * np->tspec;
scalecolor(ctmp, dtmp);
addcolor(cval, ctmp);
}
#undef lddx
}
static void
pixtoval(void) /* convert picture to values */
{
register COLOR *scanln;
int dogamma;
COLOR lastc;
RREAL hv[2];
int startprim, endprim;
long startpos;
int y;
register int x;
scanln = (COLOR *)malloc(scanlen(&picres)*sizeof(COLOR));
if (scanln == NULL) {
fprintf(stderr, "%s: out of memory\n", progname);
quit(1);
}
dogamma = gamcor < .95 || gamcor > 1.05;
if (putprim == ALL && !interleave) {
startprim = RED; endprim = BLU;
startpos = ftell(fin);
} else {
startprim = putprim; endprim = putprim;
}
for (putprim = startprim; putprim <= endprim; putprim++) {
if (putprim != startprim && fseek(fin, startpos, 0)) {
fprintf(stderr, "%s: seek error on input file\n",
progname);
quit(1);
}
set_io();
setcolor(lastc, 0.0, 0.0, 0.0);
for (y = 0; y < numscans(&picres); y++) {
if (freadscan(scanln, scanlen(&picres), fin) < 0) {
fprintf(stderr, "%s: read error\n", progname);
quit(1);
}
for (x = 0; x < scanlen(&picres); x++) {
if (uniq) {
if ( colval(scanln[x],RED) ==
colval(lastc,RED) &&
colval(scanln[x],GRN) ==
colval(lastc,GRN) &&
colval(scanln[x],BLU) ==
colval(lastc,BLU) )
continue;
else
copycolor(lastc, scanln[x]);
}
if (doexposure)
multcolor(scanln[x], exposure);
if (dogamma)
setcolor(scanln[x],
pow(colval(scanln[x],RED), 1.0/gamcor),
pow(colval(scanln[x],GRN), 1.0/gamcor),
pow(colval(scanln[x],BLU), 1.0/gamcor));
if (!dataonly) {
pix2loc(hv, &picres, x, y);
printf("%7d %7d ",
(int)(hv[0]*picres.xr),
(int)(hv[1]*picres.yr));
}
if ((*putval)(scanln[x]) < 0) {
fprintf(stderr, "%s: write error\n",
progname);
quit(1);
}
}
}
}
free((void *)scanln);
}