--- ray/src/rt/data.c	1989/09/12 12:26:14	1.3
+++ ray/src/rt/data.c	1994/05/13 13:05:13	2.9
@@ -1,4 +1,4 @@
-/* Copyright (c) 1986 Regents of the University of California */
+/* Copyright (c) 1993 Regents of the University of California */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ LBL";
@@ -14,46 +14,71 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  "color.h"
 
+#include  "resolu.h"
+
 #include  "data.h"
 
+				/* picture memory usage before warning */
+#ifndef PSIZWARN
+#ifdef BIGMEM
+#define PSIZWARN	3000000
+#else
+#define PSIZWARN	1000000
+#endif
+#endif
 
-extern char  *libpath;			/* library search path */
+#ifndef TABSIZ
+#define TABSIZ		97		/* table size (prime) */
+#endif
 
-static DATARRAY  *dlist = NULL;		/* data array list */
+#define hash(s)		(shash(s)%TABSIZ)
 
-static DATARRAY  *plist = NULL;		/* picture list */
 
+extern char  *fgetword();
 
+extern char  *getlibpath();		/* library search path */
+
+static DATARRAY	 *dtab[TABSIZ];		/* data array list */
+
+static DATARRAY	 *ptab[TABSIZ];		/* picture list */
+
+
 DATARRAY *
 getdata(dname)				/* get data array dname */
 char  *dname;
 {
+	char  word[64];
 	char  *dfname;
 	FILE  *fp;
 	int  asize;
-	register int  i;
+	register int  i, j;
 	register DATARRAY  *dp;
 						/* look for array in list */
-	for (dp = dlist; dp != NULL; dp = dp->next)
+	for (dp = dtab[hash(dname)]; dp != NULL; dp = dp->next)
 		if (!strcmp(dname, dp->name))
 			return(dp);		/* found! */
 
 	/*
 	 *	If we haven't loaded the data already, we will look
-	 *  for it in the directorys specified by the library path.
+	 *  for it in the directories specified by the library path.
 	 *
 	 *	The file has the following format:
 	 *
-	 *		#dimensions
+	 *		N
 	 *		beg0	end0	n0
 	 *		beg1	end1	n1
 	 *		. . .
+	 *		begN	endN	nN
 	 *		data, later dimensions changing faster
 	 *		. . .
 	 *
+	 *	For irregularly spaced points, the following can be
+	 *  substituted for begi endi ni:
+	 *
+	 *		0 0 ni p0i p1i .. pni
 	 */
 
-	if ((dfname = getpath(dname, libpath, R_OK)) == NULL) {
+	if ((dfname = getpath(dname, getlibpath(), R_OK)) == NULL) {
 		sprintf(errmsg, "cannot find data file \"%s\"", dname);
 		error(USER, errmsg);
 	}
@@ -67,31 +92,59 @@ char  *dname;
 		error(SYSTEM, errmsg);
 	}
 							/* get dimensions */
-	if (fscanf(fp, "%d", &dp->nd) != 1)
+	if (fgetword(word, sizeof(word), fp) == NULL || !isint(word))
 		goto scanerr;
-	if (dp->nd <= 0 || dp->nd > MAXDIM) {
+	dp->nd = atoi(word);
+	if (dp->nd <= 0 || dp->nd > MAXDDIM) {
 		sprintf(errmsg, "bad number of dimensions for \"%s\"", dname);
 		error(USER, errmsg);
 	}
 	asize = 1;
 	for (i = 0; i < dp->nd; i++) {
-		if (fscanf(fp, "%lf %lf %d",
-				&dp->dim[i].org, &dp->dim[i].siz,
-				&dp->dim[i].ne) != 3)
+		if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word))
 			goto scanerr;
-		dp->dim[i].siz -= dp->dim[i].org;
+		dp->dim[i].org = atof(word);
+		if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word))
+			goto scanerr;
+		dp->dim[i].siz = atof(word);
+		if (fgetword(word, sizeof(word), fp) == NULL || !isint(word))
+			goto scanerr;
+		dp->dim[i].ne = atoi(word);
+		if (dp->dim[i].ne < 2)
+			goto scanerr;
 		asize *= dp->dim[i].ne;
+		if ((dp->dim[i].siz -= dp->dim[i].org) == 0) {
+			dp->dim[i].p = (double *)malloc(dp->dim[i].ne*sizeof(double));
+			if (dp->dim[i].p == NULL)
+				goto memerr;
+			for (j = 0; j < dp->dim[i].ne; j++) {
+				if (fgetword(word, sizeof(word), fp) == NULL ||
+						!isflt(word))
+					goto scanerr;
+				dp->dim[i].p[j] = atof(word);
+			}
+			for (j = 1; j < dp->dim[i].ne-1; j++)
+				if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) !=
+					(dp->dim[i].p[j] < dp->dim[i].p[j+1]))
+					goto scanerr;
+			dp->dim[i].org = dp->dim[i].p[0];
+			dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1]
+						- dp->dim[i].p[0];
+		} else
+			dp->dim[i].p = NULL;
 	}
 	if ((dp->arr = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL)
 		goto memerr;
 	
-	for (i = 0; i < asize; i++)
-		if (fscanf(fp, DSCANF, &dp->arr[i]) != 1)
+	for (i = 0; i < asize; i++) {
+		if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word))
 			goto scanerr;
-	
+		dp->arr[i] = atof(word);
+	}
 	fclose(fp);
-	dp->next = dlist;
-	return(dlist = dp);
+	i = hash(dname);
+	dp->next = dtab[i];
+	return(dtab[i] = dp);
 
 memerr:
 	error(SYSTEM, "out of memory in getdata");
@@ -102,24 +155,36 @@ scanerr:
 }
 
 
+static
+headaspect(s, iap)			/* check string for aspect ratio */
+char  *s;
+double  *iap;
+{
+	if (isaspect(s))
+		*iap *= aspectval(s);
+}
+
+
 DATARRAY *
 getpict(pname)				/* get picture pname */
 char  *pname;
 {
-	extern char  *libpath;
+	double  inpaspect;
 	char  *pfname;
 	FILE  *fp;
 	COLOR  *scanin;
-	int  width, height;
-	int  x, y;
-	register int  i;
+	int  sl, ns;
+	RESOLU	inpres;
+	FLOAT  loc[2];
+	int  y;
+	register int  x, i;
 	register DATARRAY  *pp;
 						/* look for array in list */
-	for (pp = plist; pp != NULL; pp = pp->next)
+	for (pp = ptab[hash(pname)]; pp != NULL; pp = pp->next)
 		if (!strcmp(pname, pp->name))
 			return(pp);		/* found! */
 
-	if ((pfname = getpath(pname, libpath, R_OK)) == NULL) {
+	if ((pfname = getpath(pname, getlibpath(), R_OK)) == NULL) {
 		sprintf(errmsg, "cannot find picture file \"%s\"", pname);
 		error(USER, errmsg);
 	}
@@ -134,43 +199,68 @@ char  *pname;
 		sprintf(errmsg, "cannot open picture file \"%s\"", pfname);
 		error(SYSTEM, errmsg);
 	}
+#ifdef MSDOS
+	setmode(fileno(fp), O_BINARY);
+#endif
 						/* get dimensions */
-	getheader(fp, NULL);
-	if (fgetresolu(&width, &height, fp) != (YMAJOR|YDECR))
+	inpaspect = 1.0;
+	getheader(fp, headaspect, &inpaspect);
+	if (!fgetsresolu(&inpres, fp))
 		goto readerr;
+#if PSIZWARN
+						/* check memory usage */
+	i = 3*sizeof(DATATYPE)*inpres.xr*inpres.yr;
+	if (i > PSIZWARN) {
+		sprintf(errmsg, "picture file \"%s\" using %d bytes of memory",
+				pname, i);
+		error(WARNING, errmsg);
+	}
+#endif
 	for (i = 0; i < 3; i++) {
 		pp[i].nd = 2;
-		pp[i].dim[0].ne = width;
-		pp[i].dim[1].ne = height;
+		pp[i].dim[0].ne = inpres.yr;
+		pp[i].dim[1].ne = inpres.xr;
 		pp[i].dim[0].org =
 		pp[i].dim[1].org = 0.0;
-		if (width <= height) {
-			pp[i].dim[0].siz = 1.0;
-			pp[i].dim[1].siz = (double)height/width;
-		} else {
-			pp[i].dim[0].siz = (double)width/height;
+		if (inpres.xr <= inpres.yr*inpaspect) {
+			pp[i].dim[0].siz = inpaspect *
+						(double)inpres.yr/inpres.xr;
 			pp[i].dim[1].siz = 1.0;
+		} else {
+			pp[i].dim[0].siz = 1.0;
+			pp[i].dim[1].siz = (double)inpres.xr/inpres.yr /
+						inpaspect;
 		}
-		pp[i].arr = (DATATYPE *)malloc(width*height*sizeof(DATATYPE));
+		pp[i].dim[0].p = pp[i].dim[1].p = NULL;
+		pp[i].arr = (DATATYPE *)
+				malloc(inpres.xr*inpres.yr*sizeof(DATATYPE));
 		if (pp[i].arr == NULL)
 			goto memerr;
 	}
 							/* load picture */
-	if ((scanin = (COLOR *)malloc(width*sizeof(COLOR))) == NULL)
+	sl = scanlen(&inpres);
+	ns = numscans(&inpres);
+	if ((scanin = (COLOR *)malloc(sl*sizeof(COLOR))) == NULL)
 		goto memerr;
-	for (y = height-1; y >= 0; y--) {
-		if (freadscan(scanin, width, fp) < 0)
+	for (y = 0; y < ns; y++) {
+		if (freadscan(scanin, sl, fp) < 0)
 			goto readerr;
-		for (x = 0; x < width; x++)
-			for (i = 0; i < 3; i++)
-				pp[i].arr[x*height+y] = colval(scanin[x],i);
+		for (x = 0; x < sl; x++) {
+			pix2loc(loc, &inpres, x, y);
+			i = (int)(loc[1]*inpres.yr)*inpres.xr +
+					(int)(loc[0]*inpres.xr);
+			pp[0].arr[i] = colval(scanin[x],RED);
+			pp[1].arr[i] = colval(scanin[x],GRN);
+			pp[2].arr[i] = colval(scanin[x],BLU);
+		}
 	}
 	free((char *)scanin);
 	fclose(fp);
+	i = hash(pname);
 	pp[0].next =
 	pp[1].next =
-	pp[2].next = plist;
-	return(plist = pp);
+	pp[2].next = ptab[i];
+	return(ptab[i] = pp);
 
 memerr:
 	error(SYSTEM, "out of memory in getpict");
@@ -183,71 +273,114 @@ readerr:
 freedata(dname)			/* free memory associated with dname */
 char  *dname;
 {
+	DATARRAY  head;
+	int  hval, nents;
 	register DATARRAY  *dp, *dpl;
+	register int  i;
 
-	for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next)
-		if (!strcmp(dname, dp->name)) {
-			if (dpl == NULL)
-				dlist = dp->next;
-			else
+	if (dname == NULL) {			/* free all if NULL */
+		hval = 0; nents = TABSIZ;
+	} else {
+		hval = hash(dname); nents = 1;
+	}
+	while (nents--) {
+		head.next = dtab[hval];
+		dpl = &head;
+		while ((dp = dpl->next) != NULL)
+			if (dname == NULL || !strcmp(dname, dp->name)) {
 				dpl->next = dp->next;
-			free((char *)dp->arr);
-			freestr(dp->name);
-			free((char *)dp);
-			return;
-		}
+				free((char *)dp->arr);
+				for (i = 0; i < dp->nd; i++)
+					if (dp->dim[i].p != NULL)
+						free((char *)dp->dim[i].p);
+				freestr(dp->name);
+				free((char *)dp);
+			} else
+				dpl = dp;
+		dtab[hval++] = head.next;
+	}
 }
 
 
 freepict(pname)			/* free memory associated with pname */
 char  *pname;
 {
+	DATARRAY  head;
+	int  hval, nents;
 	register DATARRAY  *pp, *ppl;
 
-	for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next)
-		if (!strcmp(pname, pp->name)) {
-			if (ppl == NULL)
-				plist = pp->next;
-			else
+	if (pname == NULL) {			/* free all if NULL */
+		hval = 0; nents = TABSIZ;
+	} else {
+		hval = hash(pname); nents = 1;
+	}
+	while (nents--) {
+		head.next = ptab[hval];
+		ppl = &head;
+		while ((pp = ppl->next) != NULL)
+			if (pname == NULL || !strcmp(pname, pp->name)) {
 				ppl->next = pp->next;
-			free((char *)pp[0].arr);
-			free((char *)pp[1].arr);
-			free((char *)pp[2].arr);
-			freestr(pp[0].name);
-			free((char *)pp);
-			return;
-		}
+				free((char *)pp[0].arr);
+				free((char *)pp[1].arr);
+				free((char *)pp[2].arr);
+				freestr(pp[0].name);
+				free((char *)pp);
+			} else
+				ppl = pp;
+		ptab[hval++] = head.next;
+	}
 }
 
 
 double
 datavalue(dp, pt)		/* interpolate data value at a point */
 register DATARRAY  *dp;
-double  *pt;
+double	*pt;
 {
 	DATARRAY  sd;
 	int  asize;
+	int  lower, upper;
 	register int  i;
-	double  x, y, y0, y1;
-
+	double	x, y0, y1;
+					/* set up dimensions for recursion */
 	sd.nd = dp->nd - 1;
 	asize = 1;
 	for (i = 0; i < sd.nd; i++) {
 		sd.dim[i].org = dp->dim[i+1].org;
 		sd.dim[i].siz = dp->dim[i+1].siz;
+		sd.dim[i].p = dp->dim[i+1].p;
 		asize *= sd.dim[i].ne = dp->dim[i+1].ne;
 	}
-
-	x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz;
-
-	x *= dp->dim[0].ne - 1;
-
-	i = x;
-	if (i < 0)
-		i = 0;
-	else if (i > dp->dim[0].ne - 2)
-		i = dp->dim[0].ne - 2;
-
+					/* get independent variable */
+	if (dp->dim[0].p == NULL) {		/* evenly spaced points */
+		x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz;
+		x *= (double)(dp->dim[0].ne - 1);
+		i = x;
+		if (i < 0)
+			i = 0;
+		else if (i > dp->dim[0].ne - 2)
+			i = dp->dim[0].ne - 2;
+	} else {				/* unevenly spaced points */
+		if (dp->dim[0].siz > 0.0) {
+			lower = 0;
+			upper = dp->dim[0].ne;
+		} else {
+			lower = dp->dim[0].ne;
+			upper = 0;
+		}
+		do {
+			i = (lower + upper) >> 1;
+			if (pt[0] >= dp->dim[0].p[i])
+				lower = i;
+			else
+				upper = i;
+		} while (i != (lower + upper) >> 1);
+		if (i > dp->dim[0].ne - 2)
+			i = dp->dim[0].ne - 2;
+		x = i + (pt[0] - dp->dim[0].p[i]) /
+				(dp->dim[0].p[i+1] - dp->dim[0].p[i]);
+	}
+					/* get dependent variable */
 	if (dp->nd == 1) {
 		y0 = dp->arr[i];
 		y1 = dp->arr[i+1];
@@ -257,17 +390,15 @@ double  *pt;
 		sd.arr = &dp->arr[(i+1)*asize];
 		y1 = datavalue(&sd, pt+1);
 	}
-
 	/*
 	 * Extrapolate as far as one division, then
 	 * taper off harmonically to zero.
 	 */
 	if (x > i+2)
-		y = (2*y1-y0)/(x-i-1);
-	else if (x < i-1)
-		y = (2*y0-y1)/(i-x);
-	else
-		y = y0*((i+1)-x) + y1*(x-i);
+		return( (2*y1-y0)/(x-(i-1)) );
 
-	return(y);
+	if (x < i-1)
+		return( (2*y0-y1)/(i-x) );
+
+	return( y0*((i+1)-x) + y1*(x-i) );
 }